CN114952060B - One-time lofting mouth repairing construction process for large-caliber pipeline butt joint double-sided welding - Google Patents
One-time lofting mouth repairing construction process for large-caliber pipeline butt joint double-sided welding Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 36
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- 238000005516 engineering process Methods 0.000 claims description 3
- 238000009963 fulling Methods 0.000 claims description 3
- 238000013102 re-test Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 15
- 238000004364 calculation method Methods 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 4
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/10—Pipe-lines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a large-diameter pipeline butt joint double-sided welding one-time lofting and opening repairing construction process, and belongs to the technical field of hydraulic engineering construction. According to the large-diameter pipeline butt joint double-sided welding one-time lofting and opening repairing construction process, a large-diameter pipeline is subjected to bearing and insertion of a conversion piece, a joint is closed (a joint is closed), under the condition that auxiliary construction of professional measuring personnel is not carried out, on-site measurement is carried out only through a simple tool, measurement data are converted into lofting data through calculation, and butt joint double-sided welding construction of the large-diameter pipeline is realized; compared with a traditional pipeline butt joint double-sided welding method, the technical problems of multiple times of measurement, multiple times of lofting and opening repairing and the like in on-site closing construction are effectively solved, the process is popular and easy to understand, the practical operation is fast, the light-weight measurement use degree is high, the on-site technical operators are few, the measurement is simple, and the construction period can be effectively shortened; and one-time measurement and one-time lofting and opening repairing can be realized, on the premise of ensuring safety, the closing construction period can be shortened, the construction cost can be reduced, and good economic and social benefits can be realized.
Description
Technical Field
The invention relates to the technical field of hydraulic engineering construction, in particular to a one-time lofting and mouth repairing construction process for large-caliber pipeline butt joint double-sided welding.
Background
In the construction of water conservancy and hydropower engineering in China, large and medium-sized water diversion and diversion engineering is more, the water diversion and diversion engineering mainly comprises pump stations, tunnels, pipelines, channels and aqueducts, wherein the long-distance pressurized PCCP pipeline is most commonly used, and the PCCP pipeline butt joint double-sided welding closing process is more commonly applied to PCCP pipeline closing construction; however, the problem that the central elevation of the pipeline and the axis of the pipeline deviate due to the construction environment, the professional degree of site constructors and the like in the construction process of the large-caliber PCCP pipeline is unavoidable, and even if the deviation is within the allowable range of the specification, the deviation also has great influence on whether the pipeline can be smoothly and efficiently closed; at present, the traditional pipeline butt joint double-sided welding closing process usually depends on the field pipeline plumber experience and is equipped with professional measuring staff to carry out reciprocating measurement and correction, and the mouth opening measurement and repair before welding usually accounts for 60% -70% of the whole closing construction time, so how to economically, safely and quickly finish mouth opening measurement and repair lofting scientifically and efficiently is a key of closing construction; therefore, we propose a large-caliber pipeline butt-joint double-sided welding one-time lofting and mouth repairing construction process.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a one-time lofting and mouth repairing construction process for butt joint double-sided welding of a large-caliber pipeline.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a construction process for one-time lofting and mouth repairing of large-caliber pipeline butt joint double-sided welding comprises the following steps:
1) Installing an upstream conversion piece and a downstream conversion piece of a pipeline on a large-caliber pipeline to be welded, and adjusting the level of the conversion piece; the pipeline upstream and downstream conversion parts are required to be subjected to on-site retest and check on the basis of a design technology blueprint on the basis of pipeline bottom elevation and horizontal axis lines of the installed and laid pipelines on the upper and downstream of a closing point of the large-caliber pipeline to be welded before being installed;
2) Finding out the middle hanging wires of the upstream and downstream conversion parts and the closing joint;
3) Measuring the distance L between the center points of the upstream and downstream conversion parts and the included angle A between the pipe fitting ports of the upstream and downstream conversion parts;
4) Analyzing by using the known pipe diameter D, the distance L between the center points of the upstream and downstream conversion parts and the included angle A between the pipe fitting openings of the upstream and downstream conversion parts according to the space geometric relation analysis, analyzing by using a trigonometric function, calculating lofting data, and carrying out closed section lofting and lofting of the upstream and downstream conversion parts according to the calculated lofting data;
5) Repairing the mouth of the large-caliber pipeline to be welded after lofting, and finally hoisting and welding.
