CN104138941B - A kind of method of flame simmering and bending large-diameter pipeline - Google Patents

A kind of method of flame simmering and bending large-diameter pipeline Download PDF

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CN104138941B
CN104138941B CN201410367605.4A CN201410367605A CN104138941B CN 104138941 B CN104138941 B CN 104138941B CN 201410367605 A CN201410367605 A CN 201410367605A CN 104138941 B CN104138941 B CN 104138941B
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pipe crimping
bending
heating
simmering
check
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CN201410367605.4A
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CN104138941A (en
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苏传才
马运广
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中国化学工程第三建设有限公司
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Abstract

The invention discloses a kind of method of flame simmering and bending large-diameter pipeline, belong to pipeline processing technical field.The steps include: preparation of construction, quality testing is carried out to pipe crimping and algorithm quantitative; Pipe crimping is rule, and supports pipe crimping and mark heating region with pipe crimping bracing or strutting arrangement on pipe crimping; Flame simmering and bending, along the simmering and bending of "the" shape route in the heating region pulled, and decide the length of simmering and bending time according to pipe crimping heat tone; Cooling checks, after pipe crimping cooling, detect the distance of the pipe crimping lower bottom part after simmering and bending and above-mentioned check-out console upper end whether in 3mm, it is qualified that distance is within the scope of 3mm; After-treatment, when actual pipe crimping bend action H1 and theoretical pipe crimping bend deviation between action H larger time, adopt gas welding roasting carrying out adjustment.The invention solves the problem that must use large-scale apparatus to large-diameter pipeline simmering and bending, utilize the characteristic of pipeline self gravitation and pipeline to carry out simmering and bending, to place and devices call not high, be applicable to multiple construction environment.

Description

A kind of method of flame simmering and bending large-diameter pipeline

Technical field

The present invention relates to pipeline processing technical field, more particularly, relate to a kind of method of flame simmering and bending large-diameter pipeline.

Background technology

In the construction of some large-scale construction engineerings, need to use major diameter bend pipe, the Main Function of major diameter bend pipe is as follows: one is structural mechanics effect, two is the directions changing pipeline, bend pipe the external environment such as the migration of buffering pipe on-site stratum, earthquake and variations in temperature can be attached to pulling force, pressure and torsional interaction power on straight tube, so the performance of bend pipe directly affects the reliability of construction quality and pipeline transportation, security and economy, therefore the process technology of bend pipe just seems especially important.And the making of bend pipe also has a variety of, according to the difference of bend pipe processing mode, can be divided into cold bending and hot-bending bends, cold bending directly to exert a force the bending radian or the angle that reach designing requirement to production tube; And hot-bending bends adopts suitable method to heat steel pipe, then flexural deformation is carried out, reach radian or the angle of designing requirement, because hot procedure can effectively reduce the impact of flexural deformation on steel tube performance, thus hot-bending bends is more suitable for the manufacture of larger radian or angle bend pipe, has wide range of applications.And bending generally rear by entirety heating in factory, the employing mechanical compression of large-diameter pipeline reaches, need special large-scale heater and large pressing machine tool, but take this kind of method at engineering site to the bending of large-diameter pipeline, equipment investment is large, and operating expenses is high.

Generally fire-heating elbow process program is all adopted in domestic construction engineering, such as Putuo District, Zhoushan Lu Jia temple bridge etc., but there is many defects in flame pipe bending technique, main manifestations is that firing rate is slow, heat uneven, consumption gas cost is large, work situation is poor, particularly easily affect the performance of steel pipe mother metal, also there is the technology of hot elbowing by inductive heating recently, such as Liaoyang pipe fitting research institute manufactures and designs successfully DN2000 × 150 × 9000mm heavy caliber medium-frequency pipe bender in grand celebration, and successful fire bending bends out bend pipe, bending radius is 4D, its wall thickness and diameter ratio reach more than 1: 100, but this special medium-frequency pipe bender can only in plant produced, field heat bending can not be carried out, there is the problem that long-distance transport is extremely inconvenient, and freight is larger.

