JPH0354189Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a steel plate for reinforcing underwater steel structures. This invention relates to a reinforcing steel plate for reinforcing damaged parts such as breakage.

[Prior art]

In particular, underwater steel structures such as steel pipe piles, steel sheet piles, steel pipe sheet piles, and H-shaped steel piles used at the bottom of marine facilities such as quays and piers constructed under the sea are subject to severe corrosion, unless appropriate anti-corrosion treatment is applied. They are subject to damage due to corrosion, and may also be damaged by unexpected external forces, making it necessary to reinforce the damaged parts.

Conventionally, if the damaged area due to corrosion is small, it is possible to extend the service life of underwater steel structures by cathodic protection method or coating corrosion protection method, but if the damaged area is large, it is possible to extend the service life of underwater steel structures. As the cross-sectional area becomes narrower and the cross-sectional performance deteriorates, some kind of reinforcing measures are required, and reinforcing materials are welded underwater near the corrosion zone of the underwater steel structure. For example, a corrosion-resistant reinforcing method as shown in Japanese Patent Application Laid-open No. 126826/1983 is carried out, in which a formwork is constructed to create a concrete coating layer around the object, and the formwork is filled with concrete and hardened. was.

If the corroded area is small, a batch reinforcement method has been used in which a steel plate is directly applied to the corroded area and wet underwater arc welding is performed.

[Problem that the invention attempts to solve]

However, the above-mentioned corrosion-resistant reinforcement method for creating a concrete covering layer requires large-scale construction work, such as installing reinforcing materials underwater and installing formwork for pouring concrete, and the cost is enormous. However, it could not be applied to complex underwater steel structures.

In addition, with the butt reinforcement method, the diver is easily affected by gas bubbles, waves, transparency, etc., and the welding position underwater is particularly unstable. In addition, there is a problem that blowholes may occur in the weld heat affected zone of the underwater steel structure, and the bending strength of the underwater steel structure may be reduced. .

[Purpose of invention]

The purpose of the present invention is to solve the above-mentioned problems and to create and provide a steel plate for reinforcing underwater steel structures having an economical and reliable wet underwater arc welding part. It is a purpose.

[Means for solving problems]

The configuration of the present invention that achieves the above-mentioned object is to form a reinforcing steel plate having a bonding surface that comes into close contact with the outside area near the damaged part of the underwater steel structure, and to form a plurality of vertically long slits in the reinforcing steel plate. This is a perforated configuration.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a main part of a first embodiment of the present invention, and FIG. 2 is a perspective view showing a main part of a second embodiment of the present invention.

The present invention relates to a reinforcing steel plate 2 for an underwater steel structure 1. Specifically, the present invention relates to a reinforcing steel plate 2 for reinforcing damaged parts of marine facilities constructed underwater due to corrosion, damage due to external forces, etc. This is a reinforcing steel plate 2 that covers a part of an underwater steel structure 1 that is damaged due to corrosion or external force, and has a shape that closely contacts the shape of the surface of the area outside the vicinity of the damaged part of the underwater steel structure 1. A reinforcing steel plate 2 having a bonding surface is formed, and a plurality of vertically elongated slits 3 are bored into the reinforcing steel plate 2 for underwater welding by wet underwater arc welding.

That is, the underwater steel structure 1 of the present invention refers to steel pipes used under marine facilities such as quays and piers built underwater, and land bridges and bridges built underwater in rivers, lakes, etc. These are piles, steel sheet piles, steel pipe sheet piles, and H-shaped steel piles, and in the illustrated embodiment, the underwater steel structure 1 is the steel pipe pile 1.

In the first embodiment shown in FIG. 1, an underwater steel structure 1
The corroded part of the steel pipe pile 1 is located near the water surface, and the reinforcing steel plate 2 is fixed in both the atmosphere and the water, and the corroded part is located near the damaged part of the underwater steel structure 1. A pair of reinforcing steel plates 2 cut in half in the vertical direction are used as a bonding surface that closely fits the shape of the steel pipe pile 1, that is, a bonding surface that is bent in advance according to the outer diameter of the steel pipe pile 1. It is temporarily attached by bringing the two halves into close contact with each other from both sides so as to cover the damaged part of the first piece, and butting the edges of the two halves in the vertical direction against each other.

