JP5250730B2 - Underground consolidated body construction method and underground solid body creation device for creating a solid body using the method - Google Patents

Description

  The present invention is a high-pressure injection of a hardening material liquid from a nozzle used for ground stabilization, ground support, tunnel support, structure foundation, structure foundation reinforcement, liquefaction prevention, underground wall for water shielding, groundwater spring prevention, etc. The present invention relates to an underground solid body forming method for forming a solid body and an underground solid body forming apparatus for forming a solid body using the method.

Conventionally, as a method of creating a solidified body by injecting a hardened material liquid into the ground, for example, a boring hole is cut in the ground to be improved, and a rod provided with a monitor at the tip is inserted into the boring hole. A ground improvement material (hardening material liquid) jet is jetted from the nozzle provided on the monitor in the horizontal direction to mix the ground with the improvement material, and then mix the ground with the improvement material. There was something that pulled up to the ground side while rotating. Thereby, it can consist of a mixture of a ground and a ground improvement material, and can form the cylindrical solid body (improvement body) which has a radial direction dimension equal to a jet reach | attainment distance (for example, patent document 1).

JP 2001-115442 A ("Conventional Technology" column)

In this way, when the hardening material liquid is injected into the ground, the cut ground and the excess hardening material liquid are discharged as mud, usually along the periphery of the rod, but the ground has a high viscosity. In some cases, it was difficult to discharge the mud to the ground due to the soil (clay ground, etc.) or the ground around the rod collapsed. As described above, when the mud cannot be discharged to the ground, there is a problem that the pressure in the ground is increased and the surrounding ground is raised.

In order to solve this problem, instead of discharging the sludge to the ground around the rod, a discharge passage is provided inside the rod so that the pressure inside the rod becomes the proper pressure at the tip of the rod. There is also a method of discharging waste mud from the discharge passage to the ground while measuring with a provided pressure sensor (omnidirectional high-pressure injection method). However, in the omnidirectional high-pressure injection method, complicated equipment must be used and is expensive, so that there is a problem that the construction cost increases.

  The present invention has been made in view of the above problems, and in the formation of a solid body in the ground, an underground solid body construction method capable of discharging the waste mud in the ground inexpensively and reliably, and An object of the present invention is to provide an underground solid body forming apparatus for forming a solid body using the construction method.

In order to solve the above-mentioned problems and achieve the above object, the first aspect of the present invention includes an insertion step of inserting an injection rod provided with an injection nozzle to a predetermined depth of the target ground, and an injection nozzle an ejection step for high-pressure injection of curable material liquid from an air injection step of injecting the compressed air from the air injection port provided in the side surface of the injection rod, and pull on the gel pulling step the injection rod from the target ground, the has, in the air ejection step, to inject compressed air in the ground direction, both raising the sand on the ground direction by the jet force, pulling the sediment on the ground by the air lift effect, liquefied sand is raised on the ground Rukoto the one in which the features.

In some cases, it may become impossible to discharge the mud to the ground due to the collapse of the ground on the side of the injection rod, but according to the present invention, not only the end of the injection rod but also the end of the injection rod By providing the air injection port on the side surface of the injection rod instead of the section, the earth and sand present on the side surface of the injection rod can be lifted to the ground, and the mud present on the side surface of the injection rod can be discharged smoothly to the ground. As a result, even if the work is in the ground containing gravel or cobblestone or in a deep place, there is no clogging due to ground collapse on the side of the injection rod, and the mud that exists on the side of the injection rod is removed by the air lift effect of compressed air. Can be discharged to the ground more smoothly. In addition, by jetting compressed air in the ground direction, earth and sand present on the side surface of the injection rod are pulled up to the ground along the side surface of the injection rod, and the mud present on the side surface of the injection rod is removed by the air lift effect of the compressed air. It can be discharged smoothly on the ground.

