JP2008231784A - Pulsation generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulsation generating device having a simple mechanism, and easy in maintenance. <P>SOLUTION: In this pulsation generating device, the pulsation generating device for imparting pulsation to an injection material injected into base rock, is composed of a hydraulic pressure generator composed of a hydraulic pump and a pressure control valve for controlling hydraulic pressure delivered from the hydraulic pump; a control device for imparting the pulsation regulated by maximum pressure, minimum pressure, rising time, maximum pressure maintaining time, trailing time and a frequency to the hydraulic pressure by controlling the pressure control valve; and a pulsation generator installed in the middle of an injection material force feed pipe and having a cylindrical elastic body expanding-contracting so that an inner diameter contracts by the pulsation of the hydraulic pressure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pulsation generator used in a dynamic injection system.

  In underground storage facilities and tunnels that store oil and gas, stable shielding over a long period of time is required for the surrounding ground. For this reason, an injecting material is injected into the upper, lower, left, and right and front and back grounds for sealing. An example of the injection material is grout. Grout is a highly fluid liquid that fills gaps in rocks and ground, including cement, clay, and water glass. If the gap is large, sealing is easy, but it takes time to perform the sealing work on rocks with many microcracks and low-permeability ground.

  FIG. 7 is a graph showing the relationship between the injection amount of general injection material into the ground and the injection time. Initially, the injection amount is large, but as the time passes, the injection amount does not increase even if the injection pressure is increased. In sealing, a normal method (indicated by N) in which an injection material is pumped and injected, and a dynamic injection method (indicated by D) in which the injection material is pumped and injected by applying vibration are known. Since the dynamic injection method can improve 10 to 20% compared to the normal method, if a predetermined amount of the injection material is injected, the work period can be shortened accordingly.

  FIG. 8 is a general dynamic injection system configuration diagram. The grout 17 is stirred at high speed in the tank by the mixer 16 and is sent out to the injection material pressure feed pipe 11 by the grout pump 18. The flow rate / pressure detector 19 checks the flow rate and pressure, and the data is sent to the flow rate / pressure management device 20, recorded on the medium and printed. When a predetermined pressure is exceeded by the flow rate / pressure detector 19, the valve opens and a part of the grout is returned to the tank. A pulsation generating device 50 is provided in the middle of the injection material pumping tube 11. The pulsation generator 50 includes the pulsation generator 6 and the control device 2, and applies the pulsation to the grout of the injection material pressure feeding tube 11. The pressure is checked by the pressure sensor 21, and the pulsation is adjusted by the control device 2. The grouting 17a having pulsation is sent to the inside of the excavation hole through the leakage prevention packer 22 provided at the upper part of the excavation hole and injected into the ground.

As a specific example of the pulsation generating device, Patent Document 1 discloses that a T-shaped crossing path is formed in the middle of an injection material feeding pipe, a hydraulically driven cylinder and a piston are provided in a T-shaped leg portion, and a grout is once formed. A mechanism is shown that pulsates the grout by pulling it back into the cylinder and pushing it out again. Patent Document 2 discloses a mechanism that pulsates the grout by pressing an injection material pressure feeding tube formed of flexible rubber or the like with a roller provided on a rotating body. However, the mechanism is complicated and requires a lot of man-hours for maintenance.
Japanese Patent Laid-Open No. 10-114938 Japanese Patent Laid-Open No. 2001-27171

  An object of the present invention is to provide a pulsation generator having a simple mechanism and easy maintenance.

  In order to achieve the above object, the pulsation generator according to the first aspect of the present invention controls the hydraulic pump and the hydraulic pressure discharged from the hydraulic pump. A hydraulic pressure generating device including a pressure control valve, and a control device that controls the pressure control valve to give the hydraulic pressure a pulsation defined by a maximum pressure, a minimum pressure, a rise time, a maximum pressure maintenance time, a fall time, and a frequency. And a pulsation generator having a cylindrical elastic body that is attached in the middle of the injection material pressure-feed pipe and expands and contracts so that the inner diameter is contracted by the pulsation of the hydraulic pressure.

