JP6292895B2 - Pipe survey device - Google Patents

Description

  The present invention relates to a pipe survey device that investigates internal and external surface corrosion of a buried pipe from the inside of the pipe.

  Buried pipes buried in roads, such as water and sewage pipes and gas pipes, are aging. In particular, external corrosion of buried pipes is greatly affected by the soil. In order to replace the new pipe, it is necessary to dig up the buried pipe and inspect it, but this requires a great deal of labor. As a countermeasure, for example, it is conceivable to investigate by inserting an in-pipe investigation apparatus as shown in Patent Document 1 into an embedded pipe.

  The investigation device is provided with a wheel that rolls on the inner surface of the pipe via three arms extending in the radial direction from the support ring, and a plurality of warp shapes that are spread and urged to the front end portion and the rear end portion of the support ring, respectively. A member is provided to slide the inner surface of the tube, and the support ring is held in a posture along the tube axis. An investigation device such as a television camera is provided in the support ring.

Japanese Utility Model Publication No. 5-20964

  However, the support ring incorporating the investigation device has a sufficient outer diameter, and it is necessary to form a sufficiently large opening in the buried pipe for insertion into the buried pipe. It was necessary to stop liquid transportation and disassemble the joint, or to form a sufficiently large opening at a predetermined position.

  The present invention solves the above-mentioned problems, and the investigation device can be inserted into and taken out from a small-diameter pipe portion such as an air valve or a fire hydrant sufficiently smaller than the main pipe, and the corrosion of the main pipe can be investigated from the inside. The purpose is to provide a pipe survey device.

The invention described in claim 1
A guide cable is stretched along the main pipe between a plurality of small-diameter pipe portions branched from the main pipe and having a diameter smaller than that of the main pipe, and the investigation apparatus main body is interposed in the guide cable so that the investigation apparatus main body has a small diameter. A pipe surveying device for investigating the main pipe by inserting it into the main pipe from the pipe section and moving it along the main pipe.
In the investigation apparatus main body, the sensor support body and the centering body are linearly connected along the axial direction of the main body, and these connection portions can be bent.
The centering body has a plurality of centering arms that are openable and closable between a storage posture along the main body axis and a deployment posture extending radially in a plane orthogonal to the main body axis,
The sensor support is supported so as to be openable and closable between a storage posture along the main body axis and a deployed posture extending in a radial direction within a plane orthogonal to the main body axis, and is capable of pivoting around the main body axis. An arm, an expansion / contraction mechanism that is provided on the sensor support arm and biases the free end portion in a protruding direction, and an inspection unit that is provided on the free end portion of the sensor support arm,
The surveying device main body is inserted by inserting the surveying device main body from the small-diameter pipe portion with the centering arm and the sensor support arm in the stowed posture, and bending the centering body and the sensor support body via the connecting portion. By inserting into the main pipe and deploying the centering arm and the sensor support arm to the deployed posture, the main body axis and the tube axis are substantially aligned, and the sensor support arm is pivoted to rotate the inspection unit. The tube wall of the buried pipe is inspected from the inside.

The invention according to claim 2 is the configuration according to claim 1,
At least two centering bodies are arranged at the front and back, and a sensor support is arranged between the front and rear centering bodies.

According to a third aspect of the present invention, the centering arm is provided with a telescopic mechanism that can extend and retract the centering arm within a predetermined range, and a sliding member capable of sliding the inner surface of the main pipe is provided at the free end of the centering arm. ,
The centering body is provided with an arm opening / closing device capable of opening and closing the centering arm between a housing posture and a deployed posture.

The invention according to claim 4 is the configuration according to any one of claims 1 to 3,
The small-diameter pipe portion is an air valve or a fire hydrant.

