JPS6233767Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a protection member for protecting the surface of a concrete structure such as a drop, an erosion control dam, a weir, a water gate, a dam, etc.

Concrete structures built on rivers, especially the surfaces that come into contact with river water, are easily abraded by earth and sand washed away with the flowing water.

In order to protect the surface of this concrete structure, for example, as shown in FIG.
2 had the abrasion-resistant sheet 03 stretched without any gaps, but in areas where rock blocks 04 or driftwood fall and collide or roll, large stress is locally applied to the abrasion-resistant sheet 03 due to the impact energy. After a certain period of time, the abrasion-resistant sheet 03 becomes tattered, and the impact force acts directly on the concrete structure 01.
In some cases, the structure itself was damaged.

The present invention relates to an improvement of a protective member for river concrete structures that eliminates such drawbacks, and includes an abrasion-resistant flexible cover that is attached to the surface of a river concrete structure, and an elastic cushion provided on the inner surface of the cover. The purpose is to provide a highly durable protective member that can sufficiently protect river concrete structures.

In the present invention, an elastic cushion material is provided on the inner surface of the abrasion-resistant flexible cover that is attached to the surface of the river concrete structure, so that stones, driftwood, etc. that move with river water do not collide with the surface of the river concrete structure. Even when the impact force is applied to the abrasion-resistant flexible cover and the concrete structure, the elastic cushion material elastically deforms and absorbs the impact energy, thereby greatly reducing the impact force applied to the abrasion-resistant flexible cover and the concrete structure. As a result, damage to the concrete structure is prevented and the durability of the wear-resistant flexible cover is improved.

Further, in the present invention, since the river concrete structure and the elastic cushion material are covered with the abrasion-resistant flexible cover, the concrete structure and the elastic cushion material are protected against dirt and sand floating in the flowing water. Abrasion is reduced and the durability of these concrete structures and elastic cushion materials is increased.

An embodiment of the present invention illustrated in FIG. 2 will be described below.

1 is a concrete river bed in drop works, etc.
Anchor bolts 2 are placed at predetermined intervals vertically and horizontally on the same river bed 1.
is buried.

Further, a rubber belt 3 (which may be reinforced with fibers like a tire) serving as an abrasion-resistant flexible cover is installed in the river width direction, and the rubber belt 3 is installed so that the upstream edge of the downstream rubber belt 3 is covered with the upstream rubber belt 3. 3
The upstream edge of is fixed with the anchor bolt 2.

Further, on the lower surface of the rubber belt 3, an elastic cushion material 4 made of polyethylene foam 5 times the required thickness is integrally adhered.

Furthermore, the downstream edge 5 of the rubber belt 3 is adhered to the upper surface of the downstream rubber belt 3.

Since the embodiment shown in FIG. 2 is configured as described above, when the stone block 6 falls with a required head as shown in FIG. It collides with the river bed with equal kinetic energy, but the kinetic energy is absorbed by the elastic cushion material 4.

Therefore, even if the sharp corner of the stone block 6 collides with the rubber belt 3, no large local stress is applied to the rubber belt 3, and the rubber belt 3 is neither cut nor seriously damaged. do not have.

For example, on a rubber belt 3 with a thickness of 2 cm on which the elastic cushion material 4 is not dotted, at a height of 20 cm, 500
When a stone block 6 of kg is dropped, the same rubber belt 3
was cut, but the elastic cushion material 4 with a thickness of 10 cm was cut.
If a rubber belt 3 with a thickness of 2 cm is pasted, even if the same block of stone 6 is dropped at a height of 50 cm or less, the rubber belt 3 will not break and the elastic cushion material 4 will fall by 20 cm.
In the case of a thickness of , the rubber belt 3 will not be cut if the head is less than 80 cm.

In addition, the concrete river bed 1 and the elastic cushion material 4 are covered with the rubber belt 3 and are not exposed to running water, so the stone blocks 6 slide on the rubber belt 3.
Even if the earth and sand rub against the rubber belt 3 during rolling, the river bed 1 and the elastic cushion material 4 are not worn away.

Furthermore, since the downstream edge 5 of the rubber belt 3 is bonded to the surface of the downstream side rubber belt 3, even if the water flow locally backflows, the rubber belt 3
The cushion material does not peel off and is elastic.
The elastic cushion material 4 prevents dirt, gravel, etc. from entering the
The elasticity of the material is not impaired.

