JPH0449315A - Effective use of construction surplus soil - Google Patents

Abstract

PURPOSE:To reduce a volume of surplus soil by mixing cement stabilizer into the surplus soil, and forming an artificial ground of granulation stabilized soil granulated in a specific grain size after applying specific pressure to the mixture. CONSTITUTION:A water permeable and strong molding member 2c is addition ally provided to an upper molding 2a and a lower molding 2b of a press device 2. After that, compressive force 3 is applied to objective soil to be treated in the upper molding 2a within a range of 5-2000kg f/cm<2>. Then, granulation is made in the size of approximate 5-100mm to obtain granulation stabilized soil 1'. The granuation stabilized soil 1'... is mixed with one to several kinds of sizes to backfill it directly to a part required for backfilling and to lightly compact it, or to mix the granulation stabilized soil 1'... compounded by one to several kinds of sizes into sandy soil to throw it into a part required for backfilling and to compact it, or to add water to the granulation stabilized soil 1'..., sand and a powdery stabilized mixture to compact it, and it used for reclamation or filling.

Description

[Detailed Description of the Invention] Industrial Application Field This invention is applicable to construction surplus soil (land surplus soil) generated from construction ground excavation work, as well as dredged earth and sand, waste hentonite mud water, waste generated from implementation of rehearsing methods, etc. This invention relates to a method for effectively utilizing construction waste soil, which is carried out as an industrial disposal of large quantities of so-called construction waste soil, such as muddy water and muddy excavated soil with high moisture content and fine particles.

Conventional technology In recent years, construction surplus soil and construction waste soil generated from construction work have been increasing, and the amount of waste that can be received at disposal sites is increasing.
Ii) is becoming more common. It is becoming increasingly difficult to secure new disposal sites, and the problem of construction surplus soil is becoming even more serious. Disposal of clayey soil containing a lot of water is a particular problem.

In the past, paying attention to the problem of construction surplus soil, the Tokyo Metropolitan Sewerage Bureau, for example, has started a project to reuse construction soil (Jl Civil Engineering Co., Ltd., magazine Tunnel and Underground, October 1989 issue, P41~
P49).

In addition, we have conducted research on effective utilization methods by forming soil blocks (P5 to P56 of the November 1981 issue of the magazine "Soil and Foundation J"), and research on soil granulation (JSCE Transactions No. 370/
m-5 June 1986 issue, P95-P]04), and design of soil granulation plants and grounds using granules (P37-P4 of the magazine "Soil and Foundation" December 1989 issue)
2) A variety of research and development efforts are being conducted.

In addition, conventional methods for creating artificial ground include a method of injecting and compacting construction surplus soil or its stabilized soil, or a pre-mixing method (blending method) of pouring stabilized soil of construction surplus soil into backfill areas or formwork. Mix-e method=Special Leap Showa 52
The inventions described in Japanese Patent Laid-open No. 56709 and Japanese Unexamined Patent Publication No. 53-233115 have also been put into practice.

rl! which the present invention seeks to solve! As mentioned above, various solutions have been proposed and research and development is underway to deal with the increasing problem of disposal of construction surplus soil, but no definitive countermeasures have yet been developed.
The reality is that it is not.

In other words, there are issues regarding the ability to process construction surplus soil that is generated in large quantities, the stability of treated stabilized soil, the feasibility of maintaining the environment, and the possibility of effective use of the stabilized soil that is generated in large quantities.
, etc., are still issues that need to be resolved.

Means for Solving rJM As a means for solving the above-mentioned problems, the method for effectively utilizing construction surplus soil according to the present invention is as follows: Construction surplus soil, construction waste ± 2 pieces of cement , mixed with quicklime or other cement-based stabilizers, 5 to 200 kgf/
After pressurizing in the range c+a2, it is granulated to a size of about 5 to 100w1I11, and the granulation stabilization treated soil is used alone.
Alternatively, an artificial ground is formed by filling the soil with a mixture of soil and a stabilizing material or pouring it into a backfilling section, formwork, etc.

