Injection material injection mechanism

Abstract

To provide an injection material injection mechanism capable of mechanically comprehending bored depth and injection depth of injection material.SOLUTION: An injection material injection mechanism 10 is provided with: an injection hose 30 injecting injection material into the ground G by specific injection depth; a recording device 60 recording injection time of the injection material and at least one of an injection amount and injection pressure of the injection material; an identifier 40 provided on an outer peripheral surface of the injection hose 30; and a detection device 50 installed on the ground and detecting the injection depth through detection of the identifier 40.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an injection material injection mechanism.

Background Art

[0002] The following Patent Document 1 describes a chemical solution injection method for controlling the injection pressure or injection rate of a chemical solution to be injected into a target ground.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the chemical solution injection method of Patent Document 1, the injection pressure of the chemical solution is dynamically controlled by methods such as continuously increasing or decreasing the injection pressure of the chemical solution, repeating the increase and decrease of the injection pressure within a sawtooth-shaped set range, or gradually increasing in a pulsed manner.

[0005] This chemical solution injection method is a method applicable to water stop work, ground reinforcement work, anchor work, etc. In such a method, in order to expand the chemical solution injection range in the vertical direction, an injection hose for injecting an injection material such as a chemical solution may be moved in the vertical direction to inject the injection material at different depths.

[0006] When moving the injection hose in the vertical direction in this way, it is required to grasp the injection pressure and injection amount of the injection material for each depth. However, a mechanism for associating and managing the injection pressure and injection amount of the injection material with the depth has not been conventionally provided.

[0007] In order to manage the injection pressure and injection volume of the injection material in relation to the depth, it is necessary to know the injection depth of the injection material. Also, for example, when excavating the ground with an excavation rod, it is necessary to know the excavation depth.

[0008] In conventional excavation methods, the excavation depth is often managed by visual inspection by workers. However, generally, since the outer peripheral surfaces of the excavation rod and the injection hose are uniformly formed along the axial direction, errors are likely to occur when managing the excavation depth or injection depth by visual inspection by workers.

[0009] In view of the above facts, an object of the present invention is to provide an injection material injection mechanism capable of mechanically grasping the excavation depth and the injection depth of the injection material.

Means for Solving the Problems

[0010] A drilling machine according to one aspect includes a drilling rod inserted into the ground, an identifier provided on the outer peripheral surface of the drilling rod, and a detection device installed on the ground that detects the identifier to detect the drilling depth.

[0011] In a drilling machine according to one aspect, an identifier is provided on the outer peripheral surface of the drilling rod. This identifier is detected by a detection device installed on the ground, and thereby the drilling depth is detected. That is, the drilling depth can be mechanically grasped.

[0012] The injection material injection mechanism according to claim 1 includes an injection hose inserted into the ground for injecting the injection material into the ground at a predetermined injection depth, a recording device that records the injection time of the injection material and at least one of the injection volume and injection pressure of the injection material, an identifier provided on the outer peripheral surface of the injection hose, and a detection device installed on the ground that detects the identifier to detect the injection depth.

[0013] In the injection material injection mechanism according to claim 1, an identifier is provided on the outer peripheral surface of the injection hose. This identifier is detected by a detection device installed on the ground, and the injection depth of the injection material is detected. That is, the injection depth of the injection material can be mechanically grasped.

[0014] In addition, for each injection depth, the injection time of the injection material can be associated with at least one of the injection amount and the injection pressure. Therefore, it is easy to check the as-built condition against the injection plan of the injection material.

[0015] The injection material injection mechanism according to claim 2 is the injection material injection mechanism according to claim 1, wherein the identifier is a color marker formed planar over the entire circumference of the outer peripheral surface of the injection hose, and the detection device is a device capable of reading the color of the color marker.

[0016] In the injection material injection mechanism according to claim 2, the color marker is formed over the entire circumference of the outer peripheral surface of the injection hose. Thereby, even if the injection hose rotates, the detection device can read the color and detect the depth of the injection section.

[0017] In addition, the color marker is formed planar. Therefore, compared with markers such as linear graduations, the detectable range is wide and errors are less likely to occur. Also, it is easy to read even if the outer peripheral surface of the injection hose is soiled with soil or the like.