  According to a second aspect of the present invention, in the pulsation generator, a cylindrical piston is brought into contact with the elastic body, a hydraulic chamber is formed between the piston and a case, and is transmitted to the hydraulic chamber. The hydraulic pulsation is converted into a radial expansion / contraction motion that reduces the internal diameter of the elastic body through a reciprocating motion of the piston in the axial direction.

  According to a third aspect of the present invention, in the pulsation generator, a hydraulic chamber is formed between an annular recess provided outside the elastic body and the case, and hydraulic pulsation transmitted to the hydraulic chamber is generated. Further, the elastic body is directly converted into a radially extending and contracting motion that reduces the inner diameter of the elastic body.

  According to a fourth aspect of the present invention, the hydraulic pressure generating device is characterized in that a plurality of the pressure control valves are connected to the hydraulic pump.

  According to the fifth aspect of the present invention, the control device follows the control of giving pulsation to the pulsation generator, and follows the external flow rate and the value of the pressure sensor. And a control for reducing the inner diameter of the elastic body when the pressure is low.

  According to the pulsation generating device of the first aspect of the present invention, the inner diameter is reduced by the pulsation imparted to the hydraulic pressure with respect to the injection material passing through the inside of the cylindrical elastic body embedded inside the case. Since a pulsation generator having an elastic body that can be expanded and contracted is provided, there is no piston mechanism that sucks and pushes the injection material, and there is no rotation mechanism that presses the injection material pressure-feeding tube from the outside.

  According to the second aspect, since the elastic body is compressed in the axial direction by the cylindrical piston connected to the cylindrical elastic body, the elastic body expands and contracts in the radial direction so that the inner diameter is reduced. . Thereby, a pulsation can be efficiently given to an injection material.

  According to the third aspect, the pulsation of the hydraulic pressure transmitted to the annular recess provided outside the elastic body is directly converted into a radial expansion / contraction motion that reduces the inner diameter of the elastic body. Thereby, a pulsation can be efficiently given to an injection material.

  According to the fourth aspect, since the hydraulic pressure generator is provided with a plurality of pressure control valves connected to one hydraulic pump, a plurality of pulsation generators can be connected to the pressure control valve with hydraulic hoses, The sealing work can be performed simultaneously. Two pulsation generators can be connected to one injection material pumping tube.

  According to the fifth aspect, in addition to the pulsation control, the control device follows the external flow rate and the value of the pressure sensor, and if the pressure is high, the inner diameter of the elastic body is expanded, and if the pressure is low, the inner diameter of the elastic body is increased. This pulsation generator can be used in the passage back to the infusate tank.

  Hereinafter, a pulsation generator according to the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of a pulsation generator according to the present invention. A pulsation generator 100 according to the present invention includes a hydraulic pressure generator 1, a control device 2, and a pulsation generator 6. The hydraulic pressure generator 1 and the pulsation generator 6 are connected by a hydraulic hose 5. The hydraulic pressure generator 1 includes an oil tank 13, a hydraulic pump 3, an electric motor 12, and a plurality of pressure control valves 4. When the electric motor 12 rotates, the oil is pumped up from the oil tank 13 by the hydraulic pump 3, reaches a predetermined hydraulic pressure p, and is pumped to the pressure control valve 4. Since a plurality of pressure control valves 4 are connected under one hydraulic pump 3, the discharge pressure of the hydraulic pump 3 is individually controlled according to the number.

  The control device 2 controls the pressure control valve 4 of the hydraulic pressure generator 1 to generate pulsation in the hydraulic pressure. The control device 2 also performs monitoring of the pressure sensor 21 and control of the pressure control valve 4 based on the data of the pressure sensor 21. The pulsating hydraulic pressure leaving the pressure control valve 4 is transmitted to the pulsation generator 6 by the hydraulic hose 5. The pulsation generator 6 is incorporated in the middle of the injection material pumping tube 11. The injection material 7 is pumped to the injection material pumping tube 11. An example of the injection material 7 is grout.

