JPH0749661B2 - Anticorrosion repair and reinforcement method for underwater driving members - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of performing anticorrosion repair or anticorrosion reinforcement of an underwater driving member such as a steel pipe pile or a steel sheet pile driven into a water bottom ground.

[Prior art]

Conventionally, when anti-corrosion repair or anti-corrosion reinforcement of underwater driving members such as steel pipe piles that have been driven into the seabed ground, the anticorrosion repair reinforcement part of the underwater driving members is surrounded by a formwork, and the formwork and anticorrosion repair reinforcement There is known a method of injecting and filling a time-curable filler such as mortar or concrete with the section.
And after the time-curable filler is cured, there is a case where the mold is removed and there is a case where it is buried as it is without removing the mold, when removing the mold, a steel mold is used,
In addition, when burying without removing the formwork, precast glass fiber reinforced cement formwork (GRC formwork) is used.

[Problems to be solved by the invention]

However, in the above-mentioned conventional technique, when the mold is removed after the time-curable filler is cured, the filler is directly exposed to the environment (deterioration-promoting environment) such as seawater or solar radiation. Deterioration is promoted, and drifting materials such as driftwood and ships directly collide with the filling material, so that cracks or defects easily occur in the filling material. In addition, there is a problem that cracking is likely to occur due to curing shrinkage.

Also, the GRC formwork, which is used when it is buried without removing the formwork after the time-curable filler has hardened, is expensive and considerably heavy, so workability during installation work is poor and filling Since it is necessary to add a means to ensure the adhesion with the material and to add an expansion material to prevent the curing shrinkage due to the curing of the filler, the cost will increase and the curing shrinkage of the filler will be further increased. There are problems such as accompanying cracks extending to the GRC formwork.

[Object and Structure of Invention]

An object of the present invention is to provide an anticorrosion repair / reinforcement method for an underwater driving member which can advantageously solve the above-mentioned problems. The gist of the present invention is to provide a fiber reinforced inner surface of a mold 1. A plurality of fiber-reinforced layered molds 3 having the layers 2 attached thereto are arranged so as to cover the corrosion-protected repaired reinforcements of the underwater driving member 4, and the corrosion-protected repaired reinforcements and the fiber-reinforced layered molds. 3, a filling space 5 is provided between the filling space 5 and the filling space 5, and then the time-curable filling material 6 is injected and filled into the filling space 5.

〔Example〕

 Next, the present invention will be described in detail with reference to the illustrated example.

6 and 7 show a mold 3 with a fiber-reinforced layer used in the first embodiment of the present invention, in which glass fiber or synthetic fiber is provided on the inner surface of a semi-cylindrical steel mold 1. The sheet-like fiber reinforcing layer 2 made of the non-woven fabric (or commercially available fiber mat) is detachably fixed with a double-sided adhesive tape or the like, and the outer peripheral edge of the outer surface of the mold 1 is
A steel connecting member 7 having an L-shaped cross section that extends in the vertical direction is fixed by welding, and the steel connecting member 7 is provided with a large number of through holes 8 for inserting bolts.

1 to 5 show a first embodiment of the present invention using the frame 3 with the fiber reinforcing layer. First, as shown in FIG. 1 and FIG. A steel annular bottom plate 11 and a steel annular ring 11 thereof having a mold positioning stopper 10 below a corrosion-resistant repair and reinforcement portion of an underwater driving member 4 made of a steel pipe pile that is supported and supports an upper concrete slab 9. The ribs 12 that support the bottom plate 11 are fixed to each other by welding, and the pair of fiber-reinforced layered molds 3 are arranged in a circular shape so as to surround the anticorrosion repair reinforcing portion of the underwater driving member and are arranged on the annular bottom plate 11. A large number of bolts 13 are inserted through the connecting members 7 at the ends of the adjacent frame 3 with the fiber-reinforced layer, and the bolts 13 are used to form the frame 3 with the fiber-reinforced layer.
The end portions of the mold 1 are mutually fastened together, and a filling space 5 is provided between the anticorrosion repair reinforcing part and the fiber-reinforced layered mold 3.

