Inspection method for waterproof structure, manufacturing method for waterproof body for joining, and manufacturing method for joint body

Abstract

To provide an inspection method for a waterproof structure and a manufacturing method for a joint body that can accurately inspect joint defects.SOLUTION: There is provided an inspection method that inspects a joint part 25 between a structure 27 and a waterproof body 21 using an inspection device 43. The waterproof body 21 includes a tubular portion 23 formed of a waterproof sheet 31, and an end portion 24 of the tubular portion 23 is joined to an outer circumferential surface of the structure 27 to constitute the joint part 25. The inspection device 43 comprises a first electrode 45, a second electrode 47, a power supply unit for applying a voltage to the first electrode 45, and a detector for detecting a current between the first electrode 45 and the second electrode 47. The method includes: an installation step of making the joint part 25 of the waterproof body 21 face downward; an injection step of storing a conductive liquid 51 between the structure 27 and the tubular portion 23; an insertion step of inserting the first electrode 45 into the conductive liquid 51; and an application step of applying the voltage to the first electrode 45. After these steps, the method executes an inspection step of bringing the second electrode 47 close from outside the joint part 25, and detecting whether or not a current flows between the first electrode 45 and the second electrode 47 with the detector.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a method for inspecting a water-shielding structure, a method for manufacturing a water-shielding body for joining, and a method for manufacturing a joined body. [Background technology]

[0002] A communicating pipe unit that can simplify and shorten the time required to join the communicating pipe unit to a waterproof sheet at a construction site, as well as a waterproof structure and waterproof construction method using the communicating pipe unit have been proposed (see Patent Document 1).

[0003] In the technology of Patent Document 1, the communicating pipe unit is composed of a collection and drainage pipe (corresponding to a communicating pipe), a manhole with a through hole for passing the collection and drainage pipe through, a joint that joins the collection and drainage pipe to the manhole, and a manhole waterproof sheet joined so as to cover the inner surface of the manhole (including the collection and drainage pipe and the joint). The manhole waterproof sheet is composed of a lower waterproof sheet, an upper waterproof sheet, and a cover sheet laminated together.

[0004] The cover sheet is arranged to cover part of the outer periphery of the collection pipe (the base part of the collection pipe extending from the first water barrier), the joint, the extrusion fusion part, and the extrusion fusion part, and one end of the cover sheet is fixed to the collection pipe by joining to the outer surface of the collection pipe with the extrusion fusion part, a stainless steel band, and a sealant. In addition, the other end of the cover sheet is joined to the surface of the upper layer water shielding sheet outside the extrusion fusion part by the extrusion fusion part.

[0005] During the manufacturing process of the communicating pipe unit, it is preferable to inspect the watertightness (water-blocking properties) of the joints of the communicating pipe unit. An example of a watertight inspection is given below. Before joining the collection and drainage pipe and the first water barrier, an electrode (such as an electric wire) is placed on the surface of the collection and drainage pipe. After joining the collection and drainage pipe and the first water barrier, a high voltage is applied to the surface of the joint (for example, by brushing the surface of the joint with a brush to which a high voltage is applied). When electricity is applied to the electrode inside the joint, a spark occurs and the location is detected as a defect (pinhole) in the joint, and if a defect is found, it is determined that there is a problem with the watertightness. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2022-128415 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the technology of Patent Document 1 involves embedding an inspection piano wire inside the buildup and detecting defects between this piano wire and the outside by passing electricity through it, and does not directly detect defects that penetrate the joint (joint 34 in Patent Document 1) and the extrusion fusion part to the outer surface of the collection and drainage pipe (extrusion fusion part 357 in Patent Document 1). In other words, the joint formed by the extrusion fusion part between one end of the cover sheet and the outer surface of the collection and drainage pipe is not subject to inspection. As a result, the following problems arise. (1) It is time-consuming to embed piano wire in the welded area. (2) Even if there is no defect in the joint, if the piano wire is installed in a poor position, it may be mistakenly detected as damaged. (3) Metal piano wire remains at the joint, which poses a risk of damaging the seat.

[0008] The present invention has been made in view of the above circumstances, and its object is to provide a method for inspecting a water-blocking structure and a method for manufacturing a joint that can inspect for joint defects with high accuracy. [Means for solving the problem]

[0009] Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments. The inspection method for a waterproof structure according to claim 1 of the present invention is a waterproof body 75 made of a waterproof sheet 31 covering a three-dimensional covering surface 73 that is at least a part of a structure 71, and is an inspection method for inspecting an edge joint 85 of the waterproof sheet 31 that forms the three-dimensional shape of the waterproof body 75 along the three-dimensional covering surface 73 using an inspection device 43, The inspection device 43 includes a first electrode 45, a second electrode 47, a power supply unit that applies a voltage to the first electrode 45, and a detector that detects a current flowing between the first electrode 45 and the second electrode 47. an installation step (A) of arranging a concave portion including the edge joint portion 85 in the three-dimensional shape portion of the water shielding body 75 so that an open side faces upward; a pouring step (B) of storing a conductive liquid 51 in the recessed portion so that the edge joining portion 85 is immersed; an insertion step (C) of inserting the first electrode 45 into the stored conductive liquid 51; an application step (D) of applying a voltage to the first electrode 45; Including, After carrying out the steps (A), (B), (C), and (D), An inspection step (E) is performed in which the second electrode 47 is brought close to the edge joint 85 at a predetermined distance from the outside thereof, and the detector detects whether or not a current flows between the first electrode 45 and the second electrode 47. It is characterized by:

[0010] In this method for inspecting a waterproof structure, the edge joint 85 of the waterproof body 75 that covers the three-dimensional coating surface 73 that is at least a part of the structure 71 can be inspected using the inspection device 43. The structure 71 has a three-dimensional structure and may be a square block, a tube, or a column. For example, in the case of a tube, the cross section perpendicular to the tube axis may be a polygon such as a circle, an ellipse, or a square. The structure 71 is formed from a resin material. The water shielding body 75 has a predetermined three-dimensional shape, such as a cylinder, square tube, cone, or pyramid, formed from the resin water shielding sheet 31. For example, if the structure 71 is a square block, the water shielding body 75 has protruding corners M and recessed corners V, and has a three-dimensional shape that covers these. Then, in order to form this three-dimensional shape with the water shielding sheet 31, the water shielding body 75 is formed by having edge joints. The water shielding body 75 has a concave portion formed including the edge joint, which makes it possible to cover the structure 71. Then, an inspection (watertightness inspection) of the watertightness (watertightness) of this edge joint is carried out. In a watertightness inspection, the water shielding body 75 is positioned so that the open side of the concave portion faces upward. The concave portion has an edge joint, and conductive liquid 51 is poured into this concave portion. The poured conductive liquid 51 is stored in the concave portion. As a result, the edge joint is immersed in the conductive liquid 51. A first electrode 45 is inserted into the recessed portion of the stored conductive liquid 51, which is open at the top, so that the first electrode 45 comes into contact with the conductive liquid 51. Next, a voltage is applied to the first electrode 45, and a second electrode 47 is brought close to the edge joint at a certain distance from the outside. A detector in the inspection device 43 detects whether a current has flowed between the first electrode 45 and the second electrode 47. That is, after the conductive liquid 51 is stored in the recessed portion at a predetermined pressure for a predetermined time, a spark test is performed by bringing the second electrode 47 close to the edge joint. The test is performed by checking whether or not a detector detects a spark caused by, for example, air discharge from the second electrode 47, which is not in contact with the edge joint. The air discharge also makes it possible to visually identify the approximate locations of pinholes, cracks, poor joints, etc. by the flash of light. When the detector detects a spark, the inspection device 43 emits an error sound to indicate an error, i.e., the presence of a defective part such as a pinhole in the edge joint. If the water shield 75 has multiple edge joints, this spark inspection is performed on each of them in turn. Edge joints where leakage due to defects such as pinholes is confirmed are either rewelded or discarded. Workpieces that are inspected and where leakage due to defects such as pinholes is not confirmed are completed as water shields for joints. In this method for inspecting a water-blocking structure, the edge joints that form the shape of the three-dimensional water-blocking body 75 can be inspected. Since the conductive liquid 51 is stored in the recessed portion including the edge joint, a predetermined water pressure can be applied to the edge joint that is the subject of the watertight inspection, making it possible to detect even minute pinholes, cracks, and poor joints without missing any. Furthermore, the time and effort required to embed piano wire in the build-up portion, which was previously required in the conventional method, is eliminated. Furthermore, since no piano wire is installed, even if there is no defect in the edge joint, there is no risk of it being mistakenly detected as damaged due to poor installation position of the piano wire. Furthermore, since no metal piano wire is left at the edge joint, there is no risk of the sheet being damaged over time.

[0011] A method for inspecting a waterproof structure according to claim 2 of the present invention is the method for inspecting a waterproof structure according to claim 1, A water pressure of 6.7 kPa or more is applied to the edge joint by the conductive liquid 51.