  FIG. 2 is a sectional view showing a first structural example of the pulsation generator according to the present invention. The pulsation generator 6 is provided with a cylindrical case 14, a cylindrical elastic body 8 incorporated in the cylindrical case 14, and a cylindrical piston 9 connected to the elastic body 8. The injection material 7 passes through the elastic body 8 and the piston 9 as a flow path. A hydraulic chamber 10 is formed between the piston 9 and the case 14, and the hydraulic hose 5 is connected to the hydraulic chamber 10, and hydraulic pressure pulsated by the oil 15 is transmitted. When pressure is applied to the hydraulic chamber 10, the piston 9 moves in the right direction (axial direction) in FIG. 2, and the elastic body 8 sandwiched between the case 14 is compressed. When the pressure in the hydraulic chamber 10 decreases, the elastic body 8 returns to its original shape due to elasticity. As a result, the elastic body 8 expands and contracts so that the inner diameter of the elastic body 8 is reduced. A pulsation is imparted to the injection material 7 by the expansion and contraction movement of the elastic body 8 in the radial direction. The elastic body 8 has elasticity, for example, and can be made of rubber having excellent wear resistance and chemical resistance. In addition, when the piston 9 moves to the right side, a support member (not shown) is inserted into the left side of the piston 9 so that the injection material 7 does not enter the gap on the left side of the piston 9. Provided.

  FIG. 3 is a sectional view showing a second structural example of the pulsation generator according to the present invention. The pulsation generator 6 is provided with a cylindrical case 14 and a cylindrical elastic body 8 incorporated in the cylindrical case 14. An annular recess 24 is provided outside the elastic body 8, and the hydraulic chamber 10 is formed between the annular recess 24 and the cylindrical case 14. The injection material 7 has a structure that passes through the elastic body 8 as a flow path. The hydraulic chamber 10 communicates with the hydraulic hose 5, and hydraulic pressure pulsated by the oil 15 is transmitted to the hydraulic chamber 10. When pressure is applied to the hydraulic chamber 10, the inner diameter of the elastic body 8 is reduced, and when the pressure in the hydraulic chamber 10 is weakened, the elastic body 8 returns to its original shape due to elasticity. As a result, the elastic body 8 expands and contracts so that the inner diameter of the elastic body 8 is reduced. A pulsation is imparted to the injection material 7 by the expansion and contraction movement of the elastic body 8 in the radial direction.

  FIG. 4 is a circuit diagram of the pulsation generator having the configuration shown in FIG. The hydraulic pump 3 represents that oil is discharged at a predetermined hydraulic pressure toward the tip of the triangle. As the pressure control valve 4, for example, a three-way two-position electromagnetic valve can be used. The three directions refer to three: an inlet from the hydraulic pump 3, an outlet to the pulsation generator 6, and a return port to the oil tank 13. The two positions are a position s1 where oil from the hydraulic pump 3 flows to the pulsation generator 6 and simultaneously flows to the return port to the oil tank 13, and a position s2 where the oil from the hydraulic pump 3 does not flow anywhere. It points to two. When the electromagnetic valve of the three-way two-position valve is at the position s1, the internal control valve is opened by the opening amount instructed by the control of the control device 2. If there is a pulsation generator 6 that is not used, the corresponding control valve of the pressure control valve 4 is set to the state s2. That is, the maximum pressure and the minimum pressure of the pulsating hydraulic pressure can be determined by the opening amount of the control valve. Since the pressure control valve 4 is a pressure-compensated pressure control valve, the maximum pressure of each of the pressure control valves 4 to be operated can be created without lowering the discharge pressure of the hydraulic pump 3. Moreover, the control valve of each pressure control valve 4 can be changed stepwise in order or simultaneously.

  FIG. 5 is a diagram illustrating a waveform of hydraulic pulsation generated by controlling the pressure control valve 4 with the control device 2. The maximum pressure (Max) and the minimum pressure (Min) can be determined by the amount of opening of the control valve of each pressure control valve 4. Further, the rising time a and the falling time c can be controlled by performing the opening degree of the control valve stepwise or at once. If the opening amount is kept constant, the Max maintenance time b and the Min maintenance time d can be held. For example, if one cycle time f (= a + b + c + d) is 0.1 second, the frequency of pulsation is 10 Hz.

