JP2003027456A - Method and device for injecting fluid material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for injecting a fluid material, which can solve a problem such that an injection rate decreases with a lapse of time due to occurrence of clogging. SOLUTION: A pressure control means (C) is connected to a pumping pipeline (3) which makes a pumping means (1) communicate with an injection means (2); a prescribed set injection pressure (P0) of the fluid material and a pressure (P1) lower than the pressure (P0) are generated in the pumping pipeline (3); and injection is carried out in such a manner that the injection pressure of the fluid material is taken as a pressure (Pn) lower than the pressure (P0) for an arbitrary duration time (t).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for the purpose of chemical liquid injection work for the purpose of ground improvement, grout work for cracked rocks containing microcracks in rock, or repair and filling of cracks or narrow spaces of concrete structures. TECHNICAL FIELD The present invention relates to a method and a device for injecting a fluid material used for repair work and the like for permeating a liquid or other fluid material.

[0002]

2. Description of the Related Art In the conventional general static pouring method, an appropriate pouring speed is set according to the geological conditions, the pump is not pulsated as much as possible, and the pressure is maintained at a constant pressure. The injection was performed and the injection was continuously performed until a predetermined injection amount or the injection limit was reached. In such an injection method, a large amount is injected only into a portion that is easily injected, and for example, in rock injection, it is difficult to inject into a fine crack portion, and only a large crack is injected to a distance.
Also, the filled portion is likely to be non-uniform. Further, in soil soil, split injection is likely to occur, and the permeability may be small.

Therefore, various dynamic injection methods have recently been proposed (for example, see Japanese Patent Laid-Open No. 2000-27171). These pump the injection material, superimpose a pressure of a fixed cycle on the basic pressure, and improve the injection efficiency by changing the pressure of the injection material.

However, when a pressure fluctuation of a certain period is simply added to the basic pressure as described above, the particles (the gel in the case of injecting a chemical solution, the particle in the case of cement milk, etc.) are present between the soil particles or the microcracks in the bedrock. There is a problem that clogging occurs and the injection amount decreases with the lapse of time.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention provides a chemical solution injection work for ground improvement, a grout work for a cracked rock containing fine cracks in the rock, or a repair or filling of a crack or a narrow portion of a concrete structure. Injecting a fluid material that can solve the problem of clogging and decreasing the injection amount over time in the fluid material injection method used for repair work that penetrates liquids and other fluid materials for the purpose of It is intended to provide a method and apparatus.

[0006]

According to the method for injecting a fluid material of the present invention, an injecting means for injecting a fluid material such as an injecting material by an injecting means and providing it to an injecting object such as a ground or a structure. In a method of injecting a fluid material to be injected from a pressure control means, a pressure control means is connected to a pressure supply pipe line that communicates the pressure delivery means and the injection means, and the pressure control means causes a predetermined set injection pressure of the fluid material and a predetermined set injection thereof. A pressure lower than the pressure is generated in the pressure feeding pipe line, and the injection pressure of the fluid material is injected at an arbitrary duration for a time lower than the predetermined set injection pressure.

Further, according to the method for injecting a fluid material of the present invention, the fluid material is injected at an injection pressure lower than a predetermined set injection pressure in any repeating cycle.

The pressure lower than the predetermined set injection pressure is lower than the resistance pressure acting on the injection material such as earth pressure or water pressure around the injection means in the injection target.

A surge pressure absorbing means is connected to the pressure control means to absorb the surge pressure.

According to the flowable material injection device of the present invention,
A fluid material injecting device for injecting a fluid material such as an injecting material by an injecting means provided for an injection target such as a ground or a structure, in which the injecting material and the injecting means are communicated with each other. The pressure control means is connected to the pipeline, and the pressure control means generates a predetermined set injection pressure of the fluid material and a pressure lower than the predetermined set injection pressure in the pumping pipeline to set the injection pressure of the fluid material to an arbitrary value. It has a function of controlling so that the injection is performed at a pressure lower than a predetermined set injection pressure in the continuous time.

