JPH0689541B2 - Construction residual soil disposal method and water solidified soil - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a construction residual soil disposal method for effectively disposing of waste soil required for disposal discharged from a construction site, and a water-solidified soil produced additionally. .

[Conventional technology]

Conventionally, in the case of constructing a high-rise building, it is common to provide a basement, and in order to form the second floor and the third floor, the excavated site soil is generally shipped by truck and discarded.

Construction surplus soil that this is discarded, for example, even try only to Tokyo, rising to 1987 fiscal year 5.66 million m ^3, 63 fiscal year 6.46 million m ^3, and see this in another department, sewer stations 9.62 million m ^3, Waterworks 275 ten thousand m ^3, construction Bureau 1.47 million m ^3, the high-speed train construction headquarters 1.15 million m ^3, Treasury 1.09 million m ³
Therefore, the amount will be enormous if private construction is added.

In the past 8 years, as landfill waste for construction in Tokyo, loading at the Haneda offshore landfill 19,270 km ³ , loading at the Kasai offshore landfill 2,460 km
^{3. From} 1989, head to Haneda Offshore Reclaimed Land for 3,0
00km ^3, from 1991 up to seven years, and has a plan to carry the year 3,000,000 m ³ to the Central Breakwater outside the district.

These residual soil treatments are simply dumped in landfills, but of course an outer shell construction work is also required for that purpose.

According to the public works soil volume survey data of the Kanto Regional Construction Bureau of the Ministry of Construction, the amount of soil taken out and the destination of public construction from 1984 to 1986 is 10,635 km ³ , 46% in Tokyo and 3.5 in Kanagawa.
%, Saitama 16.7%, Chiba 31%, and other 2.8%, and the actual situation is that the majority of construction waste in Tokyo requires other prefectures to dispose of it.

[Problems to be Solved by the Invention]

As mentioned above, the first problem with the disposal of construction soil in Tokyo is the shortage of waste land. Based on this, illegal dumping, environmental destruction due to collapse of embankments, etc., and related acceptance by the receiving prefecture It has become a big social problem such as rejection reaction.

In view of these circumstances, the present invention aims to provide a construction residual soil disposal method for disposing of the residual soil by commercializing the residual soil itself and converting it to a new construction material, and an accompanying water-solidified soil produced. It was developed.

[Means for Solving the Problems]

The present invention has taken the following means in order to solve the above problems.

(1) Construction residual soil is dried to a moisture content of 13% or less to obtain dried residual soil, and 20 to 40 parts by weight of carboxymethyl cellulose, 20 to 40 parts by weight of calcium chloride, and 20 to 40 parts by weight of sodium metasilicate powder per 1 m ^{3 of the} dried residual soil. 7-20 kg of Portland cement 250-400 kg of coagulant consisting of the mixture of above is mixed and stored in a waterproof bag, then sealed and disposed of as water-solidified soil.

(2) Construction residual soil is dried to a moisture content of 13% or less to obtain dry residual soil, and 20 to 40 parts by weight of carboxymethyl cellulose, 20 to 40 parts by weight of calcium chloride and 20 to 40 parts by weight of sodium metasilicate powder per 1 m ^{3 of the} dry residual soil. The coagulant consisting of the mixture of 7 to 20 kg of Portland cement 250 to 400 kg was added and mixed, stored in a waterproof bag, sealed, transferred to the dump site as water-solidified soil, and a water passage hole was opened in the waterproof bag. Dumped,
A method of disposing of construction surplus soil, which is watered when necessary.

(3) Drying the construction residual soil to a moisture content of 13% or less, and from a mixture of 20 to 40 parts by weight of carboxymethyl cellulose, 20 to 40 parts by weight of calcium chloride and 20 to 40 parts by weight of sodium metasilicate powder per 1 m ^{3 of the} dry residual soil. A coagulant consisting of 7 to 20 kg and 250 to 400 kg of Portland cement added and mixed, and then sealed and sealed in a waterproof bag.

However, the term "construction surplus soil" refers to loamy soil (sand, silt, clay), sand soil (including shirasu, river sand, sea sand), fine-grained soil (including Kanuma soil, Akadama) among general construction surplus soil. Soil, silt, shirasu), fine-grained rock soil (rock with a grain size of 2 cm or less, boulders, soil containing concrete lumps) refers to small particles.

[Action]

In the means of (1) above, the water-solidified soil is dry residual soil,
The mixture of coagulant and Portland cement is contained in a waterproof bag, so adding water to it will turn it into soil concrete in 24 hours.

