JPH035513A - Dumping of construction surplus soil and water-frozen soil - Google Patents

Abstract

PURPOSE:To convert a construction surplus soil into a new construction material so as to be effectively disposed of by mixing a coagulant and a Portland cement with the surplus soil dried with its water content reduced to less than a certain value, so as to be stored in a water-proof bag as a water-frozen soil. CONSTITUTION:A construction surplus soil 2 is brought to a drier 3, and is dried until the water content is reduced to 13% or less, so as to obtain a dried surplus soil 2A. To +1m<3> of this dried surplus soil, 7-20kg of coagulant composed of a mixture of each 20-40 weight parts of carboxymethyl cellulose, calcium chloride, metasilicate sodium powder, and 250-400kg of Portland cement are added and mixed together, so as to form a water-frozen mixed soil, which is stored and sealed in a water-proof bag. The water frozen soil is used for levee, earth filling, landslide protection, or for a household gardening materials, and so on. A construction surplus soil having no damping site can be converted into a new construction material, and can be disposed of effectively.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for disposing of construction surplus soil that effectively disposes of surplus soil that needs to be discarded from a construction site, and water-coagulated soil that is produced incidentally. .

[Conventional technology]

Conventionally, when constructing a high-rise building, it is common to provide a basement, and in order to create the second basement floor (31W), the excavated soil at the site is generally transported by truck and disposed of.

For example, in Tokyo alone, the amount of construction waste soil was 5.66 million m' in 1988 and 6.46 million m1 in 1983, and when looked at by sector, 9.62 million m3 of sewage disposal.
Waterworks Bureau: 2.75 million m2; Construction Bureau: 1.47 million m; High-speed train construction headquarters: 1.15 million m3. Finance Bureau: 1.09 million m1,
If you add in private construction, the amount will be huge.

In the past eight years, 19,270 bm' of construction waste has been transported to the Haneda Offshore Landfill, and 2,460 bm' has been transported to the Kasai Oki Landfill for disposal of construction surplus soil in Tokyo. It is planned that 3,000 km' of water, or 3 million m3 per year, will be delivered to the area outside the central breakwater from 1991 to 1997.

The only way to dispose of the remaining soil is to dump it in a landfill, but this naturally requires construction work to create an outer shell.

According to public works survey data from the Kanto Regional Construction Bureau of the Ministry of Construction, the amount of earth and light removed from public works from 1980 to 1988 was 10.635 b', with 46% of the total being carried out within the department.
, Kanagawa 3.5%, Saitama 16.7%, Chiba 31%, and other 2.8%, and the reality is that the majority of construction waste within the department is being disposed of in other prefectures. .

[Problem to be solved by the invention]

As mentioned above, the primary problem with the disposal of construction surplus soil within the department is the lack of disposal sites, and this is the primary cause of environmental damage caused by illegal dumping, collapse of embankments, etc. Rejection, etc., has become a major social problem.

In view of these circumstances, the present invention aims to provide a method for disposing of construction surplus soil by turning the surplus soil into a product and converting it into new construction materials, as well as water-coagulated soil that is produced incidentally. It was developed.

[Means to solve the problem]

In order to solve the above problems, the present invention takes the following measures.

(1) Dry the construction surplus soil to a moisture content of 13% or less to obtain dry surplus soil, and add 20 to 40 parts by weight of carboxymethyl cellulose calcium chloride to 1 m' of the dry surplus soil.
20-40 parts by weight sodium metasilicate powder
A coagulant consisting of a mixture of 20 to 40 parts by weight
7-20 kg Boltland Cement 2
A method for disposing of construction surplus soil in which 50 to 400 kg is added and mixed, stored in a waterproof bag, sealed, and disposed of as water-coagulated soil.

(2) Dry the construction surplus soil to a moisture content of 13% or less to obtain dry surplus soil, and add 20 to 40 parts by weight of carboxymethyl cellulose and calcium chloride to 1 m' of the dry surplus soil.
20-40 parts by weight sodium metasilicate powder
A coagulant consisting of a mixture of 20 to 40 parts by weight
7-20 2 bolt land cement 25
A construction waste disposal method in which 0 to 400 kg is added and mixed, placed in a waterproof bag, sealed, and transported to the dumping site as water-coagulated soil.The waterproof bag is then dumped with water holes drilled and watered as necessary. .

(3) Dry the construction surplus soil to a moisture content of 13% or less, and prepare 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, based on the dried residual soil In'. Mix the coagulant consisting of 7-20 with 2 Volt Land Cement 250-400 kIr,
Water-coagulated soil sealed in a waterproof bag.