Next, as shown in FIG. 3, the time-curable filler 6 such as concrete is injected and filled into the filling space 5, and
A part of the time-curable filler 6 penetrates between the fibers in the fiber reinforcing layer 2, and after the time-curable filler 6 is cured, the bolt 13 is removed and the outer mold 1 is removed. Fourth
As shown in FIG. 5 and FIG. 5, a fiber-reinforced cured body layer 14 comprising a fiber-reinforced layer 2 and a filler which has penetrated into and cured therein.
Are formed on the surface layer of the cured filler 6.

When the present invention is carried out, the fibers constituting the fiber reinforcing layer 2 are glass fiber, carbon fiber, polypropylene fiber, polyethylene fiber, nylon fiber, acrylic fiber,
Aramid fiber, amorphous fiber, steel fiber, tetrafluoroethylene fiber, etc. can be used. As the time-curable filler, cement mortar, concrete, polymer cement, resin mortar, premix mortar (glass fiber, steel A mixture of fibers and cement mortar) or the like can be used.

The material forming the formwork is steel, aluminum, FRP
Wood, wood, etc. can be used. After the time-curable filler 6 is cured, the mold 1 may be buried without being removed.

The present invention can be applied to anti-corrosion repair and reinforcement of existing or new underwater driving members. Furthermore, if a reinforcing material such as a reinforcing bar is arranged in advance in the filling space 5 and then a time-curable filler is injected and filled, the strength of the cured filler can be significantly improved.

〔The invention's effect〕

According to the present invention, since the fiber-reinforced cured body layer 14 is formed on the surface layer portion of the cured filler 6 even after the mold 1 is removed, the filler for anticorrosion repair and reinforcement from the environment such as seawater and solar radiation. 6
The filler 6 can be protected from the collision force of drifting objects such as driftwood, and without the use of the GRC formwork manufactured at the factory, it can be simply hardened with time at the construction site. Since the cured filler having the fiber-reinforced cured body layer 14 in the surface layer portion can be formed only by injecting and filling the filler, it is possible to perform the anticorrosion repair reinforcement work of the underwater driving member 4 at low cost, Further, cracks due to curing shrinkage when the filler hardens tends to occur from the surface layer of the filler, but since the surface layer portion of the filler is given toughness by the fiber-reinforced cured body layer 14, it does not cause curing shrinkage. It is possible to prevent the accompanying cracks from occurring,
There is no need to use a heavy formwork like GRC formwork,
Since it is possible to use a lightweight form, it is possible to obtain effects such as easy handling.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a partially cutaway vertical side view showing a state in which a mold with a fiber reinforcing layer surrounding an anticorrosion repair reinforcing portion of an underwater driving member is set. Fig. 2 is a cross-sectional view taken along the line AA in Fig. 1, and Fig. 3 shows a state in which a time-curable filler is filled between the anticorrosion repair reinforcing portion of the underwater driving member and the frame with the fiber reinforcing layer. Cross-section plan,
FIG. 4 is a partially longitudinal side view showing a state in which the anticorrosion repair and reinforcement of the underwater driving member has been completed, and FIG. 5 is a sectional view taken along line BB of FIG. FIG. 6 is a perspective view of a mold with a fiber reinforced layer used in an embodiment of the present invention, and FIG. 7 is a cross-sectional plan view thereof. In the figure, 1 is a form, 2 is a fiber reinforcement layer, 3 is a form with a fiber reinforcement layer, 4 is an underwater driving member, 5 is a filling space, 6 is a time-curable filler, 7 is a connecting member, and 8 is Through holes for inserting bolts, 10 is a mold positioning stopper, 11 is an annular bottom plate, 13 is bolts, and 14 is a fiber-reinforced cured body layer.

Claims (1)

[Claims] 1. A plurality of fiber-reinforced-layer-formed frames 3 each having a fiber-reinforced layer 2 attached to an inner surface of a frame 1, and an underwater driving member 4.
Is arranged so as to cover the anticorrosion repair reinforcement part in the above, and a filling space 5 is provided between the anticorrosion repair reinforcement part and the frame 3 with the fiber reinforcement layer, and then the filling space 5 is cured with time. 1. A method for preventing corrosion, repairing and reinforcing an underwater driving member, which comprises injecting and filling a water-soluble filler 6.