JP2007046320A - Grouting apparatus and grouting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grouting apparatus which carries out grouting of a hardener from inner pipe injection ports via outer pipe injection ports into the ground, wherein the grouting apparatus can acquire correct injection pressure thereof into the ground, and to provide a grouting method. <P>SOLUTION: The grouting apparatus A has an outer pipe 1 and an inner pipe 2 inserted into the outer pipe 1, and functions to inject the hardener into the ground 3 to harden the same, and the grouting method is implemented by using the grouting apparatus A. The inner pipe 2 is inserted into the outer pipe 1 such that the outer injection ports 4 are each located between inner pipe packers 5, 5 adjacent to each other, and that a space 7 is defined by the inner pipe packers 5, 5 in the outer pipe 1. Further a pressure transmission member 8 for sensing the pressure in the space 7 and transmitting a sensed value, is set in the grouting apparatus A, and the pressure value sensed in the space is transmitted via the pressure transmission member to a pressure gage, to thereby acquire the correct injection pressure at each inner pipe injection port 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ground injection device and a ground injection method for injecting a consolidation material into the ground to consolidate the ground, and in particular, an outer pipe having a plurality of outer pipe discharge ports at different positions in the axial direction, and a plurality of A ground injection device comprising an inner tube inserted into the outer tube and having an inner tube discharge port between adjacent inner tube packers, and a ground using the same Specifically, it is possible to accurately grasp the injection pressure into the ground when injecting the consolidated material from the inner pipe outlet located between the inner pipe packers into the ground through the outer pipe outlet. The present invention relates to a ground injection device and a ground injection method.

  When injecting consolidated material into the ground using a ground injection device consisting of an outer pipe and an inner pipe inserted into the outer pipe, conventionally, the injection pressure in the injection pipe was measured with a pressure gauge located on the ground surface. It was.

  However, this injection pressure is actually the resistance pressure of the injection pipe and the resistance pressure of the inner pipe outlet added to the original ground injection pressure penetrating between the soil particles, It does not indicate. In particular, when the inner pipe discharge port is an injection port composed of fine holes, the inner pipe pressure increases due to the resistance force of the injection port, and the pressure in the actual ground cannot be grasped. There is a problem that the determination of whether or not the determination is made cannot be confirmed by the change in the injection pressure.

In other words, this pressure is largely influenced by the liquid supply pressure in the ground part and the resistance pressure of the inner pipe flow path and the discharge port. It is unclear whether the ground has been destroyed and the infusion has gone.
None

  Therefore, the problem to be solved by the present invention is that when injecting the consolidated material from the inner tube outlet located between the inner tube packers into the ground through the outer tube outlet, the injection pressure from the outlet into the ground It is an object of the present invention to provide a ground injection device and a ground injection method that directly and accurately grasp the above-described problems and improve the above-described drawbacks of the known technology.

  In order to solve the above-described problems, according to the ground injection device of the present invention, the ground pipe includes an outer pipe and an inner pipe inserted into the outer pipe, and a solidified material is injected into the ground to solidify the ground. The outer pipe has an outer pipe discharge port on the outer pipe surface, the inner pipe is provided with a plurality of inner pipe packers at intervals, and between the inner pipe packers adjacent to each other. When the inner pipe is inserted into the outer pipe, the outer pipe outlet is positioned between adjacent inner pipe packers, and a space is formed between the inner pipe packers in the outer pipe. In the ground injection device inserted in such a manner, a pressure transmission member that senses and transmits the pressure in the space is installed in the injection device, and the pressure sensed in the space is transmitted through the pressure transmission member. It is characterized by grasping the accurate ground injection pressure.

  Furthermore, in order to solve the above-described problem, according to the ground injection device of the present invention, the ground injection device includes an outer tube and an inner tube inserted into the outer tube, and the ground material is injected by injecting a consolidated material into the ground. A ground injection device for consolidation, wherein the outer tube has one outer tube surface or a plurality of outer tube discharge ports at different axial positions, and the inner tube has a plurality of inner tube packers spaced from each other. And having an inner tube discharge port between adjacent inner tube packers, and inserting the inner tube into the outer tube so that the outer tube discharge port is positioned between the adjacent inner tube packers. Thus, in the ground injection device in which a space is formed between the inner tube packers in the outer tube, a strain resistance type pressure sensor disposed in the space, and a signal cable is connected to the strain resistance type pressure sensor. Connect the connected amplifier and the signal cable to this amplifier. A pressure transmission member comprising a pressure display device on the ground connected to the ground is installed in the injection device, the pressure sensor senses the pressure in the space, and the sensed pressure in the space is connected to the signal cable via an amplifier. It is characterized in that an accurate injection pressure of the ground is grasped by transmitting it to the pressure display device as an electrical signal through the measurement.

