JPH0156219B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for corrosion-proofing and reinforcing the vicinity of corroded parts of steel pipe piles in marine/port structures using steel pipe piles.

[Prior art]

As shown in Figure 11, in marine and port structures such as piers that use steel pipe piles 4, holes are formed in the steel pipe piles 4 due to corrosion in areas where corrosion is severe, such as near splash zones and tidal zones. Problems have arisen, such as interfering with the functions of

Conventionally, the method of anti-corrosion reinforcement for steel pipe piles with holes due to corrosion is to use an underwater stud welding gun to underwater weld a large number of stud dowels around the upper and lower parts of the steel pipe pile where the corrosion has progressed. , and placing reinforcing bars around the corroded portion of the steel pipe pile and surrounding the stud dowel, and cylindrical formwork surrounding the reinforcing bars and the stud dowel, and placing underwater concrete between the formwork and the steel pipe pile. A method is being implemented.

However, in the case of the conventional anti-corrosion reinforcement method,
Since the work involves welding a large number of stud dowels one by one underwater using an underwater stud welding gun,
There are problems in that work efficiency is poor and the cost is high because it requires long hours of diving work.

[Purpose and structure of the invention]

The purpose of this invention is to provide a corrosion-proofing reinforcement method for steel pipe piles that can advantageously solve the above-mentioned problems. A split type band 3 with dowels, which is made up of a large number of dowels 2 attached to the band component 1, is fixed to at least one of the upper and lower parts of the corroded part 5 of the steel pipe pile 4, and then the split band with upper and lower dowels is A steel cylindrical reinforcing body 6 is arranged to surround the steel pipe pile 4 across the form band 3, and a formwork 7 is arranged to surround the steel cylindrical reinforcement 6, and then the formwork 7 and the steel pipe Pile 4
A method of reinforcing corrosion protection for steel pipe piles, which is characterized by filling a hardenable filler 8 between the piles.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

FIGS. 6 and 7 show a split type band 3 with dowels used in an embodiment of the present invention, in which a semicircular steel band component 1 is provided with connecting flanges 9 at both ends. A dowel 2 consisting of a large number of stud bolts was fixed to the outer surface by welding, and a pair of band members 1 were arranged to form a circular shape, and the flanges 9 of the opposing band members 1 were inserted through them. They are connected by bolts 10. Note that the split type band 3 with dowels configured in this manner is manufactured in advance at a factory or a land base.

When using the split band 3 with dowels to provide anti-corrosion reinforcement to the corroded part of a steel pipe pile, first, as shown in FIG. A split type band 3 with a dowel is fitted slightly below and tightened and fixed with bolts 10, and a plurality of brackets 11 around the steel pipe pile 4 are welded, etc. below the split band 3 with a dowel at the bottom. The split type annular bottom form 12 is fitted onto the steel pipe pile 4 and placed on the bracket 11, and the outer peripheral edge of the annular bottom form 12 is fixed to the stopper 13 provided at the tip of the bracket 11. bring parts into contact or close together.

Next, as shown in FIGS. 2 and 3, a steel cylindrical steel bar consisting of a large number of vertical reinforcing bars 14 and a large number of annular reinforcing bars 15 is installed across the tip of the dowel 2 in the split band 3 with upper and lower dowels. Place the reinforcing body 6,
The cylindrical reinforcing body 6 is fixed to the dowel 2 by binding or the like.

Next, as shown in FIG. 4, a split cylindrical formwork 7 surrounding the upper and lower split bands 3 with dowels and the steel pipe pile between them is placed on the upper surface of the outer peripheral side of the bottom formwork 12, The lower end of the cylindrical formwork 7 is brought into contact with or close to the stopper 13, and the split type cylindrical formwork 7 is tied up by wrapping it with wire or a metal band so as not to be separated, and then the cylindrical formwork A hardenable filler 8 such as underwater concrete that hardens in water is filled between the formwork 7 and the steel pipe pile 4.

After the filler 8 has hardened, the cylindrical formwork 7 is removed if necessary. Figure 5 shows the anti-corrosion reinforcement part of the completed steel pipe pile.

FIGS. 8 to 10 show other examples of the dowel attachment portion for the band component, and FIG.
In the case of the figure, a dowel 2 made of a steel bolt is inserted into a band component 1 made of a non-metallic material, and a nut 16 screwed onto the inner end of the dowel 2 is provided inside the band component 1. accommodated in the recess 17;
and a band component 1 and a dowel 2 inserted therein.
It is fixed to the nut 16 with an adhesive or the like.

