JPS5814896B2 - Ground surface soil improvement method for buildings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for improving the ground and topsoil of a building for the purpose of preventing uneven settlement of lightweight buildings or destruction of concrete foundations due to weak ground.

When constructing a building such as a house on soft ground, ground countermeasures have traditionally been taken using flat foundations, pile foundations, etc.

However, the pile foundation causes environmental pollution problems due to noise and vibration during driving, and has the disadvantage that the construction cost is considerably higher than the total building cost, making it an uneconomic construction method.

In addition, although bed foundations are effective on sandy ground and have the advantage of reducing ground pressure on viscous ground, they have the drawback of being extremely expensive and uneconomical.

Moreover, in the case of a bed foundation, it is not expected to be as effective as a cloth foundation using split stones, which costs about half as much.

In view of these circumstances and problems, the present invention has created a construction method that can economically perform horizontal ground improvement with multiple layers and no height differences without causing noise or vibration problems. The ground pressure is reduced, the load is evenly distributed on the soft layer, preventing uneven settlement, and the bearing capacity is also increased.

The construction method of the present invention will be explained in detail below based on embodiments shown in the drawings.

To explain the invented construction method shown in Figure 1, Fujibeton (trade name of Keio Kaken Kogyo Co., Ltd.) or Asano Clean Set 1140 (
For example, apply a soil stabilizing agent such as Nippon Cement Co., Ltd. (trade name) to approximately 1,000 ml for a working area of 72 m (all working areas shown in the drawings below are 72 m').
kg, uniformly dispersed, excavated to a depth of approximately 150 mm using a base cutter (using a backhoe, etc. if necessary), stirred thoroughly, adjusted the water content ratio, and temporarily compacted using a vibro roller. After this, the level is adjusted uniformly to the inside and outside with a level error of 10m71L, and the first layer A is constructed by performing main rolling over the entire surface.

Spread 10 m3 of mountain sand to a uniform thickness on top of the first layer A constructed in this way, spread about 47 bags of cement evenly on top of this mountain sand, and use a base cutter etc. to cut the depth of the cutting edge into the first layer.
Stirring was carried out to the extent that Layer A was not excavated, and after adjusting the water content ratio, preliminary rolling was performed using a vibro roller to adjust the level in the same way as in the first layer, and main rolling was performed over the entire surface, resulting in approximately 150 mm. Apply a thick second layer B.

Further spread 10 m3 of mountain sand to a uniform thickness on top of the second layer B, and apply about 960 kg of the ground stabilization treatment agent on top of this mountain sand.
Spread it evenly, stir it with a base cutter etc. so that the depth of the cutting edge does not excavate the second layer B, adjust the moisture content and temporarily roll it with a vibro roller to adjust the level, and then cover the entire surface. By carrying out the main compaction, a third layer approximately 150 mm thick is constructed.

It is desirable to allow a curing period of 2 days after constructing the first layer, 3 days after constructing the second layer, and 2 days after constructing the third layer, but from the first layer to the third layer without these curing periods. It is also possible to carry out the improvement work all at once in about three days, and then allow a curing period of about two to three days after completion.

An ordinary foundation 3 is laid on the ground 2 which has been improved into a layered structure in this way.

In the figure, 4 is the rising of the foundation, and 5 is the footing.

In the present invention, a ground stabilizing agent is used in the first and third layers, and cement is used in the second layer. Of course it's a good thing.

To explain the invented construction method shown in Fig. 2, the mountain sand 1077I. ′ is spread to a uniform thickness, approximately 960 kg of the above-mentioned soil stabilization treatment agent is evenly spread on top of this mountain sand, and the depth of the cutting edge is adjusted to the current ground level 6 using a base cutter, etc.
After stirring to the extent that it does not excavate, adjusting the water content ratio and adjusting the level by preliminary rolling with a vibro roller, etc., we perform main rolling over the entire surface.
Construct the first layer D of Ryuatsu.

On top of the first layer D constructed in this way, 10 m3 of mountain sand is further spread to a uniform thickness, approximately 960 kg of the above-mentioned ground stabilization treatment agent is evenly spread on the mountain sand, and a base cutter or the like is used to cut the depth of the cutting edge. Stir to the extent that the first layer D is not excavated,
After adjusting the water content ratio, preliminary rolling is performed using a vibro roller or the like to adjust the level, and then main rolling is carried out over the entire surface to form the second layer E with a thickness of about 150 mm.

