CN107116361A - The pressure testing of Steam Turbine jet chimney entirety, overall Stressless Pipeline Connection construction method - Google Patents
The pressure testing of Steam Turbine jet chimney entirety, overall Stressless Pipeline Connection construction method Download PDFInfo
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- CN107116361A CN107116361A CN201710277182.0A CN201710277182A CN107116361A CN 107116361 A CN107116361 A CN 107116361A CN 201710277182 A CN201710277182 A CN 201710277182A CN 107116361 A CN107116361 A CN 107116361A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P21/00—Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control
- B23P21/002—Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control the units stationary whilst being composed
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Abstract
A kind of overall pressure testing of Steam Turbine jet chimney, overall Stressless Pipeline Connection construction method, including step：Raw material, equipment and the inspection of tools are qualified；Making has through hole on first, second falsework, each falsework, each through hole perisporium has jackscrew；Lifting device is made, it includes bottom plate and hanger, and the two ends of bottom plate there are two bolts hole；Pipe flange is docked with equipment mouthful flange, parallel misalignment≤0.25mm, Concentricity tolerance≤0.5mm；Standpipe is sequentially passed through pipe flange bottom is promoted to after through hole；Pass through unfitness of butt joint and clearance fine adjustment of the jackscrew to 108# and 104# mouthfuls of generations of standpipe, subsequent spot welding；108# mouthfuls are welded using double welders symmetrical equidirectional welding manner, 104# mouthfuls are finally welded；By PRESSURE TESTING BLIND FLANGE on pipe flange top surface；Pressure testing is carried out to whole pipe-line system；Pipeline is resetted, and pipe flange is docked with steam turbine equipment mouthful flange.It is of the invention thoroughly to change reserved gold mouthful method, construction speed and quality are greatly improved, expense is saved.
Description
Technical field
It is especially a kind of large-scale the present invention relates to the mounting technique field of Large Air Separation Devices Steam Turbine high steam pipeline
The overall pressure testing of space division Steam Turbine high steam pipeline, overall Stressless Pipeline Connection construction method.
Background technology
Space division refers to the separation to air, for example can according to liquid nitrogen separation of nitrogen different with the boiling point of liquid oxygen and oxygen,
Separated including UF membrane, two-tower rectification etc., big small-sized or middle-size and small-size space division can take different principles.And steam turbine is a kind of
By the heat energy of steam be converted into apparatus can turbine type machinery, heat energy is converted against the nozzle of steam turbine
Into kinetic energy, kinetic energy is set to become mechanical energy by changing airflow direction again afterwards.
High temperature, high steam promote steam turbine to rotate, so as to drive compressor and supercharger to work.Wherein, high pressure is steamed
The installation in steam pipe road is the emphasis of the air separation unit, difficult point, and can its quality installed will directly affect steam turbine normal work.
If installation is unqualified, the stress of jet chimney will be sent to steam turbine, the steam turbine installed is produced displacement
Even deform, when serious, steam turbine equipment mouthful flange is poorly sealed with pipe flange, causes steam to leak.Therefore, in tube method
When orchid is docked with steam turbine equipment mouthful flange, any external force is not allowed to be applied on steam turbine.At present, existing Large Air Separation Devices steamer
The high steam pipeline of unit solves this problem, i.e., by reserved using the method for reserved gold weld bond mostly in construction
The mode of gold weld bond is used as last Stressless Pipeline Connection regulation surplus, and still, high steam pipeline is all typically mounted to perseverance
On power spring support hanging frame, and just there are 6 sets close to the spring support hanging frame that Steam Turbine is responsible for, due to constant-force spring hanger inconvenience
In adjustment, so as to bring sizable difficulty to pipe arrangement and pressure testing, cause efficiency of construction very low, cost rise.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of overall pressure testing of Steam Turbine jet chimney, entirety is unstressed
Pipe arrangement construction method, that it changes the method for the reserved gold mouthful of tradition, greatly improves construction speed and construction quality, while also saving
About substantial amounts of operating expenses.
