Water stop jig and water stop method

Abstract

To provide a water stop jig capable of improving water stop performance.SOLUTION: A water stop jig 1 is used to stop water leakage from an opening defect part 92 formed in a pipe 9, and comprises a shaft part 2 having a head part 22 at its tip and inserted into the opening defect part 92, a sleeve 3 inserted into the opening defect part 92 and provided around the shaft part 2, and a screwing part 4 screwed to the shaft part 2. As the screwing part 4 is screwed to the shaft part 2, the sleeve 3 is deformed so as to expand in a radially outward direction of the sleeve 3, and comes into contact with an inner surface 9a of the pipe 9. An inner peripheral surface of the sleeve 3 has a cutout part 35 cut out in the radially outward direction of the sleeve 3.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a water stop device and a water stop method for stopping water leakage from a target structure such as a pipe or a water tank. [Background technology]

[0002] Conventionally, a method of driving a wooden plug into the leaking part has been known to stop water leakage from steel pipes, etc. Patent Document 1 also discloses a leak repair seal made of a water-swelling plastic material as the main material that contacts the leaking part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-88178 [Patent Document 2] Japanese Patent Application Publication No. 2023-84676 Summary of the Invention [Problem to be solved by the invention]

[0004] When a leak occurs from a pipe under internal water pressure, repairs are usually made after the water supply has been stopped, but there are cases where the water supply cannot be completely stopped. In such cases, water stoppage measures must be taken while the pipe is still leaking before repair work can be carried out. However, the conventional method of driving wooden plugs requires that the pipe be thick enough and strong enough to not deform due to the impact of driving the plugs in. Therefore, it is difficult to apply this method to pipes that have suffered from advanced corrosion and thinning. Furthermore, there is a risk that the water will not be stopped sufficiently unless the opening due to the defect is small and has a nearly circular shape.

[0005] With the technology disclosed in Patent Document 1, even if repair work is carried out when there is a leak, it may not be possible to attach a leak repair seal to the pipe, and water may not be sufficiently stopped.

[0006] Therefore, Patent Document 2 has also been proposed as a technology for stopping water leakage from pipes, etc. The water stopping jig in Patent Document 2 comprises a shaft portion to be inserted into the opening defect, a sleeve that is inserted into the opening defect and provided around the shaft portion, and a threaded portion that is threaded onto the shaft portion, and the sleeve is deformed so as to expand in the radially outward direction of the sleeve by threading the threaded portion onto the shaft portion, and comes into contact with the inner surface of the target structure.

[0007] However, in the technology disclosed in Patent Document 2, the thickness of the sleeve is constant. When the threaded portion is threaded onto the shaft, it is difficult to control the position at which the sleeve expands radially outward, which may result in the compressed and deformed sleeve not coming into contact with the inner surface of the target structure. For this reason, a technology to improve watertightness is needed.

[0008] The present invention has been devised in view of the above circumstances, and its object is to provide a water-stopping jig and a water-stopping method that can improve water-stopping performance. [Means for solving the problem]

[0009] The water stopping device of the present invention is a water stopping jig for stopping water leakage from an opening defect formed in a target structure such as a pipe or a water tank, and comprises a shaft portion having a head at the tip and inserted into the opening defect, a sleeve inserted into the opening defect and arranged around the shaft portion, and a threaded portion screwed onto the shaft portion, wherein the sleeve is deformed so as to expand in an outward direction of the diameter of the sleeve by threading the threaded portion onto the shaft portion, and comes into contact with the inner surface of the target structure, and the inner surface of the sleeve has a notch cut out in an outward direction of the diameter of the sleeve.

[0010] The water stopping method of the present invention is a water stopping method for stopping water leakage from an opening defect formed in a target structure such as a pipe or a water tank using a water stopping tool, and is characterized by comprising: an insertion process for inserting the shank of the water stopping tool and the sleeve, the shank having a head at the tip, a sleeve provided around the shank and having a notch cut out in the outward direction of the diameter of the sleeve on the inner surface, and a threaded portion that screws onto the shank; and a screwing process for screwing the threaded portion onto the shank, thereby deforming the sleeve so that it expands in the outward direction of the diameter of the sleeve and contacting the inner surface of the target structure. [Effects of the Invention]

[0011] According to the present invention, it is possible to improve the water stopping property. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1(a) is a cross-sectional view showing an example of a water stopping structure in the first embodiment, and FIG. 1(b) is a view of the example of the water stopping structure in the first embodiment as seen from the inner surface side of a pipe. [Figure 2] Figure 2(a) is a diagram showing an example of a water-stopping jig before the sleeve in the first embodiment is deformed, and Figure 2(b) is a diagram showing an example of a water-stopping jig after the sleeve in the first embodiment is deformed. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an example of a water stop jig and a water stop method according to an embodiment of the present invention will be described with reference to the drawings.