That is, the dry residual soil becomes an aggregate of concrete, and Portland cement has an action of converting the aggregate into concrete. Carboxylcellulose in the coagulant has a part of -OH of the cellulose is -OH ₃ , is water-soluble and has high adhesiveness, and in particular, it uniformly enters between soil fine particles of dry residual soil and cellulose molecules Are bundled and arranged densely to make fine crystals (micelles). Since there are no gaps in the micelles to break even the water molecules, it has the effect of enhancing the bond even in geological soil that lacks viscosity.

Sodium metasilicate powder is hydrolyzed to form a syrup, which penetrates between each component of the soil of the dry soil to promote hydrogen bonding and enhance the coagulation action of cement.

Calcium chloride has a quick binding action for calcareous and siliceous components of cement, and has a function of coagulating cement in a short time after hydrolysis.

Therefore, if this water-solidified soil is sprayed by rainwater on slopes and gardens where sand flows, laminated and sprayed, it will solidify in 24 hours and become soil concrete. If you spray it on the contour of the flowerbed, the flowerbed will not collapse due to rainwater.

If sprayed on landslides, the surface will become soil concrete.

When dumped in a landfill, it solidifies spontaneously to form a hard strata.

When mixed with sludge, it has the effect of solidifying sludge.

If it is stacked on the riverbed, it becomes a bank.

In this way, the construction residual soil becomes a new construction material, and the disposal act can be substituted for the construction act.

The means of (2) is to dispose the waterproof bag of water-solidified soil by disposing the perforation hole and dispose of it. Even if the entire sachet is discarded within 24 hours because water enters through the perforation hole. It solidifies and is used as a revetment, breakwater construction and landfill material.

In the means of (3), the construction residual soil becomes a construction material called water-solidified soil, which has a simple paving action when sprayed, and a revetment and wave preventing action when laminated on the waterside.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. Figure 1 shows the construction site. Excavated soil 2 discharged from the construction site 1 by excavation remains as construction soil except for backfilling to the site.

Dry soil 2A is obtained by carrying the construction soil 2 to the dryer 3 and drying it until the water content is 13% or less.

A coagulant consisting of a mixture of 20 to 40 parts by weight of carboxymethyl cellulose, 20 to 40 parts by weight of calcium chloride, 20 to 40 parts by weight of sodium metasilicate powder, and 7 to 20 kg of Portland cement 250 to 400 kg were added and mixed with 1 m ^{3 of the} above-mentioned dry soil. Then, the water-solidifying mixed soil 2B was housed in a waterproof bag 4 and sealed to obtain a water-solidifying soil 5.

The dryer 3 can be dried at a low cost by using, for example, the residual heat of the refuse incinerator, but a dryer for general aggregate for concrete may be used, or sun drying may be used.

The mixing ratio of the coagulant may be an equal amount of the three, or one
The composition may be 40 parts, and it will be selected according to the quality of the remaining construction soil.

For example, in the case of soil with low viscosity, increase carboxymethyl cellulose. If Portland cement is hardened quickly, increase calcium chloride. Increase sodium metasilicate to increase strength. For general loam quality, an equal amount is sufficient.

The amount of coagulant compounded per 1 m ^{3 of} construction soil is 7-
Use within the range of 20 kg. 8 for general loamy soil
12 kg is enough. If the soil has a small grain size, such as mulch soil, black soil, or a large amount of gravel with a large grain size, the amount used is 13 to 20 kg.

The mixing amount of Portland cement per 1 m ^{3 of the} construction residual soil is 250 to 400 kg depending on the soil quality. For general loamy, 250 to 270 kg is sufficient, but if it contains a lot of organic soil such as mulch and black soil and gravel, 300 to 400
Use kg of cement to ensure complete cure.

As the waterproof bag 4, a bag having excellent waterproof property such as a cement bag is used.

Figure 5 shows the revetment work as a disposal site for the water-solidified soil 5.
That is, a seawall is shown to prevent the beach 7 from being washed and eroded by the waves of the sea 8. The water-solidified soil 5 transported to the site is passed by nails or other materials as shown in FIG. Water holes 6,6 ...
After piercing, laminate at the time of waving. As a result, seawater intrudes into the water-solidified soil 5 in the portion A submerged in the water through the water passage holes 6. When water is sprinkled on the water-solidified soil 5 of the water upper part B which is not soaked with water by a bucket or a hose of a pump, the water permeates through the water passage holes 6.

Then, some of the water-solidified soil 5 ... Is sprayed from above the water-solidified soil 5 ...

If this is left for 24 hours, the water-coagulable mixed soil 2B in the waterproof bag 4 reacts with the mixed coagulant and the water that the Portland cement has permeated and hardens, and by spraying the water-solidified soil. The water-solidifying soil that has entered the gap between 5, 5, ... And the water-solidifying mixed soil formed in the layered 5A on the upper surface portion connect the entire water-solidifying soil 5.