Those according to the second aspect of the present invention is a ground consolidation body Construction method according to the first embodiment, the air injection port is intended, characterized in that provided more on the side surface of the injection rod It is .

According to the present invention, the upper earth is lifted to the ground from the location where the air injection port is provided by the compressed air injected from the plurality of air injection ports provided on the side surface of the injection rod, and is present on the side surface of the injection rod. The discharged mud can be discharged smoothly to the ground by the air lift effect of compressed air. Thereby, since the upper earth and sand are pulled up to the ground from the place where the air injection port is provided, it is possible to prevent the mud from being clogged even near the tip of the injection rod.

According to a third aspect of the present invention, there is provided an underground solid body construction method according to the first or second aspect, wherein in the air injection step, the air injection is performed while rotating or swinging the injection rod. it is characterized in that injects compressed air from the mouth.

According to the present invention, since the compressed air is injected from the air injection port while rotating or swinging the injection rod, the position of the air injection port changes every time the injection rod rotates or swings. Compressed air can be sprayed over a wide range of the side surfaces of the nozzles, and the mud present on the side surfaces of the injection rod can be discharged smoothly to the ground due to the air lift effect of the compressed air.

According to a fourth aspect of the present invention, there is an underground consolidated body construction method according to any one of the first to third aspects, wherein the injection pressure and injection of compressed air injected from an air injection port it is capable of changing at least one of the amount.

According to the present invention, it is possible to prevent the waste mud existing on the side surface of the injection rod from being clogged by changing the injection force of the compressed air injected from the air injection port according to the hardness and soil quality of the natural ground. it can. Also, before the waste mud present on the side surface of the injection rod is likely to be clogged, it is present on the side surface of the injection rod by increasing at least one of the injection pressure and the injection amount of the compressed air injected from the air injection port. It is possible to prevent the mud from clogging.

According to the fifth aspect of the present invention, there is an underground solid body forming device, wherein the solid body is formed using the underground solid body forming method according to any one of the first to fourth aspects. It is to be created.

According to this structure, it has the same effect as the effect of any one of the first to fifth aspects of the present invention described above.

According to a sixth aspect of the present invention, there is provided a ground solid body forming apparatus according to the fifth aspect, provided on the side of the injection rod near the upper portion of the injection nozzle, the pressure in the ground It has a pressure sensor to detect.

  As described above, according to the underground consolidated body construction method of the present invention, by providing the air injection port on the side surface of the injection rod instead of the end portion of the injection rod, the earth and sand existing on the side surface of the injection rod is pulled up to the ground. Therefore, the mud present on the side surface of the injection rod can be smoothly discharged to the ground. As a result, the underground mud can be discharged inexpensively and reliably.

Hereinafter, an embodiment of the underground consolidated body construction method of the present invention will be described with reference to the drawings. Drawing 1 is a figure showing the construction situation of the underground solid body construction method in one embodiment of the present invention.

As shown in FIG. 1, water (liquid) and air supplied from the tip nozzles 101 to 104 provided at the tip of the injection rod 1 and the inside of the injection rod 1 from the air injection port 105 are injected and injected. Cement milk (hardening material liquid) and air supplied from the injection nozzle 13 and the air injection ports 107 and 108 provided on the side surface of the rod 1 through the injection rod 1 are injected. In the present embodiment, water (liquid) is jetted from the tip nozzles 101 to 104, but the present invention is not limited to this, and cement milk may be jetted.

The work machine 2 is a machine that supports the injection rod 1 and moves the injection rod 1 up and down, rotates, and swings. As a result, the injection rod 1 can be rotated and swung as well as the vertical movement by the working machine 2.

As described above, the injection rod 1 is provided with nozzles at the end and side surfaces, and the swivel 3 is attached to the rear end. The injection rod 1 is provided with a cement milk flow path 10, an air flow path 11, and a water flow path 12 for supplying cement milk, air, and water (liquid) to the nozzle.

