JP7202950B2 - Concrete floating detection method - Google Patents

Description

The present invention relates to a floating detection method for detecting floating of concrete on the wall surface of a tunnel.

Structures such as tunnels and bridges require periodic inspections to check for damage. Such inspections are carried out, for example, by taking images of the walls of structures, such as by driving a vehicle equipped with a large camera to take pictures inside a tunnel, or by attaching a camera to an arm to move under a bridge girder. I was taking pictures.

However, if the image of the wall surface is simply photographed, it is difficult to determine from the image whether the concrete has lifted or peeled off from the wall surface. For this reason, a worker hits the wall surface with a hammer or the like to perform a hammering test, and by listening for differences in sound, the lift or peeling of the concrete has been determined. With such a method, it is difficult for an operator to accurately judge lifting or peeling of concrete unless the operator is skilled in the work.

As a method for accurately and quantitatively judging whether the concrete is lifted or peeled off, for example, the method of searching for the mortar lifted portion disclosed in Patent Document 1 may be used. In the method of searching for the mortar floating part of Patent Document 1, the presence or absence of the mortar layer floating from the concrete is determined by applying the evaporation liquid to the wall surface coated with the mortar layer on the concrete and then measuring the wall surface temperature. are judging. Evaporation liquid is a volatile liquid such as alcohol, benzine, or ether. According to Patent Document 1, by using such a method, the location of the floating portion of the mortar can be searched with high accuracy without requiring skill.

JP-A-8-145923

If the structure to be inspected is an open site or a site with ventilation equipment, the method of searching for floating mortar portions in Patent Document 1 can be used. However, when the wall surface in the tunnel is to be inspected, cables are laid near the wall surface in the tunnel, and ventilation equipment is not always in place. Therefore, the use of flammable liquids such as alcohol, benzine, and ether as evaporating liquids should be avoided in tunnels. Moreover, even if tap water, which is not flammable, is used as a cooling liquid, it hardly functions as a cooling liquid because it evaporates extremely slowly in the tunnel. For this reason, the method of Patent Document 1 cannot be adopted when the wall surface in the sinus is to be inspected.

SUMMARY OF THE INVENTION An object of the present invention is to provide a floating detection method capable of easily and reliably detecting floating of concrete on the wall surface of a tunnel.

In order to solve the above problems, a representative configuration of the floating detection method according to the present invention includes a thermography, a truck for supporting the thermography, a rail on which the truck runs, and a predetermined length extending from the vicinity of both ends of the rail. A floating detection method for detecting floating of concrete on the wall surface of a tunnel using a photographing device having is photographed by a photographing device, and the floating of concrete is determined from the temperature distribution on the wall surface of the tunnel.

In the above configuration, the tunnel wall is first cooled with dry ice or an air cooler. If the concrete does not float, the temperature of the wall surface returns to near the temperature before cooling after a predetermined time has passed since cooling. On the other hand, if there is a float in the concrete, the air in the crack acts as a heat insulating layer, and the float remains in a cooled state even after a predetermined time has passed since cooling. Therefore, by photographing the temperature distribution of the tunnel wall surface after a predetermined time has passed since cooling, it is possible to easily and reliably detect the floating of the concrete on the tunnel wall surface.

At this time, since the member used for cooling is dry ice or an air cooler, ignition does not occur in the tunnel. Therefore, it is possible to safely obtain the effects described above. In addition, the image of the temperature distribution captured by thermography displays different colors for each temperature, so the temperature distribution on the wall surface of the tunnel can be visually grasped.

It is preferable to store the dry ice in a container and blow cold air onto the wall surface of the tunnel with a fan provided in the container. As a result, the cold air of dry ice can be suitably blown against the tunnel wall surface by the fan, and the tunnel wall surface can be efficiently cooled.

It is preferable to connect the nozzle of the air cooler to the container and blow cool air to the wall of the tunnel with a fan provided in the container. As a result, the cool air of the air cooler can be suitably blown against the tunnel wall surface by the fan, and the tunnel wall surface can be efficiently cooled.

It is preferable to connect the nozzle of the air cooler to a head having a larger area than the nozzle of the air cooler and to have airtightness, and cool the wall surface of the sinus through the head. According to such a configuration, cold air from the air cooler can be blown to a wider area of the tunnel wall surface. Therefore, it becomes possible to cool the tunnel wall surface more efficiently.

