CN104138941A - Method for bending large-diameter pipelines through fire - Google Patents

Method for bending large-diameter pipelines through fire Download PDF

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Publication number
CN104138941A
CN104138941A CN201410367605.4A CN201410367605A CN104138941A CN 104138941 A CN104138941 A CN 104138941A CN 201410367605 A CN201410367605 A CN 201410367605A CN 104138941 A CN104138941 A CN 104138941A
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China
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pipe crimping
bending
heating
check
console
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CN201410367605.4A
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Chinese (zh)
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CN104138941B (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 method for bending large-diameter pipelines through fire and belongs to the technical field of pipeline machining. The method comprises the step of construction preparation, wherein quality detection and algorithm quantification are carried out on reel pipes; the step of reel pipe marking, wherein the reel pipes are supported by a reel pipe supporting device, and heating areas are marked on the reel pipes; the step of fire bending, the heating areas marked well are bent along the zigzag path, and the time duration for bending is decided according to colors generated when the reel pipes are heated; the step of cooling detection, wherein after the reel pipes are cooled, whether the distance between the lower bottoms of the bent reel pipes and the upper end of a detection board is within 3 mm or not is detected, and the reel pipes are qualified if the distance is within 3 mm; the step of secondary processing, wherein when deviation between the actual reel pipe bending chord height H1 and the theoretical reel pipe bending chord height H is large, adjustment is carried out through a gas welding baking handle. The method solves the problem that a large instrument is needed when the large-diameter pipelines are bent through fire, bending is carried out by utilization of gravity of the pipelines and characteristics of the pipelines, requirements for sites and instruments are not high, and the method is applicable to various construction environments.

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: the one, and structural mechanics effect, the 2nd, the direction of change pipeline, the external environments such as bend pipe can buffering pipe on-site stratum migration, earthquake and variations in temperature are attached to pulling force, pressure and the torsional interaction power on straight tube, so the performance of bend pipe directly affects reliability, security and the economy of construction quality and pipeline transportation, therefore the process technology of bend pipe just seems especially important.And that the making of bend pipe also has is a variety of, according to the difference of bend pipe processing mode, can be divided into cold bending and hot-bending bends, cold bending is radian or the angle that direct application of force bending reaches designing requirement to production tube; And hot-bending bends is to adopt suitable method to heat steel pipe, then carry out flexural deformation, reach radian or the angle of designing requirement, because hot procedure can effectively reduce the impact of flexural deformation on steel tube performance, thereby hot-bending bends is more suitable for, in the manufacture of larger radian or angle bend pipe, having wide range of applications.And large-diameter pipeline bending is generally heated afterwards, is adopted mechanical compression to reach by entirety in factory, need special large-scale heater and large pressing machine tool, but at engineering site, the bending of large-diameter pipeline is taked to this kind of method, equipment investment is large, and operating expenses is high.

In domestic construction engineering, generally all adopt fire-heating elbow process program, such as Putuo District, Zhoushan Lu Jia temple bridge etc., but there are many defects in flame pipe bending technique, main manifestations is that firing rate is slow, heat inhomogeneous, consumption gas cost is large, work situation is poor, particularly easily affect the performance of steel pipe mother metal, also there is recently the technology of hot elbowing by inductive heating, 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 be in plant produced, can not carry out field heat bending, there is the extremely inconvenient problem of long-distance transport, and freight is larger.

By patent retrieval, technical scheme about " heating simmering and bending pipeline " is existing open, for example: China Patent No. ZL201110160336.0, Granted publication day 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) select to be applicable to carry out the spiral seam submerged-arc welding pipe that eddy-current heating bends and manage as mother; (2) described spiral seam submerged-arc welding pipe is carried out to the processing of bend pipe bending technique; (3) spiral seam submerged-arc welding pipe through described bending technique processing is heat-treated; (4) will carry out the processing of bend pipe pipe end through heat treated spiral seam submerged-arc welding pipe.This technical scheme has solved the technical problem of pipeline simmering and bending to a certain extent, reach pipeline simmering and bending effect, but also have a lot of drawbacks: step (2) bend pipe of technique scheme bends to process and refers to the thermal treatment zone of pipeline being put into solid shape, heat while advance, although reached pipeline simmering and bending object, but the needs that are fixedly difficult to meet multiple simmering and bending camber in simmering and bending region, and this hot bending method requires too high to apparatus, in a lot of remote construction areas, apparatus is difficult to be protected, larger with the difficulty of the method construction; And the step of technique scheme is carried out Quenching Treatment to pipeline in (3), pipeline carries out easily embrittlement and distortion after Quenching Treatment, and simmering and bending precision can not get ensureing, so also need further to improve perfect.

