CN103674735B - Device for shear strength of composite pipe and method of testing - Google Patents
Device for shear strength of composite pipe and method of testing Download PDFInfo
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- CN103674735B CN103674735B CN201310687039.0A CN201310687039A CN103674735B CN 103674735 B CN103674735 B CN 103674735B CN 201310687039 A CN201310687039 A CN 201310687039A CN 103674735 B CN103674735 B CN 103674735B
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Abstract
The present invention is relevant a kind of device for shear strength of composite pipe and method of testing.This proving installation comprises: shear dual collar plate, be retractable structure, center is provided with multi-stage stairs hole; Fixing iron hoop is open-close type annular slab; And multiple hydraulic cylinder, annular is arranged on this fixing iron hoop, and the free end of described multiple hydraulic cylinder is towards this shearing dual collar plate; Described hydraulic cylinder is provided with pressure-detecting device.This method of testing, first cuts out a kerf by tested compound pipeline complex pipeline; Utilize this proving installation, the force value before test shear failure; Finally calculate shear resistance.Device for shear strength of composite pipe of the present invention and method of testing, simple to operate, floor area is little, can field work.
Description
Technical field
The present invention relates to testing device for shear strength, particularly relate to a kind of device for shear strength of composite pipe and method of testing.
Background technology
Along with the development of science and technology, central heating in region, cooling become heat supply, the cooling form of current main flow, thus 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 along with the development of urbanization constantly expands, the demand for heat-preserving composite pipeline also expands gradually, and the heat-preserving composite pipeline quality detection apparatus arisen at the historic moment is also in constantly more new development.
But, a kind of vertical pressure test with regard to current heat-preserving composite pipeline testing device for shear strength, vertical for test compound pipeline is needed to be placed on pressure testing machine, because the external diameter of compound pipeline complex pipeline is not of uniform size, thus required 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 just brings the inaccuracy of measurement itself, and the preparation of laboratory sample needs the two ends of sample own according to right parallel and port is vertical with compound pipeline complex pipeline axis, preparation for laboratory sample requires very high.Testing requirement for special: the compound pipeline complex pipeline that the heat-preserving composite pipeline that detection has been installed or length reach more than 3m has no idea to detect.
Summary of the invention
Because defect existing for above-mentioned prior art, the object of the invention is to, provide a kind of simple to operate, floor area is little, can the device for shear strength of composite pipe of field work and method of testing.
To achieve these goals, a kind of device for shear strength of composite pipe proposed according to the present invention, it comprises: shear dual collar plate, be retractable structure, center is provided with multi-stage stairs hole; Fixing iron hoop is open-close type annular slab; And multiple hydraulic cylinder, annular is arranged on this fixing iron hoop, and the free end of described multiple hydraulic cylinder is towards this shearing dual collar plate; Described hydraulic cylinder is provided with pressure-detecting device.
The present invention also can be applied to the following technical measures to achieve further.
Aforesaid device for shear strength of composite pipe, it also comprises sawtooth iron plate ring, is connected to the opposing face fixing this hydraulic cylinder of this fixing iron hoop.
Aforesaid device for shear strength of composite pipe, 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 fixed head connects.
Aforesaid device for shear strength of composite pipe, wherein said fixing iron hoop comprises two semi arch plates, and these two semi arch plate arc fixed iron pieces are interconnected; This fixing iron hoop is welded with the hydraulic cylinder fastening base for fixing this hydraulic cylinder.
Aforesaid device for shear strength of composite pipe, wherein said sawtooth iron plate ring is step ring, and the internal diameter of every grade of ring is different.
Aforesaid device for shear strength of composite pipe, wherein said sawtooth iron plate ring, comprises annular sleeve and the multiple abutting blocks of uniform welding in annular sleeve side that side is opening.
Aforesaid device for shear strength of composite pipe, wherein said multiple hydraulic cylinders are three to eight.
Aforesaid device for shear strength of composite pipe, wherein said multiple hydraulic cylinders are six.
Aforesaid device for shear strength of composite pipe, wherein said pressure-detecting device is tensimeter or pressure transducer.