As the pressure control means, a negative pressure generating means is provided, and the negative pressure generating means is used so as to transmit the negative pressure generated by the negative pressure generating means to the pressure feeding pipeline via the negative pressure transmitting means. It is preferable that the negative pressure transmitting means is connected to the negative pressure transmitting means by a pressure transmitting pipe line in which a pressure transmitting fluid is sealed.

Further, according to the fluid material injection device of the present invention, the fluid material injection pressure is controlled so as to be lower than a predetermined set injection pressure in any repeated cycle.

For the pressure control of the above-mentioned repeated cycle, it is preferable that the pressure control means is provided with a pulsation generating means such as a plunger pump to generate and control the pulsation.

The pressure lower than the predetermined set injection pressure is lower than the resistance pressure acting on the injection material such as earth pressure or water pressure around the injection means in the injection target.

Further, surge pressure absorbing means is connected to the pressure control means.

Conventionally, in a filter using gravel, sand, etc. for water purification, clogging is eliminated by passing water from the opposite direction to the filtering ability which decreases with the lapse of use time.
It is known that so-called backwashing is performed. According to the present invention, the pressure control means transmits an instantaneous negative pressure or a cyclic positive / negative repeated pressure for a predetermined time from an extremely short time to a continuous time, which is adapted to the injection target, to the pressure feeding pipeline, and the pressure feeding means injects the pressure. Is added to the basic pressure of the flowable material that is pumped toward. Therefore, with respect to the injection pressure of the fluid material from the injection means, a lower pressure than ground pressure, water pressure, etc. is generated, clogging is prevented in the same manner as the backwash, and the injection amount decreases with the passage of time. Without injection.

When a low pressure is momentarily generated with respect to ground pressure, water pressure, etc., an excessive surge pressure may be generated, which may destroy or significantly disturb the composition of the injected object or the region. For this problem, it is desirable to connect surge pressure absorbing means to the pressure transmission line, and the surge pressure is suppressed by this device.

The surge pressure absorbing means is preferably a combination of an accumulator or surge tank with a flow rate adjusting valve.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, from an injection fluid pump 1 which is a pressure feeding means to an injection means 2 (for example, a nozzle, not shown) provided for an injection target of the ground or a structure,
The injecting material conduit 3 is communicated as a pressure feeding conduit. The pressure control means C is connected to the injection material conduit 3. The pressure control means C is connected to the negative pressure generation means 5, the negative pressure transmission means 6, and one end of the negative pressure transmission means 6 from the negative pressure generation means 5, and the other end is connected to the injection material conduit 3. And the pressure transmission line 9 that is formed.

The pressure transmission line 9 is filled with a pressure transmission fluid which is an incompressible fluid and does not cause a phase change (for example, boiling) during operation. Further, the inside of the negative pressure transmitting means 6 is isolated by, for example, a diaphragm, the negative pressure generated by the negative pressure generating means 5 is transmitted by the incompressible fluid, and the volume change thereof is injected by the flexibility of the diaphragm. It is configured to be transmitted to the injection material in the material pipe line 3. The diaphragm in the negative pressure transmitting means 6 is
The pressure transmitting fluid and the injecting material are separated from each other, and the negative pressure generating means 5 is provided.
The type that transmits the pressure generated by the method to the injection material, such as a slidable plunger, may be used, and the type thereof is not limited.

Further, the pressure transmission pipe 9 is connected to the accumulator 7 via the flow rate adjusting valve 8 to constitute a surge pressure absorbing means 10. The surge pressure absorbing means 10 is not limited to the accumulator, but may be any means that can absorb the surge pressure, and may be, for example, a surge tank or a hydraulic cylinder, and is not limited to these examples. Further, the flow rate adjusting valve 8 is a means for facilitating the adjustment of the degree of absorbing the surge pressure, and is not necessarily attached. Then, in order to adjust the degree of absorption of surge pressure, a means 11 for supplying a compressive fluid under pressure may be connected to the accumulator 7 or a surge tank.

