Construction diameter measuring device, injection device, and high-pressure injection mixing method used in high-pressure jet agitation construction.

Abstract

This invention provides a ground diameter measuring device that enables real-time measurement of the ground diameter when creating a ground improvement body horizontally using high-pressure jet agitation. [Solution] The construction diameter measuring device is installed on the injection device (tip monitor) for the high-pressure jet mixing method. The construction diameter measuring device has a measuring device body 23 consisting of a weight that is ejected radially in the improved body, a high-pressure pump that generates high-pressure water to eject the measuring device body 23, a wire 25 connected to the measuring device body 23, a distance meter 27 that measures the distance traveled by the ejected measuring device body 23 based on the amount of wire 25 extended, a vibrator 41 that generates vibration in the measuring device body 23, and a switch 43 that activates the vibrator 41 only when the measuring device body 23 is ejected. By using this device, the construction diameter can be measured in real time during horizontal construction of the high-pressure jet mixing method, so quality control can be performed immediately at the construction site.

Description

Technical Field

[0005] ,

[0006] ,

[0001] The present invention relates to a formation diameter measuring device having a function of measuring the diameter (formation diameter) of a ground improvement body formed by a high-pressure jet mixing method, an injection device (tip monitor) for the high-pressure jet mixing method including this formation diameter measuring device, and a high-pressure jet mixing method using the same.

Background Art

[0002] In the high-pressure jet mixing method, an injection device is attached to the tip of a rod, and while rotating or oscillating the rod, a liquid curing material or the like is injected into the ground at high pressure to form a columnar ground improvement body. The conventional high-pressure jet mixing method has mainly been applied in the vertical direction, but the applicant of the present application has newly proposed a technology applicable also in the horizontal direction, and it has been confirmed that it can be widely applied in sites where construction from the ground is difficult.

[0003] An example of the horizontal high-pressure jet mixing method is shown in FIGS. 4 and 5. FIG. 4 shows an example of construction equipment used in the horizontal construction of the high-pressure jet mixing method. FIG. 5 is a process diagram showing the horizontal construction of the high-pressure jet mixing method. While referring to FIGS. 4 and 5, the outline of each process of (a) to (d) in FIG. 5 will be described.

[0004] (a) Attach the mouthpiece pipe 51 to the wellhead and perform curing. Also, install the construction machine 53 for both drilling and formation in the vertical shaft, attach the injection device 1 to the tip of the rod 55 (multi-hole pipe) having a plurality of flow paths, and perform drilling in the horizontal direction while adding rods.

[0005] (b) Drill horizontally until the injection device 1 at the tip of the rod reaches the planned distance.

[0006] (c) Once the rod tip of the injection device 1 has reached the planned distance after drilling horizontally, the construction process is started. In the construction process, columnar ground improvement bodies are constructed horizontally. In this construction process, while the rod 55 is pulled out horizontally and the rod is oscillated or rotated at a predetermined angle, a cement-based hardening liquid such as cement milk and air are jet-injected from the injection port 5 of the injection device 1. The sludge generated by cutting the ground with a jet stream consisting of a combination of high-pressure hardening liquid and high-pressure air is forcibly sucked into the sludge outlet 7 of the injection device 1, as shown in Figure 4, and transported to the ground surface via the rod 55 and the sludge discharge pipe 59. At the same time as cutting the ground, the hardening material and soil are mixed together to create a strong ground improvement body.

[0007] After creating one stroke's worth of material, the rod 55 is cut and retrieved.

[0008] (d) The process described in (c) above is repeated sequentially to carry out the planned construction work and create a horizontal ground improvement body.

[0009] In the aforementioned horizontal high-pressure jet agitation method, there has been a strong demand for real-time confirmation, from the perspective of construction quality control, of whether the ground improvement body being constructed is formed to the diameter specified in the design.