The technical solution of the present invention is to provide a kind of overall pressure testing of Steam Turbine jet chimney, overall unstressed matched somebody with somebody
Pipe construction method, comprises the following steps：
(1) preparation of construction
All raw material, electric welding machine during construction, heat treatment equipment, hoisting rig must be examined qualified, data of applying for checking and examination
It is complete, check whether site road, place, power supply for construction, the scaffold job platform set up meet construction requirement, standpipe blanking
Before, the levelness of each pipeline is adjusted, scene is checked size, accomplishes accurate, standpipe cutting length should deduct vapour
It should check whether bevel angle is qualified before spacer thickness between turbine equipment mouthful flange and pipe flange, pipe string, groove
It is whether colored qualified；
(2) making and installation of falsework
The first falsework and the second falsework are made, each falsework includes the through hole passed through for standpipe, respectively
Some jackscrews are respectively arranged with the perisporium of through hole, the first falsework and the second falsework are under steam turbine equipment mouthful flange
In the concrete foundation of side, the first falsework faces away from steam turbine equipment mouthful 0.8~1.2m of flange, the second falsework away from first
When support 1.8~2.2m；
(3) hoisting tool special is made
Hoisting tool special includes elongated bottom plate and two pairs of hangers, and the two ends of elongated bottom plate open up two and pipe flange
On the bolt hole that matches of through hole, the one pair of which hanger in two pairs of hangers is located on the left of elongated bottom plate, and installed in elongated bottom
At 1/3 position of plate length, another pair hanger is arranged on elongated bottom plate right-hand member；
(4) pipe laying flange
Pipe flange is mounted on two bolts hole on the left of elongated bottom plate by bolt, one is lifted in elongated bottom plate right-hand member
Individual weight and pipe flange identical object, the large and small gib head of driving is hooked on two pairs of hangers respectively and lifted by crane simultaneously, will be managed
Road flange is sent in the gap below steam turbine equipment mouthful flange, is completed using 4 sets of bolts and the thick temporary shims of 4mm
The installation of pipe flange and steam turbine equipment mouthful flange, measures the depth of parallelism of the pipe flange and steam turbine equipment mouthful flange and same
Heart degree, parallel misalignment≤0.25mm, Concentricity tolerance≤0.5mm；
(5) lifting of standpipe
105# and 106# mouthfuls of welding of standpipe bottom are completed on the ground, and ensure the perpendicularity of the standpipe and anti-welding
The control requirement of deformation, timely butt welding mouth is heat-treated and Non-Destructive Testing, complies with requirement, treats 105# and 106# mouthfuls of welding
After qualified, the suspension centre of chain block is arranged on falsework, and sequentially passed through standpipe on two falseworks using it
Through hole after be promoted to pipe flange bottom；
(6) fixation and spot welding of standpipe
Check standpipe two ends 108# and 104# mouthfuls install the misalignment between jet chimney with pipe flange and in advance respectively
Amount and gap, by the jackscrew on two falseworks to 108# and 104# mouthfuls of the standpipe two ends unfitnesses of butt joint produced in group pair
It is finely adjusted with gap, meets after welding procedure guiding book, fixed standpipe using jackscrew, then 108# and 104# mouthfuls is carried out
Spot welding, can not by force be organized pair during spot welding by external force；
(7) standpipe is welded
Pipe flange is removed with 4 sets of bolts that steam turbine equipment mouthful flange is connected, it is symmetrical using double welders first
Equidirectional welding manner is welded to the 108# mouths of riser upper, and being often soldered together will be to the depth of parallelism of pipe flange and same
Heart degree is checked, it is ensured that it is in prescribed limit, and welding is completed, and weld seam is heat-treated in time after after weld bond cooling, heat
Nondestructive inspection is carried out after processing is qualified, 104# mouthfuls are finally welded, it is ensured that the depth of parallelism and concentricity of pipe flange are all in regulation model
In enclosing；
(8) installation of PRESSURE TESTING BLIND FLANGE
After the heat treatment of all weld seams, Non-Destructive Testing are qualified, three constant force bullets close to steam turbine equipment mouthful flange are removed
Spring bearing hanger, pipe flange top surface declines 300~350mm, the space for installing PRESSURE TESTING BLIND FLANGE is reserved, in three constant force bullets of dismounting
A temporary support is respectively supported at spring bearing hanger, is lifted PRESSURE TESTING BLIND FLANGE to pipeline by the hoisting tool special of step (3)
Installed on flange top surface；
(9) pressure testing is carried out to whole pipe-line system；
(10) pipeline resets
After pressure testing is qualified, three temporary supports in step (7) are removed, three constant-force spring hangers of dismounting are answered
The depth of parallelism, concentricity and the flange face gap of position, adjustment steam turbine equipment mouthful flange and pipe flange, it is qualified after, pass through jackscrew
Standpipe is fixed, and docked pipe flange with steam turbine equipment mouthful flange by bolt.
The overall pressure testing of Steam Turbine jet chimney of the present invention, overall Stressless Pipeline Connection construction method, wherein, welding
Before, using argon arc welding bottoming, from Φ 2.4mm welding wire, argon flow amount is 10~15L/min.
