JP2002275881A - Natural ground solidifying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a natural ground solidifying method without requiring a necessity of increasing variety of products in response to a season, a necessity of manually adjusting quantity of the catalyst at a construction field, and a necessity of disposing the filling material left as it is not used. SOLUTION: A filling pipe 28 is arranged in an oblong hole 30 drilled in the natural ground 29. The two-liquid mixture type urethane group foaming chemical liquid obtained by mixing a liquid A and a liquid B is supplied to the filling pipe 28, and filled into the natural ground 29 to solidify the natural ground. The liquid A, the liquid B and a diluent liquid C for the catalyst working as a catalyst when mixing the liquid A and the liquid B are separately prepared. When mixing the liquid A, the liquid B and the diluent liquid C for supply, the liquid A, the liquid B and the diluent liquid C are mixed in this side of the filling pipe 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of solidifying a ground.

[0002]

2. Description of the Related Art A ground injection material (urethane-based / silica resin-based) used in a ground-solidification method is a chemical solution injected into the ground for the purpose of ground improvement. 2. Description of the Related Art Conventionally, a two-liquid mixing type foaming chemical is often used. For example, as the two liquids, a combination of the liquid A (main agent): polyol and the liquid B (curing agent): isocyanate can be mentioned.

[0003] Such a liquid A and a liquid B are prepared at a work site or the like in a state of being packed in separate cans (both not shown). At the time of use, first, A liquid, B liquid
The liquids are stored in separate tanks 21 and 22 (tank 2 for liquid A).
1, B liquid tank 22), and then drive the injection gear pump (not shown) of the injection machine 23 to obtain the A liquid and B liquid.
Separate hoses 24 from each tank 21 and 22
a, 24b, 25a, 25b (Hose for liquid A 24a, 2
4b and liquid B hoses 25a and 25b), and are fed into a mixing unit 26 attached to the base end of an injection pipe (injection bolt) 28 via a coupler 27. The mixing unit 26 combines the liquids A and B. And mix. Next, this mixed solution is supplied into the inside from the base end opening of the injection pipe 28 through the coupler 27, and foamed while being stirred by a static mixer (not shown) provided therein (such mixing is performed). , A chemical reaction is initiated by stirring, and foaming is caused by the chemical reaction), and a hole (not shown) formed in the opening at the tip end of the injection pipe 28 or the peripheral wall of the injection pipe 28, and a hole 30 formed in the ground 29. (See FIG. 3).

[0004]

However, the characteristics of the above-mentioned injected material vary depending on the use conditions (outside temperature, chemical solution temperature, presence / absence of water, etc.). For example, it has been found that the reaction rate changes depending on the temperature of the chemical solution, and that the reaction time becomes slower as the temperature of the chemical solution decreases, and the expansion ratio decreases. In addition, regarding the silica resin-based liquid A, separation of the water glass and the catalyst occurs depending on the temperature of the chemical liquid, and there is a possibility that a uniform product cannot be obtained. Therefore, the amount of catalyst on the side of solution A is changed according to the season, and the number of product types is increased to 2-3 (spring / autumn, summer, winter, etc.) so that it can be used across the seasons throughout Japan. The fact is that it is. Also,
Even when the number of varieties is increased in this way, since the temperature varies depending on the region (for example, there is a temperature difference even in a cold region), the amount of catalyst must be manually adjusted at a work site or the like. In addition, since the above-mentioned injection material deteriorates due to long-term storage, the quality assurance period is set to six months after production. Therefore, as described above, when the product type is changed according to the season, the quality assurance period expires and the product cannot be used even if the product of this type is stored until the next season. For this reason, among the remaining injection materials that have not been used, the solution A to which the catalyst has been added is discarded without being stored until the next season.

The present invention has been made in view of such circumstances, and it is not necessary to increase the variety of products according to the season, and to adjust the amount of catalyst manually at a work site or the like. It is another object of the present invention to provide a method of solidifying a ground mountain that does not need to be used and that does not need to be discarded.

