• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    This device for auscultation of a buried workable visit comprises a first measuring device (22). The auscultation device comprises a striking device (20) adapted to strike the surface of the buried structure; a second measuring device (24) adapted to measure the speed of the displacement of the surface of the buried work caused by the striking of the striking device; the first measuring device (22) is adapted to measure the speed of the displacement of the surface of the buried structure caused by the striking of the striking device; and the auscultation device comprises an acquisition device (26) adapted to record the speeds of displacements measured by the first and second measuring devices (22,24).
    公开号:BE1020271A3
    申请号:E201200332
    申请日:2012-05-22
    公开日:2013-07-02
    发明作者:
    申请人:Eau De Paris；
    IPC主号:
    专利说明:

    Auscultation device, together and method
    The present invention relates to a device for auscultation of a buried work including visitable including a first measuring device.
    Mechanical auscultation devices are known for examining a buried work that can be visited.
    Usually, these devices comprise a jack adapted to apply a thrust force on a surface of the buried structure and a device for measuring the displacement of the surface of the buried structure. Also, these devices are often heavy and bulky and are not suitable for auscultation of low linear structures (less than ten meters) such as manholes, or small cross section, or whose walls are congested by networks.
    The object of the present invention is to propose a portable auscultation device which is adapted for use in low linear works and which is easy to use.
    For this purpose the invention relates to a monitoring device of the type indicated above, characterized in that the auscultation device further comprises: a striking device adapted to strike a surface of the buried work; a second measuring device adapted to measure the speed of displacement of the surface of the buried structure caused by the striking of the striking device; in that the first measuring device is adapted to measure the speed of the displacement of the surface of the buried structure caused by the striking of the striking device; and the auscultation device comprises an acquisition device adapted to record the speeds of displacements measured by the first and second measuring devices.
    According to particular embodiments, the auscultation device according to the invention may comprise one or more of the following features: the striking device comprises an instrumented hammer including a force sensor and a tip made of material the acquisition device is adapted to detect the force applied by the striking device on the surface of the buried structure; one of the first or second measuring devices, and preferably each of the first and second measurement devices, comprises a measurement head provided with a geophone; the or each geophone is a geophone adapted to measure the speed of a horizontal movement; - The or each measuring head comprises a tip connected to a spring adapted to urge the tip against the surface of the buried work, and the geophone is attached to a base of the tip; the or each measuring device comprises a rod, and in that each rod is adapted to be applied to a wall of the buried structure.
    The subject of the invention is also an assembly of a buried structure and a monitoring device, the buried structure defining a longitudinal axis (XX), characterized in that the auscultation device is a device as described above, and in that the distance e2 between the measuring locations (EMI, EM2) of the first and second measuring devices on the surface of the buried structure is at least 0.5 m and is preferably smaller than at 1,5m.
    The invention also relates to a method of auscultation of a buried work by means of a monitoring device as described above, comprising the following steps: a) striking with the striking device on the surface of the work at a typing location (EF); b) measuring the speed of displacement of the buried structure surface caused by the striking with the first and second measuring devices respectively at first (EM1) and second (EM2) measuring locations.
    According to particular embodiments of the method, the method may comprise one or more of the following features: c) determining the force (F. (t)) of striking on the surface of the structure by a force sensor connected to the striking device.
    the striking location (EF) is located at a distance ex from the first measurement location which is smaller than the distance e2 between the first and the second measurement location, and the first measurement location (EM1) is located between the striking location and the second measurement location (EM2); before step a), at least one adaptation tap is made and preferably at least three taps are made; at least one of the following additional steps: d) calculate the dynamic stiffness KD of the structure "Max [F (t) buried: Kn = -fL v"
    Max dx (ƒ)] where F (t) is the force applied by striking the striking device and di (t) is the displacement of the work surface at the first measurement location and / or e) calculating a transmission rate of the deformation T Max [d2 (t)] D Max dx (f)] The invention will be better understood on reading the description which follows, given solely by way of example and made with reference to to the accompanying drawings, in which: - Figure 1 shows a set of a buried structure and a monitoring device according to the invention, in axial view; - Figure 2 shows schematically the arrangement of two measuring devices and a striking device of the auscultation device in the buried work; and - Figure 3 shows the assembly of Figure 1 according to a plan view.
