JPH0533544Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the support structure of safety fences installed on coastal breakwaters and embankments of rivers, ponds, etc. Especially during strong winds, waves, driftwood, etc. This invention relates to a support structure for a safety fence suitable for installation in a place where there is a possibility of receiving impact due to a collision.

[Prior art and problems to be solved by the invention] In particular, the support structure of a safety fence installed on a breakwater on the coast needs to be strong enough to withstand the pressure of waves that rush in during strong winds. It must also be able to withstand the impact of driftwood, gravel, pebbles, etc. carried by the waves. Furthermore, most breakwaters are generally gravity-type structures using caissons, which vibrate considerably when subjected to wave force, so the safety fence is also required to have a structure that can withstand the vibrations.

Typical conventional safety fence support structures include those shown in FIGS. 3 to 7, for example. That is, the support structure shown in FIG. 3 has the lower part of the support support 1 buried when concrete 2 is placed.

The support structure shown in Fig. 4 is made by drilling a hole 3 in concrete 2 that is slightly larger than the diameter of the support support 1, inserting the support support 1 into the hole, filling the bottom of the hole with sealing asphalt 4, and pouring sand 5 on top of it. Pack it tightly and seal the upper end of the hole with asphalt 6.

The strut structure shown in FIG. 5 has a flange 7 attached to the bottom of the strut 1 by, for example, welding.
Anchor bolt 8 embedded in concrete 2
and nuts 9. In addition, in each conventional example, 10 is a handrail member made of wire rope, chain, etc.

However, since the strut structure shown in Figure 3 has a rigid structure, there is almost no displacement when it receives an impact, and the amount of impact energy absorbed is extremely small. There is a drawback that when driftwood, gravel, etc. collide with each other, the support 1 may bend and the concrete 2 at the buried location may be easily damaged. In the support structure shown in Fig. 4, the sand 5 absorbs some energy and has the effect of preventing damage to concrete against relatively small impact forces, but in order to increase the amount of energy absorption, holes 3 When increasing the amount of sand 5 and putting in more sand 5, the pulling force of the support 1 becomes weaker. For this reason, there is a limit to how large the hole 3 can be, and therefore, as with the support structure shown in Figure 3, if a slightly large impact is applied, the support support 1 may bend or the embedded part of the support may be easily damaged. . The column structure shown in Fig. 5 has a rigid structure just like the column structure shown in Fig. 3, so it has the disadvantage that the column is easily bent and the anchor bolt 8 or the concrete where the anchor bolt is embedded is easily damaged when an impact is applied. be.

FIG. 6 is a sectional view showing a fourth example of a conventional safety fence support structure, in which the support structure 1 is attached to a flexible structure to eliminate the drawbacks of the support structure shown in FIGS. 3 to 5. That's what I was aiming for. In the figure, reference numeral 1 denotes a column, the lower part of which is inserted into a metal cylindrical part 11 having an inner diameter larger than its outer diameter, and a rubber material 12 for shock absorption is placed between the column 1 and the cylindrical part 11. Filled. A mounting flange 13 is attached to the upper end of the cylindrical portion 11 by welding or the like.

This support structure is installed by, for example, burying the metal cylindrical portion 11 and the mounting anchor bolts 8 during pouring of the concrete 2, and fixing the mounting flange 13 with the anchor bolts 8 and nuts 9. Reference numerals 10, 10, . . . denote handrail members such as wire ropes and chains, which are connected to the above-mentioned support column 1 via attachment fittings 14 provided on the support column 1. Hole 1 in which the bottom of column 1 and cylindrical part 11 are buried
A gap 16 is provided between the bottom of the
When an impact is applied to the pillar 1, the pillar 1 is tilted so that the impact energy can be absorbed. In order to prevent corrosion of the cylindrical portion 11, there is also a structure in which the entire outer surface of the cylindrical portion 11 is covered with a layer of rubber, that is, the cylindrical portion 11 is embedded within the rubber material 12.

FIG. 7 is another example of a conventional strut structure that operates essentially in the same manner as the strut structure of FIG. 6, and is primarily installed on an existing breakwater. In the figure, the strut 1 is inserted into a metal cylindrical part 18 having a mounting flange 17 at the bottom, and the strut 1 and the cylindrical part 1
8 is filled with a rubber material 19. In this example, the rubber material 19 is also interposed between the lower surface of the flange 17 and the surface of the concrete 2. In this support structure, a hole 22 is made in the concrete 2 and an anchor bolt 8 is fixed thereto, and the anchor bolt 8 and a nut 9 are fixed at the flange 17. A gap 20 is provided between the bottom of the column 1 and the surface of the concrete 2 so that the column 1 tends to tilt when an impact is applied to the column 1. Also in this conventional example, in order to prevent corrosion of the cylindrical portion 18,
Some have the entire surface of the cylindrical portion covered with a rubber material.

The strut structures shown in FIGS. 6 and 7 are as follows:
Although it absorbs much more impact energy and has better durability against impact than the strut structures shown in FIGS. 3 to 5, there are still problems that need to be improved. FIGS. 8 and 9 are schematic partial sectional views for explaining this problem. These eighth
Although the drawings and FIG. 9 are intended to explain the problems associated with the conventional strut structure shown in FIG. 7, this explanation also applies directly to the problems associated with the conventional strut structure shown in FIG.