  Furthermore, in order to solve the above-described problem, according to the ground injection device of the present invention, the ground injection device includes an outer tube and an inner tube inserted into the outer tube, and the ground material is injected by injecting a consolidated material into the ground. A ground injection device for consolidation, wherein the outer tube has one outer tube surface or a plurality of outer tube discharge ports at different axial positions, and the inner tube has a plurality of inner tube packers spaced from each other. And having an inner tube discharge port between adjacent inner tube packers, and inserting the inner tube into the outer tube so that the outer tube discharge port is positioned between the adjacent inner tube packers. Then, in the ground injection device in which a space is formed between the inner tube packers in the outer tube, a strain resistance type pressure sensor connected to the space through a tube, and an amplifier coupled to the pressure sensor, On the ground connected to the amplifier via a signal cable A pressure transmission member comprising a pressure display device is installed in the ground injection device, and one end of the tube located in the space senses the pressure in the space, and the sensed pressure is displayed via a pressure sensor and an amplifier. It is characterized in that it is transmitted to the apparatus and measured, and the accurate injection pressure of the inner pipe discharge port is grasped.

  Furthermore, in order to solve the above-described problems, according to the ground injection method of the present invention, in the ground injection method for injecting a caking material into the ground and solidifying the ground, one outer tube discharge port on the surface Or an outer tube having a plurality of outer tube outlets at different positions in the axial direction, and a plurality of inner tube packers inserted into the outer tube at intervals, and between the inner tube packers adjacent to each other. Uses a ground injection device comprising an inner tube having an inner tube discharge port, and when the inner tube is inserted into the outer tube, the outer tube discharge port is located between adjacent inner tube packers, and the inner tube The inner tube packer is inserted so that a space is formed, and a pressure transmission member that senses and transmits the pressure in the space is installed in the injection device, and is sensed in the space through the pressure transmission member. The transmitted pressure and measure the transmitted pressure Characterized in that to grasp the precise injection pressure of the discharge port.

  The above-described present invention uses a ground injection device including an outer tube and an inner tube inserted into the outer tube, and the outer tube has one outer tube discharge port on the surface of the outer tube or a different position in the axial direction. A plurality of outer pipe outlets, the inner pipe having a plurality of inner pipe packers spaced from each other, and having an inner pipe outlet between adjacent inner pipe packers; When inserting a tube, it is inserted so that an outer tube discharge port is located between adjacent inner tube packers and a space is formed between the inner tube packers in the outer tube. By installing a pressure transmission member that senses and transmits the pressure, the pressure sensed in the space is transmitted through the pressure transmission member, and the transmitted pressure is measured to accurately inject the inner pipe outlet. Know the pressure directly.

  Further, in the present invention, the strain resistance type pressure sensor located in the space in the injection device, one end connected to the pressure sensor via an amplifier, and the other end connected to a pressure display device on the ground. A pressure transmission member comprising a signal cable is installed, the pressure sensor senses the pressure in the space, and the sensed pressure in the space is transmitted as an electrical signal to the pressure display device through the signal cable via the amplifier, Directly know the exact injection pressure at the outlet.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view of a specific example of a ground injection device according to the present invention, FIG. 2 is a partial cross-sectional view of another specific example of a ground injection device according to the present invention, and FIG. FIG. 4 is a cross-sectional view of still another specific example of the ground injection device, and FIG. 4 is a cross-sectional view of still another specific example of the ground injection device according to the present invention.

  In FIG. 1, a ground injection device A according to the present invention includes an outer tube 1 and an inner tube 2 inserted into the outer tube 1, and a solidified material (ground injection solution) is placed in the ground 3. The ground 3 is consolidated by pouring.

  The outer tube 1 has a plurality of outer tube discharge ports 4 at different positions in the axial direction, and the inner tube 2 includes a plurality of inner tube packers 5 at intervals, and the inner tube packers 5 adjacent to each other, 5 is configured to have an inner tube discharge port 6. The inner tube discharge port 6 is an injection port composed of fine holes.

  When the inner tube 2 is inserted into the outer tube 1 described above, the outer tube discharge port 4 is positioned between the adjacent inner tube packers 5 and 5, and the inner tube packers 5 and 5 in the outer tube 1 are disposed. It inserts so that the space 7 may be formed.

  A feature of the present invention is that in the above-described injection device A of the present invention, a pressure transmission member 8 that senses and transmits the pressure in the space 7 is installed in the ground injection device A, and is detected in the space 7 through the pressure transmission member 8. The measured pressure is transmitted and measured, and the accurate injection pressure of the inner tube discharge port 6 is grasped.

  Specifically, the pressure transmission member 8 is a tube 8, and one end 11 is positioned at the pressure detection unit 12 in the space 7 to sense the pressure in the space 7, and the other end 13 passes through the inner pipe 2 to the ground. The pressure in the space 7 is measured by the pressure gauge 14 and the pressure in the space 7 between the outer pipe 1 outside the inner pipe discharge port 6 and the inner pipe 2 is measured. . This space 7 communicates with an injection region of a predetermined stage via a rubber sleeve 19 of the outer tube discharge port 4, and the rubber sleeve 19 only covers the outer tube discharge port 4 loosely. Does not exceed the injection pressure of the injection ground of the injection solution at the injection stage

  That is, the injection material from the storage tank 15 passes through the injection pump 16, the flow meter 17, the pressure gauge 18, and the inner tube 2, and further passes through the space 7 from the inner tube discharge port 6, passes through the outer tube discharge port 4, and rubber. The sleeve 19 is expanded and injected into the ground 3. At this time, the injection pressure of the injection solution from the inner pipe discharge port 6 is determined in the injection ground by directly measuring the pressure in the space 7 with the pressure gauge 14 on the ground 3 through the tube 8. it can. Of course, when injecting an infusion solution having a long gelation time, the inside of the tube 8 is filled with the infusion solution filling the space 7 as it is, and the pressure can be directly measured by the pressure gauge 14 to know the injection pressure. If the gelation time is long, there is no possibility of gelation in the tube 8, but if there is a possibility of gelation, the tube 8 may be washed with water with the hand pump 20 occasionally.

