JPS6160930A - Method of reinforcing corrosion prevention for steel pipe pile - Google Patents

Abstract

PURPOSE:To perform an easy, rapid, and reliable reinforcing work for corrosion prevention, by a method wherein a steel pipe is surrounded with forms formed with semicylindrical split cylindrical form and reinforcing bodies mounted to the inside thereof, and a space between the forms and the steel pipe pile is filled with a curable filler. CONSTITUTION:Plural split cylindrical forms 3 with reinforcing bodies, each formed with a semicylindrical split cylindrical form 1 and reinforcing bodies 2 mounted to the inside thereof, are disposed so as to surround a position, where a corrosion part 5 in a steel pipe pile 4 is present. A space between a cylindrical form, formed with the split cylindrical forms 1, and a steel pipe pile 4 is filled with a curable filler 6. This, since the reinforcing bodies 2 are previously manufactured in a shop on a land, enables production of the split cylindrical form 3 with the reinforcing bodies 2 of high quality and high precision, enables easy and rapid mounting of the forms 3 to the steel pipe pile 4, and permits to perform a reinforcing work of high quality for preventing corrosion of the steel pipe pile.

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 and port structures using steel pipe piles.

[Prior art]

As shown in Figure 19, in marine and port structures such as bridges 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 interference with the functions of

Conventionally, the method for completely corrosion-proofing reinforcing a steel pipe pile with holes caused by corrosion is to use an underwater stand welding gun to attach a large number of stand dowels underwater around the upper and lower parts of the steel pipe pile where the corrosion has progressed. Welded steel pipe piles and placed a large number of reinforcing bars around the parts of the piles that had progressed to corrosion due to underwater work, as well as around the stand dowels.
A method has been implemented in which a cylindrical reinforcing body made of reinforcing bars is constructed, and underwater concrete is placed between a steel pipe pile and a formwork placed around the cylindrical reinforcing body and a stand dowel.

However, in the case of the conventional anti-corrosion reinforcing method, it is necessary to string a large number of reinforcing bars through underwater work, resulting in extremely low work efficiency and high costs, and furthermore, there are problems in that it is difficult to manage and check the condition of the reinforcing bars. I was disappointed.

[Purpose and structure of the invention]

The object of the present invention is to provide a corrosion-proofing reinforcement method for steel pipe piles that can advantageously solve the above-mentioned problems,
The gist of the present invention is to form a plurality of split cylindrical reinforcing bodies 6, which are made up of a split cylindrical form 1 and a steel split cylindrical reinforcing body 2 attached to the inside of the split cylindrical form 1, to form a steel pipe pile. A cylindrical reinforcing formwork is constructed by arranging the corroded part 5 in such a way that it surrounds the position where the corroded part 5 is located. A method for corrosion-proofing and reinforcing steel pipe piles, which is characterized by filling a hardenable filler 6.

〔Example〕

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

5 to 12 show examples of the split cylindrical formwork 6 with reinforcing bodies used in the embodiments of the present invention, and in the case of the first example shown in FIGS. 5 and 6, Inside the semi-cylindrical steel split cylindrical formwork 1, semi-circular transverse reinforcing bars 8 with hooks 7 formed at both ends are arranged at intervals in the vertical direction, and each semi-circular transverse reinforcing bar 8 extends in the longitudinal direction. A plurality of groove-shaped supporting reinforcing bars 9 are arranged at intervals, and both ends of the supporting reinforcing bars 90 are fixed to the split cylindrical formwork IK by welding, and the semicircular horizontal reinforcing bars 8 are in bath contact with the supporting reinforcing bars 9. The bars are connected by bundling, and furthermore, inside the divided cylindrical formwork 1, semicircular horizontal reinforcing bars 8 are arranged at intervals in the longitudinal direction. The welds are connected to the reinforcing bars 9 or both by bundling, and the semicircular transverse reinforcing bars 8. The supporting reinforcing bars 9 and the longitudinal reinforcing bars 1o constitute a steel split cylindrical reinforcing body 2.

In the case of the second example shown in FIGS. 7 and 8, a steel bar-shaped support member 11 is used in place of the support reinforcing bar 9, but the other configurations are the same as in the first example. .

