WO2006049303A1 - シース管のグラウト充填検査方法及びその装置 - Google Patents
シース管のグラウト充填検査方法及びその装置 Download PDFInfo
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- WO2006049303A1 WO2006049303A1 PCT/JP2005/020464 JP2005020464W WO2006049303A1 WO 2006049303 A1 WO2006049303 A1 WO 2006049303A1 JP 2005020464 W JP2005020464 W JP 2005020464W WO 2006049303 A1 WO2006049303 A1 WO 2006049303A1
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- sheath tube
- grout
- signal
- inspection
- sheath
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
Definitions
- the present invention relates to a method for detecting a grout filling of a long sheath pipe used in a PC (prestressed concrete) structure, and in particular, to accurately detect the position of a grout filling defective part of a sheath pipe.
- the present invention relates to an improved method and apparatus for grout filling inspection of a sheath tube.
- Conventional PC structures include a pre-tension method and a post-tension method depending on the time when tension is applied.
- the post-tension method is a mode in which the sheath tube is carried in the concrete.
- the sheath (hollow pipe) passing through the steel material as the main reinforcement material is loaded before the concrete.
- the ends are fixed by tightening the main reinforcement with a hydraulic jack or the like.
- the gap between the steel material as the main reinforcing material and the sheath is filled with grout such as mortar to protect the steel material from deterioration over time such as wrinkles and to transmit the tension of the steel material to the concrete.
- grout such as mortar
- the conventional method for inspecting the grout filling of the sheath tube is to measure the grout filling flow rate into the sheath tube at the time of construction, and stop the filling operation at the stage where the grout would have been filled into the sheath tube.
- This method is the mainstream, but this method does not directly measure individual parts in the sheath tube. Since the grout must be judged indirectly as a whole, it was extremely difficult to accurately grasp the filling state.
- a method of irradiating ultrasonic waves from the concrete outer wall facing the peripheral surface of the sheath tube and determining the grout filling state based on the state of the reflected wave For example, Patent Document 1 and a method of transmitting an elastic wave from a concrete outer wall surface facing the peripheral surface of a sheath tube and determining a grout filling state based on the reflected wave of the elastic wave (for example, Patent Document 2)
- a radiation irradiation method is also known in which a transmission image is projected onto an X-ray film or image plate by irradiating radiation, and the filling state of the grout in the sheath tube is discriminated.
- Patent Document 1 JP-A-8-248012 (Example, FIG. 1)
- Patent Document 2 Japanese Patent Laid-Open No. 10-54140 (Embodiment of the Invention, FIG. 1)
- both of them are inspected in a direction perpendicular to the axial direction of the sheath tube.
- the inspection must be performed at a number of inspection points along the direction, and in addition, it is necessary to contact the probe due to the characteristics of the ultrasonic wave and the elastic wave. Leads to.
- since the sheath tube is in a state of being carried in the structure there are many cases where direct access is difficult, and detection accuracy is still insufficient.
- the radiation irradiation method has problems such as protection against exposure, and a specialized qualification holder is required for handling, so it cannot be said that the method is easy to handle.
- the present invention has been made to solve the above technical problems, and pays attention to the structure of the sheath tube, and satisfies the demands of shortening the inspection time and facilitating the inspection work. It is another object of the present invention to provide a sheath tube grout filling inspection method and apparatus capable of reliably inspecting the state of grout filling in the sheath tube. Means for solving the problem
- a long main muscle material 3 is inserted into a sheath 2, and a sheath tube is formed by filling the sheath 2 with a grout 4.
- a detection signal incident process in which a broadband inspection signal A is incident from one axial end of the sheath tube (1), and a grout filling healthy portion and a poor filling portion in the sheath tube (1).
- a signal change extraction step for extracting the signal change B based on the characteristic impedance difference, and determining a filling state of the grout 4 in the sheath tube 1 based on the extracted signal change B.
- the present case is a method for checking the quality of the sheath tube 1 in the grout 4 filling state.
- This sheath tube 1 is used, for example, in a post-tension method, This is done after construction.
- the grout 4 filling state of the sheath tube 1 is poor, the poor filling portion of the grout 4 will be refilled at the time of enforcement, refilled, and after refilling. If you do repair and reinforcement work.
- a wideband signal having a wide frequency component is used in the frequency domain analysis, and a short pulse signal is used in the time domain analysis. (Impulse signal) should be used.