[0012] In this watertight structure inspection method, in the inspection process, a water pressure of 6.7 kPa or more is applied to the edge joints in the concave-shaped portion by means of conductive liquid 51. In the watertight inspection, the concave-shaped portion including the edge joints of water-shielding body 75 formed in a three-dimensional shape is placed with the open side facing upward, i.e., in the shape of a vessel. Conductive liquid 51 is poured into water-shielding body 75. At this time, the edge joints are submerged in the concave-shaped portion where conductive liquid 51 is stored, and the load of conductive liquid 51 acts on these edge joints. In the watertightness test, the water level in the stored state is preferably set to 67 cm or more. In other words, a water pressure of 6.7 kPa or more is applied by the conductive liquid 51 at the edge joint position. This allows the conductive liquid 51 to pass through tiny holes that water cannot pass through due to surface tension during a watertightness test. The conductive liquid 51 that passes through the tiny holes in the edge joint flows out (oozes out) to the outside of the edge joint, allowing for visual inspection and making it easier to detect by the second electrode 47.

[0013] A method for inspecting a waterproof structure according to claim 3 of the present invention is a method for inspecting a waterproof structure according to claim 1 or 2, comprising: The inspection device is characterized in that it is capable of applying a voltage of 300V or more.

[0014] In this watertight structure inspection method, the inspection device 43 can apply a voltage of 300 V or more. This makes it possible to detect with high sensitivity even leaks that are merely seepage from pinholes, cracks, or poorly joined areas. In this case, the inspection is performed by checking whether or not a detector detects sparks caused by air discharge. Air discharge also makes it possible to visually identify the approximate locations of pinholes, poorly joined areas, etc., by the flash of light.

[0015] The water-tight structure inspection method according to claim 4 of the present invention is an inspection method for inspecting a joint 25 at which a structure 27 and a water-tight body 21 are watertightly joined using an inspection device 43, The water-shielding body 21 includes a tubular portion 23 formed of a water-shielding sheet 31, and an end portion 24 on one end side of the tubular portion 23 is a joint portion 25 joined to the outer periphery of the structure 27 over the entire periphery, The inspection device 43 includes a first electrode 45, a second electrode 47, a power supply unit that applies a voltage to the first electrode 45, and a detector that detects a current flowing between the first electrode 45 and the second electrode 47. an installation step (A) of arranging the joint portion 25, which is one end side of the tubular portion 23 of the water shielding body 21, facing downward and the other end side of the tubular portion 23 of the water shielding body 21 facing upward; an injection step (B) of storing a conductive liquid 51 between the structure 27 and the cylindrical portion 23; an insertion step (C) of inserting the first electrode 45 into the stored conductive liquid 51; an application step (D) of applying a voltage to the first electrode 45; Including, After carrying out the steps (A), (B), (C), and (D), An inspection step (E) is performed in which the second electrode 47 is brought close to the joint 25 from the outside thereof by a certain distance, and the detector detects whether or not a current has flowed between the first electrode 45 and the second electrode 47. It is characterized by:

[0016] In this method for inspecting a water-impermeable structure, the joint 25 where the structure 27 and the water-impermeable body 21 are watertightly joined can be inspected using the inspection device 43. The structure 27 may be a pipe or a column. For example, in the case of a pipe, the cross section perpendicular to the pipe axis may be a circle, an ellipse, or a polygon. The structure 27 is made of a resin material. The water shielding body 21 has a tubular portion 23 formed of a waterproof sheet 31 made of resin. When the structure 27 is a cylindrical pipe having a circular cross section perpendicular to the pipe axis, the tubular portion 23 is a cylinder with an inner diameter equal to or larger than the outer diameter of the pipe. The water shielding body 21 has, for example, a rectangular waterproof sheet 31 as a flange portion 35 on the other end side of the tubular portion 23. The flange portion 35 is made of a resin material (such as a polyethylene resin) with a predetermined hardness, which enables the flange portion 35 and the tubular portion 23 to maintain their hat-shaped shape. The tubular portion 23 is manufactured watertightly as one unit with the flange portion 35, with the pipe axis 37 passing through the intersection of two diagonal lines of the flange portion 35 and in a direction perpendicular to the flange portion 35. In the water-shielding body 21, the inner hole 41 of the tubular portion 23 opens as an opening on the back surface opposite to the surface of the flange portion 35 from which the tubular portion 23 protrudes. In other words, in the water-shielding body 21, the structure 27 passed through the tubular portion 23 penetrates the flange portion 35. The end portion 24 of the tubular portion 23 opposite the flange portion 35 is one end, and the flange portion side is the other end. The structure 27 and the water shielding body 21 are joined together by inserting the structure 27 into an opening of the tubular portion 23 that opens at the back surface of the flange portion 35, for example, and protruding from one end side of the tubular portion 23. The end portion 24 on one end side of the tubular portion 23 is joined around the entire outer periphery of the structure 27. This joint becomes an annular joint portion 25. The joining is performed by, for example, resin welding in which a resin melting rod is thermally melted. As a result, the tubular portion 23 and the structure 27, which serve as base materials, are melted and joined to the melting rod. It is preferable that the tubular portion 23 and the structure 27, which serve as base materials, are made of the same material (for example, polyethylene-based resin, etc.), in order to make welding easier. The joined body 29 in which the structure 27 and the water-blocking body 21 are joined at the joint 25 in this manner is inspected (watertightness inspection) for watertightness (watertightness) of the joint 25 using an inspection device 43. In a watertightness inspection, the joint 25, which is one end side of the tubular portion 23 of the water shielding body 21, is oriented downward (vertically downward), and the other end side of the tubular portion 23 is oriented upward. In other words, the tube axis 37 of the tubular portion 23 is oriented vertically. A conductive liquid 51 is injected between the structure 27 and the tubular portion 23 from the opening of the tubular portion 23, which opens at the flange portion 35. The injected conductive liquid 51 is stored in an annular gap that has the joint 25 at the bottom and is interposed between the outer periphery of the structure 27 and the inner periphery of the cylindrical portion 23 . A first electrode 45 is inserted into the annular gap that opens at the flange portion 35 and contacts the stored conductive liquid 51. Next, a voltage is applied to the first electrode 45, and a second electrode 47 is brought close to the outside of the joint 25 by a certain distance. A detector of the inspection device 43 detects whether a current has flowed between the first electrode 45 and the second electrode 47. That is, after the conductive liquid 51 is stored in the annular gap at a predetermined pressure for a predetermined time, a spark test is performed by bringing the second electrode 47 close to the joint 25. The test is performed by checking whether or not a detector detects a spark caused by, for example, air discharge from the second electrode 47, which is not in contact with the joint 25. The air discharge also makes it possible to visually identify the approximate locations of pinholes, cracks, poor joints, etc. by the flash of light. When the detector detects a spark, the inspection device 43 emits an error sound to notify of the error, i.e., the presence of a defective part such as a pinhole in the joint 25. If the cylindrical part 23 is a multi-tube (tube-in-tube) tube, this spark inspection is performed on each cylindrical part 23 in each layer. The joint 25 where leakage is confirmed due to defects such as pinholes is either rewelded or discarded. The workpiece that is the inspected object where leakage is not confirmed due to defects such as pinholes becomes a joint 29, and the manufacturing of the product is completed. In this method for inspecting a water-blocking structure, the joint 25 between the outer peripheral surface of the structure 27 and the end 24 at one end side of the tubular portion 23 can be inspected. In addition, the annular gap joint 25 is positioned on the bottom side and the conductive liquid 51 is stored therein, so a predetermined water pressure can be applied to the joint 25 that is the target of the watertightness inspection. This makes it possible to detect even minute pinholes, cracks, and poor joints without missing any. Furthermore, the time and effort required to embed piano wire in the build-up portion, which was previously required in the conventional method, is eliminated. Furthermore, since no piano wire is installed, even if there is no defect in the joint 25, there is no risk of it being erroneously detected as damaged due to poor installation position of the piano wire. Furthermore, since no metal piano wire remains at the joint 25, there is no risk of the sheet being damaged over time.

[0017] A method for inspecting a waterproof structure according to claim 5 of the present invention is the method for inspecting a waterproof structure according to claim 4, The water shielding body 21 has a sheet joint formed by joining a plurality of water shielding sheets together, The method is characterized by having an inspection process (F) in which the second electrode 47 is brought close to the sheet joint by a certain distance from the outside, and the detector detects whether or not a current has flowed between the first electrode 45 and the second electrode 47.

[0018] In this method for inspecting a waterproof structure, the waterproof body 21 has a sheet joint formed by joining waterproof sheets together. The watertightness inspection may be conducted not only on the joint 25 between the structure 27 and the waterproof body 21, but also on the sheet joints between the multiple waterproof sheets that make up the waterproof body 21. The waterproof body 21 is formed by rolling up one waterproof sheet 31 and joining both end edges to form the tubular portion 23, but for example, multiple waterproof sheets 31 may be used and both ends of each waterproof sheet 31 may be joined to form a single tubular body. In this case, it is possible to also perform a watertightness inspection on the sheet joints that join the individual waterproof sheets 31.

[0019] A method for inspecting a waterproof structure according to claim 6 of the present invention is a method for inspecting a waterproof structure according to claim 4 or 5, A water pressure of 6.7 kPa or more is applied to the joint 25 between the structure 27 and the cylindrical portion 23 by the conductive liquid 51.

