JP4811684B2 - Repair method for metal hollow struts - Google Patents

Description

  The present invention relates to a method for repairing a metal hollow column such as a handrail column installed on a concrete frame such as a veranda, a balcony, or an outer corridor of an apartment house, or a fence column installed on an outer frame.

  FIG. 4 shows a conventional general handrail 22 erected on a concrete housing 21 such as a veranda, a balcony, and an outer corridor of an apartment house. The handrail 22 is configured by appropriately assembling a headboard 23, an upper chord material 24, a lower chord material 25, a handrail element (lattice) 26, a hollow column 27, and the like, and the column 27 is embedded in the concrete frame 21. These members are made of aluminum alloy or steel, and the column 27 is a metal hollow column made of a hollow material (for example, a square pipe, a round pipe, etc.).

  When the column 27 of the handrail 22 is an aluminum alloy hollow column, a reinforcing steel pipe is inserted and fixed inside the lower column of the hollow column in order to maintain the standing strength. When this handrail 22 is attached to a veranda or the like and exposed to wind and rain for several years or more, the joint of the headboard 23 and the support 27 and the screw attachment holes of the upper chord member 24 and the lower chord member 25 enter the support 27. Rainwater or condensed water that has entered does not drain and accumulates inside the column. In general, this water is often acidic and rusted.

  For this reason, the steel pipe in the hollow strut deteriorates due to corrosion and rust generation over many years and expands. As a result, cracks are generated in the concrete casing 21 in the strut burying portion, so that water oozes out and the strength of the concrete casing 21 is increased. In order to solve this problem, after removing the water accumulated in the metal hollow strut of the handrail, there is a problem that there is a risk of falling and falling of the standing fixing strength of the strut and causing the risk of falling and falling. A repair method for a metal hollow strut in which a filler is injected into the metal hollow strut has been proposed (see Patent Documents 1 and 2).

The repair method of the conventional metal hollow strut is
(1) A step of drilling a hole in the base of a metal hollow strut embedded and fixed in concrete;
(2) A step of extracting water accumulated in the metal hollow strut from the hole by a suction pump;
(3) After extracting water, it consists of the process which inject | pours curable resin (filler) from a hole with an injection | pouring pump, and is filled in a metal hollow support | pillar (refer patent document 1).
Moreover, in the repair method of a metal hollow support | pillar, the cement-type non-shrink mortar containing a rust preventive and / or a polymer for cement may be used as a filler (refer patent document 2).
Japanese Patent No. 3743721 (Claim 1, Paragraph 0030) Japanese Patent No. 3929386 (paragraph number 0031)

  The conventional method for repairing metal hollow struts is to inject the filler after the water collected in the metal hollow struts has been positively extracted with a suction pump, etc. Therefore, there is a problem that it takes a long time to complete the repair work of the metal hollow strut, especially when repairing the metal hollow strut of the handrail, many handrails are installed in the apartment house. Since there are many columns to be repaired, there is a problem that the repair period becomes longer.

  Therefore, the present invention solves the problems of the prior art as described above, eliminates the work of draining the water accumulated in the metal hollow struts such as existing handrails, and is required for repairing the metal hollow struts. The repair period can be shortened by shortening the time. After repair, for example, even if handrails, fences, etc. are exposed to wind and rain over a long period of time, cracks in the concrete frame due to the occurrence of rust, accompanying it It is an object of the present invention to provide a method for repairing a metal hollow strut that can prevent the standing fixing strength of the strut from being lowered, a handrail, a fence and the like from falling and falling.

  According to the first aspect of the present invention, a water discharge hole is drilled in a lower part of a metal hollow strut that is erected and fixed to a concrete frame, and a vent hole is drilled in a part above the water discharge hole. Simultaneously discharging the water stored in the metal hollow strut from the water discharge hole by injecting and filling the inside of the metal hollow strut with a curable filler having a higher specific gravity than water to the water discharge hole. The above-mentioned problems are solved by using a method for repairing a metal hollow strut that fills the inside of the metal hollow strut with a filler.

  According to a second aspect of the present invention, in the method for repairing a metal hollow strut according to the first aspect, the filler is made of weakly alkaline polymer cement grout mortar.

  According to a third aspect of the present invention, in the method for repairing a metal hollow strut according to the first or second aspect, a hose with a funnel is used in which the filler is inserted into a vent hole formed in the metal hollow strut. It is said that it inject | pours inside this metal hollow support | pillar.

  According to a fourth aspect of the present invention, in the repair method for a metal hollow strut according to any one of the first to third aspects, the metal hollow strut is made of only an aluminum alloy hollow shape member. It is.

  According to a fifth aspect of the present invention, in the method for repairing a metal hollow strut according to any one of the first to third aspects, the metal hollow strut is composed of only a steel hollow shape member. is there.

