Sleeve position inspection system and sleeve position inspection method

Abstract

To provide a sleeve position inspection system for inspecting whether a sleeve is installed on a reinforcing steel structure based on a sleeve installation plan.SOLUTION: A sleeve position inspection system is comprised of: sleeve information storage means 1 for storing data including the installation position and attribute information of a sleeve S; a sleeve identification ring 2 attached to the sleeve S; sleeve attribute information display means 3 attached to the surface of the sleeve identification ring 2 and capable of image recognition by photographing with a camera 4; the camera 4 for photographing an installation position of the sleeve S; image display means 5 for displaying an image of the sleeve position by AR generated based on the installation position information of the sleeve and an image taken by the camera 4 in a superimposed manner, thereby specifying the installation position of the sleeve S; and sleeve attribute information comparison means 6 for comparing the sleeve attribute information stored in the sleeve information storage means 1 with the sleeve attribute information acquired from the sleeve attribute information display means 3 photographed by the camera 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a sleeve position inspection system and a sleeve position inspection method that enable reliable, efficient, and economical inspection before concrete is poured to ensure that sleeves, which are installed after reinforcing bars are arranged in beams and walls of reinforced concrete (hereinafter referred to as "RC") buildings before concrete is poured, are installed as planned in design documents, etc. [Background technology]

[0002] In RC buildings, beams and walls are provided with through holes for passing various pipes used for water, gas, air conditioning, etc., as well as electrical and communication wiring. This type of through hole is mainly formed by attaching a sleeve (cylindrical body) made of paper void pipes to the reinforcing steel structure before pouring concrete after reinforcing steel is arranged in beams and walls, and pouring concrete after the sleeve is attached.

[0003] After the sleeves are installed, and before the concrete is poured, inspections are periodically conducted to check whether each sleeve is present and whether its diameter, position, etc. are appropriate.

[0004] Conventionally, this type of sleeve inspection was carried out manually by on-site workers who, after the sleeves were attached to reinforced concrete structures such as beams and walls, would measure and record the diameter, position, use, etc. of each sleeve while looking at construction drawings, before the concrete was poured.

[0005] Furthermore, for example, Patent Document 1 discloses an invention for a sleeve position inspection device that inspects whether sleeves attached to reinforced concrete structures such as beams and walls are attached in the appropriate position before concrete is poured.

[0006] Specifically, when a reinforced concrete structure is a structure consisting of reinforcement bars and sleeves before concrete is poured, the sleeve position inspection device comprises: an AR model storage means for storing an AR model of the reinforced concrete structure; a reference marker placed inside or near the reinforced concrete structure at a position known in the AR model; a sleeve marker placed on the sleeve to measure the position of the sleeve; a sensing device that senses the reference marker and at least one sleeve marker in that order and senses the reference marker again after sensing these markers; a sleeve marker position analysis means for analyzing the position of the sleeve marker associated with the reference marker from data obtained by sensing with the sensing device; and a sleeve marker position discrimination means for comparing the position of the sleeve marker analyzed by the sleeve marker position analysis means with the AR model stored in the AR model storage means to determine whether the position of the sleeve is correct. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 6703360 Summary of the Invention [Problem to be solved by the invention]

[0008] However, depending on the size of the building, the sleeves may be installed in hundreds of locations, and it would take a lot of time and effort for on-site workers to inspect all of them. Furthermore, it would be extremely difficult to accurately inspect all sleeves within a limited period of time, and there was a risk that some would be missed.

[0009] Furthermore, in order to measure the position of each sleeve, the sleeve position inspection device of Patent Document 1 senses a reference marker installed at a known position in an AR model of a reinforcing bar structure consisting of a reinforcing bar and a sleeve, a sleeve marker installed on the sleeve to measure the position of the sleeve, the reference marker and at least one sleeve marker, in that order, and then senses the reference marker again after sensing these markers, which makes the measurement work very cumbersome and there is a risk of erroneous measurement due to mistakes in the sensing target and the number of sensing attempts, etc.

[0010] Furthermore, since the sleeve marker is attached to an opening adhesive sheet that is affixed to close the opening of the sleeve, or a side adhesive sheet that is affixed to the side of the sleeve, the process of affixing the adhesive sheet is troublesome, and it is assumed that the adhesive sheet is used only once and then discarded, which is extremely uneconomical.

