JP2009270401A - Reinforcing method of metallic hollow column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To fill and adhere a curing resin in a column, while leaving water as it is, in a method for reinforcing the column by removing the water left in the metallic hollow column with a lower end part embedded in concrete. <P>SOLUTION: A hole is bored in the hollow column above an embedding part into the concrete. The curing resin having density higher than the water and superior in adhesion with a wetting surface, is injected from its hole. The staying water is made to flow out of the hole while substituting the staying water in the hollow column with the curing resin. The curing resin is filled up to the lower edge height of the bored hole, and the curing resin is made to adhere to the column. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a method for removing water staying in a metal hollow strut with its lower end embedded in concrete and reinforcing the strut. Used for

As this type of repair method, the one disclosed in Patent Document 1 is known.
In this known repair method, a hole for draining is formed in the concrete in which the lower part of the column is embedded, and after the water existing inside is drained, a filler is filled in the column from the injection hole formed in the column. The structure which inject | pours and hardens | cures is employ | adopted.

However, in this method, it is necessary to make a hole in the concrete portion supporting the support column in a state where the staying state of water and the structure of the embedded portion cannot be visually confirmed. Therefore, there is a disadvantage that a hole is made in a portion where water does not stay, or the foundation portion of the column is destroyed.
In addition, if the filler is injected and adhered to the support column to enhance the reinforcing effect, the drained part must be completely dried, which requires a drying period of about 2 to 3 days. Furthermore, since the hole drilled in the concrete portion is closed and dried and hardened, the filling operation is finally started.
Japanese Patent No. 3929386

The present invention relates to a method of reinforcing a column by removing water staying in a metal hollow column having a lower end embedded in concrete, and filling and adhering a curable resin into the column while retaining water. It is a problem to make it possible.

The first technical means to solve this technical problem is: (a) a hole is drilled in the hollow column above the concrete embedded part, and (b) the adhesiveness with the wet surface is higher in density than water. In addition to injecting the curable resin excellent in the hole into the hole, (c) replacing the accumulated water in the hollow column and the curable resin, allowing the accumulated water to flow out of the hole, and (d) drilling the curable resin. (E) bonding the curable resin and the support to the height of the lower edge of the hole.

The second technical means is to inject the curable resin from the bottom side of the hollow column using an injector having a flexible tube attached to the nozzle.
A third technical means is to fill or place the aggregate and / or the rod-shaped reinforcing body in the hollow column before or during the injection of the curable resin in the above method.
In the fourth technical means, when using an injector with a long nozzle, the tip of the nozzle faces the bottom of the hollow column, and then the aggregate and / or the rod-shaped reinforcement is filled or arranged. Injecting a curable resin.

In the first technical means, since a curable resin having a density higher than that of water is injected from a hole formed in the hollow support above the portion embedded in the concrete, the water staying in the hollow support Will be replaced by the heavier resin sinking to the bottom side and pushed up.
As the resin is filled from the bottom side in the hollow support column, the pushed-up retained water is gradually discharged from the hole. When the curable resin is filled to the height of the lower edge of the hole, the discharge of all the accumulated water is completed.
Since the curable resin is excellent in adhesiveness with the wet surface, the resin and the column are securely bonded even when the inner wall surface of the hollow column is wet.
Therefore, the curable resin can be filled and bonded into the support column without going through the water draining process.

In the second technical means, since the curable resin is injected from the bottom side of the hollow support column using an injector having a flexible tube attached to the nozzle, the resin has minimal contact with the accumulated water. As a result, the bottom is directly filled.
Therefore, there is no possibility that water is taken into the injected resin or trapped in the resin, and there is an advantage that the accumulated water is surely pushed up and discharged from the hole.

In the third technical means, since the aggregate and / or the rod-shaped reinforcing body is filled or arranged in the hollow column before or during the injection of the curable resin, it is integrated with the injected curable resin. There is an advantage that the reinforcing effect can be enhanced. There is also an advantage that the shrinkage rate of the entire filling volume can be reduced even if the resin shrinks at the time of curing.

