JP6894800B2 - Injection method and vibration addition device used for it - Google Patents

Description

The present invention relates to an injection method. More specifically, the present invention is for injecting a cement-based injection material into a bedrock crack or infiltrating an injection material into the ground in curtain grouting, consolidation grouting, etc. performed in dam construction, mountain tunnel construction, etc. , The present invention relates to a dynamic injection method of applying dynamic pressure to an injection material.

For rock grouting such as tunnels (for example, mountain tunnels) and dams where a large water pressure acts, cement milk, which is a cement-based injection liquid having high strength after solidification and excellent long-term durability, is often used.
This cement milk is a suspension in which cement particles having a size of several μm to several tens of μm are dispersed in water. When cement milk is injected into a rock crevice, the cement particles may solidify into a cross-linked shape at a narrowed portion (bottleneck) in the rock crevice, forming a so-called “bridge”. Such a bridge is a clogging phenomenon of cement particles and is formed by sedimentation of cement particles. Then, once the bridge is formed, it becomes difficult to inject more cement milk.
On the other hand, if a turbulent flow is generated in the flow of cement milk injected into the ground, the formation of such a bridge can be prevented. If the flow of cement milk is turbulent, bridges due to cement particles are not formed at the narrowed portion of the rock crack, and the cement milk can easily pass through the crack (narrowed portion) of the rock.

In order to prevent the formation of the bridge as described above, the applicant first injects the injection liquid into the ground G via the injection liquid supply system L2, the return valve 3, and the injection side system (injection bedrock side system L3). In the injection method for injection, we propose a technique for adjusting the opening degree of the injection side discharge port 32 and the return side discharge port 33 of the return valve 3 to control the injection pressure of the grout material supplied to the injection side L3 in a wavy shape. (See Patent Document 1).
Although such a technique (Patent Document 1) is very useful, it is recommended to provide a return valve and use it in a double-pass circulation system in which excess cement milk that is not injected into the ground is returned from the return valve to the grout mixer via the return line. It is assumed. Therefore, it is difficult to apply it in a single-way circulation in which the entire amount of cement milk supplied from the grout mixer is injected into the ground without providing a return valve.
In addition, there is a risk that the control mechanism of the return valve will be complicated.

As another conventional technique, for example, a technique of vibrating the injection hose in the axial direction (the pipe axial direction of the hose) to give pulsation to the cement-based hardened material in the hose has been proposed (see Patent Document 2).
However, simply giving pulsation to the solidifying material in the hose is not sufficient to prevent the formation of a bridge. In order to prevent bridging and allow the solidifying material to sufficiently penetrate into the construction ground, it is desirable to add vibrations with various waveforms, amplitudes, and frequencies to the solidifying material in response to the construction ground. It is difficult to meet such a request by the above technique (Patent Document 2) in which the hose vibrates only in the axial direction (the pipe axial direction of the hose).

Japanese Patent No. 6037389 Japanese Patent No. 4395062

The present invention has been proposed in view of the above-mentioned problems of the prior art, and can be applied to single-road circulation without complicating the configuration of the equipment, and has various waveforms and amplitudes corresponding to the construction ground. It is an object of the present invention to provide an injection method capable of applying vibration having a frequency to a solidifying material in a hose and a vibration adding device used for the injection method.