The second invention is to mix cement, quicklime, or other cement-based stabilizers into construction surplus soil or construction waste soil, and
After pressurizing in the range of 0 kgf 2, 5~100w+
This is an effective method of utilizing construction surplus soil, which is characterized by granulating it to a size of about 1.5 m and injecting the stabilized granulated soil as a backfilling material for pipe culverts, either directly or together with other fillers.

The third invention is to mix cement, quicklime or other cement-based stabilizers into construction surplus soil or construction waste soil, and
After pressurizing in the range of 8f/cI12 to 0, 5 to 100m
This is an effective method of utilizing construction surplus soil, which is characterized by granulating it to a size of about 1.5 m and using the above-mentioned granulated and stabilized soil as a train material or mat material in the Sun F'F lane construction method.

Working construction surplus soil and construction waste soil are mixed with cement,
It is hardened with a stabilizing material such as limestone, but especially 5 to 200
As a result of pressurizing in the range of kgf/cvn 2, stable treated soil with extremely high strength comparable to that of gravel is obtained, and the weight is significantly reduced (volume reduction). By the way, the influence of the magnitude of the pressing force on the stabilized soil, which is 28 days old and is made by mixing clay with a water content of 69% and cement mass as a percentage of its dry mass, with $30% of ordinary Portland cement added. The results of the investigation are shown in Table 1 below.

Table 1 In short, by pressurizing, stable treated soil with a strength approximately equivalent to that of gravel can be obtained.

The unconfined compressive strength of the stabilized soil after 3 hours of mixing and pressurization (P = 20 to 60 kgf/cm2) was 20 to 30.
kgf/cm2. Strength development is rapid.

In addition, stably treated soil treated with a pressing force P of 20 to 60 kgf/cm2 is 50 to 60% of the volume of construction surplus soil before pressurization.
It was confirmed that the amount decreased to .

In the present invention, the lower limit of the pressurizing force P is 5 kgf/cm.
The reason why it is set as 2 is because the granular stabilized soil can obtain the desired strength even with this level of pressure. Also, set the upper limit to 2
The reason why the pressure was set at 0.00 kgf/cm2 was that considering the limits of the actual working capacity of the processing plant, it was thought that no significant increase in effectiveness could be expected by processing at higher pressures.

The strength of granular stabilized soil depends on the application pressure P.
It is possible to adjust it to be larger or smaller depending on the size of the material, the addition rate of cement, etc., and the age of the material.

In the present invention, the reason why the granules are granulated to a size of approximately 5 to 100 mm is that they are intended to be effectively used as a substitute for gravel. With particle size in this range, backfill material,
This is because it is convenient for handling as train material, mat material, etc. If the particle size is within the above range, when used as backfilling material, embankment material, or train material for pipe culverts, there will be no problem of fluidization or inflow (intrusion) into the interior of pipes through thin cracks in pipes. .

Granulated and stabilized soil granulated to a size of about 5 to 100III11 is stabilized by the H friction (internal friction angle) between particles and does not move, similar to gravel. Particularly in the case of coarse-grained soil on sandstorms, the more diverse the particle sizes, the better the compaction from the point of view of interlocking particles. Therefore, if the stabilized granulated soil has a particle size within the above range, it is sufficient to compact it only slightly, and there is no effect even if it is compacted too much. That is, the artificial ground filled or filled with this granulated and stabilized soil allows light work to be carried out on the ground even immediately after construction. If even a small amount of hardening of other stabilized soils occurs, in addition to the friction between the granular stabilized soils, the gaps between the particles are filled with the hardened material, making it difficult for the particles to move. It provides a solid foundation for most of the work involved.

Example The illustrated invention will now be described in detail.

First, FIGS. 1A and 1B show a process diagram of a method for stably treating construction surplus soil and construction waste soil in which pressurization and granulation are performed in the same process.

