JP4115134B2 - Concrete member and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete member, and more particularly to a precast concrete member and a manufacturing method thereof.
[0002]
[Prior art]
Today, disposal of concrete waste generated from the demolition of concrete buildings is a big problem for environmental conservation and resource saving, so it is used as roadbed material and backfill material for reuse. There is a problem with reuse of buildings.
[0003]
In other words, demolition concrete waste ( hereinafter, recycled aggregate means demolition concrete waste ) has a high water absorption rate as it is (2 to 3 times that of normal aggregate), and is therefore resistant to freeze-thawing and neutralization. There are poor problems.
[0004]
Therefore, the cement paste adhering to the aggregate in the demolished concrete scrap is removed by some processing method such as heat treatment and fried rice, and the aggregate is also reused. In the method, the processing equipment and cost are increased, and the effect of using the waste material is diminished, and the power of the processing machine is required, so that there is a problem in discharging carbon dioxide.
In addition, concrete using alkali-silica reactive aggregates is difficult to distinguish from healthy concrete, and there is no way to deal with it when mixed.
[0005]
Accordingly, an object of the present invention is to provide a concrete member using recycled aggregate that can solve the above-mentioned problems and a method for manufacturing the same.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a first invention according to claim 1 is characterized in that the entire outer surface of a concrete body using a recycled aggregate placed in a plate shape is integrally cast over the entire outer surface. It is a concrete member characterized in that it is covered with a concrete body using a normal aggregate.
[0012]
The second invention according to claim 2, place mold around on the bed, the concrete body that is molded using recycled aggregates in mold frame, front and back portions of the concrete body and the outer peripheral portion A concrete member manufacturing method characterized by placing concrete with a space in and placing concrete using ordinary aggregates on the front and back portions and the outer periphery of the concrete body.
[0013]
A third invention according to claim 3, a cylindrical inner mold made of a porous metal plate, placed with its open end facing upwards, a cylindrical outer molds disposed outside the inner formwork A concrete member manufacturing method comprising placing concrete using recycled aggregate in the inner mold, and placing concrete using ordinary aggregate between the inner mold and the outer mold It is.
[0014]
A fourth invention according to claim 4, the internal concrete of columnar molded concrete using recycled aggregate standing arrangement, to place the mold on the outer periphery thereof, the internal concrete bodies and the outer frame of the columnar It is a method for producing a concrete member, characterized in that concrete using ordinary aggregate is placed between them.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described based on examples shown in the drawings.
[0016]
FIG. 1 shows the manufacturing process of Reference Example 1 .
[0017]
In the manufacturing process of the reference example 1 , in the factory, first, as shown in FIG. 1A, a surrounding mold 2 is arranged on the bed 1, and no recycled aggregate is used in the mold 2. Concrete, that is, first concrete 3 using ordinary aggregate is placed to a predetermined thickness t1. The thickness t1 of the first concrete 3 is a dimension obtained by adding a slight dimension to a necessary covering dimension.
[0018]
Next, as shown in FIG.1 (b), the 2nd concrete 4 which uses the reproduction | regeneration aggregate is cast on the upper surface of the said 1st concrete 3 by predetermined thickness t2. This recycled aggregate is obtained by crushing demolition concrete waste, and is an aggregate that has not been subjected to the removal treatment of the noro adhering to the aggregate.
[0019]
Next, as shown in FIG.1 (c), the 3rd concrete 5 which uses the normal aggregate similar to the said 1st concrete 3 on the upper surface of the 2nd concrete 4 which uses the said recycled aggregate. To a predetermined thickness t3. The thickness t3 is the same as that of the first concrete 3.
[0020]
In addition, although the necessary reinforcing bars are arranged in each of the concrete 3, 4, 5, the arrangement of the reinforcing bars is omitted in the drawing.
[0021]
And after curing and solidifying each said concrete 3, 4, and 5, it demolds. Thereby, as shown in FIG. 1 (d), the front and back surfaces of the second concrete body 4A using the recycled aggregate are sandwiched between the first and third concrete bodies 3A and 5A using the ordinary aggregate. A plate-shaped concrete member 6 made of precast (PCa) is obtained.
