JP2004107875A - Protective cover mounting structure of columnar body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective cover mounting structure of a columnar body having no projection such as a flange and facilitating site work by a simple construction and capable of obtaining a stable corrosion-proof effect for a long period of time by increasing the adhesiveness of a corrosion-proof material and the protective cover. <P>SOLUTION: In the mounting structure of the protective cover 11 for the columnar body by winding the protective cover around the columnar body or the surround of the corrosion-proof material on the columnar body to be fixedly fastened, an overlap section of the protective cover 11 is adhered by a locking device of a titanium rivet pin 14 passing through the overlap section to enlarge the end thereof and is fastened to the columnar body such as a steel pipe pile 18 or the like to be fixed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mounting structure of a protective cover for covering around a columnar body such as a pipe, a column, and a foundation pile installed in water, in the soil, in the atmosphere, and at a boundary portion thereof, and in particular, to a steel pipe such as a harbor structure. The present invention relates to a mounting structure of a cover for protecting a covering material for preventing a tide zone and a splash zone of a pile.
[0002]
[Prior art]
Steel pipe piles, which are building materials for offshore structures such as piers and dolphins, are driven into marine soil and extend through seawater to the surface of the sea. Steel pipe piles are highly corroded in the splash zone and the tidal zone due to the removal of extraneous matter, etc., and it is necessary to perform reliable anticorrosion treatment on this part.
[0003]
Conventionally, as a corrosion protection method used for harbor structures, a tape-like cloth in which a base treatment material containing tannin is applied to the outer periphery of a steel pipe pile and the outer periphery of which is impregnated with petrolatum, tannin, or another rust inhibitor is used. Is wound to form an anticorrosion material, and a coating method is applied around the outer periphery of which a protective cover is attached in order to enhance the adhesion between the anticorrosion material and the steel pipe pile and protect the same from external impact.
[0004]
Usually, the above-mentioned protective cover is formed using fiber reinforced plastic (FRP) in which a thermosetting resin is reinforced with glass fiber or the like. The protective cover is attached by passing a fixing bolt through the angle of the protective cover and tightening the anticorrosion material of the steel pipe pile from the circumferential direction with the bolt and nut.
[0005]
Since the FRP used for this protective cover has high rigidity and lacks flexibility, the protective cover made of FRP is formed by a bolt and a nut penetrating through a pair of angles, which are tightened in the circumferential direction by the tightening force from the circumferential direction. Adhesion is reduced, and a gap is likely to be formed at the base of the angle. Seawater enters from this gap, the rust inhibitor impregnated in the anticorrosion material flows out, and the anticorrosion effect is lost in a short period of time. was there. In addition, FRP has a problem that it is difficult to process on site.
[0006]
Various improvement proposals have been made in order to solve the difficulties of the fastening method via the above-mentioned both-end angles. That is, in order to easily and firmly attach the anticorrosion material of the steel pipe pile and the protective cover, as shown in FIG. 4, a sheet-like cover plate 2 serving as a body of the protective cover 1 and both ends of the cover plate 2 The two angle members 3 and 4 heat-welded to the parts are formed using a relatively flexible glass fiber reinforced thermoplastic resin (FRP), and the cover plate 2 is wound around the anticorrosion material 6 of the steel pipe pile 5. By turning, the one end 2a of the cover plate 2 and the other end 2b of the cover plate 2 overlap, and the angle material 3 welded to the one end 2a of the cover plate 2 and the overlapping other end 2b remain. An attachment structure is provided in which a fixing bolt 7 is passed through an angle member 4 welded to the formed position and the bolt 7 is tightened by a nut 8 (for example, see Patent Document 1).
[0007]
As shown in FIG. 5, in the mounting structure of the protective cover in which the flange portions 10 provided at both ends of the pair of split cover bodies 9 are fastened with bolts 7 and nuts 8, the cover body 9 is an abdomen of the cover body 9. (Central portion) The thickness of the root portion 9b of the flange portion 10 is formed so as to gradually increase as it approaches the flange portion 10 from the center portion 9a, and the flexibility increases as it approaches the abdominal portion 9a of the cover body 9. Even if the parts 10 are strongly bolted to each other, the structure is such that the vicinity of the flange part 10 is bent and deformed so that no gap is generated (for example, see Patent Document 2).
