JP2850092B2 - Pavement block and pavement using the block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pavement block formed using sludge waste and a pavement comprising the pavement block.

[0002]

2. Description of the Related Art As a pavement for a road surface such as a sidewalk, there is a pavement such as a concrete or asphalt pavement or a pavement of a unit size typified by a stone pavement. Blocks of this unit size, in other words, blocks to be spread on paved roads are roughly divided into those using hard blocks, those using elastic blocks, or soft aggregates and hard aggregates. Some use blocks formed by mixing.

[0003] Of these, those paved using a hard block have little deterioration over time and can exhibit stable performance as a pavement road for many years, but have no shock absorbing property.
If you fall, you may not only suffer from injuries such as bone fractures, but you may even die if you hit the head hard. In addition, it is often more dangerous for elderly people, children and even physically handicapped people than for ordinary people. In addition, a heavy load is imposed on the foot during walking, which often causes fatigue and disability.

In the case of paving using an elastic block, for example, in the case of a paving material in which rubber chips are hardened,
Because of a large displacement when a load is applied, when used on a general sidewalk or a sidewalk in a park, the walking feels fluffy and the walking feeling is poor. Also, as for the slip, since the displacement with respect to the load is large at the time of drying, an appropriate slip cannot be obtained, which also causes the walking feeling to deteriorate. On the other hand, when the surface is wet, the slip resistance is reduced and the surface is often slippery.

[0005] In a pavement using a block made of a mixture of soft aggregate and hard aggregate, specifically, a block made of a mixture of rubber chips and pea gravel and molded with a urethane binder, Although it is possible to obtain a feeling of walking in the middle of the pavement road, it can be said that it has been improved accordingly, but the slip resistance is still insufficient.

[0006] On the other hand, social issues include those relating to the environment and resources. One of the methods is a method for treating sludge from rivers, lakes, bays, and seas, and sludge-like high-moisture soil such as activated sludge used for wastewater treatment (hereinafter, simply referred to as “sludge”). Is removed by a centrifugal separator or the like, and then mixed with coke and incinerated at a high temperature of about 1200 ° C., but when incinerated in this way, residual molten slag is generated.

[0007] Some of the residual molten slag is used as a roadbed material for roads and the like, but at present it is generally treated as waste. At the same time, waste tires and window frames of scrap cars, which have become social issues, are only 40% of the total heat used as fuel.
At present, it cannot be said that they are reused.

[0008]

That is, in the prior art, a hard block has a lot of danger when it falls down, and it is easy to easily feel fatigue when walking. For elastic blocks,
Bad walking feeling and slippery when the surface is wet. In the mixed block of soft and hard aggregates, the slip resistance is not sufficiently improved, and the slipperiness when the surface is wet is not sufficiently improved. Furthermore, it is hard to say that the sludge is sufficiently treated and reused in terms of the treatment of the sludge and the reuse of waste tires and window frames of scrapped vehicles.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and a first object of the present invention is to provide a pavement block and a pavement body using sludge effectively as a resource. It is in.

A second object of the present invention is to provide a pavement block which is safe against falling down and the like, does not slip easily even when wet, and has an excellent walking feeling, and its pavement.

[0011]

In order to achieve the above object, the present invention relates to a pavement block in which a hard aggregate and a soft aggregate are formed via a binder, wherein a sludge-like high moisture soil is used as the hard aggregate. It is characterized in that a crushed product of residual molten slag which is mixed with coke and fired is used.

In this case, the soft aggregate may be an aggregate having elasticity and / or shock absorption, for example, a rubber chip obtained by crushing a waste tire, a crushed product of a window frame rubber of a scrap car, and a wire covering. Rubber crushed products, vulcanized rubber crushed products,
Urethane pulverized products can be used. Further, as the binder, urethane prepolymer, soft epoxy resin,
A peroxide-crosslinkable acrylic resin, a soft polyester resin, or an asphalt emulsion can be used.

The pavement block uses sludge-like high-moisture soil and coke as a hard aggregate, uses crushed residual molten slag, and uses as a soft aggregate waste tires and scrap cars. At least one of a window frame rubber, a rubber for covering electric wires or a crushed urethane, and a mixture of these mixtures with a binder, followed by molding in a mold.

The pavement block is preferably constructed by laying a cushion layer on a roadbed, arranging the blocks on the cushion layer, and filling the space between the blocks with joints.

[0015]

According to the above construction, sludge-like high-moisture soil and coke are mixed and baked as hard aggregate, and pulverized residual molten slag is used, so that so-called sludge can be effectively reused. Becomes possible.