As described above, this revetment works only by forming the water passage holes 6 in the waterproof bag 4 of the water-solidified soil 5, stacking them, and spraying water.
Is built in 24 hours.

The compressive strength of the water-solidified soil 5 after 24 hours of this construction is the uniaxial compressive strength test (kg / c) for the specimen (5φ × 10 cm).
m ²⁾ was a result of the strength of 1.4kg / cm ² ~1.6kg / cm ² was observed. As a result of the strength test on the 7th day after the construction, the compressive strength was 20.5 kg / cm ² .

In this way, it is possible to obtain considerable strength in a short time after construction, so it is suitable for urgent revetment work, such as revetment work for rivers destroyed by floods, and of course permanent revetment work as waste material. It can be constructed using the remaining construction soil.

FIG. 6 shows a dike repair work as a disposal site for the water-solidified soil 5. That is, when a part of the embankment 10 of the river is destroyed by the flood, the water-solidified soil in which the water-permeable holes 4 are formed in the waterproof bag 4 as shown in FIG. 5
Are stacked. In addition to the waterproof effect only in this laminated state,
Water permeates into the waterproof bag 4 through the water passage holes 6 with time and solidifies, and after 24 hours, it is the same as stacking concrete blocks.

FIG. 7 shows a landfill as a disposal site for the water-solidified soil 5.

A weir 12 made of steel sheet pile or the like is provided in the landfill 11, and as shown in FIG. 4, water-solidified soil 5 having perforations 6 formed in the waterproof bag 4 is dropped and the waterproof bag 4 is occasionally torn. Disperse the mixture 2B inside and fill up. By sprinkling water on the surface layer, the water-solidified soils 5 in the underwater portion A and the water upper portion B are solidified with time, and a strong landfill can be easily constructed like a concrete block.

FIG. 8 shows a slope pavement as an example of using the water-solidified soil 5.
Since rainwater causes soil on the slopes to flow out and the road surface to be dug, the runoff sediments rivers and sewers, causing a disaster. It is difficult for an amateur to pave such a slope on asphalt or cement concrete.

However, as shown in FIG. 8, the waterproof bag 4 shown in FIG.
Water-solidified soil 5 with water holes 6 drilled in it ...
The water-coagulable mixed soil 2B, which is laid out on the A, 13A and vertically arranged between the aligned water-coagulated soils 5, 5, is sprayed in layers to form the layered portion 13B ... To do. With this alone, the soil concrete pavement and the stairs will be completed over time.

In this case, as shown in FIG. 9, the water passage can be paved by forming the layered portion 13B on the surface of the groove portion 13C as well.

FIG. 10 shows a landslide prevention work as an example of using the water-solidified soil 5.

Anchor holes 14A are drilled in the landslide slope 14, and water-solidifying soil 5 with a water passage hole 6 is put into the waterproof bag 4 as shown in FIG. When the water-solidifying mixed soil inside is broken and the water is sprinkled into the gap, the anchor 15 is formed over time. Slope 14 around the anchor 15
Then, when the waterproof bag 4 is broken and the water-coagulable mixed soil therein is sprayed in layers to spray water, a concrete surface layer 14B is formed.
Since water does not permeate into the concrete surface layer 14B, rain does not permeate into the ground even if it rains, so landslides are less likely to occur.

FIG. 11 shows a usage example of the water-solidified soil 5. The water-solidified soil 5 as shown in FIG. 3 can be used as a household gardening material when it is made into a sachet. For example, as shown in Fig. 11, the flowerbed 16
When it is desired to form the boundary 17 in the peripheral portion 16A of the above, the upper part of the waterproof bag 4 is cut open sideways, water is poured therein, and the mixture is stirred and kneaded with a transplanting iron. The kneaded material is scooped out with a trowel or hand, placed on the periphery 16A of the flowerbed 16 like an earth tatami mat, shaped, and left for half a day to solidify. After 12 hours, a soil concrete boundary 17 is formed. It can be used like a brick when broken.

FIG. 12 shows an example of using the water-solidified soil 5. The depression 18 is formed in the garden, the upper part of the waterproof bag 4 shown in FIG. 3 is cut, and water is put thereinto and kneaded. Sink the water-solidifying mixed soil kneaded with the water
A coating layer 19 is formed by coating the layer 18 on the layer. Further, the water-solidifying mixed soil kneaded with water is arranged around the depression 18 in the shape of a small mountain 19A. If you leave it for 12 hours, the pond and the mountain are completed, and even if you put water in the pond, there is no water leak like cement concrete and no slag, so you can put goldfish etc. immediately.

