Filling inspection device and filler injection method

Abstract

To ensure that the gap between an existing pipe and an inner tubular body to be installed during construction is properly filled with filler material.SOLUTION: There is provided a filling inspection device 100 that inspects the filling status of filling material between an existing pipe and a tubular body provided inside the existing pipe. The filling inspection device 100 includes a float 10 that moves up and down according to the specific gravity of fluid in the inspection hole provided at the bottom of the tubular body, and a detector 20 for detecting the amount of movement of the float. The float has a tapered shape at least partially narrowed toward the lower end side of the float on the portion that contacts the fluid.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a filling inspection device and a filler injection method.

Background Art

[0002] Conventionally, there has been a method of lining the inside of an aging existing pipe in order to rehabilitate a sewer pipe or agricultural water pipe that is buried underground and has been used for a long time and has deteriorated. As one of these rehabilitation methods, a method of providing a separate new pipe (hereinafter referred to as a lining pipe or a tubular body) inside the existing pipe is known. In this method, a backfill material made of a cement-based filler is injected using an injection device between the inner surface of the existing pipe and the outer surface of the lining pipe disposed inside thereof. When injecting and filling the backfill material into the gap between the existing pipe and the lining pipe, a supply hose for the backfill material is inserted into the gap between the existing pipe and the lining pipe from one end of the existing pipe and the lining pipe provided inside the existing pipe, and the backfill material is injected and filled. This method forms a three-layer composite pipe composed of an existing pipe, a filler, and a lining pipe, and can restore the strength of the aging existing pipe to a strength comparable to that of a newly installed pipe.

[0003] However, in the rehabilitation method of injecting and filling the backfill material into the gap between the existing pipe and the lining pipe, since the filling state of the backfill material cannot be visually observed, there is a problem that it is impossible to confirm that the backfill material is surely filled around the lining pipe. If the backfill material is not surely filled around the lining pipe, voids may occur around the lining pipe, and there is a risk that the lining pipe will not be firmly supported inside the existing pipe. As a method of inspecting the presence or absence of such voids that cause insufficient strength, tapping is performed from the inner surface of the lining pipe, and the filling state is determined by a person based on the reverberation sound. However, this requires skill and quantitative judgment is difficult.

[0004] As a technique for avoiding such problems, for example, Patent Document 1 discloses a construction inspection method for a backfill material for rehabilitation pipes that can inspect the presence or absence of construction defects. In this inspection method, an electromagnetic wave transmitting and receiving device having an electromagnetic wave transmitting means for transmitting electromagnetic waves and a reflected electromagnetic wave receiving means for receiving reflected electromagnetic waves from an object is used to inspect for construction defects in the backfill mortar of a rehabilitation pipe reinforced by arranging a metal reinforcing material along the circumferential direction.

[0005] Further, as an example of the case of using a shoring device during construction, Patent Document 2 discloses a rehabilitation method for existing deteriorated pipes that does not require the attachment and removal work of the attachment member of the backfill material injection nozzle and can fill the gap between the existing deteriorated pipe and the lining pipe while confirming the filling status of the backfill material. In this method, the shoring device is inserted into the lining pipe newly installed in the existing deteriorated pipe, the annular frame is supported in the lining pipe by the supporting means, three or more hollow rod bodies are arranged in the longitudinal direction of the lining pipe, their tips are inserted into the injection holes of the lining pipe, a backfill material supply hose is connected to the connection port at the base end of the middle hollow rod body, the base ends of the front and rear hollow rod bodies are left open, the backfill material is discharged from the backfill material discharge port near the tip of the middle hollow rod body, and while confirming the filling status from the outflow state of the backfill material from the base ends of the front and rear hollow rod bodies, the gap between the existing deteriorated pipe and the lining pipe is filled with the backfill material.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] The technique of Patent Document 1 is originally a method for inspecting construction defects after construction is completed. It is originally preferable to perform construction while confirming whether the backfill material is sufficiently filled in the gap between the existing pipe and the lining pipe during construction. Further, in the rehabilitation method premised on the shoring device as in Patent Document 2, its usage scene is limited.