The overall pressure testing of Steam Turbine jet chimney of the present invention, overall Stressless Pipeline Connection construction method, wherein, use
Electric heating carries out weld preheating to welding wire, and preheating temperature is 150~200 DEG C, and welding current during welding is 80~120A,
Weldingvoltage is 12~18V, and speed of welding is 5~6cm/min, and thickness is 2.5~3.0mm.
The overall pressure testing of Steam Turbine jet chimney of the present invention, overall Stressless Pipeline Connection construction method, wherein, pass through
SMAW is filled and capping, using double symmetrical, multi-pass welding.
The overall pressure testing of Steam Turbine jet chimney of the present invention, overall Stressless Pipeline Connection construction method, wherein, use
Electric heating carries out weld preheating to welding rod, and preheating temperature is 200~250 DEG C, and interlayer temperature is controlled at 200~300 DEG C, weldering
Bar amplitude of fluctuation is at less than 4 times of core diameter, and welding current is 95~120A, and speed of welding is 5~7cm/min.
The overall pressure testing of Steam Turbine jet chimney of the present invention, overall Stressless Pipeline Connection construction method, wherein, use
Electric heating controls the heating-up temperature of post weld heat treatment, and temperature control is at 750~770 DEG C.
The overall pressure testing of Steam Turbine jet chimney of the present invention, overall Stressless Pipeline Connection construction method, wherein, in step
When finding deviation in (6) suddenly, this one side diminished to pipe flange gap is welded.
The overall pressure testing of Steam Turbine jet chimney of the present invention, overall Stressless Pipeline Connection construction method, wherein, entirely
Welding, heat treatment process are both needed between the depth of parallelism, concentricity and the flange face of monitoring pipe flange and steam turbine equipment mouthful flange
Gap, it is ensured that it is in prescribed limit.
The overall pressure testing of Steam Turbine jet chimney of the present invention, overall Stressless Pipeline Connection construction method, wherein, temporarily
Support frame is fabricated to " door " font using common I-steel or H profile steel, and preassembled jet chimney is placed on into the interim branch
At the top of support.
After above structure, compared with prior art, the overall pressure testing of Steam Turbine jet chimney of the present invention, overall nothing should
Power pipe arrangement construction method has advantages below：The present invention, will be with steam turbine equipment mouthful flange before whole pipe-line system pressure testing
The standpipe of connection finally installs in place, by installing falsework in standpipe and the side of vertical direction deviation being adjusted using jackscrew
Formula, makes it all reach requirement in the deviation of level, vertical both direction, treats that all constant-force spring hangers are installed in place and adjusted
After qualified, using first spot welding again by the symmetrical equidirectional welding of double welders by the way of pipeline is welded with pipe flange, weldering
Engage after lattice, in the case where whole pipe-line system supervisor does not stress, pipe-line system is supported by temporary support, by tube method
The blue distance that 300~350mm is disengaged with steam turbine equipment mouthful flange so that the free installing/dismounting of temporary stop plate energy, is then carried out
Pressure test, after the completion of pressure testing, recover standpipe simultaneously measure whether its deviation matches with initial data, finally by pipe flange with
Steam turbine equipment mouthful flange is docked, and realizes the overall pressure testing of jet chimney, overall Stressless Pipeline Connection construction technology.Thus it is not difficult
Find out, the method that the present invention revolutionizes traditional reserved gold weld bond so that work efficiency is significantly lifted, and cost is saved
About, it is safer during construction, complete construction task with can guaranteeing the quality.
The quality of welding is may further ensure that using argon arc welding bottoming.
Weld preheating is carried out to welding wire using Electric heating, preheating temperature is 150~200 DEG C, welding electricity during welding
Flow for 80~120A, weldingvoltage is 12~18V, speed of welding is 5~6cm/min, and thickness is 2.5~3.0mm.Its advantage exists
In：The quality of welding can be further ensured that.
Welding deformation can be effectively reduced using double symmetrical, multi-pass welding.
Weld preheating is carried out to welding rod using Electric heating, preheating temperature is 200~250 DEG C, and interlayer temperature control exists
200~300 DEG C, welding rod amplitude of fluctuation is at less than 4 times of core diameter, and welding current is 95~120A, and speed of welding is 5~
7cm/min.Its advantage is：Under conditions of welding procedure is met, the amplitude of fluctuation of welding rod is effectively reduced, and then reaches reduction weldering
Shrinkage stress in termination process and prevent the excessive purpose of deflection.
The heating-up temperature of post weld heat treatment is controlled using Electric heating, and temperature control is at 750~770 DEG C, can
Ensure that heat treatment is disposable in place.
When finding deviation in welding process, this one side diminished to pipe flange gap is welded, and can shrink it
The weld seam of symmetry direction so that pipe flange gap shrinks.
