JP4427420B2 - State measuring method and state measuring device for existing pipeline - Google Patents

Description

  The present invention relates to a state measuring method and a state measuring device for an existing pipeline such as a sewer pipe buried in the ground, and in particular, the state of a gradient of an existing pipeline where sewage is flowing down during operation can be easily obtained. In addition, the present invention relates to a state measuring method and a state measuring apparatus that can accurately measure the state of a pipeline, the state of settlement, a meandering state, and the like.

  Pipelines such as sewage pipes are set to have a predetermined slope and no meandering when buried in the ground, but they are pressurized due to ground subsidence or running of large vehicles over time after being buried. Such as partial subsidence and meandering, and uplift occurs in some places. In sewage pipes, when undulations occur in the pipe, sediments that have flowed in can easily accumulate in the pipe, and if the sediment is left as it is, the sewage tends to overflow or a bad odor is generated. . Therefore, the inside of the pipeline is cleaned by periodically hesitating. In addition, when the pipeline has been deformed to a certain level or more, for example, the amount of change in the height direction has exceeded a certain value, and the function as the pipeline has been impaired, A new saddle-shaped invert member is installed at a normal gradient, or a pipe is dug up and newly installed.

  Conventionally, as this type of state measurement method, projecting the laser beam with the projection direction coincident with the standard gradient of the buried pipe from one side of the buried pipe to the other side, from the other side of the buried pipe toward the one side, A target for receiving the laser beam is provided at the front, and a camera device including a camera for visually recognizing the spot of the laser beam irradiated on the target is moved behind the target. At each moving position, there is a method for inspecting a pipe rod that measures the amount of undulation displacement from a standard gradient at each position in the longitudinal direction of the buried pipe by detecting the spot position on the target (for example, Patent Document 1).

JP 2001-304862 A

  By the way, the above-mentioned inspection method of the tube fist moves the camera device provided with the target and the camera in the buried tube, but the camera device moves while being in contact with the inner wall of the buried tube with four drive wheels, If there is a foreign substance in the buried pipe, the camera device cannot be moved smoothly, and if measurement is performed with the driving wheel riding on the foreign substance at the measurement point, there is a problem that accurate measurement cannot be performed. In addition, when the sewage is in use and the sinking is large, the camera device may be buried in the sewage, and the measurement itself may be disabled.

  The present invention has been made in view of such a problem, and the object of the present invention is to provide a state measurement method for an existing pipe line that can accurately measure the pipe line state such as partial undulation and subsidence. It is to provide. Also, the present invention provides a state measuring method and a state measuring device for an existing pipe line that can measure the state of an existing pipe line in a short time with high accuracy and efficiency even in service where so-called sewage such as rainwater and sewage flows down. It is in.

In order to achieve the above object, a state measuring device for an existing pipe line according to the present invention is a device for measuring a state of a sewer pipe or the like buried in the ground, and includes a main body portion and a vertical direction from the main body portion. A contact body elastically contacting the upper inner wall surface of the pipe line, and a scale fixed to the contact body, wherein the contact body is fixed to the main body portion via a vertical maintenance mechanism. To do. For example, the vertical maintaining mechanism is fixed to a first support plate fixed to be swingable with respect to a first axis along the longitudinal direction of the pipeline, and fixed to the support plate in a direction perpendicular to the first axis. And a second support plate fixed to the second shaft so as to be swingable. The first support plate and the second support plate are maintained in a horizontal state by a counterweight. The contact body is preferably fixed to the second support plate .

  As described above, existing pipelines such as sewer pipes are set to have a predetermined gradient and no meandering at the time of embedding, but partial uplift, subsidence and meandering occur as time passes after embedding. In the present invention, the state measurement of the existing pipe line is a state changed from the state at the time of burying, that is, the amount of change in the pipe height at the time of measurement due to partial subsidence or uplift, and the accompanying angle change (gradient change). Or measure the degree of meandering. The change in height and the accompanying gradient change are fluctuations in the pipe in the vertical direction, meandering is the fluctuation in the horizontal direction of the pipe, and the fluctuation may be in both the vertical and horizontal directions.

The apparatus for measuring a state of an existing pipe of the present invention configured as described above moves a main body part, for example, in a liquid and moves in the pipe, and elastically contacts the contact body with the upper wall surface of the pipe at a plurality of measurement points. Since the distance between the upper inner wall surface of the pipeline and the reference position is measured, the exact position of the pipeline can be measured. In addition, the measuring device can be quickly moved in the pipeline, and the measuring time can be shortened. The reference position is preferably a reference beam that is launched into the pipeline along a horizontal or predetermined gradient. The reference beam is projected onto the scale, and the scale and the projected position of the reference beam are read by the imaging device. Measure the distance from the reference beam to the upper inner wall surface.
Further, since the main body is fixed to the main body via a vertical maintenance mechanism, even when the main body of the measuring apparatus is inclined, the contact body can be brought into contact with the upper wall surface of the pipe vertically. The accuracy of position measurement can be improved.