    FIG. 1 shows in cross section an assembly of a buried structure 4 and a monitoring device 6. The buried structure 4 has opposite walls 8, 10 and each of the walls 8, 10 defines an interior surface 12, 14 of the book. The buried structure 4 is a pipe for example made of concrete and is used for the transport of wastewater and rainwater. In general, the buried work 4 is visitable and can be rainwater collection or wastewater collection, aqueduct, dry gallery.
    The buried structure 4 defines a longitudinal axis X-X extending for example substantially horizontally.
    The auscultation device 6 is provided with a striking device 20, a first measuring device 22 and a second measuring device 24. The monitoring device 6 also comprises an acquisition device 26, for example a computer.
    The auscultation device 6 defines a test plan PE.
    This test plane PE is preferably located in the longitudinal axis X-X of the buried structure and / or is horizontal. Preferably, the test plane PE is located halfway up the internal height of the buried structure 4.
    The striking device 20 is adapted to strike the surface of the buried structure 4. The striking device 20 strikes the surface 12 at an impact location EF.
    In this case, the striking device 20 is a hammer 28, which may be an instrumented hammer. The striking device 20 also comprises a force sensor 30 disposed on the hammer 28 and adapted to deliver a signal representing the force applied by the hammer 28. The force sensor 30 is connected by a signal line 32 to the acquisition device 26. The signal line 32 is adapted to transmit to the acquisition device 26 the signal representing the force applied by the hammer 28. Thus, the acquisition device 26 is adapted to detect the force F (t) applied by the striking device 20 on the surface of the buried work.
    In addition, the striking device 20 is provided with a plastic tip 34 disposed between the hammer 28 and the surface of the buried work 4 on which the tip 34 is struck with the hammer. This tip 34 makes it possible to adjust the duration of impact applied by the hammer 28 on the surface of the buried structure. The shock duration is for example between 4 ms and 6 ms. The hammer 28 can exert efforts of 0 to 10 kN.
    The first measuring device 22 defines a central axis AA and comprises a first measuring head 40 and a first rod 42. The first measuring head 40 is fixed to one end of the first rod 42. The other end of the first rod 42 is applied to the surface 14 of the wall 10.
    The first measuring head 40 is provided with a geophone 44 which is adapted to measure the speed of displacement of the surface 12 of the wall 8.
    The first measuring head 40 further comprises a tip 48 and a spring 50 adapted to urge the tip 48 against the surface 12 of the buried work. The geophone 44 is attached to a base of the tip 48. The first measuring head 40, more precisely the tip 48, is applied against the surface 12 of the buried work 4 at a first measurement location EM1.
    The geophone 44 is a geophone adapted to measure the speed of a horizontal displacement and has a measuring axis which coincides with the central axis AA of the first measuring device 22. The geophone 44 preferably has a resonant frequency of less than 5 Hertz. The geophone 44 is connected by a signal line 52 to the acquisition device 26. Thus, the geophone 44 is adapted to deliver a signal representing the speed of movement of the wall 12 to the acquisition device 26, and this to the measuring location EM1.
    The second measuring device 24 defines a central axis BB and comprises a second measuring head 60 and a second rod 62. The second measuring head 60 is attached to one end of the second rod 62. The other end of the second rod 62 is applied to the surface 14 of the wall 10.
    The second measuring head 60 is provided with a geophone 64 which is adapted to measure the speed of displacement of the surface 12 of the wall 8.
    The second measuring head 60 further comprises a tip 68 and a spring 70 adapted to urge the tip 68 against the surface 12 of the buried work. The geophone 64 is attached to a base of the tip 68. The second measuring head 60, more precisely the tip 68, is applied against the surface 12 of the buried work 4 at a second measurement location EM2.
    The geophone 64 is a geophone adapted to measure the speed of a horizontal displacement and has a measurement axis which coincides with the central axis BB of the second measuring device 62. The geophone 64 preferably has a resonant frequency of less than 5. Hertz. The geophone 64 is connected by a signal line 72 to the acquisition device 26. Thus, the geophone 64 is adapted to deliver a signal representing the speed of the displacement of the wall 12 to the acquisition device 26, and this to the measuring location EM2.