[0018] The injection material injection mechanism according to claim 3 is the injection material injection mechanism according to claim 2, wherein the color marker includes a first coating portion coated with a first color, and a second coating portion provided either below or above adjacent to the first coating portion and coated with a second color.

[0019] In the injection material injection mechanism according to claim 3, the color marker includes a first coating portion coated with a first color and a second coating portion coated with a second color.

[0020] The second coating portion is provided either below or above adjacent to the first coating portion. Thereby, the order of the colors detected by the detection device is different when the injection hose is moved upward and when it is moved downward. Thereby, the moving direction of the injection hose can be mechanically grasped.

[0021] The grouting material injection mechanism of claim 4 is the grouting material injection mechanism of any one of claims 1 to 3, wherein the injection hose is provided with a removal mechanism for removing any adhering matter adhering to the identifier.

[0022] In the grouting material injection mechanism of claim 4, the removal mechanism can remove any material adhering to the identifier. This makes it easier to read the identifier, even if the outer circumferential surface of the injection hose becomes soiled with dirt or the like, as the dirt or the like can be removed. Effect of the Invention

[0023] According to the present invention, the excavation depth and the injection depth of the grouting material can be mechanically grasped. [Brief description of the drawings]

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0025] Hereinafter, a drilling machine and an injection material injection mechanism according to an embodiment of the present invention will be described with reference to the drawings. Components denoted by the same reference numerals in each drawing mean the same components. However, unless otherwise specified in the specification, each component is not limited to one, and a plurality of them may exist.

[0026] In addition, descriptions of overlapping configurations and reference numerals in each drawing may be omitted. Note that the present invention is not limited to the following embodiments, and appropriate changes such as omitting configurations or replacing them with different configurations can be made within the scope of the object of the present invention.

[0027] <Injection material injection mechanism> The injection material injection mechanism 10 according to an embodiment of the present invention is a mechanism for injecting an injection material into the ground G by the double packer method to perform ground improvement. As shown in FIG. 1, the injection material injection mechanism 10 includes an injection pipe 20, an injection hose 30, an identifier 40, a detection device 50, and a recording device 60.

[0028] The type of the injection material is not particularly limited, and in addition to liquids such as water glass, cement milk, and water added with a thickening agent, powder ground improvement materials and the like can be adopted.

[0029] (Injection pipe) The injection pipe 20 is a steel cylindrical body inserted into a drilled hole GH formed in the ground G. On the peripheral wall of the injection pipe 20, discharge ports 22 are formed at predetermined intervals (interval L1) along the cylinder axis direction for discharging the injection material discharged from the injection hose 30 described later to the outside of the injection pipe 20.

[0030] The discharge port 22 is blocked by a rubber sleeve 24 covering the outer periphery of the injection pipe 20 except when the injection material is discharged.

[0031] (Injection hose) The injection hose 30 is a flexible pipe body inserted into the injection pipe 20, and a discharge port 32 is formed on the peripheral wall of the tip portion. Two packing materials 34 are arranged before and after the discharge port 32 (before and after in the axial direction of the injection hose 30) (so-called double packer).

[0032] The discharge port 32 is an opening for discharging the injection material sent into the injection hose 30 from a liquid feeding device (not shown) to the outside of the injection hose 30 and inside the injection pipe 20.

[0033] The packing material 34 is a rubber balloon that expands by water pressure. The outer diameter of the packing material 34 is smaller than the inner diameter of the injection hose 30 in the deflated state. Therefore, in the deflated state of the packing material 34, as shown in Fig. 2(A), the injection hose 30 can be moved inside the injection pipe 20.

[0034] Also, the outer diameter of the packing material 34 can be deformed to a dimension larger than the inner diameter of the injection pipe 20 in the inflated state. Therefore, as shown in Fig. 2(B), by inflating the packing material 34, the packing material 34 can be brought into close contact with the inner peripheral wall of the injection pipe 20. Thereby, the space V1 in which the discharge port 32 is arranged is sealed inside the injection pipe 20.

[0035] Therefore, as indicated by the arrow in FIG. 2(C), the injection material discharged from the discharge port 32 is not discharged into the space V2 other than the space where the discharge port 32 is disposed inside the injection pipe 20, but is discharged to the outside of the injection pipe 20 through the discharge port 22 of the injection pipe 20.