In addition, as a pretreatment for the steps shown in Figure 1A and B,
Regarding the soil to be treated (surplus soil from construction), we remove large gravel, plants, shellfish, and other foreign substances, adjust the moisture content or dehydrate, and mix it with cement, quicklime, or other cement-based stabilizers. , kneading, and operations. The amount of stabilizer added is adjusted depending on the use of the granular stabilized soil (especially the required strength). Regarding the adjustment of the water content ratio, when the water content ratio of the soil to be treated is low, water is added so that the water content ratio becomes equal to or higher than the liquid limit. On the other hand, if the water content is high, dehydration should be carried out to the level of the liquid limit or above. The above pretreatment is performed if necessary depending on the actual situation of the soil to be treated.

1A shows a stage in which the soil to be treated, which has been pretreated as described above, is filled into the mold of the press device 2, and FIG. This shows the stage in which pressurization and granulation were performed simultaneously. Press for this! A water-permeable and strong mold member 2c is attached to the upper mold 2a and the lower mold 2b of the apparatus 2. A compressive force 3 is applied to the upper mold 2a, which applies a high pressure of about 200 kgf/cg+2 at maximum to the processing object ±1 within the mold.

As shown in detail in FIG. 2, the upper and lower mold members 2c are made of porous metal or porous stone and have a disc shape with a diameter of about 100 ca, and the inner surface has a pinch of about 5 cm.
Semicircular recesses 2d of approximately cm in size are formed in a continuous dome shape 1, and the recesses 2d of the upper and lower mold members 2c, 2c are vertically symmetrically arranged. Each dent 2
The acute angle part (edge) 2e that is the connecting part of d acts as a blade that divides the pressurized soil 1 to be treated like a so-called wedge, and a crack occurs on the line connecting the upper and lower acute angle parts 2e and 2e, resulting in a structure. It is said to be configured to achieve the purpose of granulation.

Therefore, according to this press device 2, the soil to be treated 1 is compressed and reduced in weight by the forward stroke movement (press) of the upper die 2a, and the granulated stabilized treated soil 1' is rounded with an outer diameter of about 50+un. Approximately 300 pieces are granulated (Fig. 1B)
. At this time, surplus water squeezed out from the processing object ±1 during compression by the bushing device 2 escapes to the surroundings through the water-permeable mold material 2C and is discharged to the outside through the drainage hole 2f of the lower mold 2b. This surplus water may be subjected to neutralization treatment. Both side portions between the upper mold 2a and the lower mold 2b are closed with side plates 2g.

Next, FIGS. 3 to 5 show the steps of a method for stabilizing granulation of construction waste soil, in which the steps of pressurization, granulation, and chamfering are performed in order and in independent steps. FIG. 3 shows a state in which the soil 1 to be treated, which has been pretreated as described above, is filled into the mold of the press device 4. This press device 4 also has a water-permeable and strong mold member 4c made of porous stone or porous metal attached to its upper mold 4a and lower mold 4b. Both side portions between the upper mold 4a and the lower mold 4b are side plates 4d.

It has been rRMed with 4d. This bus device 4 is the upper mold 4
A is operated in the forward stroke, and the soil to be treated can be processed up to 200 k.
It is compressed under a high pressure of about gf/cm2, and is reduced in weight and formed into a square columnar shape, for example, about 100 cm in diameter and about 5 cm in height. At this time, surplus water squeezed out of the soil 1 to be treated during compression escapes to the surroundings through the water-permeable mold material 4C and is discharged to the outside through the drainage hole 4f of the lower mold 4b. This surplus water may also be subjected to neutralization treatment.

FIG. 4 shows the process of placing the stabilized soil 1a compressed and molded as described above on a granulation table 6, and driving the granulation blade 7 with a compression force 8 to granulate it. .

