CN106197765B - A kind of immersed tube tunnel PC drag-line stress monitoring method - Google Patents
A kind of immersed tube tunnel PC drag-line stress monitoring method Download PDFInfo
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- CN106197765B CN106197765B CN201610559806.3A CN201610559806A CN106197765B CN 106197765 B CN106197765 B CN 106197765B CN 201610559806 A CN201610559806 A CN 201610559806A CN 106197765 B CN106197765 B CN 106197765B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/12—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress
- G01L1/127—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress by using inductive means
Abstract
The present invention provides a kind of immersed tube tunnel PC drag-line stress monitoring methods, it is characterized in that, after tube coupling docking, before PC cable tension, using open loop type magnetic flux cable wire stress meter as monitoring element, monitoring element is directly wound on cable wire, monitoring element can react cable wire stress variation according to magnetic flux change when PC drag-line telescopic variation, monitoring element connect magnetic flux data collecting instrument, it can be achieved that PC drag-line stress automatic monitoring.The present invention buries monitoring element directly on PC drag-line, does not need additionally to increase PC guy cable length, and monitoring element has replaceable condition.
Description
Technical field
The invention belongs to civil engineering structure safety monitoring fields, are related to a kind of immersed tube tunnel PC drag-line stress monitoring side
Method.
Background technique
To prevent joints of segment position from opening after the docking of immersed tube tunnel tube coupling, two adjacent tube couplings are drawn using PC drag-line
Tightly.PC drag-line is prestressing force multi beam steel strand wires, a part is first embedded in tube coupling inside concrete in work progress, in tube coupling pair
By two sides PC cable pull after connecing.Country's immersed tube tunnel PC drag-line stress routine monitoring method is in tube coupling prefabrication process at present
Steel wire anchorage cable stress meter is buried in PC stay cable end, PC drag-line stress is monitored after the docking of PC drag-line, such as
Drag-line prestressed monitoring method disclosed in CN104535234A.The method need to increase PC guy cable length, and be prefabricated in tube coupling
It is embedded in PC drag-line end in the process, monitoring element is easily damaged in tube coupling prefabrication process and during PC cable tension, and
Monitoring element is non-exchange.
This method mainly solves PC drag-line stress monitoring method and monitoring device tool under the conditions of not increasing PC guy cable length
The PC drag-line stress monitoring method of standby replaceable condition.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of immersed tube tunnel PC drag-line stress monitoring sides
Method.
The technical scheme adopted by the invention is that:
A kind of immersed tube tunnel PC drag-line stress monitoring method, which is characterized in that after tube coupling docking, before PC cable tension,
Using open loop type magnetic flux cable wire stress meter as monitoring element, monitoring element is directly wound on cable wire, monitoring element can
Cable wire stress variation is reacted according to magnetic flux change when PC drag-line telescopic variation, monitoring element connects magnetic flux data collecting instrument,
The automatic monitoring of PC drag-line stress can be achieved.
More particularly, the monitoring element is made of coil rack, induction coil, excitation coil, induction coil winding
On coil rack, excitation coil is wrapped on coil rack, and coil rack is aligned the cable wire for being linked in monitored PC drag-line
On, induction coil passes through core wire with excitation coil respectively and connects magnetic flux data collecting instrument, is adopted by magnetic flux data collecting instrument
The information for collecting induction coil and excitation coil reacts cable wire stress variation according to magnetic flux change.
More particularly, the middle section of coil rack opens up groove, and induction coil is wrapped in groove.
It further include buckle-type separated time protective device as optimal technical scheme, buckle-type separated time protective device separates PC drawing
Each cable wire of rope, buckle-type separated time protective device also act as the effect of support test equipment.
The buckle-type separated time protective device is supported together with lower support assembled by upper, shape between upper support and lower support
The through-hole passed through at the cable wire for PC drag-line is fixed between upper support and lower support by lock-screw, play instrument it is fixed and
Protection of instrumentation acts on when PC cable tension.