[0022]
Note that the second concrete body 4A using the recycled aggregate is exposed at the end face of the concrete member 6 as manufactured, but when this concrete member 6 is used in a building, the end face is used as a normal bone. Durability is ensured by covering with concrete using the material.
[0023]
According to the manufacturing method of the first reference example, three layers of concrete can be continuously cast using one mold, and the placing work can be facilitated. This is the first effect in manufacturing.
[0024]
Furthermore, since recycled aggregate is reused (consumed) in large quantities as a concrete product, it is possible to reduce a large amount of dismantled concrete and contribute to environmental problems. Further, in the conventional method of removing the noro adhering to the recycled aggregate with heating, filing, etc., carbon dioxide gas is discharged because the power of the processing machine is required, and carbon dioxide emission regulation Although a problem arises, according to the present Reference Example 1 , since the demolished concrete waste can be used as it is without being treated as described above, it can also cope with the carbon dioxide emission regulation. This is the second effect from the environment.
[0025]
In addition, the plate-like concrete member manufactured according to Reference Example 1 is used as an outer wall plate and a roof material in particular, but the concrete bodies 3A and 5A using the ordinary concrete are the concrete bodies 4A using the recycled aggregate. As a result, it is possible to eliminate the problem of durability of concrete caused by freezing and thawing and neutralization, and alkali-silica reactive recycled aggregates are mixed. Even if it is, it can be confined and blocked inside by the moisture supply surface, so that it can be used as an outer wall or the like in the same manner as a concrete member using ordinary aggregate. Also, there is no problem with the strength of the concrete member. This is the third effect from the product.
[0026]
FIG. 2 shows the manufacturing process of Reference Example 2 .
[0027]
In the manufacturing process of the reference example 2 , in the factory, as shown in FIG. 2A, first, a peripheral outer frame 7 is arranged on the bed 1 and an inner frame 8 is placed inside the outer frame 7. Are arranged with a predetermined space 9. The inner mold 8 is arranged with its lower end 8a separated from the bed 1 by a predetermined dimension t1, and is held by the outer mold 7 with a holder 10 partially arranged in the circumferential direction of the frame. Between the two mold frames 7 and 8 arranged in this manner, a placement space 9 having an open upper end is formed.
[0028]
Next, in the placement space 9 between the two mold frames 7 and 8 arranged as described above, the first concrete 3 using ordinary aggregate is placed from its upper end opening, and the outer mold frame is placed. On the bed 1 between 7 and 7, the first concrete 3 using normal aggregate is placed by the thickness of the dimension t1.
[0029]
Next, after curing and solidifying the first concrete 3, the molds 7 and 8 are removed, and a back plate 3a and an outer peripheral plate 3b are integrally formed as shown in FIG. 2 (b). Then, a first concrete body 3B having a recess 3c whose upper surface is opened is obtained.
[0030]
Next, as shown in FIG.2 (c), the 2nd concrete 4 which uses the recycled aggregate in the recessed part 3c of the said 1st concrete body 3B fell by predetermined dimension t3 from the upper end of the outer peripheral board 3b. Drive to the position.
[0031]
Next, as shown in FIG.2 (d), the 3rd concrete 5 which uses a normal aggregate on the upper surface of the said 2nd concrete 4 is driven to the upper end position of the outer peripheral board 3b.
[0032]
Then, the second concrete 4 and the third concrete 5 are cured and solidified. Thereby, as shown in FIG. 2 (d), the first and third concrete bodies 3A using ordinary aggregates on the front and back surfaces and all side end faces of the second concrete body 4A using recycled aggregates. A plate-shaped concrete member 11 made of precast (PCa) coated with 5A is obtained.
[0033]
According to the manufacturing method of the present Reference Example 2 , compared to the Reference Example 1 , the entire circumference of the concrete 4 using the recycled aggregate can be integrally covered with the concrete body using the ordinary aggregate. Durability can be improved.
[0034]
Furthermore, the second and third effects can also be exhibited.
[0035]
FIG. 3 shows the manufacturing process of Reference Example 3 .
[0036]
The present reference example 3 is an example in which a mold made of a porous metal plate, for example, a mesh mold (lass mold) 12 is used instead of the inner mold 8 in the reference example 2 . Since other structures and manufacturing steps are the same as those of the reference example 2 , the same members are denoted by the same reference numerals and the description thereof is omitted.
