JP2000027171A - Grouting method and grouting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly and continuously convey grout such as fine grain suspension or mortar, etc., without blocking the grout into a conveying pipe line and to make it possible to mechanically generate specific microseism pressure without requiring complicated control, in the case microseism components are applied to grouting pressure to dynamically grout, in grouting for injecting the grout into cracks or gaps in ground, bedrock, etc. SOLUTION: In such a process as grout having standard grouting pressure is continuously conveyed in a conveying pipe line 4, a pipe line having flexibility always returned in the open direction with restoring force in the conveying pipe line 4 is provided. Pressure variation coinciding with specific frequency by operation of a valve mechanism for opening and closing a flexible pipe line with regular pushing motions can be applied to the grouting pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grouting technique for injecting a so-called grout material into a crack or a void in a ground or a bedrock, and more particularly to a grouting technique in which a pulsating component is added to an injection pressure to dynamically inject the material. The present invention relates to a grouting method and a grouting system.

[0002]

2. Description of the Related Art In recent years, storage systems utilizing underground rock cavities, such as underground storage of petroleum and LPG and geological disposal of radioactive waste, have attracted attention. Here, it is important to ensure the sealing and stability of the rock cavities.In order to control the advection of groundwater in the slack area of the surrounding rock and to strengthen the rock, it is necessary to improve the performance of grouting technology for cracked rock. I'm in a hurry. On the other hand, due to the lack of suitable dam sites, dam construction has been promoted in places where highly permeable rock masses are widely present and where the ground is composed of gravel layers and unconsolidated layers. Grouting technology that is superior in water stopping and stabilization is required as basic treatment of dam sites and measures against water leakage and seepage. Accordingly, the present applicants have previously filed Japanese Patent Application No. Hei 8-253753 to address the above-mentioned request.
(Hereinafter referred to as prior invention). This technology targets a specific frequency selected from a frequency of 30 Hz or less (particularly, 10 Hz) for cracks and voids in the ground including rock.
This is a grouting method that dynamically injects grout material to increase its permeability by forming a pulsation with an injection pressure (appropriate near) to the injection pressure. The pulsation pressure generator is driven and controlled by a hydraulic servo actuator. A pulsating pressure generating pump of the volume type is used. This construction method is also effective as a method for filling and repairing a cracked concrete structure. The effect of the dynamic injection in the prior invention, that is, the improvement of the permeability of the grout material and the effect of eliminating the clogging by the pulsating pressure have been verified by various tests using a high-concentration fine grout material using bentonite or ultrafine cement. However, the same effect is exhibited with a mortar grout material mixed with coarse particles.

[0003] However, when the above-mentioned invention is applied to actual construction, there are the following problems. (i) In the prior invention, a check valve or a solenoid valve is used as a means for suppressing the pulsating pressure generated by the pulsating pressure generating pump from propagating to the upstream side. Blockage trouble and biting are likely to occur. Further, labor is required for cleaning and maintenance of the grout passage of the check valve / solenoid valve. (ii) In the positive displacement type (piston type in the embodiment) pulsating pressure generating pump disclosed in the prior invention, since the area of the passage in the piston portion greatly changes in multiple stages, when mortar material is used, material separation is required. Blockage trouble easily occurs. Further, labor is required for cleaning and maintenance of the pump. (iii) In the prior invention, a pulsating pressure of a predetermined frequency is formed by performing feedback control of the hydraulic servo actuator of the pulsating pressure generating pump using a special servo control device. However, the operation of the servo controller requires delicate tuning, and the servo controller is re-adjusted every time the average injection pressure, the frequency and amplitude of the pulsating pressure, the type and composition of the grout material are changed (the span of the comparison signal). , Feedback amount, gain, zero point, etc.). Therefore, in order to widely apply the prior invention to various sites as a general-purpose method, a pulsating pressure generating mechanism having excellent operability and mobility that can mechanically generate a desired pulsating pressure without using complicated control. The development of is desired.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made to further develop the prior invention and to solve the above-mentioned problems. Excellent versatility, operability, and maneuverability that can smoothly and continuously pump various grout materials without clogging in the pressure feed piping line, and can generate a predetermined pulsating pressure mechanically without complicated control An object of the present invention is to provide a grouting technique, that is, a grouting method, a grouting system, and a grouting apparatus. For this reason,
In the present invention, a pulsation generating valve having a simple mechanism and structure is introduced instead of the positive displacement type hydraulic servo control type pulsating pressure generating pump, and the flow of grout material pumped at a quasi-stationary reference pressure from the injection pump. By opening and closing regularly with a pulsation generating valve installed as a part of the pressure piping line on the downstream side, by adopting the basic technical idea of giving a pressure fluctuation corresponding to the selected frequency to the injection pressure The object of the present invention has been achieved. The pulsation generation valve has a valve mechanism that opens and closes a flexible pipeline such as a hose by mechanically rotating or reciprocating it at high speed and regularly.
There is no narrow portion or valve body that causes blockage inside the valve, there is no movable portion or seal portion, and when the valve is open, it has a passage similar to the pipe line diameter. By the development and introduction of the pulsation generating valve, the pulsation propagation suppressing means of the check valve in the prior invention can be eliminated.