[0008] Furthermore, in order to perform construction without stopping sewage flowing through the existing pipe, stagnant water is left at the bottom between the existing pipe and the lining pipe, and the stagnant water is replaced with a filling material. Then, the backfill material (hereinafter also referred to as the filling material) made of a cement-based filling material may be dispersed and diluted in the stagnant water, or may not be evenly distributed to the place where the filling material should be applied, resulting in voids, and thus curing defects or insufficient strength may occur. Therefore, it is important to confirm during construction whether the filling material having an appropriate specific gravity and viscosity is evenly distributed throughout the construction area, that is, whether the stagnant water has been replaced with the filling material.

[0009] The present invention has been devised in view of such circumstances, and provides a filling inspection device and a filling material injection method capable of confirming that the gap between an existing pipe and a tubular body provided inside the existing pipe is appropriately filled with a filling material during construction.

Means for Solving the Problems

[0010] In order to solve the above problems, there is provided a filling inspection device for inspecting the filling state of a filling material filled between an existing pipe and a tubular body provided inside the existing pipe, the filling inspection device including: a float that moves up and down according to the specific gravity of a flowing substance in an inspection hole provided at the bottom of the tubular body; and a detector that detects the amount of movement of the float, wherein the float has a tapered shape that is narrowed at least partially toward the lower end side of the float in a portion that contacts the flowing substance. In order to accurately detect that the stagnant water (specific gravity: 1.0) is replaced with the filling material (specific gravity: 1.2 or more), the float is composed of a cylindrical portion and a conical portion having a taper toward the tip. The filling inspection device including such a float can accurately detect a slight specific gravity difference between the stagnant water and the filling material in the inspection hole.

[0011] Furthermore, the float may be characterized in that it does not have a shape that widens toward the lower end side of the float. According to this, by not having a shape that widens toward the lower end side, it is possible to avoid the situation where the filling material covers such a shaped portion and the float fails to float with the correct buoyancy.

[0012] Furthermore, the outer shape of the side surface of the float may be cylindrical, and the lower end of the float may be conical. According to this, since the lower end of the float is conical, it is possible to minimize the pressure that receives the filling material invading between the inner wall of the existing pipe and the lower end surface and lifts it upward.

[0013] Furthermore, the detector may be characterized in that it detects the movement amount of the float in multiple stages. According to this, it is possible to monitor the process of being replaced from the stagnant water to the filling material. Also, it is possible to confirm for filling materials with various specific gravities.

[0014] In order to solve the above problems, when applying a filling material between an existing pipe and a tubular body provided inside the existing pipe, a step of providing a plurality of inspection holes at the bottom of the tubular body, a step of attaching the above filling inspection device to the inspection holes, a step of injecting the filling material into the gap between the existing pipe and the tubular body, a step of detecting the specific gravity of the flowing material by the filling inspection device attached to the inspection holes while injecting the filling material, and when the filling inspection device detects a flowing material with a predetermined specific gravity, a step of confirming that the gap between the existing pipe and the tubular body where the inspection hole to which the filling inspection device that has detected the flowing material with the predetermined specific gravity is attached is filled with the filling material are included, and a filling material injection method is provided. According to this, by the filling inspection device attached to the plurality of inspection holes provided at the bottom of the tubular body at the position where filling is to be confirmed detecting the predetermined specific gravity of the flowing material, it is possible to confirm over the entire construction area that the gap between the existing pipe and the tubular body provided inside it is appropriately filled with the filling material during construction.

Effects of the Invention

[0015] As described above, according to the present invention, it is possible to provide a filling inspection device that accurately detects the specific gravity of a flowing material in an inspection hole, and a filling material injection method for confirming that a filling material is appropriately filled in a gap between an existing pipe and a tubular body provided inside the existing pipe during construction.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0017] The filling inspection device and the filling material injection method according to the present invention are used to provide a new tubular body (hereinafter also referred to as a lining pipe, profile, etc.) separately in an existing pipe in order to rehabilitate the existing pipe such as a sewer pipe. When injecting a backfill material (hereinafter simply referred to as a filling material or mortar) made of a cement-based filling material into the gap between the inner surface of the existing pipe and the outer surface of the tubular body using an injection device, it is used to inspect and confirm whether the filling material is properly distributed between the existing pipe and the tubular body, particularly between the bottom of the existing pipe and the bottom of the tubular body, during the construction.