In the injection method of the present invention, the injection liquid (for example, cement milk, grout material) is passed through the injection liquid supply system (100: grout mixer 1, grout pump 2, injection device 10, injection pipe or injection hose H connecting them). ) Injecting into the ground (G)
A vibration addition device (3) interposed in the injection liquid supply system (100) and arranged in the vicinity of the injection device (10: or an injection port for injecting grout material into the ground) is provided.
The vibration addition device (3) has a support member (3A: hose support) for supporting (grasping) the injection pipe (H: injection hose) through which the injection liquid flows, and a length of the injection pipe (H) for supporting (3A) the support member (3A). It has a moving device (3B) that moves in a direction perpendicular to the direction (the pipe axis direction of the injection hose H), and the moving device (3B) is the longitudinal direction of the injection pipe (H) (the pipe axis of the injection hose H). A track portion (3BA: rail) extending in a direction perpendicular to the direction) is provided.
The support member (3A) supporting the injection pipe (H) reciprocates in the track portion (3BA), so that the support member (3A) is perpendicular to the longitudinal direction of the injection pipe (H: injection hose) (the pipe axis direction of the injection hose H). It has a step of adjusting the waveform, frequency, and amplitude of the injection pressure of the injection liquid by swinging the injection pipe (H) in the direction to add vibration to the injection liquid.
In the process of adjusting the waveform, frequency, and amplitude of the injection pressure, the injection liquid is injected without resistance and the flow rate (flow rate of the grout pump 2) in the injection liquid supply system is fixed at the maximum flow rate (rated value: for example, 20 L / min). It is not executed in a state where it can be controlled, but is characterized in that it is executed after the injection pressure rises and reaches a predetermined value (first threshold value Pc) .
In the present invention, when the injection pressure of the injection liquid becomes larger than the limit pressure (second threshold value Pd) at which the ground is not destroyed, vibration is not applied to the injection liquid and the injection pressure of the injection liquid is not applied. It is preferable not to adjust the waveform, frequency, and amplitude of.

The mobile device used in grouting of the present invention (3B) includes a slider (3BB) to slide along the integrally fixed且one trajectories path unit (3BA) to the supporting member (3A) Is preferable.

The vibration addition device (3) of the present invention is an injection liquid (for example, cement) via an injection liquid supply system (100: glautomixer 1, grout pump 2, injection device 10, injection pipe or injection hose H connecting them). It is used in the injection method of injecting (milk, grout material) into the ground (G), and is interposed in the injection liquid supply system (100) (region near the injection port), and the injection pipe (H) through which the injection liquid flows is provided. A moving device (3A: hose support) for supporting (grasping) and a moving device (3A) that moves the support member (3A) in a direction perpendicular to the longitudinal direction of the injection pipe (H) (the pipe axis direction of the injection hose H). 3 In the vibration addition device (3) having B),
The moving device (3B) includes a track portion (3BA: rail) extending in a direction perpendicular to the longitudinal direction of the injection pipe (H) (the pipe axis direction of the injection hose H).
The support member (3A) supporting the injection pipe (H) reciprocates in the track portion (3BA), so that the support member (3A) is perpendicular to the longitudinal direction of the injection pipe (H: injection hose) (the pipe axis direction of the injection hose H). The function of adjusting the waveform, frequency, and amplitude of the injection pressure by adding vibration to the injection liquid by swinging the injection pipe (H) in the direction.
The waveform and frequency of the injection pressure when the injection liquid is injected without resistance and the flow rate in the injection liquid supply system (flow rate of the grout pump 2) can be fixed and controlled to the maximum flow rate (rated value: for example, 20 L / min). It has a function of adjusting the waveform, frequency, and amplitude of the injection pressure after the injection pressure rises and reaches a predetermined value (first threshold value Pc) without adjusting the amplitude. It is a feature.
The vibration addition device (3) of the present invention applies vibration to the injection liquid when the injection pressure of the injection liquid becomes larger than the limit pressure (second threshold value Pd) at which the ground is not destroyed. However, it is preferable to have a function of not adjusting the waveform, frequency, and amplitude of the injection pressure of the injection liquid.
The mobile device (3B) is preferably has a slider (3BB) to slide along one且integrally fixed trajectories path unit (3BA) to the supporting member (3A).

In carrying out the present invention, only one track portion (3BA) may be provided, or a plurality of track portions (3BA) may be provided.
When three or more track portions (3BA) are provided, the spacing between the track portions in the longitudinal direction (axial direction: arrow L direction in FIG. 2) of the injection pipe (H) may be uniform or non-uniform. It may be. In other words, the interval is preferably set according to the waveform, amplitude, frequency, etc. of the vibration to be applied to the grout material flowing in the injection hose.
When there are a plurality of track portions (3BA), the speed at which the slider (3BB) and the support member (3A) slide on the track portion (3BA) (the speed in the arrow V direction in FIG. 2) and the track portion ( The sliding distance (moving distance) on 3BA) is preferably set as appropriate according to the waveform, amplitude, frequency, etc. of the injection pressure to be realized by adding vibration to the injection liquid (grout material).