[0020] In this watertight structure inspection method, in the inspection process, a water pressure of 6.7 kPa or more is applied to joint 25 between structure 27 and tubular portion 23 by conductive liquid 51. In the watertight inspection, joint 25, which is one end side of tubular portion 23 of water-shielding body 21, is oriented downward, and the other end side of tubular portion 23 of water-shielding body 21 is oriented upward, with tube axis 37 of tubular portion 23 oriented vertically. Conductive liquid 51 is injected between structure 27 and tubular portion 23 from an opening on the other end side of tubular portion 23, which opens at flange portion 35. At this time, the load of conductive liquid 51 acts on joint 25, which is positioned at the lower end of the annular cavity in which conductive liquid 51 is stored. In the watertightness test, the total length of the cylindrical portion 23 in the direction along the tube axis 37 is set to 67 cm or more. In other words, a water pressure of 6.7 kPa or more is applied by the conductive liquid 51 to the annular gap side of the joint 25. This allows the conductive liquid 51 to pass through tiny holes that water cannot pass through due to surface tension during a watertightness test. The conductive liquid 51 that passes through the tiny holes in the joint 25 flows out (oozes out) to the outside of the joint 25, allowing for visual inspection and making it easier to detect by the second electrode 47.

[0021] A method for inspecting a waterproof structure according to claim 7 of the present invention is a method for inspecting a waterproof structure according to claim 4 or 5, The length of the cylindrical portion 23 in the direction perpendicular to the tube axis 37 of the cylindrical portion 23 is 1 to 2 times the length of the structure 27 or less.

[0022] In this method for inspecting a water-blocking structure, the length of tubular portion 23 in a direction perpendicular to pipe axis 37 of tubular portion 23 is 1 to 2 times or less the length of structure 27. The length of tubular portion 23 in a direction perpendicular to pipe axis 37 refers to the diameter when tubular portion 23 or structure 27 is, for example, a cylindrical pipe. More specifically, the inner diameter N1 of tubular portion 23 is 1 to 2 times or less the outer diameter G1 of drainage pipe 19, which is structure 27. By setting the length of the cylindrical portion 23 to 1 to 2 times the length of the structure 27 or less, an appropriate gap can be formed between the structure 27 and the water shielding body 21. If the length is 1 time, the cylindrical portion 23 is elastically deformed to insert the structure 27 into the inner hole 41 of the cylindrical portion 23. In this case, since the cylindrical portion 23 is made of a resin material, even if the cylindrical portion 23 has the same diameter as the structure 27, insertion by expanding is possible. Furthermore, although the annular gap S1 formed between the outer periphery of the structure 27 and the inner periphery of the cylindrical portion 23 is very small, it can be filled with the conductive liquid 51 due to capillary action. The first electrode 45 can be inserted into the annular gap S1 using a needle-shaped probe or the like. Furthermore, by setting the length (inner diameter N1) of the cylindrical portion 23 to 2 times the length (outer diameter G1) of the structure 27 or less, wrinkles that occur in the cylindrical portion 23 when the cylindrical portion 23 is joined to the outer periphery of the structure 27 can be suppressed. In this way, by forming an appropriate gap (gap S1) between the structure 27 and the water shielding body 21, it becomes easy to apply water pressure, insert the first electrode 45, inject the conductive liquid 51, and so on.

[0023] A method for inspecting a waterproof structure according to claim 8 of the present invention is the method for inspecting a waterproof structure according to claim 6, The length of the cylindrical portion 23 in the direction perpendicular to the tube axis 37 of the cylindrical portion 23 is 1 to 2 times the length of the structure 27 or less.

[0024] In this method for inspecting a water-impermeable structure, the function is the same as that of claim 7.

[0025] A method for inspecting a waterproof structure according to claim 9 of the present invention is a method for inspecting a waterproof structure according to claim 4 or 5, The inspection device 43 is characterized in that it is capable of applying a voltage of 300V or more.

[0026] In this watertight structure inspection method, the inspection device 43 can apply a voltage of 300 V or more. This makes it possible to detect with high sensitivity even leaks that are merely seepage from pinholes, cracks, or poorly joined areas. In this case, the inspection is performed by checking whether or not a detector detects sparks caused by air discharge. Air discharge also makes it possible to visually identify the approximate locations of pinholes, poorly joined areas, etc., by the flash of light.

[0027] A water-blocking structure inspection method according to claim 10 of the present invention is the water-blocking structure inspection method according to claim 6, The inspection device 43 is characterized in that it is capable of applying a voltage of 300V or more.

[0028] In this method for inspecting a water-impermeable structure, the operation is the same as that of claim 9.

[0029] A method for inspecting a waterproof structure according to claim 11 of the present invention is the method for inspecting a waterproof structure according to claim 7, The inspection device 43 is characterized in that it is capable of applying a voltage of 300V or more.

[0030] In this method for inspecting a water-impermeable structure, the operation is the same as that of claim 9.

[0031] A method for inspecting a waterproof structure according to claim 12 of the present invention is the method for inspecting a waterproof structure according to claim 8, The inspection device 43 is characterized in that it is capable of applying a voltage of 300V or more.

[0032] In this method for inspecting a water-impermeable structure, the operation is the same as that of claim 9.

[0033] The method for manufacturing a joining water-shielding body according to claim 13 of the present invention is characterized in that after the water-shielding body 75 is formed in a shape that conforms to the three-dimensional coating surface 73 of the structure 71 via an edge joint, an inspection is performed using the water-shielding structure inspection method according to claim 1 or 2 to obtain the three-dimensionally shaped water-shielding body 75.

[0034] In the manufacturing method of the joining water shielding bodies 77, 79, after joining the water shielding sheets formed into a three-dimensional shape that covers the three-dimensional covering surface 73 that will be at least a part of the structure 71 at their edge joints, an inspection is carried out using an inspection method for water shielding structures. In other words, in the manufacturing method of the joining water shielding bodies 77, 79, after forming the water shielding sheets into a three-dimensional shape, a watertightness inspection is always carried out on the edge joints.

[0035] The method for manufacturing a joining water-shielding body according to claim 14 of the present invention is characterized in that after the water-shielding body 75 is formed in a shape that conforms to the three-dimensional coating surface 73 of the structure 71 via an edge joint, inspection is performed using the water-shielding structure inspection method according to claim 3 to obtain the three-dimensionally shaped water-shielding body 75.

[0036] In this method of manufacturing a water shielding body for joining, the function is the same as that of claim 13.

[0037] The manufacturing method of the joint 29 described in claim 15 of the present invention is characterized in that after a joining process in which the end 24 on one end side of the tubular portion 23 is joined around the entire outer periphery of the structure 27, an inspection is performed using the water-proof structure inspection method described in claim 4 or 5 to obtain the joint 29 of the structure 27 and the water-proof body 21.

[0038] In the manufacturing method of this joined body 29, after the joining step in which the end portion 24 on one end side of the tubular portion 23 is joined around the entire outer periphery of the structure 27, an inspection is performed using an inspection method for a watertight structure. That is, in the manufacturing method of the joined body 29, a watertight inspection of this joined portion 25 is always performed after the joining step. For this reason, if the tubular portion 23 is, for example, a multi-layer pipe, the joining step and the inspection step are performed alternately. This makes it possible to avoid a situation in which the joined portion 25 on the lower layer is covered by the tubular portion 23 on the upper layer, making the watertight inspection impossible.

[0039] The manufacturing method of the joint 29 described in claim 16 of the present invention is characterized in that after a joining process in which the end 24 on one end side of the tubular portion 23 is joined around the entire outer periphery of the structure 27, an inspection is performed using the water-proof structure inspection method described in claim 6 to obtain the joint 29 of the structure 27 and the water-proof body 21.

[0040] This method for manufacturing a bonded body has the same effect as that of claim 15.

[0041] The manufacturing method of the joint 29 described in claim 17 of the present invention is characterized in that after a joining process in which the end 24 on one end side of the tubular portion 23 is joined around the entire outer periphery of the structure 27, an inspection is performed using the water-proof structure inspection method described in claim 7 to obtain the joint 29 of the structure 27 and the water-proof body 21.

[0042] This method for manufacturing a bonded body has the same effect as that of claim 15.

[0043] The manufacturing method of the joint 29 described in claim 18 of the present invention is characterized in that after a joining process in which the end 24 on one end side of the tubular portion 23 is joined around the entire outer periphery of the structure 27, an inspection is performed using the water-proof structure inspection method described in claim 8 to obtain the joint 29 of the structure 27 and the water-proof body 21.

[0044] This method for manufacturing a bonded body has the same effect as that of claim 15.

[0045] The manufacturing method of the joint 29 described in claim 19 of the present invention is characterized in that after a joining process in which the end 24 on one end side of the tubular portion 23 is joined around the entire outer periphery of the structure 27, an inspection is performed using the water-proof structure inspection method described in claim 9 to obtain the joint 29 of the structure 27 and the water-proof body 21.

[0046] This method for manufacturing a bonded body has the same effect as that of claim 15.

[0047] The manufacturing method of the joint 29 described in claim 20 of the present invention is characterized in that after a joining process in which the end 24 on one end side of the tubular portion 23 is joined around the entire outer periphery of the structure 27, an inspection is performed using the water-proof structure inspection method described in claim 10 to obtain the joint 29 of the structure 27 and the water-proof body 21.

[0048] This method for manufacturing a bonded body has the same effect as that of claim 15.

[0049] The manufacturing method of the joint 29 described in claim 21 of the present invention is characterized in that after a joining process in which the end 24 on one end side of the tubular portion 23 is joined around the entire outer periphery of the structure 27, an inspection is performed using the water-proof structure inspection method described in claim 11 to obtain the joint 29 of the structure 27 and the water-proof body 21.

