KR200200540Y1 - Forced reefs simply assembled with bolts and nuts without welding - Google Patents

Abstract

The coastal fish stocks are being depleted due to the declaration of the 200 nautical mile economic zones of the world and the development of fishing technology. Korea is also investing about 200 billion won annually for artificial reefs. All of these reefs are made of concrete, and they are difficult to attach seaweeds due to the toxicity of cement compared to steel reefs, and are too heavy for their volume. Therefore, excessive facility costs are required. However, since the wave load acting on the forced reef is a cyclic load, stress concentration occurs in the welded area, which causes problems of fatigue failure and corrosion damage. Therefore, in Korea, only concrete reefs are put in place, but in Japan, where fishery technology has been developed, fishery organisms have gathered on shipwrecks for many years and many shellfish and seaweeds stick to the bottom plate of ships. have.

The present invention eliminates the welding part, which is a problem of the forced reef, so that anyone can easily assemble with bolts and nuts without welding. To this end, the members of the same size and length were joined to the coupling connector (漣 結構) to combine the bolts and nuts to produce a forced reef. The bolts and nuts are coupled to each member to distribute the load received by the grass, and the shock is absorbed, resulting in structural stability.

Description

Forced reef simply assembled with bolts and nuts without welding work {.}

Concrete reefs have been dropped since the early 1970s to improve coastal fisheries. However, concrete reefs are heavy due to their heavy weight per unit volume, which is expensive, and it is impossible to drop them because they are buried in tidal flat areas such as the west coast. In addition, it is difficult to change the size and shape of the reefs, and the production period is long, and large reefs require a lot of facility cost due to transportation, marine crane, and dropping operations.

According to the problems of the concrete reefs, the steel reefs having excellent effects or performances are always subject to the stress damage and corrosion damage caused by salt in the sea due to the repeated load acting on the marine structure.

In order to minimize corrosion damage and stress concentration caused by salinity, this paper makes it possible to easily manufacture steel reefs by easily connecting bolts and nuts to the connector of castings without welding due to corrosion by using general structural steel pipe (PIPE). Casting connectors were made of salt-resistant castings.

Structural diagram of the steel reefs of Figure 1 After the structural pipes (STEEL PIPE), the main material of the steel reefs, are cut to a certain length according to the size of the steel reefs to be installed Two bolt holes (HOLE) are machined as shown in (2) so that they can be bolted together. The connectors of (a), (b), (c) and (d) are made of castings resistant to salt corrosion and are assembled with (1) steel pipe (PIPE) in Figure 4 with bolts and nuts. Two holes are processed.

2 shows a plan view and left and right side views of a forced reef.

3 shows a sectional view of a forced reef.

As shown in Figure 1, the steel reef is manufactured by combining the steel pipe for general structure (PIPE) and the casting parts (a), (b), (c), (d) with bolts and nuts, and the connector (a) is connected. Three branches are used for each corner of the forced reef, and the connector (b) is used for the four sides of the forced reef and the connector (c) is used for the cross section of the forced reef with five connection branches. The connector (d) has six connection branches, which are used for connection at the center part. Forced reef can be adjusted in size and shape according to the combination of the connector, and by changing the angle of the connector can be assembled and fabricated the forced reef of the triangle and polygon.

Fig. 2 is a plan view, left and right side view of the steel reef, and the detailed view on the right shows (A) a general structural steel pipe (PIPE) and (D) connector assembled with (B) bolts and nuts. Shows the cross-sectional view of the rectangular parallelepiped reef and (A) the bolts of the connector for joining the (PE) pipe for general structure and (C) the connector are processed in 90 ° direction and combined with bolts and nuts. Less shaking after assembly. In addition, (D) bolt hole (HOLE) of connector is processed at the time of casting, and (A) steel pipe and (C) connector are processed into oval shape for easy assembly, and (A) steel pipe can be easily assembled even if the length is slightly different. Fig. 4 is a structural diagram of a steel pipe, which is a major part of steel reefs. (1) Both ends of steel pipes have holes (HOLE) for bolts and nuts as shown in (2). (1) The length of the steel pipe is mass-produced in the same way, and it is simply assembled by joining the bolts (a), (b), (c), and (d) with the bolts of Figure 1. There is no corrosion problem of the welded part in the sea for about 30 years, which is the life of the reef, and as the assembly of each part, the transportation cost of the forced reef is saved, and it can be assembled on the barge and can be dropped, repaired and repaired. Each component is combined with bolts and nuts to produce forced reefs, so the underwater loads of the reefs are distributed and structurally absorbed by shock absorption.The number and size of the bulkheads of the reefs that meet the conditions of coastal fisheries depends on the number of connectors used. The shape can be easily adjusted. If iron plate is attached to the bottom of steel reefs, it is lighter than concrete reefs, and it is possible to produce steel reefs that perform well in the tidal flat area.

This design is a forced reef combined with bolts and nuts without welding,

Compared with concrete reefs, manufacturing cost and delivery cost can be reduced and various shapes of reefs can be manufactured. Unlike concrete reefs, it can be easily assembled and dropped from barges on the sea, so the transportation cost is low and the weight per unit volume is low, so the cost of discharging is low. In addition, it is possible to drop on the tidal flat area by attaching an iron plate to the bottom surface. Unlike general steel control candle, there is no welding part, so there is no corrosion problem of welding part when it is old, and more than 30% of manufacturing cost can be saved. As it is manufactured by assembling the pipe of the same length, even the unskilled person can easily produce the forced reef and the standardized mass production is possible, so the production cost is low. In addition, it is excellent in structural stability because shock load is absorbed by dispersing the load received by the bolts and nuts of each member. Forced reefs are more likely to have shellfish and algae due to corrosion than concrete reefs.

Claims (1)

Forced reef fabricated by joining members of the same length with bolts and nuts without welding by using coupling connectors, and forced reef fabricated by combining with bolts and nuts having various shapes depending on the shape of the connector