[0010] However, unlike conventional vertical construction methods, it is difficult to directly observe the internal state of the ground during horizontal construction, and the measurement methods used in conventional vertical construction methods made it difficult to determine the diameter of the improved ground. Therefore, it was essential to introduce a new measurement method that could measure the diameter of the improved ground in real time in horizontal high-pressure jet mixing methods. [Overview of the project] [Problems that the invention aims to solve]

[0011] Therefore, in view of the problems of the conventional technology described above, the object of the present invention is to provide a ground-improvement diameter measuring device that enables real-time measurement of the diameter (construction diameter) of a ground-improvement body constructed by a horizontal high-pressure jet agitation method, a jetting device (tip monitor) for a high-pressure jet agitation method equipped with this ground-improvement diameter measuring device, and a high-pressure jet agitation method using the same. [Means for solving the problem]

[0012] The above objective is to provide a ground improvement diameter measuring device, which is installed in a jetting device used in a high-pressure jetting mixing method for creating a ground improvement body horizontally, and which measures the diameter of the ground improvement body created by the jetting device, A measuring device body is provided in the injection device and is emitted in the radial direction of the ground improvement body, A pressurizing means for launching the measuring device body from the injection device, A wire is provided, with one end connected to the measuring device body and designed to be extended by firing from the measuring device body. A measuring means for measuring the distance traveled by the measuring device body launched from the injection device based on the wire payout amount, This is achieved by a construction diameter measuring device used in a high-pressure injection mixing method, which is characterized by having the following features:

[0013] The measuring device body of the above-mentioned diameter measuring device is equipped with a vibrator for generating vibrations.

[0014] Furthermore, the measuring device body of the above-mentioned diameter measuring device is equipped with a switch for operating the vibrator. This switch automatically activates the vibrator at the timing when the measuring device body is ejected from the injection device.

[0015] Furthermore, the pressurizing means of the diameter-forming measuring device described above includes a pump for applying high-pressure water to the measuring device body when firing. This pump generates high-pressure water for firing the measuring device body.

[0016] Furthermore, the aforementioned objective is The above-mentioned diameter measuring device, A storage section for storing the measuring device body in a manner that allows it to be fired, A spray nozzle for spraying liquid hardening agent, This is achieved by an injection device used in a high-pressure injection mixing method, which is characterized by having the following features:

[0017] The opening leading to the storage section of the injection device is formed in a tapered shape that widens outwards.

[0018] Furthermore, the aforementioned objective is The process involves attaching the injection device equipped with the above-mentioned drilling diameter measuring device to the tip of a rod and drilling horizontally to the target distance, The process involves withdrawing the rod while rotating or oscillating the rod, and spraying the liquid hardening agent from the spraying part of the spraying device. A step of launching the measuring device body of the diameter-forming measuring device from the injection device and measuring the distance traveled by the measuring device body based on the length of the wire extended from the measuring device body, This is achieved by a high-pressure injection mixing method characterized by including [the following].

[0019] The construction diameter is determined based on the measured wire extension length. The measured wire extension length may be considered as the construction diameter, or a predetermined correction process may be applied to the measured wire extension length, and the value after the correction process may be treated as the construction diameter. In other words, the construction diameter (the radius of the ground improvement body being constructed) may be calculated based on the measured wire extension length. Furthermore, the construction diameter obtained through the above measurement process may be displayed in real time on a display device during construction. [Effects of the Invention]

[0020] With the formation diameter measuring device used in the high-pressure jet mixing method according to the present invention, it is possible to perform real-time measurement on the ground improvement body formed horizontally, so that quality control can be immediately carried out at the construction site. In addition, by providing a pressurizing means for launching the measuring device main body and a measuring means based on the amount of wire pay-out, it is possible to surely grasp the formation diameter even in horizontal construction where it is difficult to directly observe the state inside the ground. As a result, the accuracy of horizontal construction, which was difficult with the conventional technology, is improved, and the construction efficiency and quality are improved.

[0021] In addition, since the measuring device main body is provided with a vibrator, it becomes possible to efficiently penetrate into the uncured ground improvement body immediately after the measuring device main body is injected. That is, the resistance to the uncured ground improvement body is reduced by vibration, and the measuring device main body can move smoothly, so that the measurement accuracy and work efficiency are improved. In addition, since the stable movement of the measuring device main body is ensured by the action of the vibrator, the measurement result of the diameter is stable, and the effect of increasing the reliability in the quality control of construction is obtained.

