JP4033804B2 - Repair equipment and method for repairing corroded steel pipe columns - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a repairing device and a repairing method for a corroded portion of an existing steel pipe column used mainly for various applications such as a power pole and a lighting column.
[0002]
[Prior art]
There are two types of steel pipe pillars: one that processes a single steel pipe into a pillar as it is, and another that is an assembly type that joins tubular structural members into one pillar. When one piece is long and difficult to carry, each component member of the assembling type steel pipe pillar is carried and assembled at the site to constitute the pillar. 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 listed as follows: (1) Lightweight and easy to transport, (2) Easy to construct, (3) Easy to remove and relocate, (4) Long life, and 5 ▼ Easy storage, ⑥ Easy replacement of members. However, this steel pipe column also cannot avoid the problem of corrosion at the ground due to long-term use, and has been repaired by various methods. Here are four examples of conventional repair techniques.
[0004]
(1) The stainless steel band type is a method of excavating the periphery of the steel pipe column wider and tightening the two half bands with a stainless steel band, but the strength of the stainless steel band is a problem. In addition, the stainless steel band tends to cause corrosion. Furthermore, it is necessary to excavate around the border.
[0005]
(2) The bolt tightening type is a method of excavating a wide area around the ground and fastening two half bands with bolts and nuts, but the bolts and nuts are likely to cause corrosion. In addition, the bolt and nut part protrudes, and depending on the location, there is a problem in safety for pedestrians, and further, the cost of processing the bolt and nut part is high. Furthermore, it is necessary to excavate around the border.
[0006]
(3) Welding type is a method in which two halved bands are welded and integrated at the site above the ground, then lowered and filled with mortar between the steel pipe columns. Problems remain in anticorrosion repair. Also, be careful of fire caused by on-site welding. Furthermore, there are cases where field welding is not possible depending on the area and weather, such as in residential areas and during strong winds, and these reasons cause costly field welding.
[0007]
(4) The countersunk bolt type is a system in which two halved bands are integrated with a countersunk bolt at the top of the ground and then lowered, and mortar is filled in the gap between the steel pipe column. Drilling and threading are expensive.
[0008]
In addition, there are JP-A-7-324496 (Patent Document 1), JP-A-9-287318 (Patent Document 2), JP-A 2002-152955 (Patent Document 3), and the like. Patent document 1 arrange | positions so that the pin hole of each connection metal fitting provided in the inner upper and lower sides of each half reinforcement pipe may match, inserts a connection pin in the pin hole, couple | bonds both half reinforcement pipes, The gap between the pillars is filled with mortar, etc., but there are problems such as the half-reinforcement pipe is large, the structure is complicated and the manufacturing cost is high, and each connecting bracket becomes an obstacle, making it difficult to fill mortar etc. There are also concerns about strength.
[0009]
In Patent Document 2, a sheath column is formed by bolting flanges that are bent outward at the end of each semi-cylindrical body, and mortar or the like is filled in a gap between the steel tube column. ] Similar to the bolt tightening type described in (2), there are problems such as corrosion of the bolt and nut portions and safety due to protrusions on the outside. In Patent Document 3, each semi-cylindrical body surrounds the outer periphery of the electric pole, and the outer periphery is fastened with a stainless steel band, and the gap between the electric pole and the cylindrical body is filled with a filler. [0004] ▲ Similar to the stainless steel band type described in 1), there are problems with the strength of the stainless steel band and the tendency to cause corrosion.
[0010]
[Patent Document 1]
JP-A-7-324496 [Patent Document 2]
JP-A-9-287318 [Patent Document 3]
Japanese Patent Laid-Open No. 2002-152955
[Problems to be solved by the invention]
The conventional repair device has a complicated structure and has a problem that it takes time for welding work and bolt fastening work, which incurs material costs and construction costs.
[0012]
An object of this invention is to provide the repair apparatus and repair method of the steel pipe pillar which solved the said problem.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows.
[0014]
1st invention is the corrosion part repair apparatus which surrounds the ground part of a steel pipe pillar with the cylindrical repair cover larger diameter than this steel pipe pillar, and is filled with the filler in the gap | interval, Comprising: The said cylindrical repair cover Is composed of two semi-circular covers, and welded to each end of each semi-circular cover is a small-diameter steel pipe with a vertical shift on the opposite sides so that they are aligned on the same vertical line by being combined with each other in a hinged manner. The connecting small-diameter steel pipes are arranged so as to protrude only inside the semicircular cover, and upper ends of both end edges of the opposite semicircular cover and both ends of the opposite semicircular cover. The connecting small diameter steel pipe located at the lower end of the edge is configured as a short connecting small diameter steel pipe shorter than the connecting small diameter steel pipe, and a stop pin with a head is inserted into each connecting small diameter steel pipe Both of the two semi-circular covers And wherein the bound edge.
[0015]
According to a second invention, in the first invention, the diameter of the cylindrical repair cover constituted by the two semicircular covers is 40 to 60 mm larger than the diameter of the steel pipe column surrounded by the cylindrical repair cover. Features.