Brief description of the drawings
Fig. 1 is whole pipeline in the overall pressure testing of Steam Turbine jet chimney of the present invention, overall Stressless Pipeline Connection construction method
Structural representation when system is connected with steam turbine；
Fig. 2 is that pipe flange is disengaged with steam turbine equipment mouthful flange, and front view structure signal when being connected with PRESSURE TESTING BLIND FLANGE
Figure；
Fig. 3 is the broken section mplifying structure schematic diagram of edge " A-A " line in Fig. 2；
Fig. 4 is special hoisting in the overall pressure testing of Steam Turbine jet chimney of the present invention, overall Stressless Pipeline Connection construction method
The three-dimensional mplifying structure schematic diagram of instrument.
Embodiment
With reference to the accompanying drawings and detailed description to the overall pressure testing of Steam Turbine jet chimney of the present invention, overall unstressed
Pipe arrangement construction method is described in further detail：
In this embodiment, the overall pressure testing of Steam Turbine jet chimney of the present invention, overall Stressless Pipeline Connection construction
Method, comprises the following steps：
(1) preparation of construction
All raw material, electric welding machine during construction, heat treatment equipment, hoisting rig must be examined qualified, data of applying for checking and examination
It is complete, check whether site road, place, power supply for construction, the scaffold job platform set up meet construction requirement, referring to Fig. 1
And Fig. 2, before the blanking of standpipe 10, the levelness of each pipeline is adjusted, scene is checked size, accomplishes accurate, standpipe
10 cutting lengths should be checked before should deducting the spacer thickness between steam turbine equipment mouthful flange 30 and pipe flange 11, pipe string
Whether bevel angle is qualified, and whether groove is colored qualified, and the perforate 107# of instrument element must be completed before welding, after avoiding
Continuous welding slag cleaning work.
The plumber for answering selection techniques level higher is constructed, it is ensured that installation quality, selects and appoints the welder that solder yield is high
Welded, it is ensured that welding quality.
(2) making and installation of falsework
See Fig. 2 and Fig. 3, from HW200*200 section steel manufacture the first falsework 50 and the second falsework 51, each
Falsework includes being respectively arranged with four pieces of jackscrews 53 on the through hole 52 passed through for standpipe 10, the perisporium of each through hole 52, this four pieces tops
Silk 53 is equidistantly uniformly distributed along the circumference of through hole 52, and the first falsework 50 and the second falsework 51 are filled by setscrew
In the concrete foundation 60 below steam turbine equipment mouthful flange 30, the first falsework 50 is away from steam turbine equipment mouthful flange 1m
(can certainly be other numerical value between 0.8~1.2m), the second falsework 51 (also may be used certainly away from the first falsework 2m
To be other numerical value between 1.8~2.2m).
(3) hoisting tool special is made
Referring to Fig. 4, hoisting tool special includes elongated bottom plate 70 and two pairs of hangers 71, and elongated bottom plate 70 uses steel plate system
Make, its thickness is 30mm, and length is 200mm, and the two ends of elongated bottom plate 70 open up two and the through hole phase on pipe flange 11
One pair of which hanger in bolt hole 72 with (eye distance and diameter are all identical), two pairs of hangers 71 is located at the elongated left side of bottom plate 70,
And at 1/3 position of the elongated length of bottom plate 70, another pair hanger is arranged on the elongated right-hand member of bottom plate 70.
(4) pipe laying flange
Referring to Fig. 2 and Fig. 4, on two bolts hole 72 that pipe flange 11 is mounted in the elongated left side of bottom plate 70 by bolt,
A weight and the identical object (not shown) of pipe flange 11 are lifted in the elongated right-hand member of bottom plate 70, by the large and small of driving
Gib head (not shown) is hooked on two pairs of hangers 71 while lifting by crane, to ensure that hoisting tool special is in balance respectively
In state, the gap that pipe flange 11 is sent to the lower section of steam turbine equipment mouthful flange 30, when pipe flange 11 can not completely in place
When need manually to move and adjust pipe flange 11, complete tube method using 4 sets of bolts and 4mm thick temporary shim
Orchid 11 and the installation of steam turbine equipment mouthful flange 30, measure the pipe flange 11 and steam turbine equipment mouthful flange 30 the depth of parallelism and
Concentricity, parallel misalignment≤0.25mm, Concentricity tolerance≤0.5mm.
