JP2004291277A - Method for manufacturing composite porous block with hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve the shortening of a block manufacturing time and the reduction of a production cost in a method for manufacturing a composite porous block with hole, capable of forming a hole part to the composite porous block even if a special core having a diameter contracting function is not used. <P>SOLUTION: This method for manufacturing the composite porous block with the hole includes a first process (a) for setting a form 11, to which a core 16 for molding a hole is attached from the outside in a freely detachable manner, on a vibration table 10, a second process (b) for filling the form 11 with highly hard kneaded porous concrete 12 of zero slump and general concrete 18 in a laminated state and vibrating the vibration table 10 while pressing the upper surface of the filled concrete and a third process (c) for taking the core 16 out of the form 11 after the vibration of the vibration table 10 is completed and immediately demolding a concrete molded object to age the same. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a composite porous block with holes.
In the present specification, the composite porous block refers to a concrete block in which porous concrete having continuous voids and dense ordinary concrete are laminated.
[0002]
[Prior art]
Porous concrete is a porous concrete having continuous voids and has the property of allowing water and air to freely pass through, and thus has the function of naturally purifying water by microorganisms living inside and outside the porous surface. . In order to make full use of such characteristics, it is preferable to increase the porosity as much as possible. However, if the porosity is too large, there is a dilemma that the strength is reduced.
[0003]
Therefore, in order to secure the strength and other properties as a concrete block for civil engineering structure while taking advantage of the above-mentioned porous concrete, a composite porous block in which porous concrete and ordinary concrete are laminated has already been developed. For example, by pouring porous concrete on a mold bottom plate, casting zero-slump ultra-hard kneaded ordinary concrete on it, applying vibration pressure to the upper surface, and immediately removing the mold It can be manufactured (see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-10-151612 (Claim 2)
[0005]
[Problems to be solved by the invention]
By the way, there is a product which needs to form a hole in a composite porous block which is a laminate of porous concrete and ordinary concrete, such as a slope greening block and a sidewalk boundary block which will be described later. In order to manufacture such a composite porous block with holes, a core having a half-split structure having a diameter reducing function is mounted in a mold, and a composite porous block having a two-layer structure is molded and cured in this state. After curing, it is usual to form a hole by removing the core from the cured block.
[0006]
However, in the method of forming the hole for taking out the core from the cured block as described above, a special core having a half-split structure having a diameter reducing function is required, so that the manufacturing cost is increased and Since it is necessary to reduce the diameter of the core after the porous block is hardened and remove the core from the block, there is a drawback that the production time becomes longer.
[0007]
The present invention has been made in view of such circumstances, and enables a hole to be formed in a composite porous block without using a special core having a diameter reducing function, thereby significantly reducing the manufacturing time and manufacturing cost of the block. An object of the present invention is to provide a method for producing a composite porous block with holes, which can be reduced.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has taken the following technical measures.
That is, the present invention is a method for producing a composite porous block with holes including the following steps (a) to (c).
(A) A first step of setting a mold on which a core for hole formation is detachably attached from the outside on a vibration table (b) In the mold, ultra-slimming of a zero slump is performed. The second step (c) of vibrating the vibrating table while pressing the upper surface thereof by filling the super-hardened ordinary concrete similar to the porous concrete in a laminated state (c) The third step of removing the child from the mold, immediately removing the concrete molded body and curing it.
According to the present invention described above, in a mold in which a core for hole forming is detachably attached from the outside, a super-hardened zero-slump porous concrete and a normal concrete are filled in a stacked state and added. The concrete molding was immediately removed from the mold after removing the core from the mold frame by pressing and vibrating, so forming the hole just by removing the core immediately before removing the concrete molded body immediately For this reason, a hole can be more easily formed in the composite porous block after curing and curing than in the case where a core having a diameter reducing function is removed from the composite porous block. Further, since the core is taken out immediately before the mold is released, the hole can be formed neatly without breaking the hole.
[0010]
In the present invention, it is preferable that the core is formed of a rod-shaped member that penetrates the side wall of the mold so that it can be freely inserted and removed along the axial direction.