According to the first aspect of the present invention, the outer diameter of the investigation apparatus main body can be reduced by setting the centering arm and the sensor support arm to the retracted posture, and inserted into the main pipe from the small diameter pipe portion. Can do. Further, since the centering body and the sensor support body can be bent, the centering body and the sensor support body can be easily inserted into the main pipe from the small diameter pipe portion. Furthermore, by setting the centering arm and the sensor support arm to the deployed posture, the investigation device main body can be held at the substantially axial center position of the main tube, and by rotating the sensor support arm, the inspection unit is moved to the main tube The tube can be accurately investigated by swiveling along the inner surface. In addition, obstacles protruding from the inner surface of the main pipe can be easily overcome by the extension / contraction mechanism provided in the sensor support arm.

  According to the second aspect of the present invention, the sensor support can be stably held in the vicinity of the tube axis by connecting and arranging the sensor support between the two centering bodies. Stable survey results can be obtained.

  According to the third aspect of the invention, since the centering arm is provided with the expansion / contraction mechanism, the sliding member can be reliably brought into contact with the inner peripheral surface of the pipe to stably hold the investigation apparatus main body at the pipe axis position. Even if there are protrusions or steps on the inner surface of the tube, it can be easily overcome.

  According to invention of Claim 4, an embedded water pipe can be investigated easily by using an air valve or a fire hydrant as a small diameter pipe part.

It is side surface fragmentary sectional view which shows the Example of the pipe | tube investigation apparatus which concerns on this invention. It is AA sectional drawing shown in FIG. It is BB sectional drawing shown in FIG. It is side surface sectional drawing of a sensor support body. It is a side surface fragmentary sectional view of the front centering body. It is side surface partial sectional drawing of the back centering body. (A) and (b) show members for reducing wear of the sensor, (a) shows a wear reduction block, and (b) shows a wear reduction bearing. It is explanatory drawing 1 which shows the insertion operation | movement from an air valve in a buried pipe. It is explanatory drawing 2 which shows the insertion operation from an air valve in a buried pipe. It is explanatory drawing which shows the insertion completion state in an embedment pipe. It is explanatory drawing which shows the sensor support arm expansion | deployment operation | movement within an embedment pipe. It is explanatory drawing which shows the test | inspection state in a buried pipe. It is explanatory drawing which shows collection | recovery operation | movement from an embedment pipe to an air valve.

[Example 1]
Hereinafter, Example 1 of the pipe survey device according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the investigation apparatus main body 11 includes a plurality of centering arms 15 </ b> F and 15 </ b> R, for example, one front and rear centering bodies 12 </ b> F and 12 </ b> R, and front and rear cores. And a sensor support 13 having a plurality (or a single) of sensor support arms 22 interposed between the take-out bodies 12F and 12R. The front centering body 12F, the sensor support body 13, and the rear centering body 12R are connected in series along the body axis Os in series via the front and rear connecting portions 14F and 14R, and around the axes parallel to each other. Are connected to bendable.

(Sensor support)
As shown in FIGS. 2 and 4, the sensor support 13 includes a central rod portion 21 disposed along the direction of the main body axis Os, and a tangential direction with respect to the main body axis Os on the front side of the central rod portion 21. A pair of sensor support arms 22 provided to be openable and closable around the deployment axis of the sensor, a sensor arm opening and closing device 23 for driving the sensor support arms 22 to open and close, and driving the sensor support arms 22 to rotate around the body axis Os. And a sensor (inspection unit) 26 provided at the free end of the sensor support arm 22 via a support pin 25 in a tangential direction with respect to the main body axis Os. Yes.

  That is, a sensor turning motor 31 with a reduction gear of the sensor arm turning device 24 is externally supported by the front end side of the center rod portion 21, and the turning that loosely fits the center rod portion 21 on the output shaft cylinder of the sensor turning motor 31. A housing 32 is attached. Arm support portions 33 project from the revolving housing 32 at symmetrical positions, and the fixed end portions of the sensor support arms 22 are rotatably supported by the arm support portions 33 via tangential support shafts 34, respectively. .