According to the present invention having the above-described configuration, the hose support (3A) and the slider (3BB) swing the injection hose (H) in a direction perpendicular to the longitudinal direction, thereby causing the inside of the injection hose (H). Vibration can be added to the grout material flowing through the hose.
By applying vibration to the grout material flowing in the injection hose (H), it can be reliably permeated into the ground.

In addition, the frequency and amplitude of the injection pressure (injection pressure waveform) of the grout material are not constant and change, which prevents the cement particles from forming bridges at the narrowed parts of the rock cracks, and grouts such as cement milk. The material can easily pass through cracks (narrowing points) in the bedrock.
Even if a bridge is formed and a blocked portion is formed, the hose support (3A) and the slider (3BB) swing the injection hose (H) in a direction perpendicular to the longitudinal direction, so that the injection hose (H) Since vibration is applied to the grout material flowing in the), it is possible to make the retained cement particles easy to move, eliminate the bridge, and open the closed portion.

Further, when the hose support (3A) and the slider (3BB) swing the injection hose (H) in the direction perpendicular to the longitudinal direction, the injection hose (H) extends in the direction perpendicular to the longitudinal direction. Vibration applied to the grout material flowing through the injection hose (H) by appropriately changing the number and spacing of the orbital portions (3BA: rails), the speed of movement on the orbital portion (3BA), and the moving distance. Since various characteristics such as the waveform, frequency, and amplitude of the injection pressure can be adjusted, it is not necessary to interpose a mechanism for superimposing a pulsation or a short wave on the injection tube.
The structure of the mechanism for superimposing pulsations or short waves is complicated, but in the present invention, since it is not necessary to interpose such a complicated mechanism in the injection pipe, the equipment for constructing the injection method becomes complicated. Is prevented, and the purchase cost and management cost of the mechanism required for construction can be significantly reduced. As a result, it is possible to save the construction cost.

It is a block diagram which shows the 1st Embodiment of this invention. It is explanatory drawing which shows the vibration addition apparatus in 1st Embodiment. It is a figure which shows an example of the slider in the vibration addition device of FIG. It is a characteristic figure which shows the injection flow rate characteristic and the injection pressure characteristic of a grout material in an embodiment. It is a characteristic figure which shows an example of the preferable characteristic of the injection pressure in an embodiment. It is a characteristic figure which shows an example of the preferable characteristic of the injection pressure in an embodiment. It is a characteristic figure which shows an example of the preferable characteristic of the injection pressure in an embodiment. It is a flowchart which shows the procedure of injection in an embodiment. It is a block diagram which shows the main part of the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
First, the first embodiment will be described with reference to FIGS. 1 to 8.
The device for executing the injection method of the first embodiment shown in FIGS. 1 to 3 includes an injection liquid supply system 100, and the injection liquid supply system 100 includes a grout mixer 1, a grout pump 2, and an injection device 10. , It has an injection hose H (injection pipe) that communicates them, and a vibration addition device 3. In other words, the vibration adding device 3 is interposed in the injection liquid supply system 100.
In FIG. 1, the grout mixer 1, the grout pump 2, the vibration addition device 3, and the injection device 10 are connected by an injection hose H. The grout material (injection liquid: for example, cement milk) kneaded by the grout mixer 1 is conveyed to the grout pump 2, and the grout material boosted by the grout pump 2 is conveyed to the vibration adding device 3.
After applying a predetermined vibration by the vibration adding device 3, the grout material is conveyed to the injection device 10 installed in the ground G and injected into the ground via the injection device 10.