- the degree of broadband the bandwidth or pulse width that can be selected as long as the grout filling state in the sheath tube can be appropriately selected is the required detection performance (of the defective filling portion to be detected). Shortest length and positioning accuracy).
- the inspection signal A is propagated along the axial direction of the sheath tube 1 as long as the incident position of the inspection signal A is at one end in the axial direction of the sheath tube 1.
- the structure of the sheath tube 1 is the coaxial structure of the main reinforcement 3 and the sheath 2 and this corresponds to the coaxial cable structure, it can be considered that it corresponds to the coaxial transmission line of the distributed constant circuit, Analysis using transmission line theory becomes possible.
- the extraction method is as follows. This is especially questionable.
- the signal change B emitted from one axial end portion of the sheath tube 1 on the side on which the inspection signal A is incident is extracted.
- the extraction position of the signal change B and the incident position of the inspection signal A can be the same end of the sheath tube 1, and the acquisition of the signal change B can be performed at one place, so that the inspection apparatus can be integrated. It is preferable in terms of ease.
- the signal change extraction step the signal change B leaked from the peripheral surface of the sheath tube 1 may be extracted, or the signal change extraction step is located on the side opposite to the side on which the detection signal A is incident.
- the signal change B emitted from the other axial end of the sheath tube 1 may be extracted.
- the inspection process is simplified because the incident position of the inspection signal A can be fixed. It is preferable at the point which becomes possible.
- ultrasonic waves and elastic waves are transmitted from the respective inspection points M (l), M (2), M (3) ... M (n) on the peripheral surface of the sheath tube 1.
- the inspection time can be greatly shortened because at least the incident position of the inspection signal A can be fixed.
- a method of measuring a leaky wave using an antenna along the axial direction of the sheath tube 1 is employed. However, the antenna can be moved without contact.
- the method for determining the filling state of the grout 4 in the sheath tube 1 may be appropriately selected as long as it is based on the extracted signal change B. In this case, it is possible to identify the defective filling portion of the grout 4 according to the state (position, size) of the signal change B.
- the present invention is not limited to the method of grout filling inspection of a sheath tube, but also covers an apparatus embodying the method.
- a long main reinforcement 3 is inserted into the sheath 2, and the sheath 2 is filled with the grout 4 in the sheath 2.
- the inspection signal generating means 5 for generating the broadband inspection signal A, and the incident plan for guiding the inspection signal A generated by the inspection signal generating means 5 to one axial end of the sheath tube 1 Means 6 and grout in sheath tube 1
- Any signal change measuring means 7 for measuring the signal change B based on the difference between the signals and the emission guide means 8 for guiding the signal change B emitted from the sheath tube 1 to the signal change measuring means 7 may be used.
- the inspection signal generating means 5 pulse generator, broadband oscillator, etc.
- the incident guiding means 6 correspond to the realization elements of the inspection signal injection process, and the signal change extraction process is realized.
- the elements correspond to the signal change measuring means 7 (waveform analyzer having a time domain or frequency domain measuring function) and the extraction guide means 8.
- the incident guide means 6 and the emission guide means 8 are configured by a coupler disposed at one end of the sheath tube 1 in the axial direction. According to this aspect, it is possible to share the entrance guide means 6 and the exit guide means 8 by making the entrance position of the inspection signal A and the exit position of the signal change B the same.
- the incident guide means 6 is constituted by a coupler arranged at one end in the axial direction of the sheath tube 1, and the emission guide means 8 is arranged on the peripheral surface of the sheath tube 1.
- the aspect comprised by the antenna placed is mentioned. This mode is based on the characteristic impedance difference between the dirty part 4 in the sheath tube 1 and the poorly filled part, and electromagnetic waves are weakly leaked in the circumferential direction of the sheath pipe 1 as signal change B in the poorly filled part. This phenomenon is utilized.
- the incident guide means 6 is constituted by a coupler arranged at one end portion in the axial direction of the sheath tube 1, and the output guide means 8 is arranged in the axial direction of the sheath tube 1.
- positioned at an edge part is mentioned.
- the incident position of the inspection signal A and the emission position of the signal change B are distributed to both ends of the sheath tube 1.
- the grout filling inspection method for a sheath tube paying attention to the structure of the sheath tube, a broadband inspection signal is incident from one axial end of the sheath tube, and the grout filling healthy portion in the sheath tube The signal change based on the characteristic impedance difference with the poorly filled part is extracted, so that the quality of the grout filling state in the sheath tube is ensured while satisfying the demands of shortening the inspection time and facilitating the inspection work. Can be inspected. Further, according to the grout filling inspection apparatus for a sheath tube according to the present invention, the above-described method invention can be easily realized.
