CN2197653Y - Electric inductive stress sensor for measuring pile foundation - Google Patents
Electric inductive stress sensor for measuring pile foundation Download PDFInfo
- Publication number
- CN2197653Y CN2197653Y CN 94201017 CN94201017U CN2197653Y CN 2197653 Y CN2197653 Y CN 2197653Y CN 94201017 CN94201017 CN 94201017 CN 94201017 U CN94201017 U CN 94201017U CN 2197653 Y CN2197653 Y CN 2197653Y
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- China
- Prior art keywords
- strain transducer
- groove
- miniature
- inductance
- coil
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- Expired - Fee Related
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Abstract
The utility model relates to a big stain tool type electric inductive strain sensor for measuring pile foundation bearing capacities, which is characterized in that the utility model is composed of a miniature inductive strain sensor and a purpose made mechanical structure. The middle part of the purpose made mechanical structure is provided with a steel ring (7); both sides of the steel ring are provided with a support arm respectively; the support arms are provided with a circular hole (5) and a circular hole (9) respectively. A measuring base distance L is formed between the circular hole (5) and the circular hole (9); the support arms are respectively provided with a groove (6) and a groove (8) which are used for installing the miniature inductive strain sensor and a groove (10) which is used for connecting a cable. When actual measurement is adopted, two expansion screws pass through a base distance hole to fix the tool type electric inductive strain sensor on both sides of a pile body by the connection of three lead wires of the miniature inductive strain sensor and a meter.
Description
The invention belongs to the engineering detecting category, promptly the check of bearing capacity is carried out in various stakes for building (comprising prefabricated pile and bored concrete pile).
For the detection of bearing capacity, need obtain the dynamic strain value relevant with bearing capacity, conventional method is at the direct adhering resistance strain sheets in pile body both sides.It is time-consuming that this method requires operating personnel to have on-the-spot higher technology for applying (needing special training) trouble.Because resistance strain gage itself do not possess protection against the tide, waterproof ability, so must keep the pile body local desiccation during engineering measurement.Therefore be not suitable for moist water-logged ground and use, can not use, belong to a kind of method of backwardness in rainy season.What take the lead in this field at present is the sensor of U.S. PDA company; it is that resistance strain gage is sticked on steel loop both sides in the special physical construction; and protect with shell; and then the tool-type resistance strain sensor is installed on the pile body with swell fixture; domesticly also begin to adopt this method at present, the technology path is the same.
The objective of the invention is in order to solve sensor protection against the tide, waterproof and resistance strain sensor sensitivity problems such as low, work stable inadequately (because of enlargement factor needs very high) and technology for applying requirement height.Adopted inductance type to survey the principle of strain, combined with miniature inductance strain transducer and special physical construction.Thereby constitute big strain tool-type inductance strain transducer, this is a kind of new design, and it has utilized the highly sensitive of inductance strain transducer, working stability, but the moistureproof and waterproof performance has utilized special physical construction can repeat to load again, the easy and stable mechanical property of on-the-spot installation.Thereby opened up dynamically big strain detecting new way.
Its ultimate principle is: the miniature inductance strain transducer is installed in the center of special physical construction.When sensor is stressed, be subjected to produce distortion △ L on the force direction, the magnetic core that drives in the telefault moves, and also produces △ L, thereby reaches the measurement of strain, and its strain stress is expressed from the next.
ε＝ (△L)/(L)
L: be the measurement cardinal distance of tool-type sensor
Because of a series of premium properties such as tool-type inductance strain transducer has protection against the tide, waterproof, highly sensitive good linearity, and are reusable.Therefore it is different from the tool-type resistance strain sensor, and obtains diverse overall permanence.
Realize that structure embodiment provided by the present invention sees accompanying drawing.It is made up of miniature inductance strain transducer and special physical construction; The invention is characterized in special physical construction middle part be a steel loop 7., steel loop two is surveyed that sway brace is respectively arranged, respectively have a circular hole on the sway brace and 5., 9. form measurement cardinal distance L between two holes, respectively have the groove that the miniature inductance strain transducer is installed on the sway brace and 6. and 8. reach the groove (10) that stube cable is installed; The coil rack of miniature inductance strain transducer 3. reach coil 4. use 914 glues groove 8. in, connecting rod 1. reach magnetic core 2. use 914 glues groove 6. in, the magnetic core of connecting rod should be adjusted at coil rack geometric center position 3.; Miniature inductance strain transducer coil rack is oval tubular, thickness 0.1-0.5mm, the oval maximum gauge 3mm of place, length 20-40mm, coil has three extension lines, and the coil outside need not be packed again, and 4. two groups of individual layer telefaults have three extension line stube cables and detecting instrument.In the drawings, 1. the movable rod of inductance strain transducer is made by polyester or glass-reinforced plastic material.2. magnetic core is made by platinum Mo alloy or high magnetic stainless steel.Special physical construction, cardinal distance L can be 60-160mm according to different needs length.Whole special physical construction thickness is 10-25mm.7. be steel loop, diameter is φ 25-φ 40mm, when miniature inductance strain transducer and special physical construction are bonding, uses 914 glue, also uses 914 adhesive curings in groove (10) after three extension lines of telefault and cable connect.Whole taping process is simple, does not have very hi-tech requirement, and this point is different from steel loop both sides adhering resistance strain sheets and guide line and bothers like that.Assemble the back and with protecting sheathing 7. steel loop is reached that 8. 6. groove protect with groove in the steel loop supported on both sides arm, during actual measurement, pass the cardinal distance hole respectively with two swell fixtures and 5. and 9. tool-type inductance strain transducer is fixed in the pile body both sides.