The vibration adding device 3 is arranged in the vicinity of the injection port for injecting the grout material into the ground G in the injection device 10. The vibration addition device 3 is arranged near the injection port because when the vibration addition device 3 is separated from the injection port, the vibration applied to the grout material (by the vibration addition device 3) is generated by the grout material. This is because it is attenuated when it is injected into the ground G.
The injection hose H is oscillated by the vibration adding device 3 in a direction perpendicular to the longitudinal direction of the injection hose H (the pipe axis direction of the injection hose H), whereby vibration is applied to the grout material.
A mode in which vibration is applied to the grout material by the vibration adding device 3 will be described with reference to FIGS. 2 and 3.

In FIG. 2, the vibration adding device 3 has a hose support 3A (support member) and a moving device 3B (the rail 3BA of the moving device 3B is shown in FIG. 2).
The injection hose H is arranged from the grout pump 2 side (left side in FIG. 2) to the injection device 10 side (right side in FIG. 2). Two rails 3BA (track portion) are installed in a direction perpendicular to the longitudinal direction of the injection hose H (arrow L direction in FIG. 2, pipe axis direction) (arrow V direction in FIG. 2), and two rails are installed. Rail 3BA is a part of the components of the moving device 3B. The rail 3BA is fixed to the base 3C of the vibration adding device 3.
The injection hose H is supported (grasped) by two hose supports 3A in FIG. 2, and the two hose supports 3A each have two rails 3BA as described later with reference to FIG. It is configured to be reciprocally movable (sliding) in the direction of the arrow V (the direction perpendicular to the longitudinal direction of the injection hose H or the pipe axis direction) along the above.

In FIG. 3 showing an example of the moving device 3B of the vibration adding device 3, a rail is formed on the upper surface (upper side of FIG. 3A) of the base 3C of the vibration adding device 3 in the direction perpendicular to the paper surface in FIG. 3A. 3BA (track section) is installed (two are installed in FIG. 2), and the slider 3BB is configured to be able to reciprocate (slide) along the rail 3BA in the direction perpendicular to the paper surface of FIG. 3 (A). There is. The rail 3BA and the slider 3BB constitute a moving device 3B.
The slider 3BB has a slider main body 3BB-1 and a slider base 3BB-2, a hose support 3A is integrally attached to the main body 3BB-1, and the base 3BB-2 is attached to the rail 3BA. Are engaged.
As shown in FIG. 3B, the hose support 3A is formed in a shape that substantially surrounds the injection hose H, and supports or grips the injection hose H. Here, FIG. 3B shows a state in which the hose support 3A is viewed from the direction of the arrow F3B in FIG. 3A.

The slider 3BB is provided with a known moving mechanism. For example, the slider base 3BB-2 of FIG. 3A is made of a magnetic material such as iron, and the rail 3BA and the substrate 3C are made of a non-magnetic material capable of transmitting magnetic flux.
Further, on the side of the substrate 3C opposite to the rail 3BA (below the substrate 3C in FIG. 3A), a moving means 3D provided with a magnet (permanent magnet or electromagnet may be used) is provided. By a known mechanism (not shown), the moving means 3D is configured to be reciprocally movable along the rail 3BA in the direction perpendicular to the paper surface of FIG. 3 (A).

When the moving means 3D moves along the rail 3BA, the slider base 3BB-2 is attracted by the magnetic force, and the slider 3BB and the hose support 3A move in the same manner as the moving means 3D. However, the mechanism shown in FIG. 3 (a mechanism for moving the slider 3BB and the hose support 3A using magnetic force) is an example, and the slider 3BB and the hose support 3A may be appropriately moved along the rail 3BA by other mechanisms. Is possible.
By moving the slider 3BB and the hose support 3A, the injection hose H swings in a direction perpendicular to the longitudinal direction, and thus vibration is applied to the grout material flowing in the injection hose H, so that the grout material is swayed. It can be reliably penetrated into the ground.
Further, as a result of the vibration being added to the grout material, the frequency and amplitude in the injection pressure (injection pressure waveform) of the grout material can be changed non-constantly (the injection pressure can have a fluctuating waveform). By having a fluctuating waveform of the injection pressure, for example, cement particles are prevented from forming a bridge at a narrowed portion of a rock crack, and a grout material such as cement milk easily passes through a crack (narrowed portion) of the rock. be able to. Similarly, the formation of bridges is prevented.