If a core made of such a rod-shaped member is employed, the core can be removed from the mold just before being immediately removed from the mold by pulling it out from the side wall of the mold along the axial direction thereof. There is an advantage that work becomes very simple. In this case, the core may be a straight rod having a straight axis or a curved rod having a curved axis.
[0011]
On the other hand, in the second step, if the vibration table is vibrated while filling the porous concrete and pressing the upper surface thereof, and then the vibration table is vibrated while filling the ordinary concrete and pressing the upper surface thereof, Since the normal concrete is filled on the porous concrete that has been compacted once by the pressurized vibration, the mixing ratio of both concretes at the time of final pressurized vibration is reduced, and the joint surface of both concretes appears more clearly A composite porous concrete with high dimensional accuracy can be obtained.
[0012]
For the same reason, in the second step, conversely, the vibration table is vibrated while filling the ordinary concrete and pressing the upper surface thereof, and thereafter, the vibration table is charged while the porous concrete is filled and the upper surface is pressed. May be vibrated.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of a composite porous block 1 having holes to be manufactured by the method of the present invention. In this case, the porous block 1 is used for greening a slope such as a river embankment or a retaining wall beside a road. Of the slope greening block 1A.
The block 1A for greening the slope comprises a thick plate-shaped block main body 2 having a square shape in plan view. The block main body 2 is formed by superimposing square porous concrete and ordinary concrete having substantially the same thickness with each other. Thus, the porous concrete layer 3 on the front side and the ordinary concrete layer 4 on the back side have a two-layer structure.
[0014]
A plurality of storage recesses 5 are formed on the surface of the block body 2 so as to be able to store vegetation soil therein in the thickness direction from the surface of the block body 2. A total of four storage recesses 5 are provided at the four corners of the block main body 2 and are formed of circular grooves having a depth approximately half the thickness of the block main body 2.
A storage hole 6 communicating with the bottom of the storage recess 5 is formed inside the block main body 2 so as to extend in the in-plane direction of the block main body 2. The storage hole 6 is formed as a circular hole having a circular cross section and extending straight, formed so as to penetrate the block main body 2 from one end surface in the width direction to the other end surface of the block main body 2. Are provided in total.
[0015]
Each of the two storage holes 6 is arranged at a plane position passing through the center of the upper and lower two storage recesses 5 adjacent to each other, and the center of the cross section of the storage hole 6 is defined by the porous concrete layer 3 and the ordinary concrete layer 4. It is arranged at a position in the thickness direction at the same depth as the joining surface. Each of the storage holes 6 is set to have a cross-sectional dimension that allows a water-retaining material, such as soil or coconut shell, to be filled therein.
The slope greening block 1A according to the above configuration is installed, for example, vertically and horizontally on a slope of an existing concrete retaining wall (not shown) so as to cover the slope. . Then, for example, plants such as grasses are planted in the guest soil stored in the storage recesses 5 in a state where the water retention material is filled in the storage holes 6 of each block 1, thereby greening the slope of the concrete retaining wall. can do.
[0016]
Next, with reference to FIG. 2 and FIG. 3, a description will be given of a manufacturing method of the present embodiment for manufacturing the above-described slope greening block 1 </ b> A by an immediate demolding method.
First, as shown in FIG. 2 (a), a steel mold 11 which can be used repeatedly is set on a vibration table 10 supported by rubber vibration isolating legs 8 and having a vibrator 9 on the lower surface side. The frame 11 is filled with the porous concrete 12. The steel mold 11 includes a square cylindrical side wall 13 having upper and lower sides opened, and a bottom plate 14 mounted on a mounting flange projecting inward from a lower end of the side wall 13. Is provided with a cylindrical projection 15 for molding the storage recess 5.
[0017]
A core 16 for molding the storage hole 6 is attached to the mold 11. The core 16 is formed of a rod-shaped member (for example, a round steel pipe) having a circular cross section, and moves to a round hole formed in the opposed side wall 13 of the mold 11 so that the core 16 can be freely inserted and removed along the axial direction. It is freely inserted. Therefore, by inserting and removing the core 16 made of a rod-shaped member toward the side wall 13, the core 16 can be detachably attached to the mold 11 from the outside.