As shown in detail in FIG. 6, the granulating blade 7 has a diameter of, for example, 1.
On the lower surface of the disc-shaped base 7a at position 00c+n, downwardly pointed triangular edges 7b... are formed at a pitch of 5ctn.
It is constructed by attaching a large number of them in a lattice-like or honeycomb-like arrangement. When the granulating blade 7 is driven with a compressive force of 8 against the stabilized soil 1a placed on the granulating table 6, cracks occur at the positions of each edge 7b...
Finally, it is divided at the crack position and subjected to granulation stabilization treatment.
1'... are produced. This granulated stabilized soil 1'...
- is a cube (dice shape) with side length of about 5 cm.

Figure 5 shows the granulation stabilization treatment ±
1' is rolled on a vibrating chamfering mesh 9 installed at a moderately downward slope, and corners are rounded and chamfered to give a rounded shape. This is to prevent the adverse effects of volume changes due to corner chipping after backfilling. In the figure, numeral 11 indicates a vibrator.

In addition, although illustrations and explanations are omitted, for example, the stabilization treatment of pancake-shaped (disc-shaped) compression molded by the method and apparatus shown in Fig. 3 ± 1a is carried out in 1 to 3 steps: crusher It is also possible to carry out a method in which the particle size is adjusted to a suitable size by applying the powder.

A method of effectively utilizing the granulation stabilization treatment ±1'... produced as described above is to fill in the backfilling area around the coast or excavation area surrounded by the retaining wall 12 as shown in Fig. 7A-C. Landfill,
When used to create artificial ground on which heavy machinery can be mounted and operated, buildings such as nuclear reactor buildings 13 as shown in Figure 7 of U.
When creating an artificial ground with the same strength as the surrounding rock by filling in the backfilling area around the When forming the ground, there are also cases where it is used to create an artificial ground using embankment 15 as shown in FIG. 8B. The horizontal lines shown in Figures 7A-D and Figures 8A and H indicate the accumulation of land reclamation in stages. Figure 7C shows the reclaiming of the formed backfilling part-\.
The figure shows a landfill anchored with reinforcing bars or steel plates 16, etc. In either case, a large amount of granulated stabilized soil 1' is used.

By the way, the specific procedure for the above-mentioned reclamation or embankment is as follows: (1) The above-mentioned granulation stabilization treatment ±1'... is used as an offshore mix of 1 to wJ1, and is directly backfilled into the backfilling area and lightly compacted.

Granulated stabilized soil 1' with one to several particle size mixtures is mixed with sandy soil to improve the particle size mixture, and then poured into the backfill area and compacted.

■ Granulated stabilized soil 1'... is mixed with recycled stabilized soil obtained by recycling soil dug up from roads, etc., and backfilled and compacted. Lime-based (quicklime, slaked lime) and cement-based materials are used as stabilizers for recycled stabilized soil.

■ Granulated stabilized soil 1'...and slurry stabilized soil that has not hardened yet (stabilizers such as sand, clay, cement, etc.)
Water mixture) is poured into the backfill area and finished as is or lightly compacted.

■ Structuring Stabilized Treated Soil 1'... Sprinkle a stable mixture of sand and powder, add moisture to this and compact it.

■ Landfill methods that do not compact or are compacted lightly, such as in ■ or ■ above, do not require a compaction process or can be compacted very simply, so they are better than methods that include a compaction process. The construction period required will be shortened. Additionally, construction management becomes easier.

As mentioned in (■) above, sandy soil, clayey soil, or a mixture of the two is mixed with a stabilizer such as cement, and a relatively large amount of water to form a slurry, which is then poured into an artificial ground. The implementation of the premix treatment method (sometimes referred to as the slurry method) in which slurry is created (without compaction) has the following advantages.