[0036] At this time, the rubber sleeve 24 is elastically deformed by the discharge pressure of the injection agent, and a gap is formed between the rubber sleeve 24 and the outer peripheral surface of the injection pipe 20. The injection material is discharged to the outside of the injection pipe 20 through this gap. The injection material discharged to the outside of the injection pipe 20 is injected into the ground G and penetrates into the ground G as shown in sections E1, E2, and E3 of FIGS. 3(A) to 3(C).

[0037] In this way, the injection material discharged from the injection hose 30 is injected into the ground G through the discharge port 22 of the injection pipe 20. Since the discharge ports 22 of the injection pipe 20 are arranged at a predetermined interval L1, the injection material can be injected into the ground G at intervals of every interval L1 or multiples of the interval L1.

[0038] (Identifier) As shown in FIG. 1, the identifier 40 is a color marker arranged at a predetermined interval (interval L2) in the axial direction of the injection hose 30.

[0039] The identifier 40 is formed in a planar shape over the entire circumference of the outer peripheral surface of the injection hose 30. "Formed over the entire circumference" means that it is formed in the entire circumferential region of the injection hose 30. In contrast, an identifier formed only in a half region in the circumferential direction of the injection hose 30 is not referred to as "formed over the entire circumference".

[0040] The identifier 40 is formed by applying paint to the outer peripheral surface of the injection pipe 20. The identifier includes a first coating portion 42 coated with red paint as the first color and a second coating portion 44 coated with green paint as the second color. The second coating portion 44 is adjacent to the first coating portion 42, disposed below the first coating portion 42, and formed with a smaller width along the axial direction than the first coating portion 42.

[0041] The colors of the first coating portion 42 and the second coating portion 44 are not particularly limited, but it is preferable to select a combination of colors that is easy to mechanically identify. The "combination of colors that is easy to mechanically identify" is, for example, a combination of colors in a complementary color relationship such as red and green. Or, for example, a combination of colors with a large difference in lightness such as white and black.

[0042] As the interval L2 of the identifier 40, various dimensions can be adopted. For example, predetermined dimensions conforming to the metric system such as every 1 [m] or 2 [m] can be adopted. Or, a dimension equal to the interval L1 between the discharge ports 22 of the injection pipe 20 may be adopted. In the present embodiment, the interval L2 is made equal to the interval L1.

[0043] (Detection device) The detection device 50 is installed on the ground outside the ground G, detects the identifier 40, and detects the injection depth of the injection material. The detection device 50 is formed including an imaging unit such as a video camera, and this imaging unit images the outer peripheral surface of the injection hose 30.

[0044] Further, the detection device 50 includes an analysis unit such as a CPU. The analysis unit is capable of detecting the color of the image captured by the imaging device. And this analysis unit is capable of detecting the presence or absence, hue, and lightness of the identifier 40 from the image captured by the imaging device. Also, although details will be described later, the analysis unit detects the injection depth of the injection material from the change over time of the image. Furthermore, the analysis unit records the time when the captured image is recorded.

[0045] (Recording device) The recording device 60 is a logger that records the injection time of the injection material, the injection volume, and the injection pressure of the injection material. The injection volume and the injection pressure of the injection material are transmitted from a liquid sending device (not shown) that sends the injection material into the inside of the injection hose 30 to the recording device 60.

[0046] In addition to the detection device 50 and the recording device 60, the injection material injection mechanism 10 may be provided with display means such as a monitor that notifies an operator of the detection result of the identifier 40 by the detection device 50 and the recording result by the recording device 60.

[0047] <Ground improvement method> An example of a method for improving the ground G using the injection material injection mechanism 10 will be described. In order to improve the ground G, as shown in FIG. 1, the injection pipe 20 is inserted into the bored hole GH formed in the ground G.

[0048] As shown in FIG. 3(A), it is preferable to insert the injection pipe 20 into the ground G so that the injection material injected from the discharge port 22A, which is the tip discharge port, reaches the lower end of the region E0 to be ground-improved.

[0049] In other words, it is preferable to control the injection pressure and the injection volume of the injection material so that the injection material injected from the discharge port 22A, which is the tip discharge port, reaches the lower end of the region E0 to be ground-improved.