[0018] The mortar used as the backfill material needs to have a high viscosity so that it does not leak from between the inner wall of the existing pipe and the outer wall of the tubular body when injected into the gap therebetween. Mortar with a high viscosity may not spread sufficiently into the gap between the existing pipe and the tubular body because of its low fluidity. In particular, due to the presence of a metal reinforcing material or the like on the outer surface of the tubular body, there may be many irregularities in a direction substantially perpendicular to the direction in which the mortar is injected (axial direction of the tubular body), and there is concern that the possibility increases.

[0019] Although it will be described in detail later, the filling inspection device according to the present invention includes a float that moves up and down according to the specific gravity of a fluid such as water or mortar. Mortar with a high viscosity contains relatively more cement and sand with respect to a unit amount of water, so its specific gravity becomes larger than that of mortar with a low viscosity. This float needs to be able to accurately measure the specific gravity even for mortar with a high viscosity.

[0020] Here, referring to FIG. 8, an example of the shape of a float that is unsuitable for measuring the specific gravity of mortar with a high viscosity will be described. For example, the float 10Z1 shown in FIG. (A) of this figure has a cylindrical shape with the same radius over the up and down of the water level of the fluid, and its bottom surface is flat. With such a shape, there may be a case where mortar with a high viscosity and a large specific gravity enters between the bottom surface of the float 10Z1 and the existing pipe, and a force (gray arrow) that pushes the bottom surface upward from below acts. In such a case, the float 10Z1 cannot measure the accurate specific gravity of the mortar.

[0021] In addition, the float 10Z2 shown in Fig. (B) has no flat surface on its bottom surface. Although the upward pushing force from the bottom like that of the float 10Z1 is alleviated, it has a shape that spreads toward the lower end side (tip side) of the float 10Z2. When it has such a shape, when mortar with high viscosity / high specific gravity is injected and adheres to or covers this shaped portion, a downward pushing force (gray arrow) on the float 10Z2 from top to bottom may act. In such a case, the float 10Z2 cannot accurately measure the specific gravity of the mortar.

[0022] In addition, the float 10Z3 shown in Fig. (C) has a shape that protrudes vertically (parallel to the water level) from the body portion, although the upward pushing force from the bottom like that of the float 10Z2 is alleviated. When it has such a shape, when mortar with high viscosity / high specific gravity is injected and adheres to or covers this shaped portion, a downward pushing force (gray arrow) on the float 10Z3 from top to bottom may act. In such a case, the float 10Z3 cannot accurately measure the specific gravity of the mortar.

[0023] Therefore, the float of the filling inspection device according to the present invention should not have the above-described shape and needs to be able to accurately measure the specific gravity from the stagnant water with a specific gravity of 1.0 to the mortar with a relatively high specific gravity. Hereinafter, the filling inspection device according to the present invention and a filling material injection method using the filling inspection device will be described.

[0024] <First Embodiment> Hereinafter, with reference to Figs. 1 to 5, the filling inspection device 100 in the present embodiment will be described. The filling inspection device 100 inspects the filling status of the filling material filled between an existing pipe and a tubular body provided inside the existing pipe during construction. The filling inspection device 100 includes a float 10 that moves up and down according to the specific gravity of the flowing material in the inspection hole provided at the bottom of the tubular body, a detector 20 that detects the amount of movement of the float 10, and a lighting unit 30 that visually notifies a predetermined amount of movement of the float 10. Note that the specific gravity of the filling material used in this specification is about 1.2 or more.