[0022] In addition, with the measuring device main body provided with a switch that automatically operates, the vibrator automatically operates at the moment the measuring device is launched, and the effect of smoothly advancing into the uncured ground improvement body is obtained. As a result, it is not necessary for the operator to manually operate the vibrator, which not only improves the work efficiency but also prevents the measuring device from malfunctioning or making errors due to a timing delay. In addition, since vibration is started immediately after the measuring device main body is launched, measurement is performed under optimal conditions, and a more accurate and stable measurement result of the diameter is obtained. As a result, the reliability in the quality control of construction is further improved.

[0023] Also, by applying high-pressure water to the main body of the measuring device using a pump as the pressurizing means, it becomes possible to eject the main body of the measuring device powerfully and reliably. In particular, in an uncured ground improvement body, since there is resistance, it is required to provide sufficient pressure. However, by using the high-pressure water generated by the pump, this resistance can be overcome and the main body of the measuring device can smoothly penetrate. Also, when an appropriate pressure is applied, the main body of the measuring device moves at a stable speed, and the effect of improving the measurement accuracy of the formed diameter can be obtained. As a result, the efficiency of the work at the construction site and the reliability of the measurement are improved, and the accuracy of quality control is also enhanced.

[0024] Also, since the injection device of the present invention can store the main body of the measuring device in the storage part, when measurement is not required, the main body of the measuring device can be stored so as not to be in the way, and the work can proceed without interfering with the drilling or ground improvement work. Also, when measurement is required, the device can be fired quickly and the formed diameter can be measured in real time, so the construction accuracy is improved. As a result, accurate quality control is possible at the construction site, and efficient and reliable ground improvement is realized.

[0025] Also, since the storage part entrance, which is an opening, is formed in a tapered shape that expands toward the outside, the operation when recovering the ejected main body of the measuring device becomes easy, and the effect that the main body of the measuring device can be smoothly stored in the storage part without being caught is obtained.

[0026] Also, according to the high-pressure jet mixing method of the present invention, it becomes possible to proceed with the construction while checking the diameter of the ground improvement body to be formed. As a result, quality control is thoroughly implemented and reliable construction is realized.

Brief Description of the Drawings

[0027] [Figure 1] It is a side view (perspective view) showing the schematic configuration of an injection device including a formed diameter measuring device according to the present invention. [Figure 2]Figure 1 is a partial cross-sectional view showing the schematic configuration of the diameter-forming measuring device equipped in the injection device, where Figure 2(a) shows the measuring device body in the storage compartment, and Figure 2(b) shows the measuring device body immediately after being ejected from the storage compartment. [Figure 3] Figure 2 is a cross-sectional view showing the measurement of the diameter (construction diameter) of the ground improvement body being constructed using the construction diameter measuring device. [Figure 4] This is a side view showing the schematic configuration of construction equipment used in the high-pressure jet mixing method for creating a ground improvement body horizontally. [Figure 5] This is a process diagram showing the construction of a high-pressure jet agitation method for creating a ground improvement body horizontally. [Modes for carrying out the invention]

[0028] (Configuration of the injection system) First, the configuration of the injection device (tip monitor) will be explained based on Figures 1 and 2. In this embodiment, injection device 1 is a device used by first attaching it to the tip of the rod in a high-pressure injection mixing method for creating a ground improvement body in the horizontal direction. Hereinafter, the ground improvement body will be abbreviated as "improved body".

[0029] As shown in Figure 1, the injection device 1 is • The drilling bit 3 is provided at the tip, • A spray unit 5 that sprays liquid propellant at high pressure, • A flow path for individually pressurizing liquid propellant such as cement grout or water toward the injection unit 5, • A mud discharge port 7 for forcibly sucking up the mud generated by cutting the ground with a jet (jet) consisting of liquid propellant sprayed from the injection unit 5, • Horizontal and oscillation angle sensors 9 for real-time monitoring of the position and orientation of the injection device 1, • A subsurface pressure sensor 11 is used to measure the pressure conditions inside the ground in real time. I have it.