[0050] Next, as shown in FIG. 3(A), the injection hose 30 is inserted into the injection pipe 20. At this time, the insertion depth of the injection hose 30 is adjusted so that the discharge port 22A is disposed between the two packing materials 34 in the injection hose 30.

[0051] The insertion depth of the injection hose 30 is grasped by the identifier 40. In order to grasp the insertion depth of the injection hose 30 by the identifier 40, as an example, first, when the distance between the discharge port 22A and the detection device 50 is dimension L3, an identifier 40A is formed in advance at a portion at a distance of dimension L3 from the discharge port 32. The identifier 40A is the most upstream identifier in the injection hose 30. Also, identifiers 40B and 40C are formed at intervals of the above-mentioned interval L2 (= interval L1) downward from the identifier 40A.

[0052] And by making the detection device 50 detect the identifier 40A, it is possible to make the discharge port 22A be disposed between the two packing materials 34 in the injection hose 30. That is, the position of the discharge port 22A can be made the injection depth of the injection material. Here, what is detected is the first coating portion 42 in the identifier 40A.

[0053] After adjusting the insertion depth of the injection hose 30, the injection material is discharged from the discharge port 32 of the injection hose 30, and the injection material is injected into the ground G through the discharge port 22A. In FIG. 3(A), the section improved by the injection material discharged from the discharge port 22A is indicated by a broken line as section E1.

[0054] Next, as shown in FIG. 3(B), the injection hose 30 is pulled up to adjust the insertion depth of the injection hose 30. At this time, by making the detection device 50 detect the identifier 40B adjacent to the identifier 40A, it is possible to make the discharge port 22B adjacent to the discharge port 22A be disposed between the two packing materials 34 in the injection hose 30. That is, the position of the discharge port 22B can be made the injection depth of the injection material.

[0055] Note that the timing for pulling up the injection hose 30 is preferably the timing when the injection material injected from the discharge port 22A into the ground G is expected to reach the lower end of the area E0 to be ground-improved. To determine this timing, it is preferable to manage the injection time after grasping the injection pressure and injection amount of the injection material, and further, it is more preferable to confirm the injection pressure, injection amount, and injection time of the injection material using the above-described display device.

[0056] When the insertion depth of the injection hose 30 is adjusted, the injection material is injected into the ground G through the discharge port 22B. In FIG. 3(B), the section of the ground improved by the injection material discharged from the discharge port 22B is indicated by a broken line as section E2.

[0057] Next, as shown in FIG. 3(C), the injection hose 30 is pulled up to adjust the insertion depth of the injection hose 30. At this time, by making the detection device 50 detect the identifier 40C adjacent to the identifier 40B, the discharge port 22C adjacent to the discharge port 22B can be arranged between the two packing materials 34 in the injection hose 30. That is, the position of the discharge port 22C can be made the injection depth of the injection material.

[0058] When the insertion depth of the injection hose 30 is adjusted, the injection material is injected into the ground G through the discharge port 22C. In FIG. 3(C), the section of the ground improved by the injection material discharged from the discharge port 22C is indicated by a broken line as section E3.

[0059] In the above example, the example of adjusting the insertion depth of the injection hose 30 while discharging the injection material from the discharge port 32 has been described. However, each time the sections E1 and E2 are ground-improved, the discharge of the injection material may be interrupted once, and the discharge may be resumed after the adjustment of the insertion depth of the injection hose 30 is completed.

[0060] <Management of Injection Depth, Injection Amount, and Injection Pressure> In order to improve the ground in the vertical direction without interruption in the area E0, the sections E1, E2, and E3 need to have dimensions of at least the vertical dimension and a dimension of not less than the interval L1. Also, the lateral dimensions of the sections E1, E2, and E3 need to be not less than the lateral dimension of the area E0.

[0061] Furthermore, in order to improve the ground in the area E0 with a desired quality, the concentration of the injection material in the area E0 needs to be not less than a predetermined concentration.

[0062] Thus, in order to control the dimensions of the sections E1, E2, and E3, it is preferable to manage by associating the "injection pressure" and the "injection time" of the injection material discharged from the discharge ports 22A, 22B, and 22C for each "injection depth" where the injection material is injected into each section. Also, in order to control the concentration of the injection material in the sections E1, E2, and E3, it is preferable to manage by associating the "injection amount" and the "injection time" of the injection material for each injection depth.