[0050] This method for manufacturing a bonded body has the same effect as that of claim 15.

[0051] The manufacturing method of the joint 29 described in claim 22 of the present invention is characterized in that after a joining process in which the end 24 on one end side of the tubular portion 23 is joined around the entire outer periphery of the structure 27, an inspection is performed using the water-proof structure inspection method described in claim 12 to obtain the joint 29 of the structure 27 and the water-proof body 21.

[0052] This method for manufacturing a bonded body has the same effect as that of claim 15. [Effects of the Invention]

[0053] According to the water-blocking structure inspection method of the present invention, joint defects can be inspected with high accuracy.

[0054] According to the method for inspecting a waterproof structure as set forth in claim 2 of the present invention, the conductive liquid in contact with the edge joint is pressurized, so that extremely small holes through which water cannot pass due to surface tension can be visually inspected, enabling more accurate waterproof inspection.

[0055] According to the method for inspecting a waterproof structure as set forth in claim 3 of the present invention, a high voltage of 300 V is applied to the first electrode, making it easier to detect even minute amounts of water leakage, and enabling more accurate waterproof inspection.

[0056] According to the water-blocking structure inspection method of the fourth aspect of the present invention, it is possible to inspect for joint defects with high accuracy.

[0057] According to the waterproof structure inspection method described in claim 5 of the present invention, in addition to the structure and the waterproof body, it is possible to inspect with high accuracy the sheet joints between waterproof sheets in a tubular section constructed using multiple waterproof sheets.

[0058] According to the method for inspecting a waterproof structure as set forth in claim 6 of the present invention, the conductive liquid in contact with the joint is pressurized, so that extremely small holes through which water cannot pass due to surface tension can be visually inspected, enabling more accurate waterproof inspection.

[0059] According to the water-blocking structure inspection method of the seventh aspect of the present invention, an appropriate gap is formed between the structure and the water-blocking body, so that the inspection work can be carried out smoothly.

[0060] According to the water-blocking structure inspection method of the eighth aspect of the present invention, the same effect as that of the seventh aspect can be obtained.

[0061] According to the water-blocking structure inspection method of claim 9 of the present invention, a high voltage of 300 V is applied to the first electrode, making it easier to detect even minute amounts of water leakage and enabling more accurate water-blocking inspection.

[0062] According to the water-blocking structure inspection method of the tenth aspect of the present invention, the same effect as that of the ninth aspect can be obtained.

[0063] According to the water-blocking structure inspection method of the eleventh aspect of the present invention, the same effect as that of the ninth aspect can be obtained.

[0064] According to the water-blocking structure inspection method of the twelfth aspect of the present invention, the same effect as that of the ninth aspect can be obtained.

[0065] According to the manufacturing method of a joining water-proof body as set forth in claim 13 of the present invention, after the joining process, the product is completed through inspection using a water-proof structure inspection method, so that it is possible to select a joining water-proof body in which the edge joints between the water-proof sheets are joined with high water-proofing performance.

[0066] According to the method for manufacturing a water shield for joining as set forth in claim 14 of the present invention, the same effect as that of claim 13 can be obtained.

[0067] According to the manufacturing method of the joined body described in claim 15 of the present invention, after the joining process, the product is completed by undergoing inspection using a waterproof structure inspection method, so that joined bodies in which the structure and the waterproof body are joined with high waterproof performance can be selected.

[0068] According to the method for manufacturing a bonded body of the sixteenth aspect of the present invention, the same effect as that of the fifteenth aspect can be obtained.

[0069] According to the method for manufacturing a bonded body of the seventeenth aspect of the present invention, the same effect as that of the fifteenth aspect can be obtained.

[0070] According to the method for manufacturing a bonded body of the eighteenth aspect of the present invention, the same effect as that of the fifteenth aspect can be obtained.

[0071] According to the method for manufacturing a bonded body of the nineteenth aspect of the present invention, the same effect as that of the fifteenth aspect can be obtained.

[0072] According to the method for manufacturing a bonded body of the twentieth aspect of the present invention, the same effect as that of the fifteenth aspect can be obtained.

[0073] According to the method for manufacturing a bonded body of the twenty-first aspect of the present invention, the same effect as that of the fifteenth aspect can be obtained.

[0074] According to the method for manufacturing a bonded body of the twenty-second aspect of the present invention, the same effect as that of the fifteenth aspect can be obtained. [Brief explanation of the drawings]

[0075] [Figure 1] 1 is a perspective view of a final waste disposal site in which a joined body inspected by the waterproof structure inspection method according to the present embodiment is used. [Figure 2] FIG. 2 is an enlarged view of the main part showing the penetration part of the leachate collection and drainage pipe shown in FIG. [Figure 3] FIG. 3 is a perspective view of the water shielding body shown in FIG. 2. [Figure 4] FIG. [Figure 5] 1 is a partially cutaway side view showing the workpiece in the first step of the water-blocking structure inspection method. FIG. [Figure 6] FIG. 10 is a partially cutaway side view showing the workpiece in the second step of the water-blocking structure inspection method. [Figure 7] FIG. 3 is a vertical cross-sectional view of the penetration portion shown in FIG. 2, with the reinforcing block body omitted. [Figure 8] FIG. 4 is an exploded perspective view of a joining water shielding body that will become the water shielding body shown in FIG. 3. [Figure 9] FIG. [Figure 10] FIG. 10 is a side view showing a method for inspecting a joining water shielding body. [Figure 11] FIG. 10 is a schematic perspective view of a joining water shield and a structure according to another embodiment. [Figure 12] FIG. 10 is a perspective view of a joining water shielding body according to another embodiment. [Figure 13] FIG. 10 is a perspective view of a joining water shielding body according to another embodiment. [Figure 14]FIG. 10 is a perspective view showing a mode of obtaining a water shield from a joining water shield according to another embodiment. [Figure 15] FIG. 10 is a perspective view showing a mode of obtaining a water shield from a joining water shield according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0076] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a final waste disposal site 11 in which an assembly inspected by the waterproof structure inspection method according to this embodiment is used. In a final waste disposal site 11, a waterproof sheet is laid at the boundary between the inside and outside of the disposal site to prevent leachate such as sewage from leaking out from within the disposal site where waste is stored. The waterproof sheet is laid across the depression slope or dam slope 13 and the bottom surface 15 of the landfill space. Leachate generated within the disposal site 11 is transported to a water treatment facility through a leachate collection and drainage pipe 19 that is installed at the bottom surface 15 of the landfill space and extends through the waterproof sheet at a penetration part 17.

[0077] FIG. 2 is an enlarged view of a main part showing the penetration part 17 of the leachate collection drainage pipe 19 shown in FIG. Generally, such penetrations 17 are constructed by fitting a water shielding body 21 (see Figures 3 and 4), which is a processed product made of a waterproof sheet known as a "hat processed product," into the leachate collection and drainage pipe 19. The water shielding body 21 is fitted into a short pipe, which is part of the leachate collection and drainage pipe 19, and then the tubular portion 23 is joined at a joint 25. The short pipe to which the water shielding body 21 is joined will later be integrally connected to the leachate collection and drainage pipe 19. In this specification, the short pipe is also referred to as a structure 27 (see Figure 4). The water shielding body 21 and the structure 27 joined to this water shielding body 21 constitute a joint 29 (see Figure 4).

[0078] The connector 29 does not have to be configured to simply penetrate the slope 13, but may be configured to be attached to a reinforcing block body 16 made of concrete blocks or the like made by pouring concrete.

[0079] FIG. 3 is a perspective view of the water shield 21 shown in FIG. The water shielding body 21 includes the above-mentioned tubular portion 23 formed of a resin water shielding sheet 31. In this embodiment, the tubular portion 23 is fabricated into a cylinder by joining the short sides of rectangular water shielding sheets 31 together at tubular joints 33. The tubular portion 23 may also be fabricated by joining a plurality of water shielding sheets 31. When the structure 27 is a cylindrical pipe having a circular cross section perpendicular to the pipe axis, the tubular portion 23 is a cylinder having an inner diameter equal to or larger than the outer diameter of the cylindrical pipe.

[0080] The water shielding body 21 has, for example, a rectangular water shielding sheet 31 as a flange portion 35 on the other end side of the tubular portion 23. The flange portion 35 is made of the water shielding sheet 31. The water shielding sheet 31 can maintain the hat-shaped shape of the tubular portion 23 and the flange portion 35 by using a resin material with a predetermined hardness, such as a polyethylene-based resin. In this embodiment, the pipe axis 37 of the tubular portion 23 passes through the intersection of two diagonal lines of the flange portion 35. The water shielding body 21 is manufactured by watertightly joining the tubular portion 23 and the flange portion 35 at a flange joint 39 so that the pipe axis 37 is perpendicular to the surface of the flange portion 35. Alternatively, the tubular portion 23 and the flange portion 35 may be joined such that the pipe axis 37 is inclined at a predetermined angle with respect to the surface of the flange portion 35.

[0081] The waterproof sheet 31 that constitutes the waterproof body 21 is made of a resin material, preferably a flexible material, and may be in the form of a sheet, plate, tile, panel, etc., and may be a single seamless material or made up of multiple materials joined together.