(5) lifting of standpipe
See Fig. 2,105# and 106# mouthfuls of welding of the bottom of standpipe 10 are completed on the ground, must be carried out in welding process anti-
The control measure of welding deformation are so as to ensure the perpendicularity of standpipe 10, and timely butt welding mouth carries out heat treatment and lossless after the completion of welding
Detection, complies with requirement, and after 105# and 106# mouthfuls of welding is qualified, the suspension centre of chain block (not shown) is arranged on
On falsework, and the bottom of pipe flange 11 is promoted to after standpipe 10 to be sequentially passed through to using it through hole 52 on two falseworks
Portion.
(6) fixation and spot welding of standpipe
See Fig. 2, check that 108# and 104# mouthfuls of the two ends of standpipe 10 are installed jet chimney with pipe flange 11 and in advance respectively
Unfitness of butt joint and gap between 20, by the jackscrew 53 (see Fig. 3) on two falseworks to the 108# at the two ends of standpipe 10 and
104# mouthfuls in group pair the unfitness of butt joint that produces and gap be finely adjusted, meet after welding procedure guiding book, will be vertical using jackscrew 53
Pipe 10 is fixed, then to 108# and 104# mouthfuls of progress spot welding, and the fixation stock material of spot welding is identical with the material of standpipe 10, spot welding
Shi Buneng is organized pair by force by external force, to prevent that standpipe 10 is deformed during welding.
(7) standpipe is welded
See Fig. 2, pipe flange 11 is removed with 4 sets of bolts that steam turbine equipment mouthful flange 30 is connected, used first
The symmetrical equidirectional welding manner of double welders is welded to the 108# mouths on the top of standpipe 10, and being often soldered together will be to pipe flange
11 depth of parallelism and concentricity is checked, it is ensured that it is in prescribed limit, if it find that deviation, adjusts welding method in time,
This one side diminished to the gap of pipe flange 11 welded, so as to shrink the weld seam of its symmetry direction so that pipe flange 11
Gap shrinks.It is slow during welding, and check continually in welding the change in its gap, caused in order to avoid welding is excessive between script
The small one side of gap becomes greatly, by that analogy again.Welding is completed, and weld seam is heat-treated in time after after weld bond cooling, heat treatment is closed
Nondestructive inspection is carried out after lattice；
104# mouthfuls are finally welded, two falseworks can not loosen during welding, must be firm, it is ensured that pipe flange 11
The depth of parallelism and concentricity are all in prescribed limit.Send special messenger to be monitored steam turbine equipment mouthful flange 30 during welding, find different
Reason condition should adjust welding method immediately.
The mouth of pipe fills in pipeline welding process inspection record when welding, and parameter when record is welded in detail is (when welder number, welding
Between, welding current, weldingvoltage, the welding number of plies, welding road number, the wlding trade mark, wlding specification, preheating temperature, temperature, inspection between road
Look into the time).
(8) installation of PRESSURE TESTING BLIND FLANGE
After the heat treatment of all weld seams, Non-Destructive Testing are qualified, three constant force close to steam turbine equipment mouthful flange 30 are removed
Spring support hanging frame VS101, VS102, VS106 (see Fig. 1), referring to Fig. 2, the top surface of pipe flange 11 declines 320mm (can certainly
It is other numerical value between 300~350mm), reserve the space for installing PRESSURE TESTING BLIND FLANGE 40.In order to avoid constant-force spring hanger is torn open
After removing, pipe-line system is naturally drooped in the state of water-filling, is prevented pipe-line system from deforming and is influenceed final unstressed look for
Just, one temporary support of each support (does not show in figure at three constant-force spring hangers VS101, VS102, VS106 of dismounting
Go out), the temporary support is fabricated to " door " font using common I-steel or H profile steel, and preassembled jet chimney 20 is put
Put in the temporary support top of the trellis.PRESSURE TESTING BLIND FLANGE 40 is lifted to pipe flange 11 by the hoisting tool special of step (3) and pushed up
Installed on face, its hanging method is identical with lifting pipe flange 11, therefore does not repeat herein, and the PRESSURE TESTING BLIND FLANGE 40 after installation is shown in
Shown in Fig. 2.
(9) pressure testing is carried out to whole pipe-line system, test pressure reaches 33.71MPa, and pressure testing is disposably qualified, specifically
Pressure-measuring method is same as the prior art, therefore does not repeat herein.
(10) pipeline resets
After pressure testing is qualified, three temporary supports in step (7) are removed, by three constant-force spring hangers of dismounting
VS101, VS102, VS106 reset, the depth of parallelism, concentricity and the flange of adjustment steam turbine equipment mouthful flange 30 and pipe flange 11
Face gap, meets after producer's requirement, is fixed standpipe 10 by jackscrew 53, and set pipe flange 11 and steam turbine by bolt
Standby mouth flange 30 is docked.