A plurality of vertically elongated slits 3 are pre-drilled at appropriate intervals in the circumferential direction on the slightly wider lower side of the reinforcing steel plate 2, and the width of the slits 3 is as follows. It is determined by the thickness of the reinforcing steel plate 2. For example, in the case of the reinforcing steel plate 2 with a thickness of 9 mm, approximately 20 mm is appropriate, and the length of the slit portion 3 is determined by the thickness of the reinforcing steel plate 2. This is determined as appropriate depending on the size of the object, etc.

The fixing of the steel pipe pile 1 and the reinforcing steel plate 2 of the present invention is as follows:
The steel plate upper end 4 of the reinforcing steel plate 2 in the atmosphere is
It is welded to the steel pipe pile 1 in the circumferential direction by a normal arc welding method, and the boundary between the inner wall of the slit portion 3 underwater and the surface of the steel pipe pile 1 is welded by a diver using a wet underwater arc welding method, that is, an insulating holder, waterproof The reinforcing steel plates 2 are welded vertically underwater using a welding rod, and the steel plate mating portions 5 of the reinforcing steel plates 2 are welded underwater using a normal arc welding method in the atmosphere and using a wet underwater arc welding method underwater. be.

Next, the second embodiment of the present invention shown in FIG.
In this embodiment, the reinforcing steel plates 2 are completely submerged in water, and similarly to the first embodiment, a pair of reinforcing steel plates 2 cut in half in the vertical direction are inserted from both sides to cover the damaged portion of the steel pipe pile 1. The reinforcing steel plate 2 is temporarily attached to the reinforcing steel plate 2 so as to be closely butted against each other, and a plurality of longitudinal slits are formed in advance at appropriate intervals in the circumferential direction from the upper and lower edges of the reinforcing steel plate 2 to the upper and lower sides, each having a slight width. The reinforcing steel plate 2 is welded underwater to the steel pipe pile 1 at the slit portion 3 by the wet underwater arc welding method as in the first embodiment, and the steel plate mating portion 5 is also welded underwater in the same manner. It is.

Note that the initial cross-sectional performance of the steel pipe pile 1 is ensured by appropriately setting the thickness of the reinforcing steel plate 2, weld throat thickness, weld length, etc.

In the example, the steel pipe pile 1, which is a substructure of a port facility, was explained, but steel sheet piles, steel pipe sheet piles, H
This can be similarly applied to shaped steel piles and the like by forming a reinforcing steel plate having a joint surface that is in close contact with the surface shape of the outside area near the damaged part.

[Effect of idea]

The present invention is not only extremely economical compared to the conventional corrosion-resistant reinforcing method of creating a concrete covering layer, but is not limited to the shape of underwater steel structures, and is Since the welding is carried out underwater, the diver's welding position remains stable, and the inner wall surface of the slit section, which is the underwater welding section, serves as a guide for the welding rod by applying it to the edge of the slit section at a diagonal position. Therefore, the present invention has an extremely reliable underwater weld, as the diver is relieved from the effects of gas bubbles, waves, transparency, etc., and in addition, the underwater weld is circumferentially This method does not degrade the bending strength of the target steel structure, which is a disadvantage of wet underwater arc welding, and ensures sufficient initial cross-sectional performance, making it a highly practical idea.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of a first embodiment of the present invention. FIG. 2 is a perspective view showing the main parts of a second embodiment of the present invention. 1... Underwater structure or steel pipe pile, 2... Steel plate for reinforcement, 3... Slit portion, 4... Upper end of steel plate, 5...
...Steel plate mating part.

Claims (1)

[Claims for Utility Model Registration] A reinforcing steel plate for covering a damaged part of an underwater steel structure due to corrosion or external force, which has a shape that closely contacts the shape of the surface of the area outside the vicinity of the damaged part of the underwater steel structure. An underwater steel structure characterized by forming a reinforcing steel plate having a welding surface, and drilling a plurality of vertically long slits in the reinforcing steel plate for underwater welding by a wet underwater arc welding method. steel plate for reinforcement.