To achieve these goals, also propose a kind of compound pipeline complex pipeline method for testing shear strength according to the present invention, it comprises the following steps: tested compound pipeline complex pipeline is cut out a kerf; Utilize aforesaid device for shear strength of composite pipe, 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 utilizes aforesaid device for shear strength of composite pipe, the force value before test shear failure; Comprise the following steps: shearing dual collar plate is opened and is enclosed within working steel tube and close tight outward, will shear composite bed end face on the left of dual collar plate abutting; Fixing iron hoop is opened and is enclosed within working steel tube and close tight outward, will fix composite bed end face on the right side of the abutting of iron hoop plate face; Be fixed on hydraulic cylinder one end on fixing iron hoop, free end is connected to shears dual collar plate face; 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: between fixing iron hoop and right side composite bed end face, arrange sawtooth iron plate ring, for testing the shear resistance between outer pillar and polyurethane foam.
Aforesaid compound pipeline complex pipeline method for testing shear strength, uses surveyor's staff when wherein said compound pipeline complex pipeline excises otch, ensures the axial vertical of the compound pipeline complex pipeline of otch and the test of excising; Service precision is the length of the ruler measurement otch of 0.01mm, and prolong hoop pendulous frequency and be no less than 3 times, 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 uses scraper polishing, to make otch 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%; Determine that the hydraulic cylinder works of all unlatchings is normal and the length that hydraulic cylinder extends in same time is all identical.
The present invention compared with prior art has obvious advantage and beneficial effect.By technique scheme, device for shear strength of composite pipe of the present invention and method of testing, at least have following advantages:
One. device for shear strength of composite pipe of the present invention and method of testing, the compound pipeline complex pipeline shear strength at any place of having welded can be detected, convenient, flexible.
Two. device for shear strength of composite pipe of the present invention and method of testing, the compound pipeline complex pipeline shear strength running a period of time can be detected, and overall broken need not change compound pipeline complex pipeline system, the polyurethane foam destroyed can be sent out full outer welding hot melt oversleeve with mould foaming or install thermal shrinkage oversleeve, does not affect the operation of compound pipeline complex pipeline.
Three. device for shear strength of composite pipe of the present invention and method of testing, simple to operate, do not need large-scale detecting instrument, floor area is little.
Four. device for shear strength of composite pipe 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 the need to laboratory operation again.Field project installation is completely applicable.
Five. device for shear strength of composite pipe of the present invention and method of testing, independently can measure the shear resistance between polyurethane foam and working steel tube, also independently can measure the shear resistance between polyurethane foam and outer jacket, also can measure by two shear strengths simultaneously simultaneously.
Accompanying drawing explanation
Fig. 1 is the using state schematic diagram of device for shear strength of composite pipe preferred embodiment of the present invention.
Fig. 2 is the schematic perspective view of the shearing dual collar plate of device for shear strength of composite pipe preferred embodiment of the present invention.
Fig. 3 is the schematic perspective view that the hydraulic cylinder of device for shear strength of composite pipe preferred embodiment of the present invention is installed on fixing iron hoop.
Fig. 4 is the schematic perspective view of the sawtooth iron plate ring of device for shear strength of composite pipe preferred embodiment of the present invention.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to the device for shear strength of composite pipe proposed according to the present invention and method of testing, its embodiment, step, structure, feature and effect thereof describe in detail.
Compound pipeline complex pipeline 10 described in this case comprises working steel tube 11 and is coated at least one deck composite bed 13,15 outside working steel tube 11.Composite bed is such as heat-insulation layer 13, thermofin or outer pillar 15.
Compound pipeline complex pipeline 10 shear resistance described in this refers to the axial shear resistance of each interlayer of compound pipeline complex pipeline 10.
Referring to shown in Fig. 1, is the using state schematic diagram of device for shear strength of composite pipe preferred embodiment of the present invention.The testing device for shear strength of present pre-ferred embodiments, comprises, and shears dual collar plate 4, fixing iron hoop 5 and multiple hydraulic cylinder 7.Multiple hydraulic cylinder 7 annular is arranged on fixing iron hoop 5, and the free end of hydraulic cylinder 7 is towards this shearing dual collar plate 4.
This shearing dual collar plate 4 is retractable structure.The contact jaw pivot 43 that this shearing dual collar plate 4 comprises two and half ring flat-plate 41, two and half ring flat-plates 41 connects, and another contact jaw fixed head 45 connects.This shearing dual collar plate 4 center is provided with coaxial multi-stage stairs hole 47, is two-stage stepped hole in the present embodiment, and diameter holes corresponds to the external diameter of the working steel tube 1 of tested compound pipeline complex pipeline 10, and secondary apertures corresponds 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 corresponds to the external diameter of the different composite layer of tested complex pipe 10.