Pass through patent retrieval, technical scheme about " heating simmering and bending pipeline " is existing open, such as: China Patent No. ZL201110160336.0, authorized announcement date is on December 21st, 2011, invention and created name is: a kind of method for producing hot-bending elbow, this invention relates to the pipe bending technique field of petroleum pipeline construction, comprises the steps: that (1) is selected to be applicable to carrying out the spiral seam submerged-arc welding pipe that eddy-current heating bends and managed as mother; (2) described spiral seam submerged-arc welding pipe is carried out the process of bend pipe bending technique; (3) spiral seam submerged-arc welding pipe through described bending technique process is heat-treated; (4) process of bend pipe pipe end will be carried out through heat treated spiral seam submerged-arc welding pipe.This technical scheme solves the technical problem of pipeline simmering and bending to a certain extent, reach pipeline simmering and bending effect, but also have a lot of drawback: step (2) bend pipe of technique scheme bends process and refers to thermal treatment zone pipeline being put into solid shape, heat while advance, although reach pipeline simmering and bending object, but simmering and bending region be fixedly difficult to the needs meeting multiple simmering and bending camber, and this hot bending method is too high to devices call, in much remote construction area, apparatus is difficult to be protected, and the difficulty of constructing in this approach is larger; And in the step of technique scheme (3), Quenching Treatment being carried out to pipeline, pipeline is easy brittle and distortion after carrying out Quenching Treatment, and simmering and bending precision can not get ensureing, so also need improvement further perfect.

And for example: China Patent No. ZL201010588241.4, authorized announcement date is on January 23rd, 2013, invention and created name is: a kind of intermediate frequency hot bending method for steel pipe, this invention belongs to Hydraulic and Hydro-Power Engineering field, have employed and special bend moulding bed, two ends fulcrum support steel pipe, two Frequency Induction Heating system equipments are adopted to carry out symmetry heating to steel pipe, centre hydraulic j ack mechanisms applies pressure to steel pipe, steel pipe inner arc is heated the contraction distortion of pressurized tube wall steel, is formed the stretched wire line style arch of designing requirement by technological means.The method protects again the performance of steel pipe mother metal while reaching simmering and bending object, but the method uses the apparatuses such as two cover Frequency Induction Heating systems, hydraulic jack, infrared thermography instrument, too high to devices call; And heating-up temperature is between 800 DEG C ~ 900 DEG C, the pipeline mouth of pipe also heats, and there occurs deformation, and this just connects Pipeline butt afterwards and brings difficulty and construction hidden danger; This pipeline relies on hydraulic jack to provide external force to make pipeline deformation in the process of heating, due to unbalance stress, is difficult to obtain Target pipe radian, both unsightly also makes troubles to construction, also needs improvement further perfect.

Summary of the invention

1. invent the technical problem that will solve

The object of the invention is to overcome in the prior art about " pipeline simmering and bending " deficiency relying on large-scale, precision instruments and simmering and bending precision, provide a kind of method of flame simmering and bending large-diameter pipeline, adopt technical scheme of the present invention, under the circumstances not having large-scale, precision instruments, high-precision simmering and bending can be carried out to pipeline.

2. technical scheme

For achieving the above object, technical scheme provided by the invention is:

The method of a kind of flame simmering and bending large-diameter pipeline of the present invention, it is characterized in that: the method first by algorithm H=a × (Sin α+Sin (2 α)+Sin (3 α)+... + Sin (n-1) α)+b × Sin (n α) carries out segmentation line to pipe crimping (1), re-use gas welding bake to line after pipe crimping (1) heat, because steel expand with heat and contract with cold and the effect of gravity, cooled pipe crimping (1) produces a certain amount of deformation, and after whether the detection of check-out console (8) on pipe crimping (1) bracing or strutting arrangement is qualified, determine whether pay again, after-treatment is carried out to underproof pipe crimping (1),

Specifically comprise following several step:

Step one, preparation of construction

The preparation of construction of step one comprises the pipe crimping course of receiving and pipe crimping fragmentation procedure, and the described pipe crimping course of receiving carries out quality testing to untreated pipe crimping, i.e. carrying out flaw detection pipe crimping weld seam, described pipe crimping fragmentation procedure is performed by following algorithm: H=a × (Sin α+Sin (2 α)+Sin (3 α)+... + Sin (n-1) α)+b × Sin (n α), in algorithm, α is that pipe crimping heats rear angle of bend at every turn, a is the heating spacing of pipe crimping, n is that the equidistant heating of pipe crimping side is counted, b is the tip length that pipe crimping does not heat, H is that after simmering and bending, pipe crimping bends action, L is the length of pipe crimping, wherein: α, b, L and H is known quantity, and have a=(L-2b)/(2n-1), the parameter of the steel beam column needed for engineering determines that total pipe crimping bends the value of action H Σ, namely show that every root pipe crimping bends the value of action H, then determine that the heating spacing a of every root pipe crimping and equidistant heating are counted n according to algorithm,