However, the construction surplus soil referred to here refers to general construction surplus soil, loam purchase (sand, silt, clay), sandy soil (containing whitebait, river sand, sea sand), fine-grained soil (containing Kanuma soil, Akadama soil). , silt,
whitebait), on fine-grained rocks (rocks with a grain size of 2 am or less, cobblestones,
Refers to small particles such as soil (including concrete lumps).

[Effect]

In the means of (1) above, the water-coagulated soil includes dry residual soil;
Since the mixture of coagulant and Boltland cement is stored in a waterproof bag, when water is added to it, 24
It becomes soil concrete in time.

That is, the dried residual soil becomes aggregate for concrete, and Boltland cement has the effect of converting the aggregate into concrete. The carboxylcellulose in the coagulant has a part of 10H to 3H of cellulose, is water-soluble and has high adhesive properties, and in particular penetrates evenly between the fine particles of dry residual soil and forms cellulose. Molecules bundle together and arrange themselves densely to form microcrystals (micelles). These micelles have no gaps in which even water molecules can get in, so they have the effect of increasing bonding even in geological soils that lack viscosity.

Sodium metasilicate powder is hydrolyzed into a syrup-like form, which penetrates between the various components of the dry residual soil to promote hydrogen bonding and enhance the coagulation effect of cement.

Calcium chloride has the effect of rapidly binding the calcareous and silicic substances that are the components of cement, and has the effect of solidifying cement in a short time after hydrolysis.

Therefore, if this water-coagulated soil is spread, layered, and watered on a slope or garden where rainwater flows, it will solidify in 24 hours and become soil concrete. Spraying on the outline of the flower bed will prevent it from collapsing due to rainwater.

When sprayed on landslides, the surface layer becomes soil concrete.

When dumped in a landfill, it will naturally solidify and form a hard layer.

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

When stacked on a riverbed, it becomes an embankment.

In this way, construction surplus soil becomes new construction material, and the act of disposal is replaced by the act of construction.

The method (2) above involves drilling a water hole in a waterproof bag made of water coagulated soil and then dumping it.Even if the waterproof bag is dumped so that water can enter through the water hole, it will be disposed of within 24 hours. It solidifies and is used for the construction of seawalls and breakwaters, as well as as reclamation material.

In the method (3) above, construction surplus soil becomes a construction material called water coagulated soil, which has a simple paving effect when spread, and has a seawall and wave protection effect when layered on a waterside.

〔Example〕

Embodiments of the invention will be described based on the drawings.

FIG. 1 shows a construction site. The excavated soil 2 discharged from the construction site 1 by excavation becomes construction surplus soil except for filling it back into the site.

The construction surplus soil 2 is transported to the dryer 3 and the moisture content is 13%.
Dry residual soil 2^ can be obtained by drying until the following.

To 1 m' of the dried residual soil, add 7 to 20 kg of 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, and 20 to 40 parts by weight of sodium metasilicate powder, and 250 to 400 kg of Bortland cement. Mix and
The water-coagulable mixed soil 2B was placed in a waterproof bag 4 and sealed to obtain water-coagulable soil 5.

The dryer 3 can be dried at low cost by using residual heat from a garbage incineration furnace, but a general dryer for aggregate for concrete may be used, or drying in the sun may be used.

The mixing ratio of the coagulant may be equal to the amount of coagulant or may be 40 parts of one type, and is selected depending on the quality of the construction surplus soil.

For example, if the soil is less viscous, increase the amount of carboxymethyl cellulose. If you want Boltland cement to harden quickly, add more calcium chloride. When increasing the strength, increase the amount of sodium metasilicate. For typical loamy textures, equal amounts are sufficient.゛The amount of coagulant mixed per 1 m' of construction surplus soil varies depending on the soil quality.
Can be used in the range of ~20 kIr. 8 to 12 hg is sufficient for general loam snow. 13 for soil with low particle size, such as humus, black soil, and large gravel.
Used in the range of 20 to 20.

The amount of Boltland cement mixed per 1 m' of the construction surplus soil is 250 to 400 kg depending on the soil quality. For general loam, 250 to 270 kg is sufficient, but if the cement contains a lot of organic matter such as humus and black soil, as well as gravel, use 300 to 400 kg of cement to ensure complete hardening.

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

FIG. 5 shows a bank protection work as a disposal site for the water-coagulated soil 5.