In the present invention, a ground stabilizing treatment agent is used for both the first layer and the second layer, but it goes without saying that cement may be used for either or both of them to stabilize the ground.

The curing period may be approximately 1 to 2 days after constructing the first and second layers.

By laying the ordinary foundation 7 on the laminated improved ground constructed in this way, it becomes a foundation for a building such as a house.

In addition, in the inventions having the laminated cross sections shown in Figures 1 and 2, ground improvement is carried out by embanking on the current ground, but as shown in the cross section shown in Figure 3, the top level improvement is Of course, the ground may be improved in a layered manner so that the ground layer is approximately flush with the ground level.

Further, the thickness of each layer and the amount of soil stabilizing treatment agent, cement, etc. to be sprayed are appropriately set depending on the softness and water content of the ground.

In the figure, 8 is the embankment area, 9 is the site, and 10 is the ground improvement area within the site.

The present invention as described above can bring about the following effects.

(b) Since the construction can be carried out using only a simple base cutter and vibro roller, there is no noise or vibration pollution, and construction can be carried out quickly and with peace of mind.

Therefore, the vibrations caused cracks in the wall of the neighbor's house.
There will never be a situation where you have to compensate for multiple dogs. Because the level is adjusted for each layer, the surface of the improved ground is extremely horizontal, making it easy and stable to lay the foundation. , split stone is also unnecessary.

(／→ Because it is made of a laminated structure, it reduces ground pressure, distributes the load evenly on the soft layer, prevents uneven settlement, and increases the supporting capacity.

(d) Since a ground stabilizing treatment agent, cement, etc. are used, it is inexpensive and the ground is uniformly and reliably hardened and stabilized.

(e) It is more economical than any conventional foundation construction method.

As described above, the construction method of the present invention exhibits extremely excellent effects mainly as a soil improvement construction method for lightweight buildings.

[Brief explanation of drawings]

The drawings show examples of the present invention, and Figures 1 to 3 are cross-sectional views of improved ground constructed using the method of the present invention;
Figure 4 is a plan view of the same. 1, 6...Current ground, A...1st layer,
B...Second layer, C...Third layer, D...
...First layer, E...Second layer.

Claims (1)

