CN203929292U - A kind of prestress anchorage cable stress distribution proving installation - Google Patents
A kind of prestress anchorage cable stress distribution proving installation Download PDFInfo
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- CN203929292U CN203929292U CN201420353667.5U CN201420353667U CN203929292U CN 203929292 U CN203929292 U CN 203929292U CN 201420353667 U CN201420353667 U CN 201420353667U CN 203929292 U CN203929292 U CN 203929292U
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- prestress anchorage
- anchorage cable
- anchor head
- optical fiber
- temperature compensation
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Abstract
The utility model belongs to technical field of civil engineering, is specifically related to a kind of prestress anchorage cable stress distribution proving installation.It comprises FC/PC joint entrance, the outlet of FC/PC joint, anchor head Feng Mao Quan, sensor fibre, prestress anchorage cable, temperature compensation optical fiber, protective sleeve, cementing agent, baffle plate and anchor head; In described prestress anchorage cable, be provided with seven steel strand wires, outer ring is pvc pipe cover; Described temperature compensation optical fiber is provided with protective sleeve outward; Described sensor fibre and temperature compensation optical fiber are fixed on two inner sides of prestress anchorage cable, the U-shaped connection of both front ends by cementing agent symmetry; Described FC/PC joint entrance connects sensor fibre rear end and passes from anchor head Feng Mao Quan upside, and the outlet of FC/PC joint connects temperature compensation optical fiber rear end and passes from anchor head Feng Mao Quan downside; Described baffle plate is between anchor head and anchor head envelope anchor Quan.The advantages such as compared with prior art, prestress anchorage cable stress distribution proving installation described in the utility model has good stability, and precision is high, not easily damaged.
Description
Technical field
The utility model belongs to technical field of civil engineering, specifically, relates to a kind of prestress anchorage cable stress distribution proving installation.
Background technology
Prestress anchorage cable technology is widely used in the engineering fields such as slope reinforcement, and it has huge economic results in society.In side slope, by high strength steel strand is fixed in rock mass with heavily stressed state, improve the stability of side slope, reduce Rock And Soil distortion.
Bond stress and withdrawal resistance that prestress anchorage cable mainly relies on interior anchoring section grout to provide, a large amount of research datas confirms that the bond stress distribution in prestress anchorage cable regular length is extremely inhomogeneous, the near-end stress concentration phenomenon of anchoring section is serious, increase along with load, and before load reaches regular length distal-most end, will there is " bonding departs from " in prestressed anchor cable body-injecting cement paste interface or injecting cement paste-bed boundary, bond damage makes prestress anchorage cable can not give full play to ground bolting effect, can cause that larger stress is concentrated in interior anchor section, and may cause the damage of prestress anchorage cable.
At present, in engineering, to the stress monitoring of prestress anchorage cable, adopt conventional pull-out test to determine ultimate bearing capacity, whether check installation quality meets design requirement.The general prestressed tendon anchorage dynamemter that adopts, is arranged on prestressed tendon anchorage dynamemter between anchor head and anchor plate, monitoring prestress anchorage cable stress in use.Due to the variation of landform or rock mass, the stress direction of the effect of stress direction on prestress anchorage cable and dynamometer monitoring is variant, causes monitor stress to have error, the serious damage that may cause taseometer and lose monitoring capability.To prestress anchorage cable stress along the prestressed anchor cable body regularity of distribution, owing to lacking suitable detection technique and equipment, be short in understanding, at present, for monitoring the sensor of prestress anchorage cable stress-strain state, take resistance-type, steel chord type and inductance type transducer as main, with upper sensor, be easily subject to the impact of the extraneous rugged surroundings such as electromagnetic interference (EMI), acid and alkali corrosion and wet environment, measuring accuracy is low, has been difficult to real-time, the online and long term monitoring to prestress anchorage cable stress state.
Summary of the invention
For solving the problems of the technologies described above, the utility model provides a kind of good stability, and precision is high, not easily damaged prestress anchorage cable stress distribution proving installation.
