JPH06323000A - Manufacture of concrete column - Google Patents

Abstract

PURPOSE:To make it possible to install a reinforcing layer of a fiber reinforced composite resin material on the outer surface by pasting resin impregnated fiber reinforced reinforcement on the inner surface of a mold in the circumferential direction and laying out a cage coaxially and casting concrete. CONSTITUTION:The inner surface of each of molds 20a and 20b for a centrifugal casting machine is coated with a releaser so that a resin impregnated fiber reinforced reinforcement 19 is pasted on the inner surface in the circumferential direction. Then, a cylinder-shaped cage 18 is placed into the mold 20b and the other mold 20a is placed upon the other, being supported on the mold 20b coaxially. Then, flange 20c, which place the mold 20a upon 20b respectively, are fastened with bolts 20d, thereby coupling the molds 20a and 20b in one piece. Then, concrete 17 is arranged to flow into the mold 20, rotating the mold 20 and the concrete is expanded into the mold 20 with centrifugal force and spread to the reinforcement 19 gradually. When the concrete is cast into cylindrical shape at a specified thickness, the concrete is cured. Or the resin impregnated into the fiber reinforced reinforcement 19 is used as a fiber- reinforced composite resin material. Then the concrete 17 is removed from the mold 20 and cured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a concrete column such as a utility pole, and more particularly to a method for producing a concrete column having improved elasticity.

[0002]

2. Description of the Related Art Nowadays, concrete poles are used for many electric poles such as power distribution in urban areas and power supply for electric trains. This concrete column is generally formed into a reinforced concrete hollow cylinder structure in which a basket of reinforcing rods woven into a substantially cylindrical shape is used as a core and concrete is struck inside and outside the basket.

By the way, for example, when a vehicle passing through a concrete pillar on a road collides, the concrete pillar bends and then returns to its original vertical posture by elasticity, but when the impact is strong and the bending is large, Since the reinforcing bars are plastically deformed, there is a problem that the concrete columns do not restore to their original posture and remain deformed.

Further, for example, a concrete pillar near the line of a high-speed railway such as the Shinkansen has a problem that the surface of the concrete pillar is worn and damaged due to collision of pebbles and sand wound by the wind pressure of a passing vehicle. .

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
By providing a reinforcing layer for elastic reinforcement with a fiber-reinforced composite resin material around the desired location such as the vertical range centered on the ground level of the outer surface of the concrete column, a large deflection that causes plastic deformation of the inner reinforcing bar It has been attempted to be able to easily restore the original vertical posture in the event of occurrence of.

Further, by providing a reinforcing layer for reinforcing the strength and rigidity of the fiber reinforced composite resin material around a desired portion of the concrete column, and a reinforcing layer for abrasion resistance reinforcing thereon, for a long period of time. Attempts have also been made to withstand abrasion caused by the impact of pebbles and sand, and to continue to improve strength, waterproof and weather resistance.

An object of the present invention is to provide a manufacturing method suitable for manufacturing a concrete column having a reinforcing layer around the desired portion on the outer surface for elastic reinforcement by a fiber reinforced composite resin material. Is.

[0008]

The above object can be achieved by the method for manufacturing a concrete column according to the present invention. In summary, the present invention, after performing the reinforcing fiber reinforcing material impregnated with resin on the inner surface of the substantially cylindrical mold along the circumferential direction, the cage of the reinforcing bar is coaxially arranged and supported in the mold, Then, by pouring concrete into the mold, curing the poured concrete to solidify, to obtain a concrete column having a reinforcing layer of a fiber reinforced composite resin material around the outer surface in the method of manufacturing a concrete column. is there.

According to the present invention, before pouring the concrete into the mold, an amount of polymer cement corresponding to a thickness of 1 to 10 mm can be poured, and then the concrete can be poured. The resin has a solidification temperature of 5
It is a thermosetting resin of 0 ° C. or higher, and the curing of the concrete can be a heating curing of 50 ° C. or higher. Further, the reinforcing fiber reinforcing material can be used by impregnating the resin when it is applied in the mold, or can be used in the form of a semi-cured prepreg pre-impregnated with the resin.

[0010]

FIG. 1 is a sectional view showing an example of a concrete column manufactured by the manufacturing method of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a process showing an example of the method of manufacturing a concrete column of the present invention. It is a figure.

As shown in FIGS. 1 and 2, the concrete pillar 9 manufactured according to the present invention has a reinforcing layer 11 made of a fiber-reinforced composite resin around required places on the outer surface thereof. By using a reinforcing fiber reinforcing material such as a reinforcing fiber sheet for the reinforcing layer 11, the concrete pillar 9
A major feature is that the reinforcing layer 11 is integrally formed at the same time as the manufacturing of the.

The concrete pillars 9 shown in FIGS. 1 and 2 are examples of electric poles, and in order to improve elasticity, the concrete pillar 9 is centered on the surface level (ground level) of the ground 12 in which the concrete pillar 9 is buried. Around the upper and lower parts, the reinforcing layer 11 of the above-mentioned fiber-reinforced composite resin material is provided with the reinforcing fibers 4.
Are provided so as to be oriented in the axial direction of the concrete pillar 9.