And for example: China Patent No. ZL201010588241.4, Granted publication day 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, adopt the special moulding bed that bends, two ends fulcrum support steel pipe, adopt two Frequency Induction Heating system equipments to carry out symmetry heating to steel pipe, exert pressure to steel pipe with hydraulic jack mechanism in centre, the pressurized tube wall steel contraction distortion of being heated of steel pipe inner arc, forms the stretched wire line style arch of designing requirement by technological means.The method has been protected again the performance of steel pipe mother metal in reaching simmering and bending object, but the method has been used the apparatuses such as two cover Frequency Induction Heating systems, hydraulic jack, infrared thermography instrument, requires too high to apparatus; And heating-up temperature is between 800 DEG C~900 DEG C, and the pipeline mouth of pipe also heats, and deformation has occurred, this has just come difficulty and construction hidden danger to Pipeline butt tape splicing afterwards; 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 pipeline radian, neither attractive in appearancely also makes troubles to construction, also needs further to improve perfect.

Summary of the invention

1. the technical problem that invention will solve

The object of the invention is to overcome the deficiency that relies on large-scale, accurate apparatus and simmering and bending precision in the prior art about " pipeline simmering and bending ", a kind of method of flame simmering and bending large-diameter pipeline is provided, adopt technical scheme of the present invention, can under the circumstances that there is no large-scale, accurate apparatus, carry out high-precision simmering and bending 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 roasting the pipe crimping (1) after line is heated, 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 again whether pay, underproof pipe crimping (1) is carried out to after-treatment.

As further improvement of the present invention, the method for a kind of flame simmering and bending large-diameter pipeline of the present invention comprises following several step:

Step 1, preparation of construction

The preparation of construction of step 1 comprises the pipe crimping course of receiving and pipe crimping fragmentation procedure, and the described pipe crimping course of receiving is that untreated pipe crimping is carried out to quality testing, i.e. carrying out flaw detection pipe crimping weld seam, described pipe crimping fragmentation procedure is carried out 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 angle of bend after the each heating of pipe crimping, a is the heating spacing of pipe crimping, n is that the equidistant heating of pipe crimping one side is counted, b is the tip length that pipe crimping does not heat, H is the bending action of pipe crimping after simmering and bending, L is the length of pipe crimping, wherein: α, b, L and H are known quantity, and there is a=(L-2b)/(2n-1), determine the value of the bending action H of total pipe crimping Σ according to the parameter of the required steel member of engineering, draw the value of the bending action H of every pipe crimping, then determine the heating spacing a of every pipe crimping and the equidistant heating n that counts according to algorithm,

Step 2, pipe crimping line

After completing preparation of construction, step 1 carries out pipe crimping line, this pipe crimping line comprises support process and scratching process, described support process is: pipe crimping is lain in a horizontal plane on pipe crimping bracing or strutting arrangement, wherein: described pipe crimping bracing or strutting arrangement comprises the first bearing, the 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-making surface of the contact-making 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 hold round rod member length and pipe crimping equal diameters, prevent that pipe crimping two ends from deformation occurring in the time of heating, above-mentioned check-out console support is arranged 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 equal intervals is provided with multiple Card troughs, above-mentioned check-out console quantity is multiple and has plurality of specifications, check-out console bottom matches with Card trough, 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 1, described scratching process is to mark heating region according to count n and heating spacing a of the definite heating of algorithm in step 1, this heating region is two isosceles triangles that share a base, this isosceles triangle is taking heating reference line as upper base, and the summit of above-mentioned isosceles triangle is that following 30 °~45 ° of pipe crimping cross section horizontal center line both sides are located,