In other words, it shows a revetment work to prevent the coast 7 from being washed away and eroded by the waves of the sea 8, and the water-coagulated soil 5... transported to the site is attached to the nails and ponds as shown in Figure 4. Water hole 6 with material
, 6... are bored and then laminated on the edge of the waves. As a result, the water-coagulated soil 5 in the submerged portion A is transferred to the water passage hole 6.
Seawater intrudes into the interior. When water is sprinkled with a bucket, a pump hose, etc., water permeates through the water holes 6 to the water solidification ±5... of the water upper part B which is not submerged in water.

Then, some of the water-coagulated soil 5... is sprinkled over the layered water-coagulated soil 5 by tearing the waterproof bag 4 and watering as a layer 5^.

If this is left for 24 hours, the water-coagulable mixed soil 2B in the waterproof bag 4 will harden as the coagulant and Boltland cement mixed with the water permeate, and the water will coagulate by spraying. The water-coagulated soil that has entered the gaps between ±5, 5 and the water-coagulable mixed soil that is formed in layers 5^ on the upper surface connects the entire water-coagulated soil 5.

As described above, this revetment construction can be carried out by simply forming water holes 6 in the waterproof bags 4 of the water coagulated soil 5, layering them, and sprinkling water on the revetment.
will be constructed in 24 hours.

The compressive strength of the water coagulated soil 5 after 24 hours of construction is as follows:
As a result of the uniaxial compressive strength test (lqr/ad) on the specimen (5φX10CII), it was 1.4 kg/aa ~
A strength of 1.6 kg/- was observed. In addition, the results of a strength test of the applied soil showed a compressive strength of 20.5 kg/cd.

In this way, considerable strength can be obtained in a difficult period of time after construction, making it suitable for emergency bank protection works, such as bank protection works for rivers that have been destroyed by floods. It can be constructed using construction surplus soil.

Figure 6 shows the embankment repair work as a disposal site for the water-coagulated soil 5. In other words, when a part of the river embankment 10 is damaged due to a flood, the damaged part 10^ is repaired as an emergency measure. As shown, a water coagulation material ±5 having water passage holes 6... is laminated on a waterproof bag 4. Not only does this laminated state alone provide a waterproof effect, but over time water permeates into the waterproof bag 4 through the water holes 6 and solidifies, and after 24 hours, it is the same as laminating concrete blocks. become.

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

A weir 12 made of steel sheet piles or the like is installed in the reclaimed land 11, and as shown in Fig. 4, water-coagulated soil 5 with water passage holes 6 drilled into waterproof bags 4 is dumped into the waterproof bags 4. 4 is torn apart, mixture 2B inside is scattered, and the mixture is disposed of in a landfill. By sprinkling water on the surface layer, the water-coagulated soil 5 in the underwater part A and the underwater part B solidifies over time, and a strong reclaimed land is easily created like reclaimed concrete blocks.

Figure 8 shows slope paving work as an example of the use of water-coagulated soil 5.
Rainwater washes away earth and sand from slopes, digging up road surfaces and causing disasters when the earth and sand bury rivers and sewers. It is difficult for amateurs to pave such slopes with asphalt or cement concrete.

However, as shown in FIG. 8, the waterproof bag 4 shown in FIG.
The water-coagulated soil 5... with water holes 6 drilled in them are arranged in a step-like manner 13^, 13A on the slope 13, and the waterproof bags 4 are broken between the upper and lower intervals of the arranged water-coagulated soil 5.5. The discharged water-coagulable mixed soil 2B is spread in layers to form layered portions 13B, and then watered. With just this, the soil concrete pavement will be completed over time and the stairs will be completed.

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

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

Anchor holes 14^ are bored in the landslide slope 14, and water-coagulated soil 5 is made by drilling water holes 6 in the waterproof bag 4 as shown in FIG.
. . , separately tear the waterproof bag 4 with a water coagulation rate of ±5, and let the water coagulable mixed soil inside flow into the gap and sprinkle water, and an anchor 15 is formed over time.

A concrete surface layer 14B is formed by tearing the waterproof bag 4 and spreading the water-coagulable mixed soil inside in layers on the slope 14 around the anchor 15 and sprinkling with water.

This concrete surface layer 14B does not allow water to penetrate, so even if it rains, the rain does not penetrate into the ground, making landslides less likely to occur.