When being related to welding in above steps, before welding, to be further ensured that welding quality, using argon arc welding
Bottom is taken, from Φ 2.4mm welding wire, argon flow amount is that 12L/min (can certainly be other between 10~15L/min
Numerical value).Weld preheating is carried out to welding wire using Electric heating, it (can certainly be 150~200 DEG C that preheating temperature, which is 180 DEG C,
Between other numerical value), welding current during welding is 100A (can certainly be other numerical value between 80~120A), weldering
Voltage is connect for 16V (can certainly be other numerical value between 12~18V), speed of welding is that 5.5cm/min (can certainly
It is other numerical value between 5~6cm/min), thickness is that 2.8mm (can certainly be other numbers between 2.5~3.0mm
Value).
After welding, it is filled and capping by SMAW, using double symmetrical, multi-pass welding, with effective
Reduce welding deformation.Weld preheating is carried out to welding rod using Electric heating, preheating temperature be 220 DEG C (can also be 200~
Other numerical value between 250 DEG C), interlayer temperature control is in 260 DEG C (they can also be other numerical value between 200~300 DEG C), weldering
Bar amplitude of fluctuation is at less than 4 times of core diameter, and welding current is 110A (can also be other numerical value between 95~120A),
Speed of welding is 6cm/min (can also be other numerical value between 5~7cm/min).
After welding, using Electric heating control post weld heat treatment heating-up temperature, temperature control at 760 DEG C (certainly
Can be other numerical value between 750~770 DEG C), and then ensure that heat treatment is disposable in place.
Whole welding, heat treatment process are both needed to monitor the depth of parallelism, same of pipe flange 11 and steam turbine equipment mouthful flange 30
Heart degree and flange face gap, it is ensured that it is in prescribed limit.
Adjust constant-force spring hanger when, should from distant place to steam turbine at adjust one by one, that is, drawing near is adjusted,
When adjusting spring, only the load bolt on rotatable constant-force spring hanger, is advisable with that can remove clamping block with hand.Refer to Fig. 1,
Suspension and support VS104 is adjusted first, suspension and support VS107 is then adjusted, then adjusts suspension and support VS103, the like, treat all springs
It is adjusted to meet after producer's requirement, first the spring clamping block on suspension and support VS104, VS107, VS103 can be removed, then unclamps
Jackscrew 53 on falsework, and check whether the clamping block of remaining constant-force spring hanger has loosening.If any indivedual springs not
Reach that producer requires, standpipe 10 should be retightened, then adjust spring, the stress of each spring is attained by design load, close
Jackscrew 53 is unclamped after lattice.If still there is individual locks block to be removed with hand, it can be finely adjusted, treated by load adjustment bolt
After all clamping blocks, then the flange face depth of parallelism, concentricity and gap are measured, now it is possible that the gap of flange face, flat
Row degree is undesirable, if there is such case, and further adjustment is also done to constant-force spring hanger.Gap length can pass through
Load bolt on elastic suspension and support VS104 is adjusted, and north and south error can be adjusted by suspension and support VS106, tube method
When 11 north openings of orchid are larger, load bolt need to be lowered, otherwise is risen, thing error can be adjusted by suspension and support VS102,
When the west opening of pipe flange 11 is larger, load bolt need to be lowered, otherwise is risen.
When adjusting constant-force spring hanger it is possible that the larger situation of power up or down, can now use jack
Or other measures give spring one opposition, when spring is adjusted to free state, then remove jack or other measures.
Before formally adjustment spring, to determine that the setting height(from bottom) of all constant-force spring hangers meets design requirement, it is permanent
Basis, built-in fitting or the steel construction and drawing that power spring support hanging frame is installed are consistent, meet producer and design requirement.
After being operated using the above method, it can disposably pass through the examination of producer, owner and management.Construction method of the present invention is obtained
Good utilization is arrived, it can be ensured that the integral installation quality of unit.
The technology of the present invention is advanced, cost is low, safe and reliable, reduces construction cost, improves efficiency of construction, it is ensured that applies
Work safety and construction quality.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention
Various modifications and improvement that case is made, all should fall within the scope of protection of the present invention.
Claims (9)
1. a kind of overall pressure testing of Steam Turbine jet chimney, overall Stressless Pipeline Connection construction method, it is characterised in that including as follows
Step：
(1) preparation of construction
All raw material, electric welding machine during construction, heat treatment equipment, that hoisting rig must be examined is qualified, and apply for checking and examination all information,
Check whether site road, place, power supply for construction, the scaffold job platform set up meet construction requirement, standpipe (10) blanking
Before, the levelness of each pipeline is adjusted, scene is checked size, accomplishes accurate, standpipe (10) cutting length should be detained
Except the spacer thickness between steam turbine equipment mouthful flange (30) and pipe flange (11), it should check that bevel angle is before pipe string
No qualified, whether groove is colored qualified；
(2) making and installation of falsework
The first falsework (50) and the second falsework (51) are made, each falsework includes what is passed through for standpipe (10)
Some jackscrews (53), the first falsework (50) and the second falsework are respectively arranged with through hole (52), the perisporium of each through hole (52)
(51) in the concrete foundation (60) below steam turbine equipment mouthful flange (30), the first falsework (50) is away from steam turbine
The equipment mouthful 0.8~1.2m of flange (30), the second falsework (51) is away from the 1.8~2.2m of the first falsework (50)；
(3) hoisting tool special is made
Hoisting tool special includes elongated bottom plate (70) and two pairs of hangers (71), the two ends of elongated bottom plate (70) open up two and
One pair of which hanger in the bolt hole (72) that through hole on pipe flange (11) matches, two pairs of hangers (71) is located at elongated bottom plate
(70) left side, and at 1/3 position of elongated bottom plate (70) length, it is right that another pair hanger is arranged on elongated bottom plate (70)
End；
(4) pipe laying flange
Pipe flange (11) is mounted on two bolts hole (72) on the left of elongated bottom plate (70) by bolt, in elongated bottom plate
(70) right-hand member lifts a weight and pipe flange (11) identical object, and the large and small gib head of driving is hooked on into two pairs respectively
Lifted by crane simultaneously on hanger (71), pipe flange (11) is sent in the gap below steam turbine equipment mouthful flange (30), 4 sets are utilized
Bolt and 4mm thick temporary shim completes the installation of pipe flange (11) and steam turbine equipment mouthful flange (30), measurement
The depth of parallelism and concentricity of the pipe flange (11) and steam turbine equipment mouthful flange (30), parallel misalignment≤0.25mm, with one heart
Spend deviation≤0.5mm；
(5) lifting of standpipe
The 105# and 106# mouthfuls of welding of standpipe (10) bottom are completed on the ground, and ensures the perpendicularity of the standpipe (10) and prevents
The control requirement of welding deformation, timely butt welding mouth is heat-treated and Non-Destructive Testing, complies with requirement, treat 105# and 106# mouthfuls
After welding is qualified, the suspension centre of chain block is arranged on falsework, and standpipe (10) is sequentially passed through two using it and is faced
When support on through hole (52) after be promoted to pipe flange (11) bottom；
(6) fixation and spot welding of standpipe
Check 108# and 104# mouthful of standpipe (10) two ends respectively with pipe flange (11) and advance installation jet chimney (20) it
Between unfitness of butt joint and gap, by the jackscrew (53) on two falseworks to 108# and 104# mouthfuls of standpipe (10) two ends in group
Pair when the unfitness of butt joint that produces and gap be finely adjusted, meet after welding procedure guiding book, it is using jackscrew (53) that standpipe (10) is solid
It is fixed, spot welding then is carried out to 108# and 104# mouthful, can not by force be organized by external force during spot welding pair；
(7) standpipe is welded
4 sets of bolts that pipe flange (11) is connected with steam turbine equipment mouthful flange (30) are removed, first using double welders
Symmetrical equidirectional welding manner is welded to the 108# mouths on standpipe (10) top, and being often soldered together will be to pipe flange (11)
The depth of parallelism and concentricity checked, it is ensured that its in prescribed limit, welding complete, after weld bond cooling after weld seam is entered in time
Row heat treatment, be heat-treated it is qualified after carry out nondestructive inspection, finally weld 104# mouthful, it is ensured that the depth of parallelism of pipe flange (11) and together
Heart degree is all in prescribed limit；
(8) installation of PRESSURE TESTING BLIND FLANGE
After the heat treatment of all weld seams, Non-Destructive Testing are qualified, three constant force bullets close to steam turbine equipment mouthful flange (30) are removed
Spring bearing hanger (VS101, VS102, VS106), pipe flange (11) top surface declines 300~350mm, reserves installation PRESSURE TESTING BLIND FLANGE
(40) space, a temporary support is respectively supported at three constant-force spring hanger (VS101, VS102, VS106) places of dismounting
Frame, PRESSURE TESTING BLIND FLANGE (40) is lifted to pipe flange (11) top surface installed by the hoisting tool special of step (3)；
(9) pressure testing is carried out to whole pipe-line system；
(10) pipeline resets
After pressure testing is qualified, three temporary supports in step (7) are removed, by three constant-force spring hangers of dismounting
(VS101, VS102, VS106) resets, the depth of parallelism, the concentricity of adjustment steam turbine equipment mouthful flange (30) and pipe flange (11)
And flange face gap, it is qualified after, it is by jackscrew (53) that standpipe (10) is fixed, and by bolt by pipe flange (11) and steamer
Machine equipment mouthful flange (30) docking.