Advantageous Effects of Invention According to the present invention, it is possible to provide a concrete floating detection method that can easily and reliably detect concrete floating on a wall surface of a tunnel.

It is a figure explaining the tunnel road to which the concrete floating detection method concerning this embodiment is applied. 1 is a perspective view of an imaging device used in the float detection method of the present embodiment; FIG. It is a figure explaining the procedure of the floating detection method of this embodiment. It is a figure explaining the float of concrete, and a temperature change. It is a figure explaining the variation of a coolant. It is a figure explaining the variation of a coolant. It is a figure explaining the variation of a coolant.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are given the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are omitted from the drawings. do.

FIG. 1 is a diagram for explaining a tunnel to which a concrete floating detection method (hereinafter simply referred to as "floating detection method") according to the present embodiment is applied. In the floating detection method according to the present embodiment, floating of concrete on the wall surface 104 of the tunnel 102 shown in FIG. 1 is detected. As shown in FIG. 1, a tunnel 102 is a structure excavated by, for example, a shield construction method and whose wall surfaces 104 are reinforced with plates called segments. Since the segments are concrete blocks, cracks may occur due to deterioration over time. Therefore, in the tunnel 102, periodic inspections are required to check whether the wall surface 104 is damaged or not.

A plurality of cables 106 such as power cables and communication cables are accommodated in the tunnel 102 and laid near the wall surface 104 . Vertical metal fittings 108 extending in the vertical direction are installed near the wall surface 104 . A cross arm 110 is attached to the vertical hardware 108 . The arms 110 are vertically spaced apart from each other in a plurality of stages, and extend horizontally away from the wall surface 104 . The cable 106 is installed on a cross arm 110 attached to a vertical metal fitting 108 and laid along the vicinity of the wall surface 104 inside the tunnel 102 .

FIG. 2 is a perspective view of the photographing device 100 used in the float detection method of this embodiment. The photographing device 100 is a device for photographing the wall surface 104 (see FIG. 1) inside the tunnel 102 . The imaging device 100 includes an imaging jig 101 as shown in FIG. The photographing jig 101 includes a rail 118 on which the camera 114 and the thermography 116 travel, a pair of legs 120 and 122, and a pair of legs 124 and 126. As shown in FIG. The pair of legs 120 and 122 extend in a predetermined direction (here, as an example, the photographing direction of the thermography 116) from the vicinity of both ends 128 and 130 of the rail 118 and have a predetermined length.

The pair of legs 124 and 126 are provided at the tips 132 and 134 of the pair of legs 120 and 122, and the legs 120 and 122 are positioned at a predetermined angle (right angle here) with respect to the wall surface 104 inside the tunnel 102. fixed. Specifically, the pair of legs 124, 126 extend in a direction perpendicular to the longitudinal direction of both the rail 118 and the pair of legs 120, 122, and extend bidirectionally (both directions) from the pair of legs 120, 122. It extends to form a T shape.

Here, in order to securely fix the legs 120 and 122 to the wall surface 104 at a predetermined angle, it is necessary to form a plane (quadrilateral) including the pair of legs 124 and 126 as two sides. Therefore, the longitudinal direction of the pair of legs 124 and 126 does not necessarily have to be orthogonal to the longitudinal direction of the rail 118 as long as this plane can be formed.

However, if the longitudinal direction of the pair of legs 124 and 126 becomes parallel to the longitudinal direction of the rail 118, a plane cannot be formed and the legs 120 and 122 cannot be stably fixed to the wall surface 104. For this reason, the pair of legs 124 and 126 are set to extend in a direction not parallel to the longitudinal direction of the rail 118 .

The photographing apparatus 100 further includes a camera 114 , a thermography 116 and a carriage 136 in addition to the photographing jig 101 . The camera 114 takes normal visible light images, and the thermography 116 takes infrared images (temperature distribution images). Camera 114 and thermography 116 are mounted on carriage 136 capable of traveling on rail 118 . By taking visible and infrared images at the same time, visible deterioration such as cracks is recorded in the visible image, and invisible buoyancy is recorded in the infrared.

Carriage 136 also has lights 138 , 140 mounted near each side of camera 114 . Therefore, the camera 114 can travel along the rail 118 together with the lights 138 and 140, which are light sources, and can photograph the wall surface 104 in the tunnel 102 even in a dark place with a minimum light source.