Step 2, pipe crimping are rule

Pipe crimping line is carried out after step one completes preparation of construction, the line of this pipe crimping comprises support process and scratching process, described support process is: lain in a horizontal plane in by pipe crimping on pipe crimping bracing or strutting arrangement, wherein: described pipe crimping bracing or strutting arrangement comprises the first bearing, second bearing, hold round rod member, check-out console and check-out console support, the first above-mentioned bearing and the second bearing lay respectively at below pipe crimping two ends, and the contact surface of the contact surface of the first bearing and pipe crimping and the second bearing and pipe crimping is concave surface, this concave recess degree matches with pipe crimping surface circular arc degree, the above-mentioned rod member that holds round snaps in pipe crimping two ends, and it is equal with tube diameter to hold round rod member length, prevent pipe crimping two ends from when heating, deformation occurring, above-mentioned check-out console Bracket setting is between the first bearing and the second bearing, and check-out console support one end is connected mutually with the first bearing, the other end is connected mutually with the second bearing, this check-out console support is equidistantly provided with multiple Card trough, above-mentioned check-out console quantity is multiple and has plurality of specifications, match with Card trough bottom check-out console, the height of this check-out console and directly over it after pipe crimping simmering and bending falling head match, directly over above-mentioned check-out console, after pipe crimping simmering and bending, falling head is drawn by the algorithm in step one, described scratching process be the heating determined according to algorithm in step one count n and heating spacing a mark heating region, this heating region is two isosceles triangles on a shared base, this isosceles triangle is upper base to heat reference line, and the summit of above-mentioned isosceles triangle is 30 ° ~ 45 °, below pipe crimping cross-sectional horizontal center line both sides places,

Step 3, flame simmering and bending

Flame simmering and bending can be carried out to pipe crimping after the pipe crimping line of completing steps two, the process of flame simmering and bending is as follows: gas welding is baked simmering and bending the mid point from heating reference line, every root pipe crimping adopts the gas welding of 4 same sizes roasting heating simultaneously, roasting of every two gas weldings are one group, two groups all synchronous successively from mid point heats to pipe crimping two ends, two gas weldings often organized are baked the symmetrical Synchronous Heating in base all along above-mentioned isosceles triangle, from the base of isosceles triangle, back and forth run to the summit of isosceles triangle by the base of "the" shape heating profiles from isosceles triangle, after roasting of gas welding moves to summit, two groups of gas weldings are baked heating to pipe crimping two ends successively other heating regions do not heated according to above-mentioned steps again, until all heating regions marked all pass through heating, the flame size of handle is baked in 4 above-mentioned gas weldings, firing rate, heated perimeter are consistent, during heating, temperature controls between 600 DEG C ~ 800 DEG C, the control of temperature range is embodied in: by visually observing, during heating, pipe crimping heating place surface occurs that cherry red shows that temperature reaches 600 DEG C, continue heating, show that temperature reaches 800 DEG C when pipe crimping heating place surface changes to orange colour, now should stop heating, move down, continue other heating region parts of heating by "the" shape heating profiles,

Step 4, cooling check

After flame simmering and bending step terminates, placement cooling processing is carried out to heated pipe crimping, until after room temperature, the deformation quantity at two edges upper and lower with pipe crimping respectively of the deformation quantity before heating after pipe crimping center line and cooling between pipe crimping center line is equal, bend action H1 to its pipe crimping again to check, inspection step is as follows: detect the distance of the pipe crimping lower bottom part after simmering and bending and above-mentioned check-out console upper end whether in 3mm, it is qualified that distance is within the scope of 3mm;