[0063] Furthermore, in order to accurately control the dimensions of the sections E1, E2, and E3 and the concentration of the injection material in the sections E1, E2, and E3, it is more preferable to manage by associating the "injection pressure and injection amount" and the "injection time" of the injection material for each "injection depth".

[0064] (Management of injection depth) In FIG. 4(A), with the state where the detection device 50 detects the identifier 40A as the initial state, the relationship between the color intensity detected by the detection device 50 and time is shown as a schematic graph. The analysis unit of the detection device 50 is capable of detecting the color of the image as described above.

[0065] In FIG. 4(A), the color intensity on the vertical axis indicates brightness and chroma. In the following description, "strong (weak) color intensity" indicates high (low) brightness and chroma, respectively.

[0066] The solid line K1 is a graph showing the color intensity of the red hue, and the dashed line K2 is a graph showing the color intensity of the green hue. The unpainted outer peripheral surface of the injection hose 30 (see FIG. 1) is black and has weak color intensities of red and green. On the other hand, the first coating portion 42 of red and the second coating portion 44 of green each have strong color intensities of red and green.

[0067] That is, in the portion of the solid line K1 shown in FIG. 4(A) where the color intensity is strong, the detection device 50 detects the first coating portion 42 in any of the identifiers 40A, 40B, 40C (see FIGS. 3(A) to (C)). Therefore, in these portions, the injection liquid is in a state where it can be injected from any of the discharge ports 22A, 22B, 22C into the ground G.

[0068] Also, in the portion of the dashed line K2 where the color intensity is strong, the detection device 50 detects the second coating portion 44 in any of the identifiers 40A, 40B, 40C.

[0069] The change over time of the solid line K1 and the dashed line K2 in FIG. 4(A) indicates that after the portion with a strong color intensity in the solid line K1, the portion with a strong color intensity in the dashed line K2 is detected. That is, after the first coating portion 42 shown in FIG. 1 is detected, the second coating portion 44 is detected. This indicates that as the injection hose is pulled out, the second coating portion 44 below is detected following the first coating portion 42 above.

[0070] From the graph of FIG. 4(A) based on the information detected by the detection device 50, the following can be read.

[0071] The initial state where the detection device 50 detects the identifier 40A, that is, the position of the discharge port 22A is set as the injection depth (injecting the injection material in the section E1), was maintained for the time indicated by the period T1.

[0072] After the elapse of period T1, the injection hose 30 is pulled up, and the detection device 50 is in a state of detecting the identifier 40B, that is, the position of the discharge port 22B is set as the injection depth (injecting the injection material in section E2), and this state is maintained for the time shown in period T2.

[0073] After the elapse of period T2, the injection hose 30 is pulled up, and the detection device 50 is in a state of detecting the identifier 40C, that is, the position of the discharge port 22C is set as the injection depth (injecting the injection material in section E3), and this state is maintained for the time shown in period T3.

[0074] (Management of injection amount and injection pressure) In FIG. 4(B), the relationship between the injection time of the injection material recorded by the recording device 60 and the injection amount of the injection material (injection flow rate Q [m 3 / s] per unit time) is shown as a schematic graph. Also, in FIG. 4(C), the relationship between the injection time of the injection material recorded by the recording device 60 and the injection pressure P [Pa] of the injection material is shown as a schematic graph.

[0075] Here, if the periods T1, T2, and T3 shown in FIG. 4(A) are illustrated in FIG. 4(B), the relationship between the injection time of the injection material and the injection amount of the injection material in sections E1, E2, and E3 can be grasped respectively. Similarly, if the periods T1, T2, and T3 shown in FIG. 4(A) are illustrated in FIG. 4(C), the relationship between the injection time of the injection material and the injection pressure of the injection material in sections E1, E2, and E3 can be grasped respectively.

[0076] In the example shown in FIGS. 4(A) to (C), the injection material is injected in the order of sections E1, E2, and E3, but the embodiments of the present invention are not limited to this. For example, in FIGS. 5(A) to (C), an example of injecting the injection material in the order of sections E1, E3, and E2 is shown.

