JP2002276201A - Reinforcing method of existing hollow strut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce an existing hollow strut such as pole or the like. SOLUTION: Aggregates are introduced and filled into the internal space (hollow part 2) of a boundary part 5 of a prescribed length H extending between the ground part 3 and underground part 4 of the hollow strut (pole 1) raised on the ground with the base end part buried in the ground from an opening 8 provided on the ground part 3. A two-liquid reactive hardenable resin is then injected and filled in the aggregate filling part, and the hardened resin is integrated to the aggregates and the strut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing an existing hollow column.

[0002]

2. Description of the Related Art Existing hollow poles, such as electric poles, which are erected at the roadside with the base end buried in the ground, are damaged by natural disasters such as typhoons and earthquakes, collisions with automobiles, and aging due to long-term use. When the strength is reduced due to the formation of the ground, the external force may cause breakage at the boundary between the ground portion and the underground portion where the maximum bending acts.

[0003] When such a situation is anticipated, in the past, the pillars were replaced or the boundaries were reinforced by winding an iron plate from the outside, but the pillars are replaced.
Material costs and construction costs will increase, and the construction period will be long.In addition, if the boundary is reinforced from the outside, the reinforcement only on the ground is incomplete and the underground will be reinforced. In addition, there is a problem that it is necessary to excavate the buried portion or to provide a temporary material so that the column does not fall down during the construction, and the construction becomes large.

[0004]

SUMMARY OF THE INVENTION The problem to be solved by the present invention (object of the present invention) is that it does not have the problems as in the prior art described above, and that it has a predetermined structure extending over the above-ground portion and the underground portion of the existing hollow column. It is an object of the present invention to provide a method of reinforcing an existing cylindrical column that can relatively easily and economically reinforce the boundary between the lengths and reliably prevent breakage thereof.

[0005]

In order to solve the above-mentioned problems, in the method of the present invention (the method according to claim 1), it is hollow and has a base end portion buried underground to stand upright on the ground. After introducing and filling the aggregate from the opening provided at the appropriate height of the ground part into the internal space of the boundary part of the appropriate length that spans the underground part of the strut and the ground part, the two liquids are filled in this aggregate filling part. A reactive hardening resin is injected and filled to integrate the hardened resin, the aggregate and the support.

In the method of the present invention, a two-component solution comprising a main solution containing a silicic acid component and a curing agent solution containing 4,4-diphenylmethane diisocyanate has a viscosity of 2000 MPa or less at room temperature. It is preferable to use a reactive curing resin (the method according to claim 2).

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Existing hollow columns to which the method of the present invention is applied include steel poles and electric poles made of centrifugal reinforced concrete.

In the method of the present invention, as the aggregate to be charged and filled into the boundary portion, coarse particles of industrial waste such as slag, crushed concrete and the like similar to concrete gravel and crushed stone are used. Can be made, but the particle size is 3
About 25 mm is desirable.

In the method of the present invention, as the two-part reactive curing resin, for example, a two-part reactive curing resin comprising a base solution comprising a bisphenol type liquid epoxy resin and a curing agent solution containing a component such as polyamidoamine or modified polyamine. Base resin solution consisting of epoxy resin, polyester polyol and polyether polyol and toluene diisocyanate
A two-pack reaction type polyurethane resin or the like comprising a curing agent solution containing an active isocyanate component such as 4-diphenylmethane diisocyanate can be used.

In particular, the mixture comprises the above-mentioned main solution containing a silicic acid component and a curing agent solution containing 4,4-diphenylmethane diisocyanate.
The two-part reactive curable resin of not more than 00 megapascals has a low viscosity of the mixed solution, and when used in combination with an appropriate aggregate, sufficiently fills the gap between the aggregates to form a hard cured body only. It adheres well to the inner wall of the column, especially when the column is made of concrete, a strong binding force is generated by the chemical reaction between the silicate component in the resin and the alkali component of the concrete, and it is reliably integrated with the frame of the column This is preferable because it has the property of

Examples of the solution containing a silicate component include a water glass solution mainly containing an alkali metal silicate such as sodium silicate, potassium silicate and lithium silicate, and a solution of colloidal silica and alkoxysilane alone or two or more kinds thereof. And mixtures thereof.

In order to facilitate the mixing of the main solution and the curing agent solution of the two-pack reaction type curing resin in advance, and to facilitate the penetration and filling of deteriorated portions (cracks, etc.) of the columns, A plasticizer such as dibutyl phthalate or dioctyl phthalate or a high boiling point solvent can be added to such an extent that the curing reaction is not hindered and the properties of the cured product are not deteriorated.