  The sensor arm opening / closing device 23 is constituted by a gear type opening / closing mechanism. That is, the arm opening / closing motor 35 with a speed reducer fixed to the rear end portion of the swing housing 32 and loosely fitted to the center rod portion 21, and the arm opening / closing motor 35 loosely fitted to the center rod portion 21 within the swing housing 32. A worm gear 36 that is rotationally driven and a worm wheel 37 that is formed on the outer periphery of the fixed end of the sensor support arm 22 are provided. The worm gear 36 and the worm wheel 37 are meshed with each other through an opening 32 a formed between the arm support portions 33 of the revolving housing 32.

  Therefore, the worm gear 36 is rotationally driven by the arm opening / closing motor 35 of the sensor arm opening / closing device 23, and the sensor support arm 22 is moved through the worm wheel 37 with respect to the storage posture (A) along the central rod portion 21 and the support rod 21. It can be opened and closed with a deployment posture (b) extending in the radial direction at a distance of 90 °.

  Each sensor support arm 22 includes an expansion / contraction mechanism 29 that can overcome an obstacle protruding from the inner surface of the buried pipe (main pipe) P. That is, in the telescopic mechanism 29, the inner cylinder part 29b is slidably fitted to the free end side from the outer cylinder part 29a of the sensor support arm 22, and a long hole 29c along the length direction is formed in the inner cylinder part 29b. Is formed. The restriction pin 29d protruding into the outer cylinder portion 29a is fitted into the elongated hole 29c, thereby restricting the retracting stroke of the inner cylinder portion 29b. Further, a biasing spring 29e that biases the inner cylinder portion 29b in the protruding direction is inserted in the outer cylinder portion 29a on the fixed end side of the inner cylinder portion 29b. By means of the expansion / contraction mechanism 29 of the sensor support arm 22, for example, when the sensor support 13 is located at the tube axis Op, the sensor 26 is disposed so as to be retractable within a range of 0 to 30 mm in contact with the inner surface of the buried tube P, for example. As a result, the sensor support 13 contracts the sensor support arm 22 even if the sensor support 13 is displaced from the tube axis Op or an obstacle protrudes from the inner surface of the buried tube P. You can get over.

  The sensor 26 is not particularly limited as long as it is a small sensor that detects changes in the thickness, wear, and damage of the pipe wall of the buried pipe P. Here, for example, an eddy current type flaw detection sensor is used. The Further, an ultrasonic sensor may be used instead of the flaw detection sensor.

  Here, since the sensor 26 has a predetermined length, the sensor 26 is supported on the free end portion of the sensor support arm 22 so as to be rotatable about the support pin 25 parallel to the support shaft 34. The sensor 26 is extended along the central rod portion 21, and is provided with a sensor posture adjusting tool 38 that bends the sensor 26 at a substantially right angle with respect to the sensor support arm 22 when deployed, as shown in FIG. With the adjustment tool 38, the detection surface 26a can be brought into a posture substantially parallel to the inner surface of the buried pipe P during deployment.

  For example, the sensor posture adjusting tool 38 is fitted on the support pin 25 to bias the sensor 26 in the deploying direction of the sensor support arm 22 and the sensor 26 from a position where the sensor 26 extends in the length direction of the sensor support arm 22. It is comprised with the stopper part 38b which controls front rotation. As a result, when the sensor support arm 22 is deployed from the stowed position and the free end of the sensor 26 abuts against the inner surface of the buried pipe P, the sensor 26 is bent around the support pin 25 against the coil spring 38a. The detection surface 26a can be made to face the inner surface of the buried pipe P.

  Further, as shown in FIG. 7, a wear reduction block 27 and a wear reduction bearing 28 may be attached to the detection surface 26 a of the sensor 26 in order to prevent wear when sliding in contact with the inner surface of the buried pipe P.

(Front centering body, front connecting part)
As shown in FIG. 5, the front centering body 12F includes a front centering housing 41 that is foldably connected to the sensor support body 13 via a front connection portion 14F, and the front centering housing 41 and the like. There are provided three front centering arms 15F that are supported at every angle, for example, 120 °, and can be opened and closed, and a centering arm opening / closing device 40 that opens and closes these front centering arms 15F.