Here, the distance and angle of the rail 118 with respect to the wall surface 104 in the tunnel 102, which is the object to be photographed, will be described. The rail 118 is kept at a constant distance from the wall surface 104 in the tunnel 102 by means of legs 120 and 122 of predetermined lengths extending from near both ends 128 and 130 in the imaging direction of the thermography 116 .

The rail 118 is further at an angle to the wall surface 104 within the tunnel 102 by means of feet 124, 126 that fix the legs 120, 122 at a predetermined angle to the wall surface 104 within the tunnel 102. Therefore, the rail 118 is maintained at a constant distance and angle with respect to the wall surface 104 in the tunnel 102 .

FIG. 3 is a diagram for explaining the procedure of the float detection method of this embodiment. In the float detection method of this embodiment, first, the worker P1 cools the wall surface 104 of the tunnel 102 using a coolant such as dry ice or an air cooler, which will be described later. Then, when a predetermined period of time, for example, one minute, has passed since the cooling, the worker P2 takes an image of the position after the predetermined period of time has passed using the photographing device 100 shown in FIG. While the worker P2 is photographing, the worker P1 cools down the next inspection location.

When photographing, worker P2 first moves legs 120 and 122 and feet 124 and 126 toward wall surface 104 so as to avoid cable 106, and then moves feet 124 and 126 toward wall surface 104. press against. This maintains the rail 118 at a constant distance and angle from the wall surface 104, even at a location 112 between the cable 106 and the wall surface 104 where only a small space can be secured. Next, the worker 114 runs the thermography 116 on the rail 118 to photograph the wall surface 104 inside the tunnel 102 at a certain distance and at a certain angle.

In the floating detection method of the present embodiment, after an image is captured by the thermography 116, the temperature distribution of the wall surface 104 of the tunnel 102 in the image is referenced to determine whether the concrete is floating.

FIG. 4 is a diagram for explaining concrete float and temperature change. As shown in FIG. 4A, it is assumed that rust 105a generated on a reinforcing bar 105 expands on a concrete wall surface 104, causing cracks 104a in the concrete and floats 104b. When the wall surface 104 is cooled, as shown in FIG. 4B, the float 104b and other portions are also cooled (the cooled range is indicated by horizontal hatching in the figure). Then, when a predetermined time has passed since cooling, heat is transferred from the deep part of the wall surface 104 and the surface of the wall surface 104 is warmed. If the concrete does not float, the temperature of the wall surface 104 uniformly returns to near the temperature before cooling after a predetermined time has passed since cooling.

However, when there is a float 104b, the air in the crack 104a acts as a heat insulating layer as shown in FIG. 4(c). Then, since the portion of the float 104b warms up slowly, the temperature is low even after a predetermined time has passed since cooling, and a temperature difference occurs between the float 104b and the portion other than the float. Therefore, by photographing the temperature distribution of the wall surface 104 of the tunnel 102 after a predetermined time has passed since cooling, it is possible to easily and reliably detect the floating of the concrete on the wall 104 of the tunnel 102 by the thermography 116 . .

In particular, in the float detection method of this embodiment, since dry ice or an air cooler is used as a coolant, ignition in the tunnel 102 does not occur. Therefore, it is possible to safely obtain the effects described above. In addition, since the temperature distribution image captured by the thermography 116 is displayed in different colors for each temperature, the temperature distribution of the wall surface 104 of the tunnel 102 can be visually grasped.

5 to 7 are diagrams for explaining variations of the coolant. A coolant 200a shown in FIG. In coolant 200a, dry ice 202 is contained in a container 206 with insulation 204 disposed therebetween. The worker P1 rubs the dry ice 202 against the wall surface 104 of the tunnel 102 while gripping the container 206 to cool the wall surface 104 of the tunnel 102 . At this time, since the heat insulating material 204 is arranged between the container 206 and the dry ice 202, it is possible to suppress the transmission of cold air to the hand of the worker P1.