In the case of the sixth example shown in FIGS. 9 and 10, a plurality of semicircular support members 12 made of shaped steel such as angles are arranged vertically inside a semicylindrical steel split cylindrical form 1. The semicircular support members 12 are arranged at intervals, and are fixed to the divided cylindrical form 1 by welding, and are spaced apart in the longitudinal direction of the semicircular support members 12 inside the divided cylindrical form 1. The plurality of longitudinal reinforcing bars 10 arranged are inserted through the through holes of each semicircular support member 12 and connected by welding, and each of the vertical reinforcing bars 10 and each semicircular supporting member 12 forms a reinforcing body 2 in the shape of a divided steel tube. is configured.

In the case of the fourth example shown in FIGS. 11 and 12, a large number of supporting members 13 made of cut steel sections such as angles are arranged at intervals in the vertical direction and in the circumferential direction of the divided cylindrical form. This is connected to the divided cylindrical formwork 1 by welding, but the other configurations are the same as in the sixth example.

Figures 13 to 15 show the mounting structure of the steel split cylindrical reinforcing body 2 when using split cylindrical formwork made of glass fiber-reinforced cementitious material or reinforced concrete. In the case of FIG. 13, a plurality of through holes 14 are provided at the supporting member attachment positions in the divided cylindrical formwork 1, and the through holes 14 are provided with a female screw member 1 made of metal or plastic.
5 is fitted from the inside of the formwork and fixed with an adhesive, and the outside part of the formwork inside the through hole 14 is filled with a filler 16 such as underwater hardening putty, and the steel split cylindrical reinforcing body 2
A plurality of bolts 17 inserted through the semicircular support member 12 are screwed into the female screw member 15, and the bolts 17 are inserted into the semicircular support member 12.
Thus, the semicircular support member 12 is fixed to the divided cylindrical formwork 1.

In the case of FIG. 14, a plurality of female threaded holes 18 are provided at the supporting member attachment positions in the split cylindrical formwork 1, and are inserted into the semicircular support member 12 in the steel split cylindrical reinforcing body 2. 17 is screwed into the female screw hole 18, and the semicircular support member 12 is fixed to the divided cylindrical formwork 1 by the bolt 17.

In the case of FIG. 15, female threaded members 15 are fitted and fixed into a plurality of through holes 14 provided at horizontal reinforcing bar support positions in the split cylindrical formwork 1, as in the case of FIG.
6 is filled, and the male threaded part at one end of the support rod 19 made of a steel rod is screwed into the female threaded member 15, and the semicircular horizontal reinforcing bar 8
are connected to the support rod 19 by welding or bundling, and the vertical reinforcing bars 10 arranged at intervals in the longitudinal direction of the semicircular horizontal reinforcing bars 8 and the semicircular horizontal reinforcing bars 8 and 9 are connected to the supporting rod 19 or both. , the welded rings are connected by binding.

The vertical reinforcing bars 10 are connected to a semicircular support member 12 and a support member 1.
3, as shown in FIG. 16, a slit 20 may be provided in the semicircular support member 12 and the support member 13, and the vertical reinforcing bar 10 may be fitted into the slit 20 and fixed by welding. 1 to 6 show an embodiment of the present invention using the first example of the split cylindrical reinforcing frame 3 shown in FIGS. 5 and 6. And as shown in Fig. 2, there is corrosion f around the steel pipe pile 4.
A number of dowels 21 are fixed by welding slightly above the ls5 and slightly below the corroded part 5, and a plurality of brackets 22 are fixed by welding etc. around the steel pipe pile 4 below the lower dowel 21. , the split-type annular bottom form 23 is fitted onto the steel pipe pile 4 and placed on the bracket 22Vc, and the outer peripheral edge of the annular bottom form 26 is brought into contact with the stopper 24 provided at the tip of the bracket 22. Keep the skins close together.

Next, a pair of split cylindrical reinforcement-equipped formworks 6 are arranged so as to surround the entire circumference of the portion of the steel pipe pile 4 where the corroded portion 5 is located, and each split cylindrical reinforcement-equipped formwork 6 has a divided cylindrical shape. The lower end of the frame 1 is placed on the annular bottom form 26, and the stopper 2
4, and with the circumferential end surfaces of each divided cylindrical form 1 butted against each other, wire or metal band 25 or the like is wrapped so as not to separate each divided cylindrical form 1. and then each divided cylindrical formwork 1
A hardening filler 6 such as underwater concrete that hardens in water is filled between the steel pipe pile 4 and the steel pipe pile 4. Figure 4 shows the anti-corrosion reinforcement part of the completed steel pipe pile.