Also, since the characteristics of the residual molten slag and the bonding structure with the binder with the soft aggregate can provide an appropriate elasticity, it is possible to reduce the danger of falling and obtain an excellent walking sensation. In addition, it is possible to obtain a property that it is difficult to slip when wet, and because the above-mentioned joint structure produces water permeability, it is possible to guarantee comfort as a pavement.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a pavement body on which a pavement block (hereinafter, simply referred to as a block) according to the embodiment is laid. 3, the blocks 1 are formed in a substantially rectangular parallelepiped shape as shown also in the cross-sectional view of FIG. 3, and are laid on the roadbed 2 with the cushion layers 3 interposed therebetween. The gap between the blocks 1 is filled with joints 4.
As the joints 4, crushed slag, sand, mortar, and the like, which will be described later, are used.

The hard aggregate used for the block 1 is as follows.
After removing the water content of the sludge (sludge-like high moisture soil) with a centrifugal separator, it is mixed with coke, incinerated at around 1200 ° C, and the remaining molten slag is quenched with water and pulverized. It is as shown in Table 1.

[0019]

[Table 1] As the soft aggregate, a rubber chip obtained by grinding a waste tire chip was used. Table 2 shows the particle size distribution.

[0020]

[Table 2] As a binder, a prepolymer obtained by reacting 1 mol of polypropylene glycol (mixture of molecular weight = 1000 to 2,000) with 3 mol of crude diphenylmethane diisocyanate was used. The properties of this prepolymer are as follows.

NCO group content: 9.0% Viscosity (25 ° C.): 4000 cps These were weighed in accordance with a predetermined blending ratio, and the mixed material was put into a 100 × 200 × 40 mm mold and heated at 150 ° C.
For 15 minutes to obtain a substantially rectangular parallelepiped block 1 as shown in FIGS. The compounding ratio (volume ratio) of each example is as follows. << Example 1 >> Prepolymer 1, Granulated slag 1, Rubber chip
9 << Example 2 >> prepolymer 1, granulated slag 3, rubber chip
7 << Example 3 >> prepolymer 1, granulated slag 5, rubber chip
5 << Example 4 >> prepolymer 1, granulated slag 7, rubber chip
3 << Example 5 >> prepolymer 1, granulated slag 9, rubber chip
1 In the comparative example, the respective materials were mixed according to the following compounding ratio (volume ratio).
It was placed in a 00 × 40 mm mold and heated and pressed at 150 ° C. for 15 minutes. <Comparative Example 1> Prepolymer 1, rubber chip 10 <Comparative Example 2> Prepolymer 1, rubber chip 7, Tamashikashima No. 2 3 <Comparative Example 3> Prepolymer 1, rubber chip 5, Tamashikashima No. 2 5 <Comparative Example 4> Prepolymer 1, rubber chip 3, Tamashikashima No. 2 7 For each of Examples 1 to 5 and Comparative Examples 1 to 4, the respective slip resistances and impact accelerations in dry and wet states were measured. Table 3 shows the results. In addition, the thing of a concrete flat plate and asphalt pavement were shown together as a reference of the comparative example.

[0022]

[Table 3] For slip resistance, a skid resistance tester (BPN) was used. For shock absorption,
This was performed according to JIS A6519.

According to a study by Professor Hidetoshi Ono of Tokyo Institute of Technology, the upper limit of the maximum acceleration, which is considered to be safe, is 100G. It is known that the risk of an accident is high. Regarding the hardness of this Ono type fall,
"Study on Elastic Strength of Gymnasium Floor (Part 5)" is reported in Architectural Institute of Japan, 227, 1975, etc.

According to this criterion, it can be seen that Examples 1, 2 and 3 shown in Table 3 are particularly preferable because the impact acceleration Gmax is 100 G or less. The slip resistance when wet is 62 or more in all examples, but is 60 or less in all comparative examples.

From these considerations, it can be seen that the compositions of Examples 1 to 3 are suitable in any case. It can also be seen that the impact acceleration Gmax becomes 100 or less when the mixing ratio of the granulated slag and the rubber chips is about 60 vol% or less in volume ratio of the rubber chips.

Here, referring to FIG. 2 in which the block 1 is microscopically enlarged, the granulated slag 5 and the rubber chip 6 are joined by a binder 7 in a substantially point contact state. Thereby, in addition to the elasticity of the rubber chip 6, structural elasticity is exhibited, the impact acceleration Gmax becomes smaller, and the walking ease and the safety at the time of falling are secured.