[0006]

In order to achieve the above object, the present invention provides an injection pipe in a long hole drilled in the ground, and fills the injection pipe with the solution A and the solution B. 2 obtained by mixing
A ground consolidation method in which a liquid mixture type urethane foaming chemical liquid is supplied and injected into the ground, wherein a catalytic action at the time of mixing the A liquid, the B liquid, and the A liquid and the B liquid is performed. And a diluent C of the catalyst to be prepared are separately prepared.
The first gist is a ground consolidation method in which a liquid A, a liquid B and a diluent C are mixed before the injection pipe when the liquid and the diluent C are mixed and supplied. An injection pipe is provided in a long hole drilled in the container, and a two-part mixed urethane foaming chemical obtained by mixing the liquid A and the liquid B is supplied to the injection pipe so as to be injected into the ground. In this method, a solution A, a solution B, and a catalyst that acts as a catalyst when mixing the solution A and the solution B are separately prepared, and the solution A and the solution A are added to the injection pipe. A second aspect of the present invention is a ground compaction method in which the catalyst is mixed with the solution A immediately before the supply of the mixture with the solution B.

[0007] That is, in the first method of solidifying the ground of the present invention, an injection pipe is provided in a long hole formed in the ground, and the A liquid and the B liquid are mixed in the injection pipe. This is a method of solidifying solid ground in which the obtained two-liquid mixed type urethane foaming chemical liquid is supplied and injected into the ground, and comprises a liquid A, a liquid B, and a catalyst for mixing the liquid A and liquid B. A diluent C of the catalyst that acts is separately prepared, and when the A liquid, the B liquid, and the diluent C are mixed and supplied to the injection pipe, the A liquid and the B liquid are mixed before the injection pipe. The diluent C is mixed. As described above, according to the first ground consolidation method of the present invention, A
The solution A, the solution B, and the diluent C are separately prepared, and the solution A, the solution B, and the diluent C are separately pumped to a position short of the injection tube, and then the solution A is positioned before the injection tube. And B
Since the solution and the diluent C are mixed and supplied to the above-mentioned injection pipe, the solution A, the solution B, and the diluent C are used at a work site or the like according to the season.
Can be freely adjusted. Therefore, it is not necessary to increase the number of product types to two or three types, and it is not necessary to manage the above two or three types of products.
In addition, there is no need to manually adjust the amount of catalyst for the above two or three types of products, and labor costs can be reduced. In addition, since the types of products are not increased according to the season, the remaining A liquid, B liquid and diluent C can be stored until the next season without being used, and there is no need to dispose them.
In addition, since the amount of the catalyst is small, the catalyst can be easily mixed with the solution A and the solution B by diluting the catalyst to make a diluent.

[0008] Further, according to a second solidification method of the present invention, an injection pipe is provided in a long hole formed in the ground, and this injection pipe is provided with:
This is a ground consolidation method in which a two-part mixed urethane foaming chemical obtained by mixing the liquid A and the liquid B is supplied and injected into the ground. The liquid A, the liquid B, and the liquid A The liquid and the catalyst that acts as a catalyst when mixing the liquid B are separately prepared,
When mixing and supplying the solution A and the solution B to the injection tube,
Immediately before the supply, the catalyst is mixed with the liquid A. Thus, in the second ground consolidation method of the present invention,
The solution A, the solution B, and the catalyst are separately prepared at a work site or the like, and the catalyst is mixed with the solution A immediately before the solution A and the solution B are mixed and supplied to the injection pipe. Therefore, the mixing ratio of the solution A and the catalyst can be freely adjusted according to the season at the work site or the like. Therefore, the product type is 2
It is not necessary to increase the number of products to three or more, and it is not necessary to manage the products of the above two or three types. In addition, there is no need to manually adjust the amount of catalyst for the above two or three types of products, and labor costs can be reduced. In addition, since the types of products are not increased according to the season, the solution A, the solution B, and the catalyst remaining without being used can be stored until the next season, and there is no need to discard the solution. In addition, unlike the case where the diluent C of the catalyst is mixed together with the A liquid and the B liquid just before the injection pipe as in the first solidification method of the present invention, the step of preparing the diluent C is unnecessary. Becomes