[0082] FIG. 4 is a perspective view of the bonded body 29. As shown in FIG. The inner hole 41 of the tubular portion 23 opens as an opening on the back surface of the water shielding body 21, opposite to the surface of the flange portion 35 from which the tubular portion 23 protrudes. In other words, the structure 27 of the water shielding body 21, which is passed through the tubular portion 23, penetrates the flange portion 35. The end portion 24 of the tubular portion 23 opposite the flange portion 35 is one end side, and the flange portion 35 side is the other end side.

[0083] The structure 27 and the water shielding body 21 are connected, for example, by inserting the structure 27 into the opening of the tubular portion 23, which opens at the back surface of the flange portion 35, and the structure 27 protruding from one end side of the tubular portion 23. The end portion 24 of the tubular portion 23 on one end side is joined around the entire outer periphery of the structure 27. This joint becomes an annular joint portion 25 along the end portion 24. The joining is performed by, for example, resin welding, in which a resin melting rod is thermally melted. As a result, the tubular portion 23 and the structure 27, which serve as base materials, are melted and joined to the melting rod. It is preferable that the tubular portion 23 and the structure 27, which serve as base materials, are made of the same material, for example, a polyethylene-based resin, in order to make welding easier.

[0084] FIG. 5 is a partially cutaway side view showing the workpiece in the first step of the water-blocking structure inspection method. The method for inspecting a waterproof structure according to this embodiment inspects the joint 25 at which the structural body 27 and the water shielding body 21 are watertightly joined together using an inspection device 43. The water shielding body 21 includes a tubular portion 23 formed of a waterproof sheet 31. An end portion 24 on one end of the tubular portion 23 serves as the joint 25 that is joined around the entire outer periphery of the structural body 27. In other words, the end portion 24 on one end of the tubular portion 23 serves as the base material during resin welding, and fuses with a portion of the structural body 27 to form the bead-shaped joint 25.

[0085] The inspection device 43 includes a first electrode 45, a second electrode 47, a power supply unit (not shown) that applies a voltage to the first electrode 45, and a detector (not shown) that detects the current flowing between the first electrode 45 and the second electrode 47.

[0086] As an example, a needle-shaped probe or the like can be used as the first electrode 45. The needle-shaped first electrode 45 is configured to be easily inserted into the gap between the structure 27 and the cylindrical portion 23. The first electrode 45 is connected to an anode terminal of the inspection device main body 49 by a lead wire.

[0087] The second electrode 47 has, for example, a brush-shaped discharge portion. The discharge portion is configured to facilitate air discharge by embedding a large number of conductive wires. The second electrode 47 is connected to the cathode terminal of the inspection device main body 49 by a lead wire.

[0088] The power supply unit may be, for example, a storage battery, or may be a generator, or may be connected to a commercial power source.

[0089] The detector is provided between the second electrode 47 and the inspection device main body 49, or is built into the inspection device main body 49. The detector detects air discharge occurring between the first electrode 45 and the second electrode 47.

[0090] The inspection device 43 is configured to be able to apply a voltage of 300 V or more between the first electrode 45 and the second electrode 47. This makes it possible to generate an air discharge in which a current flows between the first electrode 45 and the second electrode 47, with air, which is an insulator, sandwiched between them. This allows the inspection device 43 to perform a spark inspection.

[0091] The spark test is not limited to air discharge as long as it is performed in a state where the second electrode 47 is not in contact with the joint 25. That is, the spark test may be performed by immersing the joint 25 in a conductive liquid 51 and bringing the second electrode 47 into contact with the conductive liquid 51 in which the joint 25 is immersed.

[0092] Alternatively, a conductive gel may be applied to the surface of the joint 25, and the second electrode 47 may be brought into contact with the conductive gel to perform a spark test. If a transparent conductive gel is used, the approximate locations of pinholes, poor joints, etc. may be visually confirmed by flashing light. When a conductive gel is used, the effort of providing a container for immersing the joint 25 outside the joint 25 can be eliminated. Furthermore, when using conductive gel and applying an alternating current, a flash of light can be generated at 100 V and a few watts, making it possible to confirm the approximate locations of pinholes, poor joints, etc. with a safe, low voltage.

[0093] In addition, the inspection device 43 is equipped with an alarm device that outputs a buzzer, alarm sound, or voice when the detector detects a discharge. The alarm device may be equipped with a visual indicator lamp, light, etc. in addition to sound.

[0094] Next, the procedure for inspecting the water-blocking structure will be described.

[0095] The inspection of the waterproof structure is carried out during the manufacturing process of the joint 29 to be inspected. Therefore, the inspection of the waterproof structure is carried out at the manufacturing plant of the joint 29 or the like.

[0096] In the waste final disposal site 11 where the assembly 29 is installed, multiple layers of waterproof sheets may be laid on the dam slope 13 or the bottom surface 15 of the landfill space. For this reason, the waterproof body 21 of the assembly 29 may be provided in multiple layers. In this embodiment, an example will be described in which the waterproof body 21 of the assembly 29 has two layers. Note that the waterproof body 21 of the assembly 29 may be a single layer, or may have two or more layers. In the case of two or more layers, the overlapping structure of the two layers will be repeated. When the tubular portion 23 is a multiple pipe (tube-in-tube), the waterproof structure is inspected by performing a spark inspection for each joint 25 between the tubular portion 23 and the structure 27 in each layer.

[0097] [Step 1] In the first step, the lower water shielding body 21 of the two-layer structure is inspected.

[0098] The method for inspecting a waterproof structure includes an installation step (A), an injection step (B), an insertion step (C), an application step (D), and an inspection step (E).

[0099] In the installation step (A), as shown in Fig. 5, the joint 25, which is one end side of the tubular portion 23 of the water shielding body 21, is placed facing downward, and the other end side (the flange portion 35 side) of the tubular portion 23 of the water shielding body 21 faces upward. For the installation, a jig, a stand, or the like (not shown) is used, and the pipe axis 37 of the joint body 29 is fixed in a position in which it is in the vertical direction.

[0100] In the injection step (B), a conductive liquid 51 is stored between the structure 27 and the cylindrical portion 23. Salt water is preferably used as the conductive liquid 51. The salt water is more preferably saturated salt water. Furthermore, a water pressure of 6.7 kPa or more is applied to the joint 25 between the structure 27 and the cylindrical portion 23 by the conductive liquid 51. This water pressure can be obtained by setting the height H of the water shield 21 in the joint 29 arranged in the vertical direction to 670 mm or more.

[0101] Here, in the joined body 29, the length of the cylindrical portion 23 in the direction perpendicular to the tube axis 37 of the cylindrical portion 23 is 1 to 2 times or less the length of the structure 27. The reason why the diameter is defined as "the length in the direction perpendicular to the tube axis 37 of the cylindrical portion 23" is because the cylindrical portion 23 and the structure 27 may be in a shape other than a circle, such as a rectangular tube.

[0102] As an example, the dimensions of the structure 27 and the bonded body 29 will be described. The outer diameter G1 of the structure 27 is 444 mm. The inner diameter N1 of the cylindrical portion 23 is 451 mm. The annular gap S1 between the outer periphery of the structure 27 and the inner periphery of the cylindrical portion 23 is 3.5 mm. The thickness of the waterproof sheet forming the cylindrical portion 23 and the flange portion 35 is 1.5 mm. The thickness of the structure 27 is 22 mm.

[0103] In the insertion step (C), the first electrode 45 is inserted into the stored conductive liquid 51. The first electrode 45 is a needle-like probe, which allows it to be easily inserted into the gap S1, which is about 3.5 mm wide, between the structure 27 and the cylindrical portion 23.

[0104] In the application step (D), a voltage is applied to the first electrode 45. The voltage is 300 V or more.

[0105] In the inspection step (E), after the above steps (A), (B), (C), and (D) are performed, second electrode 47 is brought a certain distance closer to the outside of joint 25. This allows a spark inspection to be performed, in which a detector is used to detect whether a current has flowed between first electrode 45 and second electrode 47.

[0106] When the detector detects a spark, the inspection device 43 emits an error sound, reporting the existence of an error, i.e., a pinhole, crack, or poor joint in the joint 25. A joint 25 in which leakage due to a pinhole or poor joint is confirmed is either rewelded or discarded. A workpiece that is the subject of inspection and in which leakage due to a pinhole or poor joint is not confirmed proceeds to the second step.

[0107] [Second Step] FIG. 6 is a partially cutaway side view showing the workpiece in the second step of the water-blocking structure inspection method. In the second step, the upper layer water shielding body 21 of the two-layer structure is inspected.

[0108] In the joint 29, the cylindrical portion 23 of the water shielding body 21 in the upper layer has a larger diameter than the cylindrical portion 23 of the water shielding body 21 in the lower layer.

[0109] As an example, the dimensions of the upper water shielding body 21 will be described. The inner diameter N2 of the upper cylindrical portion 23 is 490 mm. The annular gap S2 between the outer periphery of the structure 27 and the inner periphery of the upper cylindrical portion 23 is 23 mm.

[0110] The upper-layer tubular portion 23 has a longer dimension in the direction along the tube axis 37 from the flange portion 35 than the lower-layer tubular portion 23. Therefore, the joint 25 of the lower-layer tubular portion 23 is covered by the upper-layer tubular portion 23. In the second step, the upper-layer tubular portion 23 is joined to the workpiece that was determined to be a good product in the spark inspection in the first step, and the joint 25 of the upper-layer tubular portion 23 is subjected to a spark inspection.