Figures 17 and 18 show other examples of connecting parts of formwork B with split cylindrical reinforcing bodies, and show semicircular shapes at the vertical ends of each formwork B with split cylindrical reinforcing bodies. A bolt 26 is inserted into the end of the support member 12 and fixed by welding, and a steel joint plate 27 is abutted across each semicircular support member 12, and the bolt 26 is inserted through the joint plate 27 and the bolt is 26Vcl; 4 and 9 nuts 28V
The joint plate 27 and the semicircular support member 12 are connected by c.

When carrying out this invention, three or more divided cylindrical reinforcing body-attached formworks 6 may be combined to form a cylindrical reinforcing body-attached formwork, or a cylindrical reinforcing body-attached formwork may be constructed. The shape may be either cylindrical or prismatic.

〔Effect of the invention〕

According to this invention, a plurality of split cylindrical reinforcing body formworks 3, which are manufactured in advance in a land-based factory or the like, are arranged so as to surround the position where the corroded part 5 of the steel pipe pile 4 is located. A formwork with a reinforcing body is constructed, and a hardenable filler 6 is filled between the cylindrical formwork constituted by each divided cylindrical formwork 1 and the steel pipe pile 4, so the formwork is used to form a reinforcing body. can be set in a predetermined position, therefore, the reinforcing body assembling work by underwater work can be omitted, and the reinforcing body can be easily and quickly installed in a predetermined position. Since it is manufactured in advance in a factory on land, it is possible to manufacture the formwork 3 with split cylindrical reinforcing bodies of high quality and high precision, and therefore it is possible to carry out highly reliable anti-corrosion reinforcement work for steel pipe piles. The effect of this can be obtained.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention, and Figure 1 is a partially longitudinal side view showing the next state after setting the cylindrical reinforcing formwork and the bottom formwork. Figure 2 is a cross-sectional plan view, Figure 5 is a longitudinal side view showing the hardenable filler placed between the formwork and the steel pipe pile, and Figure 4 shows the completed anti-corrosion reinforcement section. FIG. 5 to 12 show examples of the formwork with split cylindrical reinforcing bodies that can be used in the embodiments of the present invention. FIG. 5 is a plan view of the first example, and FIG. 6 is a plan view thereof. Front view,
Fig. 7 is a plan view showing the second example, Fig. 8 is a front view thereof, Fig. 9 is a plan view showing the sixth example, Fig. 10 is a front view thereof, and Fig. 11 is a plan view showing the fourth example. FIG. 12 is a front view thereof. 13 to 15 are longitudinal side views showing other examples of the split cylindrical reinforcing body attachment portion to the split cylindrical formwork, and FIG. 16 is a perspective view showing another example of the vertical reinforcing bar attachment portion to the support member. ,
Fig. 17 is a plan view showing another example of the connecting part of the formwork with split cylindrical reinforcing bodies, Fig. 18 is an enlarged longitudinal cross-sectional view of the connecting part, and Fig. 19 is a plan view showing another example of the connecting part of the formwork with split cylindrical reinforcing body. A side view showing the location of the corroded area. In the figure, 1 is a divided cylindrical formwork, 2 is a steel divided cylindrical reinforcement body, 5 is a formwork with a divided cylindrical reinforcement body, 4 is a steel pipe pile, 5 is a corroded part, 6 is a hardening filler, 8 is a semicircular horizontal reinforcing bar, 9 is a support reinforcing bar, 10 is a vertical reinforcing bar, 11 is a steel bar-shaped support member, 12
1 is a semicircular support member, 13 is a support member, 15 is a female screw member, 16 is a filler, and 17 is a bolt. 8 Figure 12 Procedural Amendment (Toge) December 5, 1981

Claims (1)

[Claims] A plurality of split cylindrical reinforcing body formworks 3 consisting of a split cylindrical formwork 1 and a steel split cylindrical reinforcing body 2 mounted inside the formwork 1 surround the position where the corroded portion 5 of the steel pipe pile 4 is located. A cylindrical reinforcing body-equipped formwork is constructed by arranging the cylindrical formwork as shown in FIG. A corrosion-proofing reinforcement method for steel pipe piles.