A kind of prestress anchorage cable stress distribution proving installation described in the utility model, described device comprises FC/PC joint entrance 1, FC/PC joint outlet 2, anchor head Feng Mao Quan 3, sensor fibre 4, prestress anchorage cable 5, temperature compensation optical fiber 6, protective sleeve 7, cementing agent 8, baffle plate 11 and anchor head 12; In described prestress anchorage cable 5, be provided with seven steel strand wires 9, outer ring is by 10 protections of pvc pipe cover; The outer protective sleeve 7 that is provided with of described temperature compensation optical fiber 6; Described sensor fibre 4 and temperature compensation optical fiber 6 use cementing agent 8 symmetries are fixed on two inner sides of prestress anchorage cable 5, the U-shaped connection of both front ends; Described FC/PC joint entrance 1 connects sensor fibre 4 rear ends and passes from anchor head Feng Mao Quan 3 upsides, and FC/PC joint outlet 2 connects temperature compensation optical fiber 6 rear ends and passes from anchor head Feng Mao Quan 3 downsides; Described baffle plate 11 is between anchor head 12 and anchor head envelope anchor Quan 3.
A kind of prestress anchorage cable stress distribution proving installation described in the utility model, described sensor fibre 4 diameters are 2-3mm.
A kind of prestress anchorage cable stress distribution proving installation described in the utility model, described protective sleeve 7 is made for PU pipe or metal tube.
A kind of prestress anchorage cable stress distribution proving installation described in the utility model, described cementing agent 8 is alpha-cyanoacrylate ketone cementing agent or the epoxy adhesive of the bonding use of machine parts'precise.
A kind of prestress anchorage cable stress distribution proving installation described in the utility model, through type (1) can be eliminated the impact of temperature on fiber strain, is convenient to realize the monitoring to prestress anchorage cable distortion.
T＝CT(vb-vb0)+T0 (1)
In formula: T is temperature; C
tbrillouin shift-temperature coefficient for optical fiber; v
bbrillouin shift for optical fiber; v
b0and T
0be respectively Brillouin shift amount and the temperature of optical fiber original state.
On prestress anchorage cable, install after distributed sensing fiber, the sensor fibre of laying on many prestress anchorage cables is serially connected by optical cable, only need at one end measure monitoring when just many prestress anchorage cables can be realized, obtain prestress anchorage cable along the strain in axis direction any point, through type (2) calculates prestress anchorage cable axle power distribution curve:
σ
i＝Eε
i(2)
Through type (3) obtains prestress anchorage cable average shearing stress, by the strain value along axial adjacent 2 of prestress anchorage cable, obtains shearing stress distribution curve:
τj＝(εi+1-εi)EA/πDΔL (3)
In formula: σ
ifor prestress anchorage cable i point stress value, E is prestress anchorage cable elastic modulus, ε i is prestress anchorage cable i point strain value, τ j is the average shearing stress between prestress anchorage cable i point and i+1 point, A is prestress anchorage cable sectional area, D is prestress anchorage cable diameter, and Δ L is distance between adjacent two measuring points of prestress anchorage cable.
Compared with prior art, prestress anchorage cable stress distribution proving installation described in the utility model adopts Distributed Optical Fiber Sensing Techniques that prestress anchorage cable is out of shape and is monitored, sensor fibre provides prestress anchorage cable strain value accurately, temperature compensation optical fiber provides prestress anchorage cable temperature value accurately to revise strain, to obtain prestress anchorage cable actual forced status, as prestress anchorage cable axial stress, shear stress between prestress anchorage cable and binding material is along the prestressed anchor cable body regularity of distribution, and according to the abnormal conditions that occur, take corresponding treatment measures, instruct In Slope Engineering Design, construction and maintenance, and Upon Slope Stability is evaluated.In addition, adopt binder material effectively to protect sensor fibre, avoid the damage of sensor fibre, thereby extend its serviceable life.
Accompanying drawing explanation
Fig. 1: the sectional view of prestress anchorage cable stress distribution proving installation; Fig. 2: prestress anchorage cable stress distribution proving installation sectional view; 1-FC/PC joint entrance, the outlet of 2-FC/PC joint, 3-anchor head Feng Mao Quan, 4-sensor fibre, 5-prestress anchorage cable, 6-temperature compensation optical fiber, 7-protective sleeve, 8-cementing agent, 9-steel strand wires, 10-PVC pipe box, 11-baffle plate, 12-anchor head.
