JP2522943Y2 - Concrete slab reinforcement structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete slab reinforcement structure used when a concrete slab used for a highway bridge or the like is deteriorated.

[0002]

2. Description of the Related Art When a concrete slab used for a highway bridge or the like has deteriorated over time, a reinforcing girder is attached to the back of the concrete slab in the middle of a main girder supporting the concrete slab. Is installed so that the strength of the concrete slab does not decrease.

However, when the concrete slab further deteriorates, cracks occur on the back surface of the concrete slab, and the concrete slab comes off.

Conventionally, in order to prevent the concrete slab from deteriorating and the concrete on the back side from falling off, conventionally, a steel plate is provided between the main girder and the reinforcing girder and between the reinforcing girders on the back side of the concrete slab. Attach, between these steel plate and the back of the concrete floor slab, fill the epoxy resin, glue the steel plate and the concrete floor slab,
The back of the concrete slab was prevented from falling off.

[0005]

However, in such a steel plate bonding structure, it is difficult to fill an epoxy resin between the steel plate and the concrete slab after the steel plate is attached, which makes the construction difficult. And there was no connection with the steel girder supporting the concrete floor slab, so there was the danger that someday the adhesive would break and break apart. For this reason, it was not possible to completely prevent the concrete slab from falling off even after reinforcement. In addition, in the case of floor slabs in which the deterioration of concrete has progressed, there was a disadvantage that the adhesion was immediately peeled off and there was no reinforcing effect.

[0006] The present invention eliminates such conventional disadvantages,
This provides an effective reinforcing structure even for floor slabs in which concrete has deteriorated.

[0007]

The reinforcing structure of the concrete slab of the present invention is a lightweight aggregate in which one surface is in close contact with the slab and the other surface is inflated at the center on the back surface of the concrete slab. Mounting the molded body, wrapping the surface of the molded body with a string or a band-like reinforcing fiber, and connecting the reinforcing fiber to a steel girder supporting a concrete floor slab. .

[0008]

[Function] The load of a vehicle or the like acting on the concrete slab is directly transmitted to the lightweight aggregate-containing molded body attached under the concrete slab. Since the center of the lightweight aggregate-containing molded body is inflated, a tensile force acts as a membrane force on the reinforcing fibers on the surface of the lightweight aggregate-containing molded body. The tensile force of the reinforcing fibers is transmitted to the steel girders supporting the concrete slab. In this way, the load acting on the concrete slab is transmitted to the girder. Since the lightweight aggregate containing the expanded material at the center and the reinforcing fibers mainly share the load transmission, there is no fear of falling off even if the concrete slab is deteriorated.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a concrete slab 1 to which a reinforcing structure according to the present invention is attached, 2 is a main girder (steel girder) supporting the concrete slab 1, and 3 is a concrete slab for reinforcement. 1 is a reinforcing girder (steel girder) attached later to the back surface of 1. Both ends of the reinforcing fiber 4 are fixed to the upper flanges 5 of the main girder 2 and the reinforcing girder 3 along the back surface of the concrete slab 1, and styrofoam is provided between the reinforcing fiber 4 and the back surface of the concrete slab 1. A lightweight aggregate-containing molded body 6 is installed. Since the lightweight aggregate-containing molded body 6 is light in weight despite its bulk and can withstand compression, it is possible to prevent the cracked portion of the back surface of the concrete floor slab 1 from falling off while in contact with the back surface of the concrete floor slab 1. Can be prevented.

The lightweight aggregate-containing molded body 6 has a planar shape in which the upper surface is in close contact with the back surface of the concrete floor slab 1 and has a shape in which the lower center is expanded.

The procedure of the construction will be described. As shown in FIG. 2, a hole 12 is made in the floor slab 1 and a concrete anchor bolt 8 is inserted.

On the other hand, as shown in FIG. 3, a lightweight aggregate-containing molded body 6 having a hole 13 through which the concrete anchor bolt 8 can pass is manufactured. This molded body with lightweight aggregate 6
Is a lightweight aggregate such as styrofoam, perlite, or foamed glass beads, epoxy resin, acrylic resin,
Hardened with cement mortar, etc., it is light and has strong resistance to compression.

An adhesive 10 is provided on the upper surface of the lightweight aggregate-containing molded body 6.
And attach it to the lower surface of the concrete slab 1. The lightweight aggregate-containing molded body 6 is fixed with concrete anchor bolts 8 so as not to fall.

Next, as shown in FIG. 4, a gap filler 7 such as epoxy mortar is filled into the gap between the lightweight aggregate-containing molded body 6 and the upper flange 5 from below.

Next, as shown in FIG. 5, the stud bolts 9 of the upper flange 5 are joined with the reinforcing fibers 4 so as to be knitted. As shown in FIG. 8, the reinforcing fiber 4 is a tape-shaped fiber woven from glass fiber or a rope-shaped fiber woven from carbon fiber. Since these reinforcing fibers 4 are light, do not rust, and have the property of withstanding tensile force, they are suitable for reinforcing concrete floor slabs that do not want to increase in weight and are concerned about water leakage.

FIG. 5 shows a state in which the stud bolts 9 are joined by the reinforcing fibers 4 so as to knit. FIG. 6 is a view of the reinforcing portion viewed from below. FIG. 7 shows a state in which the reinforcing fiber 4 is wound around the stud bottle 9. It is fixed with a washer 14 and a nut 15 so that the reinforcing fiber 4 does not fall.

[0018]

[Effect of the Invention] As described above, in the present invention, the lightweight aggregate-containing molded body is attached to the back surface of the concrete floor slab, and the lightweight aggregate-containing molded body is tied to the steel girder with the reinforcing fiber. Excellent effects such as easiness of construction and versatility that the existing girder can be freely constructed even if it is not as designed can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a side view showing a mounted state of a lightweight aggregate-containing molded body.

FIG. 3 is a perspective view of a lightweight aggregate-containing molded body.

FIG. 4 is a side view showing a state in which a gap filling material is filled in the structure of FIG. 2;

FIG. 5 is a side view showing a state in which reinforcing fibers are attached in the structure of FIG.

FIG. 6 is a bottom view as seen from a VI-VI direction in FIG. 5;

FIG. 7 is an enlarged side view of a fixing portion of the reinforcing fiber of FIG.

FIG. 8 is a plan view showing an example of a reinforcing fiber.

[Explanation of Signs] 1 Concrete floor slab 2 Main girder (steel girder) 3 Reinforcement girder (steel girder) 4 Reinforcement fiber 6 Lightweight aggregated molded body

Claims (1)

(57) [Scope of request for utility model registration] 1. A lightweight aggregate-containing molded product having one surface in close contact with the floor slab and the other surface inflated at the center is attached to the back surface of the concrete slab. A reinforcing structure for a concrete slab, characterized in that it is wrapped with reinforcing fibers and the reinforcing fibers are connected to a steel girder supporting the concrete slab.