  The distance is measured by installing a scale (scale) fixed to the contact body and an imaging device such as a video camera for photographing the scale in the measurement device, and projecting a reference beam projected on the scale. It is preferable to measure the distance between the upper inner wall surface of the pipe and the projection position based on the position and the numerical value of the scale. When the imaging device is used, the projection position of the reference beam projected on the scale is photographed by the imaging device, and the distance between the upper inner wall surface of the pipeline and the projection position of the reference beam is measured by a monitor installed on the ground, for example. Therefore, it is possible to measure the subsidence state, uplift state, meandering state, etc. at multiple measurement points of the pipeline, and by measuring multiple points at arbitrary intervals, the undulation state and gradient of the existing pipeline, The state of meandering can be measured accurately.

Furthermore, as another preferable specific aspect of the existing pipeline state measuring apparatus according to the present invention, the main body portion includes a central maintaining mechanism so as to align the main body portion with the central axis of the pipeline. It is a feature. The central maintaining mechanism preferably includes a contact that elastically contacts the both side walls of the pipe line from the main body. According to this configuration, since the measuring device is located at the center of the pipe, it is possible to measure the position of the uppermost point at the center of the pipe and to perform accurate position measurement at the measurement point of the pipe.

Condition measuring method of the existing pipe line according to the present invention is a method of measuring the state of the existing pipeline sewer or the like which is buried in the ground by using the measuring apparatus of the existing pipe described above, a predetermined Measuring the distance between the measurement position and the upper inner wall surface of the pipeline, and measuring the state of the pipeline by performing the measurement at a plurality of locations along the pipeline. Yes. Using the scale fixed to the contact body, the height of the upper inner wall surface of the pipeline is measured to measure the state of the existing pipeline. It is preferable that the main body floats with respect to liquid such as sewage.

In the method for measuring the state of an existing pipe line of the present invention configured as described above, the main body is floated on, for example, a liquid, moved in the pipe line, and the contact body is elastically contacted with the upper wall surface of the pipe line at a plurality of measurement points. The distance between the upper inner wall surface of the pipe and the reference position is measured, so that the exact position of the pipe can be measured. In addition, the measuring device can be quickly moved in the pipeline, and the measuring time can be shortened. The reference position is preferably a reference beam that is launched into the pipeline along a horizontal or predetermined gradient. The reference beam is projected onto the scale, and the scale and the projected position of the reference beam are read by the imaging device. Measure the distance from the reference beam to the upper inner wall surface.

  In the state measuring device, it is preferable to include a lifting device that lifts and lowers the contact body. According to this configuration, the contact body that is in elastic contact with the upper wall surface of the pipe at the time of measurement is lowered during the movement, so that the measurement device can be moved smoothly and the wear of the contact body can be prevented to perform accurate measurement for a long period of time. be able to.

Moreover, as another aspect of the state measurement method of the existing pipe line according to the present invention, the state of the existing pipe line such as a sewer pipe buried in the ground is measured using the above-described existing pipe state measurement device. The state measuring device is moved, a reference beam is emitted in a horizontal direction or along a predetermined gradient inside the pipe, and is projected onto a contact body that is elastically contacted with an upper inner wall surface of the pipe. By measuring the distance of the projected position of the reference beam in the left-right direction from the center of the contact body, and performing the measurement at a plurality of locations along the pipeline, the horizontal meandering state of the pipeline is determined. It is characterized by measuring.

As another preferred specific aspect of the method for measuring the state of an existing pipe line according to the present invention, the measuring device floats the main body portion on the liquid while a liquid such as sewage in service is flowing down. It is characterized by being moved. The measuring device is preferably moved from the upstream side to the downstream side, and can be moved using a rope or the like. According to this configuration, the measuring device can be floated and moved to a liquid such as rain water or sewage that is in service, or the liquid is dammed, and even if there is a deposit on the bottom of the pipe, It can move smoothly, measure the correct state and reduce the working time.

  According to the present invention, it has been a long time since it was buried in the ground, and when the height in the vertical direction of the existing pipeline fluctuates due to partial undulation or subsidence, the gradient changes, or partial Accurate and quick measurement of meandering state due to horizontal movement, can clearly express the necessity of restoration and calibration of existing pipes, and can be used as an efficient restoration and calibration document can do.

  Hereinafter, an embodiment of a state measurement method for an existing pipeline according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a measuring apparatus that performs a state measuring method for an existing pipeline according to the present embodiment, FIG. 2 is a plan view of FIG. 1, and FIG. FIG. 5 is a plan view of FIG. 4, FIG. 6 is a cross-sectional view of the main part along the line AA in FIG. 4, and FIG. 7 is a BB line of FIG. 8 is a cross-sectional view showing in detail the portion C in FIG. 6, and FIG. 9 is a cross-sectional view along the line DD in FIG.