- Garden 1 (a) is an explanatory view showing an outline of a grout filling inspection method for a sheath tube according to the present invention, and (b) is an explanatory view showing an outline of a grout filling inspection apparatus for a sheath tube according to the present invention.
- 2 (a) is an explanatory view showing the operation of the sheath tube grout filling inspection method according to the present invention, and (b) is an explanatory view showing the operation of the sheath tube grout filling inspection method according to the comparative model. .
- (A) is an explanatory diagram showing an outline of the sheath tube structure used in the first embodiment
- (b) is an explanatory diagram showing an electrical equivalent circuit of the sheath tube
- (c) is a high frequency of the sheath tube. It is explanatory drawing which shows the electrical equivalent circuit in an area
- (a) is an explanatory diagram showing an electrical equivalent circuit when there is a poorly filled grout in a part of the sheath tube, and (b) shows a high-frequency inspection signal A at one axial end of the sheath tube. It is explanatory drawing which shows the output condition of the signal change radiate
- FIG. 8 is an explanatory diagram showing an outline of the sheath tube grout filling inspection apparatus according to the second embodiment.
- FIG. 9 An explanatory diagram showing an outline of the sheath tube grout filling inspection apparatus according to the third embodiment.
- FIG. 10 An explanatory diagram showing an outline of a grout filling inspection apparatus for a sheath tube according to a fourth embodiment.
- FIG. 3 (a) shows a structural example of the sheath tube applicable in the first embodiment.
- the figure shows a sheath tube 10 embedded in concrete 20 by the post-tension method.
- the structure of the sheath tube 10 is such that, for example, the sheath 11 made of a hollow pipe such as a steel tube is embedded in the sheath tube 10 through the main reinforcing material 12 made of steel, for example, and then the concrete 20 is cast.
- the main reinforcement 12 is tensioned with a hydraulic jack 15 or the like to fix the ends.
- the gap between the main reinforcement 12 and the sheath 11 is filled with a grout 13 such as mortar to protect the main reinforcement 12 from deterioration over time such as wrinkles, and to reduce the tension of the main reinforcement 12 to concrete 20 I have come to tell you.
- the structure of this type of sheath tube 10 can be considered by replacing it with the structure of a coaxial cable when viewed electrically.
- the coaxial cable 100 has a core wire in the outer shield 101 as shown in FIG. 102 is inserted, and the gap between the outer shield 101 and the core wire 102 is filled with an insulating material 103, and each component of the sheath tube 10 is replaced with each component of the coaxial cable 100 as follows. It corresponds.
- the sheath tube 10 can be regarded as an electrically distributed constant circuit like the coaxial cable 100. It is possible to apply the theory.
- the sheath tube 10 shown in FIG. 4 (a) is represented by an electrical equivalent circuit as shown in FIG. 4 (b).
- R, L, C, and G indicate resistance, inductance, capacitance, and conductance per unit length of the sheath tube 10, respectively.
- a signal having a high frequency component for example, is incident on one end of the sheath tube 10 in the axial direction as a broadband inspection signal A
- the sheath tube 10 is used in the high frequency region.
- the equivalent circuit of FIG. 4 (b) since the L component and the C component are dominant, the equivalent circuit of FIG. 4 (c).
- the capacitance of the poorly filled portion N in which the grout 13 is not sufficiently filled changes in capacitance. Therefore, assuming that the capacitance is C, the impedance at that portion is changed.
- the sheath tube 10 is widened from one end in the axial direction.
- the short pulse signal is reflected at the discontinuity point of the characteristic impedance as shown in FIG. Return.
- the reflected signal 0 indicates that the short pulse signal is directly reflected on the axial end of the sheath tube 10, and the reflected signal 1 is reflected on the incident side of the poorly filled portion N of the grout 13.
- the reflected signal 2 is reflected on the exit side of the poorly filled portion N of the grout 13.
- the amount of reflection of the reflected signals 1 and 2 depends on the impedance (Z, Z) of the transmission path in the sheath tube 10.
- the propagation speed V of the short pulse signal in the transmission path is expressed as follows.
