CN105444623A - Energy-gathered cutting device for all-size gas blasting test of gas transmission steel pipe - Google Patents
Energy-gathered cutting device for all-size gas blasting test of gas transmission steel pipe Download PDFInfo
- Publication number
- CN105444623A CN105444623A CN201510938519.9A CN201510938519A CN105444623A CN 105444623 A CN105444623 A CN 105444623A CN 201510938519 A CN201510938519 A CN 201510938519A CN 105444623 A CN105444623 A CN 105444623A
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- China
- Prior art keywords
- shell
- full
- cavity liner
- gas transmission
- blasting device
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/007—Explosive cutting or perforating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
Abstract
The invention discloses an energy-gathered cutting device for an all-size gas blasting test of a gas transmission steel pipe. The device comprises a shell; a conical medicine-shaped cover is arranged at the bottom of the shell; an inner cavity encircled by the shell and the medicine-shaped cover is an explosive bin for placing explosives; the section of the explosive bin is reversely V-shaped; the wall thickness of the medicine-shaped cover is smaller than the wall thickness of the shell; the taper angle of the top end of the medicine-shaped cover is 40-110 degrees; an electric detonator for blasting is mounted in the center of the upper side of the shell, and is remotely controlled to detonate; and the shell is mounted on a cut object through a clamp. The device is mounted on a crack initiation steel pipe; and the electric detonator is remotely controlled to detonate by a wire detonating mode. The energy-gathered cutting device is better in safety and higher in cutting efficiency. The energy-gathered cutting device is suitable for X80-X100 pipeline steel with a thickness of 16.3 mm, and guarantees to introduce a penetration type initial crack with a length of 500 mm in the center part of the upper side of the crack initiation steel pipe in the all-size gas blasting test. The tip of the introduced penetration type initial crack is sharp; the crack is narrower; and the width is not more than 10 mm.
Description
[technical field]
The invention belongs to blast cutting field, relate to a kind of device for gas transmission pipe cutting, specifically a kind of gas transmission pipe full-scale gas blast test cumulative blasting device.
[background technology]
Natural gas is a kind of clean energy resource, is also a kind of inflammable, explosive danger medium, and high pressure gas pipeline, once long-range cracking will cause huge disaster and loss, therefore must ensure the security of pipeline.In order to improve the economy of pipeline transportation, the development trend of natural gas line is high pressure, heavy caliber, large wall thickness, large throughput rate, and the steel pipe of employing is also thereupon to Hi-grade steel (high intensity levels) future development.Natural gas line with pipeline steel tube development in recent years quickly, X70 rank steel pipe is in transfering natural gas from the west to the east one line successful Application, and the second west to east gas pipeline project pipeline engineering adopts the steel pipe of X80 rank on a large scale.Actively researching and developing the engineer applied problem of the high-grade pipe line steels such as X90, X100 at present.
Along with the grade of steel of pipe line steel, caliber and design ratio improve constantly, high pressure gas pipeline is generally in ductile fracture feature.The arrest toughness of tubing is the tolerance of material repels Ductile crack growth ability, needs the toughness index of reasonable prediction and regulation pipe line steel.Once pipeline there occurs ductile fracture, the crack arrest ability of material itself can by the cut to lengthen of fracture within the specific limits.The so-called arrest toughness requirement specifying pipeline rightly, refers to the toughness that material has, can tolerate initial imperfection to greatest extent, again can crack arrest after ductile fracture crack initiation, can meet again the cost-effectiveness requirement of batch production tubing simultaneously.
For the mother metal arrest toughness required value of natural gas line, carry out large quantifier elimination in the world, obtain many arrest toughness Forecasting Methodologies.But to modern high-strength and high ductility pipeline steel tube (X80 and more than), there is limitation in existing crack arrest prediction method, correctly can not reflect the crack arrest characteristic of this high-strength tenacity material, therefore full-scale gas blast is tested to become and is determined pipe line steel arrest toughness method the most reliably.
Gas transmission pipe full-scale gas blast test general principle is, in the middle of test section, placing low toughness steel pipe splitting pipe as opening, open and split pipe arranged on both sides developmental tube, toughness mode from low to high is often taked to arrange, also can take to wait flexible fashion arrangement, split pipe by linear shaped cutter sweep and introduce initial crack research experiment opening.Gather all signals by instrumentation in process of the test, and carry out data processing and analysis.