Although FIG. 2 shows a mode in which two rails 3BA are installed, only one rail may be installed, or three or more rails may be installed.
Further, when three or more rails are provided, the distance between the rails in the longitudinal direction (axial direction: arrow L direction in FIG. 2) of the injection hose H may be uniform or non-uniform.
By reciprocating (sliding) the hose support 3A (slider 3BB) and swinging the injection hose H in the direction perpendicular to the longitudinal direction (the arrow V direction in FIG. 2), the frequency at the injection pressure of the ground material. , A variable waveform whose amplitude is not constant can be realized, but by appropriately setting the number of rails and the distance between the rails (when three or more rails are provided), the variable waveform (waveform, amplitude, frequency, etc.) Can be adjusted. In other words, the number of rails and the distance between the rails may be set (adjusted) according to the fluctuation waveform (waveform, amplitude, frequency, etc.) desired to be realized with respect to the injection pressure of the grout material.

When there are a plurality of rails 3BA, the speed at which each slider 3BB and hose support 3A moves (slides) along each rail 3BA (speed in the arrow V direction in FIG. 2) and the slider 3BB and hose support. Regarding the moving distance (sliding distance) at which the tool 3A moves (slides) on the rail 3BA, the waveform, amplitude, frequency, etc. (fluctuation waveform) desired to be realized with respect to the injection pressure of the grout material flowing in the injection hose H can be obtained. Correspondingly, it can be set (adjusted) as appropriate.
In this way, by appropriately changing the number and spacing of the rail 3BA, the moving speed (sliding speed) of the slider 3BB and the hose support 3A moving on the rail 3BA, and the moving distance, the waveform of the injection pressure of the grout material, Since various characteristics such as frequency and amplitude can be adjusted, it is not necessary to interpose a mechanism for superimposing pulsations or short waves in the injection tube. Therefore, it is possible to prevent the equipment for constructing the injection method from becoming complicated and to save the construction cost.

FIG. 4 shows the characteristics (QT) of the injection flow rate of the grout material and the characteristics (PT) of the injection pressure of the grout material in the first embodiment. The injection flow rate of the grout material and the injection pressure of the grout material can be measured, for example, by a conventionally known flow rate measuring means and pressure measuring means (not shown) arranged between the vibration adding device 3 and the injection device 10 in FIG.
In FIG. 4, the vertical axis shows the flow rate and the discharge pressure, and the horizontal axis shows the time.
In earlier stage than the time T ₁ of the FIG. 4, the vibration adding device 3 (FIG. 1, FIG. 2) is stopped, injection hose H is not oscillating, control and as the flow rate of the grout is maximum ing. On the other hand, the time T ₁ after the region, the injection hose H by the longitudinal direction (tube axis direction) which swings in a direction perpendicular, by controlling the injection pressure, injection flow rate of the grout by vibration adding device 3 There is.

In the earlier stage than the time T ₁ 4, grout is injected into the resistor without construction rock, etc., the maximum flow rate the flow rate of the grout pump 2 (rated value: for example, every minute 20L) for controlling fixed to be able to. In other words, in this case, it is not necessary to swing the injection hose H by the vibration adding device 3.
As the grout material is injected, the resistance increases due to various factors, and the injection pressure of the grout material increases. Then, when the injection pressure (average value of the injection pressure) of the grout material reaches a predetermined value Pc (first threshold value), the vibration addition device 3 swings the injection hose H, and the grout material in the injection hose is shaken. A predetermined vibration is applied to the grout material to fluctuate the injection pressure of the grout material in a wavy manner.
By swinging the injection hose H and applying a predetermined vibration to the grout material in the injection hose, the injection hose H is shaken _{after the time T 1} (at the time T ₁ in FIG. 4, the vibration adding device 3 shakes the injection hose H). The grout material injection pressure fluctuates in a wavy shape, for example, from the time when the time lag from the movement to the addition of vibration to the grout material is added). The wavy change (fluctuation) in the grout material injection pressure reduces the resistance during grout material injection and increases the grout material injection flow rate.

