CN107262762B - A kind of construction method of the gas pipeline with angled aperture - Google Patents
A kind of construction method of the gas pipeline with angled aperture Download PDFInfo
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- CN107262762B CN107262762B CN201710552414.9A CN201710552414A CN107262762B CN 107262762 B CN107262762 B CN 107262762B CN 201710552414 A CN201710552414 A CN 201710552414A CN 107262762 B CN107262762 B CN 107262762B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
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Abstract
A kind of construction method the invention discloses gas pipeline with angled aperture includes the following steps: Step 1: preparation of construction: determining construction operation point, excavates working pit according to pipe position and field condition；Step 2: installation four-way: Step 3: welding: Step 4: welding non-destructive testing；Step 5: installation sandwich valve: Step 6: installation header: Step 7: leak test: Step 8: the disconnected pipe of aperture.The present invention provides a kind of construction method of the gas pipeline with angled aperture and combines non-destructive testing technology in gas pipeline aperture field, and according to the inclined degree of tapping machine select varying strength bolt connection support with adjustable is applied simultaneously, so that the safety of tapping machine tilt operation is largely increased.
Description
Technical field
A kind of construction method the present invention relates to gas pipeline engineering field more particularly to gas pipeline with angled aperture.
Background technique
The aperture on gas pipeline is that the important step for blocking operation is realized on gas pipeline.Tapping machine is used at present
When aperture, due to the limitation of working space, such as the blocking of surrounding structures and other pipelines, cause in many cases, institute
The hole opened can not be the need for certain tilt angle in the surface of main pipe, even horizontal bore.
The current this aperture with tilt angle does not take the measure of support tapping machine when tilt angle is little,
But by the mechanical connection between tapping machine and header, sandwich valve, it is made to fix and work.When horizontal bore, with sleeper branch
Support tapping machine.There is security risk in fact in such simple support.Firstly, the psychological pressure of on-site personnel is caused,
Field personnel can generate psychological pressure and burden, may feel that tapping machine has the tendency that in their subconsciousness, generate
Tension, and tapping machine can be subconsciously paid close attention to always, rather than the feed process of cutter is absorbedly paid close attention to, cause people
The scatterbrained potential risk of member.Secondly, the self weight of tapping machine, causes it when tilting operation, sandwich valve two sides bolt
Unbalance stress will result in mechanical impaired, generation gas leakage accidents, influence when this unbalance stress reaches a certain level
Aperture operation is normally carried out, while influencing the intensity of aperture part weld seam, increases the hidden danger of pipeline safety operation.
Summary of the invention
Clamping rigidity is kept in welding direction the technical problem to be solved by the present invention is to welding equipment and will not be reduced super
Acoustic vibration transmission efficiency, to solve the above-mentioned problems, the present invention provide a kind of construction method of the gas pipeline with angled aperture,
Include the following steps:
Step 1: preparation of construction: determining construction operation point, excavate working pit according to pipe position and field condition；
Step 2: installation four-way: removing the outer anti-corrosion of main pipe, polishing welding seams, four-way installation positioning；The upper tile of four-way is covered
The weld seam of lid main pipe surface portion polishes, the end face of flange to ensure four-way it is horizontal and with main pipe centerline parallel；
Step 3: welding: carrying out weld job to polishing treated main pipe and four-way；
Step 4: welding non-destructive testing；
Step 5: installation sandwich valve: removing the impurity on the flange of four-way, be placed in gasket, by bolt and nut by clamping plate
Valve is fixed on the flange of four-way, and uses the higher bolt of tensile strength in the side opposite with tapping machine inclined direction；
Step 6: installation header: positioning ring is disposed in the upper surface of sandwich valve, by the header being connected, cutter, center
It bores and tapping machine is fixed on the upper surface of sandwich valve by bolt and nut, and used in the side opposite with tapping machine inclined direction
The higher bolt of tensile strength；The oil circuit for connecting tapping machine and hydraulic station, connects the power supply of hydraulic station；
Support with adjustable when tapping machine is tilted operation is supported below tapping machine, and according to the tilt angle of tapping machine
Adjust the tilt angle of support；
Step 7: leak test: carrying out tightness with 1.15 times of air pressure injecting compressed air of pipe design pressure
Test, record pump meter reading, checks whether four-way part, sandwich valve, header, tapping machine, weld seam etc. have leakage, after sixty minutes
Control reading, reading if any leakage, take corresponding measure to exclude, then carry out leak test, qualified rear without qualification is fallen to
Next process can be entered；
Step 8: the disconnected pipe of aperture.