Step 5, after-treatment

After having checked, qualified pipe crimping can be delivered for use, following after-treatment is done to underproof pipe crimping: when actual pipe crimping bend action H1 and theoretical pipe crimping bend deviation between action H larger time, adopt gas welding roasting carrying out adjustment, the preferred location of adjustment is selected in deviate maximum point place, hot spot quantity and spacing are determined according to deviate size, and its process is: if actual measurement pipe crimping bend action H1 too small time, then exceed standard a little at this and increase hot spot between former hot spot; If actual measurement pipe crimping bend action H1 excessive time, exceed standard a little establish hot spot at this, the flame simmering and bending of above-mentioned steps three are repeated after selected hot spot, until actual pipe crimping bends the value H1 of action and theoretical pipe crimping bends the deviation of action H in 3mm, avoided roasting situation to occur in calibration procedures, pipe crimping qualified after adjustment can be delivered for use.

As further improvement of the present invention, the quantity of the check-out console in above-mentioned steps is at least 8, and the height of check-out console increases progressively from centre to both sides, and the upper extreme point connecting line of each check-out console is reclinate camber line.

As further improvement of the present invention, the pipe crimping tip length b in above-mentioned steps is 500 ~ 800mm.

3. beneficial effect

Adopt technical scheme provided by the invention, compared with prior art, there is following remarkable result:

(1) method of a kind of flame simmering and bending large-diameter pipeline of the present invention, under the characteristic of expanding with heat and contract with cold of steel and the double action of gravity, without the need to applying external force and large-scale, precision instruments can reach the object of pipeline being carried out to simmering and bending, simplifying operational procedure, having saved construction cost.

(2) method of a kind of flame simmering and bending large-diameter pipeline of the present invention, pipe crimping fragmentation procedure is performed by following algorithm: H=a × (Sin α+Sin (2 α)+Sin (3 α)+... + Sin (n-1) α)+b × Sin (n α), the size and number of heating region is drawn accurately according to this algorithm, and pipe crimping bracing or strutting arrangement provides instrument basis for simmering plumber's sequence, by the acting in conjunction of simmering and bending heating region and pipe crimping bracing or strutting arrangement, actual pipe crimping is bent, and error that action H1 and theoretical pipe crimping bend action H is no more than 3mm, and the use of pipe crimping bracing or strutting arrangement limits without place.

(3) a kind of heavy steel member preparation method based on flame simmering and bending of the present invention, heating region is delta-shaped region, and wide at the top and narrow at the bottom, makes the top deformation quantity of pipe crimping be greater than the deformation quantity of bottom, meets the standard that heavy steel member makes.

(4) method of a kind of flame simmering and bending large-diameter pipeline of the present invention, the equipment used is simply light, can meet the use under multiple construction environment.

Accompanying drawing explanation

Fig. 1 is the flow chart of the method for a kind of flame simmering and bending large-diameter pipeline of the present invention;

Fig. 2 is the structural representation of pipe crimping bracing or strutting arrangement in the present invention;

Fig. 3 is the left view of pipe crimping bracing or strutting arrangement in the present invention;

Fig. 4 is the expansion schematic diagram of heating region in the present invention.

Label declaration in schematic diagram:

1, pipe crimping; 2, heating region; 3, pipe crimping center line before heating; 4, pipe crimping center line after cooling; 5, reference line is heated; 61, the first bearing; 62, the second bearing; 7, rod member is held round; 8, check-out console; 9, check-out console support.

Detailed description of the invention

For understanding content of the present invention further, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

Embodiment 1

Method for heavy steel member bend pipe is divided into two kinds: cold bending and hot-bending bends.Due to factors such as heavy steel member own vol and use machineries, great majority adopt hot-bending bends technique, and hot-bending bends technique is also subdivided into several: utilize heavy caliber intermediate frequency hot bending machine bend pipe, first heat and extrude bend pipe, the first locally extruded rear integral solder bend pipe of simmering and bending etc. afterwards.Although existing hot-bending bends technology can reach the object of simmering and bending heavy steel member, drawback is also fairly obvious: requisitely will use large-scale apparatus, such as: intermediate frequency hot bending machine, hydraulic jack, infrared thermography instrument etc.It is worth noting: a lot of construction region is very remote, these large-scale apparatuses or be difficult to transport or cost of transportation high, bring very big inconvenience to construction, and construction precision is not high, transportation also has damage to steel beam column.

