JP2001164530A - Protective barrier for road made of concrete and manufacturing method of protective barrier for road - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a protective barrier for a road being made of concrete and having sufficient impact resistance in a short period. SOLUTION: The protective barrier 20 has a concrete section 22 and a sound absorbing material 24 installed on the surface of the concrete section 22. The concrete section 22 is formed as a structure by continuously placing concrete, which is formed by mixing short fibers 26 in length of 30-60 mm composed of either of short fibers made of steel, ones made of plastics or ones made of glass at the rate of 1-3 vol.% to total volume and by mixing fluidized-bed ash at the rate of 30-50 vol.% to the total volume of fine aggregate, by a slip form paving method at a site.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete road protection wall and a method of manufacturing a road protection wall, which are installed as a median strip or a sound barrier of a road.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional protective wall 2. The protective wall 2 is a reinforced concrete structure having a trapezoidal cross section, and is integrated on the basic concrete 4 by fixing anchors 6 rising from the basic concrete 4.

The protective wall 2 has a structure in which, instead of having a relatively small cross section, a large number of reinforcing bars 8, 10...
By increasing the amount of rebar, the structure is such that it can sufficiently withstand the impact force when a vehicle collides.

[0004]

However, the protection wall 2 shown in FIG. 2 has the following problems because the amount of the reinforcing bars 8, 10,... That is, when the protective wall 2 is manufactured as a secondary product in a factory or the like, and is carried into the site and then integrated on the foundation concrete 4, it takes a lot of time and labor to assemble the rebar in the factory or the like. As a result, the manufacturing cost of the protection wall 2 increases.

In the case where the protective wall 2 is manufactured on site (road), the assembling work of the reinforcing bar also requires a lot of time and labor, so that there is a problem in terms of manufacturing cost, and there is a problem in terms of manufacturing cost. By the time the installation is completed, it is necessary to restrict some traffic on the road for a long period of time, which may affect road traffic. Here, it is conceivable to form a protective wall using concrete using steel fiber instead of reinforcing steel. However, if a protective wall made of concrete using such steel fiber is used, the required performance (automotive collision) In order to satisfy the strength sufficient to withstand the impact force), it is necessary to increase the amount of cement used, and there is still a problem in the production cost.

The present invention has been made in view of the above circumstances, and is intended to produce a concrete structure having sufficient impact resistance in a short period of time so as to produce a site (road) without adversely affecting road traffic. It is an object of the present invention to provide a concrete road protection wall and a method of manufacturing the road protection wall which can be manufactured economically.

[0007]

In order to solve the above-mentioned problems, a concrete road protection wall according to claim 1 is provided.
1 to 3 vol% of the total volume of 30 mm to 60 mm short fibers made of steel, plastic, or glass
And the fluidized bed ash was added to the fine aggregate in a volume of 3%.
It is formed by mixing at a rate of 0 to 50 vol%.

According to a second aspect of the present invention, in the concrete protective wall for a road according to the first aspect, the concrete surface has various functions such as a sound absorbing material, a polluted air absorbing material, an electromagnetic wave absorbing material, and a greening material. One of the materials was provided integrally.
The method for manufacturing a road protective wall according to claim 3 is a method for manufacturing a road protective wall having a length of at least one of steel, plastic, and glass.
0 to 60 mm staple fibers are mixed at a rate of 1 to 3 vol% with respect to the total volume, and fluidized bed ash is added to the fine aggregate at a volume of 30 vol.
This is a method in which concrete mixed at a rate of ５０50 vol% is continuously cast and formed on site by a slip-form method.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings and tables. Note that the same components as those shown in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 shows a concrete road protective wall (hereinafter referred to as a protective wall) 20 of the present embodiment, which is integrated on the basic concrete 4 by a fixing anchor 6 rising from the basic concrete 4.

