CN103674735A - Test device for shear strength of composite pipe and test method - Google Patents
Test device for shear strength of composite pipe and test method Download PDFInfo
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- CN103674735A CN103674735A CN201310687039.0A CN201310687039A CN103674735A CN 103674735 A CN103674735 A CN 103674735A CN 201310687039 A CN201310687039 A CN 201310687039A CN 103674735 A CN103674735 A CN 103674735A
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Abstract
The invention relates to a test device for the shear strength of a composite pipe and a test method. The test device comprises a shear dual-ring board, a fixing ferreous ring and a plurality of hydraulic cylinders, wherein the shear dual-ring board adopts a retractable structure and is provided with a multi-step hole in the center; the fixing ferreous ring adopts a retractable ring-shaped board; the hydraulic cylinders are circumferentially arranged on the fixing ferrous ring, and the free ends of the hydraulic cylinders face the shear dual-ring board; pressure detection devices are arranged on the hydraulic cylinders. The test method comprises the steps including cutting a notch on the composite pipe to be tested, testing the pressure value prior to shear failure by using the test device, and calculating the shear strength. According to the test device for shear strength of composite pipe and the test method, provided by the invention, operation is simple, small space is occupied, and outdoor operation can be realized.
Description
Technical field
The present invention relates to testing device for shear strength, particularly relate to a kind of compound pipeline complex pipeline testing device for shear strength and method of testing.
Background technology
Along with scientific and technical development, central heating in region, cooling become heat supply, the cooling form of current main flow, thereby the appearance of the heat-preserving composite pipeline of trinity structure (outer pillar, heat-insulation layer, working steel tube) greatly reduces the loss of energy in transmitting procedure.
Nowadays the development along with urbanization constantly expands, and for the also expansion gradually of demand of heat-preserving composite pipeline, the heat-preserving composite pipeline quality detection apparatus arising at the historic moment is also in constantly more new development.
Yet, with regard to current heat-preserving composite pipeline testing device for shear strength, it is a kind of vertical pressure test, need to be vertical being placed on pressure testing machine of test compound pipeline, because the external diameter of compound pipeline complex pipeline is not of uniform size, thereby needed pressure testing machine is very huge, price is high, floor area is large and can not move, and test compound pipeline itself is because vertical placement test, working steel tube dead weight has just been brought the inaccuracy of measurement itself, and the preparation of laboratory sample needs the two ends of sample own vertical with compound pipeline complex pipeline axis according to right parallel and port, preparation for laboratory sample requires very high.For special testing requirement: detect the compound pipeline complex pipeline that the heat-preserving composite pipeline installed or length reaches more than 3m and have no idea to detect.
Summary of the invention
Because the existing defect of above-mentioned prior art, the object of the invention is to, provide a kind of simple to operate, floor area is little, compound pipeline complex pipeline testing device for shear strength and method of testing that can field work.
To achieve these goals, a kind of compound pipeline complex pipeline testing device for shear strength proposing according to the present invention, it comprises: shearing dual collar plate, is retractable structure, and center is provided with multi-stage stairs hole; Fixedly iron hoop, is open-close type annular slab; And a plurality of hydraulic cylinders, annular is arranged at this fixedly on iron hoop, and the free end of described a plurality of hydraulic cylinders is sheared dual collar plate towards this; On described hydraulic cylinder, be provided with pressure-detecting device.
The present invention also can be applied to the following technical measures to achieve further.
Aforesaid compound pipeline complex pipeline testing device for shear strength, it also comprises sawtooth iron plate ring, is connected to this fixedly opposing face of fixing this hydraulic cylinder of iron hoop.
Aforesaid compound pipeline complex pipeline testing device for shear strength, wherein said shearing dual collar plate comprises two and half ring flat-plates, and a contact jaw of this two and half ring flat-plate is pivotally connected, and another contact jaw connects with fixed head.
Aforesaid compound pipeline complex pipeline testing device for shear strength, wherein said fixedly iron hoop comprises two semi arch plates, these two semi arch plates interconnect with arc fixed iron piece; This fixedly iron hoop be welded with for fixing the hydraulic cylinder fastening base of this hydraulic cylinder.