[0011] The present invention has been made to solve the above-mentioned problems, and aims to provide a sleeve position inspection system and a sleeve position inspection method that can reliably, efficiently, and economically inspect before pouring concrete to ensure that sleeves that are attached to reinforced concrete structures such as the beams and walls of an RC building after reinforcing bars are arranged in the beams and walls, are installed as planned in design documents, etc. [Means for solving the problem]

[0012] The present invention is a sleeve position inspection system for confirming that a sleeve is installed in a planned position at a construction site, and is characterized by comprising: a sleeve information storage means for storing data including sleeve installation position information and attribute information based on a sleeve installation plan drawing; a sleeve identification ring having a diameter corresponding to the diameter of the sleeve to be inspected and attached directly or indirectly to the end of the sleeve at the construction site; a sleeve attribute information display means attached to the surface of the sleeve identification ring and capable of image recognition by camera photography; a camera for photographing the installation position of the sleeve installed at the construction site; an image of the sleeve position (AR model) generated based on the installation position information of the sleeve using AR (augmented reality), an image display means for displaying an image photographed by the camera by superimposing the image photographed by the camera, and identifying the installation position of the sleeve installed at the construction site; and a sleeve attribute information comparison means for comparing the sleeve attribute information stored in the sleeve information storage means with the sleeve attribute information acquired from the sleeve attribute information display means photographed by the camera.

[0013] The sleeve attribute information includes use information, dimensional information, specification information, etc. of the sleeve, and preferably includes at least one of these pieces of information.

[0014] The sleeve attribute information display means includes characters, figures, patterns, colors, markings, QR codes (registered trademark of Denso Wave Inc.), etc., and it is preferable that the sleeve attribute information display means includes at least one of these display means.

[0015] In addition, the image display means and camera can be a display and a camera provided on a mobile terminal such as a smartphone or tablet, or a terminal connected via a communication line, and it is preferable that at least one of these is included.

[0016] Furthermore, by providing an AR digital measure (AR measure) that measures dimensions within an image captured by a camera equipped on a mobile terminal such as a smartphone, the position and diameter of the sleeve can be easily measured within the display image.

[0017] In addition, since the sleeve identification ring has a fitting portion that fits into the outer peripheral surface of the sleeve end, it can be removably and easily attached to the end of the sleeve and can be used repeatedly.

[0018] Furthermore, by providing a ring body having a predetermined width in the radial direction exposed on the surface side of the sleeve end face, the sleeve attribute information display means can be easily installed on the surface of the ring body.

[0019] The sleeve main body may have a flange-like shape with a predetermined width in the radial inward and / or outward direction of the sleeve end, and a sleeve attribute information display means may be provided on the surface of the ring main body.

[0020] The material of the sleeve identification ring may be plastic, rubber, metal, paper, etc. Furthermore, the sleeve identification ring may be formed by a coating material applied to the surface of the sleeve end, and the coating material may also serve as the sleeve attribute information display means. Effect of the Invention

[0021] According to the present invention, by comparing an AR image (AR model) of the sleeve position generated based on sleeve installation position information with an image of the installation position of the sleeve to be installed on reinforced concrete structures such as beams and walls of an RC building at a construction site, it is possible to reliably, efficiently, and extremely economically inspect before concrete is poured that sleeves installed on reinforced concrete structures such as beams and walls of an RC building after the reinforcement of the reinforced concrete structures is installed as planned based on the sleeve installation plan.

[0022] In addition, the AR image of the sleeve position generated based on the sleeve installation position information can be easily displayed on the display of a mobile terminal such as a smartphone or tablet, and an image of the installation position of the sleeve installed on reinforced concrete structures such as beams and walls of RC buildings at a construction site can be easily captured by the camera of the tablet terminal. Furthermore, the AR image of the sleeve position and the image of the installation position of the sleeve installed on the reinforced concrete structure can be easily compared by overlaying them on the display of the same mobile terminal.