[0025] As shown in Fig. 1, the float 10 is composed of a cylindrical body portion 12 and a conical tip taper-shaped portion 11 that is substantially equilateral triangular in side view at the lower end of the body portion 12. The length of the float 10 only needs to be longer than the height from the bottom surface of the existing pipe to the water level of the assumed flowing material because the tip of the tip taper-shaped portion 11 abuts against the bottom surface of the existing pipe. The diameter of the float 10 can measure smaller changes in specific gravity as it gets thinner, but if it is too thin, it may lack strength against highly viscous fillers. Therefore, it is appropriately determined considering the materials used.

[0026] For example, when the body portion 12 is a PVC pipe with a length of 250 mm, an outer diameter of 26 mm, and a thickness of 2 mm, and the tip taper-shaped portion 11 is made of stainless steel with a bottom outer diameter of 26 mm and a height of 50 mm, the water level position of the filler with a specific gravity of 1.9 - 2.1 is around slightly above the center of the body portion 12, and the water level position of the stagnant water with a specific gravity of 1.0 is around the upper part of the body portion 12. However, these sizes and materials are for illustration and are not limited to this. Needless to say, it is more preferable that the tip taper-shaped portion 11 is formed of a material heavier than the body portion 12 for the float 10 to be stable against the flowing material.

[0027] The tip taper-shaped portion 11 has a taper shape that narrows from the same diameter as the body portion 12 towards the tip on the lower end side of the float 10, and is a conical shape with a point at the tip. In this way, the tip of the float 10 preferably does not form a surface because it may receive an upward force from the filler as described above. When forming a surface, it is preferably as small as possible. As in the filling inspection device 100 of this embodiment, with the lower end of the float 10 being conical, the pressure that lifts upward from the filler that intrudes between the inner wall of the existing pipe and its lower end surface can be minimized. Also, the taper angle in the tip taper-shaped portion 11 is preferably small because the ratio of receiving an upward force from the filler decreases, and is preferably 90 degrees or less.

[0028] The body 12 has a cylindrical outer shape and can smoothly deflect a high-viscosity filler hitting it from the lateral direction. Since there are no irregularities in the vertical direction, the filler does not adhere. The interior of the body 12 is hollow and is configured to receive the sliding shaft 21 of the detector 20 so as to be movable in the vertical direction. Fig. (A) of this figure shows the state where the float 10 is at the lowest position relative to the detector 20, and Fig. (D) shows the state where the float 10 is at the highest position relative to the detector 20. The float 10 moves up and down between the state shown in Fig. (A) and the state shown in Fig. (D) according to the specific gravity of the surrounding fluid. Note that the body 12 is appropriately provided with a fixing portion (not shown) for fixing the detector 20 so that the detector 20 does not fall off.

[0029] The detector 20 includes a sliding shaft 21 that fits into the interior of the body 12 of the float 10 so as to be movable up and down, a magnet portion 22 fixed to the head of the body 12 so as to surround the sliding shaft 21, and a detection control portion 23 that detects the amount of movement of the float 10 up and down based on the positional relationship between the magnet portion 22 and the sliding shaft 21. The sliding shaft 21 has a reed switch (not shown) that turns on a switch due to the proximity of a magnetic field. The reed switch is disposed at a predetermined position in the vertical direction of the sliding shaft 21 and is turned on when the magnet portion 22 fixed to the float 10 moves upward from below and comes close.

[0030] As shown in Fig. 2, the filling inspection device 100 in this embodiment has a first reed switch 24 and a second reed switch 25, and detects the amount of movement in two stages. When a fluid with a specific gravity of 1.0 such as stagnant water reaches the water level shown in the figure (the state of Fig. (A)), the filling inspection device 100 abuts the tip tapered portion 11 against the bottom of the existing pipe, and the float 10 is in a state where it is not floating at all. Since the magnet portion 22 is located below the first reed switch 24, the first reed switch 24 and the second reed switch 25 remain off. Note that the specific gravity of the filler in this figure is 2.1, and the float 10 is configured to be in the state where it has moved up to the highest position relative to the detector 20 when the fluid with a specific gravity of 2.1 fills the surroundings.