As optimal technical scheme, induction coil coiling step are as follows:
1) with a head in coil rack of fine enamelled wire around reserved line；
2) coil rack offers the groove of coiling induction coil, and is equipped with the ditch that coil rack end is passed to from groove
Fine enamelled wire is led to groove coiling from groove by slot, is considered as touring a, need around head from head around tail portion, then heavy-tailed portion
It is touring around two, it is desirable that a circle closely one encloses, close between line, pitch of the laps number foot；
3) touring around complete two, fine enamelled wire is drawn along same groove to coil rack head and is cut after reserved line；
4) fine enamelled wire at induction coil is coated with insulated paint, wraps up insulating paper thereafter.
As optimal technical scheme, excitation coil coiling step are as follows:
1) with a head in coil rack of thick enameled wire around reserved line.
2) that ditch grain that thick enameled wire enters from fine enamelled wire is drawn to coiling from excitation coil from head around tail portion,
Afterwards from tail portion around head, again from head around tail portion, finally directly amount to three great circles, it is desirable that one from the tail portion head Zhe Hui
Circle closely one encloses, tightly around circle number foot between line.
3) after turning back, thick enameled wire is led into coil rack head from the ditch grain entered, is cut after reserved line；
4) enameled wire thick at excitation coil is coated with insulated paint, wraps up empire cloth thereafter.
More particularly, after excitation coil and induction coil coiling, two reserved lines of excitation coil and induction coil
Two reserved lines are separately connected a core wire, and core wire shares four, and four core wires are connected to magnetic flux data collecting instrument.
More particularly, the reserved a part of four core wires come out from excitation coil and induction coil is folded and is pricked to cable wire
On.In this way during PC cable tension, core wire will not twist disconnected because of cable wire rotation.
More particularly, it is wrapped up four core wire joint solderings and with insulating cement, by the core wire connected with being glued to absolutely
On edge cloth, it is desirable that four core wires are just bumped into the groove outside coil rack when not shelling disconnected.
More particularly, excitation coil and induction coil are protected using pillar.
Based on the above method, the present invention also provides a kind of immersed tube tunnel PC drag-line monitor for stress, including monitoring member
Part and magnetic flux data collecting instrument, which is characterized in that the monitoring element is made of coil rack, induction coil, excitation coil,
Induction coil is wrapped on coil rack, and excitation coil is wrapped on coil rack, and coil rack alignment is linked in monitored
On the cable wire of PC drag-line, induction coil passes through core wire with excitation coil respectively and connects magnetic flux data collecting instrument.
The present invention uses PC drag-line stress monitoring element, after the docking of tube coupling sinking, directly draws in PC before PC cable tension
Monitoring element is buried on rope, does not need additionally to increase PC guy cable length, and monitoring element has replaceable condition.
Detailed description of the invention
Fig. 1 is that cross-section diagram is buried in PC drag-line monitoring point.
Fig. 2 is the 1-1 sectional view of Fig. 1.
Fig. 3 is monitoring element structural map.
Fig. 4 is protective device structural map.
Specific embodiment
The present invention is furture elucidated with preferred embodiment with reference to the accompanying drawing.
A kind of immersed tube tunnel PC drag-line stress monitoring method, which is characterized in that after tube coupling docking, before PC cable tension,
Using open loop type magnetic flux cable wire stress meter as monitoring element, monitoring element is directly wound on cable wire, monitoring element can
Cable wire stress variation is reacted according to magnetic flux change when PC drag-line telescopic variation, monitoring element connects magnetic flux data collecting instrument,
The automatic monitoring of PC drag-line stress can be achieved.
Specifically, the monitoring element is made of coil rack, induction coil, excitation coil, and induction coil is wrapped in
On coil rack, excitation coil is wrapped on coil rack.Coil rack alignment is linked on the cable wire of monitored PC drag-line,
Induction coil passes through core wire with excitation coil respectively and connects magnetic flux data collecting instrument, is acquired and is felt by magnetic flux data collecting instrument
The information for answering coil and excitation coil reacts cable wire stress variation according to magnetic flux change.