The present invention is not limited to the above embodiment and can be used in various fields.

[Effects of the Invention] As described above, the present invention has the following excellent effects.

(1) Although the construction residual soil that does not have a disposal site is changed to a new construction material and is discarded at the construction site, it is effectively used as a material, so the waste material is effectively used as a material. Since there is a great demand for it, it has the effect of becoming an extremely effective disposal method of construction soil.

(2) It can be solidified and hardened just by adding water, so it is easy to use.
Compensation for damaged levee, landfill, etc. can be completed, which has the effect of reducing construction costs.

(3) Since the construction soil becomes aggregate of concrete without using the gravel of the riverbed, there is an effect that natural destruction and waste of resources can be suppressed.

(4) Water-solidified soil can be easily used by civilians and amateurs, and there is no secondary disaster caused by its use, no adverse effects on fish and plants due to the abacus of Tobacco cement, and the finished product has a soil color. Since it does, there is an effect that the landscape is not damaged.

[Brief description of drawings]

1 is a front view of a construction site, FIG. 2 is a front view of a drier, FIG. 3 is a front view of water-solidified soil, and FIG. 4 is a water-permeable hole in a waterproof bag. Front view of the water-solidified soil that has been opened, Fig. 5 is a front view of the revetment work as a disposal site, Fig. 6 is a front view of the embankment repair work as a disposal site, and Fig. 7 is a landfill work as a disposal site. Of FIG. 8, FIG. 8 is a front view of a slope pavement as an example of use of water-solidified soil, FIG. 9 is a cross-sectional view taken along the line AA of FIG. 8, and FIG. 10 is an example of use of water-solidified soil. Fig. 11 is a front view of a landslide pavement work, Fig. 11 is a slope view of a flowerbed boundary construction work as an example of the use of water-solidified soil, and Fig. 12 is a front view of a pond construction work as an example of the use of water-solidified soil. 1 ... Construction site, 2 ... Exhaust soil (remaining construction soil), 2A ... Dry soil, 2B ... Water-solidifying mixed soil, 3 ... Dryer, 4 ... Waterproof bag, 5 ... Water-solidifying soil, 5A ... Layered, 6 ... Water holes, 7 ... Coast, 8 ... Sea, 9 ... Revetment, A ... Underwater, B ... Overwater, 10 ... Dikes, 10A ... Disintegration , 11 …… reclaimed land, 12 …… weir, 13 …… slope, 13A …… staircase, 13B …… layered section, 13C …… groove section, 14 …… landslide slope, 14A …… anchor hole, 14B… … Concrete surface, 15 …… Anchor, 16 …… Flowerbed, 16A …… Environment, 17 …… Boundary, 18 …… Sink, 19 …… Paint, 19A …… Oyama.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-227899 (JP, A) JP-A-56-133384 (JP, A) JP-A-63-184607 (JP, A) JP-A-2- 263890 (JP, A)

Claims (3)

[Claims] 1. Construction residual soil is dried to a moisture content of 13% or less to obtain dry residual soil, and 20 to 40 parts by weight of carboxymethyl cellulose, 20 to 40 parts by weight of calcium chloride and 20 to 40 parts of sodium metasilicate powder per 1 m ^{3 of the} dry residual soil. A method of disposing of residual soil after construction, characterized by adding 7 to 20 kg of Portland cement 250 to 400 kg of a coagulant composed of a mixture of parts by weight, accommodating it in a waterproof bag, sealing and disposing as water-solidified soil. 2. Construction residual soil is dried to a moisture content of 13% or less to obtain dry residual soil, and to 1 m ^{3 of the} dry residual soil, 20-40 parts by weight of carboxymethyl cellulose, 20-40 parts by weight of calcium chloride, and 20-40 parts of sodium metasilicate powder. 7 to 20 kg of Portland cement 250 to 400 kg of a coagulant consisting of a mixture of parts by weight is added and mixed, stored in a waterproof bag, sealed, transferred to a dumping site as water-solidified soil, and a water passage hole is opened in the waterproof bag. Then dumped,
A method of disposing of construction residual soil, which is characterized by sprinkling water as needed. 3. The construction residual soil is dried to a water content of 13% or less, and 1 m ^{3 of the} dried residual soil is mixed with 20 to 40 parts by weight of carboxymethyl cellulose, 20 to 40 parts by weight of calcium chloride and 20 to 40 parts by weight of sodium metasilicate powder. A water-solidifying soil characterized by containing 7 to 20 kg of Portland cement and 250 to 400 kg of a coagulant consisting of a body, and storing and sealing in a waterproof bag.