    The distance e2 between the measuring locations EMI, EM2 is at least 0.5 m. This distance e2 is preferably less than 1.5 m. In the example shown, the distance e2 is 1.0 m. The measuring locations EMI, EM2 are offset from each other in an axial direction of the structure, parallel to the axis X-X.
    The striking location EF is located at a distance βχ from the measuring location EM1 of the first measuring device. In the example shown, the distance ex is 0.1 m. The EF strike location is located in the PE test plane (see Figure 2).
    The measuring location EM1 is located between the striking location EF and the measuring location EM2. Each EMI, EM2 measurement location is located in the PE measurement plane.
    The two measuring devices 22, 24 are placed in such a way that the rods 42, 62 and the geophones 44, 64 are arranged horizontally. Thus, the central axis A-A, B-B of each measuring device 22, 24 is located in the test plane PE. The central axes A-A, B-B are arranged parallel to each other.
    The acquisition device 26 is adapted to record the measured displacements of the first 22 and second 24 measuring devices. In the present case, the displacement dx (t) of the surface 12 at the first measurement location EM1 is calculated by integrating the speed vx (t) measured by the geophone 44; dx (t) = a, ƒ (t) dt; where ax is a calibration coefficient. Similarly, the displacement d2 (t) of the surface 12 at the second measurement location EM2 is calculated by integrating the speed v2 (t) measured by the geophone 64; d2 (t) = a2; where a2 is a calibration coefficient. Each of the calculations is performed by the acquisition device 26.
    The acquisition device 26 is adapted to calculate the dynamic stiffness KD of the buried structure according to the formula
    where F (t) is the force applied by the strike of the striking device and di (t) is the displacement of the work surface at the first measurement location EM1, caused by this strike of the striking device.
    The acquisition device 26 is also adapted to calculate a transmission rate of the deformation TD according to the formula
    where di (t) is the displacement of the work surface at the first measurement location EM1 and d2 (t) is the displacement of the work surface at the second measurement location EM2.
    When the two measuring devices 22, 24 are out of contact with the walls of the buried structure 4, they are not fixed to a support which defines the distance between these measuring devices. Thus, the measuring devices are movable independently of one another. Also, the striking device 20 is not attached to a support which defines the distance between the striking device 20 and the measuring devices 22, 24. As a result, the monitoring device can be used in the low-pressure conduits. inner size or short length.
    The method of auscultation of the buried structure 4 comprises the following steps: a) striking with the striking device (20) on the surface of the structure at a striking site (EF); b) measuring the speed of displacement of the surface (12) of the buried structure caused by the striking with the first and second measuring devices respectively at first EM1 and second EM2 measuring locations; c) determining the force (F (t)) of the striking on the surface of the structure by the force sensor connected to the striking device; d) calculate the dynamic stiffness KD of the buried structure:
    where F (t) is the force applied by striking the striking device and dx (t) is the displacement of the surface of the structure at the first measurement location and / or e) calculating a transmission rate of the deformation
    where di (t) is the displacement of the work surface at the first measurement location and d2 (t) is the displacement of the work surface at the second measurement location.
    Before step a), it is possible to perform at least one matching tap and preferably at least three taps. For this purpose, for each test a series of several successive impacts are performed at the strike site EF to overcome the plastic adaptation effects that appear on the first impacts. At each adaptation stroke, the data from the measuring devices 22, 24 and / or the force sensor are not used.
    In general, the striking location EF is located at a distance ei from the first measurement location which is smaller than the distance e2 between the first and the second measurement location and the first measurement location is located between the first and second measurement locations. EF strike location and the second EM2 measurement location.
    Then, the auscultation device is moved by a step which is between 1 to 10 m depending on the size of the area to be diagnosed. In addition, the tests of auscultation are carried out successively on the two walls 8, 10 of the buried work 4.
    Alternatively, each geophone can be replaced by another speed measuring device.
    权利要求:
    Claims (13)
    [1]
    1. Device for auscultation of a buried structure, particularly visitable, of the type comprising a first measuring device (22), characterized in that the auscultation device further comprises: - a striking device (20) adapted to hit a surface of the buried work; - a second measuring device (24) adapted to measure the speed of the displacement of the surface of the buried work caused by the striking of the striking device; in that - the first measuring device (22) is adapted to measure the speed of displacement of the surface of the buried structure caused by the striking of the striking device, - and in that the monitoring device comprises a acquisition device (26) adapted to record the speeds of displacements measured by the first and second measuring devices (22, 24).