The concrete method of using is, with weight the stake top is impacted, test an instrument by power and obtain the two-way strain signal from the tool-type inductance strain transducer of pile body both sides, the record measured waveform, and test making that instrument was equipped with by power and take the bearing capacity that the microcomputer automatic analyser is calculated stake.From a large amount of engineering measurement results, obtain good and correct waveform and reached designing requirement, be particularly suitable for rainy season at pile body both sides sensor installation, and on-the-spot loading and unloading easily, sensor can use repeatedly, when detecting a certain pile, can bore mounting hole in next one stake to be checked, be convenient to work continuously, necessary instrument need not resemble survey strain appliance requires that resistance strain gage constitutes and adjusts balance repeatedly and bring convenience to the operator in addition, and the advantage that these are unique makes the detection of bearing capacity of pile foundation that a kind of new method that has vitality arranged, thereby obtain in the whole nation more and more popularizing, improved the pile foundation detection level.
Claims (3)
1, a kind of engineering construction pile bearing capacity detects the big strain tool-type inductance strain transducer of usefulness, is made up of miniature inductance strain transducer and special physical construction; The invention is characterized in special physical construction middle part be a steel loop 7., steel loop two is surveyed that sway brace is respectively arranged, respectively have circular hole on the sway brace and 5. and 9. form measurement cardinal distance L between two holes, respectively have the groove that the miniature inductance strain transducer is installed on the sway brace and 6. and 8. reach the groove (10) that stube cable is installed; The coil rack of miniature inductance strain transducer 3. reach coil 4. use 914 glues groove 8. in, connecting rod 1. reach magnetic core 2. use 914 glues groove 6. in, the magnetic core of connecting rod should be adjusted at coil rack geometric center position 3.; Miniature inductance strain transducer coil rack is oval tubular, thickness 0.1-0.5mm, and the oval maximum gauge 3mm of place, length 20-40mm, coil have three extension lines, and the coil outside need not be packed again, three extension line stube cables and detecting instrument.
2, big strain tool-type inductance strain transducer according to claim 1, it is characterized in that special physical construction, cardinal distance L can be 60-160mm according to different needs length, and whole special physical construction thickness is 10-25mm, and steel loop diameter 7. is φ 25-φ 40mm.
3,2. big strain tool-type inductance strain transducer according to claim 1 is characterized in that inductance strain transducer magnetic core, is made by platinum Mo alloy or high magnetic stainless steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94201017 CN2197653Y (en) | 1994-01-11 | 1994-01-11 | Electric inductive stress sensor for measuring pile foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94201017 CN2197653Y (en) | 1994-01-11 | 1994-01-11 | Electric inductive stress sensor for measuring pile foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2197653Y true CN2197653Y (en) | 1995-05-17 |
Family
ID=33821206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94201017 Expired - Fee Related CN2197653Y (en) | 1994-01-11 | 1994-01-11 | Electric inductive stress sensor for measuring pile foundation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2197653Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105651823A (en) * | 2015-12-30 | 2016-06-08 | 河海大学 | Wharf's foundation pile damage detecting instrument underwater arrangement device, detection device and method |
| CN111426460A (en) * | 2020-04-14 | 2020-07-17 | 大连理工大学 | Mechanical structure accumulated fatigue damage monitoring sensor under normal load distribution rule, design method and monitoring method |
-
1994
- 1994-01-11 CN CN 94201017 patent/CN2197653Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105651823A (en) * | 2015-12-30 | 2016-06-08 | 河海大学 | Wharf's foundation pile damage detecting instrument underwater arrangement device, detection device and method |
| CN105651823B (en) * | 2015-12-30 | 2018-04-10 | 河海大学 | The underwater arrangement apparatus of Wharf Foundation Pile damage check instrument, detection means and method |
| CN111426460A (en) * | 2020-04-14 | 2020-07-17 | 大连理工大学 | Mechanical structure accumulated fatigue damage monitoring sensor under normal load distribution rule, design method and monitoring method |
| CN111426460B (en) * | 2020-04-14 | 2021-11-05 | 大连理工大学 | Mechanical structure accumulated fatigue damage monitoring sensor under normal load distribution rule, design method and monitoring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |