Inspection device and inspection method for a structure

Abstract

To enable a long-period usage by suppressing abrasion of rolling impactors.SOLUTION: An inspection device for use in hammering inspection of a wall surface of a structure, includes a plurality of support shafts 11 provided in the periphery of a head part, rolling impactors 12 rotatably supported at tip ends of the respective support shafts 11 and rolling while coming into contact with the surface of the structure, a drive unit supportingly rotating the head part, and a support part 30 holding or moving the drive unit at a required height with respect to the structure. Each rolling impactor 12 is formed of a material with Rockwell hardness of 40 or more, and is a polyhedron having opposite sides whose cross-sectional shape is a polygonal shape from pentagon to dodecagon, and whose longitudinal shape is a circular-arc or elliptic-arc shape.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an inspection apparatus and an inspection method for a structure, which are used to nondestructively inspect the presence or absence of peeling, deterioration, expansion, air or foreign matter intrusion, etc. in mortar, tiles, concrete, etc. that form the wall portion of the structure from the surface side thereof.

Background Art

[0002] Conventionally, when peeling, deterioration, expansion, air or foreign matter intrusion, etc. occur in mortar, tiles, etc. attached or pasted to the wall portion of a building, the portion where peeling, etc. has occurred may fall off, which may cause an accident. Therefore, regular inspections are carried out. As such an inspection method, an elevating gondola is suspended from the rooftop of the building, and a worker on the elevating gondola strikes with an inspection hammer, and the presence or absence of peeling parts of mortar, etc. is determined by the reverberation sound. Such a method is generally called a tapping method.

[0003] As inspection tools used in such a general tapping method, various inspection tools are known. For example, it includes a rolling ball rotatably supported by a tip support shaft portion of an operation rod. While the operator holds the operation rod and presses the rolling ball against the surface of a structure, etc., by swinging or moving the operation rod left and right, forward and backward, or up and down, an inspection tool is known that can distinguish a portion where peeling, etc. has occurred from a sound portion by the impact sound generated when the rolling ball rolls, similar to an inspection hammer (Patent Document 1).

[0004] Furthermore, an inspection apparatus is known that includes a plurality of support shafts provided around a head portion and rolling balls rotatably supported at the tips of the respective support shafts, and rotates the rolling balls at the tip portions of the support shafts provided around the head portion. When an operator using this apparatus holds an extendable rod and presses the rolling ball against the surface of a structure, etc., and swings or moves the operation rod left and right, forward and backward, or up and down, an impact sound is generated when the rolling ball rolls (Patent Document 2).

Prior Art Documents

Patent Documents

[0005] Patent Document 1 Japanese Unexamined Patent Application Publication No. 2004-028581 Patent Document 2 Utility Model Registration No. 3159983 Summary of the Invention Problems to be Solved by the Invention

[0006] However, when the inspection tool of Patent Document 1 rolls the rolling element, it is necessary to swing or move the operation lever left and right, forward and backward, or up and down. Since the inspection range reaches a wide area of the building, the load on the worker is extremely large.

[0007] In addition, the inspection device of Patent Document 2 can be inspected without manually swinging or moving the operation lever left and right to roll the rolling element, so the burden on the worker is reduced. However, since the rolling element constantly contacts the wall surface, the rolling element quickly wears out, making it difficult to use for a long period of time.

[0008] The present invention has been made in view of such circumstances, and an object thereof is to provide an inspection device for a structure or the like that suppresses wear of a rolling element and enables long-term use. Means for Solving the Problems

[0009] (1) To achieve the above object, the inspection device of the present invention is an inspection device used for percussion inspection of the wall surface of a structure, and includes a plurality of support shafts provided around a head portion, rolling elements rotatably supported at the tips of the respective support shafts and rolling while contacting the surface of the structure, a drive device for supporting and rotating the head portion, and a support portion for holding or moving the drive device at a desired height with respect to the structure. Each of the rolling elements is formed of a material having a Rockwell hardness of 40 or more, has a cross-sectional outer shape of a polygon with 5 to 12 sides, and is composed of a polyhedron having opposing sides with an arc or elliptical arc shape in a longitudinal cross-sectional outer shape.

[0010] This makes it possible to reduce the workload of the inspection worker. Further, by forming the transfer roller from a material having a Rockwell hardness of 40 or more, wear of the transfer roller can be suppressed, and it becomes possible to use it for a long period of time.

[0011] (2) Further, in the inspection apparatus of the present invention, each of the support shafts is formed of a material and a cross-sectional shape having a flexural rigidity of 750 kN / cm or more, and is radially provided from a rotating member provided on the outer peripheral surface of the head portion such that the angle between the support shafts is 100 degrees or more and 170 degrees or less. The distance between the foot of the perpendicular line dropped from the head portion to the surface of the structure and the contact point where the transfer roller contacts the surface of the structure is defined as the support shaft radius, the support shaft radius is 50 mm or more and 250 mm or less, and each of the transfer rollers is in contact with the surface of the structure at the same inclination angle.

[0012] In this way, by forming the support shaft from a material and a cross-sectional shape having a flexural rigidity of 750 kN / cm or more, it is possible to suppress the shaft from wobbling and withstand the pressure of pressing the inspection apparatus against the structure. As a result, it is possible to suppress the contact of the head portion with the structure and ensure the followability of the transfer roller to the wall surface. Further, by providing the support shafts such that the angle between the support shafts is 100 degrees or more and 170 degrees or less and setting the support shaft radius to 50 mm or more and 250 mm or less, it is possible to widen the range that can be inspected at one time without the head portion contacting the structure while maintaining the rotation speed of the transfer roller.

[0013] (3) Further, the inspection apparatus of the present invention is characterized by further including an elastic body provided at the tip of the head portion and a guide roller provided at the tip of the elastic body. This makes it possible to bring the head portion into contact with the surface of the structure perpendicularly. Further, the elastic body provided at the tip of the head portion prevents the head portion from contacting the surface of the structure.

[0014] (4) Further, the inspection device of the present invention is characterized in that the head portion and the drive device are connected by a universal joint. Thereby, it becomes possible to bring the head portion having a support shaft for rotating the support shaft and the rolling element into contact perpendicularly to the surface of the structure.

[0015] (5) Further, the inspection device of the present invention uses the distance between the foot of the perpendicular line dropped from the head portion to the surface of the structure and the contact point where the rolling element contacts the surface of the structure as the support shaft radius, and each of the rolling elements has the same length of the support shaft radius, and is provided at a position where it rolls on the same circumference of the surface of the structure. Thereby, it becomes possible to inspect the surfaces of a wide range of structures at once.

[0016] (6) Further, the inspection device of the present invention uses the distance between the foot of the perpendicular line dropped from the head portion to the surface of the structure and the contact point where the rolling element contacts the surface of the structure as the support shaft radius, and each of the rolling elements has different lengths of the support shaft radius, and is provided at a position where it rolls on different circumferences of the surface of the structure. Thereby, it is possible to strike not only the outer periphery but also the inside of the rolling element, and it becomes possible to inspect the surfaces of a wider range of structures at once.

[0017] (7) Further, the inspection device of the present invention is characterized in that the cross-sectional shape of the plurality of rolling elements is a regular polygon, and is provided at the tip of the support shaft so that the contact line contacting the surface of the structure contacts the surface of the structure at the same timing as other rolling elements. Thereby, it becomes easier to notice changes in the impact sound.

[0018] (8) Further, the inspection device of the present invention is characterized in that the cross-sectional shape of the plurality of rolling elements is a regular polygon, and is provided at the tip of the support shaft so that the contact line contacting the surface of the structure contacts the surface of the structure at a different timing from other rolling elements. Thereby, the overlap of the impact sounds of the plurality of rolling elements is eliminated, and it becomes easier to identify the positions where the impact sounds are different.

[0019] (9) Further, the inspection device of the present invention is characterized in that the cross-sectional shape of the transfer roller is an irregular polygon. This makes it easier to identify positions where the impact sound is different.

[0020] (10) Also, the inspection device of the present invention is characterized in that the transfer roller has a hollow portion. Thereby, a reverberation effect can be obtained, and it becomes possible to make the impact sound louder and clearer. As a result, in addition to the low-frequency impact sound, it becomes easier to acquire a high-frequency sharp impact sound.

[0021] (11) Further, the inspection device of the present invention is characterized in that the outer peripheral surface and the interior of the transfer roller are formed of different materials. Thereby, for example, by using a material that can withstand wear by impact on the outer peripheral surface and a light material inside, it becomes possible to reduce the weight of the inspection device. Also, by using a material softer than metal, such as resin, etc. on the outer peripheral surface and a heavy metal material, etc. inside, when inspecting white outer wall tiles, etc., it is possible to suppress scratches and adhesion of metal wear pieces caused by contact of the transfer roller with the tiles.

[0022] (12) Further, the inspection method of the present invention is an inspection method using the inspection device according to any one of (1) to (11), and includes a step of bringing the transfer roller into contact with the surface of the structure, and a step of rotating the transfer roller by the drive device at a circumferential speed of 0.1 m / s or more and 1.1 m / s or less. Thereby, it becomes possible to rotate the support shaft at a low speed. As a result, each transfer roller rotates while being in contact with the surface of the structure without idling, and it is possible to suppress skipped sounds, strike without leaking to the surface of the structure, and improve the accuracy of inspection.

Advantages of the Invention

[0023] According to the present invention, wear of the transfer roller is suppressed, enabling long-term use.

Brief Description of the Drawings

[0024]

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Embodiments for Carrying Out the Invention

[0025] (First Embodiment) Next, embodiments of the present invention will be described with reference to the drawings. To facilitate understanding of the description, the same reference numerals are assigned to the same components in each drawing, and redundant descriptions are omitted.

[0026] As shown in FIG. 1, the inspection device S1 includes a plurality (three in the illustrated example) of transfer parts 10, a drive device 20, a telescopic rod 30 as a support means, and a power source 40. Each transfer part 10 includes a support shaft 11 and a transfer element 12. The support shaft 11 is attached to a rotating member provided on the outer peripheral surface of the head part. The transfer element 12 is rotatably supported at the tip of the support shaft 11.

[0027] The configuration of the transfer part 10 will be described in detail. As shown in FIGS. 2 and 3, a male screw member 13 is rotatably fitted around the outer periphery of the tip of the support shaft 11, and a female screw hole 14 of the transfer element 12 is screwed around the male screw member 13. A stopper 15 for preventing detachment is attached to the tip of the support shaft 11. Thereby, the transfer element 12 is rotatably supported at the tip of the support shaft 11.

[0028] The diameter of the transfer element 12 is about 25 mm. As shown in FIGS. 3 and 4, the transfer element 12 is formed into a polyhedron having a regular hexagonal cross-sectional shape and a substantially circular or substantially elliptical longitudinal cross-sectional shape. Note that FIG. 4 is a view in the direction of the X arrow of FIG. 3(b). The cross-section is a cross-section perpendicular to the support shaft 11, and the longitudinal cross-section is a cross-section parallel to the support shaft 11. Six transfer surfaces 12a and corner portions 12b are formed on the outer peripheral surface of the transfer element 12.

[0029] As shown in FIGS. 4 and 5, by rolling the rolling element 12 around the rotation center axis O with respect to the wall surface (also referred to as the surface) 1 of the structure, it becomes possible to clearly identify the presence or absence of abnormalities such as peeling, deterioration, swelling, air and foreign matter intrusion, etc. based on the rolling sound of the rolling surface 12a of the rolling element 12 against the wall surface 1. The rolling element 12 rolls without leaving the wall surface 1, and the corners 12b, 12b,... of the outer peripheral surface of the rolling element 12 serve as fulcrums due to the frictional locking force between the rolling element 12 and the wall surface 1. Since the cross-sectional outer shape of the rolling element 12 shown in FIG. 5 is a regular hexagon, every time it rotates approximately 60 degrees, the rolling surfaces 12a, 12a,... come into contact with the wall surface and produce a striking sound. While the striking sound makes one full rotation around the support axis, the six rolling surfaces come into contact with the wall surface one after another, and six striking sounds are generated at approximately equal intervals.

[0030] Each rolling element 12 may be provided at the tip of the support shaft 11 such that the rolling surface 12a or the corner (contact line) 12b that contacts the wall surface 1 of the structure or the like contacts the wall surface 1 of the structure or the like at the same timing as other rolling elements. For example, in the inspection device S1 shown in FIG. 1, the rolling surfaces 12a and the corners 12b of each of the three rolling elements 12 can be installed at the tips of the respective support shafts 11 so as to strike the wall surface 1 of the structure or the like at the same timing. In that case, the striking sound is generated at the same timing. As a result, since the striking sound becomes louder, it becomes easier to notice changes in the striking sound.

[0031] Also, each rolling element 12 may be provided at the tip of the support shaft 11 such that the rolling surface 12a or the corner (contact line) 12b that contacts the surface of the structure or the like contacts the surface of the structure or the like at a different timing from other rolling elements. For example, in the inspection device S1 shown in FIG. 1, a configuration is possible in which the rolling surfaces 12a and the corners 12b of each of the three rolling elements 12 contact the surface of the structure or the like at different timings. For example, when the three rolling elements 12 are installed at the tips of the respective support shafts 11 with their angles shifted by 20 degrees with respect to the support shaft 11, there is no overlap of the striking sounds of the plurality of rolling elements. Then, the striking sound continues to ring at short intervals, and it becomes possible to identify the position where the striking sound is different, that is, the position where deterioration or the like has occurred.

[0032] When the cross-sectional shape of the impact roller 12 is an equilateral triangle, a square, or a rectangle, the inner angles of the corners are acute or right angles, making it difficult to smoothly rotate the impact roller 12 with the corners as fulcrums. As a result, there is a possibility that the impact roller 12 may slide on the surface of the structure or the like without rotating. Therefore, the cross-sectional shape of the impact roller 12 is preferably a regular polygon from a regular pentagon to a regular dodecagon, more preferably a regular polygon from a regular pentagon to a regular octagon, but is not limited to regular polygons.

[0033] Furthermore, for example, the cross-sectional shape of the impact roller 12 may be a scalene polygon having an inscribed polygon of the same size in a circle. FIG. 6 is a diagram showing a first modification example of the impact roller 12. When an impact roller having a scalene polygon cross-sectional shape as shown in FIG. 6(a) and having an inscribed polygon of the same size in a circle with a regular polygon cross-sectional shape as shown in FIG. 6(b) is used, the corners 12b of each impact roller contact the wall surface at different timings. As a result, there is no overlap of the impact sounds, and it becomes possible to specify the positions where the impact sounds are different, that is, the positions where defects have occurred due to deterioration or the like.

[0034] The inspection device S1 determines the presence or absence of peeling or other parts of dense materials, that is, cement-based materials such as mortar, and outer wall tiles such as pottery, ceramics, and hard plastics, based on the reverberation sound generated from the wall surface when the wall surface 1 of the structure is struck with the impact roller. Since the impact roller 12 constantly contacts the hard wall surface, its wear is inevitable. However, by forming the impact roller 12 using a material having a Rockwell hardness of 40 or more, it becomes possible to suppress the wear of the impact roller 12. The material is preferably a metal such as stainless steel, but is not limited to metals. For example, materials such as ceramics, plastics, or resins may be used.

[0035] In addition, the outer peripheral surface and the interior of the transfer striker 12 may have a two-layer structure using different materials. For example, a material having a Rockwell hardness of 40 or more, which can withstand wear due to impact, is used for the outer peripheral surface, and a light material is used for the interior, so that the weight of the inspection device can be reduced. Further, by using a material softer than metal, such as resin, etc., for the outer peripheral surface and a metal material with a high specific gravity, etc., for the interior, when inspecting a white outer wall tile, etc., scratches caused by the contact of the transfer striker with the tile and the adhesion of metal wear pieces can be suppressed.

[0036] In the inspection device S1 of the present embodiment, since the transfer surface of the transfer striker is a cylindrical surface or an elliptical cylindrical surface, when the transfer striker rolls, the transfer surface makes line contact with the wall surface and emits a striking sound. Because it is line contact, for example, compared with the case where the transfer striker has a shape like a hexagonal nut and the entire transfer surface is in contact (surface contact), the contact pressure becomes much larger. Therefore, even if the transfer striker is small or the pressure applied by the transfer striker to the wall surface is weak, a large striking sound can be emitted. Further, even if the rotation center axis O of the transfer striker 12 is slightly inclined with respect to the wall surface, a striking sound can be obtained. Also, the sound of each transfer striker may be changed by changing the material or making it hollow.

[0037] FIG. 7 is a diagram showing a second modification example of the transfer striker 12. The transfer striker 12 may have a hollow portion 72 with one opening. The striking sound by the transfer striker is easier to hear if it continues ringing. However, when the cross-sectional shape is changed from a regular nonagon to a regular dodecagon, the rotational speed between the transfer surfaces becomes small (less than 45 degrees). Therefore, compared with the transfer striker having a shape from a regular pentagon to a regular octagon, it is difficult to obtain a desired striking sound. Therefore, by adopting a structure in which the transfer striker 12 has a hollow portion 72 with a substantially U-shaped cross section, the reverberation sound of the striking sound is made to reverberate in the hollow portion 72, and a larger and clearer striking sound can be obtained.

[0038] Figures 8 to 11 are diagrams showing the main part of the inspection device S1. As shown in FIGS. 8(a) and 8(b), each support shaft 11 of the transfer part 10 is radially attached obliquely forward so as to be spaced apart from each other toward the wall surface 1 of the structure from the rotating member provided on the outer peripheral surface of the head part 16. Further, it is more preferable that the support shafts 11 are provided at equal intervals. Each transfer roller 12 is in contact with the wall surface of the structure at the same inclination angle. With such a configuration, when the head part 16 rotates, the transfer roller 12 rotatably supported at the tip of each support shaft 11 continuously transfers onto the wall surface 1 of the structure. In the present embodiment, as shown in FIG. 8(a), an inspection device in which a support member 25 is fixed to the lower surface of the case body 21 will be described. However, as shown in FIG. 8(b), the lower end hook 27a of the suspension string 27 may be hooked via a spring 28. In that case, the cord 24 can be integrally handled by being wound around the suspension string 27 in the middle. Further, in order to bring the inspection device into close contact with the wall surface 1, a weight 29 may be attached to the rear of the case body 21 so that the center of gravity is at the rear.

[0039] The support shaft 11 is formed of a material and a cross-sectional shape having a flexural rigidity of 750 kN / cm or more. If the flexural rigidity is less than 750 kN / cm, the inspection device cannot withstand the pressure applied to the structure or the like, and the head part 16 will contact the wall surface of the structure or the like. Further, if the flexural rigidity is greater than 100 MN / cm, the followability of the transfer roller to the wall surface cannot be ensured. By forming the support shaft 11 of a material and a cross-sectional shape having a flexural rigidity of 750 kN / cm or more, it is possible to suppress the shaft from wobbling and withstand the pressure of pressing the inspection device against the structure or the like. As a result, it is possible to suppress the head part 16 from contacting the structure or the like and ensure the followability of the transfer roller to the wall surface.

[0040] Table 1 shows the results of determining the presence or absence of shaft wobbling and the presence or absence of contact of the head part with the wall surface using inspection devices configured by changing the material and cross-sectional shape of the support shaft. For example, it can be seen that even a material with low flexural rigidity such as resin can suppress shaft wobbling and contact of the head part with the wall surface by making the cross-section square.

[0041]

Table 1

[0042] Furthermore, as shown in FIG. 9, the distance between the foot of the perpendicular line dropped from the center of the head portion to the surface of the structure and the contact point where the rolling element contacts the wall surface of the structure is defined as the support shaft radius R. The support shaft radius R is preferably 50 mm or more and 250 mm or less. The angle θ between the support shafts is preferably set such that it is 100 degrees or more and 170 degrees or less.

[0043] If the support shaft radius R is larger than 250 mm, it becomes difficult to maintain the speed of the rolling element. If it is smaller than 50 mm, the range that can be inspected at one time becomes narrow. Also, if the angle θ between the support shafts is smaller than 100 degrees, it becomes difficult to maintain the speed of the rolling element. If it is larger than 170 degrees, the head portion 16 comes into contact with the structure or the like. By setting the support shaft radius R to be 50 mm or more and 250 mm or less, and the angle θ between the support shafts to be 100 degrees or more and 170 degrees or less, it becomes possible to widen the range that can be inspected at one time without the operating device coming into contact with the structure or the like while maintaining the rotational speed of the rolling element.

[0044] Further, the head portion 16 is supported at the tip of the drive device 20. The drive device 20 includes a case body 21, a drive motor 22 attached to the case body 21, and a speed reduction mechanism 23 built into the case body 21. A worm gear 22b is provided at the tip of the drive shaft 22a of the drive motor 22. The speed reduction mechanism 23 includes a first gear 23A meshing with the worm gear 22b, a second gear 23B directly connected to the first gear 23A, a large-diameter third gear 23C meshing with the second gear 23B, a small-diameter fourth gear 23D directly connected to the third gear 23C, and a fifth gear 23E meshing with the fourth gear 23D. A rotating shaft 16a inserted inside the head portion 16 is directly connected to the fifth gear 23E. Further, the rotating shaft 16a is connected to a rotating member provided on the outer peripheral surface of the head portion 16. A cord 24 connected to the power source 40 extends from the drive motor 22. Thus, the rotational driving force from the drive motor 22 is decelerated through the speed reduction mechanism 23 and transmitted to the rotating shaft 16a of the head portion 16 and the rotating member provided on the outer peripheral surface of the head portion 16, so as to rotate each transfer portion 10 at a low speed. Each transfer roller preferably rotates at a rotational speed of 20 to 40 rpm (circumferential speed of 0.1 m / s to 1.1 m / s). Thereby, each transfer roller can rotate while contacting the surface of a structure or the like without idling, suppress skipping of sound, strike the surface of a structure or the like without leakage, and improve the accuracy of inspection.

[0045] The case body 21 has a compact external dimension, and a support member 25 is fixed to the lower surface thereof. The support member 25 is fixed to the upper end of the uppermost stage portion 30A of the telescopic rod 30. Thereby, the drive device 20 is placed on the upper end of the uppermost stage portion 30A of the telescopic rod 30 via the support member 25. The telescopic rod 30 includes a plurality of stage portions, and the second stage portion and subsequent stage portions can be pulled out from the lowermost stage portion to extend the whole, or the second stage portion and subsequent stage portions can be retracted into the lowermost stage portion to reduce the whole.

[0046] As shown in FIG. 10, the inspection device S1 may further include an elastic body 71 such as a spring at the tip of the head portion 16 (on the extension of the rotation axis), and a guide roller 73 at the tip of the elastic body 71. By providing the guide roller 73, it becomes possible to bring the transfer roller 12 into contact with the wall surface 1 while maintaining the head portion 16 having the support shaft 11 that rotates the support shaft 11 and the transfer roller 12 in a posture perpendicular to the wall surface 1 of a structure or the like. In addition, by providing the elastic body 71 at the tip of the head portion 16, it is possible to prevent the head portion 16 from contacting the wall surface of a structure or the like.

[0047] As shown in FIG. 11, in the inspection device S1, the head portion 16 and the drive device 20 may be coupled by a universal joint 75. It becomes possible to bring the transfer roller 12 into contact with the wall surface 1 while maintaining the support shaft 11 and the head portion 16 in a posture perpendicular to the wall surface 1 of a structure or the like.

[0048] FIG. 12 is a diagram showing a modified example of the transfer portion 10. As shown in FIG. 12(a), the transfer portion 10 may have a configuration in which each support shaft radius R has the same length and each transfer roller 12 is provided at a position where it rolls on the same circumference of the wall surface of a structure or the like. By adopting such a configuration, it becomes possible to inspect the surfaces of a wide range of structures or the like at once.

[0049] Further, as shown in FIGS. 12(b) and (c), the transfer portion 10 may have a configuration in which each support shaft radius R has a different length and each transfer roller 12 is provided at a position where it rolls on different circumferences on the surface of the structure. By adopting such a configuration, it is possible to strike even the inside of the outermost transfer roller, and it becomes possible to inspect the surfaces of a wider range of structures or the like at once.

[0050] Figs. 13(a) and (b) are diagrams showing modified examples of the shape of the support shaft 11. When placing the rolling elements on different circumferences as shown in Figs. 12(b) and (c), it is necessary to consider the structure of the support shaft 11 so that the rolling elements 12 contact the wall surface 1 of a structure or the like at the same inclination angle. Therefore, the support shaft 11 may have a structure that curves as shown in Fig. 13(a), for example, when the rolling element 12 is brought into contact with the wall surface 1 while maintaining the head portion 16 in a posture perpendicular to the wall surface 1. Further, the support shaft 11 may be provided with a movable member 77 such as a universal joint as shown in Fig. 13(b), and may have a structure that bends so that the rolling elements 12 contact the wall surface 1 of a structure or the like at the same inclination angle. If a joint is provided, it is possible to cope even when the support shaft diameters are different.

[0051] Since each rolling part 10 can be stably rotated when the center of gravity coincides with the rotation axis 16a, it is more preferable that the rolling elements 12 are evenly arranged as shown in Figs. 12(a) and (b).

[0052] Fig. 14 shows a state in which the wall surface 1 of the structure T is being inspected using the inspection device S1. The length of the telescopic rod 30 is adjusted according to the height of the inspection location on the wall surface 1. When the telescopic rod 30 is held by hand and the switch 26 provided in the middle of the cord 24 is turned on, each rolling part 10 at the tip of the telescopic rod 30 moves slowly around the rotation axis 16a in the head part 16 with the rotation axis 16a as the central axis. Each rolling part 10 revolves slowly around the rotation axis 16a of the head part 16 while the rolling element 12 rotates by itself. In this way, it is possible to inspect the presence or absence of peeling or the like at the inspection location based on the rolling sound of each rolling element 12 that rolls around the rotation axis 16a. When there are a plurality of rolling elements, or when rolling elements with different reverberation sounds are used, it is possible to easily determine the presence or absence of peeling and identify the rolling elements by using an acoustic analysis device.

[0053] (Second Embodiment) Figs. 15 to 19 are diagrams showing the second embodiment. As shown in Figs. 15 to 17, the inspection device S2 includes a plurality (four in the illustrated example) of rolling parts 10, a drive device 50, a suspension cord 60 as a support means, and a power source 70.

[0054] Each transfer part 10 includes a support shaft 11 attached around the head part 16 and a transfer roller 12 rotatably supported at the tip of the support shaft 11, similar to the inspection device S1. When the head part 16 rotates, the transfer roller 12 at the tip of each support shaft 11 is configured to continuously transfer to the wall surface 1 of the structure. The head part 16 is rotatably supported at the tip of the drive device 50.

[0055] The drive device 50 includes a case body 51, a drive motor 52 built into the case body 51, and a speed reduction mechanism 53 built into the case body 51. The rotational driving force of the drive motor 52 is transmitted from the worm gear 52a to the speed reduction mechanism 53 and further transmitted from the speed reduction mechanism 53 to the rotation shaft 16a of the head part 16. A cord 54 connected to the power source 70 extends from the drive motor 52. Thereby, the rotational driving force from the drive motor 52 is reduced via the speed reduction mechanism 53 and transmitted to the rotation shaft 16a of the head part 16, and each transfer part 10 is rotated at a low speed. A string suspension part 55 is provided on the upper surface of the case body 51. The string suspension part 55 is composed of a fixing plate 55a fixed to the upper surface of the case body 51 and a hook 55b locked to the fixing plate 55a, and the lower end hook 60a of the suspension string 60 is hooked to the hook 55b via a spring 61. Note that the cord 54 can be integrally handled by being wound around the suspension string 60 in the middle.

