JPH0730680B2 - Buried construction method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a burial method, and particularly to a construction method for backfilling earth and sand in a narrow space, or for filling a cavity or void in an abandoned mine with a filler. .

《Prior art》 In backfilling after construction of underground structures, excavated sand and sandy sand are usually used.Embed these sands in a layer of about 30 cm, and use a rammer etc. for each layer. It is compacted by a compaction machine.

On the other hand, when backfilling is performed in a narrow space, a large compaction machine cannot be loaded and installed.Therefore, simply backfill with earth and sand and then pour water to tighten the water. Compaction is also performed using a machine.

In addition, the air mortar method is generally used as a filling method when filling unnecessary cavities and voids such as in abandoned mines.In this method, cement mortar mixed with a foaming agent is used. Inject into a cavity.

However, such conventional backfilling or filling methods have the following problems.

<< Problems to be Solved by the Invention >> That is, in the above-described method of water filling of sand and a method using a vibrator, it takes time to bring in and put in earth and sand in a narrow place, and when water is tightened, water is added to backfilled earth and sand. It takes time to soak and requires a large amount of water.

Further, in the method using the vibrator, since the rod-shaped vibrator is used, the construction efficiency is poor.

Furthermore, in the air mortar method, the material cost is high because cement milk is used, and when the filled air mortar hardens, reaction heat is generated, which may adversely affect the cavities and the periphery of the voids. It was

The present invention has been made in view of the above problems, and an object thereof is to provide an embedding method that is easy to carry in and put in, is inexpensive, and does not adversely affect the surroundings. Especially.

<< Means for Solving Problems >> In order to achieve the above-mentioned object, the present invention is to fill a cavity or void such as a filling material or an abandoned mine used for backfilling after construction of an underground structure. It is characterized in that earth and sand mixed with substantially only air bubbles are used as the filler.

<< Operation >> According to the burial method of the above structure, since only the bubbles are substantially mixed in the burial material or the filler, the fluidity of the burial material and the filling material is increased, and the pumping can be carried out, for example.

Further, since the mixed bubbles intervene so as to fill the gaps between the soil particles, compaction is unnecessary.

<Example> Hereinafter, a preferred example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a burial method according to the present invention.

The burial method shown in the figure is applied to the case where the filling material 12 is filled into the cavity 10 of an abandoned mine that is no longer needed.

The filler 12 used here is a mixture of substantially only air bubbles in the earth and sand, and the filler 12 is the earth and sand supplied from the hopper 16, the air and the foaming agent solution in the stirring tank 14. Are mixed with each other at a predetermined ratio and mixed and stirred at a predetermined ratio, and are supplied under pressure through a pump 20.

As for the mixing ratio of air bubbles and earth and sand, air bubbles of an amount equal to or greater than the porosity of earth and sand are mixed and stirred so that air bubbles are present between particles of earth and sand, thereby increasing the fluidity of earth and sand.

Further, as the foaming agent used for generating bubbles, a protein-based foaming agent, for example, an animal hydrolyzed protein, or a surfactant, for example, a higher alkyl ether sulfate ester salt or lauryl ether sulfate ester of an anionic surfactant is used. Sodium or the like is used, and these foaming agents are dissolved in water and supplied to the bubble generator 18 together with air.

The bubbles created by the bubble generator 18 have a dense particle size and have a cream puff shape.

Now, when the cavity 10 is filled with the filler 12 as described above, the filler 12 is mixed with bubbles exceeding the porosity of the earth and sand,
Because of its high fluidity, pumping is possible even in a narrow space, and loading and unloading of earth and sand can be done easily.

Further, since air bubbles are present between the earth and sand particles of the filler 12 so as to fill the voids, it is not necessary to compact even when this is used for backfilling the underground structure.

Furthermore, since the filler 12 is composed of earth and sand and bubbles generated by firing a foaming agent such as a protein-based substance mixed therein, it does not generate heat of hardening like air mortar and adversely affects the surrounding ground. It does not affect.

In addition, in the above-mentioned embodiment, the case where the cavity 10 is filled with the filling material 12 is illustrated, but the filling material 12 can also be used as a filling material for an underground structure.

<< Effects of the Invention >> As described above, in the burial method according to the present invention, the burial material used for backfilling after the construction of the underground structure or the cavity such as an abandoned pit, the space filled As the filler used is a mixture of sand and sand with only substantially air bubbles, and the air bubbles improve the fluidity of the sand and sand, so construction can be performed easily in tight spaces, and compaction is not required. Construction costs are also low.

Further, unlike the case of air mortar, the heat of curing does not occur, so that the surrounding ground is not adversely affected.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a construction state of an embodiment of the method of the present invention. 10 ... cavity, 12 ... filling material

Claims (1)

[Claims] 1. A filling material used for backfilling after construction of an underground structure or a cavity or a cavity such as an abandoned mine, which is a mixture of earth and sand containing substantially only bubbles. The buried soil construction method.