[0030] Each of the above parts is provided on the columnar injection device body 13.

[0031] The injection unit 5 is composed of, for example, a hardening agent nozzle and an air nozzle. During the improved ground construction process, the hardening agent nozzle of the injection unit 5 sprays a cement-based hardening agent liquid, such as cement milk, at ultra-high pressure. Simultaneously, the air nozzle of the injection unit 5 sprays air at ultra-high pressure. The ultra-high-pressure jet stream consisting of the hardening agent liquid and air sprayed from these nozzles of the injection unit 5 cuts the ground and mixes the hardening agent with the soil during the improved ground construction process. Alternatively, a high-pressure water nozzle that sprays high-pressure water may be provided instead of an air nozzle. In this case, the ultra-high-pressure, powerful jet stream consisting of hardening agent liquid and high-pressure water sprayed from the nozzle of the spraying unit 5 will cut the ground during the construction of the improved body and also play a role in mixing the hardening agent (such as cement grout) with the soil.

[0032] Furthermore, the injection device 1 of this embodiment has the above configuration, in addition to the above configuration, • A construction diameter measuring device 21 for measuring the diameter of the improved body to be constructed, A storage section 15 is provided to store the measuring device body 23, which is part of the construction diameter measuring device 21, in a manner that allows it to be injected. I have it.

[0033] The construction diameter measuring device 21 is used in high-pressure injection mixing methods for creating improved soil bodies horizontally, and is a device for measuring the diameter of the improved soil body being created in real time. The specific configuration of the construction diameter measuring device 21 will be described later based on Figure 2.

[0034] The storage section 15 is a space that allows the measuring device body 23 to be ejected. As shown in Figure 2, when the measuring device body 23 is ejected from the storage section 15, it is launched straight out through the opening 17 in the radial direction of the improved body to be created. When retrieving the ejected measuring device body 23, the measuring device body 23 is pulled back into the storage section 15 through the tapered opening 17 by manually pulling the wire 25 connected to the measuring device body 23. The opening 17 leading to the storage section 15 is formed in a smooth tapered shape that widens outward, so the measuring device body 23 is stored smoothly without getting caught during retrieval.

[0035] (Configuration of the construction diameter measuring device) Next, the specific configuration of the diameter-forming measuring device 21 provided by the injection device 1 will be described based on Figures 2 and 3.

[0036] The construction diameter measuring device 21 is, • A measuring device body 23 is provided so as to be able to be fired from the injection device body 13, A wire 25 with one end connected to the measuring device body 23, • A high-pressure pump, which is a pressurizing means for firing the measuring device body 23, - A distance meter 27 is used to measure the distance traveled by the launched measuring device body 23. I have it.

[0037] The pressurizing means, a high-pressure pump, generates high-pressure water for launching the measuring device body 23 from the injection device body 13. The high-pressure water for launching (for example, 1 MPa high-pressure water) is applied to the back of the measuring device body 23 (the head of the measuring device body 23 in the drawing) at the time of launching the measuring device body 23. Specifically, the high-pressure water generated by the high-pressure pump is supplied only when launching the measuring device body 23, and is guided to the storage unit 15 via the high-pressure water channel 31 and guide hole 32, and applied to the back of the measuring device body 23. The measuring device body 23 in the storage unit 15 receives the high-pressure water applied from the back and is launched from the storage unit 15.

[0038] The outlet of the high-pressure water channel 31 branches into two guide holes (guide passages) 32 and 33. A packing 35 is provided in one of the guide holes 33 to ensure that the high-pressure water supplied through the high-pressure water channel 31 is reliably guided to the back of the measuring device body 23 when the measuring device body 23 is launched. By sealing the guide hole 33 with this packing 35, the high-pressure water is reliably guided to the storage section 15 via the high-pressure water channel 31 and the guide hole 32 and applied to the back of the measuring device body 23. Therefore, in this embodiment, the combination of the high-pressure pump, the high-pressure water channel 31, and the guide hole 32 can be considered to function as a pressurizing means for launching the measuring device body 23.