  First, with reference to FIGS. 1-3, the measuring apparatus D used with the state measuring method of the existing pipe line is demonstrated. The measuring apparatus D includes a main body 1 that floats on a liquid, for example, a liquid such as sewage in service. The main body 1 has a shape in which both end portions of a pipe-shaped tube body are closed by the tip portions 2 and 2. The tip of the heel has a sharp tip so that the main body 1 can move through the liquid with little resistance. The main body portion 1 and the tip portions 2 and 2 are formed of a metal plate material, a plastic material, or the like, and the connection portions are in close contact so as not to leak water. The measuring device D is set to a size that can be easily inserted from a manhole installed in a normal pipe such as a sewage pipe. In this embodiment, the total length in the longitudinal direction is set to about 60 cm.

  Below the main body 1, two wing-shaped sliders 3 and 3 are fixed along the X-axis which is the central axis direction of the pipe line. Hereinafter, the horizontal direction perpendicular to the X axis is referred to as the Y axis, and the vertical direction is referred to as the Z axis. The sliders 3 and 3 are formed of a metal plate material or resin, and are fixed so as to protrude in a 45-degree direction below the main body 1. The sliders 3 and 3 are fixed to the main body 1 by screws or the like. The slider floats the main body 1 of the measuring device D from the bottom surface of the pipe P. During the movement of the measuring device, the slider floats from the bottom surface of the pipe when the liquid level is high, and the bottom surface of the pipe when the liquid level is low. It works like a sled when in contact with to facilitate movement. It is preferable that the slider can be exchanged according to the diameter of the pipe line. That is, when the diameter of the pipeline P is large, the position of the pipeline can be measured by raising the position of the measuring device D by using a slider having a large height.

  The main body 1 preferably has a shape that can flow smoothly with a liquid such as sewage flowing down, and a shape that can be stopped in a stable state during measurement. That is, it is preferable to have a boat shape that can smoothly move to a plurality of measurement points and can stop at the measurement points without opposing the liquid flow. In particular, when the tip of the main body is on one side and the flow rate of sewage or the like in service is large, the tip is preferably directed upstream. By using a hull-shaped main body, the flowing liquid has a faster central flow rate and is slower toward the periphery. Therefore, the main body 1 is flowed along the center line of the pipe P, and along the center line of the pipe at the time of measurement. And stable.

  Next, the inside of the main body will be described in detail with reference to FIGS. The upper portion of the central tube body is opened in the main body portion 1, and a mechanism portion for measuring the state of the pipeline is installed inside the opening portion 4. Inside the main body 1, two support plates 5, 5 are fixed in a horizontal direction with an interval between the front and rear in the X-axis direction of the opening 4. Bearings 6 and 6 are fixed at the center of the direction. On the other hand, a substrate 10 having a rectangular outer shape is located between the opposing support plates 5 and 5. A mounting hole 11 is formed in the center of the substrate 10. The substrate 10 is fixed with bearings 12 and 12 facing the bearings 6 and 6 of the support plate. The support shafts 13 and 13 are fixed along the central axis direction X so as to penetrate both the bearings 6 and 12. Thus, the substrate 10 is supported by the support shafts 13 and 13 so as to be swingable around the X axis.

  Support shafts 13 and 13 between the bearings 6 and 6 and the bearings 12 and 12 are connected with weight support plates 14 and 14 downward, and a cylindrical balance weight 15 is fixed between the weight support plates. Yes. The balance weight 15 allows the substrate 10 supported so as to be swingable between the support shafts 13 and 13 to be maintained in a horizontal state around the X axis. Therefore, the substrate 10 is configured to maintain a horizontal state even when the main body portion is slightly inclined when viewed from the cross-sectional direction in which the pipe is cut into a circle.

  The scale mounting plate 20 is located in the mounting hole 11 of the substrate 10 with a gap. The substrate 10 and the scale mounting plate 20 are arranged so that their upper surfaces coincide with each other, the bearings 16 and 16 fixed to the substrate 10 in the Y-axis direction, and the scale mounting plate 20 so as to face these bearings. A support shaft 22 is fixed between the bearings 21 and 21 fixed to the shaft. With this configuration, the scale mounting plate 20 is supported in the mounting hole 11 of the substrate 10 so as to be swingable about the Y axis.

  The main body 1 floating in a liquid such as sewage in service is provided with a contact body 30 that protrudes upward from the opening 4 and elastically contacts the upper inner wall surface above the pipe line. The contact body 30 is fixed vertically to the scale mounting plate 20, and the scale mounting plate 20 is fixed to the main body 1 via a horizontal maintenance mechanism. Thereby, the contact body 30 is maintained in a vertical state. The horizontal maintaining mechanism includes a substrate 10 supported via support shafts 13 and 13 between support plates 5 and 5 of the main body 1 and a scale mounting plate 20 supported by the substrate 10 via a support shaft 22. Composed.