  In the conventional injection device, the injection pressure of the injection pump 16 is measured by the pressure gauge 18 and the ground injection pressure is measured, but the display pressure is the resistance pressure in the injection pipe and the resistance pressure from the inner pipe discharge port to the original ground. The actual pressure in the ground is unknown. In particular, when the inner tube discharge port 6 is an injection nozzle made of a thin tube, it is difficult to grasp the change in the ground injection pressure because the resistance pressure of the injection port is large. Since the apparatus of the present invention directly measures the ground injection pressure, it knows the change in the injection pressure at the injection stage, thereby knowing whether it has infiltrated between the soil particles, the change in the situation, and the change in the case of split injection.

  In the above, one end 11 of the tube 8 located in the space 7 can be covered with a film (not shown). In this case, if the pressure in the space 7 is filled with a liquid such as water in the tube 8 by the hand pump 20, the injection pressure in the ground in the space 7 detected by the membrane is applied to the pressure gauge 14 via the liquid. Measured by transmitting and reading this pressure. The film is a thin film, preferably an expansion / contraction film.

  In the case where there are a plurality of spaces 7, as shown in FIG. 2, the branch inner pipe 2a is branched into the inner pipe 2, and the tubes 8, 8 are respectively connected to the pressure detector 12 through the inner pipe 2 and the branch inner pipe 2a. The pressure can be transmitted to the gauges 14 and 14a, and the pressures in the separate spaces 7 at the respective pressure gauges 14 and 14 can be measured.

  Further, as shown in FIG. 3, the pressure transmission member 8 includes an outer tube 1 and an inner tube 2 inserted into the outer tube 1. The outer tube 1 has a plurality of outer tube discharge ports 4 at different positions in the axial direction, and the inner tube 2 includes a plurality of inner tube packers 5 at intervals. In addition, an inner tube discharge port 6 is provided between the inner tube packers 5 and 5 adjacent to each other, and when the inner tube 2 is inserted into the outer tube 1, the outer tube discharge between the adjacent inner tube packers 5 and 5 is performed. A strain resistance type pressure sensor disposed in the space 7 in the ground injection device A in which the space 4 is formed between the inner tube packers 5 and 5 in the outer tube 1 by being inserted so that the outlet 4 is located. 21, an amplifier 24 connected to the strain resistance pressure sensor 21 via a signal cable 26, and the amplifier 24 The pressure transmitting member 8 made of a signal cable 26 via the connection has been ground 3 on pressure indicating device 25. may be installed in the ground implanter A.

  In this case, the pressure sensor 21 senses the pressure in the space 7 and transmits the sensed pressure in the space 7 through the amplifier 24 and the signal cable 26 to the pressure display device 25 as an electrical signal, so that an accurate ground injection pressure can be obtained. I can grasp it.

  Further, as shown in FIG. 4, the pressure transmission member 8 includes an outer tube 1 and an inner tube 2 inserted into the outer tube 1. A ground injection device A for consolidation, wherein the outer tube 1 has a plurality of outer tube discharge ports 4 at different positions in the axial direction, the inner tube 2 includes a plurality of inner tube packers 5 at intervals, and When the inner tube 2 is inserted into the outer tube 1, the outer tube discharge port 4 is provided between the adjacent inner tube packers 5 and 5. In the ground injection device A, in which the space 7 is formed between the inner tube packers 5 and 5 in the outer tube 1 by being inserted so as to be positioned, the strain resistance type pressure connected to the space through the tube 8 A sensor 21, an amplifier 24 connected to the pressure sensor 21, and a signal cable 26 connected to the amplifier 24. The pressure transmitting member 8 made of a pressure display device 25. on board 3 may be installed in the ground implanter A.

  In this case, one end 11 of the tube 8 located in the space 7 senses the pressure in the space 7, and the sensed pressure is transmitted to the pressure display device 25 via the pressure sensor 21 and the amplifier 24, and is measured. Understand proper ground injection pressure.

  Using the ground injection device A of the present invention configured as described above, the outer tube discharge port 4 is located between the adjacent inner tube packers 5 and 5, and between the inner tube packers 5 and 5 in the outer tube 1. Further, a pressure transmission member 8 for sensing and transmitting the pressure in the space 7 is installed in the injection device A, and the pressure is detected in the previous space 7 through the pressure transmission member 8. Measure the transmitted pressure and grasp the exact ground injection pressure.