Step 3, flame simmering and bending

After the pipe crimping line of completing steps two, can carry out flame simmering and bending to pipe crimping, the process of flame simmering and bending is as follows: gas welding is roasting starting simmering and bending from the mid point of heating reference line, every pipe crimping adopts the gas welding of 4 same sizes to bake heating simultaneously, roasting of every two gas weldings are one group, two groups all start synchronously to heat to pipe crimping two ends successively from mid point, two gas weldings of every group are roasting equal base symmetry Synchronous Heatings along above-mentioned isosceles triangle, from the base of isosceles triangle, back and forth move to the summit of isosceles triangle from the base of isosceles triangle by "the" shape heating route, roasting moving to behind summit in gas welding, two groups of gas weldings are baked the heating region according to above-mentioned steps, other not being heated are again heated to pipe crimping two ends successively, until all heating regions that mark all pass through heat treated, flame size, firing rate, the heated perimeter of the above-mentioned roasting handle of 4 gas weldings are consistent, when heating, temperature is controlled between 600 DEG C~800 DEG C, the control of temperature range is embodied in: by visually observing, when heating, pipe crimping heating place surface occurs that cherry red shows that temperature has reached 600 DEG C, continue heating, when pipe crimping heating place surface shows that in the time that orange colour changes temperature has reached 800 DEG C, now should stop heating, move down, continue other heating region parts of heating by "the" shape heating route,

Step 4, cooling inspection

After flame simmering and bending step finishes, the pipe crimping heating is placed to cooling processing, until after room temperature, the deformation quantity heating between front pipe crimping center line and cooling rear pipe crimping center line equates with the deformation quantity at upper and lower two edges of pipe crimping respectively, again the bending action H1 of its pipe crimping is checked, inspection step is as follows: whether the distance that detects pipe crimping lower bottom part after simmering and bending and above-mentioned check-out console upper end is in 3mm, qualified apart from being within the scope of 3mm;

Step 5, after-treatment

After having checked, qualified pipe crimping can be delivered for use, underproof pipe crimping is done to following after-treatment: in the time that the deviation between the bending action H1 of actual pipe crimping and the bending action H of theoretical pipe crimping 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 determine according to deviate size, and its process is: if the bending action H1 of actual measurement pipe crimping when too small, this exceed standard a little and former hot spot between increase hot spot; If when the bending action H1 of actual measurement pipe crimping is excessive, this exceed standard a little under establish hot spot, after selected hot spot, repeat the flame simmering and bending of above-mentioned steps three, until the deviation of the value H1 of the bending action of actual pipe crimping and the bending action H of theoretical pipe crimping is in 3mm, in adjustment process, avoided roasting situation to occur, 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 to both sides from centre, 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 applying external force and large-scale, accurate apparatus can reach the object of pipeline being carried out to simmering and bending, simplify operational procedure, save construction cost.

(2) method of a kind of flame simmering and bending large-diameter pipeline of the present invention, pipe crimping fragmentation procedure is carried out by following algorithm: H=a × (Sin α+Sin (2 α)+Sin (3 α)+... + Sin (n-1) α)+b × Sin (n α), draw accurately the size and number of heating region according to this algorithm, and pipe crimping bracing or strutting arrangement provides instrument basis for simmering plumber's order, by the acting in conjunction of simmering and bending heating region and pipe crimping bracing or strutting arrangement, make the error of the bending action H1 of actual pipe crimping and the bending action H of theoretical pipe crimping be 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 is made.

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

Brief description of the drawings

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, cooling rear pipe crimping center line; 5, heating reference line; 61, the first bearing; 62, the second bearing; 7, hold round rod member; 8, check-out console; 9, check-out console support.