[0039] The wire 25 is made of, for example, stainless steel wire. The wire 25 is arranged along guide holes (guide passages) 33, 32 and is provided to be able to be fed out and pulled along the guide holes. One end of the wire 25 is connected to the back of the measuring device body 23. The other end of the wire extends to the operator's hand through the injection device 1 and the perforated tube connected to it. The operator can manually loosen or pull the wire 25. When the measuring device body 23 is launched, the operator loosens the wire at their hand so that the wire is fed out following the forward movement of the measuring device body 23. On the other hand, when the measurement of the construction diameter is completed and the measuring device body 23 is to be retrieved, the wire is manually pulled and stored in the storage section 15 of the injection device 1.

[0040] The wire 25 may be connected to a wire-feeding / winding device (not shown) to automate the wire-feeding and winding. This wire-feeding / winding device allows the wire to be fed out when the measuring device body 23 is launched, and allows the wire to be wound up when the measuring device body 23 is retrieved.

[0041] The distance meter 27, which is a measuring means, is a measuring device for measuring the distance traveled by the measuring device body 23 launched from the injection device body 13, based on the amount of wire 25 extended. When the measuring device body 23 is launched, it moves straight through the uncured improved material, accompanied by the extension of the wire 25 connected to it. The distance meter 27 can be composed of, for example, a rotary encoder or an optical sensor. A rotary encoder calculates the distance traveled by measuring the angle of a part that rotates as the wire is extended, while an optical sensor can measure the amount of wire traveled non-contact.

[0042] The measuring device body 23 is a structure that functions as a pointed weight. The measuring device body 23 is launched at a predetermined timing (for example, after the injection of the hardening agent liquid for creating the improved body is completed). When the measuring device body 23 is launched from the injection device body 13, it propels itself through the unhardened improved body in the radial direction of the improved body. The launched measuring device body 23 propels itself straight downwards, powered by the pressure of the high-pressure water applied at the time of launch and its own weight. In this application, "radial direction" refers to the direction of a straight line extending from the center point of the semicircular cross-section to any point on the outer circumference when the cross-section of the improved body to be created is, for example, semicircular. It also refers to the direction of a straight line extending from the center point of the circular cross-section to any point on the outer circumference when the cross-section of the improved body to be created is, for example, circular.

[0043] As shown in the lower part of Figure 3, the launched measuring device body 23 advances through the unhardened improved ground to the boundary between the unhardened improved ground and the unimproved ground, where its pointed tip hits the wall of the unimproved ground (and it can no longer advance), thus stopping its progress. Therefore, by measuring the length of wire 25 extended from the time the measuring device body 23 is launched until it stops, the distance traveled by the launched measuring device body 23 can be determined. This distance traveled is approximately equal to the diameter of the improved ground being constructed. Therefore, if the length of wire 25 extended after the measuring device body 23 is launched is known, the diameter of the improved ground can be determined based on that extension length.

[0044] The measuring device body 23, which is ejected from the injection device body 13, A vibrator 41 generates vibrations in the measuring device body 23 that penetrates the uncured improved body, A switch 43 for activating the vibrator 41 at a predetermined timing, • The battery 45, which consists of a button cell, serves as the power source for the vibrator 41. I have it.

[0045] The switch 43 is configured to automatically activate the vibrator when the measuring device body 23 is ejected from the injection device body 13. In this embodiment, the switch 43 has a rounded, curved tip (head), and as shown in Figure 2(b), the curved tip protrudes from the outer surface of the measuring device body 23, or as shown in Figure 2(a), it is embedded inside the measuring device body 23.

[0046] A spring is provided at the base of the switch 43, and in the housing state shown in Figure 2(a), the switch 43 is pushed in and embedded by the inner circumferential surface of the storage section 15. In this state, the switch 43 remains in the OFF state so that the vibrator 41 is not activated. On the other hand, as shown in Figure 2(b), when the measuring device body 23 is ejected from the storage section 15, the switch 43 protrudes from the outer circumferential surface of the measuring device body 23 due to the biasing force of the spring, switches to the ON state, and activates the vibrator 41.

