JP6828891B2 - Chemical injection device with ultrasonic vibration, double packer chemical injection method - Google Patents

Description

The present invention relates to a device for injecting a chemical solution in combination with ultrasonic vibration, and a double packer chemical solution injection method performed using the device.

Conventionally, a chemical injection method for preventing damage such as liquefaction caused by an earthquake and sediment collapse due to ground excavation is well known. In this method, a chemical solution, which is a solidifying material, is pumped by a grout pump to permeate into the soil particle gaps in the ground and solidify. In that case, in the ground where there are many fine particles and the soil particle gaps are small, the fine particles of the ground move due to the pumping of the chemical solution, causing clogging of the soil particle gaps and impairing water permeability, which hinders the penetration of the chemical solution. There is a problem that it is easy. When clogging occurs, the chemical solution does not penetrate into the soil particle gaps, and the ground is split by the injection pressure, and the chemical solution enters the ground and solidifies, which is an unfavorable split injection state.

Patent Document 1 describes high-pressure injection of highly viscous cement-based chemicals by continuously increasing or decreasing the chemical injection pressure over time and continuously in a cycle of several seconds to 15 seconds and gradually increasing the maximum pressure and the minimum pressure in each cycle. However, a chemical injection method (dynamic injection method) for infiltrating and injecting in all directions without causing cracking of the ground is disclosed.

In Patent Document 2, the solidifying material is injected into the surrounding ground by injecting the solidifying material while applying vibration in the ultrasonic region by a solidifying material vibration injection device composed of a rod-shaped vibrating body provided with an ultrasonic vibration generator. A chemical injection method (solidifying material vibration injection method) that enhances the permeation / diffusion effect is disclosed.

On the other hand, a double-tube double packer chemical injection method, which is one of the chemical injection methods, is known (for example, Patent Document 3). In this method, an injection outer pipe is built in the casing drilling hole, an injection inner pipe equipped with a double packer is inserted into the injection outer pipe, and a chemical solution is applied to the surrounding ground area between the double packers while changing the axial position of the injection inner pipe. Is to be injected.

Patent Document 4 discloses a method of injecting a chemical solution while giving vibration by providing an oscillator with an eccentric weight between the double packers in the double tube double packer chemical injection method.

However, each of the above-mentioned conventional construction methods has the following problems. In the dynamic injection method of Patent Document 1, the split injection cannot be completely eliminated, and it is difficult to obtain a uniform solidified body. It is also difficult to control the constantly changing injection pressure.

In the solidifying material vibration injection method using ultrasonic vibration described in Patent Document 2, when a slurry-like suspension type solidifying material is used, the solidifying material stays in the ground around the drilling even if ultrasonic vibration is also used. , It is difficult to penetrate and diffuse in the distance. Further, in order to permeate and diffuse the slurry-like solidifying material over as wide a range as possible, if a low-viscosity material having a long curing time is used, even if it is discharged in the drilling, it easily leaks from the hole opening to the ground surface before penetrating into the ground. There is a problem. In addition, in the chemical injection method using ultrasonic vibration, the ultrasonic vibration is also transmitted to the inside of the chemical injection device, so that the members inside the device are constantly exposed to the ultrasonic vibration and are easily deteriorated and damaged. There is also.

The double-tube double packer chemical injection method has the advantage that the discharge area of the solidifying material in the ground can be defined, but since the chemical is spherically permeated from one point to a hemispherical shape, there are many fine particles. The injection resistance is large in the ground, and the above-mentioned split injection is likely to occur. If the discharge rate is slowed down in order to reduce the injection resistance, there is a problem that the construction time becomes long. For these reasons, when a wide penetration range cannot be obtained, the number of holes to be drilled must be increased and the work must be performed densely (for example, 1 m pitch). Further, at present, a sufficient permeation injection effect cannot be obtained by the combined use of the double tube double packer chemical injection method of Patent Document 4 and mechanical vibration.

Under such circumstances, the present inventors have already proposed a novel ultrasonic vibration combined chemical injection device capable of solving the above problem and a construction method using the same (Japanese Patent Application No. 2016-183634). This device is provided with a discharge port for discharging a solidifying material, an ultrasonic vibration generating portion, and the like between the base end side packer and the tip end side packer. The ultrasonic vibration generator includes an ultrasonic generator, an ultrasonic amplifier, an ultrasonic resonator, etc., and at a position slightly separated from them in the direction of the packer on the tip side, an ultrasonic wave is reflected and diffused. A sound diffuser is provided. By adopting such a configuration, it is expected that the solidifying material can be effectively permeated and diffused into the surrounding ground.

Japanese Unexamined Patent Publication No. 2005-330805 Japanese Unexamined Patent Publication No. 2008-20863 Japanese Unexamined Patent Publication No. 9-3868 Japanese Unexamined Patent Publication No. 3-271419

By the way, the above-mentioned chemical injection device with ultrasonic vibration proposed by the present inventors is sufficiently excellent at present, but it is considered that there is still room for improvement in terms of structure.

For example, in this chemical injection device, it is necessary to insert the ultrasonic vibration generating portion into the limited space of the injection outer tube (for example, the inner diameter is about several tens of mm). In this case, if a small ultrasonic vibration generating unit is selected with priority given to ease of insertion, it becomes necessary to make the ultrasonic wave generator or the like thinner, and the output of ultrasonic waves is sacrificed. Therefore, in order to obtain a sufficiently large output, it is desirable to select an ultrasonic vibration generating unit as large as possible. However, when an ultrasonic vibration generating part with a relatively large output is inserted into a narrow space and operated, the tip of the ultrasonic vibration generating part (that is, the ultrasonic output end of the ultrasonic resonator) is particularly affected by erosion (erosion). Deterioration and damage, resulting in reduced output. Therefore, it is necessary to replace the entire ultrasonic resonator with a new one before the output decrease occurs. Normally, in this case, complicated maintenance work involving disassembly, assembly, adjustment, etc. is unavoidable, but it is expected that it will not be easy to perform at such a complicated work site. Therefore, it is desired that the structure is easy to maintain.

Further, in this chemical injection device, air supply pipes are connected to the base end side packer and the tip end side packer, respectively, and each packer is inflated by supplying air through the air supply pipes. It has become. By the way, since the packer on the base end side is located closer to the ultrasonic vibration generating portion when viewed from the ground surface, the ultrasonic vibration generating portion does not get in the way and the degree of freedom in arranging the air supply pipe is large. On the other hand, since the packer on the tip side is located farther than the ultrasonic vibration generating portion, the ultrasonic vibration generating portion on the central axis becomes an obstacle, and the degree of freedom in arranging the air supply pipe is small. Therefore, at present, it is necessary to have a structure in which the air supply pipe is passed through a very narrow space formed by the outer peripheral surface of the vibrator case constituting the ultrasonic vibration generating portion and the inner peripheral surface of the injection outer pipe. For this reason, it is necessary to make the ultrasonic vibration generating part somewhat smaller in order to secure space, or when the ultrasonic vibration generating part is inserted into the injection outer pipe, the air supply pipe overhanging in the radial direction hits and inserts. Problems such as difficulty in working or repeated exposure to ultrasonic vibration in an incompletely fixed state are expected to cause the air supply pipe to be easily deformed or damaged. Therefore, it is desired that the structure can solve the above-mentioned problems with the air supply pipe for the tip side packer.

Further, in this chemical injection device, for example, a configuration is adopted in which a base end side packer and a tip end side packer are connected and fixed to an ultrasonic vibration generating portion via a support member, but ultrasonic vibration with a relatively large output is adopted. When the generating part is selected, it is expected that the influence of ultrasonic vibration is likely to appear on the connected and fixed part. Therefore, in order to improve the durability of the device, it is desirable to take some measures in advance for this part.

Further, when the ultrasonic vibrator unit is continuously operated at a high output, the temperature inside the vibrator case gradually rises due to heat generation, and it is expected that the ultrasonic output decreases accordingly. Therefore, the ultrasonic vibrator unit should be cooled by some means, but even if a cooling fan or the like is installed, there is not enough space in the vicinity of the ultrasonic vibrator unit. In addition, heat cannot be released around the ultrasonic oscillator unit. Therefore, in order to improve operational stability and durability, a structure capable of reliably cooling the ultrasonic oscillator unit is desired.