Detailed description of the invention

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

Embodiment 1

Be divided into two kinds for the method for heavy steel member bend pipe: 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 push afterwards after bend pipe, the local simmering and bending extrusion modling of elder generation integral solder bend pipe etc.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, for example: intermediate frequency hot bending machine, hydraulic jack, infrared thermography instrument etc.It is worth noting: the region of much constructing 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 member.

Applicant is on the basis of summing up heavy steel member construction experience in the past, off the beaten track, after having taked to simmer pipe, utilize pipeline self gravitation to reach the object of bend pipe, whole construction method all adopts small appliance and these small appliances to be convenient to transport, to make simply, has greatly improved the feasibility of remote region construction and has saved again 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 1, preparation of construction

The preparation of construction of step 1 comprises pipe crimping 1 course of receiving and pipe crimping 1 fragmentation procedure, and described pipe crimping 1 course of receiving is that untreated pipe crimping 1 is carried out to quality testing, i.e. carrying out flaw detection pipe crimping 1 weld seam, described pipe crimping 1 fragmentation procedure is carried out 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 angle of bend after the each heating of pipe crimping 1, a is the heating spacing of pipe crimping 1, n is that the equidistant heating of pipe crimping 1 one sides is counted, b is the tip length that pipe crimping 1 does not heat, length is 500~800mm (being specifically 650mm at the present embodiment), 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 are known quantity, and there is a=L-2b/2n-1, determine the bending action H of total pipe crimping according to the parameter of the required steel member of engineering Σvalue, draw the value of the bending action H of every pipe crimping, then determine the heating spacing a of every pipe crimping 1 and the equidistant heating n that counts according to algorithm,

Pipe crimping 1 course of receiving in the present embodiment comprises that specification and quality to pipe crimping 1 test, and pipe crimping 1 all has weld seam, and butt welded seam place will strengthen auditing standards, gets rid of because of the former of tubing self thereby causes the making of heavy steel member not reach the factor of preassigned; 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 softwares, not only convenient but also quick, such as Microsoft Excel software etc.

Step 2, pipe crimping line

After step 1 completes preparation of construction, carrying out pipe crimping 1 rules, this pipe crimping 1 line comprises support process and scratching process, described support process is: pipe crimping 1 is lain in a horizontal plane on pipe crimping 1 bracing or strutting arrangement, wherein: described pipe crimping 1 bracing or strutting arrangement comprises the first bearing 61, the 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 pipe crimping 1 below, two ends, and the first bearing 61 is as concave surface with the contact-making surface of pipe crimping 1 with contact-making surface and second bearing 62 of 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 that 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 are connected mutually with the first bearing 61, the other end is connected mutually with the second bearing 62, these check-out console support 9 equal intervals are provided with multiple Card troughs, above-mentioned check-out console 8 quantity are multiple and have plurality of specifications, check-out console 8 bottoms and Card trough match, 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 1 and the quantity of check-out console 8 is at least 8, the height of check-out console 8 increases progressively to both sides from centre, the upper extreme point connecting line of each check-out console 8 is reclinate camber line, described scratching process is to mark heating region 2 (as shown in Figure 4) according to count n and heating spacing a of the definite heating of algorithm in step 1, this heating region 2 is for sharing two isosceles triangles on a base, this isosceles triangle is taking heating reference line 5 as upper base, and the summit of above-mentioned isosceles triangle is that pipe crimping 1 cross section horizontal center line both sides following 30 °~45 ° (specifically selecting in the present embodiment 40 °) are located.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, can be convenient to measure pipe crimping 1 simmering and bending after deformation quantity whether reach preassigned; The setting that holds round rod member 7 has prevented that pipe crimping 1 two ends from deformation occurring, and has discharged the assembled hidden danger of step 6.