    [2]
    2. Auscultation device according to claim 1, characterized in that the striking device (20) comprises an instrumented hammer (28) in particular provided with a force sensor (30) and a plastic tip (34). ).
    [3]
    3. Auscultation device (26) according to claim 1 or 2, characterized in that the acquisition device is adapted to record the force applied by the striking device on the surface of the buried work.
    [4]
    4. Auscultation device according to any one of the preceding claims, characterized in that at least one of the first or second measuring devices, and preferably each of the first and second measuring devices comprises a measuring head (40, 60) provided with a geophone (44, 64).
    [5]
    5. A monitoring device according to claim 4, characterized in that the or each geophone (44, 64) is a geophone adapted to measure the speed of a horizontal movement.
    [6]
    6. Auscultation device according to claim 4 or 5, characterized in that the or each measuring head (40, 60) comprises a tip (48, 68) connected to a spring (50, 70) adapted to solicit the tip against the surface of the buried work, and in that the geophone (44, 64) is attached to a base of the tip.
    [7]
    7. Auscultation device according to any one of claims 4 to 6, characterized in that the or each measuring device comprises a rod (42,62), and in that each rod is adapted to be applied on a wall of the buried work.
    [8]
    8. Set of a buried work and a monitoring device, the buried work defining a longitudinal axis (XX), characterized in that the auscultation device (6) is a device according to one of the claims previous, and in that the distance e2 between the measuring locations (EMI, EM2) of the first (22) and second (24) measuring devices on the surface (12) of the buried structure is at least 0, 5 m and is preferably less than 1.5 m.
    [9]
    9. A method of auscultation of a buried work by means of an auscultation device according to any one of claims 1 to 7, comprising the following steps: a) striking with the striking device (20) on the surface the work at a typing location (EF); b) measuring the speed of the displacement of the surface (12) of the buried structure caused by the striking with the first and second measuring devices respectively at first (EM1) and second (EM2) measuring locations.
    [10]
    10. The method of claim 9 characterized in that it further comprises the following step: c) determine the force (F (t)) of the striking on the surface of the structure, by a force sensor connected to the striking device.
    [11]
    Method according to one of claims 9 or 10, characterized in that the striking location (EF) is located at a distance ex from the first measurement location which is smaller than the distance e2 between the first and the second location. second measurement location, and in that the first measurement location (EM1) is located between the striking location and the second measuring location (EM2).
    [12]
    12. Method according to any one of claims 9 to 11, characterized in that, before step a), at least one adaptation tap is made and preferably at least three adaptation taps.
    [13]
    13. Method according to any one of claims 9 to 12, characterized in that it comprises at least one of the following additional steps: d) calculate the dynamic stiffness 1¾ of the buried structure:

    where F (t) is the force applied by the strike of the striking device and di (t) is the displacement of the surface of the structure at the first measurement location and / or e) calculating a transmission rate of the deformation

    where diit) is the displacement of the work surface at the first measurement location and d2 (t) is the displacement of the work surface at the second measurement location.
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    同族专利:
    公开号 | 公开日
    FR2975785B1|2014-03-21|
    FR2975785A1|2012-11-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    SE339334B|1970-02-05|1971-10-04|Atlas Copco Ab|
    US4318302A|1978-12-13|1982-03-09|Conoco Inc.|Method of determining mine roof stability|
    US4615209A|1985-01-03|1986-10-07|Change Jr Nicholas D|Multi range impulse hammer|
    US5983701A|1997-06-13|1999-11-16|The Royal Institution For The Advancement Of Learning|Non-destructive evaluation of geological material structures|
    FR2871570B1|2004-06-10|2006-09-29|Paris Eaux Gestion|DEVICE FOR MEASURING THE RIGIDITY OF A WALL AND CORRESPONDING METHOD|
    法律状态:
    2021-03-19| MM| Lapsed because of non-payment of the annual fee|Effective date: 20200531 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1154477A|FR2975785B1|2011-05-23|2011-05-23|AUSCULATING DEVICE, ASSEMBLY AND METHOD THEREOF|
    FR1154477|2011-05-23|
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