I) Traditional slurry methods require several hours or 1130 hours;
In some cases, it was not possible to climb onto the constructed ground until several days had passed, resulting in very poor workability and a long construction period. On the other hand, according to the method of this embodiment,
Basically, since the friction (internal friction angle) between the granulated stabilized soil 1' is used, light work can be done on the created artificial ground even immediately after construction. In addition, if the mixed stabilized soil is hardened even a little, the granulated stabilized soil 1'
In addition to the friction between the particles, the gaps between the particles are filled with the hardened material of the stabilized soil, so that after a few 10 minutes, the artificial ground becomes solid enough to perform most of the construction work.

n) The artificial ground reclaimed by the method of this example is not susceptible to shearing because the strength of the stabilized soil filling the gaps is usually smaller than the strength of the granulation stabilized treatment ±1'... Due to the dilatancy effect of ±1' in the granular stabilization treatment, the maximum strength and strength in the residual state are larger than in the case of only stabilized soil, and under the same conditions, this example is better than the conventional slurry method. It becomes a stronger artificial ground. In addition, it is possible to significantly improve the small residual strength, which has been said to be a drawback of conventional slurry-based improved soils.

■) Conventional artificial ground made using the slurry method involves adding a lot of water, which causes cracks to occur after construction, especially in the surface area, due to drying. However, in the artificial ground produced by the method of this example, the stabilized soil only fills the gaps of ±1' in the granular stabilization treatment (estimated to be 30 to 40% of the total volume); Since shrinkage is prevented by the granular stabilized treated soil 1', there is almost no ritsu due to drying after construction.

Thus, according to the effective utilization method of this example, construction surplus soil,
Cement-based materials are mixed with construction waste soil, which is then pressurized and
Because it is granulated, the volume of construction surplus soil and construction waste soil is significantly reduced, contributing to extending the life of existing disposal sites.

In addition, by using granular stabilization treatment ±1', compared to the conventional pre-mixing treatment method for slurry stabilized soil,
It is possible to create an artificial ground that is easier to work with, shortens the construction period, has improved strength characteristics as a ground, and is highly durable.

Second Embodiment In this embodiment, cement was added to construction surplus soil and construction waste soil in the same manner as explained based on FIGS. 1 to 6 above.
After mixing quicklime or other cementitious materials and pressurizing this to a range of 5 to 200 kgf/cw+2,
Granular stabilized soil 1' granulated to a size of about 5 to 100 m5 is used as a drain material or mat material.

In other words, when constructing a structure or embankment on soft ground, if the soft ground is cohesive, a train material is generally inserted into the ground to promote consolidation of the cohesive soil and shorten the consolidation time. . In addition, in sandy ground where there is a risk of liquefaction during an earthquake, drain materials are installed in the sandy ground in order to quickly dissipate the increase in pore water pressure that occurs during an earthquake and prevent liquefaction. Traditionally, mountain sand and crushed stone have been used as materials for these drains, but due to the recent increase in the amount of construction work, the depletion of mountain sand and crushed stone resources, the environmental destruction of the extraction area due to the extraction of mountain sand and crushed stone, and the problems caused by transportation vehicles ( Due to reasons such as deterioration of the roadside environment (dump pollution) caused by the passage of dump trucks, it is becoming difficult to use mountain sand and crushed stone as the above-mentioned train materials.

Therefore, in this embodiment, the above-mentioned granular stabilized soil 1' of construction surplus soil and construction waste soil is used as a train material and a mat material in place of conventional sand, gravel, and crushed stone.

Specifically, as shown in FIG. 9A, it is used as a Santorene material 16 and a mat material 17 in the Santorene method. 18 in the figure is a net. In this case, Santorene material 16
No compaction will be carried out.

■ As shown in Figure 9B, it is used as the bagging train material 19 and U mat material 17 of the bagging sand drain method.

■ Used as train material 2o and mat material 17 in the sand compaction pile construction method on cohesive soil as shown in Fig. 9C. Alternatively, it can be used as train material and mat material in crushed stone conopaction pile construction method. In this case, vibration is applied to compact the train material.

■ It is used as the train material 21 and U mat material 17 of the Grachel train method as in No. 91mD.