Aforesaid compound pipeline complex pipeline testing device for shear strength, wherein said sawtooth iron plate ring is step ring, the internal diameter of every grade of ring is different.
Aforesaid compound pipeline complex pipeline testing device for shear strength, wherein said sawtooth iron plate ring, comprises that a side is that annular cover and the uniform welding of opening overlaps a plurality of butt pieces of a side in annular.
Aforesaid compound pipeline complex pipeline testing device for shear strength, wherein said a plurality of hydraulic cylinders are three to eight.
Aforesaid compound pipeline complex pipeline testing device for shear strength, wherein said a plurality of hydraulic cylinders are six.
Aforesaid compound pipeline complex pipeline testing device for shear strength, wherein said pressure-detecting device is tensimeter or pressure transducer.
To achieve these goals, according to the present invention, also propose a kind of compound pipeline complex pipeline method for testing shear strength, it comprises the following steps: tested compound pipeline complex pipeline is cut out to a kerf; Utilize aforesaid compound pipeline complex pipeline testing device for shear strength, the force value before test shear failure; Calculate shear resistance.
The present invention also can be applied to the following technical measures to achieve further.
Aforesaid compound pipeline complex pipeline method for testing shear strength, wherein said aforesaid compound pipeline complex pipeline testing device for shear strength, the force value before test shear failure utilized; Comprise the following steps: shearing dual collar plate is opened and is enclosed within outside working steel tube and closes tightly, will shear dual collar plate butt left side composite bed end face; Fixedly iron hoop is opened and is enclosed within outside working steel tube and closes tightly, fixedly iron hoop plate face butt right side composite bed end face; Hydraulic cylinder one end is fixed on fixedly on iron hoop, and free end is connected to the dual collar plate face of shearing; And under the driving of power source, keep the thrust of each hydraulic cylinder to increase progressively identical, read the manometric force value of hydraulic cylinder.
Aforesaid compound pipeline complex pipeline method for testing shear strength, wherein also comprises: sawtooth iron plate ring is fixedly set between iron hoop and right side composite bed end face, for testing the shear resistance between outer pillar and polyurethane foam.
Aforesaid compound pipeline complex pipeline method for testing shear strength, during wherein said compound pipeline complex pipeline excision otch, usage level chi, guarantees the axial vertical of the otch of excision and the compound pipeline complex pipeline of test; Service precision is the length that the ruler of 0.01mm is measured otch, prolongs hoop measurement number of times and is no less than 3 times, and the deviation of the length of each measurement result and setting is in 0.1cm; The froth bed of the otch end face after otch is used scraper polishing, so that otch is smooth.
Aforesaid compound pipeline complex pipeline method for testing shear strength, also comprises tester before the force value before test shear failure: open pressure transducer and determine that the pressure sensor readings of each hydraulic cylinder is zero; The transmission switch of all hydraulic cylinder is opened in start, and the unlatching size of transmission switch is all identical, and the size of unlatching is 60%; The hydraulic cylinder works length normal and that hydraulic cylinder extends in same time of determining all unlatchings is all identical.
The present invention compared with prior art has obvious advantage and beneficial effect.By technique scheme, compound pipeline complex pipeline testing device for shear strength of the present invention and method of testing, at least have following advantages:
One. compound pipeline complex pipeline testing device for shear strength of the present invention and method of testing, can detect the compound pipeline complex pipeline shear strength at any place of having welded, convenient, flexible.
Two. compound pipeline complex pipeline testing device for shear strength of the present invention and method of testing, can detect the compound pipeline complex pipeline shear strength of operation a period of time, and need not wholely break the compound pipeline complex pipeline system of changing, the polyurethane foam destroying can be sent out full outer welding hot melt oversleeve or thermal shrinkage oversleeve is installed with mould foaming, does not affect the operation of compound pipeline complex pipeline.
Three. compound pipeline complex pipeline testing device for shear strength of the present invention and method of testing, simple to operate, do not need large-scale detecting instrument, floor area is little.