The swivel 3 is connected to water, air, and cement milk supply pipes 7, 8, and 9 (hose) supplied from a water supply source 4, an air supply source 5, and a cement milk supply source 6, respectively. At the same time, water, air, and cement milk are supplied to a water channel 12, an air channel 11, and a cement milk channel 10 provided in the injection rod 1. Thus, the cement milk, air, and water supplied from the water supply source 4, the air supply source 5, and the cement milk (hardening material liquid) supply source 6 are respectively supplied to the supply pipes 7, 8, 9. → Swivel 3 → Jet from each nozzle through each flow path. In this embodiment, for convenience of explanation, each of the tip nozzles 101 to 104, the air injection port 105, the injection nozzle 13, and the air injection ports 107 and 108 has one supply source of water, air, and cement milk. Although it has been described that water, air, and cement milk are supplied from the supply sources 4, 5, and 6, actually, the supply source, the supply pipe, and the flow path are provided corresponding to each nozzle and injection port. Yes.

Next, the injection rod will be described with reference to FIGS. FIG. 2 is a side view of an injection rod used in the underground consolidated body construction method in one embodiment of the present invention, and FIG. 3 is a perspective view of the injection rod. 4 is a view showing an air injection port provided in the injection rod, and FIG. 5 is a cross-sectional view of the air injection port provided in the injection rod.

As shown in FIG. 2, the injection rod 1 is provided with an injection nozzle 13 for injecting cement milk and air on the side surface, and an air injection port 108 for injecting air, and water (liquid) at the tip. Tip nozzles 101 to 104 for jetting air and an air jet port 105 for jetting air are provided. Note that, as described above, in the present embodiment, description will be made by using water (liquid) ejected from the tip nozzles 101 to 104. However, the present invention is not limited to this, and from some or all of the tip nozzles 101 to 104. It may be such that cement milk is jetted. In the present embodiment, four tip nozzles are provided at the tip of the injection rod 1. However, the number is not limited to four, and may be one to three, or five or more.

As shown in FIG. 2, the injection nozzle 13 includes a material liquid injection nozzle 14 for injecting cement milk and an air injection nozzle 17 for injecting compressed air. Specifically, the material liquid injection nozzle 14 is provided on the inner tube of the injection nozzle 13, and the air injection nozzle 17 is provided on the outer tube. In this way, when cement milk and compressed air are jetted from the jet nozzle 13 at a high pressure, cement milk is jetted from the inside of the jet nozzle 13, compressed air is jetted from the outside (outer peripheral portion), and the cement milk jet By forming a compressed air layer coating around, it is possible to increase the injection reach compared to the case where there is no compressed air layer coating.

Further, as shown in FIG. 3, inlets of the cement milk flow path 10, the air flow path 11, and the water flow path 12 described above are provided on the upper surface of the injection rod 1. Cement milk, air, and water are introduced from these inlets, and are injected from a nozzle or the like through the cement milk flow path 10, the air flow path 11, and the water flow path 12.

As described above, in the present embodiment, for convenience of explanation, the water, air, and cement milk flow paths of the tip nozzles 101 to 104, the air injection port 105, the injection nozzle 13, and the air injection ports 107 and 108 are respectively shown. Although it has been described that water, air, and cement milk are supplied from the flow paths 10, 11, and 12, the flow paths actually correspond to the respective nozzles and injection ports.

The injection rod 1 of this embodiment has a circular cross section with a diameter of about 10 cm to 20 cm (for example, 14.2 cm), and a passage (for example, cement milk, compressed air, water, a wiring tube for a measurement sensor, a hydraulic pipe, etc.) A porous tube having a flow path) is used. Then, these injection rods 1 are sequentially connected while adjusting the positions of the respective passages and inserted into the ground. In the present embodiment, the injection rod 1 having a circular cross section with a diameter of about 10 cm to 20 cm is used. However, the present invention is not limited thereto, and an injection rod 1 having a square cross section with a side of about 10 cm to 18 cm may be used.