The negative pressure generating means 5 is a pulsating negative pressure generating means which is composed of a plunger pump which converts a rotational force by a motor (not shown) into a reciprocating motion by a crankshaft, and which repeatedly generates periodic pulsation. In general, the plunger pump is multi-connected for the purpose of suppressing pulsation,
In the present invention, a single-acting type is preferable for giving pulsation, and discontinuity may be created by not using some of the multiple plungers. Further, it is more effective because a large pulsation waveform can be obtained by selecting one having a large stroke for the bore of the plunger pump. Further, a motor for operating the negative pressure generating means (plunger pump) 5 is generally an AC inverter system, and a hydraulic motor or the like may be used. Then, the cycle of the generated negative pressure and the operating time are controlled by controlling the rotation speed.

In this way, the volume change amount and the rate of change of the negative pressure generating means 5 are appropriately combined and transmitted to the negative pressure transmitting means 6 via the pressure transmitting fluid, so that the injecting material in the injecting material conduit 3 is transmitted. With respect to the initial pressure (indicated by symbol A), a cyclic high and low pressure is generated as indicated by symbol B between the pressure control means C (negative pressure transmitting means 6) and the injection means 2.

The negative pressure generating means 5 may have any structure other than the above-mentioned plunger system as long as it has a structure capable of causing a volume change, and its structure is not particularly specified. Further, the negative pressure generating means 5 and the negative pressure transmitting means 6 may be integrally formed or may be installed separately. Further, the structure may be such that the plunger of the negative pressure generating means 5 directly transmits the negative pressure to the injection material in the injection material pipe line 3.

With the above construction, the pressure control means C is shown in FIG.
As shown in, the “predetermined set injection pressure of the fluid material” P
In other words, 0, that is, the pressure at which the injection material or the like can penetrate into the injection target such as the ground or the structure, and the "pressure lower than the predetermined set injection pressure" P1 are generated in the injection material pipe 3. Then, as the "pressure lower than the predetermined set injection pressure" P1, a pressure lower than the resistance pressure P10 acting on the injection material of the earth pressure or water pressure around the injection means 2 in the injection target is an arbitrary duration t Time T (variable from 0 to infinity) is repeated. In addition, in the above description, "negative pressure" means
It refers to the low pressure with respect to the earth pressure and water pressure indicated by the symbol Pn in FIG.

This injection pressure P acts on the injection part either instantaneously or periodically at high or low pressure by appropriately selecting the volume change amount and the temporal volume change rate in the negative pressure generating means 5 (see FIG. 2). (Indicated by symbol p in FIG. 2), the injection can be promoted, so-called clogging can be prevented, and the injection flow rate that decreases with the passage of time can be improved.

Further, with respect to surge pressure generated due to excessive volume change amount and change rate, accumulator 7 is provided to suppress the generation of excessive surge pressure. And
A flow rate adjusting valve 8 is provided between the negative pressure transmitting means 6 and the accumulator 7.
And the surge pressure absorbing means 10 is configured by
The adjustment of the pressure can be set arbitrarily.

[0028]

The present invention is constructed as described above and produces the following effects. (1) In the chemical solution injection work performed for the purpose of ground improvement, a short or instantaneous pressure is applied to the injected chemical solution and a lower pressure than the earth pressure or water pressure acting on the injection part in the natural state is generated, It promotes the injection and improves the injection flow rate, which decreases over time. (2) In grout work for cracked rocks containing microcracks in the rock mass, a lower pressure such as ground pressure or water pressure is generated in the grout material to be injected in the same manner as in the preceding paragraph, promoting the injection and decreasing with time. Increase injection flow rate. (3) In repair work in which a liquid or other fluid material is infiltrated for the purpose of repair filling, such as cracks or narrow spaces in concrete structures, the filling material to be injected has a lower pressure than the ground pressure or water pressure as in the previous section. Generate
It promotes the injection and improves the injection flow rate, which decreases over time. (4) The problem of destroying or significantly disturbing the composition of the injected object or region due to the generation of excessive surge pressure is
This can be prevented by connecting surge pressure absorbing means to the pressure transmission line.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a diagram illustrating an injection pressure.