[0009]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the solidification method of the present invention. In the drawing, reference numeral 1 denotes a catalyst tank, which has a structure capable of storing a diluent C (not shown) obtained by diluting an amine catalyst with water. This catalyst tank 1
Since the amine catalyst smells, it is formed in a closed type. Reference numeral 2 denotes a first connection hose connecting the catalyst tank 1 and the injector 4, and reference numeral 3 denotes a second connection hose connecting the injector 4 and the mixing unit 5. The injector 4 has three independent motors (not shown), and each of the motors separately and independently pumps three kinds of liquids (A liquid, B liquid and diluent C). In addition to the above, the pumping ratio of the above three types of liquids can be freely adjusted. The diluting liquid C is supplied to the mixing unit 5 from the catalyst tank 1 through the first and second connecting hoses 2 and 3, and the diluting liquid C is supplied from the A liquid tank 21 through the A liquid hoses 24a and 24b. Is supplied from the B solution tank 22 through the B solution hoses 25a and 25b.
Liquid is supplied. In the mixing unit 5, the liquid A, the liquid B, and the diluent C are mixed and mixed, and the mixed liquid is sent to the coupler 27. The other parts are the same as those of the conventional example shown in FIG. 3, and the same parts are denoted by the same reference numerals.

In the above configuration, the liquid A, the liquid B, and the diluting liquid C are separately prepared in cans (not shown) at a work site or the like. Then, at the time of use, first, the A liquid, the B liquid and the diluting liquid C are respectively poured into the separate tanks 1, 21 and 22 (that is, the A liquid is supplied to the A liquid tank 21 and the B liquid is supplied to the B liquid tank 22). And the diluent C is poured into the catalyst tank 1). Next, each motor of the injector 4 is driven to separate the solution A, the solution B, and the diluting solution C from the tanks 1, 21 and 22 into separate hoses 2 and 2, respectively.
3, 24a, 24b, 25a, 25b,
The solution A, the solution B, and the diluent C are mixed and mixed by the mixing unit 5, which is fed to a mixing unit 5 attached to the base end of the sample 8 via a coupler 27. Next, this mixed solution is supplied into the inside from the base end opening of the injection pipe 28 via the coupler 27, and is foamed while being stirred by a stationary mixer provided therein. Injection is performed from a perforated hole (not shown) formed in the peripheral wall of 28 into a long hole 30 formed in the ground 29.

As described above, in the above-described embodiment, since the liquid A, the liquid B, and the diluent C are separately pumped to the position before the injection pipe 28 by the injector 4, the liquid A, the liquid B, and the diluent C Can be freely adjusted, whereby it is possible to adapt to use conditions such as all seasons and work sites. Therefore, unlike the conventional example, there is no need to increase the variety of products or to manually adjust the amount of catalyst at a work site or the like. In addition, the solution A, solution B, and diluent C remaining without being used can be stored until the next season. Further, since the required amount of the catalyst is small, the diluted catalyst is diluted with water to obtain the diluent C, so that it can be easily mixed with the A liquid and the B liquid.

FIG. 2 shows another embodiment of the solidification method of the present invention. In this embodiment, the A liquid tank 6 provided with a catalyst addition device and a stirring device (both not shown) is used instead of the A liquid tank 21 in the embodiment shown in FIG. This A liquid tank 6
When the catalyst addition device and the stirring device are driven while the solution A is poured into the inside, the amine catalyst is added to the solution A by the catalyst addition device, and the addition amount is automatically measured and set each time. The amine catalyst can be sufficiently stirred in the solution A by a stirring device. Further, instead of the injector 23, an injector 7 having two independent motors (not shown) is used.
The injector 7 separately and independently pumps two types of liquids (the liquid A and the liquid B to which the catalyst is added) with each motor, and freely adjusts the pressure-feeding ratio of the two types of liquids. Is available. The other parts are the same as those of the conventional example shown in FIG. 3, and the same parts are denoted by the same reference numerals.

In the above configuration, the solution A and the solution B are prepared in a work site or the like in a state of being packed in separate cans (both not shown). And just before use,
The A liquid and the B liquid are respectively poured into separate tanks 6 and 22 (that is, the A liquid is poured into the A liquid tank 6 and the B liquid is poured into the B liquid tank 22). Next, the catalyst addition device and the stirring device provided in the solution A tank 6 are driven to add a desired amount of the amine catalyst to the solution A and sufficiently stirred. Next, by driving both motors of the injector 7, the solution A and the solution B to which the amine catalyst has been added are passed from the respective tanks 6 and 22 through separate hoses 24 a, 24 b, 25 a and 25 b, respectively. The solution is fed to a mixing unit 26 attached to the end via a coupler 27, and the mixing unit 26 combines and mixes the solution A and the solution B to which the amine catalyst has been added. Next, the mixture is supplied into the inside of the injection tube 28 through the coupler 27 through the base end opening thereof, and is foamed while being stirred by a static mixer provided therein. 28
Is injected into a long hole 30 formed in the ground 29 from a perforated hole (not shown) formed in the peripheral wall.

