JP2004360250A - Repair device and repair method for corroded portion of steel pipe column underground - Google Patents

Abstract

An object of the present invention is to provide an apparatus for repairing an underground corroded portion of a steel pipe column, which has a simple and robust structure and is highly reliable.
An underground part (2) of a steel pipe column (1) is surrounded by two semicircular covers (3a, 3b) having a diameter larger than that of the steel pipe column (1), and both end edges thereof are hinged to each other to be aligned with the same vertical line. The connecting small-diameter steel pipe 4 is provided so as to be vertically displaced on the opposite side as described above, and either one of the upper and lower ends of one of the opposed semicircular covers 3a, 3b and the other semicircular cover 3a, 3b The short connecting small-diameter steel pipes 5a and 5b that are hingedly assembled are welded to either of the upper and lower ends of both end edges, and the stop pins 6 with heads are inserted into the respective connecting small-diameter steel pipes 4, 5a and 5b that are assembled in a hinged manner. Then, both ends of the two semicircular covers 3a, 3b are joined to form the cylindrical repair cover 3, and the gap 10 between the steel tube column 1 and the filler 11 is filled with the filler 11.
[Selection] Figure 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus and a method for repairing an underground corrosion portion of an existing steel pipe column mainly used for various purposes such as a power pole and a lighting pole.
[0002]
[Prior art]
There are two types of steel pipe columns: a single steel pipe is processed into a column as it is, and a tubular type is formed by joining respective tubular components to form a single column. When it is difficult to transport a single steel pipe, it is necessary to transport each component of the prefabricated steel pipe post to assemble the post at the site. Usually, these steel pipe columns are hot-dip galvanized on the inner and outer surfaces, and are expected to have a long service life.
[0003]
The characteristics of steel pipe columns are as follows: (1) lightweight and easy to transport; (2) easy to build; (3) easy removal and relocation; (4) long life; and assembling steel pipe columns (5). ▼ Easy storage, 6) Easy replacement of components. However, this steel pipe column cannot avoid the problem of corrosion at the ground edge due to long-term use, and its repair has been conventionally performed by various methods. Four typical examples of the conventional repair technology are given below.
[0004]
{Circle around (1)} The stainless band type is a method in which the area around the base of the steel pipe column is excavated widely and two half bands are tightened with the stainless band, but the strength of the stainless band is a problem. In addition, the stainless steel band tends to cause corrosion. In addition, it is necessary to excavate the area around the ground.
[0005]
(2) The bolted type is a method in which the area around the ground is excavated widely and two half bands are fastened with bolts and nuts. However, the bolts and nuts are likely to cause corrosion. In addition, bolts and nuts protrude, causing a problem in safety for pedestrians in some places, and furthermore, processing of the bolts and nuts is costly. Furthermore, it is necessary to excavate the area around the ground.
[0006]
(3) The welding type is a method in which two half-bands are welded on site at the top of the ground, integrated and then lowered, and mortar is filled in the gap with the steel pipe column. Challenges remain in anticorrosion repair. Attention must be paid to fire caused by welding on site. Further, in some cases, field welding cannot be performed depending on the area or weather, such as in a residential area or in a strong wind.
[0007]
(4) The countersunk bolt type is a method in which two half-bands are integrated with a countersunk bolt above the ground and then lowered, and mortar is filled in the gap between the steel pipe column. Drilling and threading are costly.
[0008]
Other examples include JP-A-7-324496 (Patent Document 1), JP-A-9-287318 (Patent Document 2), and JP-A-2002-152555 (Patent Document 3). Patent Document 1 discloses that a steel pipe is arranged in such a manner that pin holes of connection metal fittings provided on the upper and lower sides of each half reinforcing pipe are aligned with each other, and a connecting pin is inserted into the pin hole to connect the two half reinforcing pipes. The mortar is filled in the gap between the pillars.However, there are disadvantages such as a large half-reinforced pipe, complicated structure and high manufacturing cost, and difficulty in filling the mortar due to obstruction of each fitting. Yes, and there is also a concern about strength.