[0005]

The grouting method according to the present invention is directed to a grouting method for filling a grout material into cracks or voids in the ground, rock or the like, with a specific pressure selected from a frequency range of 30 Hz or less at an injection pressure. By adding a pulsating pressure component with a frequency, the grouting material is dynamically injected to increase the permeability of the grouting material. Is a method of forming a predetermined pulsating pressure in the process of continuously pumping in a pressure feed pipe line, wherein a flexible pipe line that always returns in the opening direction with a restoring force is interposed in the pressure feed pipe line. Further, a pressure fluctuation matching the specific frequency is applied to the injection pressure by operating a valve mechanism that opens and closes the flexible conduit by a regular pressing movement. In the above configuration, a frequency of the pulsating pressure is set at around 10 Hz, a valve mechanism for regularly opening and closing the flexible conduit by mechanically rotating or reciprocating the valve is used, or other The use of a operative valve mechanism is an option. A specific example of the pulsation generating valve applied in the present construction method will be described in the following embodiment, but this is merely an example, and does not exclude a valve mechanism that exhibits the same operation and function. In the grouting system of the present invention, in grouting for filling the grout material into cracks and voids in the ground, rock, etc., a pulsating pressure component having a specific frequency selected from a frequency range of 30 Hz or less is added to the injection pressure. In this construction system, the grout material is dynamically injected to increase its permeability, and a reciprocating or squeeze-type slurry injection pump is mainly used to form a quasi-steady injection pressure. A grout material feeding means for continuously feeding the grout material while maintaining the pressure; and a pressure feeding piping line downstream of the grout material feeding means, having a wide passage, no valve element and no obstruction, and obstruction of the blockage trouble. Using a valve mechanism that opens and closes a flexible conduit that does not generate by a regular pressing motion, the valve mechanism is opened and closed at a high speed, and pressure fluctuation matching the specific frequency is performed. A pulsation pressure generating means for applying the injection pressure; and characterized in that it comprises at least; and pressure measuring means for detecting the pressure that is formed by the grout pumping means and the pulsating pressure generating means. In the above configuration, a frequency of the pulsating pressure is set at around 10 Hz, a valve mechanism for regularly opening and closing the flexible conduit by mechanically rotating or reciprocating the valve is used, or other The use of a operative valve mechanism is an option. Specific examples of the pulsation generating valve applied in the present construction system will be described in the following embodiment, but this is one example,
It does not exclude a valve mechanism that exhibits the same operation and function. The pulsating pressure generating means in the grouting system constitutes another invention of the present invention.

(Operation) In a grouting technique in which a grout material is dynamically injected by giving a pulsation of 30 Hz or less to the injection pressure for a ground or a bedrock, a reference pressure for quasi-stationary injection is formed using an injection pump. While maintaining, grout material is pumped into the pressure feed piping line. Then, a pulsation generating valve that opens and closes regularly by mechanical rotation or reciprocating operation is installed in the middle of the pressure feed pipe line, and the pulsation generating valve is opened and closed at a high speed to reduce a pressure fluctuation corresponding to a specific frequency of 30 Hz or less. And grout is injected dynamically from the injection tube. Here, the pulsation generating valve does not have a narrow portion or a valve body therein, and further does not have a movable portion or a seal portion, and when opened, forms a passage approximate to the pipe line diameter. Thereby, fine grout material and mortar material can be smoothly and continuously pumped without being blocked in the pressure feeding piping line. Further, cleaning and maintenance of the construction system are significantly reduced. Further, since the pulsation generating valve does not require complicated operation and control, it is possible to quickly respond to changes in materials and injection conditions. Then, since the grout material is excited by the pulsating pressure and the fluidity is greatly improved, the grout material permeates widely and deeply into the interior of the injection target.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a grouting method and a grouting system according to the present invention will be described with reference to the drawings. 1 to 6 show an embodiment of a construction system according to the present invention. That is, FIG. 1 shows a system configuration of the present embodiment, FIGS. 2 to 4 show a pulsation generating valve as pulsating pressure generating means, and FIGS. 5 and 6 show a partial configuration thereof.