Further, the method for carrying out on-site retesting and checking on the elevation of the pipe bottom and the horizontal axis line of the installed and laid pipeline at the upstream and downstream of the closing point of the large-caliber pipeline to be welded further comprises the step of correcting a level ruler, wherein the step of correcting is as follows:
a1: placing a level bar at the opening of the conversion piece, then moving the level bar left and right until the level bubble is centered by sticking the inner wall, drawing a line on the inner wall of the pipe fitting along the level bar, marking the position of a central point, and operating the other port of the conversion piece in the same way;
A2: the marked central points of the two ports of the conversion part are connected end to end on the inner wall of the pipe fitting, then the level is placed on the connecting line, the pipe fitting is slightly adjusted up and down to center the level bubble, and the pipe fitting is fixed by backfilling the angle of tucking.
Further, the finding the intermediate links of the upstream and downstream transition pieces and the closing section includes:
B1: on the basis of marked line drawing, the upstream and downstream conversion parts slowly release the line hammer from top to bottom along the pipe fitting opening, the release length is longer than the pipe diameter D+10cm, after the line hammer is kept still and the hammer ball is stable, the line hammer slowly moves left and right along the pipe fitting opening until the line hammer just vertically passes through the center point position of the marked line drawing of the pipe fitting opening, the line hammer is kept motionless, the line hammer positions are marked on the upper and lower sides of the outer wall of the pipe fitting opening, and the marked line hammer position is spot-welded with a mark nail; the spot welding mark nail of the closing joint (the closing joint) is operated in the same way according to the spot welding mark nail method of the conversion piece;
b2: the cotton thread is adopted, and the length of the cotton thread is preferably longer than the length lc+10cm of the closing joint (the closing joint); binding the cotton thread on the upstream transition piece tag, tensioning the cotton thread, and connecting the cotton thread to the downstream transition piece tag.
Further, the measuring the distance L between the center points of the upstream and downstream switching pieces and the included angle A between the pipe fittings of the upstream and downstream switching pieces comprises:
c1: measuring and recording an included angle A between the bound cotton thread and the pipe fitting opening of the upstream and downstream conversion parts by using an angle measuring instrument;
c2: the distance L between the center points of the upstream and downstream converting members is measured along the cotton thread trend by a tape measure and recorded.
Compared with the prior art, the invention has the beneficial effects that:
The application provides a construction process for one-time lofting and repairing mouth of butt joint of large-caliber pipelines, which is characterized in that a large-caliber pipeline socket and spigot conversion piece and a closed joint (a joint) are subjected to field measurement only by simple tools (including a level bar, a cotton thread, a goniometer, a tape measure and the like) under the condition of no auxiliary construction by professional measuring staff, and measured data are converted into lofting data through calculation, so that the butt joint and double-sided welding construction of the large-caliber pipelines is realized; compared with the traditional pipeline butt joint double-sided welding method, the method effectively solves the technical problems of multiple-time measuring, multiple-time lofting, mouth repairing and the like in the field closed construction, is popular and easy to understand, has high practical operation speed, high light weight measuring use degree, few field technical operators, simple measurement and capability of effectively shortening the construction period; the method can realize one-time measurement and one-time lofting mouth repairing, shortens the closed construction period and reduces the construction cost on the premise of ensuring the safety, and is favorable for realizing good economic and social benefits.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
FIG. 1 is a schematic diagram of a large diameter pipe and an upstream and downstream socket and spigot joint conversion member;
FIG. 2 is a schematic illustration of placement of a level at the opening of the transition piece;
FIG. 3 is a schematic illustration of a level placed on a line;
FIG. 4 is a schematic view of marking plumb positions on and off the outer wall of a pipe orifice, spot welding a tack in the marked plumb positions;
FIG. 5 is a front view of a closed joint repair loft;
FIG. 6 is a top view of a closed joint repair loft;