Linear shaped cutter sweep, also referred to as beehive-shaped charge, cavity liner is wedge shape, is a kind of linear charge with metal liner utilizing beehive-shaped charge principle to make.Its principle is: when after explosive charge, after cavity liner is subject to explosive charge when forming the effect of the detonation product of HTHP, the metal of its inwall extrudes one piece of metal jet to powder charging bottom high-speed motion at symmetrical plane, has an effect and cut it with target.Cavity blasting cutting technique has at a high speed, efficient, easy to operate and not by advantages such as environment restrictions.Linear shaped cutter sweep is mainly used in civil blast, bomb disposal, cutting and military and space field.Being tending towards ripe to the research of cumulative blasting technology now, is generally design and manufacture appropriate linear cavity effect cutter according to requirement of engineering.In use, linear cavity effect cutter is placed on target object, for cutting.
[summary of the invention]
The object of the invention is to the problem solving above-mentioned prior art, a kind of gas transmission pipe full-scale gas blast test cumulative blasting device is provided, this device is mainly used in the full-scale gas blast test of gas transmission pipe, be placed in open and split steel pipe upper center position, introduce the crackle running through thickness of steel pipe of certain length, ensure that the test of full-scale gas blast is implemented smoothly.
For achieving the above object, the present invention is achieved by the following technical solutions:
Gas transmission pipe full-scale gas blast test cumulative blasting device, comprise shell, the bottom of shell arranges the cavity liner of taper; The inner chamber that shell and cavity liner surround is the magazine for laying explosive, and the cross section of magazine is reverse V-shaped; The wall thickness of described cavity liner is less than the wall thickness of shell; The cone angle on cavity liner top is 40 ° ~ 110 °; The electric cap for detonating is installed at shell upper center place, and is ignited by Remote; Shell is arranged in cut target by jig.
The present invention further improves and is:
The thickness of described shell is 2mm, and the thickness of cavity liner is 1.5mm.
Described shell and cavity liner are made by red copper.
The cone angle of described cavity liner is 100 °.
The length of described shell is 500mm.
The explosive charge of filling in described magazine is 100g ~ 300g, and powder charge line density is 300g/m.
Gap between the bottom surface of described cavity liner and cut target is 4 ~ 8mm.
The two ends, bottom of described shell are in being horizontally disposed with.
For an explosive for gas transmission pipe full-scale gas blast test cumulative blasting device, according to mass fraction meter, comprise the trinitrotoluene of the hexogen 3% ~ 5% of 95 ~ 97%.
Compared with prior art, the present invention has following beneficial effect:
Gas transmission pipe of the present invention full-scale gas blast test cumulative blasting device, runs through type initial crack with what realize splitting that steel pipe upper center position introduces certain length opening of testing of full-scale gas blast, ensures that the test of full-scale gas blast is implemented smoothly.During use, line style cumulative blasting device of the present invention is placed in open and splits on steel pipe, adopt line detonation mode, ignited by Remote electric cap.The cumulative blasting equipment safety of the present invention's design is better, and cutting efficiency is higher.The present invention is applicable to the thick X80-X100 pipe line steel of 16.3mm, guarantees that splitting steel pipe upper center position opening of testing of full-scale gas blast introduces and longly run through type initial crack for 500mm.That introduces runs through type initial crack tip relatively sharply, and crack width is narrow, is no more than 10mm.
Further, outer casing thickness of the present invention is larger than the thickness of cavity liner, can the jet of formation temperature, increases the action time of explosive surge.
Further, the cone angle of cavity liner of the present invention selects suitable 100 °, and cumulative angle is suitable, and jet shaped charge action is stablized, and can increase penetration depth.
Further, outer cover length of the present invention selects 500mm, and that can cut 500mm length on steel pipe runs through type initial crack, crack tip is sharp-pointed, crack width is narrower, is no more than 10mm, is applicable to the explosion bulge test use that wall thickness is X80-X100 pipe line steel of 16.3mm completely.
Further, bottom the present invention, two ends are level, and be convenient to cutter sweep laying on pipeline like this, intermediate gaps is convenient to powder charge.