FIG. 11 shows an example of how the water-coagulated soil 5 is used. The water-coagulated soil 5 as shown in FIG. 3 can be used as a home gardening material when made into a sachet. For example, when it is desired to create a boundary 17 around the periphery 16^ of the flower bed 16 as shown in FIG. 11, the upper part of the waterproof bag 4 is cut horizontally, water is poured into it, and the mixture is stirred and kneaded with a transplanting trowel. The kneaded material is scooped out with a trowel or by hand, placed on the periphery 16A of the flower bed 16 like a clay mat, and left to solidify for half a day. After 12 hours, a boundary 17 of soil concrete is formed and can be used like a brick.

FIG. 12 shows an example of the use of the water-coagulated soil 5. A depression 18 is formed in the garden, the upper part of the waterproof @ 4 shown in FIG. 3 is cut off, and water is poured into it and kneaded. The water-coagulable mixed soil kneaded with water is applied to the depression 18 in a layered manner to form a coating layer 19. In addition, water-coagulable mixed soil kneaded with water was added to the small mound 19A around the depression 18.
Arrange in a shape. If you leave this for 12 hours, the pond and rockery will be completed.Even if you fill the pond with water, it won't leak like cement concrete, and since no scum will come out, you can immediately put goldfish and other things in it.

This invention can be used not only in the above-mentioned embodiments but also in many other fields.

〔Effect of the invention〕

As explained above, the present invention has the following excellent effects.

(1) Construction surplus soil, which has no place to dispose of, is turned into new construction materials and disposed of at the construction site, but since it is essentially used as materials, the waste materials have the effect of being used as materials, and the materials Since there is a huge demand for this, it has the effect of becoming an extremely effective method of disposing of construction surplus soil.

(2) It solidifies and hardens just by adding water, so it is easy to use, and even the act of dumping it can be used to create structures such as breakwaters, sea walls, etc.
Repairs to damaged embankments, reclamation, etc. can be completed, which has the effect of reducing construction costs.

(3) Construction surplus soil is used as aggregate for concrete without using riverbed gravel, which has the effect of reducing natural destruction and resource waste.

(4) Water coagulated soil can be easily used by civilians and amateurs, and there is no secondary damage caused by its use, and there is no negative effect on fish or plants due to the scum of cement, and the finished product must be packaged. This has the effect of not damaging the landscape.

[Brief explanation of drawings]

The drawings relate to embodiments of this invention, and Fig. 1 is a front view of a construction site, Fig. 2 is a front view of a dryer, Fig. 3 is a front view of water coagulated soil, and Fig. 4 is a water hole in a waterproof bag. A front view of the water-coagulated soil with open holes, Figure 5 is a front view of the bank protection work as a disposal site, Figure 6 is a front view of the embankment repair work as a disposal site, and Figure 7 is a front view of the landfill work as a disposal site. Figure 8 is a front view of a slope paving work as an example of the use of water-coagulated soil, Figure 9 is a sectional view taken along line A-A in Figure 8, and Figure 10 is a front view of a slope paving work as an example of the use of water-coagulated soil. Fig. 11 is a front view of a landslide pavement construction work, Fig. 11 is a perspective view of a flowerbed boundary preparation work as an example of using water-coagulated soil, and Fig. 12 is a front view of a pond construction work as an example of using water-coagulated soil. 1...Construction work site, 2...Earth removal (construction surplus soil)
, 2A... Dry residual soil, 2B... Water coagulable mixed soil, 3... Dryer, 5... Water coagulating soil, 6... Water hole, 8... Sea, A... underwater part, 10... embankment, 11... reclaimed land, 13... slope, 13B... layered part, 14... landslide slope, 14B... concrete 16... flower bed, 17... Boundary, 19... Coating layer,

Claims (3)

[Claims] (1) Construction surplus soil is dried to a moisture content of 13% or less to obtain dry residual soil, and for 1 m^3 of the dry residual soil, 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 7 to 20 kg of a coagulant consisting of a mixture of 25 to 400 kg of Boltland cement are added and mixed, stored in a waterproof bag, sealed, and disposed of as water coagulated soil. (2) Construction surplus soil is dried to a moisture content of 13% or less to obtain dry residual soil, and for 1 m^3 of the dry residual soil, 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 After adding and mixing 7 to 20 kg of a coagulant consisting of a mixture of 2 to 250 to 400 kg of Boltland cement and storing it in a waterproof bag, it was sealed and transported to the dumping site as water-coagulated soil, and water holes were drilled in the waterproof bag. and dumped it,
A construction waste disposal method characterized by watering as needed. (3) Dry the construction surplus soil to a moisture content of 13% or less, and use 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. 7 to 20 kg of a coagulant consisting of the following and 250 to 400 kg of Boltland cement are added and mixed, and the mixture is stored and sealed in a waterproof bag.