The present invention has been made in view of the above problems, and an object of the present invention is to be able to effectively permeate and diffuse the solidifying material into the surrounding ground and prevent deterioration and damage of the chemical injection device due to ultrasonic vibration. It is an object of the present invention to provide an ultrasonic vibration combined chemical injection device and a construction method using the same, which are improved in terms of durability, maintainability, operational stability, and the like.

In order to solve the above problems, the invention according to claim 1 is an ultrasonic vibration combined chemical injection device used in a double packer chemical injection method using ultrasonic vibration, and the injection tube main body and the injection tube. The base end side packer and the tip end side packer provided at the tip of the main body at predetermined intervals in the axial direction, and the base end side packer and the tip end side for discharging the solidifying material pumped through the injection pipe main body. It is provided with a discharge port provided between the side packers and an ultrasonic vibration generating portion provided between the base end side packer and the tip end side packer, and the ultrasonic vibration generating portion is the injection pipe main body. The ultrasonic vibrator unit, the ultrasonic amplifier, and the ultrasonic resonator arranged in order from the base end side packer side on the central axis are separated from the ultrasonic output end of the ultrasonic resonator and placed on the central axis. It has an ultrasonic diffuser that is arranged and reflects the ultrasonic waves and diffuses in the radial direction of the injection tube body, and a tip member is detachably connected to the ultrasonic output end of the ultrasonic resonator. The gist of this is a chemical injection device with ultrasonic vibration.

Therefore, according to the invention of claim 1, the ultrasonic waves generated by the ultrasonic vibrator unit of the ultrasonic vibration generating unit provided between the two packers are further subjected to the ultrasonic amplifier and the ultrasonic resonator. After being amplified and resonated, it is emitted from the ultrasonic output end. Then, ultrasonic waves propagate to the solidifying material and the injection pipe body, and as a result of these ultrasonic vibrations, the solidifying material particles and the soil particles of the surrounding ground vibrate ultrasonically. By making it possible to inject the chemical solution in combination with ultrasonic vibration in this way, the solidifying material can be effectively permeated and diffused into the surrounding ground. Further, in the present invention, the ultrasonic diffuser provided at a position separated from the ultrasonic output end of the ultrasonic resonator reflects the ultrasonic waves, so that the ultrasonic waves are diffused in the radial direction of the injection tube main body. Therefore, as a result of blocking the propagation of ultrasonic waves toward the tip side and the reflection toward the base end side of the ultrasonic diffuser, members that are vulnerable to vibration in the device are less likely to be exposed to ultrasonic vibration, and the chemical solution due to ultrasonic vibration It is possible to prevent deterioration and damage of the injection device (the above is referred to as "main action effect" for convenience).
Further, in the present invention, not only the above-mentioned main action and effect but also the following action and effect are exhibited. That is, since the tip member is detachably connected to the ultrasonic output end of the ultrasonic resonator, even if deterioration damage occurs on the ultrasonic output end side due to erosion, only the tip member should be replaced with a new one. Can be done. Therefore, it is not necessary to replace the entire ultrasonic resonator with a new one, and maintainability is improved. Further, since the work of replacing only the tip member does not necessarily involve disassembly, assembly, adjustment, etc., it can be performed at a work site, for example. The cost is also improved as compared with the case where the entire ultrasonic resonator needs to be renewed.

The gist of the invention according to claim 2 is that at least the tip surface of the tip member is covered with a corrosion-resistant protective film in claim 1.

Therefore, according to the invention of claim 2, since the tip surface is not in direct contact with the chemical solution by being covered with the corrosion-resistant protective film, deterioration damage due to erosion is less likely to occur, and the life of the tip member can be extended. it can.

The gist of the invention according to claim 3 is that the tip surface of the tip member is convex in claim 1 or 2.

Therefore, according to the invention of claim 3, the ultrasonic waves are more easily dispersed in the radial direction as compared with the case where the tip surface of the tip member is flat, so that the ultrasonic vibration propagates to the ultrasonic diffuser. The amount of the ultrasonic diffuser can be reduced and the deterioration of the ultrasonic diffuser can be delayed.

The invention according to claim 4 is an ultrasonic vibration combined chemical injection device used in a double packer chemical injection method using ultrasonic vibration in the axial direction at the injection tube main body and the tip of the injection tube main body. It is provided between the base end side packer and the tip side packer provided at a predetermined interval and the base end side packer and the tip side packer for discharging the solidifying material pumped through the injection pipe main body. The base end is provided with a discharge port and an ultrasonic vibration generating portion provided between the base end side packer and the tip end side packer, and the ultrasonic vibration generating portion is on the central axis of the injection pipe main body. The ultrasonic vibrator unit, the ultrasonic amplifier, and the ultrasonic resonator arranged in order from the side packer side are arranged on the central axis away from the ultrasonic output end of the ultrasonic resonator and reflect the ultrasonic waves. It has an ultrasonic diffuser that diffuses in the radial direction of the injection tube body and a vibrator case that airtightly accommodates the ultrasonic vibrator unit in the internal space, and holds a pipe on the outer peripheral surface of the vibrator case. The gist of the present invention is an ultrasonic vibration combined chemical injection device characterized in that the groove is recessed and the air supply pipe for the tip side packer is held and fixed in the pipe holding groove.

Therefore, according to the invention of claim 4, in addition to the above-mentioned "main action and effect", the following action and effect are also exerted. That is, since the ultrasonic vibrator unit is airtightly housed in the internal space of the vibrator case, the ultrasonic vibrator unit is not directly exposed to the surrounding chemicals, and the ultrasonic vibrator unit is deteriorated and damaged. Is avoided. Further, since the pipe holding groove is recessed on the outer peripheral surface of the vibrator case and the air supply pipe for the tip side packer is held and fixed there, even if it is repeatedly exposed to ultrasonic vibration, the pipe holding groove is concerned. The air supply pipe is less likely to be deformed or damaged. Further, as a result of the air supply pipe entering the outer peripheral surface of the vibrator case, the air supply pipe does not project in the radial direction, so that the air supply pipe does not get in the way when the ultrasonic vibration generating portion is inserted into the injection outer pipe. .. Therefore, the insertion work can be easily performed. Further, in this case, it is not necessary to dispose the air supply pipe so as to avoid the vibrator case, so that the air supply pipe can be used in a straight state without being bothered to bend at the vibrator case part. Become. Further, since it is not necessary to secure a pipe installation space between the outer peripheral surface of the vibrator case and the inner peripheral surface of the injection outer pipe, it is possible to use a larger ultrasonic vibration generating portion.

The invention according to claim 5 is configured in claim 4 so that the ultrasonic amplifier and the ultrasonic resonator form an integral structure, and the air supply pipe for the tip side packer is formed with the pipe holding groove. The gist is that the ultrasonic resonator is inserted through the flange portion arranged at the same position on the outer circumference.

For example, if the ultrasonic amplifier and the ultrasonic resonator have a separate structure and both are screwed and fixed, the pipe insertion recess in the flange of the ultrasonic resonator holds the pipe during assembly. There is a possibility that it will deviate from the same position on the outer circumference of the groove. On the other hand, according to the invention of claim 5, since the ultrasonic amplifier and the ultrasonic resonator are configured to form an integral structure, both of them cannot rotate with each other. Therefore, there is no concern that the pipe insertion recess in the flange of the ultrasonic resonator will deviate from the same position on the outer circumference as the pipe holding groove during assembly. Therefore, the air supply pipe for the tip side packer can be easily and surely inserted into both the pipe holding groove and the pipe insertion recess in the flange portion, and the assembling property is improved. Further, even in this case, the air supply pipe can be used in a straight state without being bothered to bend. Further, if the air supply pipe is configured to be held and fixed even in the pipe insertion recess in the flange portion, the fixing strength of the air supply pipe can be further increased.

