JP3670600B2 - Construction sludge recycling system and recycled crushed stone production method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recycling system for producing recycled crushed stone from construction sludge and a method for producing the recycled crushed stone.
[0002]
[Prior art]
Conventionally, “concrete shells” generated during construction work and “asphalt shells” generated during road repair work are finely crushed with a crusher, etc., and regenerated crushed stone (materials for civil engineering), and this is backfilled for excavation work, etc. It is known to be reused as timber and roadbed material. In addition, construction sludge is a sludge having a high moisture content and fine particles among those discharged along with excavation work related to construction work, and is called inorganic sludge (construction sludge). Mud-like refers to a state in which a standard dump truck cannot be piled up and a person cannot walk on it. In addition, the excavated material generated by excavating natural ground is earth and sand, and the earth and sand is not subject to the waste disposal method. Judgment whether this is earth or sand or sludge is made when it is discharged along with excavation work, and is generally determined by the method of excavation.
[0003]
In existing treatment methods or in many existing facilities, sludge is dehydrated with a dehydrator, separated into sand, water, etc., and the extracted “sand” is reused in cement factories, raw concrete aggregates, etc. ing. The sand reuse rate is about 6% of the total construction sludge. Most of the remaining residue is “moisture”, and this water is treated and then discharged to the on-site water spray and sewer. In addition, some sludge is left as residue, but these are disposed of in landfills. In the dehydration process, new waste is created.
[0004]
By the way, construction sludge has not been designated as a designated by-product of construction by-products such as construction generated soil and concrete and asphalt shells, but the Ministry of Construction has made efforts to suppress generation and promote recycling in accordance with these. Instruction is given. According to a survey by the Ministry of Health and Welfare in 1996, construction waste in all industrial waste was 19%, the second highest after 19.8% in the electricity, gas and heat supply industries. The percentage of construction sludge in these construction wastes is about 10%, most of which is emitted from public civil works. The recycling rate of this construction sludge is very low at 6% of the emission, which is extremely bad compared to 81% for asphalt shells and 65% for concrete shells. The main reason for this is that construction sludge is not designated as a designated by-product or recycled resource in the recycling law for asphalt shells, concrete shells, construction soil, etc. This is because there was no effective reuse method or processing method.
[0005]
In addition, as a method for recycling construction sludge, construction sludge is recovered and the sand contained is separated and removed, then cement is mixed, the dehydrated solids are crushed, and pulverized to produce a backfill material. A method is known (for example, see JP-A-11-210019).
[0006]
[Problems to be solved by the invention]
However, in the conventional method for producing backfill material from construction sludge as described above, waste is still generated and the recycling is not 100%.
The present invention has been made to solve this problem, and provides a construction sludge recycling system and a method for producing recycled crushed stone, which enables 100% recycling using construction sludge as a recycled resource (recycled crushed stone). For the purpose.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a recycling system for generating recycled crushed stone from construction sludge. In the recycling system for collecting reclaimed crushed stone, relatively large particles of sand, stone, concrete shells, etc. Sorting means for once separating and removing coarse sand, sludge after removal, aggregate made of recycled crushed stone crushed by the pulverizing means described later as a solidification aid, kneading means for kneading cement, and solidifying the kneaded sludge The recycled construction waste consisting of drying means for drying in the sun until it is solidified, the solidified concrete dried and solidified as described above, and the mass sorted by the sorting means has a certain size as recycled crushed stone (product) And a pulverizing means for pulverizing to a particle size.
[0008]
In the above configuration, construction sludge generated in public civil engineering works, etc., kneaded together with aggregates made from recycled crushed stone and cement by kneading means (mixer etc.) and kneaded into a ready-mixed concrete, solidified by sun drying, The obtained concrete solidified material is pulverized by a pulverizing means (crusher or the like) to obtain recycled crushed stone (product: recycled roadbed material or the like). Here, recycled crushed stone is used as the aggregate of concrete, and the recycled construction waste consisting of the lump selected by the sorting means is crushed into recycled crushed stone, so when generating recycled crushed stone from construction sludge , 100% recycling is possible without any other waste (water, sludge).