[0031] When there is a fluid material with a specific gravity of 1.9, for example, which seems to be diluted by the stagnant water, up to the water level shown in the figure (the state in Fig. (B) of this figure), the filling inspection device 100 moves away from the bottom of the existing pipe and the float 10 is slightly floating. Since the magnet part 22 is at the position of the first reed switch 24, the first reed switch 24 is turned on. Further, when there is a filling material (fluid material) with a specific gravity of 2.1 up to the water level shown in the figure (the state in Fig. (C) of this figure), the filling inspection device 100 is in a state where the float 10 floats further upward. Since the magnet part 22 is at the position of the second reed switch 25 which is located above the first reed switch 24, the first reed switch 24 is turned off and the second reed switch 25 is turned on.

[0032] In this embodiment, detection is performed in two steps. However, it may be configured to perform detection in one step or even more steps. Just arrange the required number of reed switches corresponding to the number of steps in the axial direction of the sliding shaft 21. In this way, by the detector 20 detecting the movement amount of the float 10 in multiple steps, the process of being replaced from stagnant water to the filling material can be monitored. Also, it can be confirmed for filling materials with various specific gravities. In Fig. 2, the body part 12 is shown semi-transparent so that the sliding shaft 21 fitted inside can be seen, but the body part 12 may be transparent or not transparent.

[0033] The detection control unit 23 is electrically connected to the first reed switch 24 and the second reed switch 25, and the first lighting unit 31 and the second lighting unit 32 of the lighting unit 30 provided on the side surface. When the first reed switch 24 is turned on, the first lighting unit 31 lights up, and when the second reed switch 25 is turned on, the second lighting unit 32 lights up. For example, the first reed switch 24 emits red light, and the second reed switch 25 emits green light. When the lighting unit 30 lights up in red, it can be confirmed that a flowing substance close to a predetermined specific gravity (2.1 in the example of this figure) is reaching the surroundings, and when it lights up in green, the filling material with a predetermined specific gravity has reached the surroundings of the float 10. Note that the detection control unit 23 may transmit the electrical signals detected by the first reed switch 24 and the second reed switch 25 to an external device via wired or wireless communication. According to this, not only the visual notification by the lighting unit 30 but also the external device can comprehensively monitor the states of a plurality of filling inspection devices 100.

[0034] The above-described filling inspection device 100 includes a float 10 that moves up and down according to the specific gravity of a flowing substance in an inspection hole provided at the bottom of a tubular body, a detector 20 that detects the amount of movement of the float 10, and a lighting unit 30 that visually notifies a predetermined amount of movement of the float 10. The float 10 has a cylindrical body portion 12 and a tip tapered portion 11 having a conical shape that narrows toward the tip at a portion in contact with the flowing substance, that is, a tapered shape that narrows toward the lower end side of the float 10 in part. Thereby, in order to accurately detect that the stagnant water (specific gravity: 1.0) is replaced by the filling material (specific gravity: 1.2 or more), the filling inspection device 100 can accurately detect a slight specific gravity difference between the stagnant water and the filling material in the inspection hole.

[0035] Further, it is preferable that the float 10 does not have a shape in which the filling material adheres or covers from above, such as a shape that widens toward the lower end side of the float 10 (reverse taper shape) or a shape that projects vertically (parallel to the water level) from the body portion 12. If such a shape is present in the portion of the float that contacts the flowing material, during the injection of the filling material, the filling material having a specific gravity greater than that of the stagnant water may cover the shaped portion, and then the float will not float with appropriate buoyancy. Therefore, by not having such a shape, it is possible to avoid the filling material covering the shaped portion and the float 10 not floating with the correct buoyancy.

[0036] Figure 3 shows an outline of a construction method when applying a filling material between an existing pipe and a tubular body using the filling inspection device 100. This figure (A) is a view looking at the bottom from a cross-section parallel to the bottom of the existing pipe of the existing pipe and the tubular body (profile) arranged inside it. This figure (B) represents the A-A' cross-section shown in this figure (A), and this figure (C) represents the B-B' cross-section shown in this figure (A). In both cases, the ceiling portions of the existing pipe and the tubular body are omitted.