[0018]
Next, as shown in FIG. 2 (b), the mold 11 is filled with the porous concrete 12 which has been ultra-hardened with zero slump to a depth such that the core 16 is almost half buried. The vibrator 9 is operated while pressing the upper surface of the vibrator 9 with the press 17, and the vibrating table 10 is vibrated until the concrete 12 becomes fluid.
After that, as shown in FIG. 3A, the super-hardened ordinary concrete 18 of zero slump is filled into the formwork 11 to the entire upper edge of the side wall 13, and the upper surface of the ordinary concrete 18 is pressed by the press 17. The vibrator 9 is operated while being pressed, and the vibration table 10 is vibrated until the concrete 18 becomes fluid.
[0019]
Then, after the vibration of the vibration table 10 is terminated, as shown in FIG. 3B, the mold 11 is turned upside down with the upper opening closed by the cover plate 19, and the core 16 is moved in the axial direction. And slowly pull it out of the mold 11. Thereafter, the side wall 13 of the mold 11 is pulled upward, the bottom plate 14 is removed, and the concrete molded body thus removed from the mold 11 is cured and hardened at a predetermined temperature, whereby the storage hole 6 is formed. Manufacture of the block 1A for greening a slope which has it is completed.
[0020]
As described above, according to the manufacturing method of the present embodiment, the core 16 is taken out of the mold 11 immediately before the concrete molded body is immediately removed from the mold, so that the storage hole 6 is easily and neatly maintained without breaking. Can be formed. For this reason, the storage hole 6 can be formed more easily in the block 1A than in the case where a core having a diameter reducing function is taken out from the slope greening block 1A after curing and hardening.
Further, according to the manufacturing method of the present embodiment, since the core 16 is adopted from a straight rod-shaped member that penetrates the side wall 13 of the mold frame 11 so that it can be freely inserted and removed along the axial direction, it can be immediately removed. Just before pulling out the core 16 straight from the side wall 13 of the mold 11 along the axial direction thereof, the core 16 can be removed from the mold, and the work of taking out the core 16 is very simple. There is an advantage that is.
[0021]
Furthermore, according to the manufacturing method of the present embodiment, the porous concrete 12 is filled and vibrated under pressure, and then the ordinary concrete 18 is filled. Therefore, the porous concrete 12 once compacted by the pressurized vibration is removed. Since the normal concrete 18 is filled on the top, the mixing ratio of the two concretes 12 and 18 at the time of the final pressurized vibration is reduced, and the joint surface between the two concretes 12 and 18 is more clearly displayed. There is also an advantage that a slope greening block 1A having a high slope can be obtained.
[0022]
In addition, the applicant of the present application used porous concrete 12 and ordinary concrete 18 having the following composition, and actually molded the sloped greening block 1A with the holes by the above-mentioned immediate demolding method. Block 1A having strength was obtained.
[0023]
(1) Maximum size of porous concrete coarse aggregate: 13 (mm)
Slump: 0 (cm)
Water cement ratio: 20 (%)
Fine aggregate ratio:-
Unit water volume: 82 (kg / m3)
Unit cement amount: 410 (kg / m3)
Unit fine aggregate amount:-
Unit coarse aggregate amount: 1608 (kg / m3)
Admixture:-
[0024]
(2) Maximum size of ordinary concrete coarse aggregate: 15 (mm)
Slump: 0 (cm)
Water cement ratio: 35 (%)
Fine aggregate ratio: 74
Unit water volume: 116 (kg / m3)
Unit cement amount: 330 (kg / m3)
Unit fine aggregate amount: 1383 (kg / m3)
Unit coarse aggregate amount: 478 (kg / m3)
Admixture:-
[0025]
FIG. 4 shows another composite porous block 1 with holes to be manufactured by the method of the present invention. In this case, the porous block 1 is composed of a footway boundary block 1B having a drainage function. Among these, the block 1B in FIG. 4A is a straight type used for a cut-down portion such as a pedestrian crossing, and the block 1B in FIG. 4B is a curved type used for a curved portion of a sidewalk.
Such a boundary block 1B has a precast block main body in which the upper half of the cross section is composed of the porous concrete layer 23 and the lower half of the cross section is composed of the ordinary concrete layer 24 having substantially the same thickness as the upper half. 22. The block main body 22 has a base portion 25 whose cross section is mostly buried on the pavement road surface, and a riding portion 26 of the vehicle is formed on the upper surface side of the base portion 25. The riding portion 26 is inclined so that the upper surface becomes gradually lower toward the roadway side, and has a cross-sectional height such that a vehicle such as a passenger vehicle can easily get on the vehicle.