[0008]
[Patent Document 1]
JP-B-61-32468 (page 3, FIG. 8)
[Patent Document 2]
Japanese Utility Model Publication No. 62-190746 (page 4, FIG. 1)
[Problems to be solved by the invention]
However, in a protective cover mounting structure in which both ends 2a and 2b of the cover plate 2 shown in FIG. 4 are overlapped and the two angle members 3 and 4 are bolted, as shown in FIG. 2 is wound around the anticorrosion material 6 of the steel pipe pile 5 and the two angle members 3 and 4 are melted and fixed to the cover plate 2 with a dimension shorter than the outer peripheral length of the anticorrosion material 6. A gap A is created between 3 and 4. In this state, if the two angle members 3 and 4 are tightened in the circumferential direction with the bolts 7 and the nuts 8, the overlapping end portions 2 a and 2 b of the cover plate 2 simply suppress the anticorrosion material 6 lightly. Since the cover plate 2 is a free end that is not completely tightly crimped to the anticorrosion material 6, the cover plate 2 is lifted up at the roots of the angle members 3 and 4 by the reaction of the tightening force of the bolt 7 and the nut 8, Seawater penetrates the anticorrosion material 6 from the gap portion D formed by the lifting, and the rust inhibitor impregnated in the anticorrosion material 6 flows out, and there is a problem that the anticorrosion effect is lost in a short time.
[0009]
In addition, in the mounting structure of the protective cover for bolting the pair of split cover bodies 9 shown in FIG. 5, the thickness of the base portion 9b of the flange portion 10 becomes closer to the flange portion 10 from the abdomen (center portion) 9a. The thickness of the main body cover 9 must be adjusted by gradually increasing the thickness, so that it is difficult to form the main body cover 9 and the production cost increases. In addition, in the case of the main body cover 9 in which the thickness of the base portion 9b of the flange portion 10 gradually becomes thicker as it approaches the flange portion 10 from the abdomen 9a, it occurs when the body cover 9 is tightened with the bolt 7 and the nut 8. The stress is concentrated on the tightening surface of the flange portion 10 and the root portion 16b where the flange portion 10 is erected, and the flange portion 10 and the root portion 9b where the stress is concentrated are thick enough to withstand the stress. A problem that must be strengthened. Furthermore, since it is necessary to tighten both the flange portions 10 erected at both ends of the pair of split cover bodies 9 with bolts 7 and nuts 8, the protective cover is wound around the entire anticorrosion material 6 of the steel pipe pile 5. There were also problems that the number of places to be bolted increased compared to that of the above, and that time was required for site implementation.
[0010]
The present invention has been made in view of the above-mentioned circumstances, and eliminates a fixed idea by all means, does not have a protrusion such as a flange portion which causes inconvenience, and has a simple structure and can be easily implemented on site. The present invention also provides a columnar body protective cover mounting structure that prevents the rust inhibitor impregnated in the anticorrosive material from leaking out and obtains a stable anticorrosive effect over a long period of time. The purpose is to:
[0011]
That is, the present invention is applicable to water poles, civil engineering / building foundation pillars, soil buried pipes and underwater pipes such as water pipe bridges, soil, the atmosphere, and the columnar surroundings of pipes, pillars, foundation piles etc. An object of the present invention is to provide a protective cover mounting structure of a columnar body without a flange portion, which is covered for the purpose of corrosion prevention, makeup, or the like.
[0012]
[Means for Solving the Problems]
In order to solve the above technical issues,
Means of the invention described in claim 1 is a column-shaped protective cover mounting structure in which a protective cover is wound around a columnar body or an anticorrosion material on the columnar body and fastened and fixed,
When an external pressure is applied to a through-hole formed in the overlapped portion of the columnar body or the protective cover wound around the anticorrosive material on the columnar body, the end portion is deformed and expanded when an external pressure is applied. When the distal end portion of the locking tool is expanded after penetrating the locking tool, the superposed protective covers are brought into close contact with each other, whereby the protective cover is fastened and fixed to the columnar body.