[0023] Furthermore, the sleeve identification ring can be easily attached by fitting it onto the end of a sleeve that is installed in a reinforcing steel structure such as the beams or walls of an RC building before the concrete is poured, and since it can be attached detachably, it can be used repeatedly, making it extremely economical. [Brief description of the drawings]

[0024] [Figure 1] 1 is a block diagram showing an overall configuration of an embodiment of a sleeve position inspection system of the present invention; [Diagram 2] The figures show a reinforced concrete structure of a beam with a sleeve attached before concrete is poured, with Fig. 1(a) being a partial front view and Fig. 1(b) being a longitudinal cross-sectional view of Fig. 1(a). [Diagram 3] 1A and 1B are diagrams illustrating a sleeve with a sleeve identification ring attached, in which FIG. 1A is a perspective view and FIG. [Figure 4] FIG. 1(a) is a longitudinal cross-sectional view of a sleeve with a sleeve identification ring attached. [Diagram 5] 1 illustrates a sleeve having a sleeve identification ring attached thereto, and FIGS. 1(a)-1(h) are longitudinal cross-sectional views of the end portion of the sleeve. [Figure 6] 13 is a front view of a sleeve identification ring using markings as a sleeve attribute information display means. FIG. [Figure 7] This is a front view of the projection surface / scale adjustment marker. [Figure 8] FIG. 4 is a flow chart illustrating the procedure of the sleeve position inspection method of the present invention. [Figure 9] FIG. 13 is a longitudinal cross-sectional view of the end of a conventional sleeve with only an end cover attached. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Figures 1 to 7 illustrate one embodiment of the present invention, which is a sleeve position inspection system for verifying that sleeves installed on reinforced concrete structures such as beams and walls of RC buildings at a construction site before concrete is poured are installed in accordance with a sleeve installation plan.

[0026] In the figure, sleeve S is a cylindrical body used to form through holes in RC structures such as the beams and walls of an RC building to pass various pipes used for water, gas, air conditioning, etc., as well as electrical and communication wiring.It is usually made from a circular or rectangular paper void pipe or PVC pipe so that it can be installed without any special processing, and is attached to reinforced concrete structures Y such as beams and walls before concrete is poured.

[0027] Furthermore, symbol 1 denotes a sleeve information storage means that stores data including installation position information and attribute information of the sleeve S based on a sleeve installation plan drawing, the sleeve installation plan drawing being created by a CAD for equipment construction drawings (T-FAS, Repro, etc.) for on-site construction, and the sleeve attribute information includes use information, dimensional information, specification information, etc. of the sleeve S.

[0028] Reference numeral 2 denotes a sleeve identification ring having a diameter corresponding to the diameter of the sleeve S to be inspected, which is attached directly or indirectly to the end of each sleeve S at the construction site.

[0029] The sleeve identification ring 2 is formed into a circular or rectangular ring shape based on the cross-sectional shape of the sleeve S, and is equipped with an engagement portion 2a that engages with the end outer surface or end inner surface of the sleeve S, and a ring main body portion 2b having a predetermined radial width exposed on the end surface side of the sleeve S.

[0030] The fitting portion 2a is formed so as to be removable by fitting into the outer or inner peripheral surface of the end portion of the sleeve S, and is formed so as not to easily fall off after installation, particularly when pouring the concrete and after the concrete has hardened.

[0031] In addition, the sleeve identification ring 2 is conventionally installed at the end of the sleeve S, and is formed so as to be attached from the top of the end cover 2c made of adhesive tape (packaging tape) or the like that covers the end of the sleeve S.

[0032] In addition, if the cover 2c covering the end of the sleeve S is not required, or if the end cover 2c is transparent, it may be formed so as to be attached using an adhesive such as double-sided adhesive tape instead of the fitting portion 2a.

[0033] The sleeve main body 2b is formed with a predetermined width in the radial inward and / or outward direction of the end of the sleeve S, and a sleeve attribute information display means 3, which will be described later, is provided on the surface of the ring main body 2b (see Figures 1 and 4).

[0034] In addition, the surface of ring body 2b has a color and brightness aimed at improving the accuracy of image recognition by camera 4 equipped on a mobile terminal such as a smartphone or tablet described below (the higher the contrast, the higher the recognition rate).

[0035] The visible width of ring body 2b is basically set to be at least as wide as possible to allow image recognition by camera 4 of a mobile terminal such as a tablet, which will be described later, and is formed to be approximately 1 to 2 cm.

[0036] The sleeve identification ring 2 is made of a material that is not affected by rainwater or moisture in concrete and does not adversely affect the concrete structure that it comes into contact with, for example. It is made of plastic, rubber, metal, paper, etc.

[0037] In addition, when the end cover 2c of the sleeve S is not required or when the end cover 2c is transparent, a coating material 2d may be applied to the end surface of the sleeve S to form a sleeve identification ring 2 (see Figures 5(g) and (h)).