Applicant is on the basis of summing up heavy steel member construction experience in the past, off the beaten track, taking after simmering pipe utilizes pipeline self gravitation to reach the object of bend pipe, whole construction method all adopts small appliance and these small appliances are convenient to transport, are made simply, and the feasibility substantially increasing remote field construction again saves construction cost.

A kind of heavy steel member preparation method based on flame simmering and bending of the present embodiment, comprises preparation of construction, pipe crimping line, flame simmering and bending, cooling inspection and this five steps of after-treatment, its Specific construction process following (as shown in Figure 1):

Step one, preparation of construction

The preparation of construction of step one comprises pipe crimping 1 course of receiving and pipe crimping 1 fragmentation procedure, and described pipe crimping 1 course of receiving carries out quality testing to untreated pipe crimping 1, i.e. carrying out flaw detection pipe crimping 1 weld seam, described pipe crimping 1 fragmentation procedure is performed by following algorithm: H=a × (Sin α+Sin (2 α)+Sin (3 α)+... + Sin (n-1) α)+b × Sin (n α), in algorithm, α is the pipe crimping 1 rear angle of bend of heating at every turn, a is the heating spacing of pipe crimping 1, n is that the equidistant heating of pipe crimping 1 side is counted, b is the tip length that pipe crimping 1 does not heat, length is 500 ~ 800mm (be specifically 650mm at the present embodiment), H is that after simmering and bending, pipe crimping 1 bends action, L is the length of pipe crimping 1, wherein: α, b, L and H is known quantity, and have a=L-2b/2n-1, the parameter of the steel beam column needed for engineering determines that total pipe crimping bends action H Σvalue, namely show that every root pipe crimping bends the value of action H, then determine that the heating spacing a of every root pipe crimping 1 and equidistant heating are counted n according to algorithm,

Pipe crimping 1 course of receiving in the present embodiment comprises tests to the specification of pipe crimping 1 and quality, and pipe crimping 1 all has weld seam, and butt welded seam place will strengthen auditing standards, gets rid of and causes the making of heavy steel member not reach the factor of preassigned because of the reason of tubing self; The algorithm of pipe crimping 1 segmentation: H=a × (Sin α+Sin (2 α)+Sin (3 α)+... + Sin (n-1) α)+b × Sin (n α), this algorithm can pass through a lot of implement software, not only convenient but also quick, such as Microsoft Excel software etc.

Step 2, pipe crimping are rule

After step one completes preparation of construction, carry out pipe crimping 1 rule, the line of this pipe crimping 1 comprises support process and scratching process, described support process is: lain in a horizontal plane in by pipe crimping 1 on pipe crimping 1 bracing or strutting arrangement, wherein: described pipe crimping 1 bracing or strutting arrangement comprises the first bearing 61, second bearing 62, hold round rod member 7, check-out console 8 and check-out console support 9 are (as Fig. 2, shown in Fig. 3), the first above-mentioned bearing 61 and the second bearing 62 lay respectively at below pipe crimping 1 two ends, and the first bearing 61 is as concave surface with the contact surface of pipe crimping 1 and the contact surface of the second bearing 62 and pipe crimping 1, this concave recess degree matches with the surperficial radian of pipe crimping 1, the above-mentioned rod member 7 that holds round snaps in pipe crimping 1 two ends, and hold round rod member 7 length and pipe crimping 1 equal diameters, prevent pipe crimping 1 two ends from deformation occurring, above-mentioned check-out console support 9 is arranged between the first bearing 61 and the second bearing 62, and check-out console support 9 one end is connected mutually with the first bearing 61, the other end is connected mutually with the second bearing 62, this check-out console support 9 is equidistantly provided with multiple Card trough, above-mentioned check-out console 8 quantity is multiple and has plurality of specifications, match with Card trough bottom check-out console 8, the height of this check-out console 8 and directly over it after pipe crimping 1 simmering and bending falling head match, directly over above-mentioned check-out console 8, after pipe crimping 1 simmering and bending, falling head is drawn by the algorithm in step one and the quantity of check-out console 8 is at least 8, the height of check-out console 8 increases progressively from centre to both sides, the upper extreme point connecting line of each check-out console 8 is reclinate camber line, described scratching process be the heating determined according to algorithm in step one count n and heating spacing a mark heating region 2 (as shown in Figure 4), this heating region 2 is two isosceles triangles sharing a base, this isosceles triangle is upper base to heat reference line 5, and the summit of above-mentioned isosceles triangle is (specifically selecting 40 ° in the present embodiment) places, 30 ° ~ 45 °, below pipe crimping 1 cross-sectional horizontal center line both sides.Can be tangent topmost with check-out console 8 after declining after pipe crimping 1 simmering and bending directly over check-out console 8 in the present embodiment, by the setting of check-out console 8, after can being convenient to measure pipe crimping 1 simmering and bending, whether deformation quantity reaches preassigned; The setting holding round rod member 7 prevents pipe crimping 1 two ends that deformation occurs, and has discharged the assembled hidden danger of step 6.