  Since the hydraulic pump 3 has a large discharge pressure, the pulsation hydraulic pressure necessary for generating each pulsation can be obtained even if the pressure is distributed to the plurality of pressure control valves 4. If there are a plurality of pressure control valves 4, a plurality of sealings can be advanced simultaneously, and a plurality of pulsation generators can be mounted on one injection material pressure feeding tube.

  FIG. 6 is a configuration example in which the pulsation generator according to the present invention is applied to a dynamic injection system. As shown in FIG. 6, according to the pulsation generating device 100, pulsation can be given to the grout 17 in which the pulsation generator 6 is connected to the injection material pumping tube 11. Further, the function of the flow rate / pressure management device 20 can be substituted by connecting the pulsation generator 6 to a passage for returning the grout 17 from the injection material feeding pipe 11 to the grout tank 23.

  The pulsation generator of the present invention is suitable as a component of a dynamic injection system that seals the ground.

It is a block diagram of the pulsation generator by this invention. (Example 1) It is the 1st example of composition of the pulsation generator by the present invention, and is the sectional view. It is the 2nd structural example of the pulsation generator by this invention, and is the sectional drawing. It is a circuit diagram of the pulsation generator of the structure shown in FIG. (Example 1) It is a figure which shows the waveform of a hydraulic pulsation. (Example 1) It is the structural example which applied the pulsation generator by this invention to the dynamic injection | pouring system. It is the graph showing the relationship between the injection quantity to the ground of general injection material, and injection | pouring time. It is a general dynamic injection system configuration diagram.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic pressure generator 2 Control apparatus 3 Hydraulic pump 4 Pressure control valve 5 Hydraulic hose 6 Pulsation generator 7 Injection material 8 Elastic body 9 Piston 10 Hydraulic chamber 11 Injection material pressure feed pipe 12 Electric motor 13 Oil tank 14 Case 15 Oil 16 Mixer 17 Grout 17a Grout with pulsation 18 Grout pump 19 Flow rate / pressure detector 20 Flow rate / pressure management device 21 Pressure sensor 22 Packer 23 Grout tank 50 Conventional pulsation generator 100 Pulsation generator Max Maximum pressure Min Minimum pressure a Rise time b Maximum Pressure maintenance time c Fall time d Minimum pressure maintenance time f 1 cycle time

Claims (5)

A pulsation generator that pulsates the injected material injected into the rock,
A hydraulic pressure generator comprising a hydraulic pump and a pressure control valve for controlling the hydraulic pressure discharged from the hydraulic pump;
A control device that controls the pressure control valve to give the hydraulic pressure a pulsation defined by a maximum pressure, a minimum pressure, a rise time, a maximum pressure maintenance time, a fall time, and a frequency;
A pulsation generator comprising: a pulsation generator having a cylindrical elastic body that is attached in the middle of an injection material pressure feed pipe and expands and contracts so that an inner diameter thereof is contracted by the pulsation of the hydraulic pressure.   In the pulsation generator, a cylindrical piston is brought into contact with the elastic body, a hydraulic chamber is formed between the piston and the case, and the hydraulic pulsation transmitted to the hydraulic chamber is a shaft of the piston. The pulsation generator according to claim 1, wherein the pulsation generator is converted into a radially extending / contracting motion that contracts an inside diameter of the elastic body through a reciprocating motion in a direction.   In the pulsation generator, a hydraulic chamber is formed between an annular recess provided outside the elastic body and a case, and the hydraulic pulsation transmitted to the hydraulic chamber reduces the inner diameter of the elastic body. The pulsation generating device according to claim 1, wherein the pulsation generating device is directly converted into a stretching motion in a direction.   The pulsation generator according to claim 1, wherein a plurality of the pressure control valves are connected to the hydraulic pump.   In addition to the control for imparting pulsation to the pulsation generator, the control device follows the external flow rate and the value of the pressure sensor and expands the inner diameter of the elastic body when the pressure is high, and the elasticity when the pressure is low. The pulsation generator according to claim 1, further comprising a control for reducing the inner diameter of the body.

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