Referring to FIG. 1, the construction and operation of a grouting system according to an embodiment of the present invention will be described below. The construction system S includes a grout material pumping section 1, a pulsating pressure generating section 2, an injection section 3, and a pumping pipe line 4 connecting these. The flow of the system S will be described from the flow of the grout material. First, in the grout material pumping section, the grout material stored in the tank is suctioned and pressurized by an injection pump, and is continuously sent out to a pressure feed pipe line. At this time, the pressure of the pressure feed pipe line is detected, and the injection pump is controlled so that this pressure substantially maintains a predetermined installation value. In addition, the flow rate of the grout material flowing through the pressure feed pipe line is detected and monitored by a flow meter. The grout material pumped from the grout material pumping section is fed into the pulsating pressure generating section, and 30 Hz using the pulsating valve.
The following selected frequency pulsations are provided: And
The grout material is dynamically injected into a space such as the ground or rock at the injection portion. The pulsation pressure is detected by a pressure sensor disposed at a suitable position (preferably near the inlet of the injection section) between the pulsation pressure generation section and the injection section, and the grout is adjusted so as to match the target injection pressure condition. The operation of the injection pump of the material pumping section and the pulsation generating valve of the pulsating pressure generating section are adjusted. Here, depending on the crack properties of the injection target, it is also assumed that the injection pressure does not rise to the target pressure value at the beginning of the injection, but in this case, the flow rate of the grout material is controlled to a predetermined value until the pressure rises. .

Hereinafter, the detailed structure of each part of the construction system S will be described. Grout material pumping section 1 Grout material pumping section 1 includes grout material storage tank 10, infusion pump 11, pressure sensor 12, pressure gauge 13, flow sensor 1
4 and the main components of the flow meter 15 and the controller 16. In addition, 17 is a water tank. More specifically, first, the grout material manufactured by a kneading device (not shown) is stored in the grout material storage tank 10 while being stirred by a stirrer. Then, the grout material is sucked and pressurized by the infusion pump 11 and sent out to the pressure feeding piping line 4 (4a).
At this time, the pressure of the pressure feed pipe line 4 is detected by the pressure sensor 12 and the pressure gauge 13, and the operation of the infusion pump 11 is automatically controlled via the controller 16 so that the pressure substantially maintains the set value. Thus, the grout material pumping unit 1
Has a function of forming a base quasi-stationary reference pressure and continuously feeding a material when pulsation is applied in the pulsation pressure generation unit 2 in the subsequent stage. Here, the flow sensor 14 and the flow meter 15 are used for monitoring and managing the injection amount and determining the injection completion stage. A general-purpose slurry pump of a reciprocating type or a squeeze type (also referred to as a tube type) is used as the injection pump 11, but a squeeze type is preferable as a type widely applicable to a fine-grain type or mortar type grout material. In these infusion pumps, generally low frequency pulsating components appear at the infusion pressure. Normally, the pulsation of the infusion pump does not cause a problem because the frequency is low and the amplitude is small as compared with the pulsation given by the pulsation pressure generating unit.However, preferably, an air chamber is installed at the latter stage of the infusion pump to minimize the infusion pressure. The method of smoothing is effective. In the above description, the discharge pressure of the infusion pump 11 is automatically controlled by using the controller 16. However, the infusion pump 11 can be manually controlled in accordance with the display of the pressure gauge 13. Furthermore,
In a method in which a bypass valve is provided in the pressure feed pipe line 4 downstream of the injection pump 11 and a part of the grout material is returned to the grout material storage tank 10, the pressure can be controlled by adjusting the opening of the bypass valve. is there.