[Scope of Claims] 1. An appropriate amount of a ground stabilizing treatment agent is uniformly sprinkled on the existing ground 1 for the purpose of improvement, and the soil is excavated to an appropriate depth using a base cutter, etc., and stirred to adjust the water content ratio. After adjusting the level by preliminary rolling with a vibro roller etc., the first layer A is constructed by applying real rolling over the entire surface, and an appropriate amount of mountain sand is spread on the first layer A to a uniform thickness. Spread it out, spread an appropriate amount of cement evenly on top of this mountain sand, stir it with a base cutter etc. so that the depth of the cutting edge does not excavate the first layer A, adjust the water content ratio, and then temporarily sprinkle it with a vibro roller etc. The second layer B is constructed by performing compaction to adjust the level and perform main compaction over the entire surface.A suitable amount of mountain sand is further spread on top of this second layer B to a uniform thickness, and this mountain sand is Spread the ground stabilization treatment agent uniformly on the sand, and use a base cutter etc. to cut the depth of the cutting edge into the second layer B.
After stirring to the extent that it does not excavate, adjusting the water content ratio and adjusting the level by preliminary rolling with a vibro roller, etc., we perform main rolling over the entire surface and construct the third layer C to form a laminated structure. A building ground surface soil improvement method characterized by comprising a building ground. 2 Spread an appropriate amount of cement uniformly on the current ground 1 that is to be improved, excavate it to an appropriate depth using a base cutter, stir it, adjust the water content ratio, and perform temporary compaction using a vibro roller, etc. After adjusting the level, the first layer A is constructed by performing main rolling over the entire surface.
Spread an appropriate amount of mountain sand to a uniform thickness on top of the first layer A, spread an appropriate amount of ground stabilization treatment agent evenly on top of the mountain sand, and use a base cutter etc. to cut the depth of the cutting edge into the first layer A. After stirring to an extent that does not excavate the soil and adjusting the water content ratio, the second layer B is constructed by performing preliminary rolling with a vibro roller, etc., adjusting the level, and performing main rolling over the entire surface. Spread an appropriate amount of mountain sand to a uniform thickness on top of the second layer B, spread cement evenly on top of the mountain sand, and use a base cutter etc. to set the depth of the cutting edge to such an extent that it will not excavate the second layer B. After stirring, adjusting the water content ratio, and adjusting the level by preliminary compaction using a vibro roller, etc., we perform main compaction over the entire surface and construct the third layer C, thereby creating a laminated building ground. A ground surface soil improvement method for buildings according to claim 1, comprising: 3 Spread an appropriate amount of mountain sand to a uniform thickness on the current ground 6 that is to be improved, spread an appropriate amount of ground stabilization treatment agent evenly over this mountain sand, and use a base cutter etc. to cut the depth of the cutting edge. After stirring to the extent that the current ground 6 is not excavated, adjusting the water content ratio and adjusting the level by preliminary rolling with a vibro roller, the first layer D is constructed by performing main rolling over the entire surface, Further spread an appropriate amount of mountain sand to a uniform thickness on top of this first layer D, spread an appropriate amount of the ground stabilization treatment agent uniformly on top of this mountain sand, and use a base cutter etc. to cut the depth of the cutting edge. Stir to the extent that the first layer D is not excavated,
After adjusting the water content ratio and adjusting the level by preliminary compaction using a vibro roller, etc., the second layer E is constructed by carrying out main compaction over the entire surface to form a laminated building ground. A ground surface soil improvement method for buildings that is characterized by: 4 Spread an appropriate amount of mountain sand to a uniform thickness on the current ground 6 that is to be improved, spread an appropriate amount of cement evenly on top of this mountain sand, and use a base cutter etc. to cut the depth of the cutting edge to the current ground 6. After stirring to the extent that it does not excavate, adjusting the water content ratio and adjusting the level by preliminary rolling with a vibro roller, the first rounding is carried out over the entire surface.
Layer D is constructed, and on top of this first layer D, an appropriate amount of mountain sand is further spread to a uniform thickness, and an appropriate amount of ground stabilization treatment agent is uniformly sprinkled on top of this mountain sand. The depth of the cutting edge is stirred to the extent that it does not excavate the first layer D, the moisture content is adjusted, and the level is adjusted by preliminary rolling with a vibro roller, etc., and then the second layer is formed by performing main rolling over the entire surface. 4. The building ground surface soil improvement method according to claim 3, wherein a laminated building ground is constructed by constructing E. 5 Spread an appropriate amount of mountain sand to a uniform thickness on the current ground 6 that is to be improved, spread an appropriate amount of ground stabilization treatment agent evenly over the mountain sand, and use a base cutter etc. to cut the depth of the cutting edge. After stirring to the extent that the current ground 6 is not excavated, adjusting the water content ratio and adjusting the level by preliminary rolling with a vibro roller, the first layer D is constructed by performing main rolling over the entire surface, Further spread an appropriate amount of mountain sand to a uniform thickness on top of this first layer D, spread an appropriate amount of cement evenly on top of this mountain sand, and use a base cutter or the like to cut the depth of the cutting edge to match the first layer D. After stirring to the extent that no excavation occurs, adjusting the water content ratio, and adjusting the level by preliminary rolling with a vibro roller, etc., the second layer E is constructed by carrying out main rolling over the entire surface, resulting in a laminated building. The building ground surface soil improvement method according to claim 3, which constitutes the ground. 6 Spread an appropriate amount of mountain sand to a uniform thickness on the current ground 6 that is to be improved, spread an appropriate amount of cement evenly on top of this mountain sand, and use a base cutter etc. to cut the depth of the cutting edge to the current ground 6. After stirring to the extent that it does not excavate, adjusting the water content ratio and adjusting the level by preliminary rolling with a vibro roller, the first rounding is carried out over the entire surface.
Apply layer D, spread an appropriate amount of mountain sand to a uniform thickness on top of this first layer D, spread an appropriate amount of cement evenly on top of this mountain sand, and use a base cutter etc. to cut the depth of the cutting edge. Saga 1st
After stirring the layer D to the extent that it does not excavate, adjusting the water content ratio and temporarily rolling it with a vibro roller etc. to adjust the level,
The method for improving the topsoil of a building ground according to claim 3, wherein a layered building ground is constructed by constructing the second layer E by carrying out main rolling over the entire surface.