In the fourth technical means, after the tip of the nozzle of the injector faces the bottom of the hollow column, the curable resin is injected by filling or arranging the aggregate and / or the rod-shaped reinforcing body. The functional resin is filled from below the aggregate and the reinforcing body. Therefore, even if an aggregate with a small particle size or a small reinforcing body is used, the resin is reliably filled from the bottom side, and water discharge is not hindered by the aggregate or the rod-shaped reinforcing body. There is no risk of water being taken up or encapsulated in the resin.

As a curable resin excellent in adhesiveness with a wet surface, an epoxy resin type and an acrylic resin type are often used. "Bond (registered trademark) E206", "Bond (registered trademark) E2300J" related to the manufacture of the applicant, "Alpha Tech (registered trademark) 340" manufactured by Alpha Industry Co., Ltd., "WB Grout" manufactured by Showbond Chemical Co., Ltd. Can be preferably used.

As an aggregate to be filled or arranged as a reinforcing material, granular materials such as gravel can be used. Moreover, as a rod-shaped reinforcement body, the rod body which consists of iron, aluminum, etc. can be used.

As a result of filling and bonding the curable resin into the support column without going through the water draining process, there is an advantage that the construction period of the reinforcement work can be greatly shortened.
Also, since the resin is filled up to the position of the lower edge of the drilled hole and adhered to the support, the rainwater that has entered the support from the top of the handrail etc. is received by the top surface of the resin and then drilled. Since there is an outflow through the hole, there is an advantage that water can be prevented from staying in the future.

FIG. 1 is a schematic view for explaining an embodiment of the method of the present invention, and a lower end portion of a hollow column 2 constituting a handrail (not shown) is provided on a concrete support portion 1 formed along an outer edge of a veranda. The embedded state is shown in a sectional view.
Rainwater 4 stays in the column 2 and is going to flow out from the hole 3 formed in the column 2.

A flexible tube 7 is attached to the nozzle 6 of the injector 5, and the cylinder 8 is filled with “Bond (registered trademark) E2300J” as manufactured by the applicant as a wet surface adhesive 10. Yes.
The tube 7 has its tip facing the bottom of the hollow support 2 through the hole. In this state, when the piston 9 of the injector is advanced and the wet surface adhesive 10 is pushed out, the adhesive 10 is removed from the hollow support 2. It fills in the support | pillar 2 from the bottom part side.

Since the density of the adhesive 10 is larger than that of water, the accumulated water 4 is pushed upward as the filling amount of the adhesive 10 into the hollow support 2 increases and eventually flows out of the hollow support 2 from the hole 3 ( (See arrow a). When the adhesive 10 reaches the lower edge of the hole 3, all of the water flows out, and the filled adhesive 10 adheres to the support column while curing.

Schematic for explaining an embodiment of the invention

Explanation of symbols

1 concrete support, 2 handrail hollow struts, 3 holes drilled, 4 water staying in the struts, 5 adhesive injector, 6 injector nozzle, 7 flexible tube, 8 injection Cylinder, 9 injector piston, 10 wet surface adhesive

Claims (4)

In the method to reinforce the strut by removing the water staying in the metal hollow strut with the lower end embedded in the concrete, a hole is drilled in the hollow strut above the buried portion, and the density is higher than water A curable resin with excellent adhesion to the wet surface is injected from the hole, and the stagnation water is allowed to flow out from the hole while replacing the stagnation water and curable resin in the hollow column, and the curable resin is drilled. A method for reinforcing a hollow column in which the hole is filled to the height of the lower edge and the curable resin and the column are bonded. The method for reinforcing a hollow column according to claim 1, wherein a curable resin is injected from the bottom side of the hollow column using an injector in which a tube having flexibility is attached to a nozzle. The method for reinforcing a hollow column according to claim 1 or 2, wherein an aggregate and / or a rod-shaped reinforcing body is filled or arranged in the hollow column before or during the injection of the curable resin. The reinforcement of the hollow column according to claim 2 or 3, wherein the curable resin is injected by filling or arranging the aggregate and / or the rod-shaped reinforcement after the tip of the injector nozzle faces the bottom of the hollow column. Method.

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