[0038] Also, reference numeral 2e denotes an alignment point for the sleeve identification ring 2, reference numeral 2f denotes an IC tag such as an RFID tag, which can read and write information such as use information, dimensional information, and specification information of the sleeve S. Reference numeral 2g denotes an inspection progress marking.

[0039] Symbol 3 denotes a sleeve attribute information display means that is attached to the surface of the sleeve identification ring 2, i.e., the surface of the ring main body 2b, and can be image-recognized by photographing with a camera 4 equipped on a mobile terminal such as a smartphone or tablet, which will be described later.

[0040] The sleeve attribute information display means 3 includes characters, figures, patterns, colors, markings, bar codes, QR codes (registered trademark), etc., and at least one of these is attached to the sleeve attribute information display means 3. Various necessary information such as position information regarding the sleeve S is displayed on the surface of the ring main body 2b by one or more sleeve attribute information display means 3 such as characters and figures.

[0041] For example, in Figure 6 and Table 1, the diameter and affiliation of sleeve S are indicated by the arrangement (position) of markings a, b, c, and d and the affiliation identification color marker 2h (color, etc.). It is installed as a supplementary information reading method because it is predicted that the accuracy of reading the diameter dimension, etc. of sleeve S is low using only the image taken by the camera 4 equipped in a mobile terminal such as a smartphone.

[0042] To explain, markings a, b, c, and d indicating the diameter dimension of the sleeve S are provided at intervals at multiple points in the circumferential direction on the surface of the ring main body 2b of the sleeve identification ring 2, and an affiliation identification color marker 2h indicating the affiliation of the sleeve S is provided at the lower end of the surface of the ring main body 2b.

[0043] For example, the diameter of a sleeve S with marking a on one location on the ring body 2b is indicated as 300 mm, and the diameter of a sleeve S with markings a and c on two locations on the ring body 2b is indicated as 400 mm. In addition, by setting the color of the affiliation identification color marker 2h in advance for each affiliation (facilities, electricity, construction, etc.) of the sleeve S, the affiliation of the sleeve S is indicated by the color of the affiliation identification color marker 2h.

[0044] [Table 1]

[0045] Symbol 4 denotes a camera that photographs the installation position of an inspection target sleeve S attached to a reinforced concrete structure Y such as a beam or wall of an RC building before concrete is poured at a construction site, and camera 4 is a camera equipped on a mobile terminal such as a smartphone or tablet.

[0046] The mobile device such as a smartphone is equipped with a measurement AR measure that, together with the camera 4, measures dimensions within the image captured by the camera 4, and the position and diameter of the sleeve S can be easily measured within the image of the mobile device such as a smartphone using the measurement AR measure.

[0047] Reference numeral 5 denotes an image display means for identifying the installation position of the sleeve S attached to a reinforced concrete structure Y before concrete is poured, such as a beam or wall of an RC building, by superimposing and displaying an AR image (AR model) of the position of the sleeve S generated based on the installation position information of the sleeve S and an image of the position of the sleeve S to be inspected taken by a camera 4 equipped on a mobile terminal such as a smartphone or tablet, and the image display means 5 uses a display equipped on a mobile terminal such as a smartphone or tablet.

[0048] And, reference numeral 6 denotes a sleeve attribute information comparison means which compares the attribute information of the sleeve S stored in the sleeve information storage means 1 with the sleeve attribute information read from the sleeve attribute information display means 3 by photographing with the camera 4. By matching the attribute information of the sleeve S with the sleeve attribute information read from the sleeve attribute information display means 3, it is possible to confirm that the sleeve S attached to the reinforced concrete structure Y such as the beams and walls of an RC building before pouring concrete has been installed based on the sleeve installation plan.