[0016]
According to a third invention, in the first or second invention, the stop pin with a head has a threaded portion at a tip, and a nut is fastened to the threaded portion protruding from the lower small-diameter steel pipe for connection. It is characterized by being.
[0017]
According to a fourth aspect of the present invention, after the two semicircular covers according to the first to third aspects are hinged at the upper part of the steel pipe column to form a cylindrical repair cover, the cylindrical repair cover is connected to the ground part. Then, a filler is filled in a gap between the steel pipe column and the cylindrical repair cover.
[0018]
[Action]
According to the present invention, it is possible to repair the corrosion of the submerged portion of the steel pipe column by the simplest method, and it is possible to prevent the disaster caused by the collapse of this type of steel pipe column, and in particular, to reduce the cost required for repair and the cost required for rebuilding. Is possible. Furthermore, the small-diameter steel pipe for connection is welded to the inside of the cover so that it does not protrude to the outside of the cylindrical repair cover, and the end is short so that the upper and lower ends of the cover do not become weak points in strength despite the hinge connection. The problem was solved by welding small diameter steel pipes for connection. Furthermore, construction time is shortened, and strength and reliability are improved.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0020]
1 to 3 show the first embodiment, and FIG. 1 is a perspective view showing a state in which the periphery of the ground portion 2 of the steel pipe column 1 is surrounded by the cylindrical repair cover 3 according to the first embodiment. .
[0021]
2 (a) and 2 (b) are a plan view and a side sectional view of the semicircular cover, FIG. 3 (a) is an inner side view of one of the two semicircular covers, a view of the stop pin, and FIG. 3 (b). ) Is a plan view of the semicircular cover, and FIGS. 3C and 3D are the other inner side view of the two semicircular covers and the plan view of the semicircular cover.
[0022]
In each figure, the cylindrical repair cover 3 is composed of two semicircular covers 3a and 3b made of a steel plate having a diameter larger than that of the steel pipe column 1 and having a predetermined width and length. Necessary rust prevention treatment is applied to the inner and outer surfaces of the semicircular covers 3a and 3b.
[0023]
The two semicircular covers 3a and 3b are shifted to the opposite ends of the two semicircular covers 3a and 3b so as to be aligned on the same vertical line by being combined with each other in a hinge manner, and on the outer sides of the semicircular covers 3a and 3b. The connecting small diameter steel pipe 4 is fixed by welding 12 so as not to protrude.
[0024]
Further, when the small-diameter steel pipe 4 for connection is provided by shifting the position up and down on the opposite side in the hinge type arrangement, the small-diameter steel pipe 4 for connection exists at both the upper and lower end edges of both the semicircular covers 3a and 3b. Without filling the gap between the cylindrical repair cover 3 and the steel pipe column 1 in the subsequent process, the upper and lower edges of the semicircular covers 3a and 3b may expand. For this reason, in the present invention, short diameter connecting small-diameter steel pipes 5a and 5b are welded 12 to the upper ends of both end edges of one semicircular cover 3a and the lower ends of both end edges of the opposite semicircular cover 3b. It is fixed.
[0025]
Accordingly, the pair of semicircular covers 3a and 3b are faced to each other, and the small diameter steel pipe 4 for connection and the small diameter steel pipes 5a and 5b for short connection at the both ends are positioned so as to be aligned on the same vertical line, The stop pin 6 with a part is inserted into each guide pipe from above and combined in a hinged manner. The stop pin 6 with a head uses a round bar of 10 to 16 mm, has a threaded portion 7 at the tip, and fastens a nut to the threaded portion 7 protruding from the lower short connecting small diameter steel pipe 5b. Thus, the cylindrical repair cover 3 having a diameter larger than that of the steel pipe column 1 is formed without coming out upward. Instead of fastening the nut of another member to the screw portion 7, the lower short-diameter connecting small diameter steel pipe 5b may be constituted by a nut.
[0026]
The pair of semi-circular covers 3a, 3b may be separated and transported to the site, and the head-attached stop pin 6 may be passed through the connecting small-diameter steel pipes 4, 5a, 5b to combine both edges at the site. Alternatively, only one side edge of the semicircular covers 3a and 3b is hinged and transported to the site with both covers closed, and the semicircular covers 3a and 3b are opened on the site to open the steel pipe column 1 In addition, the other end edge portion may be coupled by the stop pin 6 with the head, and in this case, the work at the site can be reduced.
[0027]
In the repair work, the ground 14 is excavated around the place where the steel pipe column 1 is placed at least as long as the cylindrical repair cover 3 can be accommodated to expose the ground portion 2. A predetermined treatment is performed by removing dust or sticking on the outer peripheral surface and applying a rust preventive paint. Then, the edge of both sides of the semicircular covers 3a and 3b is joined using the stop pins 6 with heads in the upper part of the steel pipe column 1 and assembled downward after the tubular repair cover 3 is assembled. The ground portion 2 is surrounded with a gap 10. The cylindrical repair cover 3 has a corroded steel pipe column 1 having a height (ground height) from the ground of about 10 to 50 cm, a depth of about 10 to 50 cm, and a diameter of 40 to 60 mm from the diameter of the steel pipe column 1. Use a slightly larger diameter.