According to a sixth aspect of the present invention, in the fourth or fifth aspect, the vibrator case and the ultrasonic resonator are welded and joined, and the air supply pipe for the tip side packer is formed on the pipe holding groove and the outer periphery. The gist is that it is inserted through the flange of the ultrasonic resonator arranged at the same position.

Therefore, according to the invention of claim 6, since the vibrator case and the ultrasonic resonator are fixed to each other by welding so as not to rotate, the pipe insertion recess in the flange portion of the ultrasonic resonator is assembled. There is no need to worry about the pipe holding groove and the outer circumference being displaced from the same position. Therefore, the air supply pipe for the tip side packer can be easily and surely inserted into both the pipe holding groove and the pipe insertion recess in the flange portion, and the assembling property is improved. Further, even in this case, the air supply pipe can be used in a straight state without being bothered to bend. Further, if the air supply pipe is configured to be held and fixed even in the pipe insertion recess in the flange portion, the fixing strength of the air supply pipe can be further increased.

The invention according to claim 7 is an ultrasonic vibration combined chemical injection device used in a double packer chemical injection method using ultrasonic vibration in the axial direction at the injection tube main body and the tip of the injection tube main body. It is provided between the base end side packer and the tip side packer provided at a predetermined interval and the base end side packer and the tip end side packer for discharging the solidifying material pumped through the injection pipe main body. It is provided with a discharge port and an ultrasonic vibration generating portion provided between the proximal end side packer and the distal end side packer, and the ultrasonic vibration generating portion is the proximal end on the central axis of the injection pipe main body. The ultrasonic vibrator unit, the ultrasonic amplifier, and the ultrasonic resonator arranged in order from the side packer side are arranged on the central axis away from the ultrasonic output end of the ultrasonic resonator and reflect the ultrasonic waves. A support member having an ultrasonic diffuser that diffuses in the radial direction of the injection tube body and supporting at least the tip side packer among the base end side packer and the tip end side packer is the ultrasonic vibration generating portion. The gist of this is a chemical injection device with ultrasonic vibration, which is characterized in that it is connected and fixed at a position where it becomes a node of ultrasonic vibration.

Therefore, according to the invention of claim 7, in addition to the above-mentioned "main action and effect", the following action and effect are also exerted. That is, at least the support member that supports the tip side packer is connected and fixed at a position that becomes a node of ultrasonic vibration in the ultrasonic vibration generating portion, so that the influence of ultrasonic vibration on the connecting portion between the members is minimized. It can be suppressed. Therefore, the durability of the device is improved.

The invention according to claim 8 is an ultrasonic vibration combined chemical injection device used in a double packer chemical injection method using ultrasonic vibration in the axial direction at an injection tube main body and the tip of the injection tube main body. It is provided between the base end side packer and the tip side packer provided at a predetermined interval and the base end side packer and the tip end side packer for discharging the solidifying material pumped through the injection pipe main body. It is provided with a discharge port and an ultrasonic vibration generating portion provided between the proximal end side packer and the distal end side packer, and the ultrasonic vibration generating portion is the proximal end on the central axis of the injection pipe main body. The ultrasonic vibrator unit, the ultrasonic amplifier, and the ultrasonic resonator arranged in order from the side packer side are arranged on the central axis away from the ultrasonic output end of the ultrasonic resonator and reflect the ultrasonic wave. It has an ultrasonic diffuser that diffuses in the radial direction of the injection tube main body and a vibrator case that airtightly accommodates the ultrasonic transducer unit in the internal space, and the ultrasonic transducer unit is housed in the internal space. The introduction pipe that introduces the cooling gas for cooling from the base end side of the injection pipe main body, and the discharge that returns the cooling gas introduced into the internal space to the base end side of the injection pipe main body and discharges it. The gist of this is a chemical injection device with ultrasonic vibration, which is characterized by being provided with a tube.

Therefore, according to the invention of claim 8, in addition to the above-mentioned "main action and effect", the following action and effect are also exerted. That is, since the ultrasonic vibrator unit is airtightly housed in the internal space of the vibrator case, the ultrasonic vibrator unit is not directly exposed to the surrounding chemicals, and the ultrasonic vibrator unit is deteriorated and damaged. Is avoided. Further, according to the present invention, the heat of the ultrasonic vibrator unit is taken away by the cooling gas introduced through the introduction pipe. The high-temperature cooling gas is surely returned to the base end side of the injection pipe body through a discharge pipe provided in a different route from the introduction pipe, and is discharged. Therefore, the ultrasonic vibrator unit can be efficiently cooled even if there is not enough space in the vicinity of the ultrasonic vibrator unit. Therefore, the operational stability of the device is improved, and the durability is also improved.

The invention according to claim 9 is a method using the chemical injection device according to any one of claims 1 to 8, wherein a step of forming a hole in the ground and a plurality of along the axial direction The step of building the injection outer pipe provided with the chemical discharge portions at predetermined intervals into the drilling hole and the chemical liquid injection device being inserted into the injection outer pipe, and the base end side packer and the tip end side packer are described. The solidifying material is discharged from the discharge port while generating ultrasonic waves by the step of closely fixing to the inner peripheral surface of the injection outer pipe and the ultrasonic vibration generating portion of the chemical injection device, and the chemical liquid is discharged from the injection outer pipe. The gist of the method is the double packer chemical injection method, which is characterized by having a step of infiltrating the solidifying material into the ground through the part.

Therefore, according to the invention of claim 9, the solidifying material is injected into the ground by using the double packer chemical injection method, and at the same time, ultrasonic waves are generated by the chemical injection device to superimpose the solidifying material and the injection outer pipe. Sound waves propagate and these oscillate. As a result, the solidifying material particles and the soil particles in the surrounding ground are ultrasonically vibrated. As a result, the solidifying material particles and the soil particles float and move, so that the soil particle gaps are not blocked even in the ground with a large amount of fine particles, and the solidifying material particles enter the soil particle gaps and reach a distance due to the capillary phenomenon. To reach. Further, due to the effect of ultrasonic vibration, columnar permeation is promoted instead of or in addition to the conventional spherical permeation, the injection resistance is reduced, and a homogeneous and large solidified body can be obtained. According to the present invention, it is possible to infiltrate and inject a slurry-like suspension type solidifying material. Further, since the solidified body can be formed in a wider range than before by using one injection hole, the number of holes to be drilled can be reduced and the construction cost can be reduced. For example, the number of holes drilled can be changed from 1 m pitch to 2 m pitch.

As described in detail above, according to the inventions of claims 1 to 9, the solidifying material can be effectively permeated and diffused into the surrounding ground, and deterioration and damage of the chemical injection device due to ultrasonic vibration can be prevented. Can be done. In particular, according to the inventions of claims 1 to 3, the maintainability and costability of the apparatus can be improved. In particular, according to the inventions of claims 4 to 6, the durability of the device, workability at the time of insertion, and the like can be improved. In particular, according to the invention of claim 7, the durability of the device can be improved. In particular, according to the invention of claim 8, the operational stability and durability of the apparatus can be improved.

Each device used in the vibration combined chemical injection method of the embodiment embodying the present invention is schematically shown, and (a) and (b) are side views of a known injection outer tube and chemical injection device, respectively. , (C) are side views of the vibration combined chemical injection device of the present embodiment. (A) schematically shows the state at the time of drug solution injection when the drug solution injection device is inserted into the injection outer tube shown in FIG. 1 and (b) is the case where the drug solution injection device with vibration is inserted into the injection outer tube. It is a schematic cross-sectional view. (A) is a schematic perspective view showing an ultrasonic vibration generating part in the vibration combined chemical injection device of the present embodiment, and (b) is a schematic perspective view showing the ultrasonic vibration generating part before improvement. It is a partially broken sectional view which shows the ultrasonic vibration generation part in the vibration combined chemical solution injection device of this embodiment. It is a partial side view which shows the ultrasonic vibration generation part in the vibration combined drug solution injection device of this embodiment. (A) is a cross-sectional view showing the tip member of the present embodiment provided at the ultrasonic output end of the ultrasonic resonator, and (b) to (f) are cross-sectional views showing a modified example thereof. It is a figure which shows typically an example of the vibration combined chemical solution injection method by this embodiment performed using each apparatus shown in FIG. Similarly, it is a figure which outlines an example of the chemical solution injection method with vibration according to this embodiment.