- C is the capacitance per unit length
- ⁇ is the relative dielectric constant of the main reinforcement
- ⁇ is the grout
- a short pulse signal is incident as a broadband inspection signal A from one axial end of the sheath tube 10, and the reflection by the reflected signals 1 and 2 is performed. If the shot signal pattern (signal change) B is extracted, the position and size of the poorly filled portion N of the grout 13 can be specified based on the signal change B.
- FIG. 1 a sheath tube grout filling inspection apparatus used in the present embodiment is shown in FIG. 1
- the inspection device is a mode that enables analysis in the time domain, and measures a pulse generator 21 that generates a short pulse signal as a wideband inspection signal A and a reflected signal pattern B as a signal change.
- Waveform analyzer 22 and the short pulse signal generated by the pulse generator 21 are guided to one end in the axial direction of the sheath tube 10 and the signal change B emitted from one end in the axial direction of the sheath tube 10 is subjected to waveform analysis.
- a coupler 23 leading to the vessel 22 is a function of matching the impedance difference between the pulse generator 21, the waveform analyzer 22 and the sheath tube 10, and efficiently supplies or takes in the short pulse signal A or the signal change B. Is.
- the short pulse signal A is incident from the pulse generator 21 to one end portion in the axial direction of the sheath tube 10 via the coupler 23.
- repair work may be performed on the poorly filled portion N.
- FIG. 8 shows a second embodiment of the sheath tube grout filling inspection apparatus to which the present invention is applied.
- the inspection apparatus is an aspect that enables analysis in the time domain, as in the first embodiment.
- a pulse generator 21 that generates a short pulse signal as a broadband inspection signal A, and the short pulse signal generated by the pulse generator 21 are connected to one end of the sheath tube 10 in the axial direction.
- the short pulse signal A is incident from the pulse generator 21 to one end portion in the axial direction of the sheath tube 10 via the coupler 24.
- the characteristic impedance changes in the transmission path.
- the transmission degree of a part of the sheath tube 10 changes, and is measured by the waveform analyzer 22 via the coupler 25 at the other end in the axial direction of the sheath tube 10. And see the measured signal change B For example, the filling state of the grout 13 in the sheath tube 10 can be determined.
- FIG. 9 shows Embodiment 3 of a sheath tube grout filling inspection apparatus to which the present invention is applied.
- the inspection apparatus is an aspect that enables analysis in the frequency domain.
- a coupler 33 for guiding the signal change B emitted from one end of the sheath tube 10 in the axial direction to the waveform analyzer 32.
- the coupler 33 is provided with a matching function for the impedance difference to be coupled, as in the first embodiment.
- a broadband high-frequency signal is used in place of the short pulse signal of the first embodiment, and measurement substantially similar to that of the first embodiment is performed.
- FIG. 10 shows a fourth embodiment of a grout filling inspection apparatus for a sheath tube to which the present invention is applied.
- the inspection apparatus is a mode of extracting a signal change leaking from the non-uniform portion of the grout of the sheath tube 10 to the peripheral surface of the sheath tube 10, for example, a wideband oscillator 31 that generates a wideband inspection signal A and a broadband oscillator A coupler 33 that guides the broadband high-frequency signal as the broadband test signal A generated at 31 to one end of the sheath tube 10 in the axial direction, and is disposed on the outer surface of the sheath tube 10 along the axial direction of the sheath tube 10
- the antenna 35 receives the signal change B that moves in a non-contact manner and leaks from the peripheral surface of the sheath tube 10, and the receiver 36 that captures the signal received by the antenna 35.
- the broadband high-frequency signal as the broadband inspection signal A is incident on the axial end of the sheath tube 10 via the coupler 33 from the broadband oscillator 31.
- the antenna 35 is sequentially moved along the axial direction of the sheath tube 10 and the inspection is performed at each measurement point, the non-uniform portion of the grout 13 (specifically, specifically, the sheath tube 10).
- the characteristic impedance changes in the transmission path. A part of the transmission signal leaks at the discontinuity point, and the electromagnetic wave leaks weakly from the outer surface of the sheath tube 10 to the outside.
- the signal change B accompanying this electromagnetic wave leakage is taken into the receiver 36 via the antenna 35.
- the characteristic impedance ⁇ of the filled sound portion (no void) of the grout is as follows.
- the reflection coefficient m when two lines with different characteristic impedances are reflected is expressed by Fig. 12 (2).