[accompanying drawing explanation]
Fig. 1 is sectional view of the present invention.
Wherein: 1 is shell; 2 is magazine; 3 is cavity liner.
[detailed description of the invention]
Below in conjunction with accompanying drawing, the present invention is described in further detail:
See Fig. 1, the present invention mainly comprises three parts: shell 1, magazine 2 and cavity liner 3, and shell and cavity liner all adopt red copper, and outer casing thickness is 2mm, and cavity liner thickness is 1.5mm.Outer casing thickness is larger than the thickness of cavity liner, can increase the action time of explosive surge like this; Cone Angle of Liner α is 40 ~ 110 °; Cumulative blasting device length is 500mm; Explosive adopts the RDX (RDX) of heat-resisting high explosion velocity and a small amount of TNT (content of TNT is no more than 5%), and explosive charge is 150g, and its volume is little, easy to carry, heat-resisting and detonation velocity is high, cutting efficiency and effect better.Height of burst scope is 2 ~ 8mm; Employing medium line detonates, and by the mode of remote control, is ignited by electric cap.Bottom the present invention, two ends are level, and be convenient to cutter sweep laying on pipeline, intermediate gaps is convenient to powder charge.What present invention can be implemented in high-grade pipe line steel (X80-X100) the upper introducing 500mm length that wall thickness is 16.3mm runs through type initial crack, and crack tip is sharp-pointed, and crack width is narrower, is no more than 10mm.The present invention is middle part above pipe line steel, and electric cap is placed in middle part above linear shaped cutter sweep, is ignited by remote control mode, and security is better.
Principle of the present invention:
Major part gas transmission line buries in underground, is subject to the corrosion function of soil media for a long time, causes gas transmission pipe producing the defects such as some micro-cracks.When crack size is less than critical crack size, crackle can not be expanded; Only have when crack size is greater than critical crack size, crackle just can be expanded.
On pipeline, critical crack size computing formula is as follows:
σ
f＝σ
y+68.95(2)
CDL＝2C(5)
Wherein, r is the outer radius of pipe line steel, and t is the wall thickness of pipe line steel, and p is the operating pressure of pipe line steel, σ
ffor the flow stress of pipe line steel, σ
hfor the circumference stress of pipe line steel, σ
yfor the yield strength of pipe line steel, C is the half of crack length, and MT is the bulging factor.
Table 1 is for running through mode-Ⅲ crack critical dimension (2C) the calculated results, for the pipe line steel of different stage, it is general all at below 300mm that it runs through mode-Ⅲ crack critical dimension, adopts linear shaped cutter sweep to introduce long the running through type initial crack and can meet test needs completely of 500mm.
Table 1 runs through mode-Ⅲ crack critical dimension (2C) the calculated results
For X80-X100 pipe line steel that wall thickness is 16.3mm, the major parameter of linear shaped cutter sweep is as follows:
(1) shell and cavity liner: the housing of jet cutter is not only explosive and cavity liner provides protective effect; and housing quality can increase the action time of explosive surge; thus increase the gross energy passing to cavity liner, play a part positive to the Penetration Ability of jet.The material behavior of shell and cavity liner has direct impact to the formation of energy-gathering jetting and motion.The material manufacture that fusing point is high, density is large, dynamic plasticity is good and ductility is good should be selected.The present invention adopts red copper as the material making shell and cavity liner.Red copper has excellent physics and chemistry character, has good processing characteristics, Dao Re ﹑ ductility and corrosion resistance.
(2) thickness of shell and cavity liner: cover body is too thin, and jet quality is little, unstable, even can not form jet; Cover body is too thick, and the energy that cover body absorbs when collapsing under pressure distortion is comparatively large, and effluxvelocity is diminished.Outer casing thickness of the present invention is 2mm, and cavity liner thickness is 1.5mm.Outer casing thickness is larger than the thickness of cavity liner, can increase the action time of explosive surge like this.
(3) cone angle of cavity liner: cone angle is too little, then cumulative angle is too little, and jet shaped charge action is very unstable; Shaped charge action is very unstable; Cone angle is too large, then metal jet is formed and changes in running, and penetration depth reduces.The cone angle of cavity liner normally 40 ~ 110 °, the cone angle of cavity liner of the present invention is 100 °.