[0049] In the above-described configuration, the procedure of the sleeve position inspection method of the present invention will now be described (see the flow chart of FIG. 9). (1) First, the installation location and attribute information (use information, dimensional information, specification information, etc.) of each sleeve S from the on-site construction sleeve (sleeve for equipment, electricity, construction, etc.) installation plan drawing (hereinafter referred to as the "sleeve plan drawing") created using equipment construction drawing CAD (T-FAS, Repro, etc.) is written out in an IFC common format. (2) Next, each sleeve S is numbered, and a database containing the dimensions, specifications, affiliation, location information, etc. of each sleeve S is created, and linked to the sleeve S on the drawing data of the sleeve installation plan. (3) Next, as a preparation before starting the inspection at the construction site, the reference point of the reinforced concrete structure Y before concrete is poured, such as the beams and walls of an RC building at the construction site, is aligned with the reference point on the image (AR model) of the sleeve installation position of the reinforced concrete structure Y generated by AR based on the installation position information of the sleeve S. The center line of the beams, walls, etc. before concrete is poured can be used as the reference point.

[0050] This makes it possible to align the AR model of reinforced concrete structure Y, such as beams and walls, before concrete is poured, with reinforced concrete structure Y, such as beams and walls of an RC building at a construction site, before concrete is poured.

[0051] In addition, the projection surface of the AR digital measure and the projection surface / scale adjustment markers for adjusting the reference dimensions (see FIG. 7) are placed at predetermined positions on the reinforced concrete structure Y such as beams and walls. (4) Next, an AR model of a reinforced concrete structure Y such as a beam or wall is projected onto a display of a mobile device such as a smartphone to display the position of the sleeve S to be inspected. (5) Next, the camera 4 equipped on the mobile terminal such as a tablet photographs the inspection area of ​​the reinforcing steel structure Y such as a beam or wall in which the sleeve S to be inspected is installed. (6) Next, using the image recognition technology provided in the sleeve attribute information matching means 6, the shape, etc. of the inspection target sleeve S with the sleeve identification ring 2 installed is extracted and recognized from an image taken by the camera 4 provided in a mobile terminal such as a smartphone or tablet, and ... is matched with the AR model of the reinforced concrete structure Y to confirm the presence, position, and consistency of attribute information (use, etc.) of the sleeve S.

[0052] In addition, the installation position of the sleeve S to be inspected is measured. The items to be measured include the diameter of the sleeve S to be inspected, the installation position (height from the reference point, horizontality), material, affiliation (purpose, etc.), and the presence or absence of reinforcing bars that reinforce the periphery of the sleeve S.

[0053] Moreover, to measure the installation position of the sleeve S, the measurement mode is switched to a measurement mode on an AR model of a reinforcing steel structure Y such as columns and beams of an RC building, and the AR digital tape measure is aligned with the actual inspection target sleeve S to measure. The measured dimensions are recorded in the sleeve information storage means 1 as measurement data.

[0054] More specifically, an AR digital measure is displayed on the screen of a tablet device such as a smartphone, and the position and diameter of the sleeve S to be inspected are measured on the tablet device screen using the AR digital measure.

[0055] In order to perform accurate measurements using the AR digital measure, a projection plane / scale adjustment marker 7 as shown in Fig. 7 is installed within the measurement range of the reinforcing steel structure Y. The projection plane / scale adjustment marker 7 is composed of three marker bodies 8,8 arranged at regular intervals in three locations on the same vertical plane, and multiple frames 9 arranged between each of the marker bodies 8,8 and holding each of the marker bodies 8,8.

[0056] Then, on the screen of the mobile terminal, the plane on which the AR digital measure is projected is specified based on the plane formed by the marker bodies 8, 8 and the distance L between the marker bodies 8, 8, and the scale is adjusted to match the reality to perform measurements.

[0057] During measurement, the AR digital measuring tape and the electronic whiteboard are photographed at the same time as evidence photos, and are recorded as data in the sleeve information storage means 1.

[0058] After the inspection is completed, an inspection progress marking 2g is attached to the sleeve identification ring 2 so that the progress of the sleeve inspection can be confirmed. In addition, the necessary inspection records are written out as an inspection record form and the inspection is reported online to the relevant parties. [Industrial Applicability]

[0059] The present invention makes it possible to reliably, efficiently, and economically inspect, before concrete is poured, whether sleeves, which are installed after reinforcing bars are arranged in reinforced concrete structures such as beams and walls of RC buildings before concrete is poured, are installed as planned in design documents, etc. [Explanation of symbols]

[0060] S sleeve, Y RC building steel structure, a,b,c,d marking 1 sleeve information storage means, 2 sleeve identification ring, 2a fitting portion, 2b ring body, 2c end cover, 2d coating material, 2e alignment point, 2f alignment point, 2g inspection progress marking, 2h affiliation identification color marker, 3. Sleeve attribute information display means 4 Camera equipped in mobile terminal, etc., 5 Image display means, 6 Sleeve attribute information matching means, 7 Projection plane / scale adjustment marker, 8 marker bodies, 9 frames