[0111] The spark test for the upper cylindrical portion 23 is almost the same as the spark test performed for the lower cylindrical portion 23. However, in the injection step (B) and the insertion step (C), the lower flange portion 35 is lifted upward and held on the outer periphery of the structure 27 by wire 53 or the like serving as a restraining member, and is retracted so as not to interfere with the injection of the conductive liquid 51 or the insertion of the first electrode 45. The other procedures are the same as the spark test for the joint 25 in the lower cylindrical portion 23.

[0112] In the second step, joints 25 where leakage is confirmed due to pinholes, cracks, poor joints, etc. are either rewelded or discarded. The workpieces that are inspected and where leakage due to pinholes, poor joints, etc. is not confirmed become a multi-layered joint 29, and the manufacturing of the product is completed.

[0113] Thus, in the manufacturing method of the joined body 29 according to this embodiment, after the joining process in which the end portion 24 on one end side of the tubular portion 23 is joined around the entire outer periphery of the structure 27, the above-mentioned spark test is performed to obtain the joined body 29 of the structure 27 and the water-shielding body 21.

[0114] In addition, when the water-resistant body 21 has a sheet joint (not shown) formed by joining multiple water-resistant sheets together, the method for inspecting the water-resistant structure may involve an inspection step (F) in which a second electrode 47 is brought close to the sheet joint by a certain distance from the outside and a detector is used to detect whether a current has flowed between the first electrode 45 and the second electrode 47, in combination with the inspection step (E).

[0115] FIG. 7 is a vertical cross-sectional view of the through-portion shown in FIG. 2, omitting the reinforcing block body 16. FIG. After completing the inspection using the above-mentioned waterproof structure inspection method and confirming that the joint body 29 has high waterproof performance, it is disposed along the bottom surface 15 of the landfill space, penetrating the slope 13 and the waterproof sheets 61, 63 covering this slope 13. A portion of the joint body 29 disposed on the bottom surface 15 of the landfill space may be embedded in the above-mentioned reinforcing block body 16 (see Figure 2).

[0116] The waterproof sheet covering the slope 13 is laid in a two-layer structure, for example, an upper waterproof sheet 61 and a lower waterproof sheet 61. In this case, the waterproof sheet covering the bottom surface 15 of the landfill space is also laid in a two-layer structure, an upper waterproof sheet 65 and a lower waterproof sheet 67. In this case, the joint 29 is also laid in a two-layer structure (see Figure 6) in which the waterproof sheet 31 has a two-layer structure.

[0117] The lower flange portion 35 of the two-layered joint body 29 is joined to the lower waterproof sheets 61, 65 of the slope 13 and the bottom surface 15 of the landfill space at the lower fusion portion 55 by fusion with a self-propelled fusion device. Also, the upper flange portion 35 of the two-layered joint body 29 is joined to the upper waterproof sheets 63, 67 of the slope 13 and the bottom surface 15 of the landfill space at the upper fusion portion 57 by fusion with a self-propelled fusion device. Note that the joint body 29 joined to the respective waterproof sheets 61, 63, 65, 67 of the slope 13 and the bottom surface 15 of the landfill space can be aligned to the inner corner shape of the landfill space bottom surface 15 and the slope 13 by bending the flange portion 35 as necessary, and can be positioned accordingly.

[0118] Next, the operation of the above-described configuration will be described.

[0119] In the method for inspecting a waterproof structure according to this embodiment, the joint 25 at which the structure 27 and the water-shielding body 21 are watertightly joined can be inspected using an inspection device 43. The structure 27 may be a pipe or a column. For example, the cross section of the pipe perpendicular to the pipe axis may be a circle, an ellipse, or a polygon. The structure 27 is formed from a resin material. The joint 29 in which the structure 27 and the water-shielding body 21 are joined at the joint 25 is inspected (watertightness inspection) for the watertightness (watertightness) of the joint 25 using the inspection device 43.

[0120] In a watertightness inspection, the joint 25 at one end of the tubular portion 23 of the water shielding body 21 is oriented downward (vertically downward), and the flange 35 at the other end of the tubular portion 23 is oriented upward. In other words, the tubular portion 23 is oriented with its tube axis 37 oriented vertically. A conductive liquid 51 is injected between the structure 27 and the tubular portion 23 from the opening of the tubular portion 23 that opens at the flange 35.

[0121] The injected conductive liquid 51 is stored in an annular gap that has the joint 25 at the bottom and is interposed between the outer periphery of the structure 27 and the inner periphery of the cylindrical portion 23 .

[0122] A first electrode 45 is inserted into the annular gap that opens at the flange portion 35 and contacts the stored conductive liquid 51. Next, a voltage is applied to the first electrode 45, and a second electrode 47 is brought close to the outside of the joint 25 by a certain distance. A detector of the inspection device 43 detects whether a current has flowed between the first electrode 45 and the second electrode 47.

[0123] That is, after the conductive liquid 51 is stored in the annular gap at a predetermined pressure for a predetermined time, a spark test is performed by bringing the second electrode 47 close to the joint 25. The test is performed by bringing the second electrode 47 close to the joint 25 and checking whether or not a spark caused by air discharge is detected by the detector. The air discharge also makes it possible to visually identify the approximate locations of pinholes, cracks, poor joints, etc. by the flash of light.

[0124] When the detector detects a spark, the inspection device 43 emits an error sound to notify of the error, i.e., the presence of a pinhole or a poor joint in the joint 25. If the cylindrical portion 23 is a multi-tube (tube-in-tube) structure, this spark inspection is performed on each cylindrical portion 23 in each layer.

[0125] Joints 25 where water leakage is confirmed due to pinholes or poor joints are either rewelded or discarded. Workpieces where water leakage due to pinholes or poor joints is not confirmed become joined bodies 29, and the manufacturing of the product is completed.

[0126] In this method for inspecting a water-blocking structure, the joint 25 between the outer peripheral surface of the structure 27 and the end 24 at one end side of the tubular portion 23 can be inspected.

[0127] Furthermore, the annular gap joint 25 is positioned on the bottom side and the conductive liquid 51 is stored therein, so a predetermined water pressure can be applied to the joint 25 that is the target of the watertightness inspection. This makes it possible to visually check and detect even minute pinholes, cracks, and poor joints without overlooking them.

[0128] Furthermore, the time and effort required to embed piano wire in the build-up portion, which was previously required in the conventional method, is eliminated.

[0129] Furthermore, since no piano wire is installed, even if there is no defect in the joint 25, there is no risk of it being erroneously detected as damaged due to poor installation position of the piano wire.

[0130] Furthermore, since no metal piano wire remains at the joint 25, there is no risk of the sheet being damaged over time.

[0131] Furthermore, in this waterproof structure inspection method, the waterproof body 21 has a sheet joint formed by joining waterproof sheets together. The watertightness inspection may be performed not only on the joint 25 between the structure 27 and the waterproof body 21 but also on the sheet joint between the multiple waterproof sheets that make up the waterproof body 21. The waterproof body 21 is formed by rolling up a single waterproof sheet 31 and joining both end edges to form the tubular portion 23. However, for example, multiple waterproof sheets 31 may be used and both ends of each waterproof sheet 31 may be joined to form a single tubular body. In this case, it is possible to perform a watertightness inspection of the sheet joints that join the waterproof sheets 31 together. As a result, in addition to the structure 27 and the waterproof body 21, it is possible to inspect with high accuracy the sheet joints between the waterproof sheets in the tubular portion 23 formed using multiple waterproof sheets 31.

[0132] In this watertight structure inspection method, in the inspection process, a water pressure of 6.7 kPa or more is applied to joint 25 between structure 27 and tubular portion 23 by conductive liquid 51. In the watertight inspection, joint 25, which is one end side of tubular portion 23 of water-shielding body 21, is oriented downward, and the other end side of tubular portion 23 of water-shielding body 21 is oriented upward, with tube axis 37 of tubular portion 23 oriented vertically. Conductive liquid 51 is injected between structure 27 and tubular portion 23 from an opening on the other end side of tubular portion 23 that opens on the flange portion 35 side. At this time, the load of conductive liquid 51 acts on joint 25, which is positioned at the lower end of the annular cavity in which conductive liquid 51 is stored.

[0133] In the watertightness test, the total length of the cylindrical portion 23 in the direction along the tube axis 37 is set to 67 cm or more. In other words, a water pressure of 6.7 kPa or more is applied by the conductive liquid 51 to the annular gap side of the joint 25.

[0134] This allows the conductive liquid 51 to pass through tiny holes that water cannot pass through due to surface tension during a watertightness inspection. The conductive liquid 51 that passes through the tiny holes in the joint 25 flows out (oozes out) to the outside of the joint 25, allowing for visual inspection and making it easier to detect by the second electrode 47. As a result, since the conductive liquid 51 in contact with the joint 25 is pressurized, it is possible to inspect tiny holes that water cannot pass through due to surface tension, enabling more accurate watertightness inspections.

[0135] Furthermore, this watertight structure inspection method allows the inspection device 43 to apply a voltage of 300 V or more. This makes it possible to detect leaks of a magnitude similar to seepage from pinholes, cracks, or poorly welded areas with high sensitivity. In this case, the inspection is performed by detecting sparks caused by air discharge using a detector. Air discharge also makes it possible to visually identify the approximate locations of pinholes, poorly welded areas, etc. by the flash of light. As a result, a high voltage of 300 V is applied to the first electrode 45, making it easier to detect even minute leaks, enabling more accurate watertight inspections.