[0013]
In other words, the protective cover is wound around the column or the anticorrosion material on the column while applying tension to the column or the anticorrosion material on the column so that the protective cover is in close contact with the periphery of the anticorrosion material on the column. Overlap.
[0014]
Holes are passed through the overlapping portion of the protective cover at appropriate intervals, and a locking device whose end is expanded when external pressure is applied thereto like a rivet is inserted therein.
[0015]
The locking device is compressed to the overlapping portion of the protective cover, and the end portion of the locking device is expanded to be larger than the through hole so that the overlapping portion of the protective cover is in close contact. The protective cover mounting structure of the present invention does not need to provide a part such as a flange which is troublesome to manufacture, so that the manufacturing is simple, and the projections cannot be formed even when the columnar body is mounted, so that the collision with foreign matter after the mounting may result. Damage is also reduced.
[0016]
The locking tool used here is composed of, for example, two parts, a flange and a shaft (mandrel). The locking tool is inserted into a prepared hole of a fastening base material, and the shaft is pulled in by operating a tool. It is possible to use a rivet type fastener that deforms the tip of the flange on the back side of the material, deforms the tip of the flange on the back side of the base material into a hump shape and holds the fastening, and the shaft is cut and the fastening is completed. it can.
[0017]
The protective cover used here is made of metal such as steel, stainless steel, the same alloy, titanium alloy, resin such as vinyl chloride and polyethylene, glass fiber reinforced plastic (FRP), carbon fiber reinforced plastic, etc. Various materials can be selected according to the conditions.
[0018]
The invention described in claim 2 is characterized in a protective cover mounting structure of a columnar body in which an adhesive is applied to an overlapping portion of the protective cover.
[0019]
That is, as described above, while applying tension to the protective cover, the protective cover is wound around the column or the anticorrosive material on the column, and both ends of the protective cover are overlapped, and a locking tool is inserted into the overlap portion to expand the end. Then, the protective cover is fixed. However, if an adhesive is applied to the overlapping surface of the protective cover, temporary fixing can be performed until the protective cover is fixed by the locking tool, thereby facilitating the operation.
[0020]
Further, the adhesive applied to the overlapping portion of the protective cover serves as a sealing material and can prevent intrusion of seawater or the like into the inside of the protective cover.
[0021]
The invention described in claim 3 is characterized by a protection cover mounting structure of a pillar in which a cushioning material is interposed between the protective cover and the pillar or the anticorrosion material on the pillar.
[0022]
By interposing the cushioning material, it is possible to improve the adhesion performance between the columnar body or the anticorrosion material on the columnar body and the protective cover, and to prevent seawater or the like from entering the anticorrosion material on the columnar body. Thus, the anticorrosion performance of the anticorrosion material can be maintained for a long time. Further, when a foreign object collides with the protective cover, the protective cover serves as a cushion to prevent the protective cover from being damaged.
[0023]
As the cushioning material, for example, foamed polyethylene, foamed polyurethane, foamed polystyrene, or the like can be used.
[0024]
According to a fourth aspect of the present invention, when the cushioning material having a feature of the columnar body protective cover mounting structure is attached to the protective cover, the cushioning material is attached to the protective cover. Since the step of inserting the material can be omitted, the attachment of the protective cover is simplified.
[0025]
The invention described in claim 5 is characterized in a columnar body protective cover mounting structure in which the exposed portion of the locking tool is blinded.
[0026]
The locking tool used to bring the overlapping portion of the protective cover into close contact may be appropriately selected according to the material of the protective cover, such as metal fittings such as steel, stainless steel, and titanium, and plastic products, and the environment in which the protective cover is mounted. However, for example, when the protection cover structure is used as a base steel pipe anticorrosion protection cover for a harbor structure, if the locking member is made of steel or stainless steel, it may be corroded by seawater, so that the exposed portion may be sealed. desirable. Further, when the protective cover is used for makeup, the exposed portion of the locking device may impair the aesthetic appearance of the entire protective cover, and therefore it is desirable to cover this portion.