When installing the concrete pillar 9 on the ground 12, as shown in FIG.
Concrete 13 around the buried portion 9a in the ground 12 of
Is hit and the concrete 13 is used for hardening.

In the above, when the concrete column 9 is reinforced concrete alone, it loses elasticity at an elongation of about 0.15%, whereas the reinforcing fiber of the reinforcing layer 11 has an elongation of, for example, about 1.5%. By using the carbon fiber having high elasticity, the concrete pillar 9
The elasticity of can be improved, and even if a large bending that causes plastic deformation of the inner reinforcing bar occurs, the elasticity can restore the original vertical posture.

In this case, after the concrete pillar 9 is manufactured, the reinforcing fiber reinforcing material is attached to the periphery of the concrete pillar 9 to form the reinforcing layer 11 of the fiber-reinforced composite resin material. Handling is troublesome,
The cost is also high.

Therefore, according to the manufacturing method of the present invention, the reinforcing layer 11 of the fiber-reinforced composite resin material is integrally formed by using the reinforcing fiber reinforcing material when the concrete pillar 9 is manufactured, and the concrete pillar 9 having the reinforcing layer 11 is obtained. Of.

In the manufacturing method of this embodiment, as shown in FIG. 3, the centrifugal casting method was adopted for manufacturing the concrete columns 9.

As shown in FIG. 3 (a), each mold 2 of a substantially cylindrical mold 20 which is divided into upper and lower parts of a centrifugal casting machine.
A release agent for the resin is applied to the desired location on the inner surface of 0a, 20b, and a release agent for the concrete is applied to other locations, and then the inner surface of the location where the release agent for the resin is applied , Reinforced fiber reinforcement impregnated with resin 19
Attach along the circumferential direction and apply. At this time, the length in the width direction of each reinforcing fiber reinforcing material 19 is half the mold 2
The length of the sheet 19 is slightly longer than half the circumference so that the ends in the width direction of the sheet 19 overlap each other when the sheets 0a and 20b are overlapped.

Then, as shown in FIG. 3 (b), a cylindrical reinforcing steel basket 18 is placed in the lower mold 20b, and is coaxially supported by the lower mold 20b, and then placed on the lower mold 20b. The molds 20a are overlapped, and the basket 18 is also supported by the upper mold. Then, the overlapping flanges 20c of the molds 20a and 20b are tightened with bolts 20d, and the molds 20a and 2b are
0b are joined together.

Then, as shown in FIG. 3 (c), the concrete 17 is gradually poured into the mold 20 while rotating the integrally joined mold 20, and the poured concrete 17 is put into the mold 20 by a centrifugal force. Spread the mold 20
Then, they are sequentially attached inside, and at the places where the reinforcing fiber reinforcing material 19 is provided, they are sequentially attached to the reinforcing material 19. Then, a predetermined amount of concrete 17 is poured, and when the concrete 17 is cast into the mold 20 into a cylindrical shape having a predetermined thickness up to the inside of the basket 18, the mold 20 is continued to rotate and the concrete 17 keeps the cylindrical shape. The concrete 17 is solidified to the extent that it can be
The resin impregnated in the resin is cured to form the reinforcing fiber reinforcing material 19 into a fiber-reinforced composite resin material.

Then, the concrete 17 is poured from the mold 20.
When the concrete 17 is taken out and cured to be completely solidified, as shown in FIGS. 2 and 3, the reinforcing layer 11 of the fiber-reinforced composite resin material by the reinforcing fiber reinforcement 19 is provided around the desired portion on the outer surface. Concrete columns 9 are obtained.

In the above, as the resin to be impregnated into the reinforcing fiber reinforcing material 19, a room temperature curable resin can be used. However, since the room temperature curable resin has a short usable time and is directly cured to lose fluidity. , Pay attention to the usage time,
The adhesiveness between the obtained concrete columns 9 and the reinforcing layer 11 may be weakened.

In order to avoid this, it is preferable to use a heat curing type resin having a solidification temperature of 50 ° C. or higher. Therefore, the curing of the concrete 17 at this time is performed by heating at 50 ° C. or more, and the concrete 17 is cured by being heated by the heater arranged around the mold 20 while continuing to rotate without being taken out from the mold 20. .

Before the concrete 17 is poured into the mold 20, the polymer cement can be poured in an amount corresponding to a thickness of 1 to 10 mm, and then the concrete 17 can be poured. According to this, the adhesiveness between the concrete pillar 9 and the reinforcing layer 11 can be further strengthened by the polymer cement.

The reinforcing fiber reinforcing material 19 may be used by being impregnated with resin when used in the mold 20, or may be previously impregnated with resin and semi-cured to be used in the form of prepreg. Good. When impregnating with resin at the time of enforcement,
The resin may be applied and impregnated and then the reinforcing fiber reinforcing material 19 may be attached and applied, or the resin may be applied and impregnated and applied. The prepreg has an advantage that the work of applying and impregnating the resin at the time of application can be omitted, but the resin is hardened unless it is cooled, and it is difficult to use.