Hereinafter, an ultrasonic vibration combined chemical injection device and a construction method using the same will be described in detail with reference to the drawings.

The ultrasonic vibration combined chemical injection device (hereinafter abbreviated as "vibration combined chemical injection device") and its construction method according to the present invention are described in the double tube double packer chemical injection method (hereinafter abbreviated as "double packer chemical injection method"). Ultrasonic vibration is also used. The present invention presents a novel vibration-combined chemical injection device that can be used in combination with a conventional chemical injection device in the double-packer chemical injection method, and also performs a double-packer chemical injection method using this vibration-combined chemical injection device. The ultrasonic vibration combined chemical injection method (hereinafter abbreviated as "vibration combined chemical injection method") is presented.

The construction procedure of the known double packer chemical injection method varies depending on the construction conditions such as the ground condition, but the present invention will be described below by taking a typical construction procedure as an example. However, the application target of the present invention is not limited to the typical construction procedure illustrated.

FIG. 1 schematically shows each device used in the vibration-combined chemical injection method of the present embodiment, and (a) and (b) are side views of a known injection outer tube and chemical injection device, respectively. (C) is a side view of the vibration-combined chemical injection device of the present embodiment. FIG. 2A schematically shows a state at the time of chemical injection when the chemical injection device is inserted into the injection outer tube shown in FIG. 1 and FIG. 2B is a case where the vibration-combined chemical injection device is inserted into the injection outer tube. It is a schematic cross-sectional view shown in.

As shown in FIG. 1A, the injection outer tube 1 has an outer tube main body 11 which is a long tube body, and a plurality of chemical liquid discharge portions 15 are spaced apart from each other in the axial direction of the outer tube main body 11. Is formed of. Conventionally, the distance between the adjacent chemical liquid discharge portions 15 is about 250 to 330 mm, but in the present invention, it can be about 1000 mm. This is due to the effect of combined vibration, which will be described later. The outer tube main body 11 is made of a synthetic resin such as polyvinyl chloride. FIG. 1A shows only one chemical liquid discharging portion 15. The chemical liquid discharge unit 15 has a plurality of discharge holes 12 penetrating the pipe wall of the outer pipe main body 11 and a sleeve 13 that covers the discharge holes 12 and is wound on the outer peripheral surface. The plurality of discharge holes 12 are bored in a row at appropriate intervals in the circumferential direction. The sleeve 13 is formed, for example, by a heat shrink tube.

A plurality of slits 14 are bored in the sleeve 13 at appropriate intervals in the circumferential direction. In the illustrated example, the slits 14 of the sleeve 13 are provided in two rows above and below the position facing the discharge hole 12. The upper and lower ends of the sleeve 13 are hermetically fixed to the outer peripheral surface of the outer tube main body 11 by an appropriate caulking member.

Although not shown, contrary to the example of FIG. 1A, a plurality of discharge holes 12 of the outer pipe main body 11 are provided in two rows at predetermined intervals in the vertical direction, while the two rows of discharge holes are provided. The plurality of slits 14 of the sleeve 13 covering the 12 may be provided in a row in the middle of the positions facing the discharge holes 12 in the two rows. The arrangement of the discharge hole 12 of the outer pipe body 11 and the slit 14 of the sleeve 13 is not limited to these examples.

The configuration of the chemical discharge portion 15 of the injection outer pipe 1 used in the vibration combined chemical injection method according to the present invention is not limited to the illustrated example, and any configuration of the injection outer pipe of the known double packer chemical injection method can be adopted.

FIG. 1B shows a portion near the lower end of the chemical solution injection device 2 inserted into the injection outer tube 1. The chemical injection device 2 is in a known double packer chemical injection method. As shown in FIGS. 1 (b) and 2 (a), the chemical solution injection device 2 of the present embodiment has an injection tube main body 21 which is a long tube for pumping the chemical solution, and the lower end thereof. An appropriate number of discharge ports 24 are bored in the vicinity. An upper packer 22 (base end side packer) is attached to the upper side of the discharge port 24, and a lower packer 23 (tip end side packer) is attached to the lower side. The upper packer 22 and the lower packer 23 are formed of, for example, an elastic material that can expand and contract by entering and exiting a medium of air or a chemical solution. Although not shown, a transmission pipe for a medium that expands and contracts the upper packer 22 and the lower packer 23 is internally installed or provided in the injection pipe main body 21.

As the specific configuration of the upper packer 22 and the lower packer 23 of the chemical solution injection device 2 in the vibration-combined chemical injection method according to the present invention, any configuration of the known chemical solution injection device of the double packer chemical injection method can be adopted.

FIG. 1 (c) shows a portion near the lower end of the vibration-combined chemical injection device 3 of the present invention inserted into the injection outer tube 1. As shown in FIGS. 1 (c) and 2 (b), the vibration-combined chemical injection device 3 of the present embodiment is an injection tube main body 31 which is a long tube for pumping the chemical solution which is a solidifying material. Has. An appropriate number of discharge ports 34 are bored in the vicinity of the lower end of the injection pipe main body 31. An upper packer 32 (base end side packer) is attached to the upper side of the discharge port 34, and a lower packer 33 (tip side packer) is attached to the lower side of the discharge port 34.

FIG. 3A is a schematic perspective view showing an ultrasonic vibration generating unit 4 in the vibration combined chemical injection device 3, and FIG. 3B is a schematic perspective view showing the ultrasonic vibration generating unit 4 before improvement. .. FIG. 4 is a partially cutaway sectional view showing the ultrasonic vibration generating portion 4, and FIG. 5 is a partial side view showing the ultrasonic vibration generating portion 4.

As shown in FIG. 2 and the like, the ultrasonic vibration generating unit 4 is provided between the upper packer 32 and the lower packer 33. Further, as shown in FIGS. 2, 3 (a), 4 and the like, the ultrasonic vibration generating unit 4 of the present embodiment includes an ultrasonic generation unit 41, a booster 42 (ultrasonic amplifier), and a horn 43 (ultrasonic amplifier). It is composed of a sound wave resonator) and the like, and ultrasonic waves are generated by these. The ultrasonic wave generation unit 41 preferably includes a piezoelectric element as an oscillator, and generates ultrasonic waves by applying a high frequency voltage transmitted from an oscillator (installed on the ground surface). The electrical wiring for high-frequency voltage transmission is preferably installed internally or provided in the injection pipe main body 31. An oscillator other than the piezoelectric element may be used as long as it can generate ultrasonic waves having the required output and frequency.

The booster 42 amplifies the amplitude of the ultrasonic waves generated by the ultrasonic wave generation unit 41, for example, several times, and transmits the ultrasonic waves to the horn 43. Since a part of the booster 42 and the entire horn 43 are exposed to strong ultrasonic waves in the presence of a chemical solution in the surroundings, if they are inferior in corrosion resistance, they will be severely eroded. Therefore, hard and rust-resistant materials are used for these members, and for example, stainless steel is often used.

As shown in FIGS. 2, 3 (a), 4 and 5, the ultrasonic wave generation unit 41, the booster 42 and the horn 43 are arranged from the upper packer 32 side on the central axis L1 of the injection tube main body 31. They are arranged in order, and the lower end of the horn 43 is the ultrasonic output end. In the present embodiment, the output of ultrasonic waves is not particularly limited, but for example, 200 W to 300 W is suitable. Further, the frequency of the ultrasonic wave is not particularly limited, but for example, 10 kHz to 30 kHz is preferable. In addition, although ultrasonic waves are generally set to 20 kHz or higher, the present invention also includes ultrasonic waves between 10 kHz and 20 kHz.

