JP3131316B2 - Construction method of surface soil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a surface soil suitable for a clay-based coat or ground.

[0002]

2. Description of the Related Art Conventionally, the structure of a clay-based coat or ground is composed of a surface treatment layer, a surface layer, a middle layer, a lower layer, and a subgrade from the upper surface side. Cushioning, water permeability, water retention, and durability are provided by this combined structure. Etc. can be obtained.

[0003] The surface material constituting the surface layer is determined by materials available near the site in consideration of the type of ground, the purpose of use, economy, workability, and the like.
In the Kanto region, those of Kanto loam: sand: 50: 50 and Arakita soil: sand: 50: 50 are used.

[0004] Bitter and cosmetic sands are used as a treatment layer material constituting the surface treatment layer.

[0005]

As described above, conditions such as water permeability, water retention and durability are required for clay-based coats and grounds, but in actual grounds,
It is not always satisfied that the above conditions are satisfied, and repairs and repairs have been made.

The major reasons are that the drainage is poor and the surface is apt to be uneven, and that it is easily dried and winds up dust.

[0007] For this reason, in a general rehabilitation work, there is a method in which a surface material constituting a surface layer is dug out, a new material is introduced, and a surface layer and a surface treatment layer are constructed in that order. However, this method is costly and undesirable in terms of cost. In urban areas, there is no place to dump excavated sediment, and it is difficult to treat the discharged sediment.

Accordingly, an object of the present invention is to provide a method of constructing a surface soil excellent in water permeability, water retention and water repellency without generating a large amount of discharged earth and sand.

[0009]

In order to achieve the above object, the present invention provides a method for scraping a surface soil to a predetermined depth, removing pebbles and other gravel, and then adding slaked lime and water repellency to the surface. The ceramic particles and the porous ceramic particles are dispersed and mixed as additives. Next, the mixed surface is compacted and straightened.

[0010]

According to this construction method, only the pebbles such as pebbles are removed, and the discharged earth and sand can be minimized. In addition, water repellency of excess moisture by water repellent ceramic particles,
While the water permeability and dischargeability are improved, the porous ceramic particles ensure a predetermined water retention, so that even if the sunshine continues, it is possible to avoid being in a dry state immediately.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described with reference to the renovation of the current schoolyard soil.

Table 1 shows the properties of the schoolyard soil (hereinafter referred to as "base material") before the renovation.

[0013]

[Table 1] Next, the construction method will be described. The surface layer is raked by a working machine with a ripper, and temporary rectification and rolling are performed by a rolling machine such as a load roller.

Next, using a work machine such as a stone picker,
Primary debris such as ascon mass, concrete waste, brick debris, etc., is dried.

Next, after the roller is temporarily rolled by a rolling machine, masking of the spraying area is performed, and slaked lime is sprayed along the masking.

[0016] Water-repellent ceramic particles which repel water are sprayed thereon. Table 2 shows the conditions using the water-repellent ceramic particles.

[0017]

[Table 2] Next, porous ceramic particles that retain water through a number of holes are sprayed. Table 3 shows the conditions using the porous ceramic particles.

[0018]

[Table 3] Further, after leveling using mountain sand as a replenishing material, slaked lime, water-repellent ceramic particles, and porous ceramic particles are mixed together by a tractor. In addition, the mountain sand used from Table 4 was used from Chiba.

[0019]

[Table 4] In this case, Table 5 shows the mixing ratio of the ground material composed of slaked lime, the water-repellent ceramic particles, the porous ceramic particles, and the supplement material to the base material.

[0020]

[Table 5] Next, after temporary rolling, leveling, and compaction are repeated by a rolling machine, secondary debris is performed by a working machine such as a landscape rake. Subsequently, the final compaction is performed again by the compactor, bitter is sprayed from above, and makeup sand is sprayed to complete the operation.

[0021] After the work is completed, primary, discharge sediment through the secondary dividing gravels pressed to about 1 m ^3/100 m ^2, now requires only emissions by about one-tenth as compared with the conventional construction method.

Table 6 shows the results of the Proctor Needle penetration resistance test for the degree of improvement as a ground material.

In addition, the standard values of the Japan Sports Facilities Association are also shown.

From these test results, it can be seen that they have sufficient supporting force and stability.

Further, the degree of soil improvement was evaluated by a plasticity index. The results are shown in Table-7. From these measured values, it can be seen that mud is hardly formed.

As for dust generation, the height is 50 cm.
A 200 g sample was dropped from above onto a cylindrical container having a diameter of 45 cm, and the amount of floating dust in the container was measured over time using a digital dust meter to determine the relative concentration. The base material of the sample and the improved soil were air-dried once, pulverized sufficiently for the aggregate, and adjusted to approximately 15% with water.
The sample was left in a constant temperature and humidity chamber, and the amount of floating dust was measured every elapsed days. The results are shown in Table-8.

In any state of water content, the amount of floating dust is smaller in the improved soil than in the improved soil.

That is, since excessive water is easily repelled or permeated by the water-repellent ceramic particles and a predetermined water retention can be secured by the porous ceramic particles, the generation amount of dust is suppressed to less than half.

[0029]

[Table 6]

[Table 7]

[Table 8]

[0030]

As described above, according to the method for constructing the surface soil according to the present invention, the amount of sediment discharged can be greatly reduced by removing the gravel such as pebbles from the on-site soil, and the mud can be greatly reduced. Prevents crazing. In addition, water retention is improved, and wind-up of dust can be suppressed for a long period of time.

Continuation of the front page (72) Inventor Mitsuru Nonota 1-6-5 Shimbashi, Minato-ku, Tokyo Japan Road Co., Ltd. (56) References JP-A-3-286003 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E01C 21/00 E01C 23/00 E01C 13/00

Claims (1)

(57) [Claims] After the surface soil is raked to a predetermined depth to remove pebbles such as pebbles, slaked lime, water-repellent ceramic particles and porous ceramic particles are sprayed and mixed on the surface as additives. Next, a method for constructing a surface soil characterized by compacting and adjusting the mixed surface.