[0010] pulsating pressure generator 2 pulsating pressure generating portion 2 are central to the present construction system, the pulsation generating valve 20, the pressure sensor 21 and pressure gauge 22
It is composed of The pulsation generating valve 20 has a valve function of opening and closing the flow path by mechanical rotation operation and reciprocating operation, and by regularly blocking the flow of the grout material pumped at a substantially constant pressure from the grout material pumping unit 1, Pressure fluctuations (pulsations) having a selected frequency of 30 Hz or less and an appropriate amplitude are applied to the grout material. With respect to the frequency of the pulsation, a drive mechanism that can arbitrarily select from a frequency range up to 30 Hz with a variable opening / closing cycle of the pulsation generating valve is used, or a drive mechanism fixed around 10 Hz, which is recommended as an optimum frequency, is employed. On the other hand, the amplitude of the pulsation is set to a desired value by adjusting the operation stroke and the opening / closing force of the opening / closing mechanism in the pulsation generating valve.

[0011] to explain the specific mechanism and structure of the pulsation generation valve 20 below the pulsation generation valve 20. 2 to 4 show the overall configuration of one example of the pulsation generating valve 20, and FIGS. 5 and 6 show the main part thereof. The pulsation generating valve 20 is configured by connecting a pressure-resistant hose 26 arranged on a base 25 to
A triple valve unit 27 (27) also installed on the base 25
A, 27B, 27C) are associated with each other so as to synchronously and synchronously press the pressure-resistant hose 26. Hose 2
For 6, a hose guide plate 29 is placed on three pressing adjustment jacks 30 installed on the base 25, and implanted on the base 25 in holes formed at four corners thereof. The inserted support column 31 is inserted, and a spring 32 is interposed between the head of the support column 31 and the hose guide plate 29. The three pressing adjustment jacks 30 finely move up and down in synchronization with each other, and the spring 32 presses and fixes the hose guide plate 29. The hose 26 is made of an elastic, pressure-resistant and durable material (for example, made of rubber) and has flexibility. Then, in a natural state and in a non-compressed state, a circular open cross section is maintained, and the open cross section is reduced by receiving an external force. A nipple 33 connected to the piping line 4 is attached to both ends thereof,
It is placed in the longitudinal direction of the hose guide plate 29 and is fixed by hose stops 34 fixed to both ends of the hose guide plate 29. Reference numeral 35 denotes a hose damper. The valve part 27 is provided with first, second, and third valve parts 27A, 2
7B and 27C are installed straddling the hose 26. Each valve portion 27A, 27B, 27C has the same structure. Valve 27
The rotary shaft 37 is rotatably supported by a bearing 38, and cam plates 39 are fixedly provided on both sides of a central portion 37a, and a roller 40 is rotatably pivotally mounted on the tip of the cam plate 39. The hose guide 41 is attached to the central portion 37a. More specifically, the bearings 38 are fixed to the base 25 on both sides of the hose guide plate 29 and erected. The central portion 37a is fixed to the rotation shaft 37 so as to rotate integrally with the rotation shaft 37, and cam plates 39 are fixed to both sides thereof. The cam plate 39 has a substantially rhombic or elliptical planar shape.
0 is rotatably mounted. Hose guide 41 is 2
A pair is formed at a plurality of places (four places in the present embodiment) at appropriate intervals in the central portion 37a. The hose 26 is loosely inserted between the two hose guides 41. The valve unit 27 is rotated by transmitting a rotational driving force to the rotating shaft 37 from the rotational driving mechanism. The rotation drive mechanism includes a rotation motor 43 installed on the base 25 and a rotation shaft 44 of the rotation motor 43.
The rotation shafts 37A, 3 of each valve portion 27A, 27B, 27C
Drive belt 45 (4
5A, 45B, 45C).

Regarding the operation of the pulsation generating valve 20, the rotational force of the rotary motor 43 of the rotary drive mechanism
5A, 45B and 45C, each rotating shaft 37 of the valve portion 27
A, 37B, 37C, and each valve part 27A, 27
B and 27C are rotated synchronously. Due to the rotation of the valve portion 27, the roller 40 comes in contact with the hose 26 as it goes downward, and presses the hose 26 at its lowest point, and then separates from the hose 26. By moving the pressing adjustment jack 30 up and down, the hose 4 and the roller 4 of the valve portion 27 are moved.
By adjusting the interval with zero, the force applied to the hose 26 is adjusted. Instead of the pressure adjusting jack 30, a liner plate of various thicknesses is interposed between the hose guide plate 29 and the base 25 and bolted to each other to adjust the separation between the hose 26 and the roller 40. It is also effective to do so.