It further, further include buckle-type separated time protective device, buckle-type separated time protective device is by upper support and lower branch
Support fits together, and forms the through-hole that passes through of cable wire for PC drag-line between upper support and lower support, upper support and lower support
Between fixed by lock-screw, play the role of protection of instrumentation when instrument fixed and PC cable tension.
Embodiment 1
Referring to Figures 1 and 2, after tube coupling docking, before 1 tensioning of PC drag-line, layout type such as Fig. 1 of immersed tube tunnel PC drag-line
It is shown.Immersed tube tunnel PC drag-line stress monitoring method is as follows:
Step 1: installation buckle-type separated time protective device
Monitored cable wire is selected, buckle-type separated time protective device is locked on the monitored cable wire, two buttons are adjusted
Distance is between formula separated time protective device to meet the installation space of monitoring element.Shown buckle-type separated time protective device such as Fig. 4 institute
Show, fitted together by upper support 31 and lower support 32, the cable wire formed between upper support 31 and lower support 32 for PC drag-line is worn
The through-hole crossed, it is fixed by lock-screw 33 between upper support 31 and lower support 32.Inverted T shaped groove is opened up in the lower support 32,
The centre of inverted T shaped groove opens up half slot, and upper support 31 cooperates with inverted T shaped groove, and the lower surface of upper support 31 opens up half slot, upper branch
The half slot of support 31 and the half slot of lower support 32 form the through-hole passed through for cable wire, and the side of the lower support 32 opens up locking
Screw installation position, shape is cylindrical after 32 assembling of the upper support 31 and lower support.
Step 2: installation coil rack
Distance between two button separated time protective devices (bearing head) is adjusted to suitable, a pair of of coil rack 23 is aligned
It is linked on monitored cable wire, glue fixing seal is coated at gap.
Step 3: coiling induction coil (referring to Fig. 3)
1) with the head in coil rack 23 of fine enamelled wire (0.17mm) around the long reserved line of 8cm or so.
2) coil rack 23 offers the groove of coiling induction coil, and is equipped with the ditch that coil rack end is passed to from groove
Fine enamelled wire is led to groove coiling (fixation of taping) from groove by slot, and from head around tail portion, then heavy-tailed portion is around head,
It is considered as one touring, needs touring around two, it is desirable that an a circle closely circle, close, pitch of the laps number foot between line.
3) touring around complete two, by fine enamelled wire along same groove draw to coil rack head around 10cm reserve line after cut
Disconnected (adhesive tape is fixed).
4) fine enamelled wire at induction coil is coated with insulated paint, wraps up insulating paper (the fixed insulating paper of adhesive tape) thereafter.
Note: since coil rack 23 needs to rotate when coiling, so enameled wire needs port being wound on coil rack
Broken enameled wire with anti-rotation on head.
Step 4: coiling excitation coil (referring to Fig. 3)
1) with a head in coil rack 23 of thick enameled wire (0.47mm) around the long reserved line of 8cm or so.
2) that ditch grain that thick enameled wire enters from fine enamelled wire is drawn to coiling from excitation coil from head around tail portion,
Afterwards from tail portion around head, again from head around tail portion, finally directly from the tail portion head Zhe Hui (fixation of taping), Gong Jisan
Great circle a, it is desirable that circle closely one encloses, tightly around circle number foot between line.
3) turn back after, by roughly enameled wire from the ditch grain entered lead to coil rack head around 10cm reserve line after cut
(adhesive tape is fixed).
4) enameled wire thick at excitation coil is coated with insulated paint, wraps up empire cloth (the fixed empire cloth of adhesive tape) thereafter.
Step 5: wiring tests whether that coiling data are normal.
1) prepare one 1 meter long of 4 core wires 20 (red-black green Bai Sise) and strip both ends.