  As shown in FIG. 4, the air injection ports 107 and 108 are provided in the concave portion 109 provided on the side surface of the injection rod 1, and a part of the concave portion 109 (the portion where the air injection ports 107 and 108 are provided) As will be described later, it is covered with a rubber presser 110 via a cover rubber 111. The rubber presser 110 is fixed to the injection rod 1 with a bolt or the like.

As shown in FIG. 5, the air injection ports 107 and 108 are connected to the air flow path 11. The air supplied from the air channel 11 is jetted upward from the air jets 107 and 108 through, for example, a channel having an inclination of about 20 degrees with respect to the cross section of the injection rod 1 (see FIG. 5). . A cover rubber 111 is attached to the inlets of the air injection ports 107 and 108. The cover rubber 111 is pressed in the direction of the injection rod 1 by the rubber press 110 described above, and acts to close the air injection ports 107 and 108 when air is not being injected from the air injection ports 107 and 108. When air is ejected from the air ejection ports 107 and 108, the upper side is opened by the pressure of the air, and the air is ejected along the recess 109 of the injection rod 1. The lower part of the cover rubber 111 is fixed to the injection rod 1 together with the rubber presser 110. In addition, as described above, in this embodiment, for convenience of explanation, the air injection ports 107 and 108 have one air flow path (air flow path 11), and air is supplied from the flow path 11. As described above, in reality, there are flow paths corresponding to the respective air injection ports 107 and 108.

  Next, the construction procedure by the underground consolidated body construction method in one Embodiment of this invention is demonstrated using FIG. FIG. 6 is a flowchart showing a construction procedure of the underground consolidated body construction method in one embodiment of the present invention.

  First, in S1, the injection rod 1 is positioned at a position to be excavated. Specifically, the injection rod 1 is suspended by a crane, and the injection rod 1 is positioned at a position to be excavated. Then, when the injection rod 1 is positioned at a predetermined position to be excavated, the process proceeds to S2.

In S <b> 2, water (liquid) is ejected from the tip nozzles 101 to 104 of the injection rod 1 at a high pressure and air is ejected from the air ejection port 105.

In S3, air is injected from the air injection port 107 (108) on the side surface of the injection rod 1. In this way, air is ejected from the air ejection port 107 (108) on the side surface of the injection rod 1 so that the liquefied earth and sand present on the side surface of the injection rod 1 is pulled up to the ground. When the end of the injection rod 1 comes to the vicinity of the grip 18 (see FIG. 1) of the work implement 2 while water and air are being jetted, the end of the injection rod 1 is gripped by the grip 18 of the work implement 2. The end portion (the other end portion) of the same kind of injection rod 1 is connected to the end portion of the injection rod 1 held by the holding portion 18 of the work machine 2 with a bolt, and the injection rod 1 connected with the bolt is also used. Similarly, it is suspended by a crane and inserted into the ground. By repeating this, the injection rod 1 having a length corresponding to the depth of the hole 15 is inserted into the ground. The injection rod 1 provided with the air injection port 107 (108) is similarly coupled to the rear end portion of the injection rod 1 (see FIG. 2).

The water injection from the tip nozzles 101 to 104 and the air injection from the air injection port 105 executed by S2 are performed by the operator by a liquid injection pressure setting switch (not shown) and an air injection pressure setting switch (not shown). Starts when is operated. Specifically, it starts when the operator operates the injection pressure of the liquid injection pressure setting switch (not shown) and the air injection pressure setting switch (not shown) to change from “0” to a desired injection pressure. To do. Similarly, the air injection from the air injection ports 107 and 108 executed in S3 is started by an operator operating an air injection pressure setting switch (not shown). Specifically, the operation is started when an operator operates the injection pressure of an air injection pressure setting switch (not shown) from “0” to a desired injection pressure. And it is judged by S4 whether injection rod 1 was inserted to the predetermined depth, and if it is judged that it was inserted to the predetermined depth, it will progress to S5.