  The above-described ground injection device A of the present invention is installed on the ground 3 as shown in FIGS. 5 (a) to 5 (d), for example. This will be described in detail. First, as shown in FIG. 5A, the ground 3 is bored, and the casing 27 is inserted therein. Next, as shown in FIG. 5 (b), the outer tube 1 is inserted into the casing 27. The outer tube 1 has a plurality of outer tube discharge ports 4, 4, 4 opened at predetermined intervals at different positions in the axial direction of the tube wall 1 a, and the outer tube discharge ports 4, 4, 4 are Each is covered with a rubber sleeve 19.

  Further, after the seal grout 28 is injected into the casing 27 as shown in FIG. 5 (b), the casing 27 is pulled out as shown in FIG. 5 (c). As a result, the outer tube 1 is sealed with the seal grout 28.

  Next, as shown in FIG. 5 (d), the inner tube 2 is inserted into the outer tube 1. The outer tube 1 has a plurality of outer tube discharge ports 4 at different positions in the axial direction, and the inner tube 2 is provided with a plurality of inner tube packers 5 at intervals, and between the adjacent inner tube packers 5 and 5. An inner tube discharge port 6 is provided.

  When inserting the inner tube 2 into the outer tube 1, the outer tube discharge port 4 is located between the adjacent inner tube packers 5 and 5, and between the inner tube packers 5 and 5 in the outer tube 1. It is inserted so that the space 7 is formed.

  Furthermore, a tube 8 is installed in the inner tube 2 of the injection device A as a pressure transmission member. One end 11 of the tube 8 is located in the space 7 and senses the pressure in the space 7, and the other end is connected to a pressure gauge on the ground 3 (not shown). taking measurement.

  Although the inner tube packer 5 is not shown in the drawing, a fluid channel dedicated to the packer independent of the inner tube 2 passage for injecting liquid is installed in the inner tube 2, and the inner tube packer 5 is expanded and contracted through this fluid channel. In this case, a gas such as air or a fluid such as water is press-fitted into the inner tube packer 5 through a flow passage dedicated to the packer to expand the packer to form a space 7, and then the injected liquid is passed through the inner tube 2. Through the inner tube discharge port 6, the outer tube discharge port 4 is injected into the ground 3. At this time, the pressure in the space 7 is accurately measured by the pressure gauge on the ground 3 through the tube 8 as a pressure transmission member.

  Furthermore, the thing of the structure shown in FIG. 6 is used as the ground injection apparatus A concerning this invention. In FIG. 6, the outer tube 1 is provided with a plurality of outer tube packers 29 so as to sandwich the outer tube discharge port 4, and the consolidated material is pushed into the outer tube packer 29 through the discharge port 30 in the outer tube packer and the rubber sleeve 31 is pushed. It expands, fills, expands, settles in the ground 3 and is installed. Then, by inserting the inner tube 2 into the outer tube 1 and feeding the injected solution into the flow path of the inner tube 2, the expandable inner tube packer 5 expands due to the pressure of the injected solution and moves up and down. A space 7 in the outer tube 1 is formed between the plurality of inner tube packers 5 and 5 adjacent to each other.

  The injected liquid is further discharged from the inner tube discharge port 6 into the outer tube 1 outer space 32 through the space 7 in the outer tube 1 and the outer tube discharge port 4 and is injected into the ground 3 from here. Further, the inner tube 2 is moved and the injection is repeated. Since the outer space 32 is a columnar injection source having a large surface area, even if it is injected at a large injection rate, the injection rate from the unit area of the injection source is small, so that it can be injected between soil particles at a low pressure. Rapid osmotic injection is possible. The outer tube packer 29 is a water-permeable bag, and the outer tube packer 29 is filled with a caking material and expanded to a diameter larger than the diameter of the hole 33 to form a packer in the soil. The pipe 1 is fixed and installed on the ground 3. In FIG. 6, 34 is a fastener.

  Moreover, in this invention, as shown in FIG. 7, the flow path of the inner tube | pipe 2 can also be made into multiple by providing the multiple inner tubes 2. As shown in FIG. In this case, each of the inner pipe discharge ports 6, 6... 6 is opened to a different outer pipe inner space 7. As a result, not only can multiple injection stages be injected at the same time to enable rapid construction of long injection sections, but also injection materials with different permeability and strength can be injected according to the state of the soil layer, and the main material It is also possible to superimpose and inject the reactant on the injection stage in which the solution is injected, or to inject the solution type grout on the region where the suspension is injected. At this time, although not shown, if a plurality of inner pipe discharge ports are opened in the same outer pipe inner space, two types of injection liquids, for example, a main ingredient compounding liquid (A liquid) and a reactant compounding liquid (B liquid) can be obtained. The mixed liquid is mixed in the space 7 and injected into the ground 3 from the outer tube discharge port 4. The plurality of inner pipes may be parallel pipes or multiple pipes.

Further, the inner pipe discharge port 6 is formed so as to satisfy any of the following (a) to (c).
(A) The inner pipe discharge port 6 is formed in a fine hole. This state is shown in FIG.
(B) The inner tube discharge port 6 is formed in a smaller pore than the inner tube packer 5 discharge port 10. This state is shown in FIGS. 8 (a) and 8 (b).
(C) The area of the inner pipe discharge port is formed smaller than the cross-sectional area of the inner pipe 2 flow path. This state is shown in FIGS. 8 (a) and 8 (b).