Step 3, flame simmering and bending

After the pipe crimping line of completing steps two, can carry out flame simmering and bending to pipe crimping 1, the process of flame simmering and bending is as follows: gas welding is roasting starting simmering and bending from the mid point of heating reference line 5, every pipe crimping 1 adopts the gas welding of 4 same sizes to bake heating simultaneously, two gas weldings are in opposite directions roasting being one group, and two groups all start synchronously to heat to pipe crimping two ends successively from mid point.Two gas weldings of every group are roasting equal base symmetry Synchronous Heatings along above-mentioned isosceles triangle, from the base of isosceles triangle, back and forth move to the summit of isosceles triangle from the base of isosceles triangle by "the" shape heating route, roasting moving to behind summit in gas welding, two groups of gas weldings are baked the heating region 2 along above-mentioned steps, other not being heated are again heated successively, until all heating regions 2 that mark all pass through heat treated (as shown in Figure 4); Flame size, firing rate, the heated perimeter of the above-mentioned roasting handle of 4 gas weldings are consistent, when heating, temperature is controlled between 600 DEG C~800 DEG C, the control of temperature range is embodied in: by visually observing, when heating, pipe crimping 1 heating place surface occurs that cherry red shows that temperature has reached 600 DEG C, continue heating, when pipe crimping 1 heating place surface shows that in the time that orange colour changes temperature has reached 800 DEG C, now should stop heating, move down, continue other heating region 2 parts of heating by "the" shape heating route; It is roasting heating simultaneously that in the present embodiment, every pipe crimping 1 adopts the gas welding of 4 same sizes, not only ensured efficiency of construction but also avoided with the area abnormal phenomenon that pipe crimping occurs in the situation that having the heating time difference; When heating, temperature is controlled at following reason between 600 DEG C~800 DEG C: one, pipe crimping 1 needed deformation quantity of algorithm in 600 DEG C~800 DEG C just can reach cooling rear generation step 1; Two, in the time of 600 DEG C and 800 DEG C of these two temperature, the change color of pipe crimping 1 is comparatively obvious, is convenient to naked eyes judgement, more easily operation when heating.

Step 4, cooling inspection

After flame simmering and bending step finishes, the pipe crimping 1 heating is placed to cooling processing, until after room temperature, the deformation quantity heating between front pipe crimping center line 3 and cooling rear pipe crimping center line 4 equates 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: whether the distance that detects pipe crimping 1 lower bottom part after simmering and bending and above-mentioned check-out console 8 upper ends is in 3mm, qualified apart from being within the scope of 3mm;

Step 5, after-treatment

After having checked, qualified pipe crimping 1 can be delivered for use, underproof pipe crimping 1 is done to following after-treatment: in the time that the deviation 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 determine according to deviate size, and its process is: if the bending action H1 of actual measurement pipe crimping 1 when too small, this exceed standard a little and former hot spot between increase hot spot; If when the bending action H1 of actual measurement pipe crimping 1 is excessive, this exceed standard a little under establish hot spot, after selected hot spot, repeat the flame simmering and bending of above-mentioned steps three, until the deviation of the value H1 of actual pipe crimping 1 bending action and the bending action H of theoretical pipe crimping 1 is in 3mm, in adjustment process, avoided roasting situation to occur, 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, needn't consider the excessive situation of the bending action H1 of pipe crimping 1, if actual measurement pipe crimping 1 bending action H1 is too small, also should this exceed standard a little and former hot spot between increase hot spot and carry out post bake processing.

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

Below schematically the present invention and embodiment thereof are described, this description does not have restricted, and shown in accompanying drawing is also one of embodiments of the present invention, and actual structure is not limited to this.So, if those of ordinary skill in the art is enlightened by it, in the situation that not departing from the invention aim, without the creationary frame mode similar to this technical scheme and the embodiment of designing, all should belong to protection scope of the present invention.

Claims (4)