Four. compound pipeline complex pipeline testing device for shear strength of the present invention and method of testing, only need to detect the corresponding jig external diameter of compound pipeline complex pipeline and the jig of internal diameter, without laboratory operation again.Field project installation is completely applicable.
Five. compound pipeline complex pipeline testing device for shear strength of the present invention and method of testing, can independent measurement polyurethane foam and working steel tube between shear resistance, also can independent measurement polyurethane foam and outer jacket between shear resistance, also can measure by two shear strengths simultaneously simultaneously.
Accompanying drawing explanation
Fig. 1 is the use view of compound pipeline complex pipeline testing device for shear strength of the present invention preferred embodiment.
Fig. 2 is the schematic perspective view of the shearing dual collar plate of compound pipeline complex pipeline testing device for shear strength of the present invention preferred embodiment.
Fig. 3 is that the hydraulic cylinder of compound pipeline complex pipeline testing device for shear strength of the present invention preferred embodiment is installed on the fixedly schematic perspective view of iron hoop.
Fig. 4 is the schematic perspective view of the sawtooth iron plate ring of compound pipeline complex pipeline testing device for shear strength of the present invention preferred embodiment.
Embodiment
For further setting forth the present invention, reach technological means and the effect that predetermined goal of the invention is taked, below in conjunction with accompanying drawing and preferred embodiment, to the compound pipeline complex pipeline testing device for shear strength and the method for testing that propose according to the present invention, its embodiment, step, structure, feature and effect thereof describe in detail.
Compound pipeline complex pipeline described in this case 10 comprises working steel tube 11 and is coated at least one deck composite bed 13,15 in working steel tube 11 outsides.Composite bed is for example heat-insulation layer 13, thermofin or outer pillar 15.
These described compound pipeline complex pipeline 10 shear resistances refer to the axial shear resistance of compound pipeline complex pipeline 10 each interlayer.
Referring to shown in Fig. 1, is the use view of compound pipeline complex pipeline testing device for shear strength of the present invention preferred embodiment.The testing device for shear strength of preferred embodiment of the present invention, comprises, shears dual collar plate 4, fixedly iron hoop 5 and a plurality of hydraulic cylinder 7.A plurality of hydraulic cylinder 7 annulars are arranged at fixedly on iron hoop 5, and the free end of hydraulic cylinder 7 is sheared dual collar plate 4 towards this.
This shears dual collar plate 4 is retractable structure.This shearing dual collar plate 4 comprises that a contact jaw pivot 43 of 41, two half ring flat-plates 41 of two and half ring flat-plates connects, and another contact jaw connects with fixed head 45.These shearing dual collar plate 4 centers are provided with coaxial multi-stage stairs hole 47, are two-stage stepped hole in the present embodiment, and diameter holes is corresponding to the external diameter of the working steel tube 1 of tested compound pipeline complex pipeline 10, and secondary apertures is corresponding to the external diameter of the outer pillar 15 of tested compound pipeline complex pipeline 10.In other embodiments, this multi-stage stairs hole 47 can be 3 grades or 4 grades of stepped holes, and every grade of circular hole aperture is corresponding to the external diameter of the different composite layer of tested complex pipe 10.
This fixedly iron hoop 5 be retractable structure, comprise that 51, two semi arch plates of two semi arch plates 51 rely on arc fixed iron piece 53 use bolts 55 fastening.Two semi arch plates 51 connections tighten together, and form a pertusate iron hoop in inside, and inner void diameter is greater than the working steel tube 11 of detected compound pipeline complex pipeline 10.This is fixedly on average welded with six hydraulic cylinder fastening bases 57 on iron hoop 5,57 one-tenth " 7 " fonts of each hydraulic cylinder fastening base, and inner hollow is used for fastening hydraulic cylinder 7, and with the fastening hydraulic cylinder 7 being placed in fastening base 57 of hydraulic cylinder fastening bolt 59.This fixedly the one side of not welding fastening base 57 of iron hoop 5 for being connected to a side otch end face of detected compound pipeline complex pipeline 10.