[0027]
According to a sixth aspect of the present invention, in the protective cover mounting structure in which the plurality of protective covers are arranged in the axial direction of the columnar body, the protective end adjacent to the thin-walled portion of the protective cover whose axial direction end is thinned. The protection cover mounting structure of a columnar body in which the ends of the cover are overlapped and arranged is characterized.
[0028]
That is, when the columnar body longer than the width of the protective cover is covered with the protective cover, the protective cover is sequentially arranged in the axial direction of the columnar body to form a long protective cover.
[0029]
In the case of forming such a long protective cover, a method of extending in the axial direction of the columnar body while overlapping ends of adjacent protective covers is adopted.
[0030]
When the protective cover structure is installed in seawater, seawater will enter the protective cover from this part, and a gap is likely to be formed at the end where the protective cover overlaps. The spoilage attached to this gap grows and spreads, causing damage to the protective cover.
[0031]
Therefore, if at least one end portion of the protective covers to be overlapped is thinned, no gap is generated in the overlapping surface, so that the above-described inconvenience can be prevented.
[0032]
The invention described in claim 7 is characterized in a protective cover mounting structure in which the columnar body is a steel pipe pile of a harbor or a river structure.
[0033]
The protective cover mounting structure of the present invention can be widely used for makeup or anticorrosion of the atmospheric part such as utility poles, signal lights, foundation pillars of buildings and civil engineering structures, and for anticorrosion of the ground parts of the above structures.
[0034]
Above all, it is most suitable for use as a protective cover for protection of clothing such as piers and dolphins exposed to severe corrosive environments, such as underwater or splash zones of steel pipe piles of harbors or river structures.
[0035]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the protective cover mounting structure of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view including a development view of the protective cover mounting structure of the present invention in which a plurality of protective covers are arranged on a steel pipe pile of a harbor structure. FIG. FIG. 3B is a cross-sectional view showing a state in which the overlapped portion of the wound protective cover is brought into close contact with a locking device, and FIG. 3B is a thin-walled portion of the protective cover in which a tube axial end is thinned. FIG. 4 is a longitudinal sectional view showing a state in which an end portion of an adjacent protective cover is overlapped with the end portion.
[0036]
After a base material such as tannin is applied to the outer periphery of the steel pipe pile 18 in advance, a petrolatum-based paste tape 19 is wound thereon, and a petrolatum-based anticorrosion tape 20 is further wound thereon to provide a petrolatum-based anticorrosion layer 21.
[0037]
A cushioning material 12 made of foamed polyethylene is adhered to the inner surface of the protective cover 11 except for the tip. The upper end of the protective cover 11 is formed with a thin processed portion b which is processed to be thinner than the cover main body a. The material of the protective cover 11 is a soft FRP.
[0038]
Next, a process of attaching the protective cover will be described. First, an underwater-curable epoxy resin adhesive 13 is applied to a portion of the protective cover 11 to which the cushioning material 12 is not attached, and then the petrolatum anticorrosion layer is applied so that the adhesive applied surface overlaps the opposite end of the protective cover 11. Wrap from above 21.
[0039]
A lashing belt is attached around the protective cover 11 wound around the petrolatum anticorrosion layer 21 at appropriate intervals, and the protective cover 11 is temporarily fixed.
[0040]
Next, it is wound and temporarily fixed so that the lower end of the upper protective cover 11 overlaps the thinned portion b of the temporarily fixed protective cover 11. The steps up to temporary fixing of the upper protective cover 11 are the same as those of the lower protective cover 11, and a description thereof will be omitted.
[0041]
Next, an adhesive is applied, holes are drilled at appropriate intervals using a drill or the like in a portion where both ends of the upper and lower protective covers 11, 11 are overlapped, and a titanium rivet pin 14 (a flange 14a and a shaft 14b) is formed in each hole. (Mandrel), which is inserted into a prepared hole of a fastening base material, and the shaft 14b is pulled in by operating a tool, thereby deforming the distal end portion A of the flange 14a on the back side of the base material. On the back side of the material, the tip A of the flange 14a is deformed into a hump shape to hold the fastening, and the shaft 14b is cut to complete the fastening.
[0042]
When the titanium rivet pin 14 is compressed using a rivet gun or the like, the tip of the titanium rivet pin 14 is expanded as shown in FIG.