In the case of Fig. 9, the band component 1 made of non-metallic material
A reinforcing protrusion 18 is provided on the outer surface of the dowel penetrating portion in
is provided, but the other configurations are the same as in the case of FIG. In the case of Fig. 10, the male threaded part of the dowel 2 is screwed into the band component 1 made of non-metallic material, and is not fixed with adhesive but fixed with a nut 16, but the other configuration is in the case of Fig. 9. It is similar to

Band component 1 in Figures 8 to 10
Reinforced plastic, concrete, glass fiber-containing concrete, etc. can be used as the non-metallic material constituting the structure.

When carrying out this invention, in order to reliably prevent the split band 3 with dowels attached to the steel pipe pile 4 from shifting downward, the inner surface of the band component 1 or both this and the steel pipe pile should be submerged in water in advance. An underwater adhesive such as hardened putty may be applied, or the band component 1 may be welded to the steel pipe pile 4 after the doweled split band 3 is fitted and fixed to the steel pipe pile 4. Further, a split type band with a dowel divided into three or more parts may be used, and the dowel 2 may have an arbitrary shape other than that shown in the drawings.

The flanges 9 and bolts 10 at both ends of the band component 1 may be omitted, and the band component 1 with a dowel may be fixed to the steel pipe pile 4 by welding,
Alternatively, a bolt hole may be bored on the diameter line of the band component 1 and the steel pipe pile, and the band component may be fastened and fixed to the steel pipe pile using a long bolt inserted into the bolt hole.

The steel cylindrical reinforcing body 6 may include reinforcing bars, steel strips,
An appropriate combination of angle irons may be used.
Further, as the hardening filler 8, instead of underwater concrete, resin mortar, polymer cement, cement mortar, concrete or cement mortar mixed with steel fiber or glass fiber may be used. Three or more stages may be provided at intervals in the vertical direction with respect to the steel pipe pile 4.

The split type band 3 with dowels may be fixed only to either the upper or lower part of the corroded part of the steel pipe pile 4. In this case, the split type band with dowels may be fixed to either the upper or lower part of the corroded part of the steel pipe pile. The force may be transmitted by increasing the length of the curable filler on the side to which it is not fixed, thereby increasing the shearing force transmission length.

〔Effect of the invention〕

According to this invention, a split type band 3 with dowels, which is made up of a plurality of band members 1 previously manufactured on land or the like and a number of dowels 2 attached to the band members 1, is attached to a corroded part of a steel pipe pile 4. Since it is fixed to at least one of the upper and lower parts of the dowel, there is no need to weld a large number of stud dowels underwater, which improves work efficiency and greatly reduces costs. Since the band is a split type,
It can be easily attached by fitting from the side of the steel pipe pile 4, and furthermore, since the band component with dowels can be manufactured on land, quality control can be easily performed. In addition, when welding a stud dowel to a steel pipe pile using an underwater stud welding gun, there are restrictions on the material and shape of the stud dowel, but in the case of this invention, the band components with the dowel can be manufactured on land, so the dowel can be welded on land. The material and shape can be arbitrarily selected, and therefore effects such as rational design can be obtained.

[Brief explanation of drawings]

Figures 1 to 5 show one embodiment of the present invention, in which Figure 1 is a side view showing a state in which a split type band with dowels is attached to a steel pipe pile, and Figure 2 is a side view showing a state in which a split type band with dowels is attached to a steel pipe pile. A partially longitudinal side view showing the state in which the cylindrical reinforcing body is arranged across the split type band, Fig. 3 is a sectional view taken along the line A-A in Fig. 1, and Fig. 4 shows the structure between the formwork and the steel pipe pile. FIG. 5 is a side view showing the completed anti-corrosion reinforcing section; FIG. 6 is a partially cutaway plan view of a split band with a dowel used in an embodiment of the present invention. , Figure 7 is its front view, Figures 8 to 1
FIG. 0 is a sectional view showing a dowel attachment portion to a band component, and FIG. 11 is a side view showing the position of a corroded portion of a steel pipe pile in a marine/port structure. In the figure, 1 is a band component, 2 is a dowel,
3 is a split type band with a dowel, 4 is a steel pipe pile, 5 is a corroded part, 6 is a steel cylindrical reinforcement body, 7 is a formwork, 8 is a hardening filler, 10 is a bolt, 11 is a bracket,
12 is an annular bottom formwork, and 13 is a stopper.

Claims (1)

[Claims] 1 A split type band 3 with dowels, which is made up of a plurality of prefabricated band members 1 and a number of dowels 2 attached to the band members 1, is attached to a steel pipe pile 4.
A steel cylindrical reinforcement body 6 is fixed to at least one of the upper and lower parts of the corroded part 5 in A method for anti-corrosion reinforcement of steel pipe piles, which comprises arranging a formwork 7 surrounding a cylindrical reinforcing body 6, and then filling a hardenable filler 8 between the formwork 7 and the steel pipe pile 4.