The mixing of the base solution and the curing agent solution of the two-pack reaction type curing resin and the injection and filling of the mixed solution into the application site can be easily performed by utilizing a dedicated machine.

The injection of the mixed solution is generally performed by press-fitting with a pump or by suction under a negative pressure. However, the viscosity of the mixed solution of the two-component reactive curing resin is extremely low. It may be a natural drop type (pour) injection from a container.

In FIG. 1, which is an explanatory view of an embodiment of the method of the present invention, reference numeral 1 denotes an existing electric pole made of centrifugal reinforced concrete, 2 denotes a hollow portion of the electric pole 1, 3 denotes a ground portion of the electric pole 1, and 4 denotes an electric pole. 1 is an underground portion, 5 is a boundary portion having a predetermined length extending between the ground portion 3 and the underground portion 4, 6 is a filler filled in the hollow portion 2 below a lower limit of the boundary portion 5, and 7 is a filler material of the boundary portion 5. The aggregate is filled in the hollow portion 2, and H indicates the length of the boundary portion 5.

In carrying out the method of the present invention in the case shown in the drawing, first, an opening 8 is provided in a peripheral wall at an appropriate height position (a position above the upper limit of the boundary portion 5) of the ground portion 3, and a hollow portion is formed from the opening 8 2 is filled into the hollow portion 2 below the boundary portion 5.
The filling material 6 is filled in the inside, and then the aggregate 7 is put into the hollow portion 2 from the opening 8, and the boundary portion 5 is filled with the aggregate 7.

The filler 6 facilitates the filling of the boundary portion 5 with the aggregate 7, and the two-part reactive curing resin to be injected and filled into the boundary portion 4 later is preferably below the boundary portion 5. In order not to go to, the hollow portion 2 below the lower limit of the boundary portion 5 is filled in advance, and generally, for example, fine particles such as fine sand having a smaller particle size than the aggregate 7 are used. Used.

After the boundary portion 5 is filled with the aggregate 7 as described above, the mixed liquid of the two-component reactive curing resin is press-fitted into this portion from the opening 9 provided in the ground portion of the ground portion 3 with a pump. I do.

The mixed liquid of the two-component reaction-type cured resin injected moves up and down while filling the gap between the aggregates 7, and eventually,
The lower part of the filler 5 slightly penetrates into the layer of the filler 6 beyond the lower limit of the boundary part 5, and the upper part slightly overflows on the layer of the aggregate 7. Stop press fitting.

The mixed liquid of the two-part reactive curing resin filled in the boundary portion 5 as described above hardens eventually, and the cured resin, the aggregate and the frame of the utility pole 1 are integrated. At this time, if there is a crack (crack) leading to the hollow part 2 in the utility pole body at the boundary part 5, the mixed liquid of the two-part reactive curing resin enters the crack and hardens, and the crack is closed and repaired.

In order to securely close the cracks in the power pole skeleton of the ground portion 3, an appropriate form is wound around the outside of the crack and a negative pressure is applied to the inside of the form to allow the inside of the hollow 2 to be closed. It is also conceivable to positively suck the mixed liquid of the two-part reactive resin into the crack.

[Brief description of the drawings]

FIG. 1 is a sectional view for explaining an embodiment of the method of the present invention.

[Explanation of symbols]

1: telephone pole, 2: hollow part, 3: ground part, 4: underground part, 5:
Boundary, 6: filler, 7: aggregate, 8: opening, 9: opening.

Continuation of the front page (71) Applicant 599007082 Nikka Construction Co., Ltd. 4025 Nakajima, Kisarazu-shi, Chiba (72) Inventor Masayuki Kurose 9-9 Ienocho, Nagasaki-shi, Nagasaki Taiyo Technology Development Co., Ltd. (72) Invention Person Masashi Tanno 1-5-5 Taito, Taito-ku, Tokyo Inside Fudo Kenken Co., Ltd. (72) Inventor Isamu Suho 1406 Shimoizumi, Sodegaura City, Chiba Prefecture Nikka Construction F-term (reference) 2D046 DA36 2E176 AA00 BB29

Claims (2)

[Claims] 1. An internal space at a boundary of a predetermined length extending between a ground portion and an underground portion of a pillar which is hollow and has a base end portion buried in the ground and erected on the ground. After filling and filling the aggregate from the opening provided at the position, the two-part reactive curing resin is injected and filled into this aggregate filling part, and the cured resin, the aggregate and the support are integrated. Characteristic method of reinforcing existing hollow columns. 2. A base solution containing a silicic acid component, and 4.4-
2. A two-part reaction type cured resin comprising a curing agent solution containing a diphenylmethane / diisocyanate component and having a viscosity of a mixed solution of 2000 MPa or less at room temperature.
The reinforcing method of the existing hollow support described in the above.