In FIG. 4, the characteristic curve Qa of the grout material injection flow rate shows the injection flow rate when the vibration addition device 3 is not operated and the injection pressure does not actively fluctuate. On the other hand, the characteristic curve Qb shows the injection flow rate of the grout material when the injection hose H is swung by the vibration adding device 3 to fluctuate the grout material injection pressure in a wavy manner.
As shown in FIG. 4, the injection flow rate Qb of the grout material when the grout material injection pressure is fluctuated in a wavy manner is larger than the injection flow rate Qa when the vibration addition device 3 is not operated, and the grout material injection pressure is wavy. The increase in the injection flow rate of the grout material (= Qb-Qa) due to the variation is indicated by the area of the region indicated by the symbol ΔQ in FIG. 4 (the portion hatched in FIG. 4).

Although not explicitly shown in FIG. 4, when the grout material injection pressure is fluctuated in a wavy manner, injection is performed at a predetermined pressure Pd (second threshold value: limit pressure at which the ground is not destroyed) different from the predetermined value Pc. If the pressure increases, the ground may be destroyed.
In such a case, even if the injection pressure is Pc or more, the vibration of the injection hose by the vibration adding device 3 is temporarily stopped, and a predetermined process is performed. Here, the "predetermined treatment" is, for example, various treatments performed in the prior art when the injection pressure has increased to the extent that there is a risk of damaging the ground.

FIGS. 5 to 7 exemplify the fluctuation waveform of the injection pressure of the grout material that fluctuates by swinging the injection hose H by the vibration adding device 3, and shows a preferable waveform (characteristic) in the fluctuation of the injection pressure of the grout material. ing.
FIG. 5 is a waveform in which the amplitude in the fluctuation waveform of the injection pressure is kept constant and the period or frequency in the fluctuation waveform of the injection pressure is changed.
FIG. 6 is a waveform in which the period or frequency of the fluctuation waveform of the injection pressure is kept constant and the amplitude of the injection pressure in the fluctuation waveform is changed.
FIG. 7 is a waveform in which the frequency (or period) and amplitude of the fluctuation waveform of the injection pressure change.

Fluctuation waveform of the injection pressure of the grout varying the injection hose H by the vibration adding device 3 by rocking (variation characteristics of the injection pressure of the grout in the phase of the time T ₁ after the FIG. 4), in FIGS. 5 to 7 It is not limited to the waveform.
Although not shown, the number of rails 3BA in the moving device 3B, the distance between the rails 3BA in the longitudinal direction of the injection hose H (axial direction: the arrow L direction in FIG. 2), the slider 3BB and the hose support 3A along the rail 3BA. The variable waveform shown in FIGS. 5 to 7 can be obtained by appropriately adjusting the moving speed (the speed in the arrow V direction in FIG. 2), the moving distance of the slider 3BB and the hose support 3A on the rail 3BA, and the like. In addition to being able to do so, for example, the injection pressure of the grout material can fluctuate in a serrated shape, in a triangular wave shape, or in a rectangular wavy shape. It is also possible to superimpose a plurality of waveforms having different frequencies and amplitudes.

Next, the procedure for performing the injection as shown in FIG. 4 using the apparatus shown in FIGS. 1 and 2 will be described with reference to the flowchart of FIG.
In FIG. 8, at the time of construction, first, the grout pump 2 (FIG. 1) is started, and the grout material kneaded by the grout mixer 1 at the maximum flow rate of the grout pump 2 (rated value: for example, 20 L / min). Is discharged to the vibration adding device 3 and the injection device 10 side. Then, in step S1, it is determined whether or not the injection pressure P of the grout material has been increased to the first threshold value (pressure Pc in FIG. 4) in a conventionally known manner.
If the injection pressure P of the grout material is increased to the first threshold value Pc (step S1 is “YES”), the process proceeds to step S3.
On the other hand, if the injection pressure P of the grout material has not been increased to the first threshold value Pc (step S1 is “NO”), the process proceeds to step S2. Since the grout material is injected at the rated value without applying vibration, step S2 continues the process of injecting the grout material at the rated value without applying vibration, and returns to step S1 (step S1 is "NO". Loop).