[0077] From the graph of FIG. 5(A) based on the information detected by the detection device 50, the following can be read in the same manner as above.

[0078] The initial state in which the detection device 50 detects the identifier 40A, that is, the position of the discharge port 22A is set as the injection depth (injecting the injection material in the section E1), has been maintained for the time indicated by the period T1.

[0079] After the elapse of the period T1, the injection hose 30 is pulled up, and the state in which the detection device 50 detects the identifier 40B, that is, the position of the discharge port 22B is set as the injection depth (injecting the injection material in the section E2), has been maintained for the time indicated by the period T2.

[0080] However, since the period T2 is a short period, this period T2 is the period in which the identifier 40B is detected while the injection hose 30 is being pulled up.

[0081] Thereafter, the state in which the detection device 50 detects the identifier 40C, that is, the position of the discharge port 22C is set as the injection depth (injecting the injection material in the section E3), has been maintained for the time indicated by the period T3.

[0082] After the elapse of the period T3, the injection hose 30 is "pushed down", and the state in which the detection device 50 detects the identifier 40B, that is, the position of the discharge port 22B is set as the injection depth (injecting the injection material in the section E2), has been maintained for the time indicated by the period T4.

[0083] The fact that the injection hose 30 is "pushed down" can be grasped from the fact that, following the portion with strong color intensity on the broken line K2, the portion with strong color intensity on the solid line K1 is detected. That is, after the second coating portion 44 shown in FIG. 1 is detected, the first coating portion 42 is detected. This indicates that, by pushing down the injection hose, the upper first coating portion 42 is detected following the lower second coating portion 44.

[0084] <Function and Effect> As described above, in the injection material injection mechanism 10 according to the embodiment of the present invention, as shown in FIG. 1, an identifier 40 is provided on the outer peripheral surface of the injection hose 30. This identifier 40 is detected by a detection device 50 installed on the ground, and the injection depth of the injection material is detected. That is, the injection depth of the injection material can be mechanically grasped.

[0085] In addition, for each injection depth, the injection time of the injection material can be associated with at least one of the injection volume and the injection pressure (both in this embodiment), so that it is easy to check the conformity of the injection plan of the injection material. Also, when an abnormal value occurs in the injection volume or injection pressure, the depth at which the abnormal value occurs can be easily grasped.

[0086] Further, the identifier 40 is a color marker and is formed over the entire circumference of the outer peripheral surface of the injection hose 30. Thereby, even if the injection hose 30 rotates, the detection device 50 can read the color and detect the depth of the injection section.

[0087] In addition, the identifier 40 is formed in a planar shape. Therefore, compared with markers such as linear graduations, the detectable range is wide and errors are less likely to occur. Also, it is easy to read even if the outer peripheral surface of the injection hose 30 is soiled with soil or the like.

[0088] From the viewpoint of making the identifier 40 easier to read, the injection hose 30 may be provided with a removal mechanism for removing deposits adhering to the identifier 40. Examples of such a removal mechanism include a water injection device that injects water toward the identifier 40 and a cleaning device such as a wiper that wipes the surface of the identifier 40.

[0089] The water injection device and the cleaning device are preferably provided directly below or directly above the identifier 40 in the injection hose 30. The direct lower part or the direct upper part is a part within about 10 cm below or above the identifier 40 generally.

[0090] Further, the identifier 40 includes a first coating portion 42 coated with red, which is the first color, and a second coating portion 44 coated with green, which is the second color. And the second coating portion 44 is provided below and adjacent to the first coating portion 42.

[0091] As a result, the order of the colors detected by the detection device 50 is different when the injection hose 30 is moved upward and when it is moved downward. Thus, the moving direction of the injection hose 30 can be mechanically grasped.

[0092] In this embodiment, each identifier 40 is formed with two colors, but the embodiments of the present invention are not limited to this. For example, it may be formed with one color like the identifier 70 shown in FIG. 6(A). In this case, the detection device 50 detects and grasps the pulling up and pushing down of the injection hose 30 by detecting the movement of the injection hose 30.

[0093] Also, as in the identifiers 72A, 72B, and 72C shown in FIG. 6(B), the color may be changed for each identifier. By doing so, the injection depth can be easily grasped.