[0037] A gap is provided between the existing pipe and the tubular body for filling a filling material as a backfill material. Note that a known method is used for the method of providing the tubular body inside the existing pipe. After laying the tubular body, injection holes for inserting the filling material injection hose from the inside are opened on both side surfaces of the tubular body. Note that the injection holes are not limited to the side surfaces of the tubular body and may be the bottom surface or the top surface of the tubular body. Further, inspection holes for attaching the filling inspection device 100 are opened on the bottom surface of the tubular body. In this figure, a plurality (two) of inspection holes are provided along the center line of the bottom of the tubular body. This is because, since the injection holes are provided on both side surfaces, it is considered that the filling material reaches the vicinity of the center line last in the radial direction. Therefore, the position where the inspection holes are provided is appropriately selected according to the method of construction and the shape of the existing pipe to be targeted.

[0038] For example, if the injection holes are provided only on one side surface, it is preferable to provide the inspection holes near the opposite side surface rather than at the center. Also, the existing pipe in this figure has a non-circular shape (rectangular), and its bottom is flat, but the filling inspection device 100 is not limited to this, and the existing pipe may be circular. In this case, even if the injection holes are provided on both side surfaces, it is preferable to provide the inspection holes at a position where the predetermined water level of the filling material can be measured at a position away from the bottommost part rather than at the center of the bottommost part. That is, the position where the inspection holes are provided is appropriately selected in consideration of positions where the filling material is difficult to reach and positions where it is desired to confirm that the filling material has been filled to a predetermined height, based on the position where the injection holes are provided and the shape of the existing pipe. Note that the size of the inspection hole should be such that the filling inspection device 100 can fit sufficiently with the tip tapered shape portion 11 of the float 10 facing down and the detector 20 facing up, or a size that conforms to the fixture 200 described later.

[0039] After the inspection holes are opened, the filling inspection device 100 is attached to each of the inspection holes. The filling inspection device 100 is preferably attached using a fixture 200 that holds the filling inspection device 100 inside and fits into the inspection hole, as shown in FIGS. 4 and 5 for example. The fixture 200 is a cylinder that fits into the inspection hole, holds the detector 20 portion inside, and the float 10 is movable in the vertical direction.

[0040] Next, a filling material injection hose is inserted into the injection hole, and the filling material is injected into the gap. Then, as shown by the arrow in FIG. 3, the filling material flows on the bottom surface of the existing pipe in the axial direction and the central direction due to the injection pressure. FIGS. 4 and 5 are enlarged representations of the filling material flowing into the filling inspection device 100. FIG. 4 shows a state where the filling material has just flowed to the filling inspection device 100, and residual water remains below the set liquid level height of the filling material assumed by the filling inspection device 100 inside the fixture 200. In such a state, in the filling inspection device 100, the float 10 does not float, the lighting portion 30 does not light, indicating that the filling material with a predetermined specific gravity has not sufficiently reached this filling inspection device 100.

[0041] On the other hand, FIG. 5 shows a state where the filling material has flowed to the position of the filling inspection device 100 and the filling material has reached the set liquid level height of the filling material assumed by the filling inspection device 100 inside the fixture 200. In such a state, in the filling inspection device 100, the float 10 floats due to a predetermined specific gravity, the lighting unit 30 lights up, and it can be said that the filling material with a predetermined specific gravity has sufficiently reached this filling inspection device 100. In this way, when applying the filling material to the gap between the existing pipe and the tubular body using the filling inspection device 100, the filling inspection device 100 attached to the inspection hole during the injection of the filling material detects the specific gravity of the flowing material. Although the stagnant water remaining inside the fixture 200 shown in FIG. 4 is shown in FIG. 5 as being lifted above the set liquid level height by the filling material, an overflow port (not shown) may be provided to drain the stagnant water near the set liquid level height outside the fixture 200, or the stagnant water above the set liquid level height inside the fixture 200 may be sucked up by a pump (not shown).

