JPS636681B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a girder joining method suitable for repairing deck slabs of bridge structures such as bridges and elevated roads.

Generally, structures such as bridges develop defects such as cracks in the floor slabs as the years pass and require repair. Methods for repairing these defective areas include replacing the floor slab, gluing a steel plate to the bottom of the floor slab, and dismantling the defective area of the floor slab and replacing it with a new panel slab.

The method of replacing floor slabs involves the hassle of traffic regulations, and requires early release. Some methods of gluing steel plates to the underside of the deck slab are highly effective, but it is not possible to visually observe changes in the underside of the deck over time. In the method of replacing panels, there is always a problem of how to deal with the support girder. Each support girder has different deflection characteristics, and the displacement becomes an additional stress on the slab, which is cumulatively added to the loading stress, exposing the slab to harsh conditions.

The present invention fully understands these drawbacks of the conventional technology, and
The objective is to provide panels and composite floor slabs in which a visible panel on the underside of the floor slab is made in advance, and problems with girder connections can be solved by post-processing.

More specifically, the first point is to provide a panel that can be reinforced with small beams and made in advance.
The second point is to provide a composite floor slab using this panel, and the third point is to provide a girder joint connection method that can prevent or absorb horizontal and vertical vibrations.

Next, embodiments of the present invention will be described based on the drawings.

As shown in Fig. 1, the panel 1 is made of a concrete plate 2 of a certain size divided into floor slabs, and has a channel shape (U-shape) having a length in the width direction of the plate 2 in the width direction of the lower surface thereof. Small beam 3 made of steel material
It is formed by having part 3a of the small beam 3 protrude and part 3b buried. The width direction of the concrete plate body 2 and the length direction of the small beam 3 are also the width directions of the divided bridge deck slabs.

The connecting part between the panel 1 and the girder is formed by cutting out the protruding part 3a of the small beam 3, but it is better to leave a part of it without cutting until it touches the bottom surface of the concrete plate 2, as will be described later. Preferred in the examples.

Figure 2 shows another embodiment of the panel 1, in which a corbel 2b is provided on the lower surface of the concrete plate 2 with a wide margin, and a small beam 3 is installed only in the corbel 2b portion as shown in Figure 1. As in the example, a panel 1 is shown in which a portion 3a is protruded and a portion 3b is buried. 1st
In the figures and FIG. 2, reference numeral 2a denotes a cutout portion corresponding to the width of known on-site concrete pouring, which is provided as necessary.

The reason why the small beam 3 is made into a channel shape is to make it easier to connect the girder to the protruding part 3a of the small beam 3, which will be described later. There is no problem even if it is made of shaped steel.

This panel 1 can be made in advance before receiving an order for repairing deck slabs of bridges, etc. Small beam 3 also serves as a concrete plate and reinforcement steel.

When repairing the floor slab, as shown in Figure 3, the defective part B of the floor slab A is dismantled, the girder 4 is exposed, and the
Place the panel in the state shown in the figure. Before mounting the panel 1 and the girder 4, measure the spacing between the girders in the repaired area in advance, and cut the protruding part 3a of the small beam 3 of the panel 1 at the point corresponding to the girder 4 position using gas cutting or the like. It is formed by providing a notch and a recess 5. As shown in FIG. 6, this recessed portion 5 is formed leaving a biting portion 3c.

The panel 1 is placed on the floor slab dismantling section B by placing an adhesive material such as resin, resin mortar, cement, etc. on the upper surface of the flange 4a of the girder 4 as shown in FIG.
The cutout recess 5 of the protruding part 3a of the small beam 3 of the panel 1 is fitted so that the small beam 3 intersects the girder 4, and the biting part 3c is bitten into the adhesive 6. In the figure, 7 is a formwork used to heave up the adhesive. End of girder flange 4a and protrusion 3 of small beam 3
If there is a gap between the notch recess 5 and the wall surface 5a, a slip-preventing member 8 such as a spring or wedge is inserted.

The one shown in Fig. 5 shows an embodiment using a panel 1 in which a corbel 2b is provided on the back side of a concrete plate body 2. The difference from the embodiment shown in FIG. 4 lies in that the protrusion 3a of the buried small beam 3 is cut out. If this haunch 2b is formed wide and the length of the small beam 3 is made to match this, even if there is a difference in spacing between beams, it will not affect the machining notch after the protrusion 3a of the small beam 3.

In addition, the girder flange 4a and the small beam 3 on the lower surface of the panel 1
The resilient body 9, such as a leaf spring, which connects the two will be described later with reference to FIG.