[0014] <First embodiment: Water stopping jig 1> As shown in Figures 1(a) and 1(b), a water stop structure 100 uses a water stop jig 1 to stop water leakage from an opening defect 92 formed in a target structure. The target structure is, for example, a steel pipe 9 such as a water pipe. The target structure may also be a water tank such as a water storage tank. The target structure is, for example, made of steel, but may also be made of cast iron or resin. A side wall 91 of the pipe 9 has an opening defect 92 formed by an opening and defect due to corrosion or the like. The pipe 9 is formed, for example, with a circular cross section. The water stop structure 100 includes the water stop jig 1.

[0015] The water stop jig 1 includes a shaft portion 2, a sleeve 3, and a threaded portion 4. The water stop jig 1 may further include a washer portion 5 as required.

[0016] <Shaft 2> The shaft 2 is formed of, for example, a bolt. A threaded portion 28 is formed on the outer circumferential surface of the shaft 2, into which the threaded portion 4 can be threaded. The shaft 2 has a head 22 at its tip. The diameter of the shaft 2 is, for example, about 12 mm, but may also be about 20 mm, 30 mm, or 50 mm.

[0017] The head portion 22 is disposed on the inner surface 9a side of the pipe 9. The head portion 22 is formed to have a diameter larger than that of the shaft portion 2.

[0018] <Sleeve 3> As shown in Fig. 2(a), the sleeve 3 is a cylindrical member provided around the shaft portion 2. If a gap is formed between the sleeve 3 and the shaft portion 2, leakage from this gap can be prevented by wrapping, for example, sealing tape around the shaft portion 2. The sleeve 3 is made of a resin material such as chloroprene rubber, EPDM (ethylene propylene diene rubber), vinyl chloride, polyethylene, silicone, urethane, acrylic, polysulfide, epoxy, or polyester.

[0019] The sleeve 3 is provided between the head 22 of the shank 2 and the threaded portion 4. As shown in FIG. 2(b), the sleeve 3 is compressively deformed by threading the threaded portion 4 onto the shank 2, and is brought into contact with the inner surface 9a of the pipe 9. The deformed sleeve 3 is formed by expanding into a substantially circular shape centered on the shank 2. In particular, the inner peripheral surface of the sleeve 3 has a notch 35 cut out in the radially outward direction of the sleeve 3. As a result, by threading the threaded portion 4 onto the shank 2, the notch 35 is crushed and the outer portion of the notch 35 expands in the radially outward direction of the sleeve 3.

[0020] When the threaded portion 4 of the sleeve 3 is screwed onto the shaft portion 2 in the opposite direction to the direction in which it is fastened, the compressed and deformed sleeve 3 can be restored to its original shape. Therefore, if an installation fails, it can be redone.

[0021] The notch 35 is cut out, for example, in an arc-shaped cross section, which can suppress stress concentration when the sleeve 3 is compressively deformed. Note that in the present invention, the notch 35 may be cut out in a rectangular or triangular cross section.

[0022] The sleeve 3 has an expanded diameter portion 34 formed at an end in the extension direction of the sleeve 3. The expanded diameter portion 34 comes into contact with the outer surface 9b of the pipe 9. The expanded diameter portion 34 is disposed so as to cover the opening defect portion 92.

[0023] <Threaded part 4> The threaded portion 4 is a nut that is threaded onto the shaft portion 2. The threaded portion 4 is disposed on the outer surface 9b side of the pipe 9.

[0024] <Washer part 5> The washer portion 5 is disposed on the inner surface 9a side of the pipe 9 and is in contact with the sleeve 3. The washer portion 5 has a flat washer 51, a waterproof rubber 52, and a washer 53 between the sleeve 3 and the head 22 of the shaft portion 2.

[0025] The flat washer 51 prevents loosening of the shank 2 and the threaded portion 4, and prevents them from falling off when they become loose. The waterproof rubber 52 is made of rubber and prevents water from entering the gap between the sleeve 3 and the shank 2. The washer 53 comes into contact with the head 22 of the shank 2, and receives the reaction force of the sleeve 3, which is compressed when the threaded portion 4 is threaded onto the shank 2.

[0026] The outer diameter of the washer 53 is the same as the outer diameter of the sleeve 3. This allows the washer 53 to uniformly press the end face in the extension direction of the sleeve 3 when the threaded portion 4 is threaded onto the shaft portion 2. This makes it easier to compress and deform the sleeve 3.

[0027] <Steel plate 7> The steel plate 7 has a through hole formed therein, through which the shaft portion 2 passes. The steel plate 7 is arranged on the outer surface 9b side of the pipe 9. The steel plate 7 is arranged between the enlarged diameter portion 34 and the threaded portion 4. The steel plate 7 is arranged so as to cover the opening defect portion 92. When the threaded portion 4 is threaded onto the shaft portion 2, the steel plate 7 can press the enlarged diameter portion 34 against the outer surface 9b of the pipe 9. Since the pressed enlarged diameter portion 34 contacts the outer surface 9b of the pipe 9, water leakage from between the enlarged diameter portion 34 and the outer surface 9b can be suppressed.

[0028] (First embodiment: an example of a water-stopping method) Next, an example of a water stopping method according to the present embodiment will be described. The water stopping method uses the water stopping jig 1 to stop water leakage from an opening defect 92 formed in a pipe 9 as a target structure. The water stopping method includes an insertion process and a screwing process.

