JPH0784758B2 - Drainage structure of asphalt pavement concrete slab - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a drainage structure of an asphalt pavement concrete structure such as a road bridge such as an elevated road, a bridge, and the like. It also relates to a drainage structure that can efficiently drain the water that has permeated the pavement.

[Conventional technology]

In a road bridge such as an elevated road and a bridge, the drainage structure for draining rainwater etc. that has fallen on the road surface is provided with an L-shaped gutter and drainage basin on the side of the road surface, and only the water flowing on the road surface is drained from the upper surface of the drainage basin. It is designed to be able to flow into the drainage basin through the inflow hole of the lid.

[Problems to be solved by the invention]

The drainage basin of the above conventional road bridge collects and drains only the water flowing on the road surface, but in the reinforced concrete floor slab with the asphalt pavement surface, the asphalt on the pavement surface is quite porous and slightly permeable. Therefore, some of the rainwater penetrates into the pavement asphalt layer. The rainwater that has penetrated into the asphalt layer further penetrates into the concrete floor slab, and the permeated water not only corrodes the reinforcing bars and steel materials inside the concrete floor slab, but also deteriorates the concrete.
In particular, the deterioration of the slab concrete under repeated load is accelerated. As a result, there is a possibility that the load bearing capacity and durability of the floor slab will be extremely seriously affected.

Therefore, the present invention provides a novel drainage structure that can drain not only the water flowing on the road surface but also the water that has permeated the asphalt of the pavement surface and prevent the permeated water from further permeating the reinforced concrete floor slab. The purpose is to

[Means for solving problems]

In order to achieve the above object, the present inventor has conducted diligent research and as a result, provides a water-impermeable impermeable layer between the paved asphalt layer and the reinforced concrete of the floor slab below it, and a part of the asphalt layer above it. It was found that water that permeates the asphalt layer can be drained to the drainage basin through the water permeable layer by providing a water permeable layer that is more easily permeable to water than the asphalt layer and that communicates with the drainage basin. The invention was completed.

That is, the present invention is a structure in which asphalt pavement is laid on a reinforced concrete floor slab, and an impervious layer having low water permeability is provided at the interface between the pavement asphalt layer and the concrete floor slab, and the structure is opened on the upper surface of the structure. A position where a drainage basin having a lid having an inflow hole for allowing flowing water to flow in at the upper end and having a lower end connected to a drainage pipe is embedded in the upper surface of the structure, and which is in contact with the upper surface of the impermeable layer on the side surface of the drainage basin. An asphalt pavement concrete in which a water passage hole is provided in the concrete floor slab and a water passage layer made of a porous water permeable material which is in contact with the upper surface of the impermeable layer and communicates with the water passage hole is provided in a part of the concrete floor slab. The gist is the drainage structure of the floor slab.

Next, the contents of the present invention will be described in detail with reference to the drawings. 1 and 2 are a front sectional view and a plan view of an example of a road bridge having a drainage structure for an asphalt pavement concrete floor slab of the present invention, and FIGS. 3 and 4 are the same AA sectional view and BB sectional view. Is. In the drawing, (1) is a concrete floor slab,
The asphalt layer (2) is paved on it. A water impermeable layer (3) made of a water impermeable material such as water impermeable asphalt or synthetic resin is provided at the interface between the concrete floor slab (1) and the asphalt layer (2). (4) is a drainage basin,
A lid (6) made of cast iron or the like and having a grid-like or other water inflow hole (5) on the upper surface is fitted.

A water passage hole (7) is provided on a side surface of the drainage basin (4) at a position in contact with the upper surface of the impermeable layer (3), and the water passage hole (7) is contacted with the water passageway (7) so that the area around the drainage basin (4) is not contacted. A water permeable layer (8) made of a water permeable material such as water permeable asphalt is provided above the water permeable layer (3). Reference numeral (9) is a support frame (9) for protecting the water-permeable layer (8) against a load from above, and is constituted by a steel plate or the like in a grid shape, and the grid-shaped steel plate is used for water passage as appropriate. A notch (11) is provided.

The upper surface of the support frame (9) is covered with a covering plate (10) made of a steel plate, and the upper surface of the covering plate (10) is finished to be flush with the road surface.

As the water-permeable layer (8), use a water-permeable asphalt having a higher water permeability than the asphalt layer (2), a porous material composed of sand and a binder, a porous resin, or any other porous water-permeable material. You can

FIG. 5 is a perspective view in which a part of another embodiment of the drainage structure for an asphalt pavement concrete floor slab of the present invention is cut away. In the drainage structure of this embodiment, the water-permeable layer (8) is provided in an elongated continuous manner along the ground cover (12) at the side end of the road and communicates with the water-permeable layer (8) of the drainage basin (4). To do. As shown in the sectional view of FIG. 6, it is preferable to provide the elongated water-permeable layer (8) on the plane of the impermeable layer (3) for efficient water collection.