[0009]
The invention according to claim 2 is a recycling system for generating reclaimed crushed stone from construction sludge, and a sorting means for separating and removing a lump of relatively large particles of sand, stone, concrete shells, etc. from the collected sludge, Stirring means for adding cement to the sludge after removal and stirring, dewatering means for dewatering the stirred sludge and separating it into sand (dehydrated cake) and water, and water discharged as a residue when dewatered by the above , Aggregates made of recycled crushed stone pulverized by a pulverizing means described later as a solidification aid, kneading means for kneading cement, drying means for drying the sun-kneaded material to natural solidified product, and drying by the above there solidified product was, concrete shell, regeneration construction waste consisting asphalt shells, and sand has been separated by the dehydration means (dehydrated cake), as Crushed (product) It is obtained by a grinding means for grinding each time the size of the particle size.
[0010]
In the above configuration, in addition to claim 1, the stirred sludge is dehydrated by dehydrating means, separated into sand (dehydrated cake) and water, dried and solidified to produce regenerated crushed stone, and sand ( Since the dewatered cake) is pulverized together with the construction waste for recycling to generate recycled crushed stone, the sludge treatment capacity is improved.
[0011]
The invention according to claim 3 is a method for producing reclaimed crushed stone from construction sludge, and temporarily collects lump of sand, stone, concrete shell, etc. having relatively large particles and coarse sand from the recovered construction sludge. A step of removing, a step of kneading the sludge after the removal, an aggregate made of recycled crushed stone pulverized by a pulverizing means described later as a solidification aid, and a step of cementing, and a step of drying the sun until the kneaded sludge is solidified. And crushing the concrete solidified material obtained by drying and solidifying as described above and the construction waste for recycling consisting of the mass sorted by the sorting means to a particle size of a certain size as recycled crushed stone (product). It consists of. In this method, an effect equivalent to that of the first aspect can be obtained.
[0012]
Further, the invention according to claim 4 is a method for producing recycled crushed stone from construction sludge. In the production method for separating reclaimed crushed stones, a separation step of separating and removing lumps of relatively large particles such as sand, stone, and concrete shells from the collected sludge; A step of adding cement to the removed sludge and stirring, a step of dehydrating the stirred sludge and separating it into sand (dehydrated cake) and water, and water that has been left as a residue upon dehydration, and solidifying A step of kneading the aggregate composed of recycled crushed stone pulverized by means of pulverization as described later and a cement, a step of drying the sun-kneaded material into a natural solidified product, a solidified product dried by the above, concrete shell, regeneration construction waste consisting asphalt shells, and sand has been separated by the dehydration means (dehydrated cake), a certain degree as Crushed (product) It is made of a step of crushing can of granularity. In this method, an operation equivalent to that of the second aspect is obtained.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a construction sludge recycling system and a method for producing recycled crushed stone according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows the basic processing flow of a construction sludge recycling system. Construction sludge is a sludge with high moisture content that is generated by excavation work such as construction and civil engineering, and is a sludge that is fine in particles, or a concrete structure demolition work, etc. It is inorganic sludge generated mainly by construction-related work, such as wastewater mixed with fine concrete powder generated by construction or concrete washing water discharged when a plant is washed in a concrete plant.
[0014]
In FIG. 1, the construction sludge is collected from the discharger (# 1) through the collection carrier (# 2), checked for acceptance (# 3), and sand and debris are sorted by the receiving hopper (# 4) ( # 5) Stir in a sludge water tank (# 6), knead sludge, aggregate and cement in a mixer (# 7), then dry and solidify in the sun (# 8). By crushing the solidified solidified concrete (# 9), it is used as recycled crushed stone (product: recycled roadbed material, etc.) (# 10), and this is sold to general contractors (# 11).