  The front connecting portion 14F includes a connecting bracket 14a provided at the front end portion of the center rod portion 21 and a centering bracket 14b provided at the rear end portion of the centering housing 41 of the front connecting portion 14F via a connecting pin 14c. They are connected so as to be foldable within a predetermined range (for example, within ± 90 ° with respect to the body axis Os).

  In the centering housing 41, a pair of three arm support portions 44 that rotatably support the fixed end of the centering arm 15F via a tangential support pin 43 are equiangular with respect to the circumferential direction, 120 °. It is provided for each.

  The centering arm opening / closing device 40 includes an opening 41a formed between the arm support portions 44 of the centering housing 41, a centering opening / closing motor 45 with a reduction gear fixed to the front portion of the centering housing 41, A worm gear 46 that is rotationally driven by a centering opening / closing motor 45 and a worm wheel 47 formed on the outer periphery of the fixed end of the front centering arm 15F are provided. The worm wheel 47 and the worm gear 46 are provided via an opening 41a. Are engaged.

  Accordingly, the worm gear 46 is rotationally driven by the centering opening / closing motor 45, and the front centering arm 15F is moved through the worm wheel 47, as shown in FIG. It can be opened and closed with respect to the open posture (d) extending in the radial direction with a spacing of 90 ° with respect to the axis Os.

  The front centering arm 15F is provided with an expansion / contraction mechanism 51 that can overcome an obstacle protruding from the inner surface of the buried pipe P. The expansion / contraction mechanism 51 of the front centering arm 15F is the same as the expansion / contraction mechanism 29 of the sensor support arm 22, and the inner cylinder part 51b is slidably fitted from the outer cylinder part 51a to the free end side, and the inner cylinder part 51b. A long hole 51c is formed along the length direction. The restriction pin 51d protruding into the outer cylinder part 51a is fitted into the elongated hole 51c, thereby restricting the retracting stroke of the inner cylinder part 51b. Further, a biasing spring 51e that biases the inner cylinder portion 51b in the protruding direction is inserted into the outer cylinder portion 51a on the fixed end side of the inner cylinder portion 51b. This expansion / contraction mechanism 51 has a variation in the inner diameter of the buried pipe P. For example, the expansion / contraction distance is selected and set in a range of 0 mm to 40 mm corresponding to the inner diameter of the buried pipe P.

  A sled member (sliding member) 50 is rotatably supported by a hinge portion 48 provided at the free end portion of the front centering arm 15F via a support pin 49 in a tangential direction with respect to the body axis Os. Yes. By this sled member 50, the inside of the buried pipe P can be smoothly moved over a step or a recess such as a joint formed on the inner surface of the buried pipe P.

(Rear centering body, rear connecting part)
Since the rear centering body 12R and the rear connection part 14R have a symmetrical structure with the front centering body 12F and the front connection part 14F, the same reference numerals are given to simplify the description.

  As shown in FIG. 6, the rear centering body 12 </ b> R has a centering housing 41 that is foldably connected to the sensor support body 13 via the rear connection portion 14 </ b> R, and the rear centering housing 41. 3 rear centering arms 15R supported and opened at equal angles with respect to the direction, for example, every 120 °, and a centering arm opening / closing device 40 for opening and closing the subsequent centering arms 15R. ing.

  The rear centering arm opening / closing device 40 is configured in the same manner as the front centering arm opening / closing device 40, and the rear centering arm 15R includes an extension mechanism 51 similar to the front centering arm 15F. ing.

  The rear connection portion 14R includes a connection bracket 14a attached to the rear end portion of the center rod portion 21, and a centering bracket 14b provided at the front end portion of the centering housing 41 of the rear connection portion 14R via a connection pin 14c. They are connected so as to be foldable within a predetermined range (for example, within ± 90 ° with respect to the body axis Os).