Step 3, flame simmering and bending

Flame simmering and bending can be carried out to pipe crimping 1 after the pipe crimping line of completing steps two, the process of flame simmering and bending is as follows: gas welding is baked simmering and bending the mid point from heating reference line 5, every root pipe crimping 1 adopts the gas welding of 4 same sizes roasting heating simultaneously, two gas weldings are in opposite directions roasting being one group, and two groups all synchronous successively from mid point heats to pipe crimping two ends.Two gas weldings often organized are baked the symmetrical Synchronous Heating in base all along above-mentioned isosceles triangle, from the base of isosceles triangle, back and forth run to the summit of isosceles triangle by the base of "the" shape heating profiles from isosceles triangle, after roasting of gas welding moves to summit, two groups of gas weldings are baked heating successively along above-mentioned steps the heating region 2 that other do not heat again, until all heating regions 2 marked all pass through heating (as shown in Figure 4); The flame size of handle is baked in 4 above-mentioned gas weldings, firing rate, heated perimeter are consistent, during heating, temperature controls between 600 DEG C ~ 800 DEG C, the control of temperature range is embodied in: by visually observing, during heating, pipe crimping 1 heating place surface occurs that cherry red shows that temperature reaches 600 DEG C, continue heating, show that temperature reaches 800 DEG C when pipe crimping 1 heating place surface changes to orange colour, now should stop heating, move down, continue other heating region 2 parts of heating by "the" shape heating profiles; In the present embodiment, every root pipe crimping 1 adopts the gas welding of 4 same sizes roasting heating simultaneously, both ensure that efficiency of construction turn avoid with the area abnormal phenomenon that pipe crimping occurs when there being the heating time difference; During heating, temperature controls there is following reason between 600 DEG C ~ 800 DEG C: the deformation quantity after, pipe crimping 1 just can reach cooling at 600 DEG C ~ 800 DEG C in generating step one required for algorithm; Two, when 600 DEG C and 800 DEG C of these two temperature, the color change of pipe crimping 1 is comparatively obvious, is convenient to naked eyes and judges, more easily operate during heating.

Step 4, cooling check

After flame simmering and bending step terminates, placement cooling processing is carried out to heated pipe crimping 1, until after room temperature, deformation quantity before heating between pipe crimping center line 3 with pipe crimping center line 4 after cooling is equal with the deformation quantity at pipe crimping about 1 two edge respectively, bend action H1 to its pipe crimping 1 again to check, inspection step is as follows: detect the distance of pipe crimping 1 lower bottom part after simmering and bending and above-mentioned check-out console 8 upper end whether in 3mm, it is qualified that distance is within the scope of 3mm;

Step 5, after-treatment

After having checked, qualified pipe crimping 1 can be delivered for use, following after-treatment is done to underproof pipe crimping 1: when actual pipe crimping 1 bend action H1 and theoretical pipe crimping 1 bend deviation between action H larger time, adopt gas welding roasting carrying out adjustment, the preferred location of adjustment is selected in deviate maximum point place, hot spot quantity and spacing are determined according to deviate size, and its process is: if actual measurement pipe crimping 1 bend action H1 too small time, then exceed standard a little at this and increase hot spot between former hot spot; If actual measurement pipe crimping 1 bend action H1 excessive time, exceed standard a little establish hot spot at this, the flame simmering and bending of above-mentioned steps three are repeated after selected hot spot, until actual pipe crimping 1 bends the value H1 of action and theoretical pipe crimping 1 bends the deviation of action H in 3mm, avoided roasting situation to occur in calibration procedures, pipe crimping 1 qualified after adjustment can be delivered for use.What further illustrate if be worth is that branch's spacing of check-out console 8 in the present embodiment is less than 10cm, then need not consider that pipe crimping 1 bends the excessive situation of action H1, if actual measurement pipe crimping 1 to bend action H1 too small, also should exceed standard a little and between former hot spot, increase hot spot and carry out post bake process at this.