This fixing iron hoop 5 is retractable structure, comprises two semi arch plates, 51, two semi arch plates 51 and relies on arc fixed iron piece 53 bolt 55 fastening.Two semi arch plates 51 connections tighten together, and form a pertusate iron hoop in inside, inner void diameter is greater than the working steel tube 11 of detected compound pipeline complex pipeline 10.This fixing iron hoop 5 is on average welded with six hydraulic cylinder fastening bases 57, each hydraulic cylinder fastening base 57 one-tenth " 7 " font, inner hollow is used for fastening hydraulic cylinder 7, and with the fastening hydraulic cylinder 7 be placed in fastening base 57 of hydraulic cylinder fastening bolt 59.The one side of not welding fastening base 57 of this fixing iron hoop 5 is for being connected to the side otch end face of detected compound pipeline complex pipeline 10.
This hydraulic cylinder 7 annular is arranged on this fixing iron hoop 5, and at least one hydraulic cylinder 7 is provided with tensimeter or pressure transducer.That each hydraulic cylinder is provided with tensimeter in the present embodiment.Being provided with six hydraulic cylinders 7 in this example, can be three, four, five or five hydraulic cylinders in other embodiments.
Compound pipeline complex pipeline 10 testing device for shear strength of the present embodiment, can also comprise sawtooth iron plate ring 6, and this sawtooth iron plate ring 6 is connected to immobile liquid cylinder pressure 7 opposing face of fixing 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 annular sleeve 61 and the multiple abutting blocks 63 of uniform welding in annular sleeve 61 side that side is opening; This annular sleeve 61 can be overlapped outside outside pillar 15, relies on fastening bolt 65 fastening; Outer pillar 3 end face that this abutting block 63 can be overlapped on detected compound pipeline complex pipeline 10 otch is not overlapped on heat-insulation layer 2 end face.
Refer to Fig. 1, when compound pipeline complex pipeline 10 testing device for shear strength of the present invention uses, first tested compound pipeline complex pipeline 10 is cut out a kerf, the composite bed of compound pipeline complex pipeline 10 is removed, be that polyurethane foam 13, outer jacket 15 are removed in the present embodiment, expose working steel tube 11.Compound pipeline complex pipeline 10 uses surveyor's staff when excising otch, ensures the axial vertical of the compound pipeline complex pipeline of otch and the test of excising.Service precision is the length of the ruler measurement otch of 0.01mm, and prolong hoop pendulous frequency and be no less than 3 times, the deviation of the length of each measurement result and setting is in 0.1cm.Require that the incision length excised is 28cm.The PUR froth bed of the otch end face after otch uses scraper polishing, to make otch smooth.
Then, shearing dual collar plate 4 is opened and is enclosed within the outer also conjunction of working steel tube 11 tightly, shearing dual collar plate 4 is abutted left side composite bed end face.
Afterwards, fixing iron hoop 5 is opened and is enclosed within the outer also conjunction of working steel tube 1 tightly, iron hoop 5 plate face will be fixed and abut right side composite bed end face.
Afterwards, six hydraulic cylinder 7 one end are fixed on fixing iron hoop 5, and free end is connected to shears dual collar plate 4.And tester: open pressure transducer and determine that the pressure sensor readings of each hydraulic cylinder 7 is zero.The pointer of the readable vent pressure table 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%.The hydraulic cylinder works determining at every turn to open all unlatchings of hydraulic pump normal and in same time 30s hydraulic cylinder the length of extending is all identical is 10cm.Tester repeats 3 times.
Finally, power source (as, hydraulic pump, scheme not shown) driving under, the thrust of each hydraulic cylinder 7 is kept to increase progressively identical, read manometric force value during 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.
Shear resistance is calculated according to following formula 1 after reading force value:
τ=F/L* π * D formula 1
In formula 1:
τ---axial shear resistance, unit is MPa (MPa);
F---the power axially applied, unit is ox (N);
The length of L---bonding plane, unit is millimeter (mm);
D---survey diameter or the external diameter of shear surface, unit is millimeter (mm)
In addition, during use, in above-mentioned example, sawtooth iron plate ring 6 can also be set between fixing iron hoop 5 and right side composite bed end face, for testing the shear resistance between outer pillar 15 and polyurethane foam 13.
One. device for shear strength of composite pipe of the present invention, the compound pipeline complex pipeline shear strength at any place of having welded can be detected, convenient, flexible.
Two. device for shear strength of composite pipe of the present invention, the compound pipeline complex pipeline shear strength running a period of time can be detected, and overall broken need not change compound pipeline complex pipeline system, the polyurethane foam destroyed can be sent out full outer welding hot melt oversleeve with mould foaming or install thermal shrinkage oversleeve, does not affect the operation of compound pipeline complex pipeline.