  The inner pipe discharge port 6 is covered with a resistor such as a rubber sleeve 31 as shown in FIG. 8C, or a check valve 35 is attached as shown in FIG. 8D. The check valve 35 is configured, for example, such that a ball 36 is applied from the outside to the inner tube discharge port 6 and the ball 36 is pressed by a spring 37. The pores are formed as injection nozzles.

  Furthermore, as shown in FIG. 9, a decompression device 38 can be provided in the inner pipe 2 flow path. Furthermore, as shown in FIG. 10, the inner tube 2 may be formed by connecting with a flexible joint. 10A is an example in which one inner pipe is connected by a flexible joint, and FIG. 10B is an example in which a plurality of inner pipes are connected by a flexible joint.

  The inner tube packer 5 is formed of a synthetic rubber bag which is impermeable and rich in elasticity. Therefore, when the internal pressure due to the injected liquid acts on the inner tube packer 5, the inner tube packer 5 expands and comes into close contact with the inner wall of the outer tube 1 to form a packer. However, when the feeding of the injected liquid is stopped or the pressure of the injected liquid is reduced by the depressurizing device 38 provided in the inner pipe flow path as shown in FIG. 1 away from the inner wall. Therefore, it is possible to immediately move to the next injection stage after completing a predetermined amount of injection at a predetermined stage. The depressurization device 38 only needs to be downstream from the infusion pump, and may be only a valve such as a three-way cock in the figure. When the valve is opened, the injected liquid pressurized in the inner pipe is discharged to the outside, and the inner pipe packer contracts. Furthermore, if the injection liquid in the inner pipe is sucked up by the water absorption pump, it is possible to minimize the leakage of the injection liquid in the inner pipe into the outer pipe when moving the injection stage.

  When the injection depth is increased or the horizontal installation length of the injection pipe is increased, the outer pipe 1 is deformed by earth pressure. Therefore, it becomes difficult to insert and move the inner tube 2. However, as shown in FIGS. 10A and 10B, the inner tube 2 can cope with the deformation of the outer tube 1 by providing a hose-like flexible joint 39 made of synthetic rubber at a predetermined position of the inner tube 2. Thus, the inside of the outer tube 1 can be turned. Further, the inner tube packer 5 is a rubber packer and contracts upon completion of injection at a predetermined stage. For this reason, the inner tube 2 can be easily transferred within the outer tube 1. Further, since the conventional air packer is unnecessary, the diameter of the inner tube 2 can be reduced, and from this point, the outer tube can be adapted to deformation. In the present invention, the inner pipe may be formed of a hard pipe, but by forming the inner pipe with a hose on the near side from the range where the inner pipe discharge port exists, it is free with a lifting device with a scraper. It is possible to move in the outer tube.

  When the injection material used in the present invention is gelled in the inner tube packer 5, the packer will not function. Therefore, a material that has a long gelation time and is difficult to clog is desirable. Accordingly, it is preferable that the gelation time in the air is longer than the gelation time in the soil. Such an injection material does not cause gelation in the inner pipe flow path or the inner pipe packer even after the injection solution injected into the soil has gelled. The packer function can be continued by repeatedly contracting and expanding the packer until it is transferred to the injection stage and injected. Further, the pressure in the outer tube inner space 7 can be transmitted to the pressure gauge 14 without gelation even when passing through the tube. Examples of this type of injection material include non-alkaline water glass grout, or grout mainly composed of activated silica obtained by dealkalizing water glass with an ion exchange resin or ion exchange membrane. These grouts have a gel time of 10 hours or more in the air, but retain a gel time of several hours in the soil. Thus, they allow a wide range of injections for a long time. An alkaline water glass grout having a gel time of 1 hour or longer can also be used.

  Here, the basic principle of the packer function will be described with reference to FIG. FIG. 9 is an explanation of an experimental apparatus including the outer tube 1 and the inner tube 2 loosely inserted therein, and the discharge valve 40 is closed to close the outer tube 1, the inner tube 2, the inner tube packer 5, The relationship of the pressure with respect to the minimum unit of the device A of the present invention composed of the outer tube inner space 7 and the outer tube discharge port 4 will be described.

First, the injection solution is sent from the inner tube flow path of the inner tube 2 at the pressure P ₀ and the flow rate F ₀ . The pressure P ₀ is measured by the pressure gauge 41, and the flow rate F ₀ is measured by the flow meter 42. The inner tube 2 and the inflatable inner tube packer 5 communicate with each other through the inner tube packer outlet 10 and the inner tube packer 5 expands. This internal pressure is the same as the pressure P _{0 of the} injected liquid.

On the other hand, the outer tube discharge port 4 of the outer tube 1 is provided with a flow pressure adjusting device 43. If the pressure regulating valve 44 of the device 43 is opened, the pressure P _{1 in the} outer pipe inner space 7 is naturally lower than P _{0 because the} space 7 is open to the outside. The pressure and flow rate at this time are measured by the pressure gauge 45 and the flow meter 46 of the flow rate pressure adjusting device 43. Therefore, as long as the feeding pressure of the injected liquid is applied to the inner pipe 2, the inner pipe packer 5 expands and is formed as a packer, and the injected liquid discharged from the inner pipe discharge port 6 passes through the outer pipe inner space 7. It is discharged from the outer tube discharge port 4 to the outside.