[0094] Furthermore, as in the identifier 74 shown in FIG. 6(C), the identifier may be formed by a scale. It is preferable to also write the dimensions on the scale.

[0095] Moreover, as in the identifier 76 shown in FIG. 6(D), the identifier may be formed by a two-dimensional code such as a QR code (registered trademark) or a barcode. That is, it is only necessary to be able to mechanically grasp the injection depth.

[0096] Thus, various aspects can be applied as the identifier in the present invention, and it is not necessary to be formed "over the entire circumference" and "in a planar shape" on the outer peripheral surface of the injection hose 30 like the identifier 40 described above.

[0097] For example, the above-described identifier 76 is not formed "over the entire circumference" of the outer peripheral surface of the injection hose 30, and the identifier 74 is not formed "in a planar shape" on the outer peripheral surface of the injection hose 30.

[0098] Also, the identifiers 40, 70, 72A, 72B, and 72C are formed using colors. However, the identifiers using these colors may also be formed linearly instead of planar, and the line width is not particularly limited. That is, in each of these cases, it is sufficient that the detection device 50 can identify the identifier. If the identifier can be identified, the identifier using color can be formed not by coating but by using an adhesive tape or the like.

[0099] Also, in the present embodiment, an example in which the identifier 40 is formed at three locations has been described. However, the number of locations of the identifier 40 can be appropriately selected according to the depth of the region E0 where ground improvement is desired and the interval L1 between the discharge ports 22.

[0100] Also, in the present embodiment, an example in which ground improvement is performed by a single boring GH has been described. However, a plurality of borings GH may be formed. When a plurality of borings GH are formed, the injection pipes 20 and the injection hoses 30 may be inserted into these plurality of borings GH respectively for ground improvement.

[0101] However, when simultaneously performing ground improvement from adjacent borings GH to each other, it is preferable not to inject the injection material at the same injection depth simultaneously. If the injection material is injected at the same injection depth simultaneously, the pressure in the ground G may become excessively high, and the ground G may float. Therefore, it is preferable to inject at different injection depths simultaneously.

[0102] <Modification Example> The injection material injection mechanism in the present invention is used for the double packer method using two packer materials 34. However, the embodiments of the present invention are not limited to this. The injection material injection mechanism can be used for various methods (such as the double tube strainer method) of injecting the injection material into the ground G. Also, in various methods, the injection material may be injected into the ground G by a single tube configuration tube body (for example, only the injection hose 30) without using an outer tube such as the injection pipe 20.

[0103] Furthermore, the present invention can also be applied not only to the injection material injection mechanism but also to the drilling machine 12 shown in FIG. 7. The drilling machine 12 may include a drilling rod 80 inserted into the ground, an identifier 40 provided on the outer peripheral surface of the drilling rod 80, and a detection device 50 installed on the ground for detecting the identifier 40 to detect the drilling depth. By providing the identifier 40 on the drilling rod 80 in this way, the drilling depth can be mechanically grasped.

Explanation of Reference Numerals

[0104] 10 Injection material injection mechanism 12 Drilling machine 20 Injection pipe 30 Injection hose 32 Discharge port 34 Packing material 40 Identifier 40A Identifier 40B Identifier 40C Identifier 42 First coating part 44 Second coating part 50 Detection device 60 Recording device 70 Identifier 72A Identifier 74 Identifier 76 Identifier 80 Drilling rod

Claims

1. an injection hose that is inserted into the ground and injects an injection material into the ground at a predetermined injection depth; a recording device for recording the injection time of the injection material and at least one of the injection amount and injection pressure of the injection material; An identifier provided on an outer peripheral surface of the injection hose; A detection device that is installed on the ground and detects the identifier to detect the injection depth; An injection mechanism for injection of injection material.

2. The identifier is a color marker formed in a planar shape around the entire outer circumferential surface of the injection hose, The detection device is a device capable of reading the color of the color marker.

2. The grout injection mechanism of claim 1.

3. The color marker is a first coating portion coated with a first color; A second application section provided adjacent to the first application section, either below or above the first application section, and coated with a second color; Equipped with 3. The grout injection mechanism of claim 2.

4. The injection material injection mechanism according to any one of claims 1 to 3, wherein the injection hose is provided with a removal mechanism for removing any adhering matter adhering to the identifier.

Images