JPS5950812B2 - Liquid isolation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for blocking the flow of liquid such as ground stabilizing chemical liquid.

In recent years, soil stabilizing chemicals have been increasingly used due to their effectiveness, but their effects on the human body have also been studied.

For example, when grouting is to be carried out near an area such as a well that must not be contaminated, it is extremely difficult at the current level of technology to do so with a completely harmless chemical that has the desired strength.

Therefore, this invention was proposed, which attempts to block the flow of liquid with a sheet, thereby preventing situations such as contamination of other areas due to the flow of liquid.

This invention will be explained below with reference to specific examples shown in the drawings.
In this example, when improving a certain ground by injecting a chemical solution, the intention is to block the flow of the chemical solution to other areas. First, guide wall 1 is constructed at the border of the ground that should be blocked, and then the guide wall 1 is created between the grounds. An underground hole 3 is created by excavating with an excavator 2.

Slime 4 accompanying excavation is discharged by a pump 5.

A guide column 7 having a convex engaging piece 6 made of T-beam fixed to the side of a steel pipe is built into the underground hole 3.

Thereafter, this and the concave engagement piece 9 fixed to the side of the seat 8' that has already been installed are used as guide columns, with the convex engagement piece 6 on one side and the concave engagement piece 9 on the other side. A flexible and water-impermeable sheet 8, such as a vinyl chloride sheet, is inserted.

At that time, if a weight 10 is attached to the tip, insertion is easy.

After that, the underground hole 3 is backfilled with high quality excavated soil 11.

Note that the guide pillars 7 are removed at the time of backfilling and are provided for reuse.

The concave engaging piece 9 of the sheet 8 just inserted is used as a guide post when inserting the next sheet.

Here, if the sheet piles are cast as sheets, the construction cost will be high, and it is generally difficult to connect adjacent sheet piles while ensuring water-tightness. Therefore, in this invention, flexible A material that is also water-impermeable is used.

For example, a synthetic citrus sheet, a rubber sheet, a sheet made of cloth subjected to water-impermeable treatment such as rubberization, etc. are used.

Since the sheet is flexible and generally in the form of a roll, it has the advantage of being easy to insert into the underground hole 3, being inexpensive, and easy to handle.

Also, since 8 is flexible when inserting it into the sear 1, if you let both sides fall along the guides as in the example above, you can insert it smoothly with the whole thing evenly stretched. Can be done.

Thus, by blocking a predetermined location with the sheet 8, even if a chemical solution is injected in one area, it can be prevented from flowing into the other area.

For example, if there is a possibility that a chemical solution may flow into a well, etc.
Using this construction method, all you have to do is surround the well with a sheet.

On the other hand, if the injection site is a small area, it is sufficient to surround it with a sheet.

The tensioning depth of the sheet is preferably deeper than the injection depth for safety reasons.

The installation depth, sheet material, strength, etc. are appropriately selected by comprehensively considering factors such as geology, groundwater flow state, and permeation range of the chemical solution.

As described above, according to the present invention, a water-impermeable sheet can be easily and reliably installed in an excavated hole between the ground, chemicals, etc. can be reliably blocked by simple means, and construction is easy. It has the effect of being excellent.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the guide wall, Figure 2 is its plan view, Figure 3 is a vertical cross-sectional view of the underground hole being excavated, Figure 4 is a vertical cross-sectional view of the slime discharge status, and Figure 5 is the underground hole. Figure 6 is a vertical cross-sectional view of the guide pillars installed, Figure 7 is a vertical cross-sectional view of the completed sheet insertion, Figure 8 is a vertical cross-sectional view of the remaining soil backfilled, and Figure 9 is its plan view. be. 1... Guide wall, 2... Excavator, 3... Underground hole, 4... Slime, 5
...Pump, 6...Convex engagement piece, 7.
...Guide pillar, 8, 8' ... Seat, 9
...Concave engagement piece, 10... Weight, 11
...Remaining soil from excavation.

Claims (1)

[Claims] 1. When interrupting the flow of liquid between one ground and another, drill a hole in the ground between the two, install guide pillars in the hole at intervals commensurate with the width of the sheet,
Insert a flexible and water-impermeable sheet into the underground hole with the tip facing downward and engaging the engaging piece provided on the side with the guide column, and use the sheet as a water-blocking screen for liquid. A liquid isolation method characterized by: