JP5997948B2 - Method for investigating surface degradation of narrow part between structures and apparatus therefor - Google Patents

Description

  The present invention relates to a method for investigating narrow surface degradation between structures and an apparatus therefor.

  Conventionally, visual inspection of surface deterioration has been performed in the maintenance of structures. However, for example, in narrow spaces where multiple structures are close, such as between houses in densely populated areas, between houses and outer walls, between machinery and equipment and walls, and at the ends of bridge superstructures. , People may not be able to enter directly. In such a case, it is difficult to investigate the surface deterioration of the narrow portion by visual observation.

  Here, deterioration factors such as moisture, salt, earth and sand, and dust are likely to enter the narrow portion and accumulate on the surface of the structure or inside the structure. There is a problem that deterioration and damage such as peeling are concerned.

  For example, in a narrow portion formed between a girder end of a concrete bridge superstructure and an abutment parapet or a narrow portion formed between opposed girder ends (hereinafter, these narrow portions are referred to as girder narrow portions). A large number of cases of complex deterioration due to salt damage, frost damage, etc. due to the action of water leakage including anti-freezing agents due to the expansion device installed at the upper part of the narrow end of the girders and the poor water stoppage of the ground cover. Has been.

  In addition, in the prestressed concrete bridge superstructure, the fixing member of the tension member is arranged in the narrow part of the girder end, and the fixing member is made of steel, so the corrosion of the fixing member due to salt damage occurs, and the tension member due to deterioration of the fixing member. There is a risk of deterioration of the structure due to reduction of prestress and corrosion of the fixing body. Tensile anchoring performance is important for maintaining the prestress introduced in the structure, and maintaining prestress is important for maintaining the function of the entire structure. It can be said that this is an important part for functional preservation.

  As a method for repairing the girder narrow part, a method is disclosed in which the concrete of the end surface of the girder narrow part is suspended by spraying a water jet from the nozzle of the suspension device inserted in the narrow part of the girder, and the suspended surface is repaired. (For example, refer to Patent Document 1).

  In addition, as a structure to prevent leakage of water into the narrow end of the girder, a water stop that extends in the width direction of the bridge girder on the lower side of the road joint of the narrow end of the girder is in a full position. A bridge girder water stop structure in close contact with the opposite end surface of the girder narrow portion is disclosed (for example, see Patent Document 2).

  In addition, as a technique for preventing the deterioration of the narrow ends of the girders, a compound for foamed polyurethane mainly comprising at least one polyol selected from the group consisting of polybutadiene polyol, polyether polyol, polyester polyol and polycarbonate polyol and diisocyanate. And a waterproofing method in which a waterproofing composition for the end surfaces of a concrete or steel structure comprising a foaming agent is coated and foamed on the end surfaces of these structures (for example, patent documents) 3).

Japanese Patent Laid-Open No. 2007-218048 JP 2008-095299 A JP 2006-298970 A

  For example, as in Patent Document 1 described above, although the repair method of the narrow end of the spar is known, the width of the narrow end of the spar is narrow in the direction of the bridge axis, and a person directly enters the narrow end of the spar and deteriorates the situation. It is difficult to confirm in advance.

  Further, for example, as disclosed in Patent Document 2 and Patent Document 3 described above, many techniques for countermeasures against deterioration of structures have been disclosed, but an effective method for investigating surface deterioration of structures under special conditions such as narrow portions. Is not known. More specifically, although it has been practiced to insert a video scope from one end of the narrow section into the narrow section and take an image of the surface of the structure, this survey method cannot accurately identify the shooting location, It was difficult to grasp the deterioration status.

  Therefore, in the repair method disclosed in Patent Document 1, which is performed in a situation where it is difficult to accurately grasp the deterioration state, there is a risk that a part that does not require repair may be suspended or a part that requires repair is not repaired. Since repair may be necessary, there is a problem that it may become uneconomical depending on the deterioration state or the repair state.

  In view of the above circumstances, an object of the present invention is to provide a method for investigating the surface deterioration of a narrow part between structures and an apparatus for the same, which can accurately grasp the surface deterioration state of the narrow part between the structures. .

Constriction surface deterioration inspection device between the structure of the present invention to achieve the above Symbol object,
A movable body frame movable in the X direction along the surface of the narrow structure between the structures;
A Y-direction moving piece attached to the moving body frame;
A scope in which the tip is attached to the Y-direction moving piece and the other end is coupled to the moving image photographing unit body;
An X-direction movement amount detection unit for detecting an X-direction movement amount of the moving body frame;
Y-direction movement amount input means for inputting the Y-direction movement amount of the Y-direction movement piece;
A still image data generating unit that generates still image data of the surface of the structure from the X movement amount data and the Y direction movement amount data, and the two-dimensional moving image data recorded in the moving image photographing unit body;
It is provided with.

  Here, the “scope” in the present invention refers to, for example, a video scope or a fiber scope.

  The narrow surface degradation inspection device between structures according to the present invention is such that the moving body frame is movable in the X direction along the structure surface of the narrow portion between structures, and is attached to the moving body frame. Since the tip of the scope is attached to the Y-direction moving piece, according to the present invention, it is possible to investigate the surface deterioration of a narrow part that is difficult for a person to enter directly without the person entering the narrow part directly. It is. Further, the narrow surface degradation inspection device between structures of the present invention is a device that generates still image data from the X movement amount data, the Y direction movement amount data, and the two-dimensional moving image data. According to the present invention, an accurate shooting location can be specified based on the X movement amount data and the Y direction movement amount data, and the surface deterioration state of the narrow portion between the structures can be accurately grasped. In addition, according to the present invention, the parts that need repair are clarified before the repair is performed. Therefore, in subsequent repairs, parts that do not need to be repaired or parts that need repair are repaired without repair. It is possible to avoid the need for repairs and not to be uneconomical. Furthermore, according to the present invention, after the repair is performed, the effect of the repair that has been performed can be directly confirmed by capturing a two-dimensional moving image again and generating still image data.

  Here, the narrow surface degradation test apparatus between structures according to the present invention includes a distance holding member that prevents the moving body frame from falling and holds the distance between the moving body frame and the structure surface. It is preferable that

  According to the narrow surface degradation inspection apparatus between structures provided with such a distance holding member, since the photographing distance is maintained at a predetermined distance, still image data can be generated with high accuracy.

In addition, the narrow surface degradation inspection device between structures of the present invention,
“The narrow part is a narrow part formed between the girder end of the concrete bridge superstructure and the abutment parapet, or the narrow part formed between the opposite girder ends,
The movable body frame is movable in the X direction along the beam end of the narrow portion and the surface of the abutment parapet,
The still image data generation unit generates still image data of the end of the beam or the surface of the abutment parapet. ''
It is preferable.

As described above, in such a narrow part, there are many cases of complex deterioration due to salt damage, frost damage, etc. due to the action of water leakage including anti-freezing agents, but people have entered directly to check the deterioration situation in advance. It was difficult to confirm, and it was difficult to accurately grasp the deterioration state. However, according to such a preferable form, since the surface deterioration state of the narrow part can be accurately grasped, in subsequent repairs, parts that do not need repair or parts that need repair are included. It is possible to avoid the need for re-repair without being repaired, and there is no uneconomical situation.
Moreover, the narrow part surface deterioration investigation method between the structures of this invention which achieves the said objective attaches the front-end | tip of the scope of the narrow part surface deterioration investigation apparatus between the structures of any aspect of this invention. A moving body frame attached with a Y-direction moving piece is inserted into a narrow portion between structures, and a two-dimensional moving image of the surface of the structure in the narrow portion is photographed. Image data is generated.
According to the narrow surface degradation inspection method between structures of the present invention, it is possible to implement the surface degradation investigation of a narrow portion that is difficult for a person to enter directly without the person directly entering the narrow portion. In addition, according to the present invention, the method for investigating the surface degradation of the narrow portion between structures generates still image data from the position data and the two-dimensional moving image data. The shooting location can be specified, and the surface deterioration state of the narrow portion between the structures can be accurately grasped. In addition, according to the present invention, the parts that need repair are clarified before the repair is performed. Therefore, in subsequent repairs, parts that do not need to be repaired or parts that need repair are repaired without repair. It is possible to avoid the need for repairs and not to be uneconomical. Furthermore, according to the present invention, after the repair is performed, the effect of the repair that has been performed can be directly confirmed by capturing a two-dimensional moving image again and generating still image data.
Here, in the method for investigating the surface degradation of the narrow part between the structures of the present invention, the narrow part is a narrow part formed between the girder end of the concrete bridge superstructure and the abutment parapet, or between the opposite girder ends. It is preferable to apply to the narrow part formed in the above.
As described above, in such a narrow part, there are many cases of complex deterioration due to salt damage, frost damage, etc. due to the action of water leakage including anti-freezing agents, but people have entered directly to check the deterioration situation in advance. It was difficult to confirm, and it was difficult to accurately grasp the deterioration state. However, according to such a preferable form, since the surface deterioration state of the narrowed portion is accurately grasped, in the subsequent repair, a portion that does not need repair or a portion that requires repair is repaired. Therefore, it is possible to avoid the need for re-repair, without being uneconomical.

According to the narrow surface deterioration inspection apparatus between narrow structures between structures of the present invention and the narrow surface deterioration inspection method between structures using the apparatus, it is possible to accurately grasp the surface deterioration state of the narrow portions between structures.

It is a front view which shows one Embodiment about the narrow part surface deterioration investigation apparatus between the structures of this invention. It is a top view of the narrow part surface deterioration investigation apparatus shown in FIG. It is the figure which looked at the concrete bridge superstructure from the bridge axis direction.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a front view showing an embodiment of a narrow surface degradation inspection apparatus between structures according to the present invention. FIG. 2 is a plan view of the narrow surface degradation inspection apparatus shown in FIG. In FIG. 2, the illustration of the falling prevention wire 131 is omitted.

  1 and 2 is the X direction, and the vertical direction in FIG. 1 and the direction perpendicular to the paper surface in FIG. 2 is the Y direction.

  As shown in FIGS. 1 and 2, the narrow surface degradation inspection device 100 includes a moving body frame 110, a Y-direction moving piece 120, a fall prevention wire 131, a distance holding plate 132, and a moving body frame movement. An apparatus 140, a video scope 150, an X-direction movement amount detection unit 160, a Y-direction movement amount input unit 170, and a still image data generation unit 180 are provided.

  The moving body frame 110 is a frame that is movable in the X direction along the surface of the narrow structure between the structures. The moving body frame 110 connects two steel plates 111 and 112, which are arranged in the X direction with a space therebetween and each extend in the Y direction, and the two steel plates 111 and 112 and connects the moving body frame 110 to the moving body frame 110. It has a plurality of reinforcing plates 113 that secure rigidity and are arranged in the Y direction at intervals and each extend in the X direction. In addition, wheels 114 are provided below the two steel plates 111 and 112, respectively. A rail 200 extending in the X direction is provided below the moving body frame 110, and the wheels 114 are placed on the rail 200. Thereby, the movable body frame 110 is movable in the X direction. In addition, a pair of pulleys 115 and 116 adjacent to each other in the Y direction are provided on the upper portions of the two steel plates 111 and 112, respectively. The moving body frame 110 corresponds to an example of the moving body frame referred to in the present invention.

  The Y-direction moving piece 120 is a plate that is attached to the moving body frame 110 and extends in the X direction. The Y-direction moving piece 120 is composed of two plates, and is attached to the moving body frame 110 by sandwiching the two steel plates 111 and 112 of the moving body frame 110 and fastening them with bolts. The Y-direction moving piece 120 can change the position in the Y direction to a desired position by changing the position where the steel plates 111 and 112 are sandwiched. Further, the Y-direction moving piece 120 has an attachment portion 121 to which the distal end 151 of the video scope 150 is attached. The Y-direction moving piece 120 corresponds to an example of the Y-direction moving piece referred to in the present invention.

  The falling prevention wire 131 is a member that prevents the moving body frame 110 from falling and guides the movement of the moving body frame 110 in the X direction. The fall prevention wire 131 is stretched in the narrow portion in the X direction in a tensioned state, and both ends are fixed to the surface of the structure outside the narrow portion. In addition, in the portion of the wire 131 for falling prevention that is stretched in the X direction, the pair of pulleys 115 and 116 provided on the upper portions of the two steel plates 111 and 112 of the movable body frame 110 are passed.

  The distance holding plate 132 is a member that holds the distance between the moving body frame 110 and the structure surface. The distance holding plate 132 is provided on the upper and lower portions of the two steel plates 111 and 112 of the movable body frame 110 in a state of projecting in the direction intersecting the X direction and the Y direction.

  The combination of the fall prevention wire 131 and the distance holding plate 132 corresponds to an example of the distance holding member according to the present invention.

  The moving body frame moving device 140 is a device that moves the moving body frame 110 in the X direction. The moving body frame moving device 140 includes a belt 141 having an intermediate portion fixed to each of the two steel plates 111 and 112 of the moving body frame 110 and extending in the X direction within the narrowed portion, and narrowed portions on both sides of the narrowed portion. Two winding drums 1421 and 1422 that are provided outside both ends of the belt 141 and wind the belt 141 outside, and motors 1441 and 1442 that drive the winding drums 1421 and 1422 via the timing belt 143 are provided. Yes. The take-up drums 1421, 1422 are provided with handles 145 for manually taking up the belts 1421, 1422 in place of the take-up by the motors 1441, 1442. The winding drums 1421, 1422 and the motors 1441, 1442 are placed on steel stands 1461, 1462 fixed on structures outside the narrow portions on both sides with the narrow portions interposed therebetween. Further, a pipe 147 extending in the Y direction is fixed to one steel mount 1461, and a table 1471 that is movable in the Y direction is provided on the pipe 147.

  The video scope 150 is a flexible scope. The video scope 150 has an imaging element (not shown) that captures the surface of the narrow structure, at the tip 151, and this tip 151 is attached to the attachment portion 121 of the Y-direction moving piece 120. As a result, the distal end 151 of the video scope 150 moves following the movement of the moving body frame 110 in the X direction, and a two-dimensional moving image of the surface of the narrow structure is captured. Further, the other end 152 of the video scope 150 is coupled to the moving image photographing unit main body 300. Two-dimensional moving image data read from the image sensor is input and recorded in the moving image capturing unit main body 300. The video scope 150 corresponds to an example of a scope according to the present invention, and the moving image shooting unit main body 300 corresponds to an example of a moving image shooting unit main body according to the present invention.

  The X direction movement amount detection unit 160 detects the X direction movement amount of the moving body frame 110. The X-direction movement amount detection unit 160 is fixed outside the narrow portion. In the present embodiment, the X-direction movement amount detection unit 160 is fixed to the table 1471 provided on the pipe 147 described above. The X-direction movement amount detection unit 160 has a through hole 161, and the video scope 150 is passed through the through hole 161. Then, as the distal end 151 of the video scope 150 moves following the movement of the moving body frame 110 in the X direction, the video scope 150 that has passed through the through hole 161 of the X direction movement amount detection unit 160 penetrates. When passing through the hole 161, the passing amount is measured by the X-direction moving amount detection unit 160. Since this passing amount is equal to the moving amount of the moving body frame 110 in the X direction, measuring the passing amount by the X direction moving amount detecting unit 160 is equivalent to measuring the moving amount of the moving body frame 110 in the X direction. It is. That is, in this embodiment, the amount of movement of the moving body frame 110 is indirectly detected by measuring the amount of passage of the video scope 150 through the through-hole 161 by the X-direction movement amount detection unit 160. ing. The X direction movement amount detection unit 160 and the moving image photographing unit main body 300 are connected by a transmission cable 162 that transmits X movement amount data representing the X direction movement amount detected by the X direction movement amount detection unit 160. The X movement amount data is input to the moving image photographing unit main body 200 via the transmission cable 162 and recorded. The X-direction movement amount detection unit 160 corresponds to an example of the X-direction movement amount detection unit according to the present invention.

  The Y-direction movement amount input means 170 is for inputting the Y-direction movement amount of the Y-direction moving piece 120. The Y-direction movement amount input unit 170 is provided in the moving image photographing unit main body 300. The Y-direction movement amount input by the Y-direction movement amount input means 170 is recorded in the moving image photographing unit main body 300 as Y-direction movement amount data. The Y-direction movement amount input means 170 corresponds to an example of the Y-direction movement amount input means referred to in the present invention.

  The still image data generation unit 180 generates still image data on the surface of the structure from the X movement amount data and the Y direction movement amount data and the two-dimensional moving image data recorded in the moving image photographing unit main body 300. The still image data generation unit 180 corresponds to an example of the still image data generation unit referred to in the present invention.

  In the narrow surface degradation apparatus 100 of this embodiment, the moving body frame 110 is movable in the X direction along the structure surface of the narrow portion between structures, and is attached to the moving body frame 110. Since the distal end of the video scope 150 is attached to the Y-direction moving piece 120, it is possible to investigate the surface deterioration of a narrow part that is difficult for a person to enter directly without the person entering the narrow part directly.

  In addition, since the device for investigating surface degradation between narrow structures in this embodiment is an apparatus that generates still image data from X movement amount data, Y direction movement amount data, and two-dimensional moving image data, X An accurate shooting location can be specified based on the movement amount data and the Y direction movement amount data, and the surface degradation state of the narrow portion between the structures can be accurately grasped. Further, the narrow surface degradation inspection device 100 of the present embodiment includes the falling prevention wire 131 and the distance holding plate 132, so that the photographing distance is maintained at a predetermined distance and still image data is generated with high accuracy. Can do.

  In addition, according to the narrow surface degradation inspection apparatus 100 of the present embodiment, since the part that needs repair is clarified before the repair is performed, it is possible to connect a part that does not need repair or repair after that. It is possible to avoid the need for re-repairing without repairing the necessary part, and it is not uneconomical. Furthermore, according to the narrow surface degradation inspection apparatus 100 of the present embodiment, after the repair is performed, the effect of the repair that has been performed can be directly confirmed by taking a two-dimensional moving image again and generating still image data. it can.

  In the above-described embodiment, an example in which the scope according to the present invention is a video scope has been described. However, the scope according to the present invention is not limited to this, and may be a fiber scope, for example. .

  Above, description of one Embodiment about the narrow part surface deterioration investigation apparatus between the structures of this invention is complete | finished.

  Next, an embodiment of a method for investigating the narrow surface degradation between structures of the present invention will be described. In the present embodiment, a method for investigating the surface deterioration of a narrow part formed between a girder end of a concrete bridge superstructure and an abutment parapet will be described.

  FIG. 3 is a diagram of the concrete bridge superstructure as seen from the bridge axis direction.

  Hereinafter, a surface deterioration investigation method using the narrow surface deterioration inspection apparatus 100 described with reference to FIGS. 1 and 2 will be described with reference to FIGS.

  First, prior to the surface deterioration investigation of the narrow portion 600 formed between the beam end 410 of the concrete bridge superstructure 400 and the abutment parapet 510, the dust in the narrow portion 600 is removed and the narrow portion 600 is washed with water.

  Next, the narrow surface degradation device 100 is installed. More specifically, first, the rail 200 is laid on the abutment top end 520 in the narrow portion 600. Further, both ends of the fall prevention wire 131 are fixed to the surface of the abutment parapet 510 outside the narrow portion 600, and the fall prevention wire 131 is put in a tension state. Thereafter, the moving body frame moving device 140 is fixed on the abutment top end 520 outside the narrow portion 600. Further, the wheel 114 of the moving body frame 110 is placed on the rail 200 and the moving body frame 110 is inserted into the narrow portion 600, and the moving body frame 110 is movable in the X direction along the surface of the beam end 410 of the narrow portion 600. To do. At this time, the fall prevention wire 131 is passed between the pair of pulleys 115 and 116 of the movable body frame 110. In addition, the Y-direction moving piece 120 with the distal end 151 of the video scope 150 attached to the attachment portion 121 is fixed to a desired position of the moving body frame 110. Further, the Y-direction movement amount input means 170 inputs the Y-direction movement amount of the direction moving piece 120 and records it in the moving image photographing unit main body 300 as Y-direction movement amount data.

  By driving the motor 1441 and 1442 of the moving body frame moving device 140 for the moving body frame 110 in the narrow surface degradation apparatus 100 installed in this way, the X along the surface of the spar end 410 of the narrowing portion 600 While moving at a constant speed in the direction, the imaging element (not shown) at the tip 151 of the video scope 150 captures the surface of the spar end 410 of the narrow portion 600 and shoots a two-dimensional moving image of the surface. Then, the two-dimensional moving image data read from the image sensor is input to the moving image capturing unit main body 300 and recorded. In addition, the X direction movement amount of the moving body frame 110 is detected by the X direction movement amount detection unit 160, and X movement amount data representing the X direction movement amount is input to the moving image photographing unit main body 200 via the transmission cable 162. To be recorded.

  The moving body frame 110 may be moved by manually turning a handle 145 provided on the take-up drums 1421, 1422.

  The process of changing the mounting position of the Y-direction moving piece 120 with the tip 151 of the video scope 150 attached to the mounting portion 121 and shooting a two-dimensional moving image is repeated, and the two-dimensional over the entire surface of the beam end 410 of the narrow portion 600 is repeated. Get moving image data.

  From the X movement amount data and Y direction movement amount data recorded in the moving image photographing unit main body 200 and the two-dimensional moving image data recorded in the moving image photographing unit main body 200, still image data on the surface of the digit end 410 of the narrow portion 600. Is generated. The still image data can be generated by using a technique for automatically generating still image data by analyzing the two-dimensional moving image data, or, for example, extracting about two frames per second from the two-dimensional moving image data. Still image data may be created by synthesis.

  As described above, the narrow portion 600 formed between the beam end 410 of the concrete bridge superstructure 400 and the abutment parapet 510 is subjected to water leakage including an antifreezing agent, and examples of combined deterioration due to salt damage, frost damage, and the like. Although many have been confirmed, it was difficult for humans to go in directly to check the deterioration state in advance, and it was difficult to accurately grasp the deterioration state.