[0136] Furthermore, in this method for inspecting a water-blocking structure, the length of tubular portion 23 in a direction perpendicular to the tube axis 37 of tubular portion 23 is 1 to 2 times or less the length of structure 27. The length of tubular portion 23 in a direction perpendicular to the tube axis 37 is the diameter when tubular portion 23 or structure 27 is, for example, a cylindrical pipe.

[0137] By making the length of tubular portion 23 1 to 2 times or less the length of structure 27, that is, by making the inner diameter of tubular portion 23 1 to 2 times or less the outer diameter of structure 27 in the case of a cylindrical pipe, it becomes possible to form an appropriate gap between structure 27 and water shielding body 21. If it is set to 1 time, tubular portion 23 will be elastically deformed and structure 27 will be inserted into inner hole 41 of tubular portion 23. In this case, because cylindrical portion 23 is made of a resin material, it can be inserted by expanding even if it has the same diameter as structure 27. The annular gap formed between the outer periphery of structure 27 and the inner periphery of cylindrical portion 23 is very small, but it can be filled with conductive liquid 51 by capillary action.

[0138] First electrode 45 can be inserted into the annular gap using a needle-shaped probe or the like. Furthermore, by making the length (inner diameter) of tubular portion 23 equal to or less than twice the length (outer diameter) of structure 27, it is possible to suppress the occurrence of wrinkles in tubular portion 23 when joining tubular portion 23 to the outer periphery of structure 27.

[0139] In this way, by forming an appropriate gap between the structure 27 and the water shielding body 21, it becomes possible to easily perform operations such as applying water pressure, inserting the first electrode 45, and injecting the conductive liquid 51. As a result, since an appropriate gap is formed between the structure 27 and the water shielding body 21, inspection operations can be performed smoothly.

[0140] In the manufacturing method of the joined body 29 according to this embodiment, after the joining step in which the end portion 24 on one end side of the tubular portion 23 is joined around the entire outer periphery of the structure 27, an inspection is performed using a watertight structure inspection method. That is, in the manufacturing method of the joined body 29, a watertight inspection of this joined portion 25 is always performed after the joining step. Therefore, if the tubular portion 23 is, for example, a multi-layer pipe, the joining step and the inspection step are performed alternately. This makes it possible to avoid a situation in which the joined portion 25 on the lower layer is covered by the tubular portion 23 on the upper layer, making the watertight inspection impossible.

[0141] Next, a method for inspecting the water shielding body 21 itself for constructing the above-mentioned joint body 29 will be described. As described above, the water shielding body 21 is used in a disposal site 11, etc., as a joint 29 by combining it with a structure 27, but the water shielding body 21 itself is formed by joining water shielding sheets 31, and it is necessary to inspect the joint parts. In this embodiment, the inspection is of the water-shielding body 21 shown in Figure 3, which is the hat-processed product described above.As described above, the water-shielding body 21 is configured to have a tubular portion 23 formed from a resin water-shielding sheet 31, and a flange portion 35 made of a rectangular water-shielding sheet at the end of this tubular portion 23.

[0142] This hat-shaped water shielding body 21 itself is made by combining water shielding sheets 31, and as shown in Figure 8, the short sides 32 of rectangular water shielding sheets 31 are joined together to form a cylinder as a tubular joint 33. Next, a square-shaped water shielding sheet 31 is tightly attached to the end of the cylinder, that is, it is arranged so that it has a bottom on the cylinder, and the outer periphery of the end of the cylinder is joined to the square sheet as shown in Figure 9. This joint is an edge joint, which becomes a flange joint 39. The bottomed tubular processed body made in this way becomes the water shielding body for joining 20.

[0143] The joining water shield 20 is a processed body that can be said to be a part used in the stage before it becomes the above-mentioned water shield 21, that is, a finished product that will become a water shield structure, and is a member for obtaining the three-dimensional water shield 21 that covers the surface of the above-mentioned three-dimensional structure 27 such as the short pipe. Then, the water shielding performance of the above-mentioned joint portion of this joining water shield 20 itself, that is, the flange joint portion 39, is inspected.

[0144] FIG. 10 is a side view showing an outline of the inspection method. The inspection method for the joint water-shielding body 20 is the same as the inspection method for the joint body 29 described above, and detailed explanation will be omitted, but as shown in Figure 10, the flange portion 35 is placed downward and the open side of the tubular portion 23 is placed upward, and inspection is performed on the flange joint portion 39. The cylindrical portion 23 is in the form of a bottomed tube made of a rectangular waterproof sheet, and a conductive liquid 51 such as saline solution is stored inside the tube with the bottom 36 facing downwards. As in the procedure of the above-mentioned inspection method, the height of the conductive liquid 51 is set to 670 mm or more, and the water pressure at the flange joint 39 is set to 6.7 kPa or more.

[0145] Then, the first electrode 45 is inserted into the conductive liquid 51 from the upper end of the cylindrical portion 23, and after applying a voltage, the second electrode 47 is brought a certain distance closer to the flange joint 39, and a spark test is performed in the same manner as above.

[0146] When the detector detects a spark, the inspection device 43 emits an error sound to notify of the error, i.e., the presence of a pinhole, crack, poor joint, etc. in the flange joint 39. A flange joint 39 in which water leakage due to a pinhole, poor joint, etc. is confirmed is either rewelded or discarded. If water leakage due to a pinhole, poor joint, etc. is not confirmed, it becomes a joining water shield 20.

[0147] The joining water shield 20 is obtained by hollowing out the bottom 36 inside the tubular portion 23 to form a through structure so that it becomes the above-mentioned water shield 21 and serves as a covering member for joining to a structure 27 such as a short pipe.

[0148] Furthermore, the water shielding body 21 and the connecting water shielding body 20 formed into this water shielding body 21 are not limited to the hat shape described above, i.e., they are not limited to a shape having a cylindrical portion 23 and a flange portion 35, and may be any desired three-dimensional shape.

[0149] For example, it may be a water-blocking body 75 for covering a three-dimensional covering surface 73 consisting of a shape formed by combining flat surfaces, such as an external corner portion M or an internal corner portion V in FIG. 11, which is at least a part of a rectangular parallelepiped structure 71 or a structure 71 consisting of a three-dimensional object that forms the boundary with the surrounding wall surface portions.

[0150] As shown in the figure, this water shielding body 75 (75A, 75B) has a shape made up of three planes arranged and connected at right angles to each other, but to produce this shape using water shielding sheet 31, a combination of folding and joining is required, and at least one ridge line joins the edge portions of the sheet together. The above-mentioned inspection is carried out on this joint, that is, the edge joint, and a three-dimensional product, namely water shielding body 75, is formed.

[0151] These inside corner shapes and outside corner shapes can be obtained by manufacturing and using a connecting water shield 77 having a square tube portion 81 and a flange portion 83 as shown in Figure 12, or a connecting water shield 79 having a square tube shape with a bottom as shown in Figure 13.

[0152] The connecting water shield 77 shown in Figure 12, which has a rectangular tubular portion 81 and a flange portion 83, has a shape similar to the connecting water shield 20, which has the above-mentioned tubular portion 23 and flange portion 35. That is, first, a rectangular water shielding sheet is folded and the short sides are joined to form the rectangular tubular portion 81. Next, a square-surfaced water shielding sheet 31 is joined to the end of this rectangular tubular portion 81. The tube joint (not shown), which is the joint between the short sides of the rectangular tubular portion 81, is formed parallel to the folded portion. However, it may be a portion that constitutes the surface of the rectangular tube or a ridge portion of the folded portion. However, as long as it is a portion that constitutes the surface, it can be used as a cutting point in the next process, which means that a water shielding inspection at this tube joint can be omitted.

[0153] In the case of this joint water shield 77, similar to the inspection of the cylindrical joint water shield 20 shown in FIG. 10, the inspection is carried out by storing a conductive liquid 51 such as saline solution in the square tube. In other words, by positioning the open side facing upward so as to form a concave shape including the edge joint, the edge joint to be inspected is immersed in the conductive liquid 51, thereby making it possible to inspect the flange joint 85, which is the joint (edge ​​joint) between the square tube portion 81 and the flange portion 83.

[0154] Furthermore, the joint water shield 79 in the shape of a rectangular cylinder with a bottom as shown in FIG. 13 is shaped so that it can store a conductive liquid inside, which makes it possible to inspect the joint portion. In the case of this joint water barrier 79, if we assume that all of the ridges are the same length, it is possible to create its shape from the unfolded diagram of a cube, and a bottomed square tube shape can be obtained with at least four bends and four joints, and inspections will be carried out on each of these joints. In other words, by positioning the open side facing upward so as to form a concave shape that includes the edge joint, the edge joint to be inspected is immersed in the conductive liquid 51, thereby making it possible to inspect the joint portion (edge ​​joint).

[0155] Then, as shown in Figure 14, by cutting the center of each face along the axis so as to divide each of the four ridge lines 87 of the square tube portion 81 and removing the bottom portion 89, a water-shielding body 75B is obtained that has a three-dimensional shape with two faces that intersect at right angles in an L-shape and one flange-shaped face on the outside of it, and a shape in which internal corners intersect at right angles and are continuous, resulting in a shape that makes it possible to cover the parts of the structure 71 as shown in Figure 11 that are made up of the ridge lines and valley lines of the external and internal corners.