[0056] An attachment member 81 is provided on the front surface of the case body 51, and stabilizing bars 82, 82 that protrude from the front surface of the case body 51 to both the left and right sides are attached to the attachment member 81. Each stabilizing bar 82 serves to stably abut the transfer roller 12 against the wall surface 1 of the structure T. It extends horizontally from the attachment member 81 to the left and right, and each has a bent portion 82a that bends midway and gradually approaches the wall surface 1 toward the tip. The tips of the left and right bent portions 82a are each bent downward to form a support portion 82b. A guide roller 83 that closely adheres to the wall surface 1 of the structure T is rotatably supported on each support portion 82b. By the action of these left and right guide rollers 83, 83 and the stabilizing bars 82, 82, the transfer roller 12 in front of the head portion 16 can be stably abutted against the wall surface 1 of the structure T.

[0057] A rotary fan mounting plate 85 is attached to the back surface of the case body 51 via left and right attachment members 84. An opening 85a is provided in the rotary fan mounting plate 85, and a fan case body 86a containing a rotary fan 86 is attached to the back surface of the rotary fan mounting plate 85 so that the rotary fan 86 is positioned in the opening 85a. The rotational driving force from the drive motor 52 in FIG. 9 is transmitted to the rotation axis 86b of the rotary fan 86. Then, by the rotational drive of the rotary fan 86, an air flow F is formed from the inside of the rotary fan mounting plate 85, that is, from the side of the wall surface 1 of the structure T to the outside of the rotary fan mounting plate 85. As a result, the inside of the rotary fan mounting plate 85 tends to be under negative pressure, serving to stably abut the transfer roller 12 in front of the head portion 16 against the wall surface 1 of the structure T.

[0058] On both sides of the rotary fan mounting plate 85, wind pressure plates 87, 87 are attached. As shown in Fig. 17, such wind pressure plates 87, 87 are provided in a bent shape so as to approach the wall surface 1 of the structure T as they move away from the rotary fan mounting plate 85 to the left and right. Thereby, the wind pressure plate 87 receives the wind pressure W from the lateral direction, and serves to stably abut the rolling element 12 in front of the head portion 16 against the wall surface 1 of the structure T. In order to stabilize the rolling element 12 in front of the head portion 16 against the wall surface 1 of the structure T, instead of the rotary fan 86, for example, as shown in Fig. 18, a weight 79 may be attached to the lower part of the drive device to stabilize it.

[0059] Fig. 19 shows a state in which the wall surface 1 of the structure T is being inspected from the roof using the inspection device S2. Depending on the height of the structure T, it is assumed that the inspection location may not be reached by the inspection device S1 in Fig. 1. In such a case, the inspection device S2 is slowly lowered from the roof 2 of the structure T by the suspension string 60, and as shown in Fig. 19, the inspection is carried out while slowly moving the inspection device S2 from bottom to top while swinging it left and right in the manner of a pendulum (movement locus L). At the time of inspection, a switch (not shown) at hand is turned on to rotationally drive the drive motor 52, whereby the rolling element 12 is slowly moved around the rotation axis 16a of the head portion 16 on the front surface of the drive device 50, and at the same time, the rotary fan 86 is rotated.

[0060] Due to the rotation of the rotary fan 86, the inside of the rotary fan mounting plate 85 tends to be in a negative pressure state, and each rolling element 12 is moderately pressed against the wall surface 1 of the structure T by the wind pressure. At the same time, each rolling element 12 is stably abutted against the wall surface 1 of the structure T by the stabilizing action of the left and right guide rollers 83 and the stabilizing bar 82. In such a stable abutting state, each rolling element 12 rolls slowly around the rotation axis 16a of the head portion 16, and the presence or absence of peeling or the like at the inspection location can be clearly identified and inspected by the rolling sound emitted from each rolling element 12.

[0061] In addition, when there is a crosswind, it is assumed that the driving device 50 suspended by the suspension string 60 sways left and right or back and forth under the wind pressure W of the crosswind, and the contact posture and contact state of each rolling element 12 become unstable during inspection. However, by providing the wind pressure plates 87, 87, it can be used as a means to stabilize the wind pressure W from the crosswind. Here, the above-described stabilizer bar 82, guide roller 83, rotary fan 86, and wind pressure plate 87 constitute a stabilizing means for stabilizing the position of the driving device 50 with respect to the wall surface 1 during inspection and always stabilizing the rolling impact by the rolling elements 12.

[0062] When rolling the rolling element 12, since the operator does not swing or move the hand holding the suspension string 60 left and right or up and down, the load on the operator can be greatly reduced compared to the prior art. By always generating a stable rolling impact sound by the above-described stabilizing means, the inspection work can be efficiently and widely performed.

[0063] By swinging the inspection device S2 suspended by the suspension string 60 left and right in a pendulum manner, the inspection work on the wall surface 1 can be quickly and stably carried out. That is, by swinging the inspection device S2 left and right in the manner of a pendulum, the inspection device S2 during inspection (inspection range A) by each rolling element 12 can be smoothly moved left and right. Also, at that time, since the inspection device S2 is always stably pressed against the wall surface 1 by the wind pressure of the rotary fan 86, the moving speed of the inspection device S2 can be increased to speed up the efficiency of the inspection work.