When the pressure regulating valve 44 is gradually closed to lower the opening degree, the pressure of the pressure gauge 45 rises (P ₁₁ ). At this time, if the liquid feeding flow rate F ₀ is the same, the inner pipe pressure P ₁ becomes higher than the pressure P ₀ . In this case, the pressure P ₁₁ is equivalent to the osmotic resistance pressure of the ground. However, as long as injection is performed in the ground, the pressure P ₁ is higher than the pressure P ₁₁ , so the pressure in the inner tube packer 5 naturally becomes the pressure P ₁ and the pressure in the outer tube inner space 7. since it is maintained higher than the P ₁₁ so that the injection continues.

  However, the inner tube packer 5 is formed until the injected liquid in the inner tube 2 comes out of the inner tube discharge port 6 and is injected into the ground through the outer tube discharge port 4. Since the outer tube inner space 7 is not sufficiently formed before the injection, the injected liquid moves up and down in the outer tube. Therefore, the injected solution moves in the outer tube and is injected into the ground from the unspecified outer tube discharge port 4, which is not preferable because it is not injected into a predetermined injection region. For this reason, it is preferable that the inner tube packer 5 has already been formed at the time of discharge from the inner tube discharge port 6 to the outer tube inner space 7. For this purpose, it is preferable to be in a pressurized state when discharging from the inner tube 2. That is, it is desirable that an initial pressure is generated.

The initial pressure refers to the pressure inside the tube that is generated when the injected liquid is discharged from the discharge port in the air. Usually, the injection rate per stage, that is, the injection rate from one injection section between the upper and lower packers is 2-30 liters / minute, but the initial pressure is 0.1 kgf / cm for such an injection rate. preferably it becomes ² or more, in which case, the inner pipe packer when infusate from the inner tube discharge port for discharging already inflated.

If an internal pressure of 0.1 kgf / cm ² or more is generated as an initial pressure, the packer is brought into close contact with the outer tube wall. In that case, the discharge port diameter is preferably about 0.1 to 3 mm. Actually, the initial pressure can be arbitrarily set by appropriately designing one discharge port diameter, the number of discharge ports, and the elasticity of the inflatable packer corresponding to the injection speed per stage. Can form a strong packer that can withstand Therefore, according to the present invention, the initial pressure can be easily formed by performing the following method, and the inner tube packer can be easily expanded faster than the discharge from the inner tube discharge port.

(A) The inner pipe discharge port is made into a fine hole such as an injection hole.
(B) The area of the inner pipe discharge port is smaller than the cross-sectional area of the inner pipe flow path.
(C) The inner tube packer discharge port is made larger than the inner tube discharge port.
(D) A check valve is provided at the inner pipe discharge port. In FIG. 8D, the injection solution is discharged into the outer tube space only after the pressure of the injection solution in the inner tube becomes larger than the force of the spring 37.
(E) Cover the inner tube discharge port with a discharge resistor. In FIG. 8C, if the rubber sleeve 31 is used and the discharge port is covered, the injected liquid is discharged into the outer pipe inner space when the pressure of the injected liquid in the inner pipe corresponding to the elasticity of the rubber sleeve 31 increases. The
The present invention has been completed based on the above basic principle. In FIG. 9, reference numeral 38 denotes a depressurizing device, which includes a liquid feed valve 47, a three-way cock 48, and a water absorption pump 49. A drain pipe 50 includes a three-way cock 51.

  As can be seen from FIG. 9, the injection pressure is measured by the pressure gauge 41. Therefore, in order to know the injection pressure in the ground after being discharged from the inner pipe discharge port 6, it is only necessary to calculate by subtracting the discharge pressure in the air, but the actual ground injection pressure during the injection is known. In accordance with the present invention described above, either the strain resistance pressure sensor corresponding to the strain gauge or the tube (pressure transmission member) corresponding to the pore water pressure gauge is installed in the outer pipe inner space 7 to inject into the outer pipe inner space 7. Calculates the liquid pressure of the liquid, collects the information in real-time wired or wirelessly in the control room on the ground, and manages the injection speed, injection pressure, and injection pipe operations such as injection interruption and completion based on the information By doing so, optimal injection can be performed. Of course, as in the present invention, a pressure transmission member is provided in the space, and by obtaining the information, fluctuations in the internal pipe pressure and the external osmotic pressure, and by obtaining information on the pressure difference, It is possible to accurately grasp the external gelation status and feed back to the injection management.

  These measuring sensors can usually be installed in the outlet flow path of the inner pipe discharge port 6 of FIG. 8 (d) or FIG. 9, but a strain gauge or earth pressure gauge is further attached to the outer wall between the packers of the inner pipe. You can also. Of course, it can also be embedded in the wall surface inside the outer tube. The information is sent to the ground by wire or wirelessly through the inner tube or along a groove or the like provided in the outer tube.