Embodiment
Below in conjunction with specific embodiment, prestress anchorage cable stress distribution proving installation described in the utility model is described further, but protection domain of the present utility model is not limited to this.
Embodiment 1
A prestress anchorage cable stress distribution proving installation, described device comprises FC/PC joint entrance 1, FC/PC joint outlet 2, anchor head Feng Mao Quan 3, sensor fibre 4, prestress anchorage cable 5, temperature compensation optical fiber 6, protective sleeve 7, cementing agent 8, baffle plate 11 and anchor head 12; In described prestress anchorage cable 5, be provided with seven steel strand wires 9, outer ring is pvc pipe cover 10; The outer protective sleeve 7 that is provided with of described temperature compensation optical fiber 6; Described sensor fibre 4 and temperature compensation optical fiber 6 use cementing agent 8 symmetries are fixed on two inner sides of prestress anchorage cable 5, the described FC/PC joint of the U-shaped connection of both front ends entrance 1 connects sensor fibre 4 rear ends and passes from anchor head Feng Mao Quan 3 upsides, and FC/PC joint outlet 2 connects temperature compensation optical fiber 6 rear ends and passes from anchor head Feng Mao Quan 3 downsides; Described baffle plate 11 is between anchor head 12 and anchor head envelope anchor Quan 3.; Described sensor fibre 4 diameters are 3mm; Described protective sleeve 7 is made for PU pipe; The alpha-cyanoacrylate ketone cementing agent that described cementing agent 8 is the bonding use of machine parts'precise.
Compared with prior art, prestress anchorage cable stress distribution proving installation described in the utility model adopts Distributed Optical Fiber Sensing Techniques that prestress anchorage cable is out of shape and is monitored, sensor fibre provides prestress anchorage cable strain value accurately, temperature compensation optical fiber provides prestress anchorage cable temperature value accurately to revise strain, to obtain prestress anchorage cable actual forced status, as prestress anchorage cable axial stress, shear stress between prestress anchorage cable and binding material is along the prestressed anchor cable body regularity of distribution, and according to the abnormal conditions that occur, take corresponding treatment measures, instruct In Slope Engineering Design, construction and maintenance, and Upon Slope Stability is evaluated.In addition, adopt binder material effectively to protect sensor fibre, avoid the damage of sensor fibre, thereby extend its serviceable life.
Claims (4)
1. a prestress anchorage cable stress distribution proving installation, it is characterized in that, described device comprises FC/PC joint entrance (1), the outlet of FC/PC joint (2), anchor head Feng Mao Quan (3), sensor fibre (4), prestress anchorage cable (5), temperature compensation optical fiber (6), protective sleeve (7), cementing agent (8), baffle plate (11) and anchor head (12); In described prestress anchorage cable (5), be provided with seven steel strand wires (9), outer ring is protected by pvc pipe cover (10); The outer protective sleeve (7) that is provided with of described temperature compensation optical fiber (6); Described sensor fibre (4) and temperature compensation optical fiber (6) are fixed on two inner sides of prestress anchorage cable (5), the U-shaped connection of both front ends by cementing agent (8) symmetry; Described FC/PC joint entrance (1) connects sensor fibre (4) rear end and passes from anchor head Feng Mao Quan (3) upside, and FC/PC joint outlet (2) connects temperature compensation optical fiber (6) rear end and passes from anchor head Feng Mao Quan (3) downside; Described baffle plate (11) is positioned between anchor head (12) and anchor head Feng Mao Quan (3).
2. a kind of prestress anchorage cable stress distribution proving installation according to claim 1, is characterized in that, described sensor fibre (4) diameter is 2-3mm.
3. a kind of prestress anchorage cable stress distribution proving installation according to claim 1, is characterized in that, described protective sleeve (7) is made for PU pipe or metal tube.