[0009]
Patent Document 2 discloses a method of forming a sheath column by bolting flanges formed by bending outwardly to the ends of each semi-cylindrical body, and filling a gap with a steel tube column with mortar or the like. Similar to the bolted type described in (2), there are problems such as corrosion of the bolt and nut and safety due to outward projection. Patent Document 3 discloses a method in which each semi-cylindrical body surrounds the outer periphery of a power pole, and the outer circumference is fastened with a stainless steel band to fill a gap between the power pole and the cylindrical body with a filler. Similar to the stainless steel band type described in 1 ▼, there are the problems of the strength of the stainless steel band and the problem of easily causing corrosion.
[0010]
[Patent Document 1]
JP-A-7-324496 [Patent Document 2]
JP-A-9-287318 [Patent Document 3]
JP 2002-152955 A
[Problems to be solved by the invention]
The conventional repair device has a problem that the structure is complicated and that welding work and bolt fastening work take time, which results in high material cost and construction cost.
[0012]
An object of the present invention is to provide a repair device and a repair method for a steel pipe column that have solved the above-mentioned problems.
[0013]
[Means for Solving the Problems]
To achieve the above object, the present invention is configured as follows.
[0014]
According to a first aspect of the present invention, there is provided an apparatus for repairing a corroded portion in which a ground portion of a steel pipe column is surrounded by a cylindrical repair cover having a diameter larger than that of the steel pipe column, and a filler is filled in a gap therebetween. Is composed of two semicircular covers, and the two ends of each semicircular cover are combined with each other in a hinged manner, and the connecting small-diameter steel pipes are shifted up and down on opposite sides so that they are aligned on the same vertical line. Then, a stop pin with a head is inserted into each connecting small-diameter steel pipe combined with each other to connect both end edges of the two semicircular covers.
[0015]
According to a second aspect of the present invention, in the first aspect, there is provided a short-circuit that is hingedly engaged with one of the upper and lower ends of the opposite semicircular cover and one of the upper and lower ends of the other semicircular cover. The small diameter small diameter steel pipe is welded, and the small diameter small diameter steel pipe and the short diameter small diameter steel pipe are arranged so as to protrude only inside the semicircular cover and are welded to both edges of the cover.
[0016]
In a third aspect based on the first or second aspect, the stop pin with the head has a threaded portion at a tip end, and a nut is fastened to the threaded portion projecting from the lower small-diameter steel pipe for short connection. It is characterized by having.
[0017]
According to a fourth aspect of the present invention, the two semicircular covers according to the first to third aspects of the present invention are hinged at the upper part of the steel pipe column to form a cylindrical repair cover. After being pushed down, a filler is filled in a gap between the steel pipe column and the cylindrical repair cover.
[0018]
[Action]
ADVANTAGE OF THE INVENTION According to this invention, the corrosion of the underground part of a steel pipe column can be repaired by the simplest method, the catastrophe by this kind of collapse of a steel pipe column can be prevented beforehand, and especially, the cost required for repair and the cost required for rebuilding are reduced. Becomes possible. Furthermore, the connecting small-diameter steel pipe is welded to the inside of the cover so that it does not protrude outside the cylindrical repair cover, and the upper and lower ends of the cover are short at the ends so that the upper and lower ends of the cover do not become weak points despite the hinge connection. The problem was solved by welding small diameter steel pipes for connection. Further, the construction time is further reduced, and the strength and reliability are improved.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIGS. 1 to 3 show a first embodiment, and FIG. 1 is a perspective view showing a state in which a periphery of an underground portion 2 of a steel pipe column 1 is surrounded by a cylindrical repair cover 3 according to the first embodiment. .
[0021]
2A and 2B are a plan view and a side sectional view of a semicircular cover, and FIG. 3A is a diagram of an inner side surface and a stop pin of one of two semicircular covers, and FIG. ) Is a plan view of the semicircular cover, and FIGS. 3C and 3D are an inner side view of the other of the two semicircular covers and a plan view of the semicircular cover.
[0022]
In each of the drawings, the cylindrical repair cover 3 has two semicircular covers 3a and 3b made of a steel plate having a larger diameter than the steel pipe column 1 and having a predetermined width and length. The inner and outer surfaces of the semicircular covers 3a and 3b are subjected to necessary rustproofing.
[0023]
The two ends of the two semicircular covers 3a, 3b are vertically shifted on opposite sides so as to be aligned on the same vertical line by being combined with each other in a hinged manner, and on the outside of the semicircular covers 3a, 3b. The connecting small diameter steel pipe 4 is fixed by welding 12 so as not to protrude.