A cooling material 200b shown in FIG. As a result, with the dry ice 202 housed in the container 206 and the lid 208 attached, the lid 208 is pressed against the wall surface 104 of the tunnel 102 , and the fan 210 cools the dry ice 202 onto the wall surface of the tunnel 102 . 104 is sprayed. Therefore, the wall surface 104 of the tunnel 102 can be cooled more efficiently than when the worker P1 manually rubs the dry ice 202 onto it. Further, even if the wall surface 104 has many irregularities and the surface of the block of dry ice is difficult to adhere to, the surface can be cooled evenly by the method of blowing cold air. As a power supply for the fan 210, for example, a mobile battery (not shown) can be preferably used.

A coolant 200c shown in FIG. 6A is an air cooler. Compressed air from a compressor (not shown) is supplied to the supply port 222 of the coolant 200c. Then, the compressed air rotates at high speed while expanding in the coolant 200c, and moves toward the discharge port 224 as a whirlpool. At this time, the residual air that has not been discharged from the discharge port 224 turns into cold air and flows to the jet port 226 while rotating. As a result, cool air is ejected from the ejection port 226 of the coolant 200c. By using such an air cooler as the cooling material 200c, the wall surface 104 of the tunnel 102 can also be suitably cooled.

Coolant 200d shown in FIG. 6(b) is configured by combining container 206 and its lid 208 shown in FIG. 5(b) and coolant 200c (air cooler) shown in FIG. 6(a). In 200d shown in FIG. 6B, the nozzle 228 of the coolant 200c (air cooler) is connected to the container 206 in which the dry ice 202 is not stored. Thereby, the cool air from the coolant 200c can be blown against the wall surface 104 of the tunnel 102 by the fan 210. FIG. Therefore, it is possible to efficiently cool a wider area than when only the coolant 200c is used.

A coolant 200e shown in FIG. 7A is configured by combining the coolant 200c (air cooler) shown in FIG. The head 230 has a larger area than the nozzle 228 of the cooling material 200c, which is an air cooler, and has airtightness. Also, the head 230 is formed with a connection hole 232 having substantially the same diameter as the nozzle 228 of the coolant 200c.

Then, as shown in FIG. 7B, by connecting the nozzle 228 of the coolant 200c to the connection hole 232 of the head 230 and blowing cold air from the coolant 200c, the wall surface of the tunnel 102 is discharged through the head 230. 104 is cooled. This makes it possible to efficiently cool a wider area than when only the coolant 200c is used.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope described in the claims, and these also belong to the technical scope of the present invention. Understood.

INDUSTRIAL APPLICABILITY The present invention can be used as a floating detection method for detecting floating of concrete on the wall surface of a tunnel.

DESCRIPTION OF SYMBOLS 100... Imaging apparatus, 101... Jig for imaging, 102... Tunnel, 104... Wall surface, 104a... Crack, 104b... Float, 105... Reinforcement bar, 105a... Rust, 106... Cable, 108... Vertical hardware, 110... Cross arm , 114... camera, 116... thermography, 118... rail, 120... leg, 122... leg, 124... foot, 126... foot, 128... both ends, 130... both ends, 132... tip, 134... tip, 136 Carriage 138 Light 140 Light 200a Coolant 200b Coolant 200c Coolant 202 Dry ice 204 Heat insulating material 206 Container 208 Lid 210 Fan 222 Supply port 224 Discharge port 226 Ejection port 228 Nozzle 230 Head 232 Connection hole

Claims (4)

Using an imaging device comprising a thermograph, a cart for supporting the thermograph, a rail on which the cart runs, and legs of a predetermined length extending from the vicinity of both ends of the rail, concrete floats on the wall surface of the tunnel are detected. A float detection method for detecting,
Cooling the tunnel wall surface with dry ice or an air cooler,
Photographing a position after a predetermined time has passed since cooling with the photographing device,
A concrete lift detection method, wherein the concrete lift is determined from the temperature distribution of the tunnel wall surface. 2. The method for detecting floating of concrete according to claim 1, wherein the dry ice is contained in a container, and a fan provided in the container blows cold air against the wall surface of the tunnel. 2. The concrete floating detection method according to claim 1, wherein a nozzle of said air cooler is connected to a container, and a fan provided in said container blows cool air against said tunnel wall surface. 2. The concrete structure according to claim 1, wherein the nozzle of the air cooler is connected to a head having a larger area than the nozzle of the air cooler and having airtightness, and the wall surface of the tunnel is cooled through the head. floating detection method.

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