The pulsation generating valve 20 will be described in more detail below. This pulsation generating valve 20 is a valve that regularly opens and closes a flexible pipeline such as a hose by mechanical rotation or reciprocation, assuming wide applicability to fine grout material or mortar material. It has a mechanism, has no valve element or obstruction that causes blockage inside the valve, has no movable part or seal part, and has a passage similar to the pipe line diameter when the valve is open. The illustrated example is an embodiment in which a pressure-resistant hose and a plurality of valve units that are opened and closed by a rotation operation are combined, and high-speed opening and closing required as a pulsation generating valve can be performed. Here, the grout material is pressure-fed through the passage in the pressure-resistant hose, and the peak value of the pulsating pressure shows a value close to the pressure of the upstream pressure piping line.
The main structure of the opening / closing mechanism is a combination of a cam and a roller.The rotational driving force of the motor is transmitted to the cam via a drive belt, and with the rotation of the cam, the pressure-resistant hose is pressed by the roller arranged at the end, and the inside of the hose is pressed. Narrow and block the passage. A plurality of valve portions are arranged in series on one passage, and these are synchronized and sequentially pressed against a pressure-resistant hose.
By arranging a plurality of valve parts in this way, the durability of the pressing part of the pressure-resistant hose is greatly improved,
High frequency open / close performance can be obtained for the entire valve. The pressure-resistant hose expands and recovers due to the internal pressure and elasticity when the roller is detached, but the illustrated hose guide also serves as a guide for shape recovery. The frequency of the pulsation is determined by the number of valves installed, the number of rollers, and the number of rotations of the cam. Here, the pulsation frequency is 10Hz
In the vicinity, three valve units and two rollers for each valve unit are appropriate. When the frequency of the pulsation is arbitrarily adjusted within 30 Hz according to the injection condition, the rotation speed of the drive motor is variably controlled. On the other hand, the pulsating pressure waveform (amplitude and wave width) of the roller pressing force and the passage blocking time when the roller is pressed
In order to determine the value, the factors related to these factors, that is, the radius of the cam and the diameter of the roller, must be set so as to obtain a required pressure waveform. The waveform of the pulsating pressure, particularly the pressure amplitude, changes depending on the rotation direction of the cam, that is, whether the roller moves toward the upstream side of the pipe line or the roller moves toward the downstream side. Further, fine adjustment of the receiving plate of the pressure-resistant hose up and down with the illustrated jack or the like is also effective for tuning the pressure waveform. Further, in the present embodiment, the pulsation pressure is formed by turning on / off the pressure flow of the grout material, so that the means for suppressing the propagation of the pulsation pressure to the upstream side, which is required in the prior invention, can be eliminated. In addition, this pulsation generation valve is used for dynamic injection of the particle suspension grout material, but does not exclude the use of the solution suspension grout material.

Injection part 3 Returning to FIG. 1 again, although the constitution of the injection part 3 is not specifically shown, in the case of injection for general cracked rock, the injection hole and the injection hole formed in the rock are formed. An injection tube to be inserted, a packer or the like that restricts an injection area in close contact with the hole wall, and grout material pumped through the pulsation generating valve 20 is used.
It is for dynamically injecting and infiltrating rock cracks under pulsating pressure.

As described above, according to the grouting system according to the embodiment of the present invention, there is no obstacle or a large cross section change in the path of the grout material, and the mortar material as well as the fine-grain grout material does not block in the system. Continuous and smooth pumping is possible. In addition, by using a pulsation generating valve that mechanically generates a predetermined pulsating pressure without using complicated control, a grouting system by dynamic injection excellent in versatility, operability, and mobility can be constructed. . Further, the means for suppressing the propagation of the pulsating pressure causing the blockage to the upstream side can be eliminated.

FIGS. 7 and 8 show another embodiment of the pulsation generating valve. In the figure, the same reference numerals are given to members equivalent to those in the above embodiment. The pulsation generation valve 20A of this embodiment has the same basic structure as the pulsation generation valve 20 and is based on a combination of a pressure-resistant hose and a plurality of valve mechanisms by reciprocating operation. That is, the pulsation generation valve 20A
A series of valve portions 47 (47A, 47B, 47C) are provided, and each of the valve portions 47A, 47B, 47C is a rotating cam portion 4.
8 and the plunger part 4 which moves up and down in conjunction with the cam part 48
9 and a support wall 50 that supports the rotation shaft of the cam portion 48 and the guide cylinder of the plunger portion 49.