These hydraulic cylinder 7 annulars are arranged at this fixedly on iron hoop 5, at least one hydraulic cylinder 7, are provided with tensimeter or pressure transducer.In the present embodiment, be to be provided with tensimeter on each hydraulic cylinder.In this example, being provided with six hydraulic cylinders 7, can be three, four, five or five hydraulic cylinders in other embodiments.
Compound pipeline complex pipeline 10 testing device for shear strengths of the present embodiment, can also comprise sawtooth iron plate ring 6, and this sawtooth iron plate ring 6 is connected to fixedly immobile liquid cylinder pressure 7 opposing faces of iron hoop 5.This sawtooth iron plate ring 6 is step ring, and the internal diameter of every grade of ring is different.This sawtooth iron plate ring 6, comprises that a side is that the annular cover 61 of opening and uniform welding are at a plurality of butt pieces 63 of annular cover 61 1 sides; This annular cover 61 can overlap pillar 15 outsides outside, relies on fastening bolt 65 fastening; This butt piece 63 can be overlapped on outer pillar 3 end faces that are detected compound pipeline complex pipeline 10 otch and not be overlapped on heat-insulation layer 2 end faces.
Refer to Fig. 1, when compound pipeline complex pipeline 10 testing device for shear strengths of the present invention are used, first tested compound pipeline complex pipeline 10 is cut out to a kerf, the composite bed of compound pipeline complex pipeline 10 is removed, in the present embodiment, be that polyurethane foam 13, outer jacket 15 are removed, expose working steel tube 11.During compound pipeline complex pipeline 10 excision otch, usage level chi, guarantees the axial vertical of the otch of excision and the compound pipeline complex pipeline of test.Service precision is the length that the ruler of 0.01mm is measured otch, prolongs hoop measurement number of times and is no less than 3 times, and the deviation of the length of each measurement result and setting is in 0.1cm.Requiring the incision length of excision is 28cm.The PUR froth bed of the otch end face after otch is used scraper polishing, so that otch is smooth.
Then, shearing dual collar plate 4 is opened and is enclosed within outside working steel tube 11 and closes tightly, will shear dual collar plate 4 butts left side composite bed end faces.
Afterwards, fixedly iron hoop 5 is opened and is enclosed within outside working steel tube 1 and closes tightly, fixedly iron hoop 5 plate face butt right side composite bed end faces.
Afterwards, six hydraulic cylinder 7 one end are fixed on fixedly on iron hoop 5, and free end is connected to shears 4 of dual collar plates.And tester: open pressure transducer and determine that the pressure sensor readings of each hydraulic cylinder 7 is zero.The manometric pointer of readable pressure release of hydraulic pump is pulled back to 0 place.The transmission switch of all hydraulic cylinder is opened in start, and the unlatching size of transmission switch is all identical, and the size of unlatching is 60%.Determine each whole identical 10cm of being of the length that hydraulic cylinder works is normal and hydraulic cylinder extended in same time 30s that open all unlatchings of hydraulic pump.Tester repeats 3 times.
Finally, power source (as, hydraulic pump, scheme not shown) driving under, keep the thrust of each hydraulic cylinder 7 to increase progressively identical, manometric force value while reading delamination between polyurethane foam 2 and working steel tube 1, or between test polyurethane foam 2 and working steel tube 1, whether shear resistance meets predetermined strength.
After reading force value, according to following formula 1, calculate shear resistance:
τ=F/L* π * D formula 1
In formula 1:
τ---axial shear resistance, unit is MPa (MPa);
F---the power axially applying, unit is ox (N);
The length of L---bonding plane, unit is millimeter (mm);
D---diameter or the external diameter of the shear surface of surveying, unit is millimeter (mm)
In addition, during use, can also be in above-mentioned example, sawtooth iron plate ring 6 is fixedly set between iron hoop 5 and right side composite bed end face, for testing the shear resistance between outer pillar 15 and polyurethane foam 13.
One. compound pipeline complex pipeline testing device for shear strength of the present invention, can detect the compound pipeline complex pipeline shear strength at any place of having welded, convenient, flexible.