[0037]
In addition, in the manufacturing method of this reference example 3, the effort which removes the mesh formwork 12 becomes unnecessary, and the adhesiveness of the 1st concrete 3 and the 2nd and 3rd concretes 4 and 5 is also good.
[0038]
Furthermore, the same effects as in Reference Example 2 can be exhibited in Reference Example 3 .
[0039]
FIG. 4 shows the manufacturing process of the first embodiment of the present invention .
[0040]
In the manufacturing process of the first embodiment, in the factory, first, as shown in FIG. 4A, a surrounding mold 13 is arranged on the bed 1, and recycled aggregate is used in the mold 13. The concrete 4 is cast to a predetermined thickness, for example, a thickness t2 similar to the thickness t2 of each of the above reference examples , and this is cured and solidified, and demolded. The mold 13 may be a mesh mold.
[0041]
On the other hand, apart from the mold 13, a mold 14 that is higher than the mold 13 and has a larger inner dimension is arranged on the bed 1 as shown in FIG. A spacer 16 is disposed on the bed 1, and a placement space 17 is formed between the upper end of the spacer 16 and the bed 1.
[0042]
Next, as shown in FIG. 4 (c), the concrete body 4A using the regenerated aggregate obtained by molding and solidifying in FIG. 19 is generated and placed on the spacer 16.
[0043]
Next, as shown in FIG. 4D, concrete 20 using ordinary aggregate is placed in the placement spaces 18 and 19. The concrete 20 flows into the lower placement space 17 through the placement space 18 on the outer periphery of the concrete 4A using the recycled aggregate.
[0044]
Then, the concrete 20 is cured and solidified to be demolded. As a result, as shown in FIG. 4 (e), the recycled aggregate is used by the concrete body 20A composed of the front plate 20a, the outer peripheral plate 20b, and the back plate 20c formed of concrete using ordinary aggregate. A plate-like concrete body 21 made of precast (PCa) covering the entire surface of the concrete 4A thus obtained is obtained.
[0045]
According to the manufacturing method of the first embodiment, since the concrete placement work can be performed twice, the number of times of placing concrete can be reduced as compared with Reference Example 1 to Reference Example 3 .
[0046]
Further, the same effect as in the second embodiment can be exhibited in the first embodiment.
[0047]
FIG. 5 shows a second embodiment.
[0048]
The second embodiment is an example showing the case of vertical placement of concrete, and is an example suitable for manufacturing square members such as columns and beams.
[0049]
In the second embodiment, first, as shown in FIG. 5 (a), a cylindrical inner mold made of a porous metal plate, for example, a mesh mold (lass mold) 22 is opened with its opening facing upward. The cylindrical outer mold 23 is arranged on the outside with the opening facing upward, and an outer placement space 24 is formed between the inner mold frame 22 and the outer mold frame 23. An inner placement space 25 is formed in the mold 22.
[0050]
Next, concrete using ordinary aggregate is placed in the outer placement space 24, and concrete using recycled aggregate is placed in the inner placement space 25.
[0051]
Then, both the concretes are cured and solidified, and the outer mold 23 is removed, so that the outer periphery of the concrete body 26 using the recycled aggregates is made of ordinary aggregates as shown in FIG. 5 (b). A columnar and beam-shaped concrete member 28 made of precast (PCa) covered with the used concrete body 27 is obtained.
[0052]
Note that the order of placing concrete into the outer placement space 24 and the inner placement space 25 may be first.
[0053]
In addition, the concrete 26 using the recycled aggregate is exposed at the upper and lower ends of the concrete member 28 as it is manufactured. When the concrete member 28 is used in a building, the end face is made of ordinary aggregate. Durability is ensured by covering with concrete.
[0054]
Also in the second embodiment, the second and third effects in the reference example 1 can be exhibited.
[0055]
FIG. 6 shows another example of vertical strike as in the second embodiment.
[0056]
In the third embodiment, first, as shown in FIG. 6 (a), a columnar inner concrete body 29 is formed from concrete using recycled aggregate.