In this way, in the insertion step of the injection rod 1, compressed air is injected in the ground direction from the air injection ports 107 and 108 provided on the side surface of the injection rod 1, so that the ground on the side surface of the injection rod 1 collapses. Even if it is difficult to discharge the mud to the ground, the earth and sand present on the side surface of the injection rod 1 is pulled up to the ground along the side surface of the injection rod 1 by the force of the air injected toward the ground. Therefore, the mud present on the side surface of the injection rod 1 can be smoothly lifted to the ground by the air lift effect of the compressed air.

In S5, the water injection from the tip nozzles 101 to 104 and the air injection from the air injection port 105 are terminated, and the process proceeds to S6. Note that the water injection from the tip nozzles 101 to 104 and the air injection from the air injection port 105 executed in S2 are performed by the operator by a liquid injection pressure setting switch (not shown) and an air injection pressure setting switch (not shown). Ends by operating (omitted). Specifically, the operation is terminated when the operator operates the injection pressures of the liquid injection pressure setting switch (not shown) and the air injection pressure setting switch (not shown) to be “0”.

By S6, cement milk and compressed air are injected from the injection nozzle 13 while the injection rod 1 is swung. Specifically, when the injection rod 1 is rotated 30 degrees (predetermined angle) while cement milk (pressure of about 40 MPa) is jetted from the injection nozzle 13 together with compressed air (pressure of about 1 MPa), A fan-shaped consolidated body is formed. The cement milk injection and air injection from the injection nozzle 13 executed in S6 are performed by the operator by operating a cement milk injection pressure setting switch (not shown) and an air injection pressure setting switch (not shown). Start by. Specifically, the operator operates the cement milk injection pressure setting switch (not shown) and the air injection pressure setting switch (not shown) to change the injection pressure from “0” to a desired injection pressure. Start. In this embodiment, the injection rod 1 is swung. However, the present invention is not limited to this, and the injection rod 1 may be rotated in one direction (right rotation or left rotation is possible).

Thus, cement milk and compressed air are jetted from the jet nozzle 13 at a high pressure, so that the jet action region in the ground can be increased by vortex and cavitation generated by the jet jetted from the jet nozzle 13. Further, in the case where a fan-shaped solid body is formed by high-pressure jetting of cement milk from the injection nozzle 13 while the injection rod 1 is swung, the thickness of the solidified body in the vicinity of the injection nozzle 13 is usually reduced. According to the present invention, since the ground around the injection rod 1 is also liquefied, the cement milk jetted from the injection nozzle 13 is mixed with the liquefied ground, and the width of the solidified body around the injection rod 1 is mixed. Can be made thicker. Since the waste mud mixed with the ground (soil, stone, etc.) and cement milk crushed by the jet flow jetted from the jet nozzle 13 is always discharged from between the injection rod 1 and the hole 15, the waste mud is It is sucked and processed directly by a vacuum car.

In the present embodiment, the pressure of the cement milk sprayed from the spray nozzle 13 is 40 MPa, but is not limited thereto, and is 20-50 MPa.
You may make it eject with the pressure of. Further, the injection rod 1 is swung by 30 degrees to form a fan-shaped solid body in the ground. However, the present invention is not limited to this, and a wall-like rotary body may be formed without rotating the injection rod 1. The fan-shaped solid body may be formed by rotating the angle. Alternatively, the injection rod 1 may be rotated 360 degrees to form a circular solid body in the ground.

  In S7, the injection rod 1 is pulled up by a predetermined length (for example, 10 cm or less (preferably 5 cm)) in a state where the injection rod 1 is swung by 30 degrees in S6. Specifically, the injection rod 1 can be pulled up by a predetermined length by moving the gripping portion 18 (upper gripping portion 18) of the working machine 2 that grips the injection rod 1 upward. When the injection rod 1 is pulled up by a predetermined length, the process proceeds to S8. Here, one process of S6 and S7 is combined to constitute “one step”.