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 roasting the pipe crimping (1) after line is heated, 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 again whether pay, underproof pipe crimping (1) is carried out to after-treatment.
2. the method for a kind of flame simmering and bending large-diameter pipeline according to claim 1, is characterized in that, comprises following several step:
Step 1, preparation of construction
The preparation of construction of step 1 comprises pipe crimping (1) course of receiving and pipe crimping (1) fragmentation procedure, described pipe crimping (1) course of receiving is that untreated pipe crimping (1) is carried out to quality testing, i.e. carrying out flaw detection pipe crimping (1) weld seam, described pipe crimping (1) fragmentation procedure is carried out 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 angle of bend after the each heating of pipe crimping (1), a is the heating spacing of pipe crimping (1), n is that the equidistant heating of pipe crimping (1) one 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 are known quantity, and there is a=(L-2b)/(2n-1), determine the value of the bending action H of total pipe crimping (1) Σ according to the parameter of the required steel member of engineering, draw the value of the bending action H of every pipe crimping (1), then determine the heating spacing a of every pipe crimping (1) and the equidistant heating n that counts according to algorithm,
Step 2, pipe crimping line
After completing preparation of construction, step 1 carries out pipe crimping (1) line, this pipe crimping (1) line comprises support process and scratching process, described support process is: pipe crimping (1) is lain in a horizontal plane on pipe crimping (1) bracing or strutting arrangement, wherein: described pipe crimping (1) bracing or strutting arrangement comprises the first bearing (61), the 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 contact-making surface and second bearing (62) of pipe crimping (1) with the contact-making surface of 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 that pipe crimping (1) two ends from deformation occurring in the time of heating, 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) equal intervals is provided with multiple Card troughs, 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 1, described scratching process is to mark heating region (2) according to count n and heating spacing a of the definite heating of algorithm in step 1, this heating region (2) is for sharing two isosceles triangles on a base, this isosceles triangle is taking heating reference line (5) as upper base, and the summit of above-mentioned isosceles triangle is that following 30 °~45 ° of pipe crimping (1) cross section horizontal center line both sides are located,
Step 3, flame simmering and bending
After pipe crimping (1) line of completing steps two, can carry out flame simmering and bending to pipe crimping (1), the process of flame simmering and bending is as follows: gas welding is roasting starting simmering and bending from the mid point of heating reference line (5), every 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 start synchronously to heat to pipe crimping two ends successively from mid point, two gas weldings of every group are roasting equal base symmetry Synchronous Heatings along above-mentioned isosceles triangle, from the base of isosceles triangle, back and forth move to the summit of isosceles triangle from the base of isosceles triangle by "the" shape heating route, roasting moving to behind summit in gas welding, two groups of gas weldings are baked the heating region according to above-mentioned steps, other not being heated again (2) are heated to pipe crimping two ends successively, until all heating regions (2) that mark all pass through heat treated, flame size, firing rate, the heated perimeter of the above-mentioned roasting handle of 4 gas weldings are consistent, when heating, temperature is controlled between 600 DEG C~800 DEG C, the control of temperature range is embodied in: by visually observing, pipe crimping when heating (1) heating place surface occurs that cherry red shows that temperature has reached 600 DEG C, continue heating, when pipe crimping (1) heating place surface shows that in the time that orange colour changes temperature has reached 800 DEG C, now should stop heating, move down, continue heating other heating regions (2) part by "the" shape heating route,
Step 4, cooling inspection
After flame simmering and bending step finishes, the pipe crimping heating (1) is placed to cooling processing, until after room temperature, the deformation quantity heating between front pipe crimping center line (3) and cooling rear pipe crimping center line (4) equates 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: whether the distance that detects pipe crimping (1) lower bottom part after simmering and bending and above-mentioned check-out console (8) upper end is in 3mm, qualified apart from being within the scope of 3mm;
Step 5, after-treatment
After having checked, qualified pipe crimping (1) can be delivered for use, underproof pipe crimping (1) is done to following after-treatment: in the time that the deviation 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 actual measurement pipe crimping (1) bending action H1 when too small, this exceed standard a little and former hot spot between increase hot spot; If when the bending action H1 of actual measurement pipe crimping (1) is excessive, this exceed standard a little under establish hot spot, after selected hot spot, repeat the flame simmering and bending of above-mentioned steps three, 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, in adjustment process, avoided roasting situation to occur, pipe crimping (1) qualified after adjustment can be delivered for use.
3. 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 to both sides from centre, the upper extreme point connecting line of each check-out console (8) is reclinate camber line.
4. according to the method for a kind of flame simmering and bending large-diameter pipeline described in claim 2 or 3, it 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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