[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. In addition to mortar, the filler 11 may be a material that can withstand compressive force, such as a fast-curing type polymer cement, a time-curable filler such as an epoxy resin, or an elastic material such as rubber. By filling the filler 11, a spreading force acts on the semicircular covers 3a, 3b, but welded small-diameter steel pipes 4, 5a, 5b are joined to both ends of the cover by stop pins 6 with heads. As a result, both end edges of the semicircular covers 3a and 3b are firmly coupled across the upper and lower ends, so that they are not inadvertently expanded or damaged by the force of push-opening by 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. An inner side view and a view of a stop pin, (b) is the other inner side view of two semicircular covers.
[0030]
The basic configuration of the second embodiment is the same as that of the first embodiment, and the mainly different configuration is that in the second embodiment, a part of the connecting small-diameter steel pipe 4 is outside the semicircular covers 3a, 3b. This is a business trip. In addition, in 2nd Embodiment, although the short diameter connection small diameter steel pipe 5a, 5b in 1st Embodiment is not comprised, it is good also as a structure which provides this. The other configuration of the second embodiment is the same as that of the first embodiment, and the same elements are denoted by the same reference numerals and redundant description is omitted.
[0031]
In addition, it is included in the scope of the present invention to appropriately change the design of the configuration shown in each embodiment.
[0032]
【The invention's effect】
According to the present invention, it is possible to repair the corrosion of the underground portion of the steel pipe column by the simplest method, and it is possible to prevent a disaster caused by the collapse of the steel pipe column. In particular, the present invention provides a cylindrical repair cover by connecting two semicircular covers in a hinged manner by inserting a stop pin with a head into a small pipe for connection made of steel pipe fixed to both side edges of the two semicircular covers. Since it is configured, 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 shortened. Moreover, the strength of the upper and lower ends of the joining edge of the cylindrical repair cover can be further improved by welding a short connecting small-diameter steel pipe to the upper and lower ends of the semicircular cover.
[0033]
In addition, the tubular repair cover can be constructed to be strong and robust regardless of the hinged connection structure, and it will be damaged even if the expansion force acts on the tubular repair cover via the filler filled between the steel pipe columns. The reliability is improved. Furthermore, by welding the small-diameter steel pipe for connection to the inside of the cover side edge so that it does not protrude outside the two semicircular covers, there is no risk that pedestrians walking near the steel pipe column will go to the protruding part of the repair part. Can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view in which the periphery of a steel pipe column is surrounded by a cylindrical repair cover of the present invention.
FIGS. 2A and 2B are a plan view and a cross-sectional view of a semicircular cover, respectively.
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 FIG. 3C and FIG. It is the other inner side view of a circle cover, and a top view of a semicircle cover.
FIGS. 4A and 4B are a plan view and a side sectional view of a semicircular cover according to a second embodiment.
5A is an inner side view of one of two semicircular covers and a stop pin according to the second embodiment, and FIG. 5B is an inner side view of the other of the two semicircular covers. .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel pipe pillar 2 Ground part 3 Cylindrical repair cover 3a Semicircle cover 3b Semicircle cover 4 Small diameter steel pipe 5a for connection Small diameter steel pipe 5b for short length connection Small diameter steel pipe 6 for short length connection Stop pin 7 Screw part 10 Clearance 11 Filler 12 Welding 13 Excavation part 14 Ground

Claims (4)

A corroded portion repair device for surrounding a steel pipe column with a cylindrical repair cover having a diameter larger than that of the steel pipe column, and filling the gap with a filler, the cylindrical repair cover having two semicircular covers The semi-circular covers are welded to the connecting small- diameter steel pipes at both ends of each semicircular cover by shifting the positions up and down on opposite sides so that they are aligned on the same vertical line by being combined with each other in a hinged manner. Steel pipes are arranged so as to protrude only inside the semicircular cover, and are arranged at upper ends of both end edges of the opposite semicircular cover and lower ends of both end edges of the opposite semicircular cover. The connecting small-diameter steel pipe is configured as a short-diameter connecting small-diameter steel pipe shorter than the connecting small-diameter steel pipe, and the stop pins with heads are inserted into the connecting small-diameter steel pipes , which are combined with each other. Combined both ends of the circle cover Door corrosion part repair device when the land of the steel pipe columns and said. The diameter of the cylindrical repair cover composed of the two semicircular covers is 40 to 60 mm larger than the diameter of the steel pipe column surrounded by the cylindrical repair cover. Corrosion part repair device.   The steel pipe column according to claim 1 or 2, wherein the stop pin with a head has a threaded portion at a tip, and a nut is fastened to the threaded portion protruding from a small-diameter steel pipe for short connection at a lower part. Equipment for repairing corroded areas on the ground.   After the two semicircular covers according to any one of claims 1 to 3 are hinged 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 part, and thereafter A method for repairing a corroded portion of a steel pipe column at the ground, wherein a filler is filled in a gap between the steel pipe column and a cylindrical repair cover.

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