[0064] As described above, according to the present embodiment, wear of the rolling element is suppressed, and long-term use is enabled.

Explanation of Reference Numerals

[0065] 1 Wall surface (surface) 2 Roof 10 Rolling part 11 Support shaft 12 Rolling element 12a Rolling surface 12b Corner part 13 Male screw member 14 Female screw hole 15 Stopper 16 Head part 16a, 86b Rotation axis 20, 50 Driving device 21, 51 Case body 22, 52 Driving motor 22a Driving shaft 22b, 52a Worm gear 23, 53 Reduction mechanism 23A First gear 23B Second gear 23C Third gear 23D Fourth gear 23E Fifth gear 24, 54 Cord 25 Support member 27 Suspension cord 27a Hook 28 Spring 29 Weight 30 Telescopic oar (support means) 30A Topmost part 40 Power supply 55 Cord suspension part 55a Fixing plate 55b, 60a Hook 60 Cord suspension part (support means) 61 Spring 70 Power supply 71 Elastic body 72 Hollow part 73 Guide roller 75 Universal joint 77 Movable member 79 Weight 81, 84 Mounting member 82 Stabilizing bar 82a Bending part 82b Support part 83 Guide roller 85 Rotating fan mounting plate 85a Opening 86 Rotating fan 86a Fan case body 87 Wind pressure plate A Inspection range by transfer ball T Structure Moving locus of inspection device by pendulum method F Air flow W Wind pressure

Claims

1. An inspection device used for percussion inspection of the wall surface of a structure, comprising: a plurality of support shafts provided around the head portion; rolling strikers rotatably supported at the tips of the respective support shafts and rolling while contacting the surface of the structure; a driving device for supporting and rotating the head portion; a support portion for holding or moving the driving device at a desired height with respect to the structure, each of the rolling strikers is composed of a polyhedron having a cross-sectional outer shape of a polygon with 5 to 12 sides and opposing sides with a longitudinal cross-sectional outer shape of an arc or an elliptical arc; the rolling striker is characterized in that one of them is open and has a hollow portion with a substantially U-shaped cross section.

2. Each of the support shafts is formed of a material and a cross-sectional shape with a bending rigidity of 750 kN / cm or more, and is provided radially from a rotating member provided on the outer peripheral surface of the head portion so that the angle between the support shafts is 100 degrees or more and 170 degrees or less. The distance between the foot of the perpendicular dropped from the head portion to the surface of the structure and the contact point where the rolling striker contacts the surface of the structure is defined as the support shaft radius, and the support shaft radius is 50 mm or more and 250 mm or less. The inspection device according to claim 1, wherein each of the rolling strikers contacts the surface of the structure at the same inclination angle.

3. an elastic body provided at the tip of the head portion; a guide roller provided at the tip of the elastic body, and the inspection device according to claim 1 or claim 2, further comprising the same.

4. The inspection device according to any one of claims 1 to 3, wherein the head portion and the driving device are coupled by a universal joint.

5. The distance between the foot of the perpendicular dropped from the head portion to the surface of the structure and the contact point where the rolling striker contacts the surface of the structure is defined as the support shaft radius. Each of the rolling strikers has the same length of the support shaft radius and is provided at a position where it rolls on the same circumference of the surface of the structure. The inspection device according to any one of claims 1 to 4, characterized in that.

6. The distance between the foot of the perpendicular dropped from the head portion to the surface of the structure and the contact point where the rolling striker contacts the surface of the structure is defined as the support shaft radius. Each of the rolling strikers has a different length of the support shaft radius and is provided at a position where it rolls on different circumferences of the surface of the structure. The inspection device according to any one of claims 1 to 4, characterized in that.

7. The cross-sectional shape of the plurality of transfer pins is a regular polygon, and it is provided at the tip of the support shaft so that the contact line contacting the surface of the structure contacts the surface of the structure at the same timing as other transfer pins. The inspection device according to any one of claims 1 to 6, characterized in that.

8. The cross-sectional shape of the plurality of transfer pins is a regular polygon, and it is provided at the tip of the support shaft so that the contact line contacting the surface of the structure contacts the surface of the structure at a timing different from that of other transfer pins. The inspection device according to any one of claims 1 to 6, characterized in that.

9. The cross-sectional shape of the transfer pin is a scalene polygon. The inspection device according to any one of claims 1 to 6, characterized in that.

10. The outer peripheral surface and the inside of the transfer pin are formed of different materials. The inspection device according to any one of claims 1 to 9, characterized in that.

11. An inspection method using the inspection device according to any one of claims 1 to 10, A step of bringing the transfer pin into contact with the surface of the structure, A step in which the drive device rotates the transfer pin at a circumferential speed of 0.1 m / s or more and 1.1 m / s or less. An inspection method characterized by including.

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