JP3144321B2 - Fluidization method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluidization treatment method, and more particularly to a fluidization treatment method, which has the same strength and good construction efficiency.
Further, the present invention relates to an economical fluidization treatment method.

[0002]

2. Description of the Related Art In the backfilling work of underground pipes such as water pipes and gas pipes and electric power cables, conventionally, excavated soil is almost completely disposed of and backfilled with mountain sand. However, the filling of piles around the pipes is often inadequate, and as a result, road collapses have occurred, which has been a problem. In recent years, as the securing of soil disposal sites as described above has become more serious, there has been an increasing tendency to reuse excavated soil from the viewpoint of effective use of resources and environmental protection. Chemical treatment methods have come to the spotlight. This method is a method in which water or sewage and a solidifying material are mixed into excavated soil to prepare a fluidized soil, which is then poured into a backfill location and filled. As shown in FIG. 3, the fluidized treated soil construction structure obtained by this method digs an excavation hole or a buried hole 2 in a road 1 and buries an underground pipe such as a water pipe or a gas pipe or a power cable. After arranging 3, the solidified material is mixed with the excavated soil to produce a fluidized treated soil 9, which is poured, and then the roadbed 7 is installed.
The asphalt pavement 8 is applied thereon. As described above, the above-mentioned method enables good filling in a narrow place where compaction is difficult by imparting appropriate fluidity to the fluidized treated soil, and therefore, the filling is insufficient like mountain sand. It is possible to prevent accidents such as sinking without becoming inconvenient, and at the same time it is convenient to reuse excavated soil.

[0003] On the other hand, road occupation work in urban areas with heavy traffic requires the same-day restoration and opening of roads.
As the solidifying material in FIG. 3, a quick-setting solidifying material is used. Since the quick-hardening material hardens in a short time, it is needless to say that at the time of construction, fluidity for ensuring the filling property of the fluidized soil containing the quick-hardening material is necessary.
In order to recover the same day, it is usually necessary to cast a fluidized soil containing this and to cure it in about 30 minutes to 1 hour, and to perform subsequent work such as compaction of the roadbed. When using such a quick-setting solidified material, a method of producing the fluidized treated soil by mixing the quick-setting solidifying material at the backfill site because the setting time is difficult to adjust, etc. It is the present situation that is taken.

[0004]

However, the method of producing and pouring the fluidized soil containing the quick-hardening material as described above at the site is to produce a large amount of fluidized soil at the site. However, there is a problem that the efficiency is low even in view of the location conditions and the work becomes complicated. Further, there is a problem that the quick-setting solidified material is economically disadvantageous in that it is more expensive than a general solidified material. Therefore, the present inventors have conducted various studies on the above-mentioned problems, and found that in the same-day restoration, the strength after construction is comparable and the construction can be performed efficiently and quickly, and is economically inexpensive. The present inventors have found a method of performing a fluidization treatment method by effectively utilizing fluidized treatment soil containing materials, and have accomplished the present invention. Therefore, the problem to be solved by the present invention is to provide a fluidization method which can be performed efficiently and promptly without compromising the strength, and is economically inexpensive.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluidization process in which a fluidized soil obtained by mixing water and a solidifying material in an excavated soil is poured into an excavation hole provided with a buried pipe and filled. In the construction method, the whole of the fluidized treatment soil filling portion is filled with the fluidized treatment soil containing the general solidified material, and then the rapid-hardened solidified material is sprayed and mixed thereon, thereby achieving the fluidization treatment method. Is done. It is also achieved by providing vibration during the mixing.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a fluidization treatment method in which a fluidized treated soil obtained by mixing water and a solidifying material into excavated soil is poured into an excavation hole provided with a buried pipe and filled. This method is characterized by filling the entire part with the fluidized treated soil containing the general solidified material, then spraying and mixing the quick-setting solidified material on the solidified material. The solidified material is rapidly stirred and homogenized,
In addition, since the composition is hardened, construction is easy and the construction time can be reduced. Further, in this method, more than half of the solidified material can be used as a general solidified material, so that a fluidized soil containing the general solidified material can be manufactured and transported at a manufacturing plant or the like. Therefore, at the construction site, it is only necessary to produce the fluidized soil containing the amount of the quick-hardening solidifying material in such an amount that the upper layer is mixed, and it is possible to work very efficiently and obtain a material having the same strength. Further, by using a vibrator or an ultrasonic oscillator together as a means for giving vibration upon stirring, mixing is promoted and a uniform mixture can be obtained.

As the fluidized soil containing the general solidified material used in the present invention, a mixture of the general solidified material and soil is used, and as the fluidized treated soil containing the fast-setting solidified material used in the present invention, A mixture of a quick-setting solidifying material and soil is used. In the present invention, as the soil constituting these,
Mountain sand, sea sand, sandy soil, excavated soil and the like can be mentioned, but it is particularly preferable to use excavated soil. The general solidifying material used in the present invention is not particularly limited, but a conventionally well-known cement-based solidifying agent is preferably used, and cement or blast furnace slag, slaked lime or gypsum is used for cement or cement, for example. The added one is used. On the other hand, as the quick-hardening material, a material having a higher curing speed than a general hardening material is used. For example, a quick-hardening admixture obtained by mixing a calcium aluminate composition with at least one of calcium oxide, calcium carbonate, and calcium sulfate is used. It is manufactured by mixing materials and cement. In particular, a mixture of a super-hardening admixture and cement manufactured by Mitsubishi Materials Corporation, which is referred to by the trade name of Koka Ace, is preferred.