[0042] The filling material reaches the filling inspection devices 100 in order from the filling inspection device 100 attached to the inspection hole closer to the normal injection hole. For the filling inspection device 100 attached to the inspection hole where the filling material with a predetermined specific gravity has reached, the lighting unit 30 (especially the second lighting unit 32) lights up. When a plurality of filling inspection devices 100 are arranged in the construction area, the lighting unit 30 lights up in order from the filling inspection device 100 closer to the injection hole, and when the lighting unit 30 of the filling inspection device 100 arranged at the position farthest from the injection hole lights up, it is confirmed that the entire construction area has been filled with the filling material. In this way, when the filling inspection device 100 detects a flowing material with a predetermined specific gravity, it is confirmed that the gap between the existing pipe and the tubular body provided inside it where the inspection hole to which the filling inspection device 100 that has detected the flowing material with a predetermined specific gravity is attached is located has been filled with the filling material.

[0043] According to the above-described filling material injection method, by the filling inspection device 100 attached to a plurality of inspection holes provided at the bottom of the tubular body at the position where filling needs to be confirmed detecting the predetermined specific gravity of the flowing material, it is possible to confirm throughout the entire construction area that the gap between the existing pipe and the tubular body provided inside it has been appropriately filled with the filling material during construction.

[0044] <Second Embodiment> Hereinafter, with reference to FIG. 6, the filling inspection device 100A in this embodiment will be described. To avoid redundant description, the same components as above are denoted by the same reference numerals and the description is omitted as much as possible, and the description will focus on the different parts. The filling inspection device 100A includes a float 10A that moves up and down according to the specific gravity of the flowing material in the inspection hole provided at the bottom of the tubular body, a detector 20A that detects the amount of movement of the float 10A, and a lighting unit 30 that visually notifies a predetermined amount of movement of the float 10A.

[0045] The float 10A is composed of a body portion 12A having a quadrangular prism outer shape and a tip taper shape portion 11A of a quadrangular pyramid that is substantially equilateral triangular in side view at the lower end of the body portion 12A. The tip taper shape portion 11A has a taper shape that is narrowed from the same quadrilateral as the bottom surface of the body portion 12A toward the tip on the lower end side of the float 10A, and is a quadrangular pyramid shape with a point at the tip. Like the filling inspection device 100A of this embodiment, when the lower end of the float 10A is quadrangular pyramid-shaped, the pressure that is lifted upward from the filling material that intrudes between the inner wall of the existing pipe can be minimized. Since there are no irregularities in the vertical direction on the body portion 12A, the filling material does not adhere or the like. The inside of the body portion 12A is hollow and is adapted to receive the sliding shaft 21 of the detector 20A so as to be movable in the vertical direction.

[0046] The float 10A has, at the portion in contact with the flowing material, a body portion 12A of a quadrangular prism and a tip taper shape portion 11A having a quadrangular pyramid shape that is narrowed toward the tip, that is, a taper shape that is narrowed toward the lower end side of the float 10A in part. Thereby, in order to accurately detect that the stagnant water is replaced by the filling material, the filling inspection device 100A can accurately detect a slight difference in specific gravity between the stagnant water and the filling material in the inspection hole. Further, the float 10A does not have a shape in which the filling material adheres or covers from above, such as a shape that widens toward the lower end side of the float 10A (reverse taper shape) or a shape that projects perpendicularly (parallel to the water level) from the body portion 12A. Thereby, it is possible to avoid the situation where the filling material covers such a shaped portion and the float 10A does not float with the correct buoyancy.

[0047] The detector 20A includes a sliding shaft 21 that is fitted inside the body 12A so as to be vertically movable, a magnet portion 22A that is fixed to the head of the body 12A so as to surround the sliding shaft 21, and a detection control portion 23 that detects the amount of movement of the float 10A up and down based on the positional relationship between the magnet portion 22A and the sliding shaft 21. The magnet portion 22A has a rectangular outer shape in accordance with the fact that the body 12A is a quadrangular prism.