[Explanation of symbols]

1 ... Injection fluid pump 2 ... injection means 3 ... Injection material pipeline 5 ... Negative pressure generating means 6 ... Negative pressure transmission means 7 ... Accumulator 8 ... Flow control valve 9 ... Pressure transmission line 10 Surge pressure absorbing means C ... Pressure control means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takuji Yamamoto             Kashima-ken, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo             Inside the corporation (72) Inventor Kensuke Date             Kashima-ken, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo             Inside the corporation (72) Inventor Keisuke Hibiya             Kashima-ken, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo             Inside the corporation (72) Inventor Hiroshi Yoshida             Chemika, 1-6-4 Moto-Akasaka, Minato-ku, Tokyo             Inside Le Grout Co., Ltd. (72) Inventor Kasukawa Masanori             Chemika, 1-6-4 Moto-Akasaka, Minato-ku, Tokyo             Inside Le Grout Co., Ltd. (72) Inventor Mihashi Kiyomi             Chemika, 1-6-4 Moto-Akasaka, Minato-ku, Tokyo             Inside Le Grout Co., Ltd. (72) Inventor Yasunobu Oba             Chemika, 1-6-4 Moto-Akasaka, Minato-ku, Tokyo             Inside Le Grout Co., Ltd. (72) Inventor Shirai Shunsuke             Chemika, 1-6-4 Moto-Akasaka, Minato-ku, Tokyo             Inside Le Grout Co., Ltd. (72) Inventor Yasuto Nakajima             Ichiguchi, Kuji, Iwate Prefecture, Closed, Ichiguchi 8th area 105             Address No. 2 Japan Underground Oil Storage Kuji Co., Ltd.             In the office (72) Inventor Yoshiyuki Hoshino             Ichiguchi, Kuji, Iwate Prefecture, Closed, Ichiguchi 8th area 105             Address No. 2 Japan Underground Oil Storage Kuji Co., Ltd.             In the office F-term (reference) 2D040 AA06 AB01 AC01 BB03 CB03                       CD03 FA00 FA08 FA09                 2E176 AA01 BB11

Claims (8)

[Claims] 1. A method of injecting a fluid material such as an injectable material by an injecting means provided to an injection object such as a ground or a structure by injecting the fluid material by an injecting means, the injecting means and the injecting means. A pressure control means is connected to a pressure-feeding conduit communicating with, and a predetermined set injection pressure of the fluid material and a pressure lower than the predetermined set injection pressure are generated in the pressure control means in the pressure control means, and A method for injecting a fluid material, characterized in that the injection pressure is set to a pressure lower than a predetermined set injection pressure with an arbitrary duration. 2. The method for injecting a fluid material according to claim 1, wherein the fluid material is injected at a pressure lower than a predetermined set injection pressure in an arbitrary repeating cycle. 3. The flow according to claim 1, wherein a pressure lower than the predetermined set injection pressure is lower than a resistance pressure acting on the injection material such as ground pressure or water pressure around the injection means in the injection target. Method of injectable material. 4. The method for injecting a fluid material according to claim 1, wherein surge pressure absorbing means is connected to the pressure control means to absorb the surge pressure. 5. A fluid material injecting device for injecting a fluid material such as an injecting material by means of an injecting means, and injecting it from an injecting means provided for an object to be infused such as a ground or a structure, wherein the injecting means and the injecting means. A pressure control means is connected to a pressure feeding pipe line communicating with the pressure control means, and the pressure control means generates a predetermined set injection pressure of the fluid material and a pressure lower than the predetermined set injection pressure in the pressure feed pipe line to generate the fluid material. An injecting device for a fluid material having a function of controlling an injecting pressure to be an injecting pressure at a pressure lower than a predetermined injecting pressure for an arbitrary duration. 6. The fluid material injection device according to claim 5, wherein the injection pressure of the fluid material is controlled to be lower than a predetermined set injection pressure in an arbitrary repeated cycle. 7. The pressure lower than the predetermined set injection pressure is a pressure lower than a resistance pressure acting on the injection material such as ground pressure or water pressure around the injection means in the injection target.
Alternatively, the injecting device for a fluid material according to item 6. 8. The fluid material injection device according to claim 5, wherein surge pressure absorbing means is connected to the pressure control means.