  According to a sixth aspect of the present invention, in the repair method for a metal hollow strut according to any one of the first to third aspects, the metal hollow strut includes an aluminum alloy hollow shape member and at least the hollow shape member inside the hollow shape member. It is a metal hollow strut having a double structure composed of a steel hollow member provided at a lower position.

  The present invention according to claim 7 is the method for repairing a metal hollow column according to any one of claims 1 to 6, wherein the metal hollow column is a handrail or a fence column.

  According to the first aspect of the present invention, a water discharge hole is drilled in a lower part of a metal hollow strut that is erected and fixed to a concrete frame, and a vent hole is drilled in a part above the water discharge hole. Simultaneously discharging the water stored in the metal hollow strut from the water discharge hole by injecting and filling the inside of the metal hollow strut with a curable filler having a higher specific gravity than water to the water discharge hole. Since the filling material is filled in the lower part of the metal hollow strut, only the water discharge hole is first drilled in the lower part of the metal hollow strut, and the water above the water discharge hole naturally flows out. Next, when a curable filler having a fluidity higher in specific gravity than water is injected and filled into the lower part of the metal hollow column, the water remaining below the water discharge hole is injected into the filler. Pushed up by the water discharge hole It is therefore possible to perform simultaneously the discharge of the filling with water of the filling material. As a result, it is possible to omit the water draining operation that has been conventionally performed, and to shorten the repair period.

  In addition, when the filler is injected into the metal hollow column, even if it is injected above the water discharge hole, the filler will flow out from the water discharge hole, so that the water discharge hole cannot be blocked. As a result, the filling material can be easily injected. After repair, the filler hardens over time, and after hardening, the water that has entered the metal hollow struts and the condensed water are immediately discharged. It is possible to prevent the standing fixing strength from decreasing.

  Furthermore, since a water discharge hole is drilled below the hollow metal column and a vent hole is drilled at a position above the water discharge hole, ventilation is performed well after repair, such as rainwater. Even if it penetrates, it will be discharged from the water discharge hole, and the inside of the metal hollow strut will be kept dry.

  According to the second aspect of the present invention, in addition to the effect exhibited by the metal hollow strut repair method of the present invention according to the first aspect, the filler is made of weakly alkaline polymer cement grout mortar. Therefore, since the slurry-like polymer cement grout mortar having fluidity can be obtained simply by kneading the polymer cement composition with water at the repair construction site, the construction work efficiency can be improved. In addition, since the hardened polymer cement grout mortar cured inside the metal hollow strut is weakly alkaline, the rust of the steel member is retroactively removed by the alkali component, and the rust generation of the metal hollow strut over the years Corrosion can be prevented.

  According to the third aspect of the present invention, in addition to the effect exhibited by the metal hollow strut repair method of the present invention according to the first or second aspect, the filler is perforated in the metal hollow strut. Since the hose with a funnel inserted into the vent hole is used to inject the metal hollow struts to the lower side, the filling material can be injected easily.

  According to the fourth aspect of the present invention, even when the metal hollow strut is made of only an aluminum alloy hollow shape member, the repair of the metal hollow strut such as a handrail and a fence is performed. The effect equivalent to the effect which the repair method of the metal hollow support | pillar of this invention which concerns on any one of 3 shows is show | played.

  According to the fifth aspect of the present invention, even when the metal hollow strut is made only of a steel hollow shape member, for example, in repairing a metal hollow strut such as a handrail or a fence, the first to third aspects of the invention are described. There exists an effect equivalent to the effect which the repair method of the metal hollow support | pillar of this invention which concerns on either of these show | plays.

  According to this invention concerning Claim 6, the said metal hollow support | pillar has the double structure which consists of a hollow shape member made from an aluminum alloy, and the hollow shape made from steel provided at least in the downward position inside this hollow shape member. Even in the case of the metal hollow strut having, the same effect as the effect exhibited by the method for repairing the metal hollow strut of the present invention according to any one of the first to third aspects is exhibited.

  According to the seventh aspect of the present invention, since the metal hollow strut is a handrail or fence post, the metal hollow strut of the handrail or fence is also the present invention according to any one of the first to seventh aspects. The effect equivalent to the effect which the repair method of a metal hollow support | pillar shows is produced.

  The present invention is a method for repairing existing metal hollow struts such as handrails and fences that are erected and fixed to a concrete frame, shortening the repair period and reducing the erection fixing strength of the metal hollow struts after repair. In order to prevent this, the work that has been performed in the two steps of the water draining process and the filling process of the filler as in the past is performed in one process of simultaneously filling the filler and discharging the water. It is what I did.