As shown in FIGS. 2 and 5, the ultrasonic diffuser 44 is arranged on the central axis L1 at a position separated downward by a predetermined distance from the ultrasonic output end of the horn 43. .. The ultrasonic diffuser 44 plays a role of reflecting the ultrasonic waves emitted by the horn 43 and diffusing them in the radial direction of the injection tube main body 11. The ultrasonic diffuser 44 is made of, for example, a stainless steel member and has a conical portion having an inclination of 45 °. The apex of the conical portion of the ultrasonic diffuser 44 is arranged so as to face the ultrasonic output end of the horn 43.

The ultrasonic diffuser 44 prevents the ultrasonic waves output from the horn 43 from propagating to the tip side thereof, so that a member near the lower end of the device (for example, an elastic material of the lower packer 33) is ultrasonically generated. Prevents deterioration and damage. Further, the ultrasonic diffuser 44 prevents the horn 43 from being deteriorated and damaged by the ultrasonic waves by preventing the ultrasonic waves from being reflected toward the horn 43 and returning. The ultrasonic diffuser 44 itself is consumed by being exposed to ultrasonic vibration, but in that case, it is only necessary to replace it with a new one.

As shown in FIGS. 3A and 4 and the like, the horn 43 of the present embodiment has a structure in which a large diameter portion 43a and a small diameter portion 43b are provided via a flange portion 43c. On the other hand, the booster 42 of the present embodiment also has a structure in which a large diameter portion 42a and a small diameter portion 42b are provided via a flange portion 42c. In the present embodiment, the horn 43 and the booster 42 are configured to form an integral structure using the same metal material (for example, stainless steel). That is, the base end surface of the large diameter portion 43a of the horn 43 and the small diameter portion 42b of the booster 42 are integrally inseparable. On the other hand, the one before improvement shown in FIG. 3B is different in that the horn 43 and the booster 42 are originally configured as separate bodies, and they are connected to each other by screwing. To do.

Further, as shown in FIGS. 3 (a), 4 and the like, the ultrasonic vibration generating unit 4 of the present embodiment air-tightly accommodates the entire ultrasonic vibrator unit 41 in the internal space 48. It has. The vibrator case 40 of the present embodiment is a cylindrical bottomed member made of a material such as stainless steel, and is formed in a size capable of accommodating the ultrasonic vibrator unit 41. The opening of the vibrator case 40 is firmly joined to the flange portion 42c of the booster 42 over the entire circumference by welding, for example. If both can be firmly fixed to each other, a method other than welding may be adopted.

As shown in FIG. 3 and the like, a pipe holding groove 62 is recessed at one location on the outer peripheral surface of the vibrator case 40 so as to extend linearly along the longitudinal direction of the vibrator case 40. A pipe insertion recess 64 having a substantially U-shaped cross section is provided at the same position on the outer circumference of the pipe holding groove 62 in the flange portion 42c of the booster 42. An air supply pipe 61 for the tip side packer 33 is immovably held and fixed in the pipe holding groove 62 and the pipe insertion recess 64. The air supply pipe 61 may be joined to the inner wall surface of the pipe holding groove 62 by using, for example, an adhesive or the like. The air supply pipe 61 used in the present embodiment is made of metal (preferably made of stainless steel) and has a straight shape. The depth of the pipe holding groove 62 is not particularly limited as long as the air supply pipe 61 can be held and fixed, but in the present embodiment, the air supply pipe 61 does not protrude from the outer peripheral surface of the vibrator case 40 in the pipe holding state. It is set to depth. On the other hand, the one before improvement shown in FIG. 3B is different in that the air supply pipe 61 is arranged in a bent state because it does not have the pipe holding groove 62. ..

Further, as shown in FIG. 3 and the like, the flange portion 43c of the horn 43 is formed so as to have an outer diameter equal to that of the flange portion 42c of the booster 42, and the pipe holding groove 62 and the pipe insertion recess 64 are on the outer circumference. It has a pipe insertion recess 63 at the same position. Then, the air supply pipe 61 connected to the tip side packer 33 is inserted into the pipe insertion recess 63. On the other hand, in the one before improvement shown in FIG. 3B, the pipe insertion recess 63 is not provided in the flange portion 43c of the horn 43. Therefore, the difference is that the air supply pipe 61 for the tip side packer 33 is arranged through the outer peripheral side of the flange portion 43c.

As shown in FIGS. 3 (a), 5 and the like, mounting holes 46 for mounting the support columns 45 (support members) are provided at a plurality of positions in the flange portion 43c of the horn 43. One end side of the support pillar 45 is connected and fixed to these mounting hole portions 46, and the other end side is connected and fixed to the lower packer 33. Although not shown, the upper packer 32 is connected and fixed to the base end surface of the vibrator case 40 via a support member.

The waveform of the ultrasonic wave generated by the ultrasonic vibration generating unit 4 is shown on the left side portion of FIG. 5, and the node of the ultrasonic vibration in the waveform is shown by F1 and the antinode is shown by H1. In the right side portion of FIG. 5, the point indicated by P0 is the tip position of the ultrasonic vibration generating portion 4, and the point indicated by P1 is the connecting position between the base end surface of the lower packer 33 and the support pillar 45, and P2. The point indicated by is the connection position between the support column 45 and the flange portion 43c of the horn 43 described above, the point indicated by P3 is the boundary position between the horn 43 and the booster 42, and the point indicated by P4 is the booster 42. This is the connection position between the flange portion 42c and the vibrator case 40. Then, among these positions P0 to P4, the energy of the ultrasonic vibration is maximized at P0, so that position is the position of the antinode H1. Further, P3 in which the separate members are not connected to each other is arranged corresponding to the position of the belly H1. On the other hand, P1, P2, and P4 in which the separate members are connected to each other are arranged corresponding to the positions where the nodes F1 are formed, in other words, the positions where the energy of ultrasonic vibration is minimized.

As shown in FIGS. 3 (a), 6 (a) and the like, in the present embodiment, the ultrasonic output end of the horn 43 (that is, the tip surface of the small diameter portion 43b) is provided to protect the ultrasonic output end. The tip member 51 of the above is detachably connected. The tip member 51 is, for example, a stainless steel member, which has the same diameter as the small diameter portion 43b and is formed in a columnar shape, and the tip surface 52 thereof is a flat surface. Various structures can be adopted as means for detachably connecting the tip member 51 and the small diameter portion 43b, but in the present embodiment, a screw structure is adopted. Specifically, a male screw portion 53 is projected from the central portion of the base end surface of the tip member 51, and the male screw portion 53 is screwed to a female screw portion 54 provided on the small diameter portion 43b side.

As shown in FIG. 4 and the like, the introduction pipe 71 and the discharge pipe 72 extending from the base end side of the injection pipe main body 31 on the ground surface are connected to the base end side of the vibrator case 40, respectively. The introduction pipe 71 plays a role of introducing air (cooling gas) for cooling the ultrasonic vibrator unit into the internal space 48 of the vibrator case 40 from the base end side of the injection pipe main body 31. On the other hand, the discharge pipe 72 plays a role of returning the air introduced into the internal space 48 to the proximal end side of the injection pipe main body 31 via a route different from that of the introduction pipe 71 and discharging the air. A pump 74, which is an air supply means, is connected to the introduction pipe 71 exposed on the ground surface side, and air is pumped to the introduction pipe 71 by driving the pump 74. Further, a temperature sensor 76 is provided in the introduction pipe 71 exposed on the ground surface side so as to measure the temperature of the introduced air. On the other hand, the discharge pipe 72 exposed on the ground surface side is also provided with a temperature sensor 73 to measure the temperature of the discharged air. Further, the pump 74 and the temperature sensors 73 and 76 are both electrically connected to the computer 75 which is a control means. The computer 75 takes in the output signals from the temperature sensors 73 and 76 and constantly monitors the temperature, and the operation of the pump 74 is appropriately controlled based on the measurement result. For example, when the difference between the gas temperature at the time of discharge and the gas temperature at the time of introduction is within an allowable range, the computer 75 basically controls to drive the pump 74 at a constant rotation speed. On the other hand, when the temperature difference exceeds the permissible range due to an excessive rise in the gas temperature at the time of discharge, the computer 75 controls to increase the rotation speed of the pump 74 to drive the pump 74. That is, the control is performed so as to increase the amount of air supplied to increase the cooling capacity.