Forming a digit match in this manner has approximately the following effects.

Compared to composite floor slabs, which use a steel plate as the bottom plate and attach dowels to it and combine it with concrete, panel composites with only small beams embedded in concrete can be visually inspected from the bottom of the slab.

Normally, the connections between the panels and the girders are cast on-site, but with this panel, the embedded small beams are processed in a factory so that the girders can be connected at the bottom of the panel, which can be made in advance and contributes to labor savings.

Since the remaining small beam notch on the lower surface of the concrete connected to the girder flange has a slab-stopping effect, an effect similar to that of slab-stop welding with the girder flange can be expected.

A biting part can be left in the notch concave part of the protruding part of the small beam, and this can be bited into the adhesive material, and the structure allows slip-preventing material to be inserted into the gap, so it is possible to prevent the slab from moving by a vehicle. Effective against horizontal vibrations such as one-sided flow and sideways vibration.

Next, based on FIG. 7, the match for receiving digits will be further explained.

This mechanism is based on the floor slab A that has been described so far.
The floor slab is disassembled to expose the girder 4.The floor slab is divided into a concrete plate 2 formed into an arbitrary size and has a constant length in the width direction of the concrete plate 2. A panel 1 with a small beam 3 buried so that a part 3a protrudes is cut out so that it can be fitted to the flange 4a of the exposed girder 4 of the demolished floor slab part B with the girder 4 and the small beam 3 intersecting. While fitting the notch recess 5 and the flange 4a of the girder 4,
This is a further development of the engagement in which the lower surface of the panel 1 and the upper surface of the flange 4a of the girder 4 are glued together and a slip prevention material 8 is applied. 9 to press against each other, insert the elastic body 9 on the side of the beam 3, and fix it to the flange 3d of the beam 3 using, for example, a fastening bolt 10 as shown in FIG. The agreement was concluded. Note that fastening to the small beam is not necessarily limited to flanges.

In addition to the above-mentioned effects, this type of fastening has the effect of preventing damage to the floorboards due to the added stress caused by the sinking of the fulcrum. In other words, a part of the small beam of the panel bites into the adhesive material such as resin mortar or concrete on the support girder, and this contact point is fastened by a spring acting as an elastic body, which reduces the horizontal vibration of the floor slab, vertical vibration, and the vibration of the fulcrum. The added stress caused by uneven settlement is absorbed by the deformation of the connected springs, which has the effect of protecting the deck from damage.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the panel, Fig. 2 is a perspective view showing another embodiment of the panel, Fig. 3 is an explanatory perspective view with a part of the floor slab disassembled, and Fig. 4 is the same as shown in Fig. 1. Fig. 5 is an explanatory perspective view of the panel shown in Fig. 2 installed in a partially cut-out part of the floor slab shown in Fig. 3, and Fig. 5 is a partially disassembled part of the floor slab shown in Fig. 3. 6 is a cross-sectional view illustrating the joint between the panel and the girder, and FIG. 7 is an explanatory perspective view of the structure installed on the flange of the small beam as shown in FIG. 8. An explanatory diagram showing one end of the body fixed, and the girder flange and the small beam are fastened at the girder connection part shown in Fig. 6, and Fig. 8 is a sectional view showing the place where the small beam flange is equipped with a fastening bolt. be. In the drawing, 1 is a panel, 2 is a concrete plate, 2b is a corbel, 3 is a small beam, 3a is a protrusion,
3b is a buried part, 4 is a girder, 4a is a flange, 5 is a concave part for joining with the girder, 6 is an adhesive, 8 is a stopper material, 9 is an elastic body, A is a floor slab, and B is a floor slab dismantled part. .

Claims (1)

[Claims] 1 A small concrete plate with a constant length in the width direction of the concrete plate on the lower surface of the concrete plate formed into an arbitrary size by dividing the floor plate into the dismantled part of the slab where the floor slab is dismantled and the girders are exposed. The panel was buried so that a part of the beam protruded, and the protruding part of the small beam corresponding to the exposed girder position of the demolished floor slab was cut out so that it could be fitted to the flange of the girder with the girder and the small beam intersecting. The notch and the flange of the girder are fitted and placed, and the lower surface of the panel and the upper surface of the girder flange are fitted, and the space between the end of the girder flange at the mating point and the notch wall surface of the small beam protrusion is A method for joining girder joints, characterized in that a slip-preventing material is applied to the panels, and the flanges near the joints of the panels and the girders are fastened to the protruding parts of the small beams using elastic bodies.