  A method for repairing a metal hollow column according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1A is a side view of a metal hollow column of a handrail before repairing, FIG. 1B is a front view of the metal hollow column of a handrail, FIG. 2 is an explanatory diagram when filling the filler, and FIG. 3 is filling the filler It is latter explanatory drawing.

  As shown in FIG. 1, a metal hollow column 3 of an existing handrail 2 erected and fixed to a concrete frame 1 includes a hollow shape member 4 made of aluminum alloy and a steel provided below the hollow shape member 4. This is a metal hollow column 3 having a double structure composed of a hollow member 5 made of metal.

  The metal hollow strut 3 has a steel hollow member 5 welded to a fixture 14, and the fixture 14 is welded to an anchor 15 to be fixed upright on the concrete frame 1. In this existing handrail metal hollow strut 3, water W such as rainwater or condensed water that has soaked is collected, but in this embodiment, it is assumed that it has accumulated up to the position of the water surface W1 shown in FIG. explain.

  When repairing the metal hollow strut 3, first, a water discharge hole 7 is drilled with a drill 9 at an appropriate lower portion of the hollow strut 3, preferably between the lower chord material 6 b and the surface 1 a of the concrete housing 1. A vent hole 8 is drilled at an appropriate position above the water discharge hole 7. In this case, whichever of the water discharge holes 7 and the ventilation holes 8 is formed first may be used. In addition, the code | symbol 6a in FIG. 1 is a coping, and 7a, 8a is a water discharge hole and the opening position of a vent hole.

  First, when the water discharge hole 7 is drilled with the drill 9, the water W above the water discharge hole 7 is discharged to the water discharge hole 7. After the discharge of the water W, the water W below the water discharge hole 7 remains in the metal hollow column 3, but here the water is not actively extracted, A curable filler 10 having fluidity higher than that of water is injected and filled up to the water discharge hole 7.

  As the curable filler 10 having fluidity, weakly alkaline polymer cement grout mortar having a high specific gravity and not being dispersed in water is preferable as compared with general grout mortar. In filling the polymer cement grout mortar, the polymer cement composition is kneaded with water to obtain a slurry polymer cement grout mortar having high fluidity. This maintains fluidity for an appropriate period of time, and separation does not occur even at high specific gravity (slurry specific gravity; 2.2 to 3.5). The hardened body of polymer cement grout mortar that can be filled in detail and hardened in a predetermined time has the same strength as normal mortar. This cured body has the characteristics that it is difficult to absorb water due to the mixing of the polymer resin and is weakly alkaline (pH 8 to 10.5), so that the iron portion can be rust-prevented and has little influence on the aluminum material.

In the polymer cement grout mortar characterized by high specific gravity and weak alkalinity, cements such as ordinary Portland cement, blast furnace cement, fly ash cement and the like can be used as a hardening component. As the high specific gravity material, silica particles, garnet, vanadium, alumina, zircon, iron oxide or other particles with high specific gravity (particle size of 0.4 mm or less) are used. As the alkalinity control agent, fly ash, silica fume, etc. that can obtain a pozzolanic reaction, or mineral powders such as gypsum, clay, kaolin, etc. are used to lower the alkali content of the cement. These are appropriately blended, and additives such as a powder resin, an anti-separation agent, a high-performance fluidizing agent, and an anti-shrink agent are added and mixed with powder to obtain a polymer cement composition.
One formulation example of the polymer cement composition is shown in Table 1.

  When filling the polymer cement grout mortar into the metal hollow strut 3, the polymer cement composition (mixed powder) put in the container 13 is kneaded with water at the repair work site of the strut to form a slurry having high fluidity. Next, as shown in FIG. 3, the slurry-like polymer cement grout mortar is poured into the funnel 11 provided in the hose 12 inserted in the vent hole 8 formed in the metal hollow support 3. The hose 12 is allowed to flow naturally, and is poured and filled until the polymer cement grout mortar reaches the water discharge hole 7.

  When the slurry-like polymer cement grout mortar is poured and filled until it reaches the water discharge hole 7 as described above, the discharge of water W and the filling of the polymer cement grout mortar are performed simultaneously. After the injection of the polymer cement grout mortar, the hose 12 is taken out and a removable cap is attached to the water discharge hole 7 and the vent hole 8 as needed. In filling, the polymer cement grout mortar may be injected and filled while the tip of the hose 12 inserted into the vent hole 8 is gradually lifted upward from the bottom of the interior 3 of the metal hollow column.

  As described above, the slurry-like polymer cement grout mortar injected into the metal hollow strut 3 hardens in about 2 hours to become a cured body of the polymer cement grout mortar (cured filler 10a), and stands on the concrete 1 The fixed metal hollow strut 3 is reinforced and discharged from the water discharge hole 7 even if rainwater enters or condensed water is generated thereafter. Moreover, since the hardened body of the polymer cement grout mortar is weakly alkaline, the alkali content is eluted although it is minute, and after repair, even if the inside of the metal hollow strut 3 is wet, rust generation is prevented.