[0057]
Next, as shown in FIG. 6B, the inner concrete body 29 is erected and the mold 31 is arranged so that a placement space 30 is formed around it.
[0058]
Next, concrete using ordinary aggregate is placed in the placement space 30 from the upper opening.
[0059]
Then, the concrete is cured and solidified, demolded, and the periphery of the concrete body 29 using the recycled aggregate as shown in FIG. 6C is covered with the concrete 32 using the ordinary aggregate. A concrete member 33 is obtained.
[0060]
In the third embodiment, the same effect as that of the second embodiment can be exhibited.
[0061]
FIG. 7 shows Reference Example 4 .
[0062]
In this reference example 4 , as shown in FIG. 7A, the corner mold inner mold 35 is disposed only at the inner corner portion of the outer mold 34, and the molds 34 and 35 are rotated at a low speed. The concrete 36 using ordinary aggregate is added to increase the thickness, and then the speed is gradually changed to high speed rotation, and the concrete 36 is compacted by centrifugal force.
[0063]
Thereafter, the concrete 36 is cured and solidified, and both the molds 34 and 35 are removed from the mold to obtain a hollow outer concrete body 36A having a hollow portion 37 as shown in FIG. 7B.
[0064]
After that, concrete 38 using recycled aggregate is put into the hollow portion 37 of the outer concrete body 36A and cured and solidified, and the concrete body 38A using recycled aggregate as shown in FIG. A concrete member 39 whose outer surface is covered with a concrete body 36A using ordinary aggregate is obtained.
[0065]
In the present reference example 4 , the second and third effects can be exhibited, and a high strength concrete member can be formed.
[0067]
【The invention's effect】
According to the present invention, recycled aggregate can be reused (consumed) in large quantities as a concrete product, so that a large amount of dismantled concrete waste can be reduced, contributing to environmental problems.
[0068]
Furthermore, since the recycled aggregate is used without being processed by using power as in the conventional case, it is possible to cope with the problem of carbon dioxide emission and to cope with the future social situation.
[0069]
Furthermore, even if the recycled aggregate is used as it is, the surface of the concrete using the recycled aggregate is covered with the concrete using the ordinary aggregate. The problem is solved, even if alkali-silica reactive aggregate is mixed in the recycled aggregate, it is detoxified by moisture blockage, it can be used for outer wall material etc. like a concrete member using ordinary aggregate, There is no problem with strength.
In addition, since aggregates (particularly fine aggregates) used in concrete are about to be exhausted, this is also a countermeasure.
[Brief description of the drawings]
1 is a cross-sectional view showing a manufacturing process of Reference Example 1. FIG.
2 is a cross-sectional view showing a manufacturing process of Reference Example 2. FIG.
3 is a cross-sectional view showing a manufacturing process of Reference Example 3. FIG.
FIG. 4 is a sectional view showing a manufacturing process of the first embodiment of the present invention.
FIG. 5 is a sectional view showing a manufacturing process of a second embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a manufacturing process of a third embodiment of the present invention.
7 is a cross-sectional view showing a manufacturing process of Reference Example 4. FIG.

Claims (4)

A concrete characterized in that the entire outer surface of a concrete body using a recycled aggregate placed in a plate shape is covered with a concrete body using an ordinary aggregate formed by casting integrally over the entire outer surface. Element. A surrounding formwork is placed on the bed, and a concrete body formed using recycled aggregate in the formwork is placed with a space in the front and back and outer periphery of the concrete body. A method for producing a concrete member, characterized in that concrete using ordinary aggregate is placed on the front and back sides and the outer periphery of the body. A cylindrical inner mold frame made of a porous metal plate is disposed with its open end facing upward, a cylindrical outer mold frame is disposed outside the inner mold frame, and recycled aggregate is placed in the inner mold frame. A method for producing a concrete member, characterized in that the used concrete is placed, and concrete using ordinary aggregate is placed between the inner mold frame and the outer mold frame. A columnar inner concrete body molded from concrete using recycled aggregate is placed upright, a formwork is placed on the outer periphery, and concrete using ordinary aggregate is placed between the columnar inner concrete body and the outer frame. A method for producing a concrete member, characterized by being cast.

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