fig. 7 is a top view of a repair layout of the upstream and downstream transition pieces.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The invention relates to a construction process for one-time lofting mouth repairing of large-caliber pipeline butt joint double-sided welding, which is suitable for pipeline butt joint double-sided welding closed construction such as prestressed concrete pipes (PCCP), prestressed Concrete Pipes (PCP), reinforced concrete drain pipes (RCP), prestressed steel cylinder concrete top pipes (JPCCP) and the like, is particularly suitable for pipeline pipe explosion rush repair, can save on-site closed time, improves closed construction efficiency, has obvious economic and social benefits, is mainly analyzed according to space geometric relationship, can be obtained by utilizing trigonometric function analysis (as shown in figure 1), and has the following specific formulas:
In addition, the one-time lofting mouth repairing construction process for the large-caliber pipeline butt joint double-sided welding is mainly realized by the following materials and equipment:
Table 1: main material and apparatus
| Sequence number | Name of the name | Specification (model) | Quantity of |
| 1 | Socket and spigot conversion piece | DN1400 | 2 (Cover) |
| 2 | Closing joint | DN1400 | 2 (Personal) |
| 3 | Steam hanging device | 25t | 1 (Desk) |
| 4 | Electric welding machine | 15KW | 1 (Desk) |
| 5 | Oxygen gas welding | 2 (Personal) | |
| 6 | Spade | 4 (Handle) | |
| 7 | Backfill mallet | 4 (Handle) | |
| 8 | Level ruler | DELIX/DWSP-2315 | 1 (Handle) |
| 9 | Cotton thread | 8 (Rice) | |
| 10 | Label nail | 4 (Personal) |
In one embodiment, referring to fig. 1, a construction process for one-time lofting and repairing of butt-joint double-sided welding of a large-caliber pipeline is provided, and the construction process comprises the following steps:
1) Installing an upstream conversion piece and a downstream conversion piece of a pipeline on a large-caliber pipeline to be welded, and adjusting the level of the conversion piece; on the basis of a blueprint of a design technology, on-site retesting and checking are carried out on the elevation of the pipe bottom of the pipeline installed and laid on the upper and the lower sides of a closing point of the large-caliber pipeline to be welded and the horizontal axis line of the pipeline;
In one embodiment, the on-site retesting and checking of the elevation and horizontal axis line of the pipe bottom of the installed and laid pipeline at the upper and downstream of the closing point of the large-caliber pipeline to be welded further comprises the step of leveling rule checking, wherein the step of leveling rule checking is as follows:
Placing the level bar at the opening of the conversion piece (as shown in figure 2), then moving the level bar left and right until the level bubble is centered by attaching the inner wall, drawing a line on the inner wall of the pipe fitting along the level bar, marking the position of a central point, and operating the other port of the conversion piece in the same way;
The marked central points of the two ports of the conversion piece are connected end to end on the inner wall of the pipe fitting, then the level bar is placed on a connecting line (as shown in figure 3), the pipe fitting is slightly adjusted up and down to center the level bar bubble, and the pipe fitting is fixed by backfilling the tucking angle.
It should be noted here that: the converter mounting tolerances should meet standard tolerances, with specific tolerances ranges given in the following table:
Table 2: pipe laying allowance (mm)
2) Finding out the middle hanging wire of the upstream and downstream conversion parts and the closing joint;
In one embodiment, locating the intermediate links of the upstream and downstream transition pieces and the closure node includes:
On the basis of marked line drawing, the upstream and downstream conversion parts slowly release the plumb bobs (the weights can be hung by cotton lines on site) from top to bottom along the pipe fitting mouth, the release length is longer than the pipe diameter D+10cm, after the plumb bobs are stable, the plumb bobs slowly move left and right along the pipe fitting mouth until the plumb bobs just vertically pass through the center point position of the marked line drawing of the pipe fitting mouth, the plumb bobs are kept motionless, the plumb bob positions are marked on the outer wall of the pipe fitting mouth and the plumb bob positions are marked on the marked plumb bob positions in a spot welding manner (as shown in figure 4); the spot welding mark nail of the closing joint (the closing joint) is operated in the same way according to the spot welding mark nail method of the conversion piece;
The cotton thread is adopted, and the length of the cotton thread is preferably longer than the length lc+10cm of the closing joint (the closing joint); binding the cotton thread on the upstream transition piece tag, tensioning the cotton thread, and connecting the cotton thread to the downstream transition piece tag.