[0024]
Further, when the connecting small-diameter steel pipes 4 are provided so as to be vertically displaced on opposite sides in a hinged arrangement, the connecting small-diameter steel pipes 4 are present on both of the opposite upper and lower end edges of the two semicircular covers 3a, 3b. When the filler is filled in the gap between the cylindrical repair cover 3 and the steel pipe column 1 in a later step without performing, the upper and lower edges of the semicircular covers 3a and 3b may be expanded. For this reason, in this invention, the short diameter small diameter steel pipes 5a and 5b for short dimension connection are welded 12 to the upper end part of both ends of one semicircular cover 3a and the lower end part of both ends of the semicircular cover 3b on the other side. It is stuck.
[0025]
Therefore, the pair of semicircular covers 3a and 3b face each other, and the connecting small-diameter steel pipe 4 and the short-diameter connecting small-diameter steel pipes 5a and 5b at both ends are aligned so as to be aligned on the same vertical line. A stop pin 6 with a part is inserted into each guide pipe from above and assembled in a hinge manner. The stop pin 6 with a head uses a round bar of 10 to 16 mm and has a screw portion 7 at the tip, and a nut is fastened to the screw portion 7 protruding from the small diameter small diameter steel pipe 5b for short connection. As a result, the tubular repair cover 3 having a larger diameter than the steel pipe column 1 is formed without falling out. Instead of fastening a separate nut to the screw portion 7, the lower short-diameter steel pipe 5b for short connection may be constituted by a nut.
[0026]
The pair of semicircular covers 3a and 3b may be separated and conveyed to the site, and the stop pin 6 with the head may be passed through the connecting small-diameter steel pipes 4, 5a and 5b to combine the both edges simultaneously. Alternatively, only the edges on one side of the semicircular covers 3a and 3b are hingedly connected and transported to the site with both covers closed, and the semicircular covers 3a and 3b are opened at the site to remove the steel pipe column 1. After being surrounded, the other side edge may be connected by a stop pin 6 with a head. In this case, work on site can be reduced.
[0027]
At the time of the repair work, the ground 14 is excavated at least to the extent that the cylindrical repair cover 3 is fitted around the ground for placing the steel pipe column 1 to expose the underground portion 2, and the excavated portion 13 is used to make use of the excavated portion 13. A predetermined process is performed by removing dust and adhered matter on the outer peripheral surface and applying a rust preventive paint. Thereafter, the ends of the semicircular covers 3a and 3b are joined together at the upper portion of the steel pipe column 1 using the stop pins 6 with heads to assemble the cylindrical repair cover 3 and then pulled down. The underground part 2 is surrounded with a gap 10. The cylindrical repair cover 3 has a height (ground height) of the corroded steel pipe column 1 from the ground of about 10 to 50 cm, an underground depth of about 10 to 50 cm, and a diameter of 40 to 60 mm from the diameter of the steel pipe column 1. Make the diameter slightly larger.
[0028]
Thereafter, the gap 10 between the steel pipe column 1 and the cylindrical repair cover 3 is filled with a filler 11 such as mortar. The filler 11 may be a material that can withstand compressive force, such as a mortar, a fast-curing polymer cement, a time-curable filler such as an epoxy resin, or a material having elasticity such as rubber. When the filling material 11 is filled, a spreading force acts on the semicircular covers 3a and 3b, but the welding small-diameter steel pipes 4, 5a and 5b are connected to both end edges of the covers by stop pins 6 with heads. As a result, both end edges of the two semicircular covers 3a, 3b are firmly connected to the upper and lower ends, and are not inadvertently expanded or damaged by the pushing force of the filler 11.
[0029]
4 and 5 show a second embodiment, in which FIGS. 4 (a) and 4 (b) are a plan view and a side sectional view, and FIG. 5 (a) is one of two semicircular covers. (B) is an inside view of the other of the two semicircular covers.
[0030]
The basic configuration of the second embodiment is the same as that of the first embodiment. The configuration that is different from the first embodiment is different from the first embodiment in that a part of the connecting small-diameter steel pipe 4 is partially outside the semicircular covers 3a and 3b. The point is that it is set up for business trips. Although the second embodiment does not include the small-diameter steel pipes 5a and 5b for short connection in the first embodiment, a configuration in which these are provided may be employed. The other configuration of the second embodiment is the same as that of the first embodiment, and the same components are denoted by the same reference numerals and the description thereof will not be repeated.
