JPH07292999A - Method for repairing corroded steel-pipe pole pedestal - Google Patents

Abstract

PURPOSE:To enhance operability and to shorten construction period by boring slots for long-size bar-shaped reinforcement and for a hardenable composition in positions higher than the broken part of a pedestal, and hardening the hardenable composition surrounding the long-size bar-shaped reinforcement. CONSTITUTION:Sots 11, 12 for inserting reinforcement and/or a hardener are drilled through the portion of a broken pedestal 3 above the broken portion 7. The broken portion 7 of the pedestal 3 serves as a hole to adjust the position of the reinforcement inside the pedestal 3, and after the reinforcement is inserted through the slot 11, the broken portion is taped to inject the hardener and to prevent the hardener from flowing out. Thereafter, the hardener is injected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a steel pipe handrail column leg installed in an outdoor part of an apartment house such as a mansion, and a method of repairing a steel pipe column leg of an outdoor physical education facility or a playground facility. The present invention relates to a method for repairing a steel pipe column base that has been corroded by sunlight and wind and rain, and has been damaged or has become defective.

[0002]

2. Description of the Related Art For example, a steel material is often used for an outdoor handrail such as an apartment house such as a mansion or a public building facility. However, the handrail made of this steel material is rusted by wind and rain for many years, corrodes and becomes defective, and if the corrosion reaches the inside, a defective portion literally occurs. The main part of the column base is the position at which the rainwater is accumulated or the region where the damage occurs, that is, the lowermost portion where rainwater easily accumulates, that is, the position near the upper portion of the head part shown in FIG. Naturally, the handrail having such a defect must not be left unattended for the safety of human life, and it is desired to repair each column base having the defect as soon as possible.
By the way, as a repairing method, there is no conventional method that is easy and easy and reliable, and a method of replacing the handrail itself with a new one is mainly used. However, this replacement work is a large-scale work on the veranda part, which requires a long construction period and a large construction cost. Further, since the whole work is replaced, even if there is a column base that requires partial repair, it will be left until the entire repair period, which is not desirable for safety.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention does not replace the handrail itself of the column base portion having the defective portion with a new one, but rather constructs the individual column base portions having the defective portion or the defective portion. It is intended to create a method for surely repairing with simple and easy work without needing to do so. Further, similarly, the present invention is to create a method for reliably repairing a corroded and missing steel pipe column base portion of an outdoor playground facility by a simple and easy work without requiring a construction period. Is.

[0004]

As a result of numerous experiments on the above problems, the present inventors have found that the above problems can be achieved by the following repair methods. That is, the present invention is a curable composition (hereinafter abbreviated as a curing agent) in which an elongated long rod-shaped reinforcing material (hereinafter abbreviated as a reinforcing material) is arranged in a column base extending above and below a defective portion of a steel pipe column base. (2) is filled and hardened to repair the defective portion, wherein the reinforcing material and the hardening agent are opened at a position higher than the defective portion of the column base, and the reinforcing material and the hardening material are hardened from the insertion opening. A method of repairing a column base made of steel pipe, characterized in that a hardening agent is hardened in a state that the reinforcing agent is included therein.

The object of the present invention is not only the column base having a defective portion which has already been pierced by rusting, but also the defective column which is not suitable as a protective fence or a facility column pier even before the hole is formed. It is needless to say that the repair of a damaged column base is also the subject, but in this specification, in order to avoid complicated words, a column base already having a defect and a column base having a defective region are included. Is simply described as a column base having a defect.

[0006]

[Operation] A conventional replacement method (work to re-install the foundation anchor bolts) by partially crushing and cutting open the installation part such as the balcony part where the column base is installed and fixed to replace the entire column base ) On the other hand, this method does not require the work of the foundation of the installation part such as the veranda where the column base is installed and fixed, and the work of inserting the reinforcing material and the curing agent only in the column base having the defective portion. The construction period is 1/1 compared to the conventional method.
Not only can it be shortened to 5 to 1/20, it will also be very useful for ensuring the privacy of residents by shortening the construction period, and the repair cost can also be reduced to 1/5 to 1/7. In addition, the conventional method does not cause the concrete crushed material to fall due to the crushing and opening work of the foundation part, and it is possible to scatter and drop by drilling holes in the column bases that have a defect site and inserting reinforcing material and hardening agent into the holes. Since it is basically a non-existent method, it is highly safe to the surrounding area and downstairs. In addition, the column bases of outdoor physical education facilities and playground facilities can be individually repaired, and the repair period and cost can be reduced.