[0156] Furthermore, as shown in Figure 15, by cutting the center of each of the four faces along the axis and dividing the bottom 89 into four parts in the same manner as above, the water-shielding body 75A is obtained in an approximately triangular pyramid shape with three faces adjacent to one corner at the center, and this shape makes it possible to cover each part of the structure 71 as shown in Figure 11, such as an external corner, which is a convex part consisting of three ridge lines, and an internal corner, which is a concave part consisting of three valley lines.

[0157] With these shapes of water-shielding bodies 75A, 75B, it is possible to cover the three-dimensional covering surface 73 including the protruding corner portions M and the recessed corner portions V of a three-dimensional structure 71 that has protruding corner portions M and recessed corner portions V, which cannot be covered with simple sheet material, using the water-shielding bodies 75A, 75B after undergoing a water-shielding inspection.

[0158] Then, by joining waterproof sheets to these waterproof bodies 75A, 75B in positions that fill the gaps between them, it is possible to obtain a three-dimensional waterproof body that covers the entire three-dimensional surface of the structure 71. Furthermore, by joining it to the structure in the same manner as in the above-described embodiment, it is possible to obtain an assembled body with high waterproof performance.

[0159] Furthermore, even if the joining water shields 77, 79 have a three-dimensional shape different from the square cylindrical structure described above, by positioning the open side facing upward so that they have a concave shape including the edge joint that forms that shape, the edge joint to be inspected will be immersed in the conductive liquid 51, and inspection of the joint portion (edge ​​joint) will be possible.

[0160] Therefore, according to the inspection method for a waterproof structure of this embodiment, it is possible to inspect with high accuracy for poor bonding in the joints of a three-dimensional shape made of waterproof sheets and formed by joining these waterproof sheets.

[0161] Furthermore, according to the manufacturing method of the joined body 29 of this embodiment, after the joining process, the product is completed after being inspected using an inspection method for water-proof structures, so that joined bodies 29 in which the structure 27 and the water-proof body 21 are joined with high water-proof performance can be selected, and joined bodies 29 with high water-proof performance can be obtained.

[0162] Furthermore, according to the manufacturing method of the joining water-shielding bodies 77, 79 of this embodiment, after the process of joining them to form a shape that covers the three-dimensional covering surface 73, the three-dimensional shape is completed after inspection using a water-shielding structure inspection method, so that the joining water-shielding bodies 77, 79 themselves can have high water-shielding performance, and a joined body with high water-shielding performance can be obtained. [Explanation of symbols]

[0163] 21...Water barrier 23...Cylindrical part 24...End 25…Joint part 27,71...Structure 29…Zygote 31...Waterproof sheet 37…Tube shaft 43...Inspection equipment 45...first electrode 47…Second electrode 51...Conductive liquid 73…3D covering surface 75A, 75B...Waterproof body 85...Edge joint

Claims

1. A waterproof body is made of a waterproof sheet that covers a three-dimensional covering surface that is at least a part of a structure, and an inspection method is provided for inspecting an edge joint of the waterproof sheet that forms a three-dimensional shape of the waterproof body along the three-dimensional covering surface using an inspection device, the inspection device includes a first electrode, a second electrode, a power supply unit that applies a voltage to the first electrode, and a detector that detects a current flowing between the first electrode and the second electrode; an installation step (A) of arranging a concave portion including the edge joint in the three-dimensional portion of the water shielding body so that an open side faces upward; a pouring step (B) of storing a conductive liquid in the recessed portion so that the edge joint portion is immersed in the conductive liquid; an insertion step (C) of inserting the first electrode into the stored conductive liquid; an application step (D) of applying a voltage to the first electrode; Including, After carrying out the steps (A), (B), (C), and (D), an inspection step (E) is performed in which the second electrode is brought close to the outer side of the edge joint by a predetermined distance, and whether or not a current flows between the first electrode and the second electrode is detected by the detector; A method for inspecting a watertight structure.

2. 2. The method for inspecting a waterproof structure according to claim 1, wherein a water pressure of 6.7 kPa or more is applied to the edge joint by the conductive liquid.

3. 3. The method for inspecting a waterproof structure according to claim 1, wherein the inspection device is capable of applying a voltage of 300 V or more.

4. An inspection method for inspecting a watertight joint between a structure and a water shielding body using an inspection device, comprising: the water-shielding body includes a tubular portion formed of a water-shielding sheet, and one end of the tubular portion is a joint portion that is joined to the outer periphery of the structure over the entire periphery; the inspection device includes a first electrode, a second electrode, a power supply unit that applies a voltage to the first electrode, and a detector that detects a current flowing between the first electrode and the second electrode; an installation step (A) of arranging the water shielding body so that the joint portion, which is one end side of the tubular portion of the water shielding body, faces downward and the other end side of the tubular portion of the water shielding body faces upward; an injection step (B) of storing a conductive liquid between the structure and the cylindrical portion; an insertion step (C) of inserting the first electrode into the stored conductive liquid; an application step (D) of applying a voltage to the first electrode; Including, After carrying out the steps (A), (B), (C), and (D), an inspection step (E) is performed in which the second electrode is brought close to the joint by a certain distance from the outside thereof, and whether or not a current flows between the first electrode and the second electrode is detected by the detector; A method for inspecting a watertight structure.

5. The water shielding body includes a sheet joint formed by joining a plurality of water shielding sheets together, The method for inspecting a waterproof structure as described in claim 4, characterized in that it includes an inspection step (F) in which the second electrode is brought close to the sheet joint by a certain distance from the outside and the detector detects whether a current flows between the first electrode and the second electrode.

6. 6. The method for inspecting a waterproof structure according to claim 4, wherein a water pressure of 6.7 kPa or more is applied to the joint between the structure and the cylindrical portion by the conductive liquid.

7. A method for inspecting a watertight structure as described in claim 4 or 5, characterized in that the length of the cylindrical portion in a direction perpendicular to the tube axis of the cylindrical portion is 1 to 2 times or less the length of the structure.

8. The method for inspecting a watertight structure according to claim 6, characterized in that the length of the cylindrical portion in a direction perpendicular to the pipe axis of the cylindrical portion is 1 to 2 times or less the length of the structure.

9. 6. The method for inspecting a waterproof structure according to claim 4, wherein the inspection device is capable of applying a voltage of 300 V or more.

10. 7. The method for inspecting a waterproof structure according to claim 6, wherein the inspection device is capable of applying a voltage of 300 V or more.

11. 8. The method for inspecting a waterproof structure according to claim 7, wherein the inspection device is capable of applying a voltage of 300 V or more.

12. 9. The method for inspecting a waterproof structure according to claim 8, wherein the inspection device is capable of applying a voltage of 300 V or more.

13. A method for manufacturing a water-shielding body for joining, characterized in that after the water-shielding body is formed in a shape that conforms to the three-dimensional coating surface of the structure via an edge joint, an inspection is carried out using the water-shielding structure inspection method described in claim 1 or 2 to obtain the three-dimensionally shaped water-shielding body.

14. A method for manufacturing a water-shielding body for joining, characterized in that after the water-shielding body is formed in a shape that conforms to the three-dimensional coating surface of the structure via an edge joint, an inspection is performed using the water-shielding structure inspection method described in claim 3 to obtain the three-dimensionally shaped water-shielding body.

15. A method for manufacturing a joint, characterized in that after a joining process in which an end portion on one end side of the tubular portion is joined around the entire outer periphery of the structure, an inspection is performed using the water-proof structure inspection method described in claim 4 or 5 to obtain a joint of the structure and the water-proof body.

16. A method for manufacturing a joint, characterized in that after a joining process in which one end of the tubular portion is joined around the entire outer periphery of the structure, an inspection is performed using the water-proof structure inspection method described in claim 6 to obtain a joint of the structure and the water-proof body.

17. A method for manufacturing a joint, characterized in that after a joining process in which an end portion on one end side of the tubular portion is joined around the entire outer periphery of the structure, an inspection is performed using the water-proof structure inspection method described in claim 7 to obtain a joint of the structure and the water-proof body.

18. A method for manufacturing a joint, characterized in that after a joining process in which an end portion on one end side of the tubular portion is joined around the entire outer periphery of the structure, an inspection is performed using the water-proof structure inspection method described in claim 8 to obtain a joint of the structure and the water-proof body.

19. A method for manufacturing a joint, characterized in that after a joining process in which an end portion on one end side of the tubular portion is joined around the entire outer periphery of the structure, an inspection is performed using the water-proof structure inspection method described in claim 9 to obtain a joint of the structure and the water-proof body.

20. A method for manufacturing a joint, characterized in that after a joining process in which an end portion on one end side of the tubular portion is joined around the entire outer periphery of the structure, an inspection is performed using the water-proof structure inspection method described in claim 10 to obtain a joint of the structure and the water-proof body.

21. A method for manufacturing a joint, characterized in that after a joining process in which an end portion on one end side of the tubular portion is joined around the entire outer periphery of the structure, an inspection is performed using the water-proof structure inspection method described in claim 11 to obtain a joint of the structure and the water-proof body.

22. A method for manufacturing a joint, characterized in that after a joining process in which an end portion on one end side of the tubular portion is joined around the entire outer periphery of the structure, an inspection is performed using the water-proof structure inspection method described in claim 12 to obtain a joint of the structure and the water-proof body.

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