[0047] (High-pressure jet agitation method using a construction diameter measuring device) Next, based on Figures 4 and 5, we will explain the case in which a high-pressure injection agitation method is implemented in the horizontal direction using the injection device 1 with the above configuration.

[0048] The outlines of each process (a) to (d) in Figure 5 are as follows:

[0049] (a) A mouth pipe 51 is attached to the shaft entrance and curing is carried out. A construction machine 53 for both drilling and construction is set up in the shaft, and the injection device 1 of this embodiment is attached to the tip of a rod 55 (perforated pipe) equipped with multiple flow channels, and drilling is carried out in the horizontal direction while extending the rod.

[0050] (b) The injection device 1 at the tip of the rod drills horizontally until it reaches the planned distance.

[0051] (c) Once the injection device 1 at the tip of the rod has reached the planned distance after drilling horizontally, the construction process is started. In this embodiment, a columnar improved body is constructed horizontally. In this construction process, while pulling out the rod 55 horizontally and swinging or rotating the rod at a predetermined angle, a high-pressure hardening material such as cement milk is injected from the hardening material nozzle of the injection unit 5, and high-pressure air is injected from the air nozzle. The mud generated by cutting the ground with a jet stream consisting of high-pressure hardening liquid and high-pressure air is forcibly sucked into the mud discharge port 7 provided in the injection device 1, as shown in Figure 4, and transported to the ground surface via the rod 55 and the mud discharge pipe 59.

[0052] After creating one stroke's worth of material, the rod 55 is cut and retrieved.

[0053] (d) The process described in (c) above is repeated sequentially to carry out the planned construction work and create a horizontal ground improvement body.

[0054] (e) Once the planned construction of the area to be built is complete, the measuring device body 23 of the construction diameter measuring device 21 is then launched from the injection device body 13, as shown in Figure 3. The measuring device body 23 launched from the injection device body 13 penetrates to the boundary between the unhardened improved body and the unimproved ground, and its pointed tip hits the wall of the unimproved ground (it cannot penetrate any further) and stops moving. During this process, the wire 25 is unfurled straight out by the amount the measuring device body 23 has moved, as shown in Figure 3. The distance the measuring device body 23 has traveled from launch to stopping is then measured based on the amount of wire 25 unfurled, which is connected to the measuring device body 23. The measured amount of wire 25 unfurled is approximately equal to the diameter of the improved body being built, so the measured amount of wire unfurled can be considered as the construction diameter.

[0055] The above (e) procedure is specifically carried out in the following steps.

[0056] First, rotate the spraying device 1 by a predetermined angle (position) so that the pointed tip of the measuring device body 23 points directly downwards (as shown in Figure 2(a)). At this point, reset the rangefinder 27 to set the measurement distance to 0. By pointing the measuring device body 23 directly downwards, the launched measuring device body 23 will propel itself straight downwards due to the pressure of the applied high-pressure water and its own weight.

[0057] Next, high-pressure water generated by the high-pressure pump is supplied to the high-pressure water channel 31 and the guide hole 32, and the measuring device body 23 is ejected from the injection device body 13 by the high-pressure water. Once the measuring device body 23 has been ejected from the storage unit 15, the high-pressure water is immediately stopped. When the measuring device body 23 is ejected from the storage unit 15, the switch 43 on the measuring device body 23 automatically switches ON and the vibrator 41 is activated.

[0058] Simultaneously with the launch of the measuring device body 23, the wire 25 is loosened. As a result, the wire 25 connected to the back of the measuring device body 23 is extended through the guide holes 33 and 32, following the forward movement of the launched measuring device body 23. The measuring device body 23, launched from the injection device body 13, advances to the boundary between the unhardened improved material and the unimproved ground, where its pointed tip hits the wall of the unimproved ground (and thus it can no longer advance) and stops moving.

[0059] When the tip of the measuring device body 23 hits the wall of the unimproved ground and the wire 25 stops being extended, pull the wire 25 up slightly, then loosen the wire again, and when it stops at the same position, check the measurement result of the distance meter 27. Since the measurement result of the distance meter (extension length) is approximately equal to the diameter of the improved body being constructed, the measured wire extension amount can be treated as the construction diameter.