The support wall 50 is erected on the base 25, and rotatably supports a rotating shaft 52 disposed through the support wall 50. A cam 48 is attached to the front of the rotating shaft 52. A guide cylinder 53 of a plunger portion 49 is further fixed to the support wall 50 via an arm 53a. The plunger portion 49 includes a mandrel 49a which is inserted into the guide cylinder 53 so as to be vertically movable, and a fork 4 attached to the upper end of the mandrel 49a.
Roller 49 pivotally attached to 9b via a rotation shaft
c, a compression spring 49d interposed between the fork 49b and the guide cylinder 53, and a stepping shoe portion 49e at the lower end of the mandrel 49a. The roller 49c at the upper end of the plunger portion 49 receives the urging force of the compression spring 49d and constantly contacts the outer peripheral surface thereof to the cam surface of the cam portion 48. A sprocket (or toothed pulley) 54 is attached to the rear part of the rotating shaft 52, and a chain (or toothed) wound around a sprocket (or toothed pulley) 55 attached to the rotating shaft 44 of the rotating motor 43. The rotation of the rotary motor 43 is transmitted to the cam portion 48 with the attached belt 56.

Regarding the operation of the pulsation generating valve 20A,
The rotational force of the rotary motor 43 of the rotary drive mechanism is transmitted through a sprocket 55, a chain 56, and a sprocket 54 (or a toothed pulley, a toothed belt, and a toothed pulley) to a valve portion 47.
Are rotated. The cam portion 48 rotates together with the rotating shaft 52, and the mandrel 49a of the plunger portion 49 interlocked with the cam portion 48 moves up and down.

The pulsation generating valve 20A of this embodiment will be described in more detail. In this embodiment, a method is used in which the rotational motion of the cam is not directly used as the opening / closing force of the valve, but converted into reciprocating motion of the plunger via a roller, and the pressure-resistant hose is pressed at the tip of the plunger to open and close the passage. are doing. Here, the guide cylinder is for guiding the sliding operation of the plunger, and the coil spring is for applying a restoring force to the plunger. The pulsation frequency is determined by the pulsation generation valve 2
As in the case of 0, the number of installed valve units, the shape of the cam, and the number of rotations can be determined. The pulsating pressure waveform is determined by the operating stroke of the plunger determined by the shape of the cam, the separation between the tip of the plunger and the hose, and the like. Here, a method of directly operating the plunger using a crankshaft instead of the cam and the roller, or using an actuator such as hydraulic pressure or pneumatic pressure is also possible in the embodiment. By using the valve mechanism according to the present embodiment, the opening / closing operation can be performed at a higher speed as compared with the pulsation generating valve 20 of the previous embodiment, and since the side surface of the pressure-resistant hose is linearly pressed, the pressure-resistant hose Durability is further increased. If attention is paid only to the mechanism for holding and opening the hose, a pinch valve mechanism is similar to the pulsation generation valve 20A of this embodiment. However, in the pinch valve, it takes ten and several seconds to open and close the valve stem by rotating the valve stem with a screw, and it is difficult to achieve high-speed and high-frequency opening and closing even if a large number of the pinch valves are installed.

The present invention is not limited to the above embodiment, and various design changes can be made within the scope of the basic technical concept of the present invention. That is, the following embodiments belong to the technical scope of the present invention. Although the hose guide plate 29 is provided in the present embodiment, the hose guide plate 29 may be omitted, and the hose 26 may be disposed directly on the base 25. In the present embodiment, the hose 26 having a predetermined length is used. However, a pipe made of a flexible material may be used only for a portion that comes into contact with the valve portion and is opened and closed.

[0021]

According to the present invention, there is no obstacle or a large cross section change in the path of the grout material, so that not only the fine grout material but also the mortar material can be smoothly and continuously pumped without being blocked in the system. . In addition, by using a pulsation generating valve that mechanically generates a predetermined pulsating pressure without using complicated control, a grouting system by dynamic injection excellent in versatility, operability, and mobility can be constructed. . Further, the means for suppressing the propagation of the pulsating pressure causing the blockage to the upstream side can be eliminated.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a grouting system according to an embodiment for implementing a grouting method according to the present invention.