Adopt the technical scheme of the present embodiment, make do not using the simmering and bending engineering completed under large-scale apparatus and high-precision prerequisite heavy steel member, save construction cost and engineering delivery-check qualified rate 100%, simmering and bending size passed examination rate reaches 80%, class of construction quality reaches excellent rank, and this technological project saves R&D fund 7.30 ten thousand yuan, create Project Economy Benefit 29.57 ten thousand yuan.

Schematically above be described the present invention and embodiment thereof, this description does not have restricted, and also just one of the embodiments of the present invention shown in accompanying drawing, actual structure is not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from the invention aim, designing the frame mode similar to this technical scheme and embodiment without creationary, all should protection scope of the present invention be belonged to.

Claims (3)

1. the method for a flame simmering and bending large-diameter pipeline, the method first by algorithm H=a × (Sin α+Sin (2 α)+Sin (3 α)+... + Sin (n-1) α)+b × Sin (n α) carries out segmentation line to pipe crimping (1), re-use gas welding bake to line after pipe crimping (1) heat, because steel expand with heat and contract with cold and the effect of gravity, cooled pipe crimping (1) produces a certain amount of deformation, and after whether the detection of check-out console (8) on pipe crimping (1) bracing or strutting arrangement is qualified, determine whether pay again, after-treatment is carried out to underproof pipe crimping (1),
Specifically comprise following several step:
Step one, preparation of construction
The preparation of construction of step one comprises pipe crimping (1) course of receiving and pipe crimping (1) fragmentation procedure, described pipe crimping (1) course of receiving carries out quality testing to untreated pipe crimping (1), i.e. carrying out flaw detection pipe crimping (1) weld seam, described pipe crimping (1) fragmentation procedure is performed by following algorithm: H=a × (Sin α+Sin (2 α)+Sin (3 α)+... + Sin (n-1) α)+b × Sin (n α), in algorithm, α is pipe crimping (1) the rear angle of bend of heating at every turn, a is the heating spacing of pipe crimping (1), n is that the equidistant heating of pipe crimping (1) side is counted, b is the tip length that pipe crimping (1) does not heat, H is the bending action of pipe crimping (1) after simmering and bending, L is the length of pipe crimping (1), wherein: α, b, L and H is known quantity, and have a=(L-2b)/(2n-1), the parameter of the steel beam column needed for engineering determines the value of the bending action H Σ of total pipe crimping (1), namely the value of the bending action H of every root pipe crimping (1) is drawn, then determine that the heating spacing a of every root pipe crimping (1) and equidistant heating are counted n according to algorithm,
Step 2, pipe crimping are rule
Pipe crimping (1) line is carried out after step one completes preparation of construction, this pipe crimping (1) line comprises support process and scratching process, described support process is: lain in a horizontal plane in by pipe crimping (1) on pipe crimping (1) bracing or strutting arrangement, wherein: described pipe crimping (1) bracing or strutting arrangement comprises the first bearing (61), second bearing (62), hold round rod member (7), check-out console (8) and check-out console support (9), above-mentioned the first bearing (61) and the second bearing (62) lay respectively at below pipe crimping (1) two ends, and the first bearing (61) is concave surface with the contact surface of pipe crimping (1) and the contact surface of the second bearing (62) and pipe crimping (1), this concave recess degree matches with the surperficial circular arc degree of pipe crimping (1), the above-mentioned rod member (7) that holds round snaps in pipe crimping (1) two ends, and hold round rod member (7) length and pipe crimping (1) equal diameters, prevent pipe crimping (1) two ends from when heating, deformation occurring, above-mentioned check-out console support (9) is arranged between the first bearing (61) and the second bearing (62), and check-out console support (9) one end is connected mutually with the first bearing (61), the other end is connected mutually with the second bearing (62), this check-out console support (9) is equidistantly provided with multiple Card trough, above-mentioned check-out console (8) quantity is multiple and has plurality of specifications, check-out console (8) bottom matches with Card trough, the height of this check-out console (8) and directly over it after pipe crimping (1) simmering and bending falling head match, directly over above-mentioned check-out console (8), after pipe crimping (1) simmering and bending, falling head is drawn by the algorithm in step one, described scratching process be the heating determined according to algorithm in step one count n and heating spacing a mark heating region (2), this heating region (2) is two isosceles triangles sharing a base, this isosceles triangle is to heat reference line (5) for upper base, and the summit of above-mentioned isosceles triangle is 30 ° ~ 45 °, below pipe crimping (1) cross-sectional horizontal center line both sides places,