FIG. 8 shows the state of the column structure at the time of installation, with column 1 standing vertically. As shown in Fig. 9, when an impact is applied to the support column 1 in the direction of the arrow, the support support 1 tilts as shown and absorbs the impact energy, preventing damage to the support support 1 and the attached part of the concrete 2. can. However, at this time, the support column 1 is tilted about the center point 21 of the portion inserted into the cylindrical portion 18, so the vicinity of the upper and lower ends of the rubber material 19 are greatly expanded or compressed. , the central region undergoes little stretching or compression. For this reason, the stress applied to the rubber material is concentrated near the upper and lower ends of the rubber material, and fatigue occurs quickly in these parts, and damage begins from these parts, resulting in a relatively short overall lifespan. In addition, the contact area between the support 1 and the rubber material 19 tends to create a gap 23 when the support 1 is tilted as shown in FIG.
There is a drawback that corrosion starts from this part.

[Means for solving the problem] This invention is an attempt to eliminate the drawbacks of the conventional support structure as shown in FIGS. 3 to 7. The support structure according to this invention has a base and its It consists of a pillar planted in the center of the top surface. The base is made of a rubber-like elastic body, and a reinforcing plate formed of a metal plate having a circular window is embedded close to the bottom surface of the base, and a reinforcing plate with a smaller diameter than the reinforcing plate is buried close to the top surface of the base. A reinforcing disk formed of a metal plate is buried, a mounting hole is drilled in the periphery of the reinforcing disk to penetrate the elastic body and the reinforcing plate, and a mounting hole is formed in the center of the reinforcing disk to pass through the elastic body and the reinforcing disk. It has a central hole drilled in it. The column is attached to the base by screwing a bolt inserted into the center hole from the bottom side into a screw hole provided at the lower end of the column.

[Operation] The above-mentioned support structure is installed by inserting an anchor bolt set on a quay wall or the like into the above-mentioned attachment hole and tightening a nut.

When pressure from waves or impact from a collision with driftwood, etc. is applied to the above-mentioned pillar, the elastic body stretches between the reinforcing plate and the reinforcing disk on the side where these external forces are applied, and the elastic body stretches between the reinforcing disk and the reinforcing disk on the opposite side. Compression of the elastic body occurs between it and the quay surface, and the stress is absorbed. Moreover, at this time, no gap is created between the reinforcing plate or reinforcing disk and the elastic body, which is open to the outside world, thereby preventing seawater, earth and sand from entering the gap and corroding various parts. be able to.

[Example] In FIGS. 1 and 2, 30 indicates a base. The base 30 is made of a rubber-like elastic body 31 and has a disc shape, and a portion close to the bottom of the base 30 has a
A metal reinforcing plate 33 having a circular window 32 with a diameter slightly smaller than the outer diameter of the base 30 is embedded, and a metal reinforcing disk 34 having a smaller diameter than the circular window 32 is embedded in a portion close to the upper surface of the inside. ing.

Attachment holes 35, 35, . , 36... are recessed.

A coupling hole 37 is formed in the center of the base 30, passing through the elastic body 31 and the reinforcing disk 34.A screw seat 38, in which the elastic body 31 is made thin, is recessed around the lower part of the coupling hole 37. It is set up.

The support column 1 is made of a metal tube, and has a screw hole 40 formed in its closed lower end 39. This pillar 1
By screwing the bolt 41 inserted into the coupling hole 37 from below the base plate 30 into the screw hole 40,
It is coupled to the base 30.

In the above-mentioned strut structure, when an external force is applied to the strut 1 in the direction of the arrow 42, expansion occurs inside the elastic body 31 at a portion A between the reinforcing plate 33 and the reinforcing disk 34, and the reinforcing disk 34 and Compression occurs at part B between it and the mounting surface of the quay wall, thereby absorbing external forces. At that time, no gap is created between the elastic body 31 and the reinforcing plate 33 and the reinforcing disk 34, which leads to the outside world, so the reinforcing plate 33 and the reinforcing disk 34 are not corroded, and the column structure can be used for a long time. I can endure it.

[Effects of the invention] As described above, with this invention, in addition to being able to absorb a large external force by using an elastic body, when an external force is applied, the contact surface between the metal part and the elastic body is connected to the outside world. A gap is created, and the metal parts are prevented from being corroded by seawater or earth and sand that enters the gap, thereby maintaining a long life.

[Brief explanation of the drawing]

Figure 1 is a partially vertical front view of an embodiment of this invention;
Figure 2 is the plan view, Figure 3, Figure 4, Figure 5,
6 and 7 are partially cutaway front views showing the conventional example, respectively, and FIGS. 8 and 9 are sectional views of the support portion of the conventional example shown in FIG. 7 in normal operation and when external force is applied, respectively. be. DESCRIPTION OF SYMBOLS 1... Support column, 30... Base, 31... Rubber-like elastic body, 32... Round window, 33... Reinforcement plate, 34...
Reinforcement disk, 35...Mounting hole, 39...Lower end of column, 41...Bolt.

Claims (1)

[Scope of utility model registration request] A reinforcing plate made of a metal plate having a circular window is buried close to the bottom of the base made of a rubber-like elastic body, and a reinforcing plate with a smaller diameter than the above reinforcing plate is buried in the center near the top of the base. A reinforcing disk made of a metal plate is buried therein, and a mounting hole passing through the elastic body and the reinforcing plate is drilled in the periphery of the base, and the elastic plate is inserted into the center of the base from the bottom side. A support structure for a safety fence comprising a bolt inserted through the body and the reinforcing disk and screwed into the lower end of the support.