(4) length of linear shaped cutter sweep: for ensureing that the test of full-scale gas blast is implemented smoothly, need open split that steel pipe upper center position introduces certain length by linear shaped cutter sweep run through type initial crack.What full-scale gas blast test needed introducing 500mm to grow runs through type initial crack, and linear shaped cutter sweep length of the present invention is 500mm.
(5) explosive: explosive is the energy of power-assembling breaking armour, energy transferring administration type cover after explosive charge, cavity liner, at axis direction closed formation jet, carries out penetration cutting to target.And the detonation pressure of explosive is the main factor affecting penetration depth, detonation pressure is mainly determined by detonation velocity and density, and there is following relation:
In formula: ρ is degree of packing, D is detonation velocity.
Be applicable to the explosive of beehive-shaped charge, should meet the following conditions:
1) good processing performance and lower mechanical sensitivity is had;
2) higher detonation pressure and explosion velocity is had;
3) good security performance is had.If decomposing does not go out etchant gas, non-hygroscopic etc.
The RDX (RDX) that the present invention adopts degree of packing less and a small amount of trinitrotoluene (TNT) are as beehive-shaped charge, and the content of TNT is no more than 5%.Hexogen has another name called for cyclonite, chemical formula (CH2NNO2) 3, clear crystal, and fusing point is 200 DEG C, is the ring-type nitro that a kind of explosive force is very strong, and detonates easily, and heat-resisting, high explosion velocity is comprehensive splendid explosive.Explosive charge is generally 100-300g, and the present invention's explosive used is 150g, and powder charge line density is that the detonation velocity of 300g/m explosive of the present invention reaches 7800m/s.
(6) height of burst: refer to the gap between the bottom (i.e. cavity liner bottom surface) of flexible linear-shaped charge bag and cut target.On the one hand along with the increase of the height of burst, jet can be made to elongate, thus improve perforation and depth of cut; On the other hand, along with the increase of the height of burst, jet can produce radial dispersion and fracture trend, and penetration depth is reduced.Often kind of cumulative blasting device has a best height of burst.The scope of the linear shaped cutter sweep height of burst of the present invention is 6 ± 2mm.
(7) open quick-fried mode: the detonation mode of cumulative blasting device mainly contains three kinds, line detonates, end points is detonated, end face is detonated.Linear shaped cutter sweep is placed in open by the present invention splits pipe upper center position, and 1 No. 8 electric cap is placed in cumulative blasting device upper center position, adopts intermediate point detonation mode, is ignited by Remote.
Embodiment:
On October 27th, 2014, Guan Yan institute carrier pipe and Research on Safety Assessment cooperate to be successfully made in Dongtai City of Jiangsu Province X90 longitudinal submerged arc welded pipe with units concerned the full-scale gas blast of single tube test.This is the full-scale gas blast experiment of the domestic heavy caliber conveying steel pipe carried out first.Test outer diameter of steel pipes is 1219mm, and length is 12m, and wall thickness is 16.3mm.Test pressure is 12MPa, and pressure medium is air.
Full-scale gas blast test is that linear shaped cutter sweep is placed in steel pipe upper center position, adopts remote control electric cap to ignite.During use, be placed to open by line style cumulative blasting device of the present invention and split on steel pipe, electric cap is placed in middle part above linear shaped cutter sweep, is ignited by remote control mode, and security is better.That introduces runs through type initial crack Pass Test technical requirement, and initial crack is long is 500mm, and crack tip is relatively more sharp-pointed, and crack width is narrow, is no more than 10mm.The initial crack introduced is expanded rapidly on pipe line steel, finally causes gas transmission pipe to show as long-range ductile fracture feature.
Above content is only and technological thought of the present invention is described; protection scope of the present invention can not be limited with this; every technological thought proposed according to the present invention, any change that technical scheme basis is done, within the protection domain all falling into claims of the present invention.