As the reinforcing fiber reinforcing material of the type impregnated with resin at the time of execution, for example, a unidirectional reinforcing fiber sheet can be used, but not limited to this, a reinforcing fiber cloth, a mat or the like can also be used. . An example of unidirectional reinforcing fibers is shown in FIG.

As shown in FIG. 4, the unidirectional reinforcing fiber sheet 1 has reinforced fibers 4 arranged in one direction on a support sheet 2 with an adhesive layer 3 interposed therebetween.

For the support sheet 2 of the reinforcing fiber sheet 1, scrim cloth, glass cloth, release paper, nylon film or the like is used. Among these, in the sheet 2 using the above-mentioned scrim cloth, glass cloth, or the like, the thermosetting resin can be impregnated into the reinforcing fiber 4 from the sheet 2 side. The thickness of the support sheet 2 is
From the viewpoint of being flexible and capable of supporting the reinforcing fiber 4, 1
˜500 μm, preferably 5˜100 μm.

The adhesive forming the adhesive layer 3 may be any adhesive as long as it can at least temporarily bond the reinforcing fibers 4 to the support sheet 2, but a resin having a good compatibility with the thermosetting resin. Is preferably used. For example, when an epoxy resin is used as the thermosetting resin, an epoxy adhesive is preferably used. The thickness of the adhesive layer 3 is 1 to 500 μm, preferably 10 to 30 μm, as long as the reinforcing fibers 4 can be temporarily bonded.

The unidirectionally arranged reinforcing fibers 4 of the reinforcing fiber sheet 1 are a fiber bundle in which a large number of filaments are converged or a fiber bundle which is lightly twisted and converged is provided on the support sheet 2 via the adhesive layer 3. It is provided on the support 2 by arranging in one direction and crushing from above. The fiber bundle is lightly separated by crushing the fiber bundle, and the filaments are unidirectionally arranged on the support sheet 2 via the adhesive layer 3 in a state in which the filaments are laminated in a plurality of layers by a binding agent or a twisting connection. Then, the desired reinforcing fiber sheet 1 is obtained.

In this case, the fiber bundles can be closely arranged, or can be arranged sparsely with an interval therebetween. The fiber bundle may or may not be opened with filaments. The degree of crushing of the fiber bundle depends on the layer thickness to be obtained for the reinforcing fibers 4 arranged by this, but in the case of carbon fiber, when the fiber bundle is formed by converging about 12000 filaments having a diameter of 5 to 15 μm. As an example, it is crushed to have a width of about 5 mm in the lateral direction.

The thermosetting resin with which the reinforcing fiber 4 is impregnated includes epoxy, unsaturated polyester, vinyl ester,
A thermosetting resin such as urethane can be used. In particular, by adjusting the curing agent and curing accelerator of the thermosetting resin, a resin that is cured at a temperature of 50 ° C. or higher is
It can be used preferably.

In the above examples, the concrete column 9 having the reinforcing layer 11 made of the fiber-reinforced composite resin material was manufactured by the centrifugal casting method, but the present invention is not limited to this, and the outer mold and the mold are arranged concentrically. By placing a basket of reinforcing steel between the inner mold and the concrete mold by pouring concrete between the inner mold and the inner mold of the outer mold, by applying a reinforcing fiber reinforcement material impregnated with resin Similarly, it is possible to obtain the concrete pillar 9 having the reinforcing layer 11.

[0034]

As described above, according to the production method of the present invention, at the same time as the production of a concrete column, a reinforcing layer such as an elastic reinforcement made of a fiber-reinforced composite resin material is provided around a desired portion on the outer surface of the concrete column. Since it can be integrally formed, it is possible to easily obtain a concrete column having a reinforcing layer without the trouble of forming the reinforcing layer later.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a concrete column manufactured by a manufacturing method of the present invention.

FIG. 2 is a front view of a concrete column of the same.

FIG. 3 is a process drawing showing an embodiment of the method for manufacturing a concrete column of the present invention.

FIG. 4 is a cross-sectional view showing a reinforcing fiber sheet that can be used in the manufacturing method of the present invention.

[Explanation of symbols]

 1 Unidirectional Fiber Reinforced Sheet 2 Support Sheet 3 Adhesive Layer 4 Reinforced Fiber 9 Concrete Column 11 Reinforcement Layer 17 Concrete 18 Reinforcing Bar Basket 19 Reinforced Fiber Reinforcement 20 Mold

Claims (1)

[Claims] 1. A resin-impregnated reinforcing fiber reinforcing material is applied to the inner surface of a substantially cylindrical mold in the circumferential direction, and then a basket of reinforcing bars is coaxially arranged and supported in the mold. A method for producing a concrete column, comprising pouring concrete into the interior, curing the poured concrete to solidify, and obtaining a concrete column having a reinforcing layer of a fiber-reinforced composite resin material around the outer surface.