  However, since the narrow surface degradation inspection method of the present embodiment is a method using the narrow surface degradation inspection apparatus 100 that can travel two-dimensionally in the narrow portion 600, the narrow portion 600 that is difficult for humans to enter directly is used. The surface deterioration investigation can be realized without the person directly entering the narrow portion 600. In addition, since the narrow surface degradation inspection method of this embodiment is a method of generating still image data from position data and two-dimensional moving image data, an accurate shooting location can be specified based on the position data. The surface deterioration state of the narrow portion 600 can be accurately grasped. In addition, according to the narrow surface degradation inspection method of this embodiment, the parts that need repair are clarified before the repair is performed, so it is necessary to repair or repair parts that do not need repair in the subsequent repairs. Therefore, it is possible to avoid the need for re-repairing without repairing important parts, and it is not uneconomical. In addition, the repair method can be determined according to the surface deterioration state of the narrow portion 600. Furthermore, according to the narrow surface degradation inspection method of the present embodiment, it is also possible to directly confirm the effect of the repair performed by taking a two-dimensional moving image again after generating the repair and generating still image data. .

  In the above-described embodiment, the narrow portion referred to in the present invention has been described with reference to an example in which the narrow portion formed between the girder end of the concrete bridge superstructure and the abutment parapet, but the narrow portion referred to in the present invention is described. The portion is not limited to this, and may be, for example, a narrow portion formed between the opposite ends of the spar, and further, for example, between houses in a densely populated area, between a house and an outer wall, equipment such as a machine, etc. It may be a narrow part where a plurality of structures are close to each other, such as between a wall and a wall.

DESCRIPTION OF SYMBOLS 100 Narrow part surface deterioration investigation apparatus 110 Mobile body frame 111,112 Steel plate 113 Reinforcement board 114 Wheel 115,116 Pulley 120 Y direction moving piece 121 Attachment part 131 Fall prevention wire 132 Distance holding plate 140 Mobile body frame moving apparatus 141 Belt 1421 , 1422 Winding drum 143 Timing belt 1441, 1442 Motor 145 Handle 1461, 1462 Steel mount 147 Pipe 1471 Table 150 Videoscope 151 Tip 152 Other end 160 X-direction movement detection unit 161 Through-hole 162 Transmission cable 170 Y-direction movement Input means 180 Still image data generation unit 200 Rail 300 Video shooting unit main body 400 Concrete bridge superstructure 410 Girder end 510 Abutment parapet 520 Abutment top end 600 Narrow part

Claims (5)

A movable body frame movable in the X direction along the surface of the narrow structure between the structures;
A Y-direction moving piece attached to the moving body frame;
A scope in which the tip is attached to the Y-direction moving piece and the other end is coupled to the moving image photographing unit body;
An X-direction movement amount detection unit for detecting an X-direction movement amount of the moving body frame;
A Y-direction movement amount input means for inputting a Y-direction movement amount of the Y-direction movement piece;
A still image data generation unit that generates still image data of the structure surface from the X movement amount data and the Y direction movement amount data, and the two-dimensional moving image data recorded in the moving image photographing unit body;
A device for investigating the surface degradation of narrow portions between structures, characterized by comprising: 2. The structure according to claim 1, further comprising a distance holding member that prevents the moving body frame from falling and holds a distance between the moving body frame and the surface of the structure. Narrow surface degradation inspection device . The narrow portion is a narrow portion formed between a girder end of a concrete bridge superstructure and an abutment parapet, or a narrow portion formed between the opposite girder ends,
The movable body frame is movable in the X direction along the beam end of the narrow portion and the surface of the abutment parapet,
3. The narrow surface degradation inspection apparatus between structures according to claim 1 or 2, wherein the still image data generation unit generates still image data of a surface of the beam end or the abutment parapet . 4. The movable body frame to which the Y-direction moving piece to which the distal end of the scope is attached is attached to the narrow body surface deterioration inspection device between narrow structures according to any one of claims 1 to 3. insert the narrow portion between, said narrow portion is captured 2D video structure surface of the still image data generating unit to the structure surface of the still image data between structure creation you, characterized in that to produce Method for investigating surface degradation in narrow areas. The narrow portion, the narrow portion formed between the girder ends and the abutment parapet of concrete bridges superstructure, or claim 4, characterized in that the narrow portion formed between該桁end facing constriction surface degradation investigation method between structures.

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