Two. compound pipeline complex pipeline testing device for shear strength of the present invention, can detect the compound pipeline complex pipeline shear strength of operation a period of time, and need not wholely break the compound pipeline complex pipeline system of changing, the polyurethane foam destroying can be sent out full outer welding hot melt oversleeve or thermal shrinkage oversleeve is installed with mould foaming, does not affect the operation of compound pipeline complex pipeline.
Three. compound pipeline complex pipeline testing device for shear strength of the present invention, simple to operate, do not need large-scale detecting instrument, floor area is little.
Four. compound pipeline complex pipeline testing device for shear strength of the present invention, only need to detect the corresponding jig external diameter of compound pipeline complex pipeline and the jig of internal diameter, without laboratory operation again, field project installation is completely applicable.
Five. compound pipeline complex pipeline testing device for shear strength of the present invention, can independent measurement polyurethane foam and working steel tube between shear resistance, also can independent measurement polyurethane foam and outer jacket between shear resistance, also can measure by two shear strengths simultaneously simultaneously.
Although the present invention discloses as above with preferred embodiment, so not in order to limit scope of the invention process, the simple equivalence of doing according to claims of the present invention and description changes and modifies, and still belongs in the scope of technical solution of the present invention.
Claims (15)
1. a compound pipeline complex pipeline testing device for shear strength, is characterized in that it comprises:
Shearing dual collar plate, is retractable structure, and center is provided with multi-stage stairs hole;
Fixedly iron hoop, is open-close type annular slab; And
A plurality of hydraulic cylinders, annular is arranged at this fixedly on iron hoop, and the free end of described a plurality of hydraulic cylinders is sheared dual collar plate towards this; On described hydraulic cylinder, be provided with pressure-detecting device.
2. compound pipeline complex pipeline testing device for shear strength as claimed in claim 1, is characterized in that it also comprises sawtooth iron plate ring, is connected to this fixedly opposing face of fixing this hydraulic cylinder of iron hoop.
3. compound pipeline complex pipeline testing device for shear strength as claimed in claim 1, is characterized in that wherein said shearing dual collar plate comprises two and half ring flat-plates, and a contact jaw of this two and half ring flat-plate is pivotally connected, and another contact jaw connects with fixed head.
4. compound pipeline complex pipeline testing device for shear strength as claimed in claim 1, is characterized in that wherein said fixedly iron hoop comprises two semi arch plates, and these two semi arch plates interconnect with arc fixed iron piece; This fixedly iron hoop be welded with for fixing the hydraulic cylinder fastening base of this hydraulic cylinder.
5. compound pipeline complex pipeline testing device for shear strength as claimed in claim 2, is characterized in that wherein said sawtooth iron plate ring is step ring, and the internal diameter of every grade of ring is different.
6. compound pipeline complex pipeline testing device for shear strength as claimed in claim 5, is characterized in that wherein said sawtooth iron plate ring, comprises that a side is that annular cover and the uniform welding of opening overlaps a plurality of butt pieces of a side in annular.
7. compound pipeline complex pipeline testing device for shear strength as claimed in claim 1, is characterized in that wherein said a plurality of hydraulic cylinder is three to eight.
8. compound pipeline complex pipeline testing device for shear strength as claimed in claim 7, is characterized in that wherein said a plurality of hydraulic cylinder is six.
9. compound pipeline complex pipeline testing device for shear strength as claimed in claim 1, is characterized in that wherein said pressure-detecting device is tensimeter or pressure transducer.
10. compound pipeline complex pipeline testing device for shear strength as claimed in claim 1, is characterized in that wherein said compound pipeline complex pipeline comprises working steel tube and is coated at least one deck composite bed in working steel tube outside.
11. 1 kinds of compound pipeline complex pipeline method for testing shear strength, is characterized in that it comprises the following steps:
Tested compound pipeline complex pipeline is cut out to a kerf;
The compound pipeline complex pipeline testing device for shear strength of utilization as described in claim 1 to 10 any one, the force value before test shear failure; And
Calculate shear resistance.