  A contact body 30 that protrudes upward from the opening 4 and contacts the upper wall surface of the pipe is fixed to the upper surface of the scale mounting plate 20. A cylindrical balance weight 23 is fixed to the lower surface of the scale mounting plate 20 via weight support plates 24 and 24. The balance weight 23 has a left and right uniform length with respect to the central axis parallel to the central axis direction X. The balance weight 23 is balanced with the contact body 30 with respect to the support shaft 22, and the scale mounting plate 20 is configured so as to be maintained in a horizontal state even when the main body 1 is slightly inclined. Yes. The contact body 30 fixed vertically to the scale mounting plate 20 is configured to stand upright in the vertical direction. Thus, the contact body 30 is fixed to the scale mounting plate 20, and the scale mounting plate 20 is supported on the substrate 10 by the support shaft 22, and is kept horizontal around the Y axis by the balance weight 23, and the substrate 10 is supported. The plates 5 and 5 are supported by support shafts 13 and 13 and are maintained in a horizontal state around the X axis by the balance weight 15, and these constitute a vertical maintaining mechanism for the contact body 30.

  Here, the contact body 30 fixed to the scale mounting plate 20 at a right angle will be described in detail. As described above, the contact body 30 is in elastic contact with the upper inner wall surface of the pipe, and includes a scale 31 having a dimension. The contact body 30 basically has a structure in which the outer peripheral pipe portion 32 and the inner peripheral shaft 33 are movably fitted, and the outer peripheral pipe portion 32 is fixed to the scale mounting plate 20 via a fixed washer 34. . The fixed washer 34 has a ring shape, and the scale mounting plate 20 inside the fixed washer has an opening therethrough. The outer peripheral pipe part 32 is fixed to the fixed washer 34 with a fixing screw 35, and the outer peripheral pipe part 32 can be moved up and down by loosening the fixing screw 35 penetrating in the horizontal direction.

  A cap portion 36 is fixed to the lower end of the outer peripheral pipe portion 32, and an adjustment screw 37 is supported through the center of the cap portion. An adjusting body 38 is screwed into the adjusting screw 37 in the outer peripheral pipe portion 32, and a compression spring 39 is mounted between the adjusting body and the lower end of the inner peripheral shaft 33. The inner peripheral shaft 33 is urged upward in the outer peripheral pipe portion 32 by the compression spring 39, and the compression spring 39 is moved up and down by turning the bolt 37 a at the lower end of the adjustment screw 37. The pressing force can be adjusted. The lower end of the inner peripheral shaft 33 is formed with a large-diameter enlarged portion 33a, and the upper cap portion 36a fixed to the upper end of the outer peripheral pipe portion 32 is prevented from escaping to the outside.

  A compression spring 40 is wound around the outer periphery of the inner peripheral shaft 33 to press the inner peripheral shaft 33 downward. As a result, the inner peripheral shaft 33 is biased upward by the differential pressure between the compression spring 39 and the compression spring 40, and extends from the main body 1 in the vertical direction Z with a predetermined pressing force. It is configured to issue. A contact piece 41 is screwed to the upper end of the inner peripheral shaft 33. This contact piece elastically contacts the inner wall above the existing pipeline P. The contact piece 41 has a top surface formed as a part of a spherical surface or a part of a cylindrical surface and a surface with rounded edges at the front and rear ends.

  The scale 31 engraved on the inner peripheral shaft 33 is engraved with an interval of, for example, 10 mm, and the distance from the contact piece 41 at the upper end is displayed. The position displayed as “50” is a position 50 mm from the upper end, and the position displayed as “100” is a position 100 mm from the upper end. The display is not limited to the distance from the upper end. For example, the middle point is “0”, “+10”, “+20”, etc. are displayed upward, and “−10”, “−20” are displayed downward. … May be displayed. Note that the scale is not directly engraved, and may be one in which a plate material such as a ruler is fixed.

  The substrate (first support plate) 10 is supported by two support shafts (first shafts) 13 and 13 so as to be swingable with respect to the X-axis direction, and the scale mounting plate (second support plate) 20 is Since the substrate 10 is supported by the shaft (second shaft) 22 so as to be swingable with respect to the Y-axis direction, the main body 1 of the measuring device D is changed depending on the state of the pipeline and the state of the deposit. It is configured to maintain a horizontal state even in an inclined state. Therefore, the contact body 30 protruding upward from the scale mounting plate 20 at a right angle is configured to maintain a vertical state.

  As described above, the main body portion 1 has a pipe shape at the center, and the tip portions 2 and 2 are fixed so as to close the openings at both ends. As shown in FIGS. 1 to 3, a camera device 45 such as a video camera is fixed to the upper portion of the tip portion. A pedestal 47 is fixed to a fixed shaft 46 erected in a vertical direction from the tip portion so as to be movable up and down, and the camera device 45 is fixed to the pedestal via a ball joint 48. Therefore, the shooting range can be moved up and down by moving the camera device 45 up and down along the fixed shaft 46, and the shooting range can be freely changed by turning the camera device 45 up and down and left and right by the ball joint 48. Can do. The camera device 45 has a shooting range set so that the scale 31 formed on the contact body 30 is shot. Note that the imaging apparatus may be a digital camera or an optical camera.

  On both sides of the outer periphery of the main body 1, there are provided central maintenance mechanisms 50, 50 for bringing the measuring device along the central axis of the pipe line. In the center maintaining mechanism 50, circumferential receiving portions 51, 51 are fixed along the circumferential direction of the main body 1, and center setting jigs 52, 52 are fixed to the circumferential receiving portions. The center setting jigs 52 and 52 function so as to position the main body 1 at the center of the existing pipe line, and are fixed at a symmetrical position at a middle position in the longitudinal direction of the main body 1.