[0026]
In the block body 22 of the sidewalk boundary block 1B, a drainage channel 27 having a circular cross section penetrating in the longitudinal direction is formed inside the cross section, and the center of the drainage channel 27 is substantially the same between the two concrete layers 23 and 24. It is arranged at the center of the cross section of the block body 22 so as to be located on the joint surface.
In the boundary block 1B shown in FIG. 4, the upper portion of the block main body 22 from the upper surface of the block main body 22 to the drainage channel 27 is constituted by the porous concrete layer 23. For this reason, external water such as rainwater flowing on the upper surface of the block main body 22 passes through the continuous gap in the porous concrete layer 23 and is taken into the drainage channel 27.
[0027]
However, the composite porous block with holes 1 to be manufactured by the method of the present invention may have a two-layer structure having holes and a porous concrete 12 and a normal concrete 18. Blocks 1A and 1B shown in FIGS. It is not limited.
Further, the above-described embodiments are all illustrative and not restrictive. The scope of the present invention is defined by the appended claims, and all changes within the scope equivalent to the configuration described therein are also included in the present invention.
[0028]
For example, in the above embodiment, the porous concrete 12 is first filled and vibrated under pressure, and then the ordinary concrete 18 is filled and vibrated under pressure. On the contrary, the ordinary concrete 18 is first vibrated. After filling and vibrating under pressure, the porous concrete 12 may be filled and vibrating under pressure.
The core 16 may be arranged not only at the joint between the porous concrete 12 and the ordinary concrete 18 but also at a portion corresponding to only one of the concretes 12 and 18. Further, the core 16 may be a curved rod having a curved axis.
[0029]
【The invention's effect】
As described above, according to the present invention, since a hole can be formed in a composite porous block without using a special core having a diameter reducing function, the manufacturing time and the manufacturing cost of the block are significantly reduced. can do.
[Brief description of the drawings]
1A is a perspective view of a block for greening a slope, FIG. 1B is a plan view of the block, and FIG. 1C is a side sectional view of the block.
FIG. 2 is a process explanatory view showing a method for producing a composite porous block with holes.
FIG. 3 is a process explanatory view showing a method for producing a composite porous block with holes.
FIG. 4A is a perspective view of a straight type walkway boundary block, and FIG. 4B is a perspective view of a curved walkway boundary block.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Composite porous block 1A Slope greening block 1B Pedestrian road boundary block 10 Vibration table 11 Steel formwork 12 Porous concrete 13 Side wall 16 Core 17 Press 18 Normal concrete

Claims (4)

A method for producing a composite porous block with holes, comprising the following steps (a) to (c).
(A) A first step of setting a mold (11) to which a hole forming core (16) is detachably attached from the outside on a vibration table (10) (b) The mold (11) The second step (c) in which the porous concrete (12) and the ordinary concrete (18), which have been ultra-hardened with zero slump, are filled in a stacked state, and the vibration table (10) is vibrated while pressing the upper surface thereof. After the vibration of the vibration table (10) is completed, the core (16) is removed from the mold (11), and then the concrete molding is immediately removed from the mold and cured. 2. The production of a composite porous block with holes according to claim 1, wherein the core (16) is made of a rod-shaped member that penetrates the side wall (13) of the mold (11) so that it can be freely inserted and removed along the axial direction. Method. In the second step, the vibrating table (10) is vibrated while filling the porous concrete (12) and pressing the upper surface thereof, and thereafter, the vibrating table (10) is charged while filling the ordinary concrete (18) and pressing the upper surface thereof. 3) The method for producing a composite porous block with holes according to claim 1 or 2, wherein In a second step, the vibrating table (10) is vibrated while filling the ordinary concrete (18) and pressing the upper surface thereof, and thereafter, the vibrating table (10) is filled while filling the porous concrete (12) and pressing the upper surface thereof. 3) The method for producing a composite porous block with holes according to claim 1 or 2, wherein

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