The train material 21 is for dissipating pore water pressure.

■ As shown in the 9th diagram, it is used as a replenishment material 22 for the lot conversion method or as a replenishment material for the vibroflotation method. In the figure, 23 indicates the vibrofoot at the tip of the a-toe.

When the granular stabilized soil 1' is used as a drain material/mat material by the method of this example, compared to conventional materials, firstly, it does not contain any fine particles that impair water permeability; Second, it has the feature that it is possible to obtain granular stabilized treated soil 1' having a particle size required depending on the intended use. In addition, construction surplus soil and construction waste soil, which are unnecessary and difficult to dispose of, can be effectively used as mold as an alternative to sand and gravel.

Conversely, the protection of sand and crushed stone resources will be achieved, and the environment of the sand and crushed stone extraction area will be protected. Furthermore, the roadside environment where vehicles (dump trucks) transporting sand and crushed stone pass is protected from dump truck pollution.

Third Embodiment In this embodiment as well, cement was added to construction surplus soil and construction waste soil in the same manner as explained based on FIGS. 1 to 6 above.
After mixing quicklime or other cementitious materials and pressurizing this at 5 to 200 kgf/cm2 (D range,
Granular stabilized treated soil 1' granulated to about 5 to 1 am is used as backfilling material for pipes.

In other words, when it comes to water and sewage work, waste work, and electrical work, it has been common practice to lay pipes and compact the sand when backfilling the pipes. However, especially in water and sewage systems, the upper needles containing sand were sometimes washed out due to water leakage from damaged pipes and people, causing the upper paved portions to cave in. In addition, pipe construction is often carried out at night, and compaction work poses problems as noise and vibration pollution.Therefore, in this example, the above-mentioned granular stabilization treatment of construction surplus soil and construction waste soil was carried out by ±1'. Used as an alternative to conventional backfill materials.

The specific usage can be broadly classified as follows: A) The gap between granular stabilized soil 1' and 1' is not filled with anything.

B) Fill the gap between granular stabilized soil 1' and 1' with other filler.

There is a construction method called. To explain this concretely with the illustrated example, first, as a construction method belonging to the above a), as shown in Figure 10A and B, the surrounding area of the groove to be constructed is It is covered with a fine net 27, and the granular stabilized soil 1' is backfilled therein.

■ As shown in Figure 11, granular stabilized soil 1' consisting of several different particle sizes is backfilled as is and compacted slightly.

FIG. 10A shows an example using backfill material with a single grain size. In Figure 10B, three stages of nets 27, 28° 29 are installed from the deepest part of the groove to the shallower layer, with large grains in the deepest part and medium grains in the middle depth. The figure shows a structure in which particles with the smallest particle size are backfilled in the upper layer in order. Both methods are net 27.
28. 29 prevents soil particles from the surroundings from entering the gaps of the granular stabilized soil 1' and settling. 25 in FIG. 10A indicates a roadbed consisting of a pavement 25a, a gravel layer 25b, and a sand layer 25c.

Next, as a construction method belonging to the above B), as shown in Fig. 12A, the granular stabilized soil 1' is backfilled with super absorbent polymer gel 30 as a space filler, and then it expands by water absorption. The super absorbent polymer gel 30 fills the gaps in the granular stabilized soil 1'.

■ As shown in Figure 12B, backfill the granular stabilized soil 1' with the stabilized treated soil 1' which has been turned into a slurry (for example, a mixture of sand, clay, cement, and water).

(2) As shown in FIG. 12C, the granular stabilization treatment ±1' is backfilled with recycled stabilization treated soil 32 using quicklime as a stabilizing material.

Incidentally, in the past, a method of pouring stabilized soil into a slurry around pipes was also carried out, but in this conventional method, a lot of water was added for the purpose of slurrying, so it was not possible to backfill or partially fill in the soil as a lump. Only a fraction of the excavated soil can be used.