[0048] <Third Embodiment> Hereinafter, with reference to FIG. 7, the filling inspection apparatus 100B in this embodiment will be described. In order to avoid redundant description, the same reference numerals are given to the same components as above and the description is omitted as much as possible, and the description will be centered on the different parts. The filling inspection apparatus 100B includes a float 10B that moves up and down according to the specific gravity of the flowing material in the inspection hole provided at the bottom of the tubular body, a detector 20 that detects the amount of movement of the float 10B, and a lighting unit 30 that visually notifies a predetermined amount of movement of the float 10B.

[0049] The float 10B is composed of a body 12B having a conical shape. This body 12B has a tapered shape that is narrowed from the same diameter as the magnet portion 22 toward the tip on the lower end side of the float 10B and is a conical shape with a point at the tip. By having the entire float 10B be conical as in the filling inspection apparatus 100B of this embodiment, the pressure for lifting upward from the filling material that intrudes between the inner wall of the existing pipe can be minimized. Since there are no irregularities in the vertical direction on the body 12B, the filling material does not adhere or the like. The inside of the body 12B is hollow and is adapted to receive the sliding shaft 21 of the detector 20 so as to be vertically movable.

[0050] The float 10B has a body portion 12B with a conical shape that narrows toward the tip at the portion in contact with the flowing material, that is, has a tapered shape that narrows toward the lower end side of the float 10B. Thereby, in order to accurately detect that the stagnant water is replaced by the filler, the filling inspection device 100B can accurately detect the slight difference in specific gravity between the stagnant water and the filler in the inspection hole. Further, the float 10B does not have a shape in which the filler adheres or covers from above, such as a shape that widens toward the lower end side of the float 10B (reverse tapered shape) or a shape that projects vertically (parallel to the water level) from the body portion 12B. Thereby, it is possible to avoid the situation where the filler covers such a shaped portion and the float 10B does not float with the correct buoyancy.

[0051] Note that the present invention is not limited to the illustrated embodiments, and can be implemented with configurations that do not deviate from the contents described in each item of the claims. That is, although the present invention is mainly illustrated and described with respect to specific embodiments, without departing from the scope of the technical idea and purpose of the present invention, those skilled in the art can make various modifications to the above-described embodiments in terms of quantity and other detailed configurations.

Explanation of Signs

[0052] 100 Filling inspection device 10 Float 11 Tip tapered shape portion 12 Body portion 20 Detector 21 Sliding shaft 22 Magnet portion 23 Detection control unit 30 Lighting unit 31 First lighting unit 32 Second lighting unit 200 Fixture

Claims

1. A filling inspection device for inspecting the filling status of a filling material filled between an existing pipe and a tubular body provided inside the existing pipe, comprising: a float that moves up and down according to the specific gravity of a flowing material in an inspection hole provided at the bottom of the tubular body; a detector that detects the amount of movement of the float; The filling inspection device is provided with: The float has a tapered shape that is narrowed at least in part toward the lower end side of the float in a portion that contacts the flowing material. Filling inspection device.

2. The filling inspection device according to claim 1, wherein the float does not have a shape that widens toward the lower end side of the float.

3. The filling inspection device according to claim 1 or 2, wherein the outer shape of the side surface of the float is cylindrical, and the lower end of the float is conical.

4. The filling inspection device according to any one of claims 1 to 3, wherein the detector detects the amount of movement of the float in multiple stages.

5. When applying a filling material between an existing pipe and a tubular body provided inside the existing pipe, a step of providing a plurality of inspection holes at the bottom of the tubular body; a step of attaching the filling inspection device according to any one of claims 1 to 4 to the inspection holes; a step of injecting a filling material into the gap between the existing pipe and the tubular body; a step of detecting the specific gravity of the flowing material by the filling inspection device attached to the inspection hole while injecting the filling material; when the filling inspection device detects a flowing material with a predetermined specific gravity, a step of confirming that the gap between the existing pipe and the tubular body where the inspection hole to which the filling inspection device that detected the flowing material with the predetermined specific gravity is attached is filled with the filling material; A filling material injection method including the above steps.

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