  As shown in FIGS. 8 and 9, the center setting jig 52 includes a guide shaft 57 in which a pipe portion 54 protrudes from a base portion 53 and is biased outward by a differential pressure of springs 55 and 56 in the pipe portion. It touches the inner surface. The spring 55 is configured such that the pressing force is adjusted by an adjusting body 58 that is moved by an adjusting bolt, and the elastic contact force of the guide shaft 57 to the pipe wall surface can be adjusted. Therefore, the left and right guide shafts 57, 57 of the center setting jigs 52, 52 are elastically brought into contact with the side surface of the inner wall of the pipe line so that the main body 1 is positioned at the center of the pipe line. The center setting jig 52 is fixed to the circumference receiving portion 51 so as to be movable, and is fixed so as to be horizontal when the diameter is small, for example, in accordance with the diameter of the pipe. By moving the base portion 53 along the circumferential receiving portion 51, the center setting jig 52 can be brought into elastic contact with the inner wall surface at a preferable angle even in pipes having different diameters.

  The operation of the existing pipe line state measuring method using the measuring apparatus D of the present embodiment configured as described above will be described below with reference to FIGS.

  In this embodiment, the pipe P is a reinforced concrete fume pipe having an inner diameter of about 600 mm, and the pipe P is a junction pipe through which dirty water and rainwater flow. The pipe P has been aged for a long time after being buried in the ground, and a predetermined gradient is obtained by unequal subsidence, etc., with respect to the gradient K at the time of embedding indicated by a two-dot chain line in FIG. If there is a part that is not present and storm water flows and the flow rate is high, sewage also flows simultaneously. However, when it is only sewage, it is difficult to flow and stays, and a new waterway is required for repair. The measuring device D is a device that quickly and accurately measures such a state of the pipe line. The pipe P is not limited to a pipe having an annular cross section, and may be a horseshoe or rectangular pipe.

  It is preferable to measure the state of the pipe line, for example, between every two adjacent manholes 60 and 60. When adjacent manholes are extremely close and linearly continuous, the measurement may be performed by passing one or two manholes located in the middle. Basically, the measurement is performed in a straight section where the reference beam of the laser emitting device used at the time of measurement can be seen through. The measuring device D is carried into the pipeline from one manhole 60 in the section of the pipeline where the state is to be measured.

  Next, a laser emitting device 61 for projecting laser light is installed on the downstream side of the pipeline P, the reference beam Bm is projected toward the upstream side of the pipeline P, and from the upstream side of the pipeline P toward the downstream side. The measurement device D is moved and measured. The arrangement of the laser emitting device 61 and the measuring device D is reversed on the upstream side and the downstream side, the laser emitting device is installed on the upstream side of the pipe P, and the reference beam is projected toward the downstream side. It is also possible to move the measuring device D from the downstream side to the upstream side to measure the state of the pipe P rising, sinking, or meandering.

  When an operator enters the pipe line from the manhole 60 of the pipe line P and forms the weir 62 and stops the sewage water flowing down, the water level gradually rises. For example, the height of the weir is set so that the water level rises to about the center of the height of the pipeline. Further, when the sewage flows down, it overflows from the upper end of the weir and flows downstream, so that the water level is kept constant. In addition, as shown in the drawing, two weirs 62 and 63 may be formed, and a pump 64 may be installed on the upstream weir 63 to obtain a liquid having a predetermined height. Thus, after the fixed sewage 65 is stored by building a weir, the measurement apparatus D is floated on the sewage from the upstream side, and the state of the pipe line P is measured. In this measurement, a measurement point is set by dividing the distance between two manholes at a predetermined distance interval, and the position of the upper part of the inner wall of the pipe line is measured based on a horizontal reference beam Bm for each measurement point.

  The laser emitting device 61 is operated to emit a horizontal reference beam Bm. The reference beam is not limited to being horizontal, and may be emitted with a slight gradient, for example. In the present embodiment, the reference beam Bm that slightly rises from the downstream side is emitted in accordance with the gradient K of the pipeline. The measuring device D is floated on the upstream side, and the contact body 30 is raised and elastically contacted with the upper inner wall surface of the pipe line. The measuring device D is positioned on the center line in the vertical direction passing through the center of the pipe line by the center maintaining mechanisms 50, 50, and the contact body 30 is elastically contacted with the uppermost point of the pipe line. In this state, the reference beam Bm hits the scale 31 of the contact body 30, and the distance between the upper wall surface of the pipe at the measurement point and the projection position (measurement position) of the reference beam with respect to the reference beam is apparent on the scale. It becomes. By reading this state with the camera device 45 attached to the measurement device and displaying it on a ground monitor, for example, the operator can confirm the height of the pipeline at the measurement point.

