Get to know the relationship between soil suitable for building

Home – Garden & Home Improvement | Chanell Reshid | 30 views

Large cities such as Tokyo, Osaka, Nagoya stands proudly on the soft ground, called the Holocene alluvial.

Defective housing problems many people now worry. Is built, without proper soil unsuitable for many of defective houses build houses on soft ground, such as improved case. Basic was the ground-there is. This is good ground and would want to would try about the shape of the suit I know of poor soil and soil Foundation. Promote the General apartment story in mind. In order to take a closer look as follows:

Types of soil
-How to recognize good soil, bad ground
Type of apartment basic
-Try to check in the model room! Geological Survey map view

Types of soil

Common ground of Japan, is like layer in order from top.

( Black ) / topsoil
Surface soil 1
-sand gravel
-Alluvium alluvial 2
-achievement-diluvial layer 3

1 Surface soil… directly under the building from the ground up to several tens meters ground. Compared with the under ground, much milder. For example,, part of the red soil called Kanto loam deposited volcanic ash of Mt. Fuji in Kanto. By region x x are about the name of loam

2 alluvial alluvium… about n/a years ago made since the relatively new stratum. And generally weak layers and deposited sediments, humus was carried in rivers and other.

3 In older stratum of diluvium achievement… made 2-2 million years solid. A good soil consists of rock and sand gravel and support the foundation of the building.

These strata changed depending on where in the Japan layer thickness, are on a roll. Alluvium is synonymous with the soft ground and thick distributed in the alluvial region weak earthquake, dangerous. When building this alluvium and are widely distributed in major cities such as Tokyo and Osaka extends pile up under that supporting ground, and to support the load of the building. When building a building like this is ground survey check the support layer and determines the shape of the proper basis. Soil strength is evaluated n, N n/a more than a stiff ground and are generally suitable for bearing strata of high rise apartments.

[Figure 1] soil type: alluvial is reclaimed in deposits in the Valley, such as carried from the sea by the old, sea level rose several tens meters now more can, and became plain after the part.

Reference defines types of soil until no. 1-No. 3 species by depth up to support ground in building standards law bulletin, [Figure 1].

System No. 1 seeds ground… configured hard gravel or bedrock and composed by no. 3 Miki earlier strata such
System No. 2 seed ground… first kind with anything except the 3 seed ground
System consist in mulch and mud… No. 3 seed soil alluvial, its depth is roughly 30 m or more. In the reclaimed swamp and burst, such as those not passed 30, depth at 3 over, and landfills.

In the soft ground is if implicated from General sway enough soft ground when an earthquake prone settlement takes a hit the pile until the hard layer of support and appropriate soil improvement, for example. When purchasing a home, to ensure that land has the character better.

Good soil-how to recognize a bad ground

When you build a building and ground survey, firmly investigate is Basic. However, you cannot separately investigated when considering. So here are the simple how to recognize here.

The first way to guess from the name of a place. Koigakubo, Marsh, swamp, ASHI, lagoon, Yaesu, under the suspicious area may have part of the place name give out an odor under was a rivers and the sea is not also in the whole. In easy-to-settlement on soft ground, and a layer of humus soil. Surrounding roads not to collapse, after the settlement, such as cracking any wall and the wall of the House in the neighborhood, check out.

Is also said and susceptible to earthquake part of embankment slope, Oyama Hill, land reclamation. Buildings stand on the cliff are earthquakes greater part of larger earthquakes, jumped some piling on, such as Koyama and Hill. Depressions in the opposite collection of water easier to tend the soil is weak. Cut is good in the reclamation area, seen better soil becomes limp in the parts of the embankment for greater impact of the earthquake, landslide and settlement risk.

Figure 2 example and earthquake greatly affected the land. Depressions, land reclamation embankment parts can be affected by earthquake bigger cliff, on the Hill of the Koyama, is.

So on the next page, introducing the perspective of high rise apartment building Foundation type and soil survey figure.

Foundation of the high-rise condominium type

Fundamental types are determined by soil conditions. If hard ground is relatively near the surface to use “Foundation” use “pile” hard ground cannot put foundations directly deep. Direct friction piles, pile. to the footing and mat Foundation and pile foundation basics [Figure 3] Good because the pull-out force in the high-rise apartment beats up deep pile? Tempting thought is important is and fundamental parts of the building are: on the combined robust. Not problem if of good quality soil mat Foundation.

[Figure 3] basic apartment types: basic apartment types are determined, such as distance to the bearing strata.

Subsidence and settlement of building due to liquefaction and settlement of building with pile and ground support such damage if the pile to the tilt might be if the Foundation directly as a note of the earthquake. It if proper treatment is done, can have a safe performance for the earthquake.

Geotechnical survey map view

See example shows soil survey figure finally in it [Figure 4]. Know this, soil shape figure and that the distance to the support base of the survey point and what kind of soil layers. You can browse the can yourself check the characteristics of the land. Let often attached with construction drawings showing, such as in a model room.

[Figure 4] soil shape figure: more than 20 supporting ground (30 to 50 N value) until this soil shape figure, that can read. In this case, type pile firmly up its support base.

General ground survey is done in 1 parts. Is often because if ground hardness varies even on the same site location and do the survey where 4 corners will located in the building.

Has been seen to high rise condo example about building located in soil. With the basic shape of the building proper soil, soil is important. Is that one of the conditions that can prevent flaws such as distortion, distortion of the building and strong earthquake. Try sure soil shape figure of this perspective in the eyes of your own please referring to the.

[Related article] speaking of structural safety…
This is earthquake-proof structure! Apartment series
Structural calculation of why? Impersonating the three prevention methods

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