[0015]
FIG. 2 shows a construction sludge recycling system according to the first embodiment. The building sludge thrown into the sludge storage tank 1 is sent to a gravel sorter 2 (one of sorting means) by a pump to sort and remove rocks, concrete shells, asphalt shells and the like. The screened and removed mass is collected as recycling construction waste 13 , and these are sent to a crusher 8 (crusher: crushing means). What is crushed to an appropriate size by the crusher 8 becomes the finally obtained recycled aggregate 9 (product), and is partially used as a solidification aid described later. The construction sludge from which a large lump has been removed by the gravel sorter 2 is sent to a sand screen 3 (one of sorting means), where the relatively coarse sand 10 in the construction sludge is sorted and removed. This sand 10 is collected as recycling construction waste 13.
[0016]
The construction sludge from which the sand has been removed as described above is sent to the stirring tank 4 where it is stirred. Furthermore, this construction sludge is charged and kneaded into the mixer 6 (kneading means) together with the cement from the silo 5 and the recycled aggregate 9 as the solidification aid, and is naturally dried and solidified in the sun drying facility 7 (drying means). The The solidified construction sludge solidified is pulverized to an appropriate size by a crusher 8 (crusher: pulverizing means) to become a regenerated aggregate 9 (product: regenerated roadbed material). The lump sorted by the sorting means is pulverized by the crusher 8 together with the construction waste 13 for recycling (concrete shell, asphalt shell, etc.) to generate recycled aggregate 9.
[0017]
FIG. 3 shows a construction sludge recycling system according to the second embodiment. This example uses a dehydrator. The building sludge thrown into the sludge storage tank 1 is pumped to a gravel sorter 2 (one of sorting means), and sorts a lump such as stone or concrete shell. After the above sorting, sand 10 having relatively coarse particles in construction sludge is sorted by sand screen 3 (one of sorting means). Stones and concrete shells selected by these are sent to a crusher 8 (crusher: crushing means), where they are crushed to a certain size as recycled crushed stone (product), and recycled aggregate (regenerated roadbed material). Nine. The construction sludge from which the sand has been removed is put into the stirring bowl 4 (stirring means) together with the cement from the silo 5 and stirred. Thereafter, the construction sludge is dehydrated through a dehydrator 11 (dehydration means). The dewatered sand (dehydrated cake) is pulverized by the pulverizer 8 (crusher: pulverizing means) together with the construction waste 13 for recycling (concrete shell, asphalt shell, etc.) to a certain size particle size as recycled crushed stone (product). To do. Thereby, the reproduction | regeneration aggregate 9 (reproduction | regeneration roadbed material) is produced | generated.
[0018]
On the other hand, in parallel with the treatment via the dehydrator 11, excess water dehydrated by the dehydrator 11 is sent to the mixer 6 (kneading means) through the separated water storage tank 12 by a pump. In this mixer 6, the surplus moisture is kneaded together with the cement from the silo 5 and the recycled aggregate 9, and is naturally dried and solidified in the sun drying facility 7. The solidified construction sludge solidified product is pulverized to an appropriate size by a pulverizer 8 and reused as recycled aggregate 9 (regenerated roadbed material).
[0019]
As described above, the lump such as stone or concrete shell selected from the construction sludge is sent to the pulverizer 8 to be crushed to be recycled aggregate (regenerated roadbed material) 9, and the ludge is removed. Is dehydrated by the dehydrator 11 and separated into sand (dehydrated cake) and water, and recycled crushed stone 9 is generated from each of them, so that 100% of sludge can be recycled. The present invention is not limited to the configuration of the above embodiment, and various modifications can be made.