In step S3 (when the injection pressure P of the ground material is increased to the first threshold value Pc), the injection hose H is oscillated by the vibration adding device 3 (FIGS. 1 to 3), and the ground flowing through the injection hose H. The injection pressure of the material is fluctuated in a wavy manner, and for example, as shown in FIGS. 5 to 7, the frequency (or period) and / or amplitude in the wavy fluctuation characteristic of the injection pressure (fluctuation waveform of the injection pressure) is changed. ..
By fluctuating the injection pressure P of the grout material and changing the frequency (or period) and / or amplitude in the fluctuation characteristics (waveform) of the injection pressure to a predetermined value, the resistance in the grout material injection is reduced and the injection is performed. Compared with the case where the pressure is not changed, the injection flow rate of the grout material is increased by the region indicated by the symbol ΔQ in FIG. Then, the process proceeds to step S4.

If the injection pressure P of the grout material becomes too large as a result of adding vibration to the grout material in step S3, the ground may be destroyed. In order to prevent such ground destruction, the maximum injection pressure that does not destroy the ground is set in advance as the second threshold value Pd in a conventionally known manner. Then, in step S4, it is determined whether or not the injection pressure P of the grout material, which fluctuates due to the addition of vibration, has been increased to the second threshold value Pd (the maximum injection pressure that does not destroy the ground).
In step S4, when it is determined that the injection pressure P of the grout material that fluctuates due to the addition of vibration has not been increased to the second threshold value (the maximum injection pressure that does not destroy the ground) (step S4). Is "NO"), the process returns to step S3, and the injection of the grout material to which the vibration is added is continued (step S4 is a loop of "NO").
When it is determined that the injection pressure P of the grout material, which fluctuates due to the addition of vibration, has been increased to the second threshold value Pd (the maximum injection pressure that does not destroy the ground) (step S4 is “YES”). , Stop the grout pump 2 to prevent the destruction of the ground. Then, the injection work is completed.
Although not clearly shown in FIG. 8, when the injection pressure P of the grout material is increased to the second threshold value Pd (step S4 is “YES”), the operation of the vibration adding device 3 is temporarily suspended and predetermined. (Various treatments performed in the prior art when the injection pressure has increased to the extent that there is a risk of damaging the ground) can be performed.

Next, a second embodiment of the present invention will be described with reference to FIG.
In the first embodiment, the hose support 3A and the slider 3BB reciprocate only on the rail 3BA, that is, in the direction perpendicular to the longitudinal direction (tube axis direction) of the injection hose H, but in the second embodiment, the hose support and the slider 3BB reciprocate. The slider can freely move in various directions other than the direction perpendicular to the longitudinal direction of the injection hose H.
As shown in FIG. 9, in the vibration adding device 4 of the second embodiment, the moving member 4A holding the hose support (not shown) is a closed space whose peripheral portion is surrounded by a partition wall (in FIG. 9, the closed space of the closed space). The inner wall surface of the partition wall is indicated by reference numeral 4B) and goes straight. In FIG. 9, the movement locus of the moving member 4A is indicated by a broken line arrow. As shown by the broken line arrow in FIG. 9, when the moving member 4A collides with the inner wall surface 4B of the closed space, the moving member 4A changes its direction by a predetermined angle (for example, 90 degrees) and goes straight toward the inside of the closed space again. It is configured in.