Step 3, flame simmering and bending
Flame simmering and bending can be carried out to pipe crimping (1) after pipe crimping (1) line of completing steps two, the process of flame simmering and bending is as follows: gas welding is roasting simmering and bending the mid point from heating reference line (5), every root pipe crimping (1) adopts the gas welding of 4 same sizes roasting heating simultaneously, roasting of every two gas weldings are one group, two groups all synchronous successively from mid point heats to pipe crimping two ends, two gas weldings often organized are baked the symmetrical Synchronous Heating in base all along above-mentioned isosceles triangle, from the base of isosceles triangle, back and forth run to the summit of isosceles triangle by the base of "the" shape heating profiles from isosceles triangle, after roasting of gas welding moves to summit, two groups of gas weldings are baked and the heating region do not heated other according to above-mentioned steps again (2) are heated to pipe crimping two ends successively, until all heating regions (2) marked all pass through heating, the flame size of handle is baked in 4 above-mentioned gas weldings, firing rate, heated perimeter are consistent, during heating, temperature controls between 600 DEG C ~ 800 DEG C, the control of temperature range is embodied in: by visually observing, during heating, pipe crimping (1) heating place surface occurs that cherry red shows that temperature reaches 600 DEG C, continue heating, show that temperature reaches 800 DEG C when pipe crimping (1) heating place surface changes to orange colour, now should stop heating, move down, continue heating other heating regions (2) part by "the" shape heating profiles,
Step 4, cooling check
After flame simmering and bending step terminates, placement cooling processing is carried out to heated pipe crimping (1), until after room temperature, deformation quantity before heating between pipe crimping center line (3) with pipe crimping center line (4) after cooling is equal with the deformation quantity at upper and lower two edges of pipe crimping (1) respectively, again the bending action H1 of its pipe crimping (1) is checked, inspection step is as follows: detect the distance of pipe crimping (1) lower bottom part after simmering and bending and above-mentioned check-out console (8) upper end whether in 3mm, it is qualified that distance is within the scope of 3mm;
Step 5, after-treatment
After having checked, qualified pipe crimping (1) can be delivered for use, following after-treatment is done to underproof pipe crimping (1): when the deviation when between the bending action H1 of actual pipe crimping (1) and the bending action H of theoretical pipe crimping (1) is larger, adopt gas welding roasting carrying out adjustment, the preferred location of adjustment is selected in deviate maximum point place, hot spot quantity and spacing are determined according to deviate size, its process is: if when the bending action H1 of actual measurement pipe crimping (1) is too small, then exceeds standard a little at this and increase hot spot between former hot spot; If when the bending action H1 of actual measurement pipe crimping (1) is excessive, exceed standard a little establish hot spot at this, the flame simmering and bending of above-mentioned steps three are repeated after selected hot spot, until the deviation of the value H1 of the bending action of actual pipe crimping (1) and the bending action H of theoretical pipe crimping (1) is in 3mm, avoided roasting situation to occur in calibration procedures, pipe crimping (1) qualified after adjustment can be delivered for use.
2. the method for a kind of flame simmering and bending large-diameter pipeline according to claim 1, it is characterized in that: the quantity of described check-out console (8) is at least 8, and the height of check-out console (8) increases progressively from centre to both sides, the upper extreme point connecting line of each check-out console (8) is reclinate camber line.
3. the method for a kind of flame simmering and bending large-diameter pipeline according to claim 2, is characterized in that: pipe crimping (1) tip length b is 500 ~ 800mm.
CN201410367605.4A 2014-07-29 2014-07-29 A kind of method of flame simmering and bending large-diameter pipeline CN104138941B (en)

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