The protective wall 20 includes a concrete section 22 having a trapezoidal cross section and a sound absorbing material 24 provided on the entire surface of the concrete section 22 and is installed as a road soundproof wall. The concrete part 22 is manufactured by mixing a predetermined amount of cement, water, sand as fine aggregate, gravel as coarse aggregate, and short fibers 26. In addition to these materials, a part of the fine aggregate is manufactured. As coal ash is mixed.

As the coal ash, for example, fine powdered coal ash discharged from a fluidized bed combustion boiler (hereinafter referred to as fluidized bed ash) is used. The short fibers 26 are made of steel,
Plastic or glass fibers from 30mm to 6mm
This is a member cut to about 0 mm. Here, the optimum mixing amount of the fluidized bed ash and the optimum mixing amount of the short fiber 26 will be described with reference to Tables 1 and 2.

Table 1 is a list of concrete mixing examples. Symbols 1 to 8 in Table 1 indicate the water cement ratio (W /
C) is constant, and the volume% of fluidized bed ash with respect to the total volume of sand (vol%: fluidized bed ash sand replacement ratio) and the short fiber made of steel, plastic, or glass with respect to the total volume of concrete Of the concrete in which the volume% (vol%: mixing ratio of short fibers) was varied. Table 2 shows the fluidized bed ash-sand replacement ratio, the short fiber mixing ratio, and the strength test results (compression strength, bending strength, toughness coefficient) of the concrete of symbols 1 to 8.

[0013]

[Table 1]

[0014]

[Table 2]

Due to the design, the bending strength of the protective wall 20 which can sufficiently withstand the impact force at the time of an automobile collision needs to be 9 N / mm ² or more. In Table 2, symbols 2 to
The concrete sample of symbol 5, that is, the concrete sample having a fluidized bed ash sand replacement ratio of 30 vol% to 50 vol% has a bending strength of 9 N / mm ² or more, and also has an increased compressive strength.

Also, when comparing concrete samples of symbols 3, 5, 6, and 7 in which the fluidized bed ash sand replacement ratio is 40 vol%, the mixing ratio of short fibers with respect to the samples of symbols 3 and 6 is increased. Samples of symbols 5 and 7 (symbols 3 and 6 have a short fiber mixing ratio of 1 vol% and symbols 5 and 7 have a short fiber mixing ratio of 2 vol%) have higher values of the toughness coefficient. Is shown.

Accordingly, the concrete used for the protective wall 20 has a fluid bed sand replacement ratio of 30 vol% to 50 vol.
%, And the mixing ratio of the short fibers is 1 vol% to 3 vol%. As for the mixing of the concrete used for the concrete protection wall 20, it is preferable to select the amount of fluidized bed ash or short fiber in consideration of design conditions and cost.

In the case where the protective wall 20 is continuously formed at the site by the slip-form method, the following is performed. That is, using a self-propelled slip-form construction machine equipped with a movable formwork capable of moving in the direction in which the protective wall 20 is formed, a movable formwork set to be a predetermined protective wall installation location is used. The uncured concrete discharged from the rear part of the movable formwork is moved by the slipform construction machine traveling along the planned place of the protective wall while pouring concrete inside and compacting and shaping, It is shaped into a predetermined protective wall shape and is autonomously shaped at a predetermined installation position. By continuing this shaping work, the protective wall 20 is continuously formed at a predetermined installation position.

Therefore, in the present embodiment, the fluidized bed ash sand replacement ratio is set to 30 vol% to 50 vol%, and the short fiber mixing ratio is set to 1 vol.
By forming the concrete portion 22 at a vol% to 3 vol%, the compressive strength and the flexural strength are increased, the toughness coefficient is high, and the protective wall 20 optimal for impact resistance in the event of a collision of an automobile is provided.
As compared with a conventional protective wall having an increased amount of reinforcing bars, the need for reinforcing bars is eliminated, thereby eliminating the need for assembling reinforcing bars. Therefore, manufacturing costs can be reduced.