Further, in step 3, the form of the welding of main pipe and four-way includes butt weld and to fillet weld.
Further, in step 4, non-destructive testing specifically comprises the following steps:
1), workpiece surface is pre-processed, removes grease, iron rust, oxide skin or other adherency magnetic powders of workpiece surface
Substance；
2) workpiece, is magnetized using yoke method, magnetizing current is selected according to standard test piece experimental result, magnetic yoke is wanted in magnetization
The same position of cross-magnetizing, in order to avoid missing inspection；Poor contact when because caliber change leads to magnetization, need to fill out steel plate in caliber lower
To improve magnetization condition；
3) it, demagnetizes, magnetic yoke chemical industry part is left 1 meter of workpiece or more and is shut down again；
4), testing result provides evaluation report.
It further, further include the adjustable branch for being used to support tapping machine when tapping machine tilts operation in step 6
Seat, support with adjustable when tapping machine tilts operation include bottom-up sequentially connected support base, inclined shore frame and open
Hole machine supporting bable tops；Support base includes 4 lower supporting legs being aligned two-by-two, and lower supporting leg horizontally passes through welding channel steel and connects
It connects, lower supporting leg is connected by first crossbar in the longitudinal direction；Inclined shore frame includes 2 upper support length being arranged successively along longitudinal direction
Leg and 2 upper support short-legs, 2 upper support long leg tip heights are identical, support short-leg tip height identical under 2, support is grown
Leg is connected with corresponding support short-leg by second crossbar respectively, the both ends of tapping machine supporting bable tops respectively with the top that supports long leg
End and the top of support short-leg are connected；The two sides of upper support long leg, upper support short-leg and tapping machine supporting bable tops are respectively arranged with
It being capable of mutually matched lockpin hole；Pass through the lockpin hole of the two sides of selection tapping machine supporting bable tops and upper support long leg and upper support
The cooperation of the lockpin hole of short-leg can adjust the height and tilt angle of tapping machine supporting bable tops.
Further, plane bed course or wedge-shaped bed course are additionally provided with above tapping machine supporting bable tops；The wedge of wedge-shaped bed course
Shape angle is 5 °.
Further, in step 8, aperture is broken, and specific step is as follows for pipe:
1), after pass the test, the manual feed of centre drill after semi shield oil cylinder contacts main pipe, is counted to main pipe, counter clear is contacted
Number device is zeroed again, and then the manual feed of centre drill retreats 5mm to main pipe is contacted, start generator, opens hydraulic station, opens
Tapping machine carries out aperture operation to tube body, gradually increases hydraulic station output pressure, controls the slow feed of flow, avoid cutter by
Damage occurs abnormal sound and answers hard stop inspection；
2), when cutting stroke data representation to rated value, hydraulic station output pressure is unloaded pressure, and Tool in Cutting sound stops
When only, as judge aperture whether main foundation in place, close hydraulic station after the completion of confirmation aperture.
Further, be provided with lockpin hole in first crossbar and second crossbar, by select first crossbar lockpin hole and
The cooperation of the lockpin hole of lower supporting leg and the lockpin hole of simultaneous selection second crossbar and corresponding upper support long leg, upper support short-leg
Lockpin hole cooperation, the width of support with adjustable in the longitudinal direction can be adjusted；By supporting long leg, upper support short-leg in selection
With the lockpin hole cooperation of corresponding lower supporting leg, the height of adjustable support table top can be adjusted.
Further, in use, in plane bed course or wedge-shaped bed course watering, make its moistened surface.
Further, the actual angle of inclination according to tapping machine in operation selects one or more plane bed courses, or choosing
One or more wedge-shaped bed courses are selected, or selection plane bed course and wedge-shaped bed course are applied in combination.
The invention has the following beneficial effects:
The present invention provides a kind of construction method of the gas pipeline with angled aperture and combines nothing in gas pipeline aperture field
Detection technique is damaged, and selects the bolt of varying strength to connect while applying support with adjustable according to the inclined degree of tapping machine,
So that the safety of tapping machine tilt operation is largely increased.