[0043]
Next, the joining portions of the protective covers 11 and 11 at both ends with the titanium rivet pins 14 are sealed with a joining portion sealing material 15 (water-curable epoxy resin).
[0044]
Further, a portion where the upper end of the protective cover 11 is in contact with the lower surface of the concrete structure 22 is sealed with an upper end sealing material 16 (water-hardening epoxy resin) so that rust juice from the steel pipe 18 does not drip.
[0045]
The boundary between the lower end of the protective cover 11 and the steel pipe 18 is sealed with an underwater-curable epoxy resin, and the lower fixing bracket 17 is attached to prevent the protective covers 11 from falling off.
[0046]
The lashing belt that has been temporarily fixed to the protective covers 11 and 11 is removed after the protective covers are attached.
[0047]
【The invention's effect】
Since the present invention is configured as described above, the protective cover structure of the present invention has a simple structure and a simple mounting process, and can be used for underwater and soil such as utility poles, civil engineering / building foundation pillars, buried pipes in the soil, and water pipe bridges. It is possible to easily and inexpensively cover columns, such as pipes, columns, and foundation piles, which are installed in the middle, in the atmosphere, and at the boundary between these, for the purpose of corrosion prevention and makeup.
[0048]
Further, when the protective cover structure of the present invention is used for a steel pipe pile or the like of a harbor structure, since there is no projection such as a flange portion, there is a very small possibility that foreign materials such as driftwood will collide and be damaged, and the protective cover In the case where the cushioning material is interposed, the possibility is further reduced.
[0049]
Furthermore, since the protective cover structure is simple, construction on site is easy, and because the protective cover structure is less prone to gaps, it prevents the anticorrosive material impregnated in the anticorrosive material from leaking out. A stable anticorrosion effect can be obtained over a wide range.
[Brief description of the drawings]
FIG. 1 is a detailed development view of a protective cover mounting structure of the present invention.
FIG. 2 is an enlarged plan sectional view of an encircled line A in FIG.
FIG. 3 is an enlarged vertical sectional view of an encircling line B in FIG. 1;
FIG. 4 is a cross-sectional view showing a conventional protection cover mounting structure.
FIG. 5 is an end view showing another conventional protective cover mounting structure.
[Explanation of symbols]
1; protective cover 2; cover plate 2a; one end 2b; other end 3; angle 4; angle 5; steel pipe pile 6; anticorrosion 7; bolt 8; nut 9; cover body 9a; abdomen 9b; 10; Flange portion 11; Protective cover 12; Buffer material 13; Adhesive 14; Titanium rivet pin 15; Seal material 17; Fixing bracket 18; Steel pipe 19; Paste tape 20; Corrosion protection tape 21; Corrosion protection layer 22; ; Tip part a; cover body b; thin-walled processing part

Claims (7)

In a protective cover mounting structure of a columnar body which is wound around a columnar body or an anticorrosion material on the columnar body or the anticorrosion material on the columnar body and tightened and fixed,
That the overlapping portion of the protective cover is tightly fixed to the columnar body by a locking tool whose end is deformed and expanded when an external pressure inserted in a through hole formed in the overlapping portion is deformed and expanded. Features a protective cover mounting structure for pillars. 2. The protective cover mounting structure according to claim 1, wherein an adhesive is applied to an overlapping portion of the protective cover. 3. The structure according to claim 1, wherein a cushioning material is interposed between the protective cover and the column or the anticorrosive material on the column. 4. The mounting structure according to claim 3, wherein the cushioning material is attached to the protective cover. The protective cover mounting structure for a columnar body according to claim 1, wherein an exposed portion of the locking member is blindfolded. In a protective cover mounting structure in which a plurality of protective covers are arranged in the axial direction of a columnar body, a thinned portion of a protective cover whose axial direction end is thinned and an end of an adjacent protective cover are arranged in an overlapping manner. The protective cover mounting structure for a columnar body according to claim 1, wherein: 7. The protection cover mounting structure for a columnar body according to claim 1, wherein the columnar body is a steel pipe pile of a harbor or a river structure.

Images