The fluidization method of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a fluidized-processed soil construction structure obtained by the fluidization process of the present invention. Here, in the present invention, the same reference numerals are used for the same components as those given to the components of the structure in FIG. In FIG. 1, a road 1 is excavated to excavate a hole 2
After the buried pipe 3 is installed therein, the fluidized treated soil 4 obtained by mixing the general solidified material into the excavated soil is poured into the solidified material-filled portion of the hole 2 and a dotted line 5 is formed. Is filled up to the point indicated by.
Spray 1 The dispersed hardened solid material 61 and the fluidized treated soil 4 containing the general solidified material are mixed by a means such as stirring to a predetermined thickness.

[0009] The mixing time is a time required for the quick-hardening material to be uniformly mixed and a time required for the hardening of the quick-hardening material to start, but is preferably 5 minutes to 5 minutes in consideration of the stirring area. It is 40 minutes, more preferably 15 minutes to 30 minutes. If the stirring time is less than 5 minutes, a sufficient homogeneous mixture cannot be obtained. On the other hand, when the time exceeds 40 minutes, the hardening of the quick-setting solidifying material proceeds, and stirring becomes difficult. At the time of this mixing, when vibration is given by a vibrator, an ultrasonic oscillator, or the like, the mixing of the solidified material is promoted, and the mixing can be performed sufficiently. By this mixing, a layer of the fluidized soil 62 containing the quick-setting solidifying material is formed in this portion. Further, after the subbase 7 is installed thereon, the asphalt pavement 8 is constructed. By this fluidization treatment method, the fluidized soil 62 is quickly cured, and the roadbed 7 laid thereon can be sufficiently compacted, and can be restored in a short time. Furthermore, in the present invention, the case where the buried pipe is embedded has been described, but this fluidization treatment method is:
It goes without saying that the present invention can also be applied to the case of filling a concave portion such as a large cavity, a hole, or a groove.

[0010]

The present invention will be described below in more detail, but the present invention is not limited thereto.

[Embodiment 1] A fluidization treatment method for constructing a structure having a road cross section as shown in FIG. 1 is performed. In the excavation work, the road 1 was excavated and 1 m
The excavation hole 2 was formed by digging down by cm. Buried pipe 3
After the installation, the excavated hole 2 up to the solidified material filling portion is excavated soil 1310 kg, water 302 kg, solidified material for general soft soil (cement-based solidified material, manufactured by Mitsubishi Materials Corporation) 80 k
g, and the obtained fluidized soil 4 was filled to the position indicated by the reference numeral 5, and a quick-setting solidified material was further placed on top of this.
An amount of 0 kg / cm ³ was sprayed. Then upper part 5
0 cm was stirred and mixed by a bucket equipped with a stirrer.
As a result, after 30 minutes, the upper layer had a uniaxial compressive strength of 0.3.
It exhibited a strength of 6 kgf / cm ² , and the rolling work of the roadbed portion became possible. As a result, an inexpensive material can be used for the lower layer portion, and the upper layer can be rapidly cured, so that the roadbed work can be performed as in the case of using a fluidized soil containing a quick-setting solidifying material, and thus a rapid Restoration work is possible.

Example 2 In Example 1, when stirring and mixing the upper layer portion 50 cm with a bucket equipped with a stirrer, stirring was carried out in the same manner as in Example 1 except that vibration was applied with a vibrator. As a result, the mixing was promoted, and the mixture was quickly homogenized and the curing was promoted. Even when an ultrasonic oscillator was used instead of the vibrator, the same excellent effects of the present invention were obtained, the construction time could be shortened efficiently, and the restoration work could be performed quickly.

[0013]

According to the fluidization treatment method of the present invention, the entire portion of the fluidized treatment soil filling portion is filled with the fluidized treatment soil containing general solidified material, and then the quick-hardened solidified material is sprayed and mixed thereon. Due to this, the quick-hardening material in the upper layer portion is rapidly stirred,
In addition, since the composition is hardened, construction is easy and the construction time can be reduced. Further, in this method, more than half of the solidified material can be used as a general solidified material, so that a fluidized soil containing the general solidified material can be manufactured and transported at a manufacturing plant or the like. Therefore, at the construction site, it is only necessary to produce the fluidized treated soil containing the sprayed amount of the quick-setting solidifying material, so that the work can be performed very efficiently and the strength is comparable. Further, at the time of stirring, by using a vibrator or an ultrasonic oscillator together, the mixing is promoted and a uniform mixture is obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a fluidized soil construction structure obtained by a fluidization method according to the present invention.

FIG. 2 is a cross-sectional view showing a conventional fluidized soil construction structure.

[Explanation of symbols]

 Reference Signs List 1 road 2 excavation hole 3 buried pipe such as gas pipe 4 fluidized treated soil containing general solidified material 5 position indicated by dotted line 61 rapid-hardened solidified material 62 fluidized treated soil containing rapid-hardened solidified material 7 roadbed 8 asphalt pavement 9 Fluidized soil

Continued on the front page (72) Inventor Fumio Kitamura 1-297 Kitabukurocho, Omiya City, Saitama Prefecture Mitsubishi Materials Cement Research Institute Co., Ltd. (72) Inventor Toshihiko Nakamura 1-297 Kitabukurocho, Omiya City, Saitama Prefecture (56) References JP-A-6-344328 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02C 3/04 E02D 3/12 102

Claims (2)

(57) [Claims] In a fluidization treatment method, a fluidized soil obtained by mixing water and a solidifying material into an excavated soil is poured into an excavation hole provided with a buried pipe to fill the excavated soil. A fluidization treatment method characterized by filling the whole with fluidized treated soil containing a general solidified material, and then spraying and mixing a quick-hardened solidified material thereon. 2. The fluidization method according to claim 1, wherein vibration is applied during mixing.