FIG. 2 is a plan view showing the mechanism and structure of a pulsation generating valve serving as pulsating pressure generating means of the present invention.

FIG. 3 is a front view of FIG. 2 (a view in the direction of arrows in FIG. 2);

FIG. 4 is a sectional view taken along line 4-4 of FIGS. 2 and 3;

FIG. 5 is a side view of the pulsation generation valve.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

FIG. 7 is a front view showing another embodiment of the pulsation generating valve serving as the pulsating pressure generating means of the present invention.

FIG. 8 is a sectional view taken along line 8-8 in FIG. 7;

[Explanation of symbols]

S ... grouting system, 1 ... grout pumping section, 2 ...
Pulsating pressure generating section, 3 ... Injection section, 4 ... Pressurized piping line, 1
1 ... Infusion pump, 20, 20A ... Pulse generation valve, 26 ... Pressure resistant hose, 27 (27A, 27B, 27C), 47 (4
7A, 47B, 47C) ... valve

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hijiharu 4-55, Kobana-ku, Osaka-shi, Osaka Prefecture Konoike Gumi Co., Ltd. (72) Inventor Joji Nishihama 4-3-55, Konohana-ku, Osaka-shi, Osaka No. Konoike Gumi Co., Ltd. (72) Inventor Susumu Yoshii 4-3-55 Kodena-ku, Osaka-shi, Osaka, Japan No. 3 Konoike Gumi Co., Ltd. (72) Inventor Yasutaka Terado 15-17 Sakuragaoka-cho, Shibuya-ku, Tokyo Japan Basic Technology Tokyo Head Office Co., Ltd. (72) Inventor Tohru Takada 15-17 Sakuragaoka-cho, Shibuya-ku, Tokyo Japan Basic Technology Co., Ltd. Tokyo Head Office Co., Ltd. (72) Inventor Makoto Nishigaki 3-1-1 Tsushimanaka, Okayama City, Okayama Prefecture Okayama University Faculty of Environmental Science and Technology F-term (reference) 2D040 AA04 AB01 AC01 AC03 BA00 BB01 CA01 CB03 CD03 DA07 DB01 DC02 EA27 FA09

Claims (3)

[Claims] (1) In grouting for filling a grout material into cracks or voids in the ground or rock, etc., the injection pressure is set to 30 Hz.
By adding a pulsating pressure component having a specific frequency selected from the following frequency ranges, the grout material is dynamically injected to increase its permeability. An injection method for forming a predetermined pulsating pressure in the process of continuously pumping various grout materials such as a turbid system or a mortar system in a pressure-feeding pipe line, and always returns to the opening direction with a restoring force in the pressure-feeding pipe line. A flexible pipe line is interposed, and a pressure fluctuation matching the specific frequency is given to the injection pressure by operating a valve mechanism that opens and closes the flexible pipe line by regular pressing movement. Grouting method characterized by the following. 2. A grouting method for filling a grout material into cracks or voids in the ground, rock or the like, with an injection pressure of 30 Hz.
By adding a pulsating pressure component with a specific frequency selected from the following frequency ranges, the grout material is dynamically injected to increase the permeability of the grout material. A grout material pumping means for continuously pumping the grout material while forming and maintaining a quasi-stationary infusion reference pressure; and a pumping pipe line downstream of the grout material pumping means. A valve mechanism that is interposed, has a wide passage, has no valve element or obstruction inside, and has a flexible pipe line that opens and closes by a regular pressing motion without blockage trouble. Pulsating pressure generating means for applying a pressure fluctuation matching the specific frequency to the injection pressure; and a pressure measurement for detecting a pressure formed by the grout material pumping means and the pulsating pressure generating means. And grouting means. 3. A grouting method for filling a grout material into cracks or voids in the ground, rock, or the like, wherein the injection pressure is 30 Hz.
By adding a pulsating pressure component having a specific frequency selected from the following frequency ranges, the grout material is dynamically injected to increase the permeability of the grout material. In the process of continuously pumping various grout materials such as turbid or mortar-based materials through the pressure-feeding pipeline, a flexible pipeline is interposed in the pressure-feeding pipeline, and the flexible pipeline is regularly pressed. A pulsation generating valve device in a grouting system, comprising: a valve mechanism that opens and closes a valve at a high speed by motion to apply a pressure fluctuation matching the specific frequency to an injection pressure.