The present invention will be described in more detail below with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an installation portion of a handrail column base installed on a veranda part, where reference numeral 1 is indoors, reference numeral 2 is a veranda, and reference numeral 3 is an iron steel pipe pillar base of a handrail installed on the veranda 2. Indicates a part. As shown in the drawing, a base plate 4 is fixed to the veranda 2 via anchor bolts 5 embedded in the veranda 2, and the lower ends of the column bases 3 of the handrail are connected to the base plate 4. Further, the combined column base portion is configured such that the lower end portion thereof is normally pressed down by about 100 mm from the surface of the veranda by a head 6 surrounding the periphery. The location where the column base portion 3 is corroded by wind and rain to cause a defect is usually a neighboring portion where the column base portion 3 is exposed from the head 6 to the surface.

By the way, the conventional repair of the column base portion 3 having this defective portion is a new replacement of the whole handrail (column base portion) as described above, and the veranda 2 is crushed and the foundation anchor bolt 5 is re-installed. It is a work that must be started from this, of course, it is not possible to work only on the balcony, scaffolding work, covering the balcony side surface of the house, crushing the veranda, peeling work, crushing, peeling Even after installing the new handrail, it is necessary to at least perform plastering work to align the installed part of the balcony with the non-installed surface part, and the scaffolding removal work after these works. However, such construction work has various problems in terms of construction period, cost, and safety.

FIG. 2 is a schematic cross-sectional view showing the installation portion schematically showing the inside of the column base portion 3 repaired by the method of the present invention. According to the present invention, as described above, the location where the column base portion 3 is damaged by wind and rain to cause a defect is usually located near the upper portion of the head wooden body 6 where the column base portion 3 is exposed from the surface of the wooden body 6. It was made in view of the fact that it is a place to do. That is, according to the present invention, if the reinforcing body 8 can be fixed in the column base portion of the column base portion 3 having the defect portion 7 vertically around the defect portion 7, the column base portion 3 at the defect portion 7 can be fixed. It is based on the idea that it can resist bending stress.

In the repairing method of the present invention, as shown in FIG. 2, the reinforcing member 8 is arranged above and below the defective portion 7 of the column base 3 as a center. In addition to simply disposing the agent 9, a stiffening material 10 in an expanded state is disposed in the stiffening agent 9 in a dispersed state so as to be bonded to the hardening agent 9, and the stiffening material 9 in which the stiffening material 10 in the stretched state is arranged. Is made to exist as a strong resistance against bending stress by allowing the column base 3 to exist above and below the column base 3 in a combined state with the column base above and below it.

In order to check the bending strength of the curing agent 9 in which the reinforcing material 10 in a stretched state is dispersed and included, as shown in the cross-sectional view of FIG. 3, 10 to 40 stretched reinforcing materials 10 are included in a dispersed state. A plurality of cured rod-shaped materials (reinforcing bodies) made of the hardened curing agent 9 were prepared, and the bending strength was subjected to a model test shown below. The reinforcing material 10 used in the model test was composed of 8 main denier 7200 denier polyvinyl alcohol fibers (hereinafter abbreviated as PVA fibers).
Similarly, two 7200 denier PVA fibers were obliquely wound, impregnated with epoxy resin and cured, and the diameter was 3 mm and the length was 160.
The rod-shaped material in a stretched state of mm has a tensile strength of 82 kg / mm ² , elongation of 5.2%, and Young's modulus of 2650 kg / mm ² . The curing agent 9 is "polymortar" manufactured by Kowa Kasei (a resin mainly composed of an epoxy resin and a curing agent added, and the resin and the curing agent are 3:
1) was used. Both were inserted and filled in a molding frame, left to cure for 3 days, and then taken out from the frame.

Each of the reinforcing bodies obtained above had a diameter of 38.1 mm, and two points of the cured rod-shaped material, namely,
Two points having a length of 130 mm were horizontally supported by an adapter having the same arc as that of the rod-shaped article, a load was applied to the center point of the rod-shaped article, and the deflection against the load was measured. This measurement used an autograph (HS = 1.0 m / min) manufactured by Shimadzu.
The bending-deflection curve is shown in FIG. The outer diameter of the structural steel pipe used for general handrails is 42.7 mm,
The inner diameter is 38.1 mm, and the diameter of the above-mentioned cured rod is
It is adapted to the inner diameter of this steel pipe. As shown in FIG. 4, the bending stress of the cured rod-shaped article containing only the resin without the fiber reinforcement and the ten reinforcements is unsatisfactory, but when 20 or more reinforcements are arranged, the bending stress is increased. It can be seen that the stress becomes sufficiently high.