[0060] As mentioned above, the measurement value of the distance meter 27 may be considered as the construction diameter directly, but a predetermined correction process (for example, adding the length of the measuring device body 23 to the measured extension length) may be applied to the measurement value of the distance meter, and the value after the correction process may be treated as the construction diameter. Performing such a correction process makes it possible to determine the construction diameter more accurately. In addition, a display device for displaying the construction diameter measured by the construction diameter measuring device of this embodiment may be provided, and the measurement value of the distance meter 27 may be displayed as the construction diameter on this display device, or the value after the correction process described above may be displayed as the construction diameter.

[0061] Then, once the measurement of the drilling diameter is complete, the wire 25 is manually pulled to house the measuring device body 23 in the storage compartment 15 of the injection device 1.

[0062] In this embodiment, the diameter of the improved body is measured after the construction of the planned growth portion is completed. However, the timing of the diameter measurement is not limited to this, and the measurement can be performed at any time during the construction of the improved body. [Explanation of symbols]

[0063] 1. Injection device (tip monitor) 3 drilling bits 5 Injection part (injection port) 7 Mud removal port 9. Horizontal and oscillation angle sensors 11. Ground pressure sensor 13 Injection device body 15 Storage Unit 17 Opening 21 Formation diameter measuring device 23 Measuring device main body 25 wires 27. Distance meter (measuring means) 31 High-pressure water channel 32 Guide Hall (Guidance Passage) 33 Guide Hall (Guidance Passage) 35 Packing 41 Vibrator 43 switches 45 batteries 51 Mouth tube 53 Construction Machines 55 Rod (perforated tube) 59 Sludge discharge pipe

Claims

1. A ground improvement diameter measuring device provided in a jetting device used in a high-pressure jetting mixing method for creating a ground improvement body horizontally, for measuring the diameter of the ground improvement body created by the jetting device, A measuring device body is provided in the injection device and is emitted in the radial direction of the ground improvement body, A pressurizing means for launching the measuring device body from the injection device, A wire is provided, with one end connected to the measuring device body and designed to be extended by firing from the measuring device body. A measuring means for measuring the distance traveled by the measuring device body launched from the injection device based on the wire payout amount, A construction diameter measuring device for use in high-pressure jet agitation construction methods, characterized by having the following features.

2. The construction diameter measuring device used in the high-pressure jet mixing method according to claim 1, characterized in that the measuring device body is equipped with a vibrator for generating vibrations.

3. The measuring device body is equipped with a switch for operating the vibrator. The construction diameter measuring device used in the high-pressure injection mixing method according to claim 2, characterized in that the switch automatically activates the vibrator when the measuring device body is ejected from the injection device.

4. The construction diameter measuring device used in the high-pressure jet stirring method according to claim 1, characterized in that the pressurizing means includes a pump that generates high-pressure water for ejecting the measuring device body.

5. A jetting device used in a high-pressure jetting and mixing method for creating a ground improvement body horizontally, and equipped with the creation diameter measuring device described in claim 1, The diameter measuring device according to claim 1, A storage section for storing the measuring device body of the aforementioned diameter measuring device so that it can be launched, A spray nozzle for spraying liquid hardening agent, A spray device used in a high-pressure injection mixing method, characterized by having the following features.

6. The injection device used in the high-pressure injection mixing method according to claim 5, characterized in that the opening leading to the storage section is formed in a tapered shape that widens outward.

7. A high-pressure injection agitation method using the injection device described in claim 5 or 6, A process of drilling a hole horizontally to a target distance using a drilling device equipped with a drilling diameter measuring device attached to the tip of a rod, The process involves withdrawing the rod while rotating or oscillating the rod, and spraying the liquid hardening agent from the spraying part of the spraying device. A step of launching the measuring device body of the diameter-forming measuring device from the injection device and measuring the distance traveled by the measuring device body based on the length of the wire extended from the measuring device body, A high-pressure injection mixing method characterized by including [the following].

Images