When the protection wall 20 is manufactured on site, that is, on the road, the assembling work of the reinforcing bar is eliminated as described above, and the concrete portion 22 is continuously formed by the slip foam method. The period until the installation of the protective wall 20 is completed is short, and has little effect on road traffic. Then, the protection wall 20 of the present embodiment
Uses fluidized bed ash as a reinforcing material for concrete, so it is not necessary to increase the amount of cement, high strength can be obtained at low cost, and fluid bed ash, which is an unused resource, can be used effectively. Can play.

Further, by providing the sound absorbing material 24 on the surface of the concrete portion 22, the function as a soundproof wall can be reliably exhibited. In the present embodiment, the sound absorbing material 24 is provided on the surface of the concrete portion 22. However, on the surface of the concrete portion 22, various functional materials such as a polluted air absorbing material, an electromagnetic wave absorbing material, and a greening material are integrally provided. The effect as a protective wall that can exert these various functions can be obtained.

The connection method when various functional materials are integrally provided on the surface of the concrete portion 22 is as follows.
It is preferable to use a method of fixing various functional materials to an anchor (not shown) embedded in the surface of No. 2 or a method of fixing using an adhesive. However, the present invention is not limited to this, and other methods may be used as long as various functional materials can be integrally fixed to the surface of the concrete portion 22.

[0023]

As described above, according to the first aspect of the present invention,
According to the concrete road protection wall according to the above, the compression strength and bending strength are increased, the toughness coefficient is also high, it becomes the optimum protection wall for impact resistance in the event of a car collision, and the amount of rebar increases as before Compared with the provided protective wall, the labor for assembling the reinforcing bar is not required, so that the protective wall can be manufactured by greatly reducing the manufacturing time on site. Therefore, it is possible to shorten the construction period and the manufacturing cost. Furthermore, since the protective wall of the present invention can replace a part of cement with fluidized bed ash, it is not necessary to increase the amount of cement, and it is possible to obtain a high-strength protective wall economically and is an unused resource. The effect that fluidized bed ash can be used effectively is also exerted.

According to the concrete road protection wall of the second aspect of the present invention, any one of various functional materials such as a sound absorbing material, a polluted air absorbing material, an electromagnetic wave absorbing material and a greening material is provided on the surface of the concrete part. Since these are integrally provided, it is possible to provide a concrete road protection wall having these functions. Further, according to the method for manufacturing a road protective wall according to claim 3 of the present invention, the protective wall can be formed by continuously driving the protective wall at a location where the protective wall is installed by the slip-form method. The required construction period is short, and the period of traffic regulation for construction can be shortened, so that the influence on road traffic can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a protective wall according to the present invention.

FIG. 2 is a cross-sectional view showing a conventional protection wall.

[Explanation of symbols]

 Reference Signs List 20 Protective wall 22 Concrete part 24 Sound absorbing material 26 Short fiber

Continued on the front page F term (reference) 2D001 AA01 BA01 CA01 CB01 DA00 DA06 2D101 CA07 CB04 DA01 DA04 DA05 EA01 FA02 FB02 GA15

Claims (3)

[Claims] 1. A short fiber having a length of 30 mm to 60 mm made of steel, plastic or glass is mixed at a ratio of 1 to 3 vol% with respect to the total volume, and fluidized bed ash is mixed with fine aggregate. Concrete road protection wall formed by mixing at a rate of 30 to 50 vol% with respect to the total volume. 2. The concrete material according to claim 1, wherein any one of various functional materials such as a sound absorbing material, a polluted air absorbing material, an electromagnetic wave absorbing material, and a greening material is integrally provided on the surface of the concrete. Road protection wall. 3. A short fiber having a length of 30 mm to 60 mm made of steel, plastic or glass is mixed at a ratio of 1 to 3 vol% with respect to the total volume, and fluidized bed ash is mixed with fine aggregate. A method for manufacturing a road protection wall, comprising continuously forming concrete mixed at a rate of 30 to 50 vol% with respect to the total volume at a site by a slip-form method.