  The front connecting part 14F and the rear connecting part 14R are connected by the central rod part 21, and the two connecting pins 14c are arranged in parallel to each other, so that the front and rear centering bodies 12F, 12R are Folded around parallel axes.

  Here, the outer diameter of the investigation apparatus main body 11 in which the front and rear centering arms 15F and 15R and the sensor support arm 22 are in the storage posture (c) (a) is an outer diameter that can pass through an air valve that is a small-diameter pipe (for example, Less than 75 mm).

(how to use)
Next, with reference to FIGS. 8 to 13, the investigation work of the buried pipe P will be described.
1) The survey area is a section of two air valves V1 and V2 (or between two fire hydrants, or between an air valve and a fire hydrant), which are small-diameter pipes attached via a flange provided in the buried pipe P. . Here, for example, the inner diameter of the air valve is generally 75 mm. A tow wire (guide cable) Wf fed out from the tow winch drum WD is taken out from the other air valve V2 into the one air valve V1 through the buried pipe P, and the tow wire Wf is connected to the front portion of the investigation apparatus main body 11. Connect to A guide wire (guide cable) Wr (composite of a pulling wire and an electrical cable) fed from the feeding winch drum WF is connected to the rear part of the investigation apparatus main body 11.

  2) As shown in FIG. 8, the investigation apparatus main body 11 in which the front and rear centering arms 15F and 15R and the sensor support arm 22 are in the storage posture (C) (A) is inserted into the buried pipe P from one air valve V1. insert. At this time, the traction wire Wf is gradually wound around the traction winch drum WD, the guide wire Wr is fed out from the feeding winch drum WF, and the previous centering body 12F is inserted into the buried pipe P from the air valve V1. By gradually pulling to one air valve V2 side, as shown in FIG. 9, first the front connecting portion 14F is bent, and then the rear connecting portion 14R is bent to bend the investigation apparatus main body 11 into the buried pipe P. As shown in FIG. 10, it returns to a straight posture in the buried pipe P. The buried pipe P to be investigated may be in a state with or without a fluid such as water.

  3) The centering arm opening / closing device 40 of the front and rear centering bodies 12F, 12R is driven by the centering opening / closing motor 45 to rotate the worm gear 46, and the front and rear centering arms 15F, 15R are stored via the worm wheel 47. Deploy from posture (c) to deployment posture (d). As a result, the sled members 50 of the front and rear centering arms 15F and 15R are brought into contact with the inner surface of the buried pipe P, respectively, so that the main body axis Os of the investigation apparatus main body 11 substantially coincides with the pipe axis Op.

  4) Next, the arm opening / closing motor 35 is driven by the sensor arm opening / closing device 23 of the sensor support 13, and the sensor support arm 22 is expanded from the retracted position (A) to the expanded position (B) via the worm gear 36 and the worm wheel 37. To do. Then, as shown in FIG. 11, the sensor 26 in contact with the inner surface of the buried pipe P swings, and the detection surface 26 a faces the inner surface of the buried pipe P. Here, it is desirable to hold the sensor 26 within 20 mm from the inner surface of the buried pipe P, thereby enabling highly accurate investigation.

  5) Further, the sensor turning motor 31 is driven by the sensor arm turning device 24, and the sensor support arm 22 is turned through the turning housing 32, and the state of the tube wall is sensed from the inside of the buried pipe P by the sensor 26. Further, the tow wire Wf is wound around the tow wire drum WD and the investigation apparatus main body 11 is advanced. The sensed data is displayed on a display device (not shown) of an inspection control device installed outside via the guide cable Wr or stored in a memory.

  6) When the investigation apparatus main body 11 reaches the other air valve V2, as shown in FIG. 13, the sensor arm turning device 24 is stopped and the sensing is stopped, and the sensor support arm 22 is closed by the sensor arm opening / closing device 23. Move to the storage position (I). Further, the front and rear centering arms 15F and 15R are closed by the centering arm opening / closing device 40 to the storage posture (c). Further, the traction wire Wf is wound up by the traction wire drum WD, and the rear connection portion 14R is bent and introduced into the air valve V2 sequentially from the front connection portion 14F, and the investigation apparatus main body 11 is taken out from the air valve V2.