Claims (9)
1. a gas transmission pipe full-scale gas blast test cumulative blasting device, is characterized in that, comprises shell (1), and the bottom of shell (1) arranges the cavity liner (3) of taper; The inner chamber that shell (1) and cavity liner (3) surround is the magazine (2) for laying explosive, and the cross section of magazine (2) is reverse V-shaped; The wall thickness of described cavity liner (3) is less than the wall thickness of shell (1); The cone angle on cavity liner (3) top is 40 ° ~ 110 °; The electric cap for detonating is installed at shell (1) upper center place, and is ignited by Remote; Shell (1) is arranged in cut target by jig.
2. gas transmission pipe according to claim 1 full-scale gas blast test cumulative blasting device, is characterized in that, the thickness of described shell (1) is 2mm, and the thickness of cavity liner (3) is 1.5mm.
3. gas transmission pipe according to claim 1 and 2 full-scale gas blast test cumulative blasting device, is characterized in that, described shell (1) and cavity liner (3) are made by red copper.
4. gas transmission pipe according to claim 1 and 2 full-scale gas blast test cumulative blasting device, is characterized in that, the cone angle of described cavity liner (3) is 100 °.
5. gas transmission pipe according to claim 1 full-scale gas blast test cumulative blasting device, is characterized in that, the length of described shell (1) is 500mm.
6. gas transmission pipe according to claim 1 full-scale gas blast test cumulative blasting device, is characterized in that, the explosive charge of filling in described magazine is 100g ~ 300g, and powder charge line density is 300g/m.
7. gas transmission pipe according to claim 1 full-scale gas blast test cumulative blasting device, is characterized in that, the gap between the bottom surface of described cavity liner (3) and cut target is 4 ~ 8mm.
8. gas transmission pipe according to claim 1 full-scale gas blast test cumulative blasting device, is characterized in that, the two ends, bottom of described shell (1) are in being horizontally disposed with.
9. for an explosive for the full-scale gas blast test of gas transmission pipe described in claim 1 or 6 cumulative blasting device, it is characterized in that, according to mass fraction meter, comprise the trinitrotoluene of the hexogen 3% ~ 5% of 95 ~ 97%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510938519.9A CN105444623A (en) | 2015-12-15 | 2015-12-15 | Energy-gathered cutting device for all-size gas blasting test of gas transmission steel pipe |
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| CN201510938519.9A CN105444623A (en) | 2015-12-15 | 2015-12-15 | Energy-gathered cutting device for all-size gas blasting test of gas transmission steel pipe |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106895753A (en) * | 2017-04-01 | 2017-06-27 | 中国人民解放军理工大学 | A kind of simple axial symmetry energy-gathering device and preparation method thereof |
| CN108375325A (en) * | 2017-12-05 | 2018-08-07 | 西安物华巨能爆破器材有限责任公司 | A kind of linear cumulative blasting device of pipeline |
| CN109211037A (en) * | 2018-09-11 | 2019-01-15 | 中国矿业大学 | A kind of underwater explosion cutting component and underwater explosion cutting method |
| CN110542354A (en) * | 2019-09-03 | 2019-12-06 | 南京理工大学 | Design method of energy-gathered charge supercavity projectile |
| CN111551087A (en) * | 2020-06-13 | 2020-08-18 | 新疆环疆爆破工程有限公司 | Linear energy-gathering cutter influenced by parallel pipelines and test method |
| CN115559560A (en) * | 2022-10-08 | 2023-01-03 | 江汉大学 | Dismantling method of steel reinforced concrete upright post |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106895753A (en) * | 2017-04-01 | 2017-06-27 | 中国人民解放军理工大学 | A kind of simple axial symmetry energy-gathering device and preparation method thereof |
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| CN109211037A (en) * | 2018-09-11 | 2019-01-15 | 中国矿业大学 | A kind of underwater explosion cutting component and underwater explosion cutting method |
| CN110542354A (en) * | 2019-09-03 | 2019-12-06 | 南京理工大学 | Design method of energy-gathered charge supercavity projectile |
| CN111551087A (en) * | 2020-06-13 | 2020-08-18 | 新疆环疆爆破工程有限公司 | Linear energy-gathering cutter influenced by parallel pipelines and test method |
| CN115559560A (en) * | 2022-10-08 | 2023-01-03 | 江汉大学 | Dismantling method of steel reinforced concrete upright post |
| US11892278B1 (en) | 2022-10-08 | 2024-02-06 | Jianghan University | Method for removing section steel concrete column |
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