Detailed description of the invention
Fig. 1 is the structural representation that non-destructive testing is welded in a kind of construction method of the gas pipeline with angled aperture of the invention
Figure；
Fig. 2 is the main view of the support with adjustable in a kind of construction method of the gas pipeline with angled aperture of the invention.
Fig. 3 is the side view of the support with adjustable in a kind of construction method of the gas pipeline with angled aperture of the invention.
In figure, lower supporting leg 11, first crossbar 12, welding channel steel 13, upper support long leg 21, upper support short-leg 22, second
Cross bar 23, tapping machine supporting bable tops 31, bed course 32, lockpin hole 4, magnetic yoke 5, workpiece 6, steel plate 7.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and referring to data.It should be understood that embodiment is intended merely to lift
Example illustrates the present invention, rather than limits the range of invention in any way.
As shown in Figure 1-3, the present invention provides a kind of construction method of the gas pipeline with angled aperture, include the following steps:
Step 1: preparation of construction: determining construction operation point, excavate working pit according to pipe position and field condition；Equipment is marched into the arena
Before, check various kinds of equipment, part, spare part fine status, it is ensured that hydraulic station oil level be higher than safety levels, guarantee generator, sky
The equipment working conditions such as press are good.Upper and lower watt of four-way part factory number will correspond, and sandwich valve, header, four-way part coincide
Place checks sealing element, it is ensured that without aging and disrepair phenomenon, it is ensured that cutter, centre drill cutting blade are sharp without wound；
It pays close attention to: if the cutter tooth of cutter has continuous three tooth to damage, or if a total of damage more than five teeth of cutter,
Cutter is replaced immediately
Step 2: installation four-way: removing the outer anti-corrosion of main pipe, polishing welding seams, four-way installation positioning；The upper tile of four-way is covered
The weld seam of lid main pipe surface portion polishes, the end face of flange to ensure four-way it is horizontal and with main pipe centerline parallel；
Step 3: welding: carrying out weld job to polishing treated main pipe and four-way；
Step 4: welding non-destructive testing；
Step 5: installation sandwich valve: removing the impurity on the flange of four-way, be placed in gasket, by bolt and nut by clamping plate
Valve is fixed on the flange of four-way, and uses the higher bolt of tensile strength in the side opposite with tapping machine inclined direction；It puts
The positioning ring of cleaning, drying is set, positive stop is installed.Four-way part and two flange face Superficial Foreign Bodies of sandwich valve are removed, are kept
End face dry cleansing, install sandwich valve, be close to connected nut (sandwich valve should be at closed state when installation, so as to lift balance,
Advantageous leakproofness)；
Step 6: installation header: positioning ring is disposed in the upper surface of sandwich valve, by the header being connected, cutter, center
It bores and tapping machine is fixed on the upper surface of sandwich valve by bolt and nut, and used in the side opposite with tapping machine inclined direction
The higher bolt of tensile strength；The oil circuit for connecting tapping machine and hydraulic station, connects the power supply of hydraulic station；
Support with adjustable when tapping machine is tilted operation is supported below tapping machine, and according to the tilt angle of tapping machine
Adjust the tilt angle of support；
Step 7: leak test: carrying out tightness with 1.15 times of air pressure injecting compressed air of pipe design pressure
Test, record pump meter reading, checks whether four-way part, sandwich valve, header, tapping machine, weld seam etc. have leakage, after sixty minutes
Control reading, reading if any leakage, take corresponding measure to exclude, then carry out leak test, qualified rear without qualification is fallen to
Next process can be entered；
Step 8: the disconnected pipe of aperture.
In one embodiment, in step 3, the form of the welding of main pipe and four-way includes butt weld and to fillet welding
Seam.Because closure four-way design of part uses mechanism pipe fitting, scene must not make any modification.Burning line material is generally carbon
Steel and low-alloy steel, the relatively easy fixation of selected welding material are usually not required to using preheating and other ancillary measures.Four-way
The welding of part and former pipe is mainly twice butt weld and two diagonal cut miter joints, and welding can use manual electric arc welding or semi-automatic
CO2Gas shielded arc welding.