Next, a chemical injection method using the injection outer tube 1, the chemical injection device 2, and the vibration-combined chemical injection device 3 of the present embodiment will be described.

In the known double packer chemical injection method, the injection outer tube 1 and the chemical injection device 2 of FIGS. 1A and 1B are used. On the other hand, in the vibration-combined chemical injection method according to the present invention, the injection outer tube 1, the chemical injection device 2, and the vibration-combined chemical injection device 3 are used.

In FIG. 2A, the chemical injection device 2 is inserted into the injection outer pipe 1 built in the drilling hole (not shown) in the ground, and the upper and lower packers 22 and 23 are expanded at predetermined positions. It is in a state of being closely fixed to the inner peripheral surface of the injection outer tube 1. At this time, the upper packer 22 and the lower packer 23 are positioned above and below the chemical liquid discharge portion 15 for discharging the chemical liquid C1.

When the chemical solution C1 is pumped through the injection pipe main body 21 and the chemical solution C1 is discharged from the discharge port 24, the chemical solution C1 is filled in the space closed by the upper packer 22 and the lower packer 23, and the pressure inside the pipe is increased. As a result, the chemical solution C1 is discharged by pushing open the slit 14 through the discharge hole 12.

Similarly, in FIG. 2B, the vibration-combined chemical injection device 3 is inserted into the injection outer pipe 1 built in the drilling hole (not shown) in the ground, and the upper and lower packers 32 and 33 are placed at predetermined positions. Is inflated and closely fixed to the inner peripheral surface of the injection outer tube 1.

The chemical solution C2 is pumped through the injection pipe main body 31, the chemical solution C2 is discharged from the discharge port 34, and the chemical solution C2 is filled in the space closed by the upper packer 32 and the lower packer 33. At the same time, the operation of the ultrasonic vibration generating unit 4 is started. The ultrasonic waves generated by the ultrasonic wave generation unit 41 are amplified by the booster 42 and radiated from the ultrasonic wave output end of the horn 43. Ultrasound is a longitudinal wave that oscillates in the same direction as the propagation direction. The ultrasonic vibration that reaches the injection outer tube 1 through the chemical solution C2 vibrates the injection outer tube 1 (the sleeve 13 is also integrated). The vibration of the injection outer pipe 1 is transmitted to the surrounding ground, and the soil particles in the ground also vibrate.

Further, the chemical solution C2 itself is also discharged by pushing the slit 14 through the discharge hole 12 while the particles vibrate. Since the moving direction of the chemical solution C2 toward the discharge hole 12 is the same as the propagation direction and the vibration direction of the ultrasonic wave, the particles in the chemical solution C2 are likely to vibrate.

In the present invention, as a result of the combined use of vibration, columnar permeation is promoted in place of or in addition to spherical permeation in the conventional double packer chemical injection method. In the surrounding ground, the particles in the chemical solution C2 and the soil particles move while vibrating, so that the chemical solution C2 can enter the soil particle gaps and permeate into the ground without clogging the soil particle gaps. .. Since the chemical solution C2 can move until it hardens, the longer the curing time, the farther it can reach.

When the chemical solution C1 and the chemical solution C2 have the same type and viscosity, the chemical solution can reach farther when the chemical solution injection device 3 with vibration is used than when the chemical solution injection device 2 is used.

With reference to FIGS. 7 and 8, an example of the vibration-combined chemical injection method according to the present invention performed by using each device shown in FIG. 1 will be schematically described.

The process up to the state shown in FIG. 7A will be described. First, a hole 9 is formed in the ground G. For example, using a casing pipe having a diameter of about 100 mm to 165 mm, the casing is drilled to a predetermined depth, which is the bottom position of the chemical solution injection target range. The injection outer pipe 1 is built in the drilled hole 9, and the casing pipe is pulled out at the same time as the seal grout C0 is injected. Shield grout C0 is, for example, a cement / bentonite solution. Then, the seal grout C0 is cured until its strength is developed. The solidification of the seal grout C0 prevents the chemical solution from leaking from the periphery of the injection outer tube 1 to the ground in the subsequent chemical solution injection step.

FIG. 7A shows an injection outer pipe 1 built in the drilled hole 9. There is a seal grout C0 having a predetermined strength in the surroundings. The inside of the injection outer tube 1 is hollow.

Next, FIG. 7B shows a state in which the chemical injection device 2 is inserted into the injection outer tube 1 and fixed at a predetermined position. At the time of insertion, the upper packer 22 and the lower packer 23 are brought into a contracted state. A material mixing mixer 7 for mixing chemical liquid materials and a grout pump 6 for supplying chemical liquid from the material mixing mixer 7 are installed on the ground surface, and the grout pump 6 is connected to the chemical liquid injection device 2.

Media delivery pumps (not shown) for the two packers 22 and 23 are also installed. After the upper packer 22 and the lower packer 23 are positioned vertically with the chemical discharge portion 15 at the lowest position interposed therebetween, both packers 22 and 23 are expanded and fixed in close contact with the inner peripheral surface of the injection outer tube 1. ..

Subsequently, FIG. 8A shows a state in which the primary chemical solution C1 is pumped to the chemical solution injection device 2 and injected into the ground G. The primary chemical solution C1 is, for example, a cement / bentonite solution having a relatively high viscosity. The injection of the primary drug solution C1 is performed as shown in FIG. 7 (a) described above. The primary chemical solution C1 cracks the seal grout C0 around the injection outer tube 1 and the surrounding ground in the vicinity thereof. The surrounding ground is roughly filled by cracking the surroundings with the primary chemical solution C1 and permeating the primary chemical solution C1 into the cracking.

When the injection of the primary chemical solution C1 at one location in the axial direction is completed, the packers 22 and 23 are released, the chemical solution injection device 2 is pulled up by a predetermined distance, and the primary chemical solution C1 is repeatedly injected at the next chemical solution discharge unit 15. Make an injection. After the injection of the primary chemical solution C1 is completed in all the chemical solution discharge units 15 in the chemical solution injection target range, the chemical solution injection device 2 is pulled out.

Subsequently, FIG. 8B shows a state in which the vibration-combined chemical injection device 3 is inserted into the injection outer tube 1, fixed at a predetermined position, and the chemical solution as the solidifying material C2 is injected. The fixing position of the vibration-combined chemical injection device 3 with respect to the injection outer tube 1 and the fixing method by the packers 32 and 33 are the same as those of the chemical injection device 2. The solidifying material C2 is injected by the vibration-combined chemical injection device 3 as shown in FIG. 8B described above. In the chemical solution injection device 3 combined with vibration, ultrasonic vibration is used in combination, but since pulsation to a visible degree does not occur at the injection pressure, it is easy to control the injection pressure tendency.

The ultrasonic vibration generating unit 4 is driven by a high frequency voltage transmitted from an oscillator 5 installed on the ground surface to generate ultrasonic waves. When the generation of ultrasonic waves is started, the ultrasonic vibration propagates to the ground around the injection outer pipe 1, the ground in the vicinity of the drilled hole 9 is loosened, and the loosened region S is formed. The loosened region S becomes a cylindrical permeation surface, and the solidifying material C2 can permeate radially in a substantially horizontal direction with a small injection resistance. That is, columnar permeation is promoted in place of or in addition to spherical permeation in the conventional double packer chemical injection method. In columnar infiltration by a surface infiltration source, the discharged chemical solution is more widely dispersed than in spherical infiltration by a point infiltration source. By lowering the injection resistance per unit volume of the permeation surface, the injection speed can be increased and the construction time can be shortened. However, the permeation modes of spherical permeation by the point permeation source and columnar permeation by the surface permeation source are model expressions, and there is no strict boundary between them, and both permeation modes are actually mixed. In some cases.

Further, since the penetration resistance in the vertical direction is also relaxed by vibration, the injection interval in the axial direction can be changed from the conventional 250 mm to 330 mm to about 1000 mm. This also makes it possible to reduce the construction time and work load.