The present invention can also be constructed as shown in FIGS. 3 and 4.

A round shaped lightweight steel 7 is buried in a concrete riverbed 1 and is integrally tied to an anchor bolt 2.

Further, as shown in FIG. 4, locking protrusions 10 are formed inward on both side edges of the channel-like rubber cover 9, and a foamed elastic cushion material 4 is formed in the cover 9.
The locking protrusion 10 is inserted into and engaged with the groove 8 of the round-shaped lightweight steel 7, and the channel-shaped rubber cover 9 is laid on the concrete riverbed 1 without any gaps.

In this case, the channel-like rubber cover 9 may extend in the width direction of the river or in the flow direction.

In the embodiment shown in FIGS. 3 and 4, not only the elasticity of the foam elastic cushion material 4 but also the elasticity of the channel-shaped rubber cover 9 can contribute to absorbing the impact force of the stone block 6 etc. Therefore, the cushioning properties of the protective member are further improved.

Further, since the locking protrusion 10 is adapted to be engaged with the groove 8 of the round-shaped lightweight steel 7, the cover 9 can be attached and detached very easily.

Furthermore, as shown in FIGS. 5 and 6, both side edges of the channel-shaped rubber cover 11 are bent outward at right angles, and the anchor bolts 2 are fitted into the holes 13 of the bent portions 12 from the downstream side. However, it may be tightened with a nut 14, and in such an embodiment, the cover 11 can be more firmly fixed to the concrete river bed 1.

Furthermore, as shown in FIGS. 7 to 9,
A hole 16 is provided on one side of the cover 15 which is curved into a substantially U-shape.
With the curved part facing upstream, the hole 16 is fitted into the anchor bolt 19 buried in the concrete riverbed 18 of the drop work, and the bolt 19
The nut 20 may be screwed and tightened. Although a foam elastic cushion material 17 is integrally attached to the inner surface of the cover 15, the cushion material 17 may not be necessary depending on the design.

Further, although the U-shaped curved cover 15 is laid facing in the river width direction, the cover 15 may be laid diagonally or in a staggered manner.

Furthermore, the U-shaped curved covers 15 may be laid side by side without any gaps, or they may be laid at predetermined intervals as shown in FIG. It becomes the appropriate roughness,
Since the flow velocity at the bottom of the river bed 18 is reduced, the length of the apron of the drop structure can be shortened.

Furthermore, since the head of the anchor bolt 19 and the nut 20 are not exposed to the flow, damage to these parts is also prevented.

In the above embodiment, the cushion members 4 and 17 were both made of expanded polyethylene foam, but they may also be made of rubber foam, or they may be made of an elastic hollow tube 21 or an elastic honeycomb body 22 as shown in FIG. But that's fine.

Furthermore, the covers 3, 9, 11, 15 may be made of flexible synthetic resin instead of rubber.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional side view of a river concrete structure equipped with a conventional protection member, Fig. 2 is a cross-sectional side view of a protection member for a river concrete structure according to the present invention, and Fig. 3 is an example of another embodiment. Partial cutaway perspective view, No. 4
The figure is a perspective view of the main part of the same embodiment, FIG. 5 is a cross-sectional side view of another embodiment, and FIG. 6 is a perspective view of the main part.
Fig. 7 is a cross-sectional side view of still another embodiment of the present invention, Fig. 8 is a perspective view of the main part thereof, Fig. 9 is an enlarged cross-sectional side view of the main part of Fig. 7, and Figs. 10 and 11 are FIG. 7 is a perspective view illustrating other modified examples of the cushion material of the present invention. 1... Concrete river bed, 2... Anchor bolt, 3... Rubber belt, 4... Polyethylene foam, 5... Downstream edge, 6... Stone block, 7... Round-shaped lightweight steel, 8... Groove, 9... Channel-shaped rubber cover, 10... Locking protrusion, 11... Channel-shaped rubber cover, 12... Bent portion, 13... Hole, 1
4...Natsuto, 15...U-shaped cover, 16...
Hole, 17... Foam elastic cushion material, 18...
Concrete river bed, 19...anchor bolt,
20... Nut, 21... Elastic hollow tube cushion material, 22... Elastic honeycomb cushion material.

Claims (1)

[Scope of utility model registration request] A protection member for a river concrete structure, comprising an abrasion-resistant flexible cover attached to the surface of the river concrete structure, and an elastic cushion material provided on the inner surface of the cover.