In one embodiment, in step 4, non-destructive testing specifically comprises the following steps:
1), workpiece surface is pre-processed, removes grease, iron rust, oxide skin or other adherency magnetic powders of workpiece surface
Substance；
2), as shown in Figure 1, magnetizing workpiece using yoke method, magnetizing current is selected according to standard test piece experimental result, in magnetic
Magnetic yoke wants the same position of cross-magnetizing when change, in order to avoid missing inspection；Magnetic yoke poor contact when because caliber change leads to magnetization, need to be in pipe
Steel plate is filled out to improve magnetization condition in diameter lower；The magnetic line of force and defect table in workpiece when detecting are needed due to yoke method magnetization
The orientation of face or defect is perpendicular, can just obtain magnetic flux leakage as strong as possible, but due to the variation of caliber in practice of construction,
The effect that will lead to non-destructive testing is undesirable, therefore those skilled in the art tend not to magnetize workpiece using yoke method to carry out
Non-destructive testing, and the application is innovatively filled out in caliber lower with the steel plate of pipeline same material improves magnetization condition, it is real
In the application of border, non-destructive testing works well, and due to only need to simply fill out the steel plate of one piece of same material i.e. in processing step
It can be achieved, be conducive to large-scale application of the non-destructive testing in construction.
3) it, demagnetizes, magnetic yoke chemical industry part is left 1 meter of workpiece or more and is shut down again；
4), testing result provides evaluation report.By magnetic powder in JB/T4730.4 " bearing device non-destructive testing Magnetic testing "
Detection quality grading carries out evaluation rank, provides evaluation report.
It in one embodiment, further include the support with adjustable for being used to support tapping machine when tapping machine tilts operation,
In step 6, tapping machine tilt operation when support with adjustable include bottom-up sequentially connected support base, inclined shore
Frame and tapping machine supporting bable tops；Support base includes 4 lower supporting legs being aligned two-by-two, and lower supporting leg horizontally passes through welding
Channel steel connection, lower supporting leg are connected by first crossbar in the longitudinal direction；Inclined shore frame includes on 2 be arranged successively along longitudinal direction
Long leg and 2 upper support short-legs are supported, 2 upper support long leg tip heights are identical, and support short-leg tip height identical under 2,
Support long leg is connected with corresponding support short-leg by second crossbar respectively, and the both ends of tapping machine supporting bable tops are grown with support respectively
The top of leg and the top of support short-leg are connected；The two sides difference of upper support long leg, upper support short-leg and tapping machine supporting bable tops
Being provided with being capable of mutually matched lockpin hole；By select tapping machine supporting bable tops two sides lockpin hole and upper support long leg and
The cooperation of the lockpin hole of upper support short-leg can adjust the height and tilt angle of tapping machine supporting bable tops.First crossbar and second
It is provided with lockpin hole on cross bar, by the cooperation of the lockpin hole of the lockpin hole and lower supporting leg of selection first crossbar, and selects simultaneously
The cooperation for selecting the lockpin hole and corresponding upper support long leg, the upper lockpin hole for supporting short-leg of second crossbar, can adjust adjustable branch
The width of seat in the longitudinal direction；It, can by supporting the lockpin hole cooperation of long leg, upper support short-leg and corresponding lower supporting leg in selection
Adjust the height of adjustable support table top.Since in practical aperture operation, construction environment is more complicated, band angle is often encountered
The case where spending aperture construction, and in the case where band angled aperture operation, since tapping machine is in heeling condition, it will lead to aperture
Machine, sandwich valve, four-way and main pipe will receive the effect of torsion in junction, which is easy to cause all parts in construction
The weld of junction, especially four-way and main pipe generates destruction, so as to cause in the work progress after non-destructive testing, still cannot
Determine whether the welding of four-way and main pipe is lossless, and the support with adjustable of the application can offset the torsion in construction action,
To prevent four-way and the weld of main pipe from generating secondary injury, the aperture operation of on-line production gas pipeline is realized, improve construction effect
Rate reduces construction failure rate.
May be implemented in limited operating space, place support, and the lower supporting leg of support, upper supporting leg, cross bar,
It can be connected, and can be connect by the lockpin hole with different location by general lock pin, realize height, the width of support
Degree variation, realizes the variation of tapping machine supporting bable tops tilt angle.
In one embodiment, plane bed course or wedge-shaped bed course are additionally provided with above tapping machine supporting bable tops；Wedge piece
The key groove of layer is 5 °.
In one embodiment, in step 8, aperture is broken, and specific step is as follows for pipe:
1), after pass the test, the manual feed of centre drill after semi shield oil cylinder contacts main pipe, is counted to main pipe, counter clear is contacted
Number device is zeroed again, and then the manual feed of centre drill retreats 5mm to main pipe is contacted, start generator, opens hydraulic station, opens
Tapping machine carries out aperture operation to tube body, gradually increases hydraulic station output pressure, controls the slow feed of flow, avoid cutter by
Damage occurs abnormal sound and answers hard stop inspection；
2), when cutting stroke data representation to rated value, hydraulic station output pressure is unloaded pressure, and Tool in Cutting sound stops
When only, as judge aperture whether main foundation in place, close hydraulic station after the completion of confirmation aperture.Must have when machine run
People's measuring instrument data, operating personnel must not leave operation field.
It is in embodiment, to be provided with lockpin hole in first crossbar and the second crossbar at one, by selecting described the
The lockpin hole of second crossbar described in the cooperation and simultaneous selection of the lockpin hole of the lockpin hole of one cross bar and lower supporting leg and it is corresponding on
The cooperation for supporting long leg, the upper lockpin hole for supporting short-leg, can adjust the width of the support with adjustable in the longitudinal direction；Pass through choosing
The lockpin hole cooperation for selecting the upper support long leg, upper support short-leg and corresponding lower supporting leg, can adjust the adjustable support
The height of table top.
It is in use, in plane bed course or wedge-shaped bed course watering, to make its moistened surface in embodiment at one.
It is, according to actual angle of inclination of the tapping machine in operation, to select one or more planes in embodiment at one
Bed course, or the one or more wedge-shaped bed courses of selection, or selection plane bed course and wedge-shaped bed course are applied in combination.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (8)
1. a kind of construction method of gas pipeline with angled aperture, which comprises the steps of:
Step 1: preparation of construction: determining construction operation point, excavate working pit according to pipe position and field condition；
Step 2: installation four-way: removing the outer anti-corrosion of main pipe, polishing welding seams, four-way installation positioning；The upper tile of four-way is covered female
The weld seam of pipe surface part polishes, the end face of flange to ensure four-way it is horizontal and with main pipe centerline parallel；
Step 3: welding: carrying out weld job to polishing treated main pipe and four-way；
Step 4: welding non-destructive testing；
Step 5: installation sandwich valve: removing the impurity on the flange of four-way, be placed in gasket, consolidated sandwich valve by bolt and nut
It is scheduled on the flange of four-way, and uses the higher bolt of tensile strength in the side opposite with tapping machine inclined direction；
Step 6: installation header: sandwich valve upper surface dispose positioning ring, by the header being connected, cutter, centre drill and
Tapping machine is fixed on the upper surface of sandwich valve by bolt and nut, and uses tension in the side opposite with tapping machine inclined direction
The higher bolt of intensity；The oil circuit for connecting tapping machine and hydraulic station, connects the power supply of hydraulic station；
Support with adjustable when tapping machine is tilted operation is supported below tapping machine, and is adjusted according to the tilt angle of tapping machine
The tilt angle of support；
Step 7: leak test: leak test is carried out with 1.15 times of air pressure injecting compressed air of pipe design pressure,
Record pump meter reading, checks whether four-way part, sandwich valve, header, tapping machine, weld seam have leakage, after sixty minutes control reading,
Reading if any leakage, takes corresponding measure to exclude, then carry out leak test without qualification is fallen to, and is allowed for access down after qualified
One procedure；
Step 8: the disconnected pipe of aperture；
It wherein, further include the support with adjustable for being used to support tapping machine, aperture when tapping machine tilts operation in step 6
Support with adjustable when machine tilts operation includes bottom-up sequentially connected support base, inclined shore frame and tapping machine support
Table top；The support base includes 4 lower supporting legs being aligned two-by-two, and the lower supporting leg horizontally passes through welding channel steel and connects
It connects, the lower supporting leg is connected by first crossbar in the longitudinal direction；The inclined shore frame includes 2 be arranged successively along longitudinal direction
Upper support long leg and 2 upper support short-legs, 2 upper support long leg tip heights are identical, and 2 above support short-leg tip height phase
Together, the support long leg is connected with corresponding support short-leg by second crossbar respectively, the both ends of the tapping machine supporting bable tops
It is connected respectively with the top on the top of the support long leg and the support short-leg；The upper support long leg, the upper support are short
The two sides of leg and the tapping machine supporting bable tops are respectively arranged with being capable of mutually matched lockpin hole；By selecting the tapping machine
The cooperation of the lockpin hole of the lockpin hole of the two sides of supporting bable tops and the upper support long leg and upper support short-leg can adjust described
The height and tilt angle of tapping machine supporting bable tops.
2. the construction method of a kind of gas pipeline with angled aperture as claimed in claim 1, which is characterized in that in step 3
In, the form of the welding of main pipe and four-way includes butt weld and to fillet weld.
3. a kind of construction method of the gas pipeline with angled aperture as described in claim 1, which is characterized in that in step 4
In, non-destructive testing specifically comprises the following steps:
1), workpiece surface is pre-processed, removes the grease, iron rust, the oxide skin for adhering to magnetic powder of workpiece surface；
2) workpiece, is magnetized using yoke method, magnetizing current is selected according to standard test piece experimental result, magnetic yoke will intersect in magnetization
Magnetize same position, in order to avoid missing inspection；Poor contact when because caliber change leads to magnetization, need to fill out steel plate in caliber lower to change
Kind magnetization condition；
3) it, demagnetizes, magnetic yoke chemical industry part is left 1 meter of workpiece or more and is shut down again；
4), testing result provides evaluation report.
4. a kind of construction method of the gas pipeline with angled aperture as described in claim 1, which is characterized in that tapping machine support
Plane bed course or wedge-shaped bed course are additionally provided with above table top；The key groove of wedge-shaped bed course is 5 °.
5. a kind of construction method of the gas pipeline with angled aperture as described in claim 1, which is characterized in that in step 8
In, aperture is broken, and specific step is as follows for pipe:
1), after pass the test, the manual feed of centre drill is to contacting main pipe, counter clear, after semi shield oil cylinder contacts main pipe, counter
It is zeroed again, then the manual feed of centre drill retreats 5mm to main pipe is contacted, start generator, opens hydraulic station, opens aperture
Machine carries out aperture operation to tube body, gradually increases hydraulic station output pressure, controls the slow feed of flow, avoids cutter impaired, hair
Raw abnormal sound answers hard stop inspection；
2), when cutting stroke data representation to rated value, hydraulic station output pressure is unloaded pressure, and Tool in Cutting sound stops
When, as judge aperture whether main foundation in place, close hydraulic station after the completion of confirmation aperture.
6. a kind of construction method of the gas pipeline with angled aperture as described in claim 1, which is characterized in that described first is horizontal
It is provided with lockpin hole in bar and the second crossbar, by selecting the lockpin hole of the first crossbar and the lockpin hole of lower supporting leg
Cooperation and simultaneous selection described in the lockpin hole of second crossbar and the lockpin hole of corresponding upper support long leg, upper support short-leg match
It closes, the width of the support with adjustable in the longitudinal direction can be adjusted；By selecting the upper support long leg, upper support short-leg and phase
The lockpin hole of supporting leg should be descended to cooperate, the height of the tapping machine supporting bable tops can be adjusted.
7. a kind of construction method of the gas pipeline with angled aperture as claimed in claim 4, which is characterized in that in use process
In, in plane bed course or wedge-shaped bed course watering, make its moistened surface.
8. a kind of construction method of the gas pipeline with angled aperture as claimed in claim 4, which is characterized in that according to tapping machine
Actual angle of inclination in operation selects one or more plane bed courses, or the one or more wedge-shaped bed courses of selection, or selection
Plane bed course and wedge-shaped bed course are applied in combination.
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Address after: No.162 Weifang Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai, 200122 Patentee after: Shanghai Energy Construction Group Co.,Ltd. Address before: No.162 Weifang Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai, 200122 Patentee before: SHANGHAI MUNICIPAL GAS NO.2 PIPELINES ENGINEERING Co.,Ltd. |
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