Therefore, according to the present invention, as described above, the characteristics of the reinforced hardened rod-like material may be reinforced at the position of the defective portion of the steel pipe column base portion having the defective portion.
To this end, the inventors have studied how to form a reinforced hardened rod at the internal position of the defective portion, and arrived at the present invention. That is, the present invention, by forming a hardened rod-shaped body made of a curable composition in which the reinforcing material in the stretched state is disposed in a dispersed state, in a column base portion having a defect portion,
Even if a bending load is applied to the defective portion, the column base portion can sufficiently bear the load, and the problem is to be solved by a simple and easy operation.

FIG. 5 is a sectional view of the column base 3 installation portion for explaining the construction method of the method of the present invention. In the figure,
The missing portion 7 of the column base 3 is a portion corresponding to a position immediately above the headstock body 6. In this method of repairing a defect of the column base 3, first of all, according to the present invention, a reinforcing material 10 and / or a hardening agent 9 to be inserted later is inserted by a drill or the like above the defective part 7 of the column base 3 which is missing. The insertion ports 11 and 12 are opened. Considering that the positions of the insertion ports 11 and 12 must be loaded with the reinforcing material 10 and the hardening agent 9 of at least about 10 cm in the respective vertical directions centering on the defective portion 7 of the column base 3, the defective portions are considered. It may be provided at a position 10 cm or more above the portion 7.

The openings of the openings 11 and 12 are about 6 to 10 for the insertion of the reinforcing material 10 and the hardening agent 9.
It suffices to drill a hole having a diameter of mm with a drill or the like. In addition, in the case of FIG. 5, the insertion port 11 for the reinforcing material 10 and the insertion port 12 for the curing agent 9 are separately provided, but this insertion port is common for both insertions. That is, it may be one insertion port.

The curing agent 9 to be inserted may be a room temperature curing type curing resin mainly composed of, for example, an epoxy resin, or a thermosetting resin such as a vinyl ester resin or an unsaturated polyester resin, polyethylene, polypropylene or the like. Although it may be a thermoplastic resin, or may be a hydraulic material represented by ordinary cement or mortar, the defective portion of the target portion is provided under the condition that the reinforcing material 10 in the stretched state is arranged. It is sufficient if it is capable of exhibiting a stress equal to or higher than that of a steel pipe without steel.

The reinforcing material 10 to be inserted is an inorganic fiber such as glass fiber, carbon fiber or the like, or a so-called high-performance high-performance fiber such as vinylon fiber, acrylic fiber, polyethylene fiber, wholly aromatic polyester fiber or para-aramid fiber. Further, steel fibers, and generally used reinforcing bars, PC steel, and the like can be mentioned, but it is not particularly limited, but it is necessary to consider a combination that does not deteriorate the characteristics of the curing agent 9 or take measures. is there.

Among the rod-shaped reinforcing materials used here, as the organic fibers, those having high strength and low elongation are more preferable,
Further, it is desirable to disperse the curing agent 9 in a long and extended state as much as possible. The elongated shape may be a rod-shaped material in which the monofilament is simply focused, but the focused filament is formed into a braided shape, or the focused filament (core filament) is further concentrated around the filament. It is more desirable to form the rod-shaped material in a state of being obliquely wound, since the surface thereof can be formed into an uneven shape, whereby the physical bond with the curing agent 9 can be further enhanced. In particular, since the above-mentioned high performance fibers, especially PVA fibers, the filaments formed on the rod-shaped material having an uneven surface such as the above-mentioned braided shape or oblique winding shape have low cost and low elongation, It is more suitable as the reinforcing fiber of the present invention.

The fibers constituting these reinforcing members 10 do not need to be unnecessarily high in strength, but the curing agent 9 in the column base 3 is not required.
What is necessary is just to be filled with and to have a desired bending characteristic. In that sense, the ratio between the reinforcing material 10 and the curing agent 9 may be appropriately selected. However, if the reinforcing material 10 is used in a relatively large amount within a range where the curing agent 9 can flow down, the reinforcing material 10 is 1
It is naturally distributed evenly in the entire column base portion 3 without being biased to one place.

The missing portion 7 of the column base portion 3 also serves as a hole for adjusting the arrangement of the reinforcing material 10 in the column base portion 3.
After being inserted through the insertion port 11, the hardener 9 is inserted so as to prevent the hardener 9 from flowing away. After preventing this washout, the curing agent 9 is inserted and filled. After the insertion and filling, a curing time is required until the hardening agent 9 is hardened, but the repair work of the present invention is as described above and is extremely simple and easy. If necessary to make the surface of the defective portion 7 inconspicuous, a separate mounting operation may be performed. Further, it is desirable that the insertion openings 11 and 12 be separately sealed in order to prevent the inflow of rainwater.