(Effect of Example 1)
According to the first embodiment, the outer diameter of the investigation apparatus main body 11 can be reduced by setting the front and rear centering arms 15F and 15R and the sensor support arm 22 to the storage posture. As a result, the investigation apparatus main body 11 can easily pass from the small-diameter pipe portion having a small inner diameter such as the air valves V1, V2 and the fire hydrant to the large-diameter buried pipe P. Further, since the front and rear centering bodies 12F and 12R and the sensor support 13 can be bent via the front and rear connecting portions 14F and 14R, the investigation apparatus main body 11 that has passed through the air valve V1 is inserted into the buried pipe P. Sometimes it can be easily inserted. Further, by expanding the front and rear centering arms 15F and 15R and the sensor support arm 22 in the open posture, the investigation device main body 11 is held near the tube axis Op position, and the sensor support arm 22 is rotated. The sensor 26 is swung along the inner surface of the buried pipe P, so that the buried pipe P can be investigated with high accuracy. In this way, by using the air valves V1 and V2 and the fire hydrants that are installed in the buried pipe P and have small diameters, the joints can be disassembled or a sufficiently large opening can be formed at a predetermined position. The buried pipe P can be easily investigated from the inside.

  Further, the sensor support 13 can be stably held in the vicinity of the tube axis Op position by connecting and arranging the centering body 12F, the sensor support 13 and the centering body 12R in this order. Survey results can be obtained.

  When the front centering arm 15F or the rear centering arm 15R is deployed from the stowed position (c) to the deployed position (d), the centering opening / closing motor 45 rotates and is connected to the centering opening / closing motor 45. Along with the rotation of the worm wheel 47, a turning moment (reaction force) is generated to rotate the investigation apparatus main body 11 in the direction opposite to the rotation direction thereof. When the investigation apparatus main body 11 rotates in the buried pipe P due to this moment, there is a possibility that inconveniences such as twisting of the pulling wire Wf and the guide wire Wr may occur. However, as shown in FIG. 1, the front centering body 12F and the rear centering body 12R are arranged in opposite directions, and the front centering arm 15F and the rear centering arm 15R are deployed from the stowed position (c). By simultaneously developing the posture (d), the rotation of the front centering opening / closing motor 45 and the rotation direction of the front worm wheel 47 connected thereto, the rotation of the rear centering opening / closing motor 45, and Since the direction of the rotation of the connected worm wheel 47 can be different, the turning moments generated by the rotation of the two cancel each other, so the above-mentioned inconvenience can be prevented.

  Furthermore, the expansion / contraction mechanism 51 provided in the centering arm 15 can reliably hold the investigation device main body 11 by bringing the sled member 50 into contact with the inner surface of the buried pipe P, and the inner surface of the buried pipe P is obstructed. Even if there is a step or recess in the object or the joint, it can easily get over and move smoothly in the buried pipe P.

  Furthermore, since the center rod portion 21 is passed through the sensor support 13 and the front and rear end portions of the center rod portion 21 are connected to the front and rear connection portions 12F and 12R, the bending axes of the front and rear connection portions 12F and 12R are parallel to each other. Thus, the insertion and removal between the air valves V1, V2 and the buried pipe P can be performed smoothly.

  The center rod portion 21 is connected to the front and rear centering arms 15F and 15R via the front and rear connecting portions 12F and 12R, and the center rod portion 21 and the casing of the sensor turning motor 31 are connected and fixed. Can be supported via the front and rear centering arms 15F and 15R, and the sensor support arm 22 can be smoothly turned.

  In the above embodiment, the centering body 12F, the sensor support body 13 and the centering body 12R are connected via the front and rear connecting portions 14F and 14R. However, three or more centering bodies may be provided or a plurality of sensor support bodies 13 may be provided. Can also be provided.