In S8, it is determined whether the injection has been completed. Specifically, a predetermined step is executed, and it is determined whether cement milk and compressed air are no longer sprayed from the spray nozzle 13. If “NO” is determined in S8, the process proceeds to S6. In S6, cement milk and compressed air are injected from the injection nozzle 13 while the injection rod 1 is swung counterclockwise from the state in which the injection rod 1 is pulled up (the previous state of S7). Then, when the injection rod 1 swings 30 degrees counterclockwise, the process proceeds to S7. In this way, until the injection from the injection nozzle 13 is completed, S6 (clockwise swing injection) → S7 (injection rod pull-up) → S6 (counterclockwise swing injection) → S7 (injection rod pull-up) → S6 (clockwise swinging injection) → S7 (pouring rod pulling up) is repeated. If a predetermined step is executed in S8 and it is determined that the injection is completed, the process proceeds to S9. The cement milk injection and air injection from the injection nozzle 13 executed in S6 are performed by the operator by operating a cement milk injection pressure setting switch (not shown) and an air injection pressure setting switch (not shown). To finish. Specifically, the operation is terminated when the operator operates the injection pressure of the cement milk injection pressure setting switch (not shown) and the air injection pressure setting switch (not shown) to be “0”. In the present embodiment, for convenience of explanation, the air injection pressure of the air injection port 105, the injection nozzle 13, and the air injection ports 107 and 108 has been described as being adjusted by a single air injection pressure switch. An air injection pressure switch is provided for each nozzle and injection port. The same applies to the water injection pressure.

In S9, the injection of air from the air injection port 107 (108) is terminated, and the process proceeds to S10. As described above, even when the processes of S6 and S7 are being performed, the compressed air is injected in the ground direction from the air injection port 107 (108) provided on the side surface of the injection rod 1, so that the injection rod 1 Even if it is difficult to discharge the mud to the ground due to the collapse of the ground on the side of the soil, the earth and sand present on the side of the injection rod 1 is caused by the force of the air injected toward the ground. The mud that is pulled up to the ground along the side surface and exists on the side surface of the injection rod 1 can be smoothly discharged to the ground by the air lift effect of the compressed air. Furthermore, since a plurality of air injection ports 107 and 108 are provided on the side surface of the injection rod 1, the compressed air injected from the air injection ports 107 and 108 causes an upper portion from the location where the air injection ports 107 and 108 are provided. The earth and sand are pulled up to the ground, and the mud present on the side surface of the injection rod 1 can be smoothly discharged to the ground by the air lift effect of the compressed air.

In S10, the injection rod 1 is pulled up from the drilling hole 15 by a crane (not shown). Specifically, the injection rod 1 inserted into the hole 15 is pulled up by a crane and extracted from the hole 15. By doing so, a consolidated body as shown in FIG. 7 is formed.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

Hereinafter, modifications of the present invention will be described.
(1) In this embodiment, cement milk and compressed air are injected from the injection nozzle 13 at a high pressure. However, the present invention is not limited thereto, and compressed air is not injected from the injection nozzle 13 and only cement milk is injected at a high pressure. May be.

(2) In the present embodiment, the injection rod 1 is provided with two air injection ports. However, the present invention is not limited thereto, and three air injection ports may be provided, or four or more may be provided.

(3) In the present embodiment, the compressed air is injected at a constant injection pressure from the air injection ports 107 and 108. However, the present invention is not limited to this, and the injection pressure of the compressed air injected from the air injection ports 107 and 108 May be changed. Thereby, the injection force of compressed air can be changed with the hardness and soil quality of a natural ground, and it can prevent beforehand that the waste mud which exists in the side surface of the injection | pouring rod 1 is blocked. Further, the exhaust pressure present on the side surface of the injection rod 1 is increased by increasing the injection pressure of the compressed air injected from the air injection ports 107 and 108 before the waste mud existing on the side surface of the injection rod 1 is likely to be clogged. It is possible to prevent mud from being clogged. Moreover, you may enable it to change the injection quantity of the compressed air injected from the air injection ports 107 and 108. FIG. This also has the same effect as described above.