[0021]

EXAMPLES The present invention will be described more specifically below with reference to examples, but the present invention is not limited thereto. Example 1 The following model test corresponding to a general handrail column leg was conducted. That is, first, the outer diameter is 42.7 m.
m, structural steel pipe with an inner diameter of 38.1 mm, length 1500 m
It was cut in two at the center of m. A partition plate adjusted to the inner diameter was attached to the inside of a position 55 mm from the cut end of the one cut steel pipe so that the reinforcing material and the hardening agent to be inserted later did not leak. (This partition plate corresponds to the base plate that supports and fixes the lower end of the handrail post on the veranda.) Also, a 10 mm diameter drill is used at a position 55 mm from the cut end of the other steel pipe. I made a hole. The two steel pipes were temporarily fixed so that the distance between the two cut ends was 20 mm, and they were installed vertically. 20mm apart
Between the cut ends, a cover sheet was attached to the periphery so that the curing agent would not leak later.

The same reinforcing material and hardening agent as those used in the above-mentioned bending test were put in through the opening hole of the installed steel pipe. 40 reinforcements were added and the length was 130mm
(That is, the length from the partition plate to reach the opening),
The curing agent was also charged and filled until it reached the opening hole. (1) Reinforcing material: PVA fiber 7200 denier, a rod-shaped material in which the same PVA fiber 7200 denier and two fibers are wound around eight fibers in an oblique manner. The tensile strength of the rod-shaped material is 8
2 kg / mm ² , elongation 5.2%, Young's modulus 2650
kg / mm ² . (2) Hardener; Kowa Kasei's "polymortar" (curable resin mainly composed of epoxy resin, resin and its hardener 3: 1)

After the above-mentioned charging, the steel pipe was left to stand for 3 days to be cured, and a bending test of the steel pipe was conducted. This bending test is centered at 20 mm between the cut ends of the steel pipe, and 50 mm to the left and right from the center point.
2 points, that is, two points having a length of 100 mm were horizontally supported by an adapter having the same arc as the steel pipe, a load was applied to the center point, and the strain at that time was measured. This measurement is made by Shimadzu Autograph (HS = 1.0 mm / min, CS = 2
5 mm / min) was used.

The test results are shown in FIG. As shown in FIG. 6, it is confirmed that the steel pipe in which 40 reinforcing members are arranged and reinforced with the hardening agent has the bending stress equivalent to that of the steel pipe made of iron, that is, the column base portion of the handrail.

[0025]

EFFECT OF THE INVENTION The repair method of the present invention is used as a repair method for handrails having corroded steel pipe column bases, and as a repair method for corroded steel pipe facilities in similar outdoor gyms and playground facilities. It ’s easy and the construction period is very short.
The cost can be greatly reduced and the safety during the construction period is good.
Also, in terms of repair material, the performance after repair is stable for a long period of time. That is, the present invention is an extremely excellent invention for practical use.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an installation part of a general handrail column leg installed outdoors such as a veranda.

FIG. 2 is a schematic cross-sectional view showing a column base installation portion schematically showing an internal state inside the handrail column base 3 after repairing by the method of the present invention.

FIG. 3 is a cross-sectional view of a rod-shaped object made of a curing agent 9 in which reinforcing materials 10 are dispersed and arranged.

FIG. 4 is a load-deflection characteristic curve diagram of a rod-shaped object made of the curing agent 9 in which the reinforcing material 10 is dispersedly arranged and a rod-shaped object made of the curing agent 9 in which the reinforcing material 10 is not disposed.

FIG. 5 is a cross-sectional view of a column base installation portion for explaining a construction method of the repair method of the present invention.

FIG. 6 is a load-deflection characteristic curve diagram of the test piece obtained in the example of the present invention.

[Explanation of symbols]

 1 Indoor 2 Veranda 3 Pillar part of handrail 4 Base plate 5 Anchor bolt 6 Barrel 7 Defect 8 Reinforcement 9 Curable composition (Curing agent) 10 Long fiber reinforcement (reinforcement) 11 in stretched state Fiber reinforcement Insertion port for curable composition 12

Claims (1)

[Claims] 1. A method for repairing a defective portion by filling and curing a curable composition comprising elongated rod-shaped reinforcing members in an elongated state in the column base extending above and below the defective portion of a steel pipe column base, the method comprising: The insertion opening of the long rod-shaped reinforcing material and the curable composition is opened at a position higher than the defective portion of the column base, and the long rod-shaped reinforcing material and the curable composition are inserted from the insertion opening, A method of repairing a steel pipe column base, which comprises curing the curable composition in a state where a long rod-shaped reinforcing material is included.