  In the apparatus of the present invention, an inner tube in which an inner tube packer flow path and an injection liquid flow path are configured independently as an inner pipe, and an injection nozzle for an inner pipe discharge port in which an injection liquid is provided between a number of inner pipe packers. It is also possible to break the seal grout through a plurality of outer tube outlets and simultaneously inject it into the ground. Also in this case, by providing one end of a tube as a strain resistance pressure gauge or a pressure transmission member in a plurality of spaces in the outer tube, it is possible to accurately measure injection pressures at a plurality of injection stages simultaneously.

  Furthermore, another injection device of the present invention is shown in FIGS. The apparatus shown in FIGS. 11 and 12 is an example in which a hard elastic synthetic resin packer 5 is used in place of the bag-like inner tube packer 5 which is expanded by the internal pressure of the injected liquid itself to form a packer. In this case, as shown in FIGS. 11 and 12, a plurality of synthetic resin inner tube packers 5 are provided on the outer wall of the inner tube 2 at intervals, and the injected liquid introduced from the inner tube 2 is discharged from the inner tube. The rubber sleeve 31 is pushed and expanded through the outlet 6 through the space 7 and the outer tube discharge port 4 and simultaneously injected into the ground 3. At this time, the pressure in the space 7 is sensed by one end 11 protruding into the pressure detecting portion 12 of the pressure transmitting member (hose) 8 and measured by a pressure gauge (not shown) to accurately grasp the injection pressure of the inner pipe discharge port 6. To do. The inner tube packer of FIGS. 11 and 12 is a bag packer made of an inflatable rubber or a synthetic resin, and communicates with a flow path of packer fluid independent of the injection liquid flow path in the inner pipe. It may expand and contract depending on the presence or absence of fluid pressure such as water to produce a packer function. (Not shown)

FIGS. 13 and 14 correspond to the pressure of the injection pump 16, the nozzle diameter, and the pressure of the pressure gauge 45 corresponding to the ground pressure when an injection nozzle is used as the inner tube discharge port 6 in the experimental apparatus of FIG. 9. It is the graph which showed the relationship with resistance pressure (kg / cm < ² >). According to the present invention, the pressure of the pressure gauge 45 in this case can directly measure the pressure of the injected liquid in the outer pipe inner space 32 at the ground part.

  In the present invention described above, a pressure transmission member that senses and transmits the pressure in the space is installed in the injection device, and the pressure sensed in the space is transmitted to the pressure gauge through the pressure transmission member, and the transmitted pressure is transmitted to the pressure gauge. By measuring with a pressure gauge on the ground, the injection pressure (solidified material) from the inner pipe outlet located between the inner pipe packers into the ground through the outer pipe outlet is injected into the ground. Can be accurately grasped on the ground and is highly applicable in the field of ground injection.

It is sectional drawing of one specific example of the ground injection apparatus concerning this invention. It is a fragmentary sectional view of the other specific example of the ground injection apparatus concerning this invention. It is sectional drawing of the other specific example of the ground injection apparatus concerning this invention. It is sectional drawing of the other specific example of the ground injection apparatus concerning this invention. The one process figure of the installation process to the ground of this invention injection apparatus is represented. The one process figure of the installation process to the ground of this invention injection apparatus is shown. The one process figure of the installation process to the ground of this invention injection apparatus is shown. The completion figure of the installation process to the ground of this invention injection apparatus is represented. It is sectional drawing of the other specific example of the ground injection apparatus concerning this invention. It is explanatory drawing of this invention injection apparatus provided with multiple inner tubes. It is explanatory drawing showing the discharge port in an inner tube packer, and an inner tube discharge port, Comprising: The relationship of a magnitude | size is represented. It is explanatory drawing showing the discharge port in an inner tube packer, and an inner tube discharge port, Comprising: The relationship of a magnitude | size is represented. Represents a rubber sleeve covered by the inner tube discharge port. It is explanatory drawing of the non-return valve attached to the inner pipe discharge port. It is explanatory drawing of the experimental apparatus for demonstrating the principle of the packer function of this invention. It is explanatory drawing of the state which connected the inner pipe | tube with the flexible joint. It is explanatory drawing of the state which connected the inner pipe | tube with the flexible joint. It is sectional drawing of the other specific example of the ground injection apparatus concerning this invention. It is sectional drawing of the other specific example of the ground injection apparatus concerning this invention. It is the graph showing the relationship between the resistance pressure (kg / cm < ² >) of nozzle diameter 1.0mm, and the flow volume (l / min) from a nozzle. It is the graph showing the relationship between the resistance pressure (kg / cm < ² >) of nozzle diameter 2.5mm, and the flow volume (l / min) from a nozzle.