Moreover, because the settling or breathing is large, the amount of breathing differs between the area above and around the culvert, which causes cracks in the backfilled ground, and it is impossible to work inside the excavated trench while pouring stabilized soil. There were some problems that were close to possible. On the other hand, according to the above method of this embodiment, since the granular stabilized soil 1' having one to several particle sizes equivalent to gravel is used,
The backfilling ground may be constructed without compaction or with only slight compaction. In other words, in the case of granular soil with a single particle size, the arrangement of particles is fixed, so there is no need for compaction (as can be seen by assuming the state of filling of pachinko balls).

In short, according to the method of this embodiment, construction surplus soil/construction waste soil is used as backfilling material, so not only does it not need to be disposed of, but it also eliminates the need for compaction as a construction method. It can significantly shorten the time and lead to lower construction star prices. In addition, quality control is easy, and maintenance problems after construction are less likely to occur. Moreover, the granular stabilized soil 1' can be used as is (recycled) any number of times, it is easy to handle, and it is easy to obtain a stock. Furthermore, since there is little or no noise and vibration due to compaction, it has the effect of reducing pollution problems caused by night-time construction.

Effects of the present invention According to the method for effectively utilizing construction surplus soil according to the present invention, the scope of use of construction surplus soil and construction waste soil is greatly expanded, and there is no need for disposal, thereby extending the life of existing disposal sites. can be achieved. Since it contributes to the creation of effective space as an artificial material for embankments and artificial ground, it can be used as an alternative material to existing sand and crushed stone to protect natural material resources, and it also greatly contributes to environmental protection and prevention of dump truck pollution. be.

[Brief explanation of the drawing]

Figure 1 A and B are ll! A sectional view showing the process of the first embodiment for stabilizing granulation of construction surplus soil, FIG. 2 is an enlarged detailed view of the mold part, and FIGS. 3 to 5 show the process of stabilizing granulation of construction surplus soil. Fig. 6 is an enlarged view showing details of the granulation blade, Fig. 7 A-D is an explanatory diagram of reclamation of granulation stabilized soil, and Fig. 8 A and B are the same. Explanatory diagram of the creation of artificial ground using grain-stabilized soil, Figures 9A-F
No. 101 is a cross-sectional view showing how the stabilized granulated soil is used as a drain material and mat material in the consolidation ground improvement method. IA, B, FIG. 11, and FIG. 12 AC are cross-sectional views showing a mode in which the granulated and stabilized soil is used as backfilling material for a pipe conduit. 1...Treatment target ± 1'...Pelletization stabilization treatment Figure Figure Figure Figure A Figure A Figure C Figure 8 Figure B Figure D Figure Figure Figure A Figure 10 Figure B Figure III+ 2121A Figure 8-12C

Claims (1)

[Scope of Claims] [1] Construction surplus soil, construction waste soil mixed with cement, quicklime or other cement-based stabilizer, 5 to 200 kgf
/ cm^2, then granulated to a size of about 5 to 100 mm, and the above-mentioned granulated stabilized soil alone or a mixture of soil and stabilizing material mixed therein can be used for embankment. A method of effectively utilizing construction surplus soil, which is characterized by forming an artificial ground by pouring it into backfill areas, formwork, etc. [2] Mix construction surplus soil, construction waste soil with cement, quicklime, or other cement-based stabilizing materials, and add 5 to 200 kgf
After applying pressure in the range of /cm^2, granulate it to a size of about 5 to 100 mm, and use the above-mentioned granulation stabilization treatment as a backfilling material for pipe culverts, either directly or together with other fillers. Features: Effective use of construction surplus soil. [3] Mix construction surplus soil, construction waste soil with cement, quicklime, or other cement-based stabilizing materials, and add 5 to 200 kgf
After applying pressure in the range of /cm^2, the soil is granulated to a size of about 5 to 100 mm, and the stabilized granulated soil is used as a drain material or mat material in the sand drain method etc. Effective use of construction surplus soil.