The hose support attached to the moving member 4A can add a complicated motion to the supporting injection hose by randomly moving in the closed space. As a result, the grout material flowing in the injection hose is subjected to various types of vibrations, which are more complicated than those in the first embodiment.
When the moving member 4A collides with the inner wall surface 4B of the closed space, the moving member 4A changes its direction by a predetermined angle (for example, 90 degrees) and goes straight toward the inside of the closed space again, or a more complicated movement is conventionally performed. A known mechanism is applied.
Other configurations and effects in the second embodiment of FIG. 9 are the same as those of the first embodiment of FIGS. 1 to 8.

It should be added that the illustrated embodiment is merely an example and is not a description intended to limit the technical scope of the present invention.
For example, although not shown in the illustrated embodiment, the injection pressure may be changed by a characteristic expressed by a sawtooth waveform, a characteristic expressed by a triangular wavy waveform, or expressed by a rectangular wavy waveform. It is possible to have the characteristics to be.

1 ... Grout mixer 2 ... Grout pump 3 ... Vibration addition device 3A ... Hose support (support member)
3B ・ ・ ・ Moving device 3BA ・ ・ ・ Rail (track part)
3BB ・ ・ ・ Slider 10 ・ ・ ・ Injection device 100 ・ ・ ・ Injection liquid supply system H ・ ・ ・ Injection hose

Claims (4)

In the injection method of injecting the injection liquid into the ground (G) via the injection liquid supply system (100) ,
A vibration addition device (3) interposed in the injection liquid supply system (100) and arranged in the vicinity of the injection device (10) is provided.
The vibration addition device (3) moves the support member (3A) that supports the injection pipe (H) through which the injection liquid flows and the support member (3A) in a direction perpendicular to the longitudinal direction of the injection pipe (H). It has a device (3B), and the moving device (3B) includes a track portion (3BA) extending in a direction perpendicular to the longitudinal direction of the injection pipe (H).
By injection pipe (H) supporting the support member (3A) reciprocates track portion (3BA), the longitudinal direction of the injection pipe (H) is rocked injection pipe (H) in a direction perpendicular It has a step of adjusting the waveform, frequency, and amplitude of the injection pressure of the injection liquid by adding vibration to the injection liquid.
The process of adjusting the waveform, frequency, and amplitude of the injection pressure is not performed when the injection liquid is injected without resistance and the flow rate in the injection liquid supply system can be fixed and controlled to the maximum flow rate, but the injection pressure rises. An injection method characterized in that it is executed after reaching a predetermined value (Pc). When the injection pressure of the injection solution becomes larger than the limit pressure (Pd) at which the ground is not destroyed, the waveform, frequency, and amplitude of the injection pressure of the injection solution should be adjusted without adding vibration to the injection solution. The injection method according to claim 1, wherein the method is not performed. Injected via the injection fluid supply system (100) was used in the injection method of injecting into the ground (G), is interposed injectate supply system (100), supporting the injection pipe infusate flows (H) In the vibration addition device (3) having a support member (3A) to be used and a moving device (3B) for moving the support member (3A) in a direction perpendicular to the longitudinal direction of the injection pipe (H).
The moving device (3B) includes a track portion (3BA) extending in a direction perpendicular to the longitudinal direction of the injection pipe (H).
The support member (3A) supporting the injection pipe (H) reciprocates in the track portion (3BA), so that the injection pipe (H) swings in a direction perpendicular to the longitudinal direction of the injection pipe (H). A function to adjust the waveform, frequency, and amplitude of the injection pressure by adding vibration to the injection liquid,
When the injection liquid is injected without resistance and the flow rate in the injection liquid supply system can be fixed and controlled to the maximum flow rate, the waveform, frequency, and amplitude of the injection pressure are not adjusted, and the injection pressure rises to a predetermined value. A vibration addition device having a function of adjusting the waveform, frequency, and amplitude of the injection pressure after reaching the value (Pc). When the injection pressure of the injection solution becomes larger than the limit pressure (Pd) at which the ground is not destroyed, the waveform, frequency, and amplitude of the injection pressure of the injection solution should be adjusted without adding vibration to the injection solution. The vibration addition device according to claim 3, which has a function of not performing the above.

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