Claims

1. A sleeve position inspection system for verifying that a sleeve is installed in a planned position at a construction site, comprising: a sleeve information storage means for storing data including sleeve installation position information and attribute information based on a sleeve installation plan drawing; a sleeve identification ring having a diameter corresponding to the diameter of the sleeve to be inspected and attached directly or indirectly to the end of the sleeve at the construction site; and a sleeve attribute information display means attached to the surface of the sleeve identification ring and capable of image recognition by photographing with a camera; A sleeve position inspection system comprising: a camera that photographs the installation position of a sleeve installed at a construction site; an image display means that overlays and displays an AR image of the sleeve position generated based on installation position information of the sleeve and the image photographed by the camera to identify the installation position of the sleeve installed at the construction site; and a sleeve attribute information comparison means that compares sleeve attribute information stored in the sleeve information storage means with sleeve attribute information obtained from the sleeve attribute information display means photographed by the camera.

2. 2. The sleeve position inspection system according to claim 1, wherein the attribute information of the sleeve includes at least one of application information, dimensional information, and usage information.

3. 2. The sleeve position inspection system according to claim 1, wherein the sleeve attribute information display means includes at least one of characters, figures, patterns, colors, bar codes, and QR codes (registered trademark).

4. 2. The sleeve position inspection system according to claim 1, wherein said image display means includes at least one of a display of a mobile terminal or a terminal connected via a communication line.

5. 2. The sleeve position inspection system according to claim 1, further comprising an AR measure for measuring a dimension within the image captured by the camera.

6. In the sleeve position inspection system described in claim 1, the sleeve identification ring comprises a fitting portion that fits into the outer peripheral surface of the sleeve end and a ring main body portion having a predetermined radial width exposed on the surface side of the sleeve end face, and the sleeve attribute information display means is provided on the surface of the ring main body.

7. 2. The sleeve position inspection system according to claim 1, wherein the sleeve identification ring is made of plastic, rubber, metal, or paper.

8. 2. The sleeve position inspection system according to claim 1, wherein the sleeve identification ring is formed from a coating material applied to the surface of the end of the sleeve, and the coating material also serves as the sleeve attribute information display means.

9. A sleeve identification ring that is attached to the end of a sleeve that is attached to a steel reinforced concrete structure before concrete is poured in a reinforced concrete building, and displays the attributes of the sleeve, comprising a fitting portion that fits into the end of the sleeve, and a ring main body portion having a predetermined radial width exposed on the surface side of the sleeve end face, and wherein the sleeve attribute information display means is provided on the surface of the ring main body.

10. 10. The sleeve identification ring according to claim 9, wherein the ring body has a predetermined width in the radial inward direction and / or outward direction of the sleeve end.

11. 11. The sleeve identification ring according to claim 9, wherein the fitting portion and the ring body are made of plastic, rubber, metal or paper.

12. A sleeve position inspection method for confirming that sleeves are installed in a reinforcing steel structure of an RC building before concrete is poured in accordance with a sleeve installation plan, the method comprising the following steps. (1) A process of writing out the installation position and attribute information of the sleeve from the sleeve installation plan in an IFC common format and attaching it to a sleeve identification ring attached to the sleeve. (2) A process of numbering the sleeves, creating a database including the dimensions, use, affiliation, location information, etc. of each sleeve, and linking the database to the sleeves on the drawing data of the sleeve installation plan. (3) A process of aligning a reference point of the reinforced concrete structure before concrete is poured with a reference point on the AR model of the reinforced concrete structure. (4) A process of AR projecting the AR model of the reinforcing steel structure onto a display of a mobile terminal to display the position of the sleeve to be inspected. (5) A process of photographing the inspection area of ​​the reinforcing steel structure in which the sleeve to be inspected is installed using a camera equipped on the mobile terminal. (6) A process of extracting and recognizing the shape, etc. of the inspection target sleeve having a sleeve identification ring installed from an image captured by a camera of the mobile terminal using image recognition technology provided in the sleeve attribute information matching means, and comparing it with an AR model of the reinforced concrete structure to confirm the presence or absence, position, and consistency of attribute information (use, etc.) of the sleeve.

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