Since the ultrasonic vibration is a minute vibration and not a large pulsation that can be visually recognized, the solidifying material C2 does not spread the same split vein many times to create an uneven improved body. That is, the solidifying material C2 can smoothly and uniformly permeate without causing split injection.

The ultrasonic vibration generating unit 4 basically operates throughout the injection of the solidifying material C2. However, the substantial generation of ultrasonic waves may be continuous or intermittent. Preferably, the ultrasonic waves are generated intermittently. For example, it is preferable that the ultrasonic vibration generating unit 4 intermittently generates ultrasonic waves by repeating an operating time of 1 minute to 10 minutes and a resting time of 1 minute to 10 minutes. At this time, it is preferable to set the rest time based on the sedimentation time of the soil particles according to the particle size of the target ground. When ultrasonic waves are generated intermittently, the vibration applied to the soil particles and solidifying material particles is further slowed down as compared with the case where ultrasonic waves are continuously generated, so that clogging of the soil particle gaps is less likely to occur. The effect of removing the generated clogging can also be obtained. The period in which ultrasonic waves are generated intermittently and the period in which ultrasonic waves are continuously generated for 10 minutes or more may be combined.

The solidifying material C2 is a low-viscosity material having a relatively long curing time, and for example, a solution type can be used. In addition, since it is used in combination with vibration, a suspension type (slurry) cement-based grout with relatively low permeability can also be used. Even if the solidifying material C2 has a long curing time, it can permeate into the ground because the surrounding seal grout C0 and the packers 32 and 33 block the leakage to the ground. The type and viscosity of the solidifying material C2 are appropriately selected depending on the soil condition.

The injection rate of the solidifying material C2 is, for example, about 6 liters / minute to 20 liters / minute. Injection at a low injection rate is preferable because it has little effect on the surrounding ground. However, the injection rate is not limited to this range. When the injection of the solidifying material C2 at one location in the axial direction is completed, the packers 32 and 33 are released, the vibration-combined chemical injection device 3 is pulled up by a predetermined distance, and the solidifying material is repeatedly injected at the next chemical discharge unit 15. Inject C2. After the injection of the solidifying material C2 is completed in all the chemical discharge portions 15 in the chemical solution injection target range, the vibration-combined chemical solution injection device 3 is pulled out.

After that, move to the next construction site and perform the same construction.

A feature of the double packer chemical injection method is that it is easy to arbitrarily change the vertical position of the chemical injection device and to perform injection again at the same location. Therefore, the vibration-combined chemical injection method using the vibration-combined chemical injection device according to the present invention is not limited to the above-mentioned construction examples, and various constructions are possible. The target ground can be applied to any ground such as silt clay layer, sandy soil, and gravel layer.

Then, according to the vibration combined chemical injection device 3 of the present embodiment and its construction method, the following effects can be obtained.

(1) In the present embodiment, the tip member 51 is detachably connected to the ultrasonic output end of the horn 43. Therefore, even if deterioration damage occurs on the ultrasonic output end side due to erosion, only the tip member 51 can be replaced with a new one. Therefore, it is not necessary to replace the entire horn 41 or the entire ultrasonic vibration generating unit 4 including the horn 41 with a new one, and maintainability is improved. Further, the work of replacing only the tip member 51 does not necessarily involve disassembly, assembly, adjustment, or the like. Therefore, it does not require complicated equipment and can be performed at the work site if there is a relatively simple tool or the like. It should be noted that the costability is surely improved as compared with the case where the entire horn 41 needs to be renewed.

(2) In the present embodiment, since the ultrasonic vibrator unit 41 is airtightly housed in the internal space 48 of the vibrator case 40, the ultrasonic vibrator unit 41 may be directly exposed to the surrounding chemical solution. Absent. Therefore, deterioration and damage of the ultrasonic vibrator unit 41 are avoided. Further, a pipe holding groove 62 is recessed on the outer peripheral surface of the vibrator case 40, and the air supply pipe 62 for the tip side packer 33 is held and fixed therein. Therefore, even if it is repeatedly exposed to ultrasonic vibration, the air supply pipe 62 is unlikely to be deformed or damaged. Further, as a result of the air supply pipe 62 entering the outer peripheral surface of the vibrator case 40 and being held and fixed, the air supply pipe 62 does not project in the radial direction. Therefore, the air supply pipe 62 does not get in the way when the ultrasonic vibration generating portion 4 is inserted into the injection outer pipe 11. Therefore, the insertion work can be easily performed. Further, in this case, it is not necessary to dispose the air supply pipe 62 so as to avoid the vibrator case 40. Therefore, the air supply pipe 62 can be used in a straight state without being bothered to bend at the vibrator case 40 portion. Further, it is not necessary to secure a pipe installation space between the outer peripheral surface of the vibrator case 40 and the inner peripheral surface of the injection outer pipe 11. Therefore, it is possible to use the ultrasonic vibration generating unit 4 which is larger by that amount. Further, in the present embodiment, since the air supply pipe 62 is made of metal, there is an advantage that damage or the like is less likely to occur as compared with the case where the air supply pipe 62 is made of resin, for example.

(3) In the present embodiment, the booster 42 and the horn 43 are configured to form an integral structure, and the vibrator case 40 and the horn 42 are welded together. Therefore, there is no concern that the pipe insertion recesses 63 and 64 in the flange portions 42c and 43c will be displaced from the same position on the outer circumference as the pipe holding groove 62 at the time of assembly. Therefore, the air supply pipe 61 for the tip side packer 33 can be easily and surely inserted into both the pipe insertion recesses 63 and 64, and the assembling property is improved. Further, even in this case, the air supply pipe 61 can be used in a straight state without being bothered to bend. Further, if the air supply pipe 61 is also held and fixed in the pipe insertion recesses 63 and 64 in the flange portions 42c and 43c, the fixing strength of the air supply pipe 61 can be further increased, and the durability is further improved. be able to.

(4) In the present embodiment, both ends of the support pillar 45 that supports the tip side packer 33 are connected and fixed at positions that serve as the ultrasonic vibration node F1 in the ultrasonic vibration generating portion 4. Therefore, the influence of ultrasonic vibration on the connecting portion between the members can be minimized, and the durability of the device is improved.

(5) In the present embodiment, the introduction pipe 71 and the discharge pipe 72 are connected to the vibrator case 40. Therefore, the heat of the ultrasonic vibrator unit 41 is taken away by the cooling gas introduced through the introduction pipe 71. The high-temperature cooling gas is surely returned to the proximal end side of the injection pipe main body 31 through the discharge pipe 72 provided in a different route from the introduction pipe 71, and is discharged. Therefore, the ultrasonic vibrator unit 40 can be efficiently cooled even if there is not enough space in the vicinity of the ultrasonic vibrator unit 40. Therefore, the operational stability of the device is improved, and the durability is also improved.

In addition, each embodiment of the present invention may be changed as follows.

In the above embodiment, the tip member 51 as shown in FIG. 3A is used, but the screw structure is not necessarily limited as long as the tip member 51 can be attached and detached. For example, in the modified example shown in FIG. 3B, a female screw portion 54 is provided at the center of the base end surface of the tip member 51A, and the female screw portion 54 has a male screw portion 53 projecting from the small diameter portion 43b side. It is screwed. In the modified example shown in FIG. 3C, a female screw portion 54 is provided on both the tip member 51B and the small diameter portion 43b, and a male screw member 53B configured as a separate body is screwed to each of the female screw portions 54. ing. Although not shown, it is of course possible to adopt, for example, a connecting structure using a locking tool in addition to the above-mentioned screw structure.
-For example, as in the modified example shown in FIG. 6D, the tip surface 52 of the tip member 51 may be covered with the corrosion-resistant protective film 55. As such a corrosion-resistant protective film 55, for example, a chrome-plated film or a titanium nitride film having a size of about 10 μm to 100 μm is suitable. By applying such a film, the tip member 51 is less likely to be eroded. Therefore, the life of the tip member 51 can be extended by about 1.5 to 2 times as compared with the case of FIG. 6A, and the frequency of replacement of the tip member 51 can be reduced. As in the modified example shown in FIG. 6E, not only the tip surface 52 of the tip member 51 but also the entire side surface may be covered with the corrosion-resistant protective film 55. The corrosion-resistant protective film 55 is not limited to the one formed by the plating method, and may be formed by another conventionally known film forming method. Further, the corrosion resistant protective film 55 does not have to be a metal film, and may be, for example, a ceramic film.
In the above embodiment, the tip surface 52 of the tip member 51 is flat, but the tip surface 52A may be convex as in the modified example tip member 51C shown in FIG. 3 (f). With such a configuration, the ultrasonic waves are easily dispersed in the radial direction, so that the amount of ultrasonic vibration propagating to the ultrasonic diffuser 43 is reduced, and the deterioration of the ultrasonic diffuser 43 can be delayed. Although not shown, the tip surface may be concave.
-In the above embodiment, the computer 75 is configured to appropriately control the operation of the pump 74 based on the temperature measurement results by the temperature sensors 73 and 76, but the computer 75 is not limited to the pump 74 and is also provided on the ground surface. The oscillator may be the control target.