[0029] In the insertion process, first, as shown in FIG. 2(a), the shank 2 and sleeve 3 of the waterstop jig 1, which has a shank 2, a sleeve 3, and a threaded portion 4, are inserted into the opening defect 92 of the pipe 9. In the insertion process, the sleeve 3 to which the threaded portion 4 is fixed is inserted into the opening defect 92. A washer portion 5 is placed on the shank 2 in advance. If necessary, a steel plate 7 is placed in the insertion process.

[0030] Next, in the screwing step, as shown in FIG. 2(b), the screwing portion 4 is screwed onto the shank 2 using an impact wrench (not shown) or the like. In the screwing step, by screwing the screwing portion 4 onto the shank 2, the sleeve 3 is compressively deformed so as to expand in the radially outward direction of the sleeve 3, and is brought into contact with the inner surface 9a of the pipe 9. This allows the deformed sleeve 3 to cover the opening defect portion 92 from the inner surface 9a of the pipe 9. This improves watertightness.

[0031] In the screwing process, the threaded portion 4 is threaded onto the shank 2, thereby compressively deforming the sleeve 3. The deformed sleeve 3 is formed into a substantially circular shape centered on the shank 2. The inner peripheral surface of the sleeve 3 has a notch 35 cut out in the radially outward direction of the sleeve 3. As a result, when the threaded portion 4 is threaded onto the shank 2, the outer portion of the notch 35 expands in the radially outward direction of the sleeve 3.

[0032] By screwing the threaded portion 4 into the shaft portion 2, the steel plate 7 presses the enlarged diameter portion 34 against the outer surface 9b. Therefore, the pressed enlarged diameter portion 34 contacts the outer surface 9b of the pipe 9, thereby suppressing water leakage from between the enlarged diameter portion 34 and the outer surface 9b, further improving the watertightness.

[0033] This completes the waterproofing method of this embodiment. Next, the effects of this embodiment will be described.

[0034] According to this embodiment, the inner circumferential surface of the sleeve 3 has a notch 35 cut out in the radially outward direction of the sleeve 3. As a result, when the threaded portion 4 is threadedly engaged with the shank 2, the notch 35 is crushed, and the outer portion of the notch 35 can be expanded in the radially outward direction of the sleeve 3. Because the position at which the sleeve 3 expands in the radially outward direction when the threaded portion 4 is threadedly engaged with the shank 2 can be controlled, the compressed and deformed sleeve 3 can easily come into contact with the inner surface 9a of the pipe 9. As a result, the watertightness can be improved.

[0035] According to this embodiment, the cutout portion 35 is cut out to have an arc-shaped cross section. This makes it possible to suppress stress concentration when the sleeve 3 is compressively deformed. As a result, the life of the sleeve 3 can be extended.

[0036] According to this embodiment, the sleeve 3 is provided between the head 22 and the threaded portion 4. This means that the threaded portion 4 is not embedded in the sleeve 3. This makes it easier to manufacture the waterstop jig 1.

[0037] Furthermore, according to this embodiment, the sleeve 3 is provided between the head 22 and the threaded portion 4. This allows the compressively deformed sleeve 3 to return to its original shape when the threaded portion 4 is threaded onto the shank 2 in the direction opposite to the direction in which it is fastened. This allows redoing if the installation fails.

[0038] Although an embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. This embodiment and its modifications are included within the scope and spirit of the invention, and are also included in the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0039] 100:Waterproof structure 1: Water stop jig 2: Shaft 22:Head 28: Threaded part 3: Sleeve 34: Expanded diameter part 35: Notch 4: Threaded joint 5: Washer part 51: Flat washer 52:Waterproof rubber 53: Washer 7: Steel plate 9: Piping 9a: Inner surface 9b: External surface 91: Side wall 92: Opening defect

Claims

1. A water stop jig for stopping water leakage from an opening defect formed in a target structure such as a pipe or a water tank, A shaft portion having a head at its tip and inserted into the opening defect portion; A sleeve inserted into the opening defect and disposed around the shaft portion; a threaded portion that is threadedly engaged with the shaft portion, the sleeve is deformed so as to expand radially outward by threading the threaded portion onto the shaft portion, and is brought into contact with the inner surface of the target structure; The inner peripheral surface of the sleeve has a notch cut out in the radially outward direction of the sleeve. A water stop jig characterized by the above.

2. The cutout portion is cut out in an arc shape.

2. The waterproof jig according to claim 1,

3. The sleeve is provided between the head and the threaded portion.

2. The waterproof jig according to claim 1,

4. A water stopping method for stopping water leakage from an opening defect formed in a target structure such as a pipe or a water tank using a water stopping jig, an insertion process of inserting the shank of the waterstop jig and the sleeve into the opening defect, the shank having a head at its tip, the sleeve being provided around the shank and having a notch cut out in the radially outward direction of the sleeve on the inner circumferential surface thereof, and a threaded portion threadedly engaged with the shank; a screwing step of screwing the threaded portion onto the shaft portion, thereby deforming the sleeve so as to expand in an outward radial direction of the sleeve and bringing the sleeve into contact with the inner surface of the target structure. A water-stopping method characterized by the following.

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