2. the overall pressure testing of Steam Turbine jet chimney according to claim 1, overall Stressless Pipeline Connection construction method, it is special
Levy and be：Before welding, using argon arc welding bottoming, from Φ 2.4mm welding wire, argon flow amount is 10~15L/min.
3. the overall pressure testing of Steam Turbine jet chimney according to claim 2, overall Stressless Pipeline Connection construction method, it is special
Levy and be：Weld preheating is carried out to welding wire using Electric heating, preheating temperature is 150~200 DEG C, welding current during welding
For 80~120A, weldingvoltage is 12~18V, and speed of welding is 5~6cm/min, and thickness is 2.5~3.0mm.
4. the overall pressure testing of Steam Turbine jet chimney according to claim 1, overall Stressless Pipeline Connection construction method, it is special
Levy and be：It is filled by SMAW and capping, using double symmetrical, multi-pass welding.
5. the overall pressure testing of Steam Turbine jet chimney according to claim 4, overall Stressless Pipeline Connection construction method, it is special
Levy and be：Weld preheating is carried out to welding rod using Electric heating, preheating temperature is 200~250 DEG C, and interlayer temperature control exists
200~300 DEG C, welding rod amplitude of fluctuation is at less than 4 times of core diameter, and welding current is 95~120A, and speed of welding is 5~
7cm/min。
6. the overall pressure testing of Steam Turbine jet chimney according to claim 1, overall Stressless Pipeline Connection construction method, it is special
Levy and be：The heating-up temperature of post weld heat treatment is controlled using Electric heating, temperature control is at 750~770 DEG C.
7. the overall pressure testing of Steam Turbine jet chimney according to claim 1, overall Stressless Pipeline Connection construction method, it is special
Levy and be：When finding deviation in step (6), this one side diminished to pipe flange (11) gap is welded.
8. the overall pressure testing of Steam Turbine jet chimney according to claim 1 to 7 any claim, overall unstressed match somebody with somebody
Pipe construction method, it is characterised in that：Whole welding, heat treatment process are both needed to monitoring pipe flange (11) and steam turbine equipment mouthful method
The depth of parallelism, concentricity and the flange face gap of blue (30), it is ensured that it is in prescribed limit.
9. the overall pressure testing of Steam Turbine jet chimney according to claim 1 to 7 any claim, overall unstressed match somebody with somebody
Pipe construction method, it is characterised in that：Temporary support is fabricated to " door " font using common I-steel or H profile steel, will pacify in advance
The jet chimney of dress is placed on the temporary support top of the trellis.
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| CN109163862A (en) * | 2018-08-15 | 2019-01-08 | 招商局重工（江苏）有限公司 | A kind of pressure-measuring method of pipe fitting |
| CN110270773A (en) * | 2019-06-14 | 2019-09-24 | 国家能源投资集团有限责任公司 | The construction method of compressor set Stressless Pipeline Connection |
| CN110815112A (en) * | 2019-10-29 | 2020-02-21 | 上海宝冶集团有限公司 | Method for installing cold-tightening opening of high-temperature and high-pressure steam pipeline |
| CN113084317A (en) * | 2021-04-15 | 2021-07-09 | 中建安装集团有限公司 | Large-diameter high-temperature pipeline installation and adjustment method |
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| CN108871941A (en) * | 2018-08-15 | 2018-11-23 | 招商局重工（江苏）有限公司 | A kind of structure for pressure test of pipe fitting |
| CN109163862A (en) * | 2018-08-15 | 2019-01-08 | 招商局重工（江苏）有限公司 | A kind of pressure-measuring method of pipe fitting |
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| CN113084317A (en) * | 2021-04-15 | 2021-07-09 | 中建安装集团有限公司 | Large-diameter high-temperature pipeline installation and adjustment method |
| CN113634939A (en) * | 2021-08-30 | 2021-11-12 | 中国电建集团四川工程有限公司 | Stress-free butt welding method for pipeline gold welding opening |
| CN114147321A (en) * | 2021-11-29 | 2022-03-08 | 中国化学工程第六建设有限公司 | Low-temperature pump stress-free tubing construction method |
| CN114393386A (en) * | 2022-01-25 | 2022-04-26 | 山东欣盛信息科技有限公司 | Assembly equipment of geothermal energy generating set |
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