JPH0569935B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a slope stabilization method for efficiently penetrating a soil solidifying agent into a slope.

[Conventional technology]

For example, in order to prevent cliff collapse in mountainous areas or to stabilize slopes created during construction work, the soil quality and ground conditions at the site are investigated and slopes are designed based on these materials.

If the soil and ground conditions are found to be poor as a result of the above investigation, the slope should be constructed with a gentle slope commensurate with the soil conditions, or if the specified slope cannot be maintained due to various conditions such as land price and site, etc. Reinforcement methods such as retaining walls, slope frames, and concrete spraying are used.

In addition, a method of spraying a soil solidification agent is well known, but the penetration efficiency of the agent into the ground is poor, and a method of injecting the agent into the ground is also less effective in terms of construction costs due to shallow soil cover, so it has not been put to practical use. Not yet.

[Problem to be solved by the invention] By the way, if the slope is built with a gentle slope that matches the soil conditions, a large area will be required for the slope, which will not match the various conditions such as land price and site, and it will be difficult to build a retaining wall or a legal framework. , concrete spraying, and other construction methods all have the problem of long construction periods and high construction costs.

In addition, the method of spraying a soil solidifying agent on the slope is
There is also the problem that slopes cannot be sufficiently stabilized because the chemicals do not easily penetrate into the ground, and most of the sprayed chemicals are washed away, making them ineffective compared to the construction cost.

The object of this invention is to solve the above-mentioned problems by making it possible to efficiently infiltrate the soil solidifying agent into the inside of the slope through simple construction, and to effectively prevent the slope from collapsing. The objective is to provide a slope stabilization method.

[Means to solve the problem]

In order to solve the above problems, the present invention covers a natural slope or a constructed slope with an airtight sheet, inserts a suction pipe into the slope, supplies a ground solidifying agent between the sheet and the slope, and The suction was used to increase the efficiency of solidification agent penetration into the ground.

[Effect]

Cover the slope with an airtight sheet, insert a suction pipe into the slope, supply a ground solidifying agent between the sheet and the slope, and suck it up with the suction pipe to create negative pressure on the part of the slope covered with the sheet. This makes it possible to forcibly infiltrate the solidification agent into the ground, thereby stabilizing the slope.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the slope stabilization method of the present invention covers a natural slope or a slope 1 created by construction with an airtight sheet 2 made of synthetic resin.
On the slope 1 in the area covered by the sheet 2, holes A are bored at predetermined intervals and have a depth according to the soil quality, and a suction pipe 3 is inserted into the hole A through the sheet 2 in an airtight manner. It is inserted in the state.

In addition, between the sheet 2 and the slope 1, there is a porous mat 4 made of synthetic resin that maintains the parts other than the periphery of the sheet 2 in close contact with the ground at a constant interval.
has been installed.

At the top of the slope 1, a vacuum pump 5 and a tank 6 storing a cement-based or water glass-based ground solidifying agent a are installed, and the vacuum pump 5 is connected to each suction pipe 3 by a pipe 7. The tank 6 is connected to an injection nozzle 8 provided on the upper side of the slope of the sheet 2.

Furthermore, in order to recover the solidifying agent a that is about to flow out from the lower side of the slope of the sheet 2, the interior of the lower side of the sheet 2 and the tank 6 are connected through a pipe 9 in a communicating manner.

The suction pipe 3 used in this construction method is a steel pipe with a closed end and a hollow interior, as shown in Figures 3 and 4. is provided with a large number of suction holes 10.

The suction hole 10 provided in the suction pipe 3 is, for example, a round hole as shown in FIG. 3, a long hole as shown in FIG. The outer peripheral surface of the suction tube 3 is covered with a filter material 11 made of synthetic resin.

Note that the suction pipe 3 may have a tapered tip portion so that it can be press-fitted directly into the ground, and the hollow portion within the suction pipe 3 may be filled with filter material.

The slope stabilization method of the present invention has the above-mentioned configuration, and when negative pressure is generated by operating the vacuum pump 5, the inside of the suction pipe 3 inserted into the ground of the slope 1 becomes negative pressure, and moisture in the ground is removed. The air passes through the filter material 11 and is sucked into the suction tube 3 through the suction hole 10.

At this time, since the slope 1 is covered with the airtight sheet 2, there is a negative pressure between the slope 1 and the sheet 2,
The solidifying agent a supplied into the sheet 2 from the tank 6 is forcibly sucked into the ground. Therefore, the solidifying agent a can be efficiently penetrated into the ground. Moreover, since the porous mat 4 is laid between the sheet 2 and the slope 1, the solidifying agent a can be impregnated into the mat 4, and the sheet 2 can be impregnated with the solidifying agent a.
The solidifying agent a can be uniformly supplied to the entire slope covered with.

Furthermore, even if the solidifying agent a supplied into the sheet 2 from the upper part of the slope 1 flows down to the lower part of the slope 1, the inside of the lower part of the sheet 2 and the tank 6 are connected in a continuous manner through the pipe 9. Therefore, solidifying agent a is applied to sheet 2.
The solidifying agent a can be collected in the tank 6 without flowing out, and there is no waste in supplying the solidifying agent a.

〔effect〕

As described above, according to the present invention, the slope is covered with an airtight sheet, and with the suction tube inserted into the slope, the solidifying agent is supplied between the sheet and the slope, and the solidifying agent is sucked by the suction tube. Slopes can be stabilized by forcibly penetrating the solidification agent into the ground, making construction easy and short.

Furthermore, since the solidifying agent penetrates efficiently, it does not flow out of the sheet, which has the effect of reducing construction costs.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the construction state of the slope stabilization method of the present invention, Fig. 2 is an enlarged sectional view of the same main part, and Figs. 3 and 4 are partially cutaways showing an embodiment of the suction pipe. It is a front view. 1... Slope, 2... Sheet, 3... Suction pipe, a
...Solidifying agent.

Claims (1)

[Claims] 1. Cover a natural slope or a constructed slope with an airtight sheet, insert a suction pipe into the slope, supply a ground fixing agent between the sheet and the slope, and apply the solidifying agent to the ground by suction from the suction pipe. A slope stabilization method that increases infiltration efficiency.