[0031]
In addition, it is within the scope of the present invention that the configuration shown in each embodiment is appropriately changed in design and implemented.
[0032]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the corrosion of the underground part in a steel pipe column can be repaired by the simplest method, and the catastrophe by this kind of collapse of a steel pipe column can be prevented beforehand. In particular, the present invention provides a tubular repair cover by connecting the two semicircular covers in a hinged manner by inserting a stop pin with a head into a steel pipe connecting small diameter steel pipe fixed to both side edges of the two semicircular covers. With the configuration, the configuration is simple, and the cost required for repair and the cost required for rebuilding can be reduced, and the construction time can be reduced. Also, by welding short connecting small diameter steel pipes to the upper and lower ends of the semicircular cover, the strength of the upper and lower ends of the joining edge of the cylindrical repair cover can be further improved.
[0033]
In addition, the cylindrical repair cover can be made strong and robust regardless of the hinged connection structure, and is damaged even if the expanding force acts on the cylindrical repair cover via the filler filling the gap between the tubular repair cover and the steel pipe column. There is no danger of reliability and reliability is improved. Furthermore, by welding the small-diameter steel pipe for connection to the inside of the side edge of the cover so that it does not protrude outside the two semicircular covers, there is no risk of pedestrians walking near the steel pipe pillar tripping over the protruding part of the repair part, and safety Can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view in which the periphery of a ground portion of a steel pipe column is surrounded by a tubular repair cover of the present invention.
FIGS. 2A and 2B are a plan view and a cross-sectional view of a semicircular cover.
3A is an inner side view of one of two semicircular covers and a view of a stop pin, FIG. 3B is a plan view of the semicircular cover, and FIGS. 3C and 3D are two semicircular covers. It is the other inner side view of a circular cover, and the top view of a semicircular cover.
FIGS. 4A and 4B are a plan view and a side sectional view of a semicircular cover according to a second embodiment.
FIG. 5A is a view of one inside surface and a view of a stop pin of two semicircular covers according to a second embodiment, and FIG. 5B is a view of the other inside surface of the two semicircular covers. .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel pipe column 2 Ground part 3 Cylindrical repair cover 3a Semicircular cover 3b Semicircular cover 4 Connecting small diameter steel pipe 5a Short connecting small diameter steel pipe 5b Short connecting small diameter steel pipe 6 Headed stop pin 7 Screw section 10 Gap 11 Filling material 12 Welding 13 Drilling part 14 Ground

Claims (4)

A corroded portion repairing device that surrounds an underground portion of a steel pipe column with a cylindrical repair cover having a diameter larger than that of the steel pipe column, and fills a gap with a filler, wherein the cylindrical repair cover includes two semicircular covers. The two ends of each semicircular cover are joined together in a hinged manner and the connecting small-diameter steel pipes are welded by shifting the position up and down on the opposite side so that they are aligned on the same vertical line. An apparatus for repairing an underground corrosion portion of a steel pipe column, characterized in that a stop pin with a head is inserted into a small-diameter steel pipe for connection and both ends of the two semicircular covers are connected. One of the upper and lower ends of the opposite semicircular cover and one of the upper and lower ends of the other semicircular cover are welded to a short-diameter connecting small-diameter steel pipe that is hingedly joined to one of the upper and lower ends of the other semicircular cover. 2. Corrosion at the ground of a steel pipe column according to claim 1, wherein the small-diameter steel pipe and the small-diameter steel pipe for short connection are arranged so as to protrude only inside the semicircular cover and are welded to both ends of the cover. Part repair equipment. 3. The steel pipe column according to claim 1, wherein the stop pin with a head has a screw portion at a tip, and a nut is fastened to the screw portion protruding from a small diameter small diameter steel pipe at a lower portion. 4. Equipment for repairing corroded parts near the ground. After the two semicircular covers according to any one of claims 1 to 3 are hinged together at the upper part of the steel pipe column to form a cylindrical repair cover, the cylindrical repair cover is pushed down to the ground portion, and then And filling a gap between the steel pipe column and the cylindrical repair cover with a filler.

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