Further, as shown in FIG. 5, elongated water-permeable layers (13) are provided near the expansion joint at appropriate intervals in parallel with the width direction of the road, and each end of the water-permeable layers (13) is covered with a ground cover. Water that has penetrated into the asphalt layer (2) at the central portion of the road surface can quickly pass through the water passage layer (13) and the water passage layer (8) by communicating with the water passage layer (8) along (12), It can be collected in the drainage basin (4).

The elongated water-permeable layers (8) and (13) shown in FIG. 5 may be used together with the water-permeable layer (8) which surrounds the drainage basin (4) shown in FIGS. 4 may be used instead of the planar water-permeable layer (8).

When the impermeable layer (3) near the ground cover (12) is provided over the entire plane of the concrete floor slab (1), the water collecting performance is further improved.

The drainage structure of an asphalt pavement concrete slab of the present invention can be applied not only to road bridges but also to any asphalt-paved concrete structure.

[Action]

According to the drainage structure of the asphalt pavement concrete floor slab of the present invention, rainwater that has fallen on the asphalt pavement road permeates the asphalt layer (2) and flows along the slope of the concrete floor slab (1) to pass water. Enter the layer (13) and the aquifer (8). Since this water passage layer (8) is porous and rich in water permeability, water quickly flows along the water passage layer (8), and from the water passage hole (7) of the drainage basin (4) to the drainage basin (4). And then drained.

〔The invention's effect〕

According to the drainage structure of the asphalt pavement concrete floor slab of the present invention, the concrete floor slab (1) and the asphalt layer (2) penetrate into the asphalt layer (2) from the road surface of the road bridge.
The water that has reached the interface of No. 3 immediately flows into the drainage basin (4) through the water-permeable layer (8) and is drained and does not stay on the interface for a long time, so the permeated water into the concrete floor slab (1) is Can be kept to a minimum. As a result, it is possible to prevent corrosion of the reinforcing bars and steel materials in the concrete floor slab (1) and to prevent the load capacity and durability of the floor slab from decreasing.

In the conventional road surface drainage structure, the pavement area around the drainage basin is often damaged by vibration of heavy vehicles, but a water passage layer is provided around the drainage basin and covered with a covering plate such as a steel plate. If this is done, damage to this part will be eliminated and road maintenance will be easier.

[Brief description of drawings]

1 and 2 are a front sectional view and a plan view of an example of a drainage structure for an asphalt pavement concrete floor slab of the present invention, and FIGS. 3 and 4 are a sectional view taken along the line AA and a sectional view taken along the line BB. Fifth
FIG. 6 is a partially cutaway perspective view of another embodiment of the drainage structure for an asphalt pavement concrete floor slab of the present invention, and FIG. 6 is a sectional view of the same. (1) …… Concrete floor slab, (2) …… Asphalt layer, (3) …… Impermeable layer, (4) …… Drainage basin, (5)…
… Inflow hole, (6) …… Lid, (7) …… Water passage hole, (8),
(13) ... water flow layer, (9) ... support frame, (10) ... cover plate, (11) ... notch, (12) ... ground cover.

Claims (3)

[Claims] 1. A structure in which asphalt pavement is laid on a reinforced concrete floor slab, an impervious layer having low water permeability is provided at the interface between the pavement asphalt layer and the concrete floor slab, and the structure is opened on the upper surface of the structure. A position where a drainage basin having a lid having an inflow hole for allowing flowing water to flow in at the upper end and having a lower end connected to a drainage pipe is embedded in the upper surface of the structure, and which is in contact with the upper surface of the impermeable layer on the side surface of the drainage basin. And a water-permeable layer made of a porous water-permeable material that is in contact with the upper surface of the impermeable layer and communicates with the water-permeable hole. Drainage structure for asphalt pavement concrete slab. 2. The asphalt pavement according to claim 1, wherein the water-permeable layer is provided in place of the asphalt layer in a constant area surrounding the drainage basin, and a coating plate made of a steel plate or the like is coated on the water-permeable layer. Drainage structure of concrete floor slab. 3. The drainage structure for an asphalt pavement concrete floor slab according to claim 1 or 2, wherein the structure is a road bridge, and the water-permeable layer is elongated along the ground cover of the road side edge.