Further, since the blocks are joined by point contact, the blocks have water permeability when formed, and the water permeability eliminates the occurrence of water pools during rainfall. As a result, rain during rainfall is returned to the ground, natural destruction is suppressed,
This prevents abnormal running water and eliminates discomfort such as splashing.

In the above embodiment, granulated slag is used as the hard aggregate, but slag mechanically crushed may be used as described in Table 1 (mechanical crushing). By using sludge and waste tire chips in this way, waste of resources can be prevented and reused.
Note that, instead of the waste tire chips, window frame rubber of a waste vehicle, rubber for covering electric wires, and crushed urethane can also be used. Of course, it is needless to say that a pulverized product of vulcanized rubber having an arbitrary composition may be used.

[0029]

As described above, according to the present invention,
The following effects are obtained. That is, according to the first aspect of the present invention, it is possible to effectively use resources by using a crushed residual molten slag which is obtained by mixing sludge-like high moisture soil and coke as a hard aggregate and firing. And contribute to the prevention of environmental pollution. In addition, the property of the residual molten slag makes it difficult to slip when wet and makes walking easier.

According to the second aspect of the present invention, the soft aggregate has impact-absorbing properties such as waste tire chips, crushed products of window frame rubber of used vehicles, crushed products of wire covering rubber, and crushed products of urethane. By using the aggregate, in addition to the effect of the invention described in claim 1, the risk of a fatal accident at the time of falling can be eliminated as much as possible.

According to the third aspect of the present invention, as the binder, at least one of urethane prepolymer, soft epoxy resin, peroxide-crosslinkable acrylic resin, soft polyester resin, and asphalt emulsion is used. As a result, the binder joins the hard aggregate and the soft aggregate in a so-called point contact state,
Since the soft aggregate itself has elasticity structurally in addition to the elasticity of the soft aggregate itself, it is possible to further improve the shock absorption in addition to the effect of the first aspect of the present invention. In addition, since a gap is formed between the hard aggregate and the soft aggregate, rainwater can penetrate into the ground from this gap, preventing natural destruction, suppressing the occurrence of floods and water pools, and making it easier to walk. Can be further improved.

On the other hand, according to the fourth aspect of the present invention, the paving blocks are laid on the roadbed, preferably with a cushion layer interposed therebetween, and the space between the paving blocks is buried with joints to be laid. A pavement having the effects of the invention described in claims 1 to 3 can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a pavement body on which a pavement block according to one embodiment of the present invention is laid.

FIG. 2 is an enlarged view showing a composition of a pavement block according to the embodiment.

FIG. 3 is a sectional view showing the structure of the pavement according to the embodiment.

[Description of Signs] 1 Pavement block 2 Subbase 3 Cushion layer 4 Joint 5 Granulated slag (hard aggregate) 6 Rubber chip (soft aggregate) 7 Binder

────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yoshio Hirayama 1-1-6 Misakihoncho, Hyogo-ku, Kobe-city, Hyogo Prefecture ) Inventor Hideyuki Okuyama 41, Shimizu, Uozumi-cho, Akashi City, Hyogo Prefecture Sumitomo Rubber Fish House Dormitory (56) References JP-A-4-302603 (JP, A) JP-A-55-65603 (JP, A) JP-A-5-43295 (JP, A) JP-A-5-33304 (JP, A) JP-A-7-158005 (JP, A) JP-A-3-119005 (JP, U) (58) Fields investigated (Int) .Cl. ⁶ , DB name) E01C 5/22

Claims (4)

(57) [Claims] 1. A pavement block in which a hard aggregate and a soft aggregate are formed via a binder, wherein the hard aggregate comprises:
A pavement block comprising a pulverized residual slag obtained by mixing sludge-like high-moisture soil and coke and firing. 2. The soft aggregate is made of an aggregate having a shock absorbing property, such as a waste tire chip, a crushed product of a window frame rubber of a scrapped vehicle, a crushed product of a rubber for covering electric wires, and a crushed product of urethane. The pavement block according to claim 1, wherein 3. The binder according to claim 1, wherein the binder comprises at least one of urethane prepolymer, soft epoxy resin, peroxide-crosslinkable acrylic resin, soft polyester resin and asphalt emulsion. A pavement block according to claim 1. 4. A vehicle according to claim 1, wherein the vehicle is mounted on a roadbed.
A pavement, characterized by laying the pavement blocks according to the above paragraph and providing joints between the pavement blocks.