Explanation of symbols

A Ground injection device 1 Outer tube 1a Tube wall 2 Inner tube 2a Branch inner tube 3 Ground 4 Outer tube outlet 5 Inner tube packer 6 Inner tube outlet 7 Space 8 Pressure transmission member (tube)
DESCRIPTION OF SYMBOLS 9 Drilling hole 10 Packer discharge port 11 One end 12 Pressure detection part 13 Other end 14 Pressure gauge 14a Pressure gauge 19 Rubber sleeve 20 Hand pump 21 Strain resistance type pressure sensor 22 One end 23 Other end 24 Amplifier 25 Pressure display device 26 Signal cable 29 Outer tube packer 30 Outer port packer outlet

Claims (16)

  A ground injection device comprising an outer tube and an inner tube inserted into the outer tube, and injecting a consolidated material into the ground to consolidate the ground, wherein the outer tube has an outer tube discharge port on the surface. The inner tube is provided with a plurality of inner tube packers spaced apart from each other, and has an inner tube discharge port between adjacent inner tube packers, and when inserting the inner tube into the outer tube, In a ground injection device in which an outer tube discharge port is located between adjacent inner tube packers and a space is formed between the inner tube packers in the outer tube, the pressure in the space is sensed. A pressure transmission member that transmits the pressure is installed in the injection device, and the pressure sensed in the space is transmitted to the pressure gauge through the pressure transmission member, and the transmitted pressure is measured to grasp the ground injection pressure. A ground injection device characterized by.   2. The pressure in the space according to claim 1, wherein the pressure transmission member is a tube, and one end is located in the space to sense the pressure in the space, and the other end is connected to a pressure gauge on the ground. The ground injection device according to claim 1, wherein the pressure is measured with a pressure gauge.   The ground injection device according to claim 2, wherein the tube is installed through an inner tube.   The ground injection device according to claim 2, wherein one end of a tube located in the space is covered with a film.   The ground injection device according to claim 4, wherein the tube is filled with a liquid, and the pressure in the space sensed by the film is measured with a pressure gauge through the liquid.   The ground injection device according to claim 1, wherein the inner pipe discharge port is an injection port.   A ground injection device comprising an outer tube and an inner tube inserted into the outer tube, injecting a caking material into the ground to consolidate the ground, wherein the outer tube is located at a different position in the axial direction. A plurality of outer pipe outlets, the inner pipe having a plurality of inner pipe packers spaced from each other, and having an inner pipe outlet between adjacent inner pipe packers; When inserting a tube, in the ground injection device in which the outer tube discharge port is positioned between adjacent inner tube packers so that a space is formed between the inner tube packers in the outer tube. A strain resistance pressure sensor disposed in the amplifier, an amplifier connected to the strain resistance pressure sensor via a signal cable, and a pressure display device on the ground connected to the amplifier via a signal cable. Install the pressure transmission member in the ground injection device, Force sensor senses the pressure in the space, through an amplifier the sensed space pressure, and transmitted as an electrical signal to the pressure display unit through a signal cable, ground injection apparatus characterized by grasping the ground injection pressure.   A ground injection device comprising an outer tube and an inner tube inserted into the outer tube, injecting a caking material into the ground to consolidate the ground, wherein the outer tube is located at a different position in the axial direction. A plurality of outer tube discharge ports, the inner tube having a plurality of inner tube packers spaced from each other, and having an inner tube discharge port between adjacent inner tube packers; When inserting a tube, in the ground injection device in which a space is formed between the inner tube packers in the outer tube by inserting the tube so that the outer tube discharge port is located between the adjacent inner tube packers. A pressure transmission member comprising a strain resistance type pressure sensor connected to the pressure sensor, an amplifier connected to the pressure sensor, and a pressure display device on the ground connected to the amplifier via a signal cable. A tube installed in the injection device and located in the space. One end of the probe senses the pressure in the space, the sensed pressure measured is transmitted to a pressure display device via the pressure sensor and the amplifier, ground injection apparatus characterized by grasping the ground injection pressure.   9. The ground injection device according to claim 8, wherein the strain resistance type pressure sensor connected to the amplifier is disposed at the distal end of the inner tube.   In a ground injection method for injecting a caking material into the ground to consolidate the ground, an outer pipe having a plurality of outer pipe discharge ports at different positions in the axial direction, and a plurality of inner pipes inserted into the outer pipe When inserting the inner pipe into the outer pipe by using a ground injection device comprising an inner pipe having an inner pipe discharge port between the inner pipe packers adjacent to each other and having packers spaced apart from each other, The outer tube discharge port is positioned between the tube packers and the space is formed between the inner tube packers in the outer tube, and the pressure in the space is sensed and transmitted to the injection device. A ground injection construction method characterized in that a pressure transmission member is installed, the pressure sensed in the space is transmitted and measured through the pressure transmission member, and the injection pressure of the ground is grasped.   11. The pressure in the space according to claim 10, wherein the pressure transmission member is a tube, and one end is located in the space to sense the pressure in the space and the other end is connected to a pressure gauge on the ground. The ground injection construction method according to claim 10, wherein the soil is measured.   The ground injection method according to claim 10, wherein the tube is installed through an inner tube.   11. The ground injection method according to claim 10, wherein one end of a tube located in the space is covered with a film.   The ground injection method according to claim 13, wherein the tube is filled with a liquid, and the pressure in the space sensed by the film is measured with a pressure gauge through the liquid.   The signal cable according to claim 10, wherein the pressure transmission member is a strain resistance type pressure sensor located in the space, and one end is connected to the pressure sensor via an amplifier, and the other end is connected to a pressure display device on the ground. The pressure sensor senses the pressure in the space, and the sensed pressure in the space is transmitted to the pressure display device as an electrical signal through the signal cable through the amplifier, and the injection pressure of the ground is grasped. Item 10. The ground injection method according to Item 10. The ground injection method according to claim 10, wherein the inner pipe discharge port is an injection port.