[0020]
【The invention's effect】
As described above, according to the construction sludge recycling system and the method for producing recycled crushed stone according to the present invention, the construction sludge, cement and recycled crushed stone as aggregate are put into the kneading means for kneading the concrete to be kneaded into green concrete. , Solidified by sun-drying, pulverize the obtained concrete solidified material to recycle crushed stone (recycled roadbed material as a product), and use aggregate made of reclaimed crushed stone as concrete solidification aid Therefore, all of the construction sludge is used for regeneration, and no other waste (water, sludge) is produced, and 100% recycling is possible.
[Brief description of the drawings]
FIG. 1 is a diagram showing a basic processing flow by a construction sludge recycling system according to the present invention.
FIG. 2 is a configuration diagram of a construction sludge recycling system according to the first embodiment of the present invention.
FIG. 3 is a configuration diagram of a construction sludge recycling system according to a second embodiment of the present invention.
[Explanation of symbols]
2 Gravel sorter (sorting means)
3 Sand screen (sorting means)
4 Stirrer (stirring means)
6 Mixer (kneading means)
7 Sun drying facilities (drying means)
8 Crusher (Crushing means)
9 Recycled aggregate (recycled roadbed material)
10 coarse sand 11 dehydrator (dehydration means)
13 Recycling construction waste

Claims (4)

In a recycling system that generates recycled crushed stone from construction sludge,
A sorting means for once separating and removing relatively large particles of sand, stone, concrete shells and coarse sand from the recovered construction sludge;
Kneading means for kneading the sludge after the removal, an aggregate made of recycled crushed stone pulverized by the pulverizing means described later as a solidification aid, and cement;
Drying means for drying in the sun until the kneaded sludge is solidified;
Pulverizing means for pulverizing the concrete solidified material dried and solidified as described above and the construction waste for recycling consisting of the mass sorted by the sorting means to a particle size of a certain size as recycled crushed stone (product); Construction sludge recycling system characterized by comprising In a recycling system that generates recycled crushed stone from construction sludge,
Sorting means for separating and removing relatively large particles of sand, stone, concrete shells, etc. from the recovered sludge;
A stirring means for adding and stirring cement to the sludge after the removal;
Dewatering means for dewatering the stirred sludge and separating it into sand (dehydrated cake) and water;
Kneading means for kneading water, which is produced as a residue when dehydrated as described above, an aggregate made of recycled crushed stone crushed by a pulverizing means described later as a solidification aid, and cement;
A drying means for drying the sun-kneaded material to the natural solidified product,
Recycled solidified material, concrete shells, asphalt shells , and construction waste for recycling, and sand (dehydrated cake) separated by the dewatering means are crushed to a certain size particle size as recycled crushed stone (product) A construction sludge recycling system comprising a pulverizing means. In a production method for producing recycled crushed stone from construction sludge,
A step of separating and removing a lump of relatively large particles of sand, stone, concrete shells and coarse sand from the recovered construction sludge;
Kneading the sludge after the removal, an aggregate made of recycled crushed stone pulverized by the pulverizing means described later as a solidification aid, and cement;
Sun drying until the kneaded sludge is solidified;
From the step of pulverizing the concrete solidified material that has been dried and solidified as described above and the construction waste for recycling composed of the mass sorted by the sorting means to a particle size of a certain size as recycled crushed stone (product). A method for producing recycled crushed stone, comprising: In a production method for producing recycled crushed stone from construction sludge,
A separation step for separating and removing relatively large particles of sand, stone, concrete shells, etc. from the recovered sludge;
Adding cement to the sludge after removal and stirring;
Dehydrating the stirred sludge and separating it into sand (dehydrated cake) and water;
Kneading the water produced as a residue when dehydrated as described above, an aggregate made of reclaimed crushed stone pulverized by a pulverizing means described later as a solidification aid, and cement;
A step of sun-drying the kneaded product to form a natural solidified product,
Recycled solid waste, concrete husk, asphalt husk waste, and sand (dehydrated cake) separated by the dewatering means are crushed to a certain size as recycled crushed stone (product). A method for producing recycled crushed stone comprising the steps of:

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