2) four enameled wires for being wound on skeleton head are taken off, 4 the end of a thread paints is scraped into 1cm long.
3) whether the enameled wire surveyed after paint is scraped with multimeter is connected.
4) four enameled wires are connected four core wires after conductive, and (8cm fine enamelled wire connects white 10cm fine enamelled wire and connects green, 8cm
Thick enameled wire connect the thick enameled wire of black 10cm connect it is red), be connected to magnetic flux data collecting instrument, integral voltage data by four core wires
Lower step can be carried out 0.38 to 0.6 otherwise to recoil.
5) it is wrapped up by joint soldering and with insulating cement, the line connected is required into four core wires not with being glued on empire cloth
In the disconnected recessed grain being just bumped into outside coil rack of stripping.
Step 6: encapsulating
1) it is placed 20 minutes after stirring evenly two kinds of resins (polyamide, epoxy resin) in the reconciliation of 0.9 to 1 ratio.
2) glue mixed up is uniformly applied to two half-sectional 21 insides of pillar.
3) two half-sectional pillars 21 for having applied glue are closed and just covers empire cloth in coil rack, tightened with two bands.
4) the reserved a part of four core wires 20 come out from excitation coil 22 and induction coil 24 is folded and is pricked to cable wire.
Note: moment acquisition data are wanted to remedy in time to prevent there is data problem in encapsulating.
Step 7: stablizing data before acquisition tensioning
Etc. 1) it is gelled after one day solid, stable five groups of data of acquisition magnetic flux.
2) four core wires 20 are arranged to tensioning sleeve inside built-in pipe.
Step 8: stablizing data after acquisition tensioning.
1) stablize five groups of data after acquiring tensioning.
2) specific test parameter is demarcated.
Step 9: real-time monitoring
According to the parameter of calibration, by magnetic flux data collecting instrument, the real-time stress of automatic collection cable wire changes.
Content describes embodiment of the invention (the red paddy Tunnel Engineering in Nanchang City) above, but is not absolutely to limit,
I.e. without departing from the scope and spirit of the present invention, industry technical staff can optimize instrument according to engineering practice
Method for embedding can make a variety of different modifications and variations to the present invention, belong to the protection scope of this patent.
Claims (5)
1. a kind of immersed tube tunnel PC drag-line stress monitoring method, which is characterized in that after tube coupling docking, before PC cable tension, adopt
It uses open loop type magnetic flux cable wire stress meter as monitoring element, monitoring element is directly wound on cable wire, monitoring element can root
Cable wire stress variation is reacted according to magnetic flux change when PC drag-line telescopic variation, monitoring element connects magnetic flux data collecting instrument, can
Realize the automatic monitoring of PC drag-line stress；The monitoring element is made of coil rack, induction coil, excitation coil, induction
Coil is wrapped on coil rack, and excitation coil is wrapped on coil rack, and coil rack alignment is linked in monitored PC and draws
On the cable wire of rope, induction coil passes through core wire with excitation coil respectively and connects magnetic flux data collecting instrument, passes through magnetic flux data
Acquisition Instrument acquires the information of induction coil and excitation coil, reacts cable wire stress variation according to magnetic flux change；Induction coil around
Step processed are as follows:
1) with a head in coil rack of fine enamelled wire around reserved line；
2) coil rack offers the groove of coiling induction coil, and is equipped with the groove that coil rack end is passed to from groove, will
Fine enamelled wire leads to groove coiling from groove, from head around tail portion, then from tail portion around head, be considered as it is one touring, need around
Two touring, it is desirable that a circle closely one encloses, close between line, pitch of the laps number foot；
3) touring around complete two, fine enamelled wire is drawn along same groove to coil rack head and is cut after reserved line；
4) fine enamelled wire at induction coil is coated with insulated paint, wraps up insulating paper thereafter.