- Sheath tube inner diameter D 50mm
- Characteristic impedance Z of the filled part of grout Z 48 ⁇
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010014451A (ja) * | 2008-07-01 | 2010-01-21 | Railway Technical Res Inst | 連結手段の空隙の充填状態非破壊検査方法 |
CN104502419B (zh) * | 2014-12-19 | 2017-05-03 | 西南石油大学 | 一种自愈合水泥自愈合能力的评价装置及方法 |
CN110068611A (zh) * | 2019-05-14 | 2019-07-30 | 山东住工装配建筑有限公司 | 智能检测注浆装置及检测方法 |
CN113624810A (zh) * | 2020-05-09 | 2021-11-09 | 广州市市政工程试验检测有限公司 | 一种基于电容法的套筒灌浆密实度检测装置及方法 |
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JPH0933379A (ja) * | 1995-07-14 | 1997-02-07 | Tokyo Gas Co Ltd | 電磁波による管の検査方法 |
JPH1054140A (ja) * | 1996-08-09 | 1998-02-24 | Hihakai Kensa Kk | グラウトの充填状態検査方法 |
JPH1062361A (ja) * | 1996-08-19 | 1998-03-06 | Toshiba Corp | 配管設備の異常検出方法及び異常診断装置 |
JPH10123105A (ja) * | 1996-10-23 | 1998-05-15 | Sumitomo Constr Co Ltd | グラウトの充填性評価方法 |
JP2000105227A (ja) * | 1998-09-30 | 2000-04-11 | Metropolitan Expressway Public Corp | プレストレスコンクリートのグラウト充填度診断方法及び装置 |
JP2002039979A (ja) * | 2000-07-19 | 2002-02-06 | Tohoku Techno Arch Co Ltd | Pc鋼材のグラウト充填時における気泡検出装置 |
JP2004108964A (ja) * | 2002-09-19 | 2004-04-08 | Abekogyosho Co Ltd | グラウト類の充填確認方法および装置 |
JP7068763B2 (ja) * | 2019-05-31 | 2022-05-17 | 三菱電機株式会社 | 衛星コンステレーション形成システム、衛星コンステレーション形成方法、衛星コンステレーション、および地上装置 |
-
2005
- 2005-11-08 WO PCT/JP2005/020464 patent/WO2006049303A1/ja active Application Filing
- 2005-11-08 JP JP2006542471A patent/JPWO2006049303A1/ja active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0933379A (ja) * | 1995-07-14 | 1997-02-07 | Tokyo Gas Co Ltd | 電磁波による管の検査方法 |
JPH1054140A (ja) * | 1996-08-09 | 1998-02-24 | Hihakai Kensa Kk | グラウトの充填状態検査方法 |
JPH1062361A (ja) * | 1996-08-19 | 1998-03-06 | Toshiba Corp | 配管設備の異常検出方法及び異常診断装置 |
JPH10123105A (ja) * | 1996-10-23 | 1998-05-15 | Sumitomo Constr Co Ltd | グラウトの充填性評価方法 |
JP2000105227A (ja) * | 1998-09-30 | 2000-04-11 | Metropolitan Expressway Public Corp | プレストレスコンクリートのグラウト充填度診断方法及び装置 |
JP2002039979A (ja) * | 2000-07-19 | 2002-02-06 | Tohoku Techno Arch Co Ltd | Pc鋼材のグラウト充填時における気泡検出装置 |
JP2004108964A (ja) * | 2002-09-19 | 2004-04-08 | Abekogyosho Co Ltd | グラウト類の充填確認方法および装置 |
JP7068763B2 (ja) * | 2019-05-31 | 2022-05-17 | 三菱電機株式会社 | 衛星コンステレーション形成システム、衛星コンステレーション形成方法、衛星コンステレーション、および地上装置 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010014451A (ja) * | 2008-07-01 | 2010-01-21 | Railway Technical Res Inst | 連結手段の空隙の充填状態非破壊検査方法 |
CN104502419B (zh) * | 2014-12-19 | 2017-05-03 | 西南石油大学 | 一种自愈合水泥自愈合能力的评价装置及方法 |
CN110068611A (zh) * | 2019-05-14 | 2019-07-30 | 山东住工装配建筑有限公司 | 智能检测注浆装置及检测方法 |
CN113624810A (zh) * | 2020-05-09 | 2021-11-09 | 广州市市政工程试验检测有限公司 | 一种基于电容法的套筒灌浆密实度检测装置及方法 |
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JPWO2006049303A1 (ja) | 2008-05-29 |
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