(4) In this embodiment, when the injection rod 1 is swung, the injection rod 1 is first swung clockwise and then counterclockwise. The rod 1 may be swung counterclockwise and then rotated clockwise.

(5) In the present embodiment, each process of S6 and S7 is combined to be “one step”. However, the present invention is not limited to this, and a combination of processes executed each time S6 and S7 is combined. It may be “one step”, and when the injection rod 1 is rotated, one rotation may be “1 step”, and a plurality of rotations may be “1 step”.

(6) In this embodiment, although the aspect which does not provide the pressure sensor for measuring a ground pressure was demonstrated, not only this but the pressure sensor 100 as shown in FIG. 1 may be provided so that the ground pressure around the injection rod 1 can be detected. As a result, even if the ground pressure rises due to the reason that the mud cannot be discharged to the ground, the pressure sensor 100 detects this and prevents the mud present on the side surface of the injection rod 1 from being clogged. In addition, it is possible to prevent the surrounding ground from being raised. The detection signal detected by the pressure sensor 100 is displayed on a monitor (not shown) of the ground management device via a pressure detection cable inserted into the perforated pipe (see FIG. 3). Further, the pressure detected by the pressure sensor 100 may be used to change the injection pressure of air injected from the air injection ports 107 and 108 by a control means (not shown), or the air injection port You may enable it to change the injection quantity of the compressed air injected from 107,108.

It is a figure which shows the construction condition of the underground solid body construction method in one Embodiment of this invention. It is a side view of the injection rod used for the underground solid body construction method. It is a perspective view of the injection rod. It is a figure which shows the air injection opening provided in the injection rod. It is sectional drawing of the air injection opening provided in the injection rod. It is a flowchart which shows the construction procedure of the underground solid body construction method in one Embodiment of this invention. It is a figure which shows the construction condition of the underground solid body construction method in one Embodiment of this invention. It is a side view of the injection rod used for the underground solid body construction method in the modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection rod 2 Working machine 3 Swivel 13 Injection nozzle 15 Cutting hole 14 Material liquid injection nozzle 17 Air injection nozzle 100 Pressure sensor 101-104 Tip nozzle 107, 108 Air injection port

Claims (6)

It is an underground solid body construction method of creating a solid body by high-pressure jetting of a curing material liquid from a spray nozzle provided on a side surface of an injection rod,
An insertion step of inserting the injection rod provided with the injection nozzle to a predetermined depth of the target ground;
An injection step of high-pressure injection of the curing material liquid from the injection nozzle;
An air injection step of injecting compressed air from an air injection port provided on a side surface of the injection rod;
Anda pull on the gel pulling step the injection rod from the target ground,
In the air injection step, to inject compressed air in the ground direction, both raising the sand on the ground direction by the jet force, pulling the sediment on the ground by the air lift effect, characterized Rukoto liquefied sand is raised on the ground Underground consolidated body construction method. The air injection port is ground consolidated body Construction method of claim 1 Symbol mounting, characterized in that provided more on the side wall of the injection rod. 3. The underground consolidated body construction method according to claim 1, wherein in the air injection step, compressed air is injected from the air injection port while rotating or swinging the injection rod. The underground solid body construction method according to any one of claims 1 to 3 , wherein at least one of an injection pressure and an injection amount of compressed air injected from the air injection port can be changed. The underground solid body formation apparatus which produces | generates a solidified body using the underground solid body formation construction method of any one of Claims 1-4 . The underground solid body forming apparatus according to claim 5, further comprising a pressure sensor that is provided on a side surface of the injection rod in the vicinity of the upper portion of the injection nozzle and detects a pressure in the ground.

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