JPS6363816A - Improving work of surface soil of ground for building - Google Patents

Abstract

PURPOSE:To reduce the cost of construction work by improving only the ground where foundation is formed. CONSTITUTION:The ground where foundation is to be formed is excavated to an adequate depth, and the excavated soil 9 is mixed with a solidifying agent 11 with stirring and temporarily compacted for level regulation. The soil is then completely compacted to form the ground for building. The amount of solidifying agent to be used can thus be reduced and the construction period can also be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a building topsoil improvement method for preventing uneven settlement of lightweight buildings or destruction of concrete foundations due to soft ground.

(Prior art) When constructing a building such as a house on soft ground, the ground is improved in advance by adding a solidifying material to the soft ground, etc.
This prevented uneven settlement of lightweight buildings or destruction of concrete foundations due to soft ground. Conventionally, ground improvement has been carried out over the entire site on which a building is to be built.

(Problem to be Solved by the Invention) However, in order to prevent uneven settlement of lightweight buildings or destruction of concrete foundations, the strength of the ground is required only where the foundation is placed; Large-scale ground improvement such as adding solidification material is not necessarily necessary. Therefore, if the ground is improved over the entire area of the site as in the past, there is a problem in that it requires a large amount of materials such as solidifying materials, and the construction cost increases due to the long construction time.

(Means for Solving Problems) The method for improving ground and topsoil for buildings of the present invention involves excavating only the area where the foundation is to be laid to an appropriate depth in the existing ground for the purpose of improvement, and then using the excavated trench. After spreading the solidification material on the excavated soil and stirring both, preliminary compaction is performed to adjust the level between the mixed soil in which the excavated soil and solidification material have been stirred and the current ground, and then the main compaction is carried out. By doing so, the ground for construction is constructed.

(Operation) To improve only the part of the current ground where the foundation will be placed for the purpose of improvement, and to make it possible to construct houses and other buildings on this ground.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 to 8 show the process of improving the ground for buildings, and the same parts in the figures are given the same reference numerals.

First, as shown in Figure 1, the area where the foundation will be laid is clearly marked on the current ground 1 using ground ropes, white lines 2, etc. This clearly defined area will be the improved area 3 where the current ground 1 will be improved. Further, it is preferable that the improved width 3a of the improved portion 3 is set to be wider than the width of the foundation. The reference numeral 5 in the figure is a construction, and this construction 5 is provided at a distance from the position where the building is to be constructed, taking into account the improvement width 3a and the like. This method 5 is the improved part 30 base bottom 7
When a concrete foundation is formed on top of the concrete foundation, it is used to align the center of the concrete foundation and to span the water system.

Next, as shown in FIGS. 2 and 3, the improved part 3 is excavated by an excavator 6 to the depth at which the foundation is to be provided, the so-called base bottom 7. Thereafter, the level is measured using a level measuring tool 8 or the like to confirm the excavation depth. Reference numeral 9 in the figure indicates excavated soil piled on the current ground 1 by the excavator 6.

Furthermore, the base bottom 7 is excavated by the excavator 6 while maintaining the improved width 3a. The depth excavated here is the improved thickness 3b. After confirming this improved thickness 3b using a level measuring tool 8 or the like, the excavated excavated soil 9 is filled into the excavated soil 10 to a height approximately equal to the height of the base bottom 7, and a ground stabilizing agent and cement are added to the excavated excavated soil 9. (See Figure 4).

After thoroughly mixing and stirring the excavated soil 10 and the solidifying material 11, the mixed soil 12 thus stirred is temporarily compacted by, for example, the excavator 6a of the excavator 6 (see FIG. 5). ), when mixing and stirring the excavated soil 10 and the solidification material 11, an appropriate amount of water is sprinkled as necessary.

After the preliminary compaction is completed, the level between the mixture ±12 and the current ground level 1 is measured, and areas where there is a large level difference or where there is uneven mixing are corrected by the operator (see Figure 6).

Further, this mixed soil 12 is subjected to main compaction using a run 713, rollers 14, etc. (see FIGS. 7 and 8).

After compaction is completed, recheck the level and adjust the water content ratio by spraying water. The solidifying material 11 is 100kg/spraying of this water.
It is not necessary if m or more are mixed.

After a suitable curing period, the ground improvement is completed.

The foundation will be laid on the ground that has been improved as described above.

(Effects of the invention) As described above, according to the ground and topsoil improvement method for buildings of the present invention, the ground is improved only where the foundation will be placed, so the amount of materials used such as assimilated materials can be reduced compared to the conventional method. At the same time, construction time can be shortened and construction costs can be reduced.

[Brief explanation of the drawing]

FIGS. 1 to 8 are process charts showing the ground surface soil improvement method for buildings according to the present invention.

Claims (1)

[Claims] 1) In the current ground for the purpose of improvement, excavate to an appropriate depth only where the foundation will be laid, sprinkle solidification material on the excavated excavated soil, stir both, and then perform temporary compaction. A ground surface soil improvement for a building, characterized in that, after adjusting the level of the mixed soil in which excavated soil and a solidification material are stirred and the current ground, the ground for construction is formed by performing main compaction. Construction method.