4. a kind of prestress anchorage cable stress distribution proving installation according to claim 1, is characterized in that, described cementing agent (8) is alpha-cyanoacrylate ketone cementing agent or the epoxy adhesive of the bonding use of machine parts'precise.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420353667.5U CN203929292U (en) | 2014-06-30 | 2014-06-30 | A kind of prestress anchorage cable stress distribution proving installation |
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| CN201420353667.5U CN203929292U (en) | 2014-06-30 | 2014-06-30 | A kind of prestress anchorage cable stress distribution proving installation |
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| CN203929292U true CN203929292U (en) | 2014-11-05 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535234A (en) * | 2014-12-29 | 2015-04-22 | 大连理工大学 | Optical fiber inhaul cable prestress monitoring method and sensor thereof |
| CN105928646A (en) * | 2016-07-15 | 2016-09-07 | 重庆交通大学 | Method for monitoring performance degradation state of stay cable anchor head based on fiber distributed measurement |
| CN106906824A (en) * | 2015-12-22 | 2017-06-30 | 中国水利水电科学研究院 | Distribution type fiber-optic prestressing force intellectual monitoring anchor cable |
| CN106969862A (en) * | 2016-07-18 | 2017-07-21 | 福州大学 | A kind of device for being used to monitor steel strand prestress loss |
| CN107165059A (en) * | 2017-04-07 | 2017-09-15 | 华侨大学 | A kind of construction method of the anti-bend reinforced device of bridge prestress high-strength steel cord |
| CN108072329A (en) * | 2017-12-26 | 2018-05-25 | 浙锚科技股份有限公司 | Steel strand wires intelligence rope |
| CN108221670A (en) * | 2018-02-13 | 2018-06-29 | 浙锚科技股份有限公司 | A kind of intelligent parallel steel wire rope suitable for suspension cable, suspension cable and sunpender rope |
| CN109184766A (en) * | 2018-08-30 | 2019-01-11 | 武汉理工大学 | A kind of high-strength mixed anchor rod/anchor rope in prestressing force diffused large aperture and construction method |
-
2014
- 2014-06-30 CN CN201420353667.5U patent/CN203929292U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535234A (en) * | 2014-12-29 | 2015-04-22 | 大连理工大学 | Optical fiber inhaul cable prestress monitoring method and sensor thereof |
| CN106906824A (en) * | 2015-12-22 | 2017-06-30 | 中国水利水电科学研究院 | Distribution type fiber-optic prestressing force intellectual monitoring anchor cable |
| CN106906824B (en) * | 2015-12-22 | 2020-10-09 | 中国水利水电科学研究院 | Distributed optical fiber prestress intelligent monitoring anchor cable |
| CN105928646A (en) * | 2016-07-15 | 2016-09-07 | 重庆交通大学 | Method for monitoring performance degradation state of stay cable anchor head based on fiber distributed measurement |
| CN105928646B (en) * | 2016-07-15 | 2018-07-24 | 重庆交通大学 | Suspension cable anchor head performance degradation state monitoring method based on distributed fiber optic sensing |
| CN106969862A (en) * | 2016-07-18 | 2017-07-21 | 福州大学 | A kind of device for being used to monitor steel strand prestress loss |
| CN107165059A (en) * | 2017-04-07 | 2017-09-15 | 华侨大学 | A kind of construction method of the anti-bend reinforced device of bridge prestress high-strength steel cord |
| CN108072329A (en) * | 2017-12-26 | 2018-05-25 | 浙锚科技股份有限公司 | Steel strand wires intelligence rope |
| CN108221670A (en) * | 2018-02-13 | 2018-06-29 | 浙锚科技股份有限公司 | A kind of intelligent parallel steel wire rope suitable for suspension cable, suspension cable and sunpender rope |
| CN108221670B (en) * | 2018-02-13 | 2024-03-01 | 浙锚科技股份有限公司 | Intelligent parallel steel wire rope suitable for stay ropes, suspension ropes and hanging rod ropes |
| CN109184766A (en) * | 2018-08-30 | 2019-01-11 | 武汉理工大学 | A kind of high-strength mixed anchor rod/anchor rope in prestressing force diffused large aperture and construction method |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20190630 |