2. immersed tube tunnel PC drag-line stress monitoring method according to claim 1, which is characterized in that will from excitation coil and
The reserved a part of four core wires that induction coil comes out, which folds, pricks to cable wire.
3. immersed tube tunnel PC drag-line stress monitoring method according to claim 1, which is characterized in that use buckle-type separated time
Protective device separates each cable wire of PC drag-line.
4. immersed tube tunnel PC drag-line stress monitoring method according to claim 3, which is characterized in that the buckle-type separated time
Protective device is by upper support together with lower support assembled, and formation is passed through for the cable wire of PC drag-line between upper support and lower support
Through-hole is fixed between upper support and lower support by lock-screw.
5. immersed tube tunnel PC drag-line stress monitoring method according to claim 1, it is characterised in that
Excitation coil coiling step are as follows:
1) with a head in coil rack of thick enameled wire around reserved line；
2) that ditch grain that thick enameled wire enters from fine enamelled wire is drawn to coiling from excitation coil from head around tail portion, after from
Tail portion is around head, again from head around tail portion, finally directly amounts to three great circles from tail portion fold-back head, it is desirable that a circle is tight
Suffer a circle, close, pitch of the laps number foot between line；
3) after turning back, thick enameled wire is led into coil rack head from the ditch grain entered, is cut after reserved line；
4) enameled wire thick at excitation coil is coated with insulated paint, wraps up empire cloth thereafter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610559806.3A CN106197765B (en) | 2016-07-15 | 2016-07-15 | A kind of immersed tube tunnel PC drag-line stress monitoring method |
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| CN201610559806.3A CN106197765B (en) | 2016-07-15 | 2016-07-15 | A kind of immersed tube tunnel PC drag-line stress monitoring method |
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| CN106197765B true CN106197765B (en) | 2019-03-29 |
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| CN109385956B (en) * | 2017-08-08 | 2023-05-26 | 尹恒 | Intelligent suspender or inhaul cable structure with built-in extension sensor for monitoring stress |
| CN108790140B (en) * | 2018-06-19 | 2020-09-25 | 湘潭大学 | Magnetic pipeline traction device |
| CN110132456A (en) * | 2019-05-23 | 2019-08-16 | 柳州欧维姆机械股份有限公司 | A kind of polyurea anti-corrosion antiknock magnetic flux transducer and preparation method thereof |
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| CN2874449Y (en) * | 2005-12-04 | 2007-02-28 | 中国矿业大学 | Magnetic spring stress sensor for detecting load |
| CN201351263Y (en) * | 2008-12-31 | 2009-11-25 | 柳州欧维姆机械股份有限公司 | Intelligent guy cable with magnetic flux sensor |
| CN102539027A (en) * | 2010-12-09 | 2012-07-04 | 杭州自动化技术研究院有限公司 | Magnetic measurement stress sensor with freely opened coils |
| US9146163B2 (en) * | 2012-12-28 | 2015-09-29 | General Electric Company | Proximity and strain sensing |
| US9212958B2 (en) * | 2012-12-28 | 2015-12-15 | General Electric Company | Non-contact magnetostrictive sensing systems and methods |
| CN205958151U (en) * | 2016-07-15 | 2017-02-15 | 中铁隧道集团二处有限公司 | Immersed tube tunnel PC cable measuring stress device |
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2016
- 2016-07-15 CN CN201610559806.3A patent/CN106197765B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2874449Y (en) * | 2005-12-04 | 2007-02-28 | 中国矿业大学 | Magnetic spring stress sensor for detecting load |
| CN201351263Y (en) * | 2008-12-31 | 2009-11-25 | 柳州欧维姆机械股份有限公司 | Intelligent guy cable with magnetic flux sensor |
| CN102539027A (en) * | 2010-12-09 | 2012-07-04 | 杭州自动化技术研究院有限公司 | Magnetic measurement stress sensor with freely opened coils |
| US9146163B2 (en) * | 2012-12-28 | 2015-09-29 | General Electric Company | Proximity and strain sensing |
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