The effect which the repair method of the metal hollow support | pillar of an Example show | plays is demonstrated below.
When the water discharge hole 7 and the vent hole 8 are drilled in the metal hollow strut 3 standingly fixed to the concrete frame 1, the water W accumulated in the metal hollow strut 3 naturally flows out from the water discharge hole 7. Water remains below the water discharge hole 7.

  Slurry polymer cement grout mortar obtained by kneading a predetermined amount of polymer cement composition (mixed powder) with water at the repair site without performing the work of discharging the remaining water with a water absorption pump. Is poured into a funnel 11 provided in a hose 12 inserted in a vent hole 8 drilled in a metal hollow column 3, and the hose 12 is allowed to flow down and injected until the polymer cement grout mortar reaches the water discharge hole 7. Fill. As a result, it is possible to simultaneously discharge the water remaining inside the metal hollow strut and to fill the polymer cement grout mortar, and to shorten the repair work time of the metal hollow strut.

  When injecting and filling slurry polymer cement grout mortar, polymer cement grout mortar having a specific gravity higher than that of general grout mortar slurry is gradually deposited from below the metal hollow strut 3, so that all remaining water W is water. It can be discharged from the discharge hole 7. At this time, even if the slurry-like polymer cement grout mortar is injected up to the top of the water discharge hole 7, it has fluidity, so that it can flow out from the water discharge hole 7 and not block the water discharge hole 7, The injection filling operation can be easily performed.

  The slurry-like polymer cement grout mortar filled inside the metal hollow strut 3 hardens in about 2 hours, and the metal hollow strut 3 standingly fixed on the concrete 1 is reinforced by the cured body of the polymer cement grout mortar. can do. In addition, since the hardened polymer cement grout mortar is weakly alkaline after filling, the rust of the steel member is removed retroactively by the alkali component, preventing rust generation and corrosion of the metal hollow strut for many years. The non-shrinkable grout mortar can prevent cracking of the cured body of the polymer cement grout mortar and prevent water penetration.

  As described above, as a method for repairing the metal hollow strut of the embodiment, the metal hollow strut 3 includes the aluminum alloy hollow profile 4 and the steel hollow profile 5 provided below the hollow profile 4. However, the metal hollow strut 3 may be made of only an aluminum alloy hollow member or a steel hollow member. Further, the metal hollow strut to be repaired may be a hollow strut of a fence other than a handrail.

(A) is a side view of the metal hollow strut of the handrail before repair, (B) is a front view of the metal hollow strut of the handrail. It is explanatory drawing at the time of the filler injection | pouring in this invention Example. It is explanatory drawing after filling with a filler. It is a front view of the conventional common handrail.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete frame 1a Concrete frame surface 2 Handrail 3 Metal hollow support 4 Aluminum alloy hollow shape 5 Steel hollow shape 6a Headwood 6a Lower chord material 7 Water discharge hole 7a Water discharge hole drilling position
8 Vent hole 8a Vent hole drilling position 9 Drill 10 Filler 10a Hardened filler 11 Funnel 12 Hose 13 Container 14 Attachment 15 Anchor W Water W1 Water surface

Claims (7)

  A water discharge hole is drilled in the lower part of the metal hollow strut that is erected and fixed to the concrete frame, and a vent hole is drilled in the upper part of the water discharge hole. By filling and filling the water discharge hole with a curable filler having high specific gravity fluidity, the water accumulated in the metal hollow strut is discharged from the water discharge hole, and at the same time, the filler is put inside the metal hollow strut. A method for repairing a metal hollow strut characterized by filling downward.   2. The method for repairing a metal hollow strut according to claim 1, wherein the filler is made of weakly alkaline polymer cement grout mortar.   The metal hollow strut according to claim 1 or 2, wherein the filler is injected into the inside of the metal hollow strut by a hose with a funnel inserted into a vent hole formed in the metal hollow strut. Repair method.   The method for repairing a metal hollow strut according to any one of claims 1 to 3, wherein the metal hollow strut is made of only an aluminum alloy hollow shape member.   The method for repairing a metal hollow strut according to any one of claims 1 to 3, wherein the metal hollow strut is made of only a steel hollow profile.   The metal hollow strut is a metal hollow strut having a double structure comprising a hollow shape member made of an aluminum alloy and a steel hollow shape member provided at least in a lower position inside the hollow shape member. A method for repairing a metal hollow strut according to any one of claims 1 to 3. The method for repairing a metal hollow strut according to claim 1, wherein the metal hollow strut is a handrail or a fence strut.

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