Further, by attaching a projector and an imaging device to the front part or the rear part of the investigation apparatus main body 11, the corrosion investigation can be performed while observing the corrosion state of the inner surface of the buried pipe P.
Furthermore, when the investigation is performed in water in the buried pipe P, in order to stabilize the investigation apparatus main body 11, stabilizing blades may be provided on the sensor support 13 and the front and rear centering arms 15F and 15R.

  When investigating underwater etc. in the buried pipe P, a buoyant body having a size that does not hinder the insertion from the air valves V1, V2, etc. is arranged at an appropriate location on the investigation apparatus main body 11. The operation and movement of the investigation apparatus main body 11 in water can be made easier.

  In the first embodiment, two sensor support arms 22 are provided and the sensor 26 is attached to each free end. However, the number of sensor support arms 22 is not limited to two, but three or more. May be. Further, if the sensor support arm 22 is configured so as not to interfere with the turning of the sensor support arm 22, the number of sensor support arms 22 may be one.

  Furthermore, a plurality of different types of data can be obtained almost simultaneously by attaching different types of sensors to the same sensor support arm, or attaching different types of sensors to different sensor support arms 22, respectively.

11 Investigation device body 12F Centering body 12R Front centering body 13R Rear centering body 13 Sensor support 14F Front connection portion 14R Rear connection portion 15F Front centering arm 15R Rear centering arm 21 Center rod portion 22 Sensor support arm 23 Sensor Arm opening / closing device 24 Sensor arm turning device 25 Support pin 26 Sensor 29 Telescopic mechanism 40 Centering arm opening / closing device 49 Support pin 50 Sled member 51 Telescopic mechanism Os Main body axis Op Embedded pipe axis P Embedded pipe (main pipe)
V1, V2 Air valve (small diameter pipe)
Wf Towing wire (guide cable)
Wr guide wire (guide cable)

Claims (4)

A guide cable is stretched along the main pipe between a plurality of small-diameter pipe portions branched from the main pipe and having a diameter smaller than that of the main pipe, and the investigation apparatus main body is interposed in the guide cable so that the investigation apparatus main body has a small diameter. A pipe surveying device for investigating the main pipe by inserting it into the main pipe from the pipe section and moving it along the main pipe.
In the investigation apparatus main body, the sensor support body and the centering body are linearly connected along the axial direction of the main body, and these connection portions can be bent.
The centering body has a plurality of centering arms that are openable and closable between a storage posture along the main body axis and a deployment posture extending radially in a plane orthogonal to the main body axis,
The sensor support is supported so as to be openable and closable between a storage posture along the main body axis and a deployed posture extending in a radial direction within a plane orthogonal to the main body axis, and is capable of pivoting around the main body axis. An arm, an expansion / contraction mechanism that is provided on the sensor support arm and biases the free end portion in a protruding direction, and an inspection unit that is provided on the free end portion of the sensor support arm,
The surveying device main body is inserted by inserting the surveying device main body from the small-diameter pipe portion with the centering arm and the sensor support arm in the stowed posture, and bending the centering body and the sensor support body via the connecting portion. By inserting into the main pipe and deploying the centering arm and the sensor support arm to the deployed posture, the main body axis and the tube axis are substantially aligned, and the sensor support arm is pivoted to rotate the inspection unit. A pipe survey device that inspects the pipe wall of the buried pipe from the inside. The tube surveying device according to claim 1, wherein at least two centering bodies are arranged at the front and rear, and a sensor support is arranged between the front and rear centering bodies. The centering arm is equipped with a telescopic mechanism that can extend and retract the centering arm within a predetermined range, and a sliding member that can slide the inner surface of the main pipe is provided at the free end of the centering arm.
The tube inspection device according to claim 1 or 2, wherein the centering body is provided with an arm opening and closing device capable of opening and closing the centering arm between a storage posture and a deployed posture. The pipe inspection device according to any one of claims 1 to 3, wherein the small-diameter pipe portion is an air valve or a fire hydrant.

Images