Three. device for shear strength of composite pipe of the present invention, simple to operate, do not need large-scale detecting instrument, floor area is little.
Four. device for shear strength of composite pipe of the present invention, only needs to detect the corresponding jig external diameter of compound pipeline complex pipeline and the jig of internal diameter, and without the need to laboratory operation again, field project installation is completely applicable.
Five. device for shear strength of composite pipe of the present invention, independently can measure the shear resistance between polyurethane foam and working steel tube, also independently can measure the shear resistance between polyurethane foam and outer jacket, also can measure by two shear strengths simultaneously simultaneously.
Although the present invention discloses as above with preferred embodiment, so and be not used to limit scope of the invention process, the simple equivalence change done according to claims of the present invention and description with modify, still belong in the scope of technical solution of the present invention.
Claims (15)
1. a device for shear strength of composite pipe, is characterized in that it comprises:
Shear dual collar plate, be retractable structure, center is provided with multi-stage stairs hole;
Fixing iron hoop is open-close type annular slab; And
Multiple hydraulic cylinder, annular is arranged on this fixing iron hoop, and the free end of described multiple hydraulic cylinder is towards this shearing dual collar plate; In described multiple hydraulic cylinder, at least one hydraulic cylinder is provided with pressure-detecting device.
2. device for shear strength of composite pipe as claimed in claim 1, is characterized in that it also comprises sawtooth iron plate ring, is connected to the opposing face in the face of the fixing the plurality of hydraulic cylinder of this fixing iron hoop.
3. device for shear strength of composite pipe as claimed in claim 1, it is characterized in that wherein said shearing dual collar plate comprises two and half ring flat-plates, a contact jaw of this two and half ring flat-plate is pivotally connected, and another contact jaw fixed head connects.
4. device for shear strength of composite pipe as claimed in claim 1, it is characterized in that wherein said fixing iron hoop comprises two semi arch plates, these two semi arch plate arc fixed iron pieces are interconnected; This fixing iron hoop is welded with the hydraulic cylinder fastening base for fixing the plurality of hydraulic cylinder.
5. device for shear strength of composite pipe 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. device for shear strength of composite pipe as claimed in claim 5, is characterized in that wherein said sawtooth iron plate ring, comprises annular sleeve and the multiple abutting blocks of uniform welding in annular sleeve side that side is opening.
7. device for shear strength of composite pipe as claimed in claim 1, is characterized in that wherein said multiple hydraulic cylinders are three to eight.
8. device for shear strength of composite pipe as claimed in claim 7, is characterized in that wherein said multiple hydraulic cylinders are six.
9. device for shear strength of composite pipe as claimed in claim 1, is characterized in that wherein said pressure-detecting device is tensimeter or pressure transducer.
10. device for shear strength of composite pipe 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 outside working steel tube.
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 a kerf;
Utilize the device for shear strength of composite pipe as described in any one of claim 1 to 10, 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 device for shear strength of composite pipe of wherein said utilization as described in any one of claim 1 to 10, the force value before test shear failure; Comprise the following steps:
Shearing dual collar plate is opened and is enclosed within working steel tube and close tight outward, will shear composite bed end face on the left of dual collar plate abutting;
Fixing iron hoop is opened and is enclosed within working steel tube and close tight outward, will fix composite bed end face on the right side of the abutting of iron hoop plate face;
Be fixed on hydraulic cylinder one end on fixing iron hoop, free end is connected to shears dual collar plate face; 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: between fixing iron hoop and right side composite bed end face, arrange sawtooth iron plate ring, 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, use surveyor's staff when it is characterized in that wherein said compound pipeline complex pipeline excision otch, ensure the axial vertical of the compound pipeline complex pipeline of otch and the test of excising; Service precision is the length of the ruler measurement otch of 0.01mm, and prolong hoop pendulous frequency and be no less than 3 times, 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 uses scraper polishing, to make otch smooth.
15. compound pipeline complex pipeline method for testing shear strength as claimed in claim 11, is characterized in that, also comprise tester: open pressure transducer and determine that the pressure sensor readings of each hydraulic cylinder is zero before the force value before test shear failure; 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 that the hydraulic cylinder works of all unlatchings is normal and the length that hydraulic cylinder extends in same time is all identical.
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| 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 |
| 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 |
| CN116296900B (en) * | 2023-05-25 | 2023-07-25 | 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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