As described above, in the above-described embodiment, the catalyst is added to the solution A immediately before use, and then the solution A and the solution B to which the catalyst has been added are separately supplied by the injector 7 before the injection pipe 28. Since it is pumped up to a pressure, the mixing ratio of the solution A and the solution B to which the catalyst has been added can be freely adjusted, whereby it is possible to adapt to the use conditions such as all seasons and work sites. Therefore, unlike the conventional example, there is no need to increase the variety of products or to manually adjust the amount of catalyst at a work site or the like. In addition, the solution A, solution B, and catalyst remaining without being used can be stored until the next season. Moreover, in this embodiment, a step of diluting the catalyst is not required.

[0016]

As described above, according to the first solidification method of the present invention, the solution A, the solution B, and the diluent C are separately prepared at the work site or the like, and the solution A and the diluent C are separately prepared. After separately pumping the liquid B and the diluent C to the position before the injection tube, the liquid A, the solution B, and the diluent C are mixed and supplied to the injection tube before the injection tube. Therefore, the mixing ratio of the solution A, the solution B, and the diluent C can be freely adjusted according to the season at the work site or the like. Therefore, product varieties are 2-3
There is no need to increase the number of varieties, and it is not necessary to manage the above two or three varieties of products. In addition, there is no need to manually adjust the amount of catalyst for the above two or three types of products, and labor costs can be reduced. Moreover, since the types of products are not increased according to the season, the remaining A liquid, B liquid and diluent C can be stored until the next season without being used, and need not be discarded. In addition, since the amount of the catalyst is small, the catalyst can be easily mixed with the solution A and the solution B by diluting the catalyst to make a diluent.

According to the second solidification method of the present invention, the solution A, the solution B, and the catalyst are separately prepared at a work site or the like, and the solution A and the solution B are supplied to the injection pipe. Since the catalyst is mixed with the solution A immediately before mixing and supplying, the mixing ratio of the solution A and the catalyst can be freely adjusted according to the season at a work site or the like. Therefore, it is not necessary to increase the number of product types to two or three types,
There is no need to manage up to three types of products. In addition, the above 2
There is no need to manually adjust the amount of catalyst for up to three types of products, and labor costs can be reduced. Moreover,
Since the types of products are not increased according to the season, the solution A, the solution B and the catalyst remaining without being used can be stored until the next season, and there is no need to dispose. Moreover, as compared with the case where the diluting solution C of the catalyst is mixed with the solution A and the solution B just before the injection pipe as in the first solidification method of the present invention,
The step of preparing the diluent C becomes unnecessary.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of a ground compaction method according to the present invention.

FIG. 2 is an explanatory view showing another embodiment of the solidification method of the present invention.

FIG. 3 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 28 Injection pipe 29 Ground 30 Long hole

Claims (2)

[Claims] 1. An injection pipe is provided in a long hole formed in the ground, and a liquid A and a liquid B obtained by mixing the liquid A and the liquid B in the injection pipe.
A ground consolidation method in which a liquid mixture type urethane foaming chemical liquid is supplied and injected into the ground, wherein a catalytic action at the time of mixing the A liquid, the B liquid, and the A liquid and the B liquid is performed. And a diluent C of the catalyst to be prepared are separately prepared.
A method for solidifying groundwater, comprising mixing a solution A, a solution B and a diluent C before the injection pipe when mixing and supplying the solution and the diluent C. 2. An injection pipe is provided in a long hole formed in the ground, and the liquid A and the liquid B are mixed in the injection pipe.
A ground consolidation method in which a liquid mixture type urethane foaming chemical liquid is supplied and injected into the ground, wherein a catalytic action at the time of mixing the A liquid, the B liquid, and the A liquid and the B liquid is performed. And the catalysts to be prepared are separately prepared, and when the solution A and the solution B are mixed and supplied to the injection pipe, the catalyst is mixed with the solution A immediately before the supply. Mountain consolidation method.