12. compound pipeline complex pipeline method for testing shear strength as claimed in claim 11, is characterized in that the compound pipeline complex pipeline testing device for shear strength of wherein said utilization as described in claim 1 to 10 any one, the force value before test shear failure; Comprise the following steps:
Shearing dual collar plate is opened and is enclosed within outside working steel tube and closes tightly, will shear dual collar plate butt left side composite bed end face;
Fixedly iron hoop is opened and is enclosed within outside working steel tube and closes tightly, fixedly iron hoop plate face butt right side composite bed end face;
Hydraulic cylinder one end is fixed on fixedly on iron hoop, and free end is connected to the dual collar plate face of shearing; And
Under the driving of power source, keep the thrust of each hydraulic cylinder to increase progressively identical, read the manometric force value of hydraulic cylinder.
13. compound pipeline complex pipeline method for testing shear strength as claimed in claim 12, is characterized in that wherein also comprising: sawtooth iron plate ring is fixedly set between iron hoop and right side composite bed end face, for testing the shear resistance between outer pillar and polyurethane foam.
14. compound pipeline complex pipeline method for testing shear strength as claimed in claim 11, while it is characterized in that wherein said compound pipeline complex pipeline excision otch, usage level chi, guarantees the axial vertical of the otch of excision and the compound pipeline complex pipeline of test; Service precision is the length that the ruler of 0.01mm is measured otch, prolongs hoop measurement number of times and is no less than 3 times, and the deviation of the length of each measurement result and setting is in 0.1cm; The froth bed of the otch end face after otch is used scraper polishing, so that otch is smooth.
15. compound pipeline complex pipeline method for testing shear strength as claimed in claim 11, is characterized in that, before the force value before test shear failure, also comprise tester: open pressure transducer and determine that the pressure sensor readings of each hydraulic cylinder is zero; The transmission switch of all hydraulic cylinder is opened in start, and the unlatching size of transmission switch is all identical, and the size of unlatching is 60%; The hydraulic cylinder works length normal and that hydraulic cylinder extends in same time of determining all unlatchings is all identical.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520862A (en) * | 2018-12-06 | 2019-03-26 | 哈尔滨工业大学 | A kind of tubing pure shear loading device and method |
| CN110132839A (en) * | 2019-04-19 | 2019-08-16 | 江苏大学 | Base of the one kind for composite bimetal pipe covers pipe interface bond strength testing mould and method |
| CN114166657A (en) * | 2021-11-22 | 2022-03-11 | 蚌埠市特种设备监督检验中心 | Device and method for testing shear strength of composite pipeline |
| CN114562633A (en) * | 2022-01-12 | 2022-05-31 | 广东大鹏液化天然气有限公司 | Online repair method and device for shearing resistance of composite material of pressure pipeline |
| CN116296900A (en) * | 2023-05-25 | 2023-06-23 | 四川职业技术学院 | Control system and method for measuring shear stress change of river bottom gas pipeline |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520862A (en) * | 2018-12-06 | 2019-03-26 | 哈尔滨工业大学 | A kind of tubing pure shear loading device and method |
| CN109520862B (en) * | 2018-12-06 | 2020-12-04 | 哈尔滨工业大学 | Pure shearing loading device and method for pipes |
| CN110132839A (en) * | 2019-04-19 | 2019-08-16 | 江苏大学 | Base of the one kind for composite bimetal pipe covers pipe interface bond strength testing mould and method |
| CN114166657A (en) * | 2021-11-22 | 2022-03-11 | 蚌埠市特种设备监督检验中心 | Device and method for testing shear strength of composite pipeline |
| CN114166657B (en) * | 2021-11-22 | 2023-07-25 | 蚌埠市特种设备监督检验中心 | Device and method for testing shear strength of composite pipeline |
| CN114562633A (en) * | 2022-01-12 | 2022-05-31 | 广东大鹏液化天然气有限公司 | Online repair method and device for shearing resistance of composite material of pressure pipeline |
| CN116296900A (en) * | 2023-05-25 | 2023-06-23 | 四川职业技术学院 | Control system and method for measuring shear stress change of river bottom gas pipeline |
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