  The measurement device D is floated on the liquid, moved to the measurement point, the contact body 30 is brought into elastic contact with the upper wall surface, and an operation of imaging the scale 31 portion with the camera device 45 is performed at a plurality of locations. For example, at the upstream measurement point T1, the pipe P is slightly raised with respect to the initial gradient K, so that the projection position of the reference beam Bm on the monitor 66 is that of the scale 31 as shown in FIG. Lower position. The operator can measure from the projection position of the reference beam Bm that the distance (height) between the reference beam and the upper wall surface of the pipeline is d1. That is, the height of the pipeline at the time of measurement is measured by comparing the position at the time of burying the pipeline with the position at the time of measurement. Note that, at the measurement point T1, the lower wall surface of the pipe is raised due to the bulge, so the main body 1 of the measuring device D is not in a horizontal state as shown in FIG. Since the contact body 30 is in a vertical state by the vertical maintenance mechanism and can measure the height along the vertical direction, the measurement accuracy can be improved.

  In this way, by measuring the distance between the projection position (measurement position) of the reference beam Bm and the upper inner wall surface of the pipe P, the measurement point can be obtained without being affected by foreign matter accumulated below the pipe. It is possible to accurately measure the height of the pipe line P. Note that the main body 1 of the measuring device D can accurately measure the distance between the reference beam Bm and the upper wall surface of the pipe P, whether it is floated in a liquid or the sliders 3 and 3 are in contact with the bottom surface. it can. Moreover, since the main-body part 1 of the measuring apparatus D is located in the center of a pipe line by the center maintenance mechanisms 50 and 50, exact measurement is attained.

  Thereafter, the measurement apparatus is moved to an intermediate measurement point T2 and measured in the same manner. At the measurement point T2, since the pipe line has no change with respect to the initial gradient, the reference beam Bm is projected to the intermediate position of the scale 31, as shown in FIG. Thereby, it can be measured that the distance between the projection position of the reference beam and the upper wall surface of the pipe is d2 smaller than d1 at the measurement point T2. Further, at the measurement point T3 on the downstream side, the reference beam Bm is projected above the scale 31 as shown in FIG. Thereby, at the measurement point T3, it can be measured that the distance between the projection position of the reference beam and the upper wall surface of the pipe is d3 smaller than d2. In addition, the thing of appropriate forms, such as what is projected in a spot form and what is projected in a line form, can be used for a reference beam.

  In this way, the contact body 30 of the measuring device D is brought into contact with the upper wall surface of the pipe at a plurality of measurement points, the height of the pipe is measured, and the measuring device D is moved, for example, 1 m downstream to perform the same measurement. I do. Thus, for example, the distance between the reference beam Bm and the upper inner wall surface of the pipe is measured every 1 m, and the height of the inner wall surface of the upper pipe is measured continuously every 1 m. By this measurement, it is possible to accurately grasp the gradient of the pipeline to be measured and the undulation state. Further, by seeing the horizontal movement of the projection position of the reference beam Bm projected on the scale 31, the meandering state of the pipeline can also be measured. In this case, it is preferable to attach a target having a large area to the contact body, since the horizontal fluctuation is known.

  For example, the measuring device D can be moved by inserting a rope (not shown) from two manholes, connecting one rope to one end of the main body, and connecting the other rope to the other end of the main body. The measuring device can be moved from the upstream side to the downstream side by loosening the rope connected to the upstream side and pulling the rope connected to the downstream side. In addition, a rope inserted from an upstream manhole can be connected in a state where the measuring device is floated in a liquid, and the rope can be loosened and moved on a flow of sewage flowing down. Thus, any method may be used for the movement of the measuring apparatus in the pipeline.

  Another embodiment of the present invention will be described in detail with reference to FIG. FIG. 12 is a cross-sectional view of a principal part showing another embodiment of the existing pipe line state measuring apparatus according to the present invention. In addition, this embodiment is characterized in that the measuring device is provided with a lifting device for a contact body that comes into contact with the upper inner wall surface of the pipe line. Other substantially equivalent configurations are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 12, the contact body 70 has a function of contacting the upper inner wall surface of the pipe P and measuring the position of the pipe relative to the reference beam emitted from the laser emitting device. The contact body 70 has an inner peripheral shaft 72 positioned inside the outer peripheral pipe portion 71, and the inner peripheral shaft is urged upward by a compression spring 73, and the lifting device 75 opposes the urging force of the compression spring. The inner peripheral shaft 72 is lowered. That is, a winding pulley 77 is fixed to the motor 76 of the lifting device, and the end portion of the wire 78 wound around the winding pulley is connected to the lower end of the inner peripheral shaft 72. By operating the motor 76, the wire 78 is wound up and the inner peripheral shaft 72 is lowered. In the contact body 70 of FIG. 12, the contact piece 74 that elastically contacts the upper wall surface of the pipe has a boat bottom shape and can contact the upper wall surface of the pipe over a wide area, so that wear during measurement is caused. Can be reduced.

  In this embodiment, the contact body 70 is lowered by the elevating device 75 when the measuring device D is moved to the measurement point. As a result, the contact resistance between the contact body 70 and the wall surface can be reduced during the movement of the measuring device in the pipeline, and the movement is facilitated. Although not shown, it is preferable that the left and right guide shafts 57, 57 of the center maintaining mechanism 50 are also moved inward to be retracted from the pipe wall surface and moved in a state where the guide shafts are separated. Each time the measuring device is moved, the contact body is lowered and the same measurement is performed. Thus, for example, the distance between the reference beam and the upper inner wall surface of the pipe is measured every 1 m, and the height of the inner wall surface of the upper pipe is measured continuously every 1 m. By this measurement, it is possible to accurately grasp the gradient of the pipeline to be measured and the undulation state.

  Next, another embodiment of the state measurement method for an existing pipeline according to the present invention will be described with reference to FIG. In this embodiment, the state measurement of the pipe line between the manhole 80 on the upstream side of the pipe line P and the manhole 81 on the downstream side is performed. First, a weir 82 is formed on the bottom face of the downstream pipe line to stop sewage in service. Then, the workers M1 and M2 enter the manholes 80 and 81, and the measuring device D is floated on the sewage 83 that is blocked. The worker M1 connects the rope R1 to one end of the measuring device D and causes the measuring device D to flow down from the upstream side. When the measuring device D reaches the manhole 81 on the downstream side, the worker M2 connects the rope R2 to the other end of the measuring device D and connects the tip of the measuring scale portion 85 of the measure 84. The measure 84 is preferably a steel tape measure of about 50 m, for example.

  Thereafter, when the upstream worker M1 pulls the rope R1 and draws the measuring device D, the measure 84 gradually extends to confirm the position of the measuring device in the pipeline. For example, when measuring the state of the pipe line at intervals of 1 m, the measurement is performed at a location where the extension amount of the measure 84 is 1 m. Similarly to the above-described embodiment, this measurement is performed by reading the projection position of a reference beam (not shown) with the scale 31 of the contact body 30 and measuring the distance from the upper wall surface of the pipe. In this embodiment, the workers M1 and M2 can easily move the measuring device D from the manholes on both sides using the ropes R1 and R2, and the measurement location can be easily confirmed using the measure 84. Pipeline state measurement work can be performed efficiently in a short time. The measure was used as a means for confirming the position of the measuring device D in the pipeline, but other measuring devices such as a laser distance meter can be used. By using this type of measuring device, Can be measured efficiently.

  Still another embodiment of the existing pipe line state measuring method according to the present invention will be described with reference to FIG. This embodiment is characterized in that the scale on which the reference beam is projected is wide in the horizontal direction, and the meandering state of the pipeline can be easily measured. The scale 90 has a substantially elliptical shape, and numerals “20” to “70” are attached in the vertical direction, and numerals “10” to “50” are attached in the horizontal direction. The numbers in the vertical direction indicate the distance from the upper end of the contact piece 41 fixed to the tip of the telescopic shaft of the contact body 30 that is in elastic contact with the upper inner wall surface of the pipe. The horizontal numbers indicate the distance from the center of the contact body 30 in the left-right direction. The horizontal numbers may be deleted. Further, instead of the numbers, the squares may be formed at a pitch of 1 mm, and appropriate changes such as color coding of the squares can be made.

  When the scale 90 configured as described above is used, the distance between the upper inner wall surface of the pipe and the reference beam Bm can be measured as in the above embodiment, and the horizontal direction of the pipe at the measurement point can be measured. The deviation, that is, the amount of meandering can be measured. In the illustrated example, based on the spot S (measurement position) which is the projection position of the beam Bm, the distance between the upper inner wall surface and the reference beam is about “51” mm at this measurement point, and the center of the pipe line The axis is shifted by about “5” mm to the left. The state of the pipe line measured in this way is imaged by the camera device 45 provided in the measuring device and displayed on, for example, a monitor 66 installed on the ground. The scale 90 can be easily replaced with the contact body 30, and it is preferable that the left and right widths can be changed in accordance with the meandering width.

  In the above-described embodiment, the center maintaining mechanism 50 fixed to the main body 1 of the measuring device D has been shown as an example in which one pair is fixed to the left and right of the approximate center before and after the main body 1, but the measurement shown in FIG. Two pairs of central maintenance mechanisms 50 may be fixed at left and right symmetrical positions of the main body 1 as in the apparatus D1, and central maintenance is performed on one side of the main body 1 as in the measurement apparatus D2 shown in FIG. Two mechanisms 50 may be fixed, and one central maintaining mechanism 50 may be fixed on the opposite side. If comprised in this way, since the main-body part 1 can prevent the turning of the horizontal surface direction in a pipe line, and can maintain the stable state, it can measure the state of a pipe line more correctly.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed. For example, the main body of the measuring device has a ship shape that floats in a liquid such as sewage, but it is needless to say that it may be a lightweight floating body made of foam material or a floating shape such as a tank shape.

  The camera device that reads the scale is installed on the center line of the main body and reads the scale from the front. However, the camera device may be installed shifted from the center line so as to avoid the emitted reference laser beam. In this case, the camera device reads the scale from an oblique direction and confirms the position of the reference laser beam.

  Although the measurement device showed an example of measuring the state by floating in a liquid such as sewage in service, injecting clean water with the sewage blocked, not sewage in service, and using the measurement device in this clean water It is also possible to measure the state of pipelines such as subsidence and uplift. In this case, it is preferable that the sewage liquid such as sewage is discharged downstream using a bypass pipe or the like. In the above-described embodiment, a slider is fixed to the main body of the measuring device, and since this slider is configured with a narrow contact width in the circumferential direction, the water level is low and the main body is not in a completely floating state, Even when there is a foreign object on the bottom of the pipe, the measuring device can be moved smoothly. Further, instead of the slider, a plurality of wheels may be fixed so as to smoothly move in the pipeline.

  As an example of reading the position where the reference beam is projected on the scale, an example of reading on the monitor using a camera device was shown. However, using a light receiving element on the contact body that contacts the upper wall surface of the pipe, You may comprise so that a beam position may be confirmed. Further, a linear CCD may be used as the light receiving element, and the projection position of the reference beam may be directly read.

  The pressing force for urging the contact body elastically contacting the upper wall surface of the pipe line has been exemplified by the differential pressure of the two springs. However, the contact body may be configured to contact the wall surface by one spring force. . In addition, although the pressing force for urging the guide shaft of the central maintenance mechanism that positions the main body portion at the center of the pipe line is shown by the differential pressure of the two springs, this pressing force may also be by one spring force. .

  As an application example of the present invention, the present invention can also be applied to the use of a gradient measurement such as a culvert using the measurement apparatus. In addition, the measuring device can measure by floating on a liquid, and can measure by moving the slider in sliding contact with the bottom surface of the pipeline even when there is no liquid.

The front view which shows one Embodiment of the measuring apparatus used with the state measuring method of the existing pipeline which concerns on this invention. The top view of FIG. The left view of the state which installed the measuring apparatus of FIG. 1 in the pipe line. FIG. 2 is a cross-sectional view of a main part along the pipe line direction of the measuring apparatus of FIG. The top view which shows the principal part of FIG. FIG. 5 is a cross-sectional view of a main part taken along line AA in FIG. 4. FIG. 5 is a cross-sectional view of a main part taken along line BB in FIG. 4. Sectional drawing which shows the C section of FIG. 6 in detail. Sectional drawing which follows the DD line | wire of FIG. Sectional drawing of the longitudinal direction of the existing pipe line which implements a state measurement. A pipe line sectional view showing operation of state measurement. The principal part sectional drawing which shows other embodiment of the contact body of the measuring apparatus which concerns on this invention. Sectional drawing of the longitudinal direction of the existing pipe line which shows other embodiment of the state measuring method of the existing pipe line. The principal part perspective view which shows the other example of a scale. (A), (b) is a principal part top view which shows the other example of a measuring device, respectively.

Explanation of symbols

1: body part, 5: support plate, 10: substrate (first support plate), 13: support shaft (first shaft), 15: balance weight, 20: scale mounting plate (second support plate), 22: support shaft (second axis), 23: balance weight, 30: contact body, 31, 90: scale, 45: camera device (imaging device), 61: laser emitting device, 50: central maintenance mechanism, 60: Manhole, 65: Sewage (liquid), 66: Monitor, 75: Lifting device, 76: Motor, 77: Winding pulley, 78: Wire, D, D1, D2: Measuring device, P: Pipe line, Bm: Reference beam , D1 to d3: distance (height)

Claims (5)

A device for measuring the state of existing pipelines such as sewage pipes buried in the ground,
A main body, a contact body extending in a vertical direction from the main body section and elastically contacting the upper inner wall surface of the conduit, and a scale fixed to the contact body,
The said contact body is being fixed to the said main-body part via the vertical maintenance mechanism, The state measuring apparatus of the existing pipe line characterized by the above-mentioned. 2. The state measuring apparatus for an existing pipe line according to claim 1 , wherein the main body part includes a central maintaining mechanism for moving the main body part along the central axis of the pipe line. A method of measuring the state of the existing pipeline sewer or the like which is buried in the ground by using the measuring apparatus of the existing pipe line according to claim 1 or 2,
The distance between a predetermined measurement position and the upper inner wall surface of the pipe is measured, and the state of the pipe is measured by performing the measurement at a plurality of locations along the pipe. A method for measuring the state of existing pipelines. A method for measuring the state of an existing pipeline such as a sewer pipe buried in the ground using the existing pipeline state measuring device according to claim 2 ,
Moving the state measuring device;
Firing a reference beam along the horizontal direction or a predetermined gradient inside the pipeline,
The distance from the center of the contact body of the projection position of the reference beam projected on the contact body elastically contacting the upper inner wall surface of the pipe line to the left and right is measured, and the measurement is performed at a plurality of locations along the pipe line. A method for measuring the state of an existing pipeline, characterized in that the state of meandering in the horizontal direction of the pipeline is measured. The measuring device is, in a state in which the liquid sewage, etc. in service are under a stream existing pipe according to claim 3 or 4, characterized in that intended to be moved smiling the body portion to the liquid Road condition measurement method.

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