1 ... Injection outer tube 3 ... Chemical injection device with ultrasonic vibration 4 ... Ultrasonic vibration generator 9 ... Drilling 24 ... Discharge port 31 ... Injection tube body 32 ... Upper packer as base end side packer 33 ... As tip side packer Lower packer 40 ... Transducer case 41 ... Ultrasonic transducer unit 42 ... Booster as an ultrasonic amplifier 43 ... Horn as an ultrasonic resonator 43c ... Collar part (of ultrasonic resonator) 44 ... Ultrasonic diffuser 45 ... Support pillar as a support member 48 ... Internal space 51, 51A, 51B, 51C ... Tip member 52, 52A ... Tip surface 55 ... Corrosion-resistant protective film 61 ... Air supply pipe for tip side packer 62 ... Pipe holding groove 71 ... Introduction Pipe 72 ... Discharge pipe C2 ... Solidifying material G ... Ground F1 ... Position that becomes a node of ultrasonic vibration L1 ... Central axis

Claims (9)

It is a chemical injection device with ultrasonic vibration used in the double packer chemical injection method that also uses ultrasonic vibration.
In order to discharge the injection tube main body, the base end side packer and the tip end side packer provided at the tip of the injection tube body at a predetermined interval in the axial direction, and the solidifying material pumped through the injection tube main body. It is provided with a discharge port provided between the base end side packer and the tip end side packer, and an ultrasonic vibration generating portion provided between the base end side packer and the tip end side packer.
The ultrasonic vibration generating unit includes an ultrasonic vibrator unit, an ultrasonic amplifier, an ultrasonic resonator, and an ultrasonic resonator arranged in order from the base end side packer side on the central axis of the injection tube main body. It has an ultrasonic diffuser that is arranged on the central axis away from the ultrasonic output end of the above and reflects the ultrasonic waves and diffuses in the radial direction of the injection tube main body.
An ultrasonic vibration combined chemical injection device, characterized in that a tip member is detachably connected to the ultrasonic output end of the ultrasonic resonator. The chemical injection device combined with ultrasonic vibration according to claim 1, wherein at least the tip surface of the tip member is covered with a corrosion-resistant protective film. The chemical solution injection device combined with ultrasonic vibration according to claim 1 or 2, wherein the tip surface of the tip member has a convex shape. It is a chemical injection device with ultrasonic vibration used in the double packer chemical injection method that also uses ultrasonic vibration.
In order to discharge the injection tube main body, the base end side packer and the tip end side packer provided at the tip of the injection tube body at a predetermined interval in the axial direction, and the solidifying material pumped through the injection tube main body. It is provided with a discharge port provided between the base end side packer and the tip end side packer, and an ultrasonic vibration generating portion provided between the base end side packer and the tip end side packer.
The ultrasonic vibration generating unit includes an ultrasonic vibrator unit, an ultrasonic amplifier, an ultrasonic resonator, and an ultrasonic resonator arranged in order from the base end side packer side on the central axis of the injection tube main body. The ultrasonic diffuser, which is arranged on the central axis away from the ultrasonic output end of the above and reflects the ultrasonic waves and diffuses in the radial direction of the injection tube body, and the ultrasonic vibrator unit are airtight in the internal space. Has a vibrator case to be accommodated in
An ultrasonic vibration combined chemical injection device characterized in that a pipe holding groove is recessed on the outer peripheral surface of the vibrator case and an air supply pipe for the tip side packer is held and fixed in the pipe holding groove. .. The ultrasonic amplifier and the ultrasonic resonator are configured to form an integral structure.
The super-super according to claim 4, wherein the air supply pipe for the tip-side packer is inserted into a flange portion of the ultrasonic resonator arranged at the same position on the outer periphery of the pipe holding groove. Chemical injection device with sonic vibration. The oscillator case and the ultrasonic resonator are welded and joined,
The fourth or fifth aspect of claim 4 or 5, wherein the air supply pipe for the tip side packer is inserted into a flange portion of the ultrasonic resonator arranged at the same position on the outer periphery of the pipe holding groove. Ultrasonic vibration combined chemical injection device. It is a chemical injection device with ultrasonic vibration used in the double packer chemical injection method that also uses ultrasonic vibration.
In order to discharge the injection tube main body, the base end side packer and the tip end side packer provided at the tip of the injection tube body at a predetermined interval in the axial direction, and the solidifying material pumped through the injection tube main body. It is provided with a discharge port provided between the base end side packer and the tip end side packer, and an ultrasonic vibration generating portion provided between the base end side packer and the tip end side packer.
The ultrasonic vibration generating unit includes an ultrasonic vibrator unit, an ultrasonic amplifier, an ultrasonic resonator, and an ultrasonic resonator arranged in order from the base end side packer side on the central axis of the injection tube main body. It has an ultrasonic diffuser that is arranged on the central axis away from the ultrasonic output end of the above and reflects the ultrasonic waves and diffuses in the radial direction of the injection tube main body.
A support member that supports at least the tip side packer among the base end side packer and the tip end side packer is connected and fixed at a position that becomes a node of ultrasonic vibration in the ultrasonic vibration generating portion. Chemical injection device with ultrasonic vibration. It is a chemical injection device with ultrasonic vibration used in the double packer chemical injection method that also uses ultrasonic vibration.
In order to discharge the injection tube main body, the base end side packer and the tip end side packer provided at the tip of the injection tube body at a predetermined interval in the axial direction, and the solidifying material pumped through the injection tube main body. It is provided with a discharge port provided between the base end side packer and the tip end side packer, and an ultrasonic vibration generating portion provided between the base end side packer and the tip end side packer.
The ultrasonic vibration generating unit includes an ultrasonic vibrator unit, an ultrasonic amplifier, an ultrasonic resonator, and an ultrasonic resonator arranged in order from the base end side packer side on the central axis of the injection tube main body. The ultrasonic diffuser, which is arranged on the central axis away from the ultrasonic output end of the above and reflects the ultrasonic waves and diffuses in the radial direction of the injection tube body, and the ultrasonic vibrator unit are airtight in the internal space. Has a vibrator case to be accommodated in
An introduction pipe that introduces a cooling gas for cooling the ultrasonic vibrator unit into the internal space from the base end side of the injection pipe main body, and the cooling gas introduced into the internal space into the injection pipe main body. A chemical injection device with ultrasonic vibration, which is characterized by being provided with a discharge pipe that returns to the base end side of the gas and discharges the gas. A construction method using the chemical injection device according to any one of claims 1 to 8.
The process of forming holes in the ground and
A step of constructing an injection outer pipe in which a plurality of chemical discharge portions are provided at predetermined intervals along the axial direction in the drilling hole, and
A step of inserting the chemical injection device into the injection outer tube and closely fixing the base end side packer and the tip end side packer to the inner peripheral surface of the injection outer tube.
It has a step of discharging a solidifying material from the discharge port while generating ultrasonic waves by the ultrasonic vibration generating portion of the chemical liquid injection device, and infiltrating the solidifying material into the ground through the chemical liquid discharging portion of the injection outer pipe. A double packer chemical injection method characterized by this.