3) Measuring the distance L between the center points of the upstream and downstream conversion parts and the included angle A between the pipe fitting openings of the upstream and downstream conversion parts;
in one embodiment, measuring the upstream and downstream transition piece center point distance L and the upstream and downstream transition piece pipe orifice angle a comprises:
Measuring and recording an included angle A between the bound cotton thread and the pipe fitting opening of the upstream and downstream conversion parts by using an angle measuring instrument;
the distance L between the center points of the upstream and downstream converting members is measured along the cotton thread trend by a tape measure and recorded.
4) Analyzing by using the known pipe diameter D, the distance L between the center points of the upstream and downstream conversion parts and the included angle A between the pipe fitting openings of the upstream and downstream conversion parts according to the space geometric relation analysis, analyzing by using a trigonometric function, calculating lofting data, and carrying out closed section lofting and lofting of the upstream and downstream conversion parts according to the calculated lofting data;
In one embodiment, a closed section (a compact section) is used for lofting, and one end of the closed section (the compact section) is taken as an example, and the lofting points are as follows:
Known pipe diameter D, arc length I.e.Calculation ofAccording to the calculated data, a tape measure is adopted to take a mark nail as a starting point, the calculated data value is the limit size, the outer wall of the pipe fitting is vertically and downwards measured, and the mark is marked (as shown in figure 5).
The tape measure is adopted, the mark nail is used as a starting point, the size of the lofting data X4 is used as a limit size, and the outer wall of the pipe fitting is measured along the axial direction of the pipe fitting and marked (as shown in figure 6).
The measuring tape is adopted, marking points a and e are respectively used as starting points, the values of lofting data X2 and X3 are used as limit dimensions, and the outer wall of the sticking pipe fitting is measured along the axial direction of the pipe fitting and marked (as shown in figure 6).
All marked points and marks are sequentially connected by a marker pen or chalk to form a trimming and lofting graph (as shown in figure 6);
In one embodiment, a closed section (union) loft is performed, taking an upstream transition piece as an example, the loft points are specifically as follows:
the tape measure is adopted, the mark nail is used as the starting point, and the arc length is the same as the arc length Length (arc length of closed section)Equal in value) is a limit dimension, measured along the axis of the tube against the outer wall of the tube, and marked (see fig. 7).
The tape measure is adopted, the marked point a' is used as a starting point, the size of the lofting data X1 is used as a limit size, the outer wall of the sticking pipe fitting is measured along the axial direction of the pipe fitting, and the marking is carried out (as shown in figure 7).
All marked points and marks are sequentially connected by a marker pen or chalk to form a trimming and lofting graph (as shown in figure 7);
to sum up, the operation key points are the same, and the other port of the closing joint (the union joint) and the downstream conversion piece repair and discharge drawing can be obtained.
5) Repairing the mouth of the large-caliber pipeline to be welded after lofting, and finally hoisting and welding.
According to the invention, the large-caliber pipeline socket and spigot conversion piece and the closed joint (the joint-and-joint) are subjected to field measurement, the lofting mouth repairing data is calculated by applying a summary calculation method, and the CAD software is combined to correct the data, so that one-time calculation, one-time simulation correction and one-time lofting mouth repairing are realized in closed construction, and the technical problems of multiple-time measuring, multiple-time lofting mouth repairing and the like in the field closed construction are effectively solved;
The technical problem that the measurement data of the large-caliber pipeline socket and spigot conversion piece and the closed joint (the joint) are acquired most simply is solved, the auxiliary construction of professional measuring staff is not utilized, and simple tools such as a level bar, a cotton thread, a goniometer, a tape measure and the like are adopted on site to measure related data;
the measurement data is converted into lofting data through calculation by utilizing a scientific data processing calculation formula (obtained through proof calculation) which is researched and self-determined, so that lofting is more accurate and scientific;
The large-caliber pipeline butt-joint double-sided welding one-time lofting mouth repairing construction process has the advantages of strong data acquisition and data processing practicability, simple principle and feasibility of practical operation, and can be used for the butt-joint double-sided welding construction of steel pipes with various calibers.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (2)
1. The one-time lofting mouth repairing construction process for large-caliber pipeline butt joint double-sided welding is characterized by comprising the following steps of:
1) Installing an upstream conversion piece and a downstream conversion piece of a pipeline on a large-caliber pipeline to be welded, and adjusting the level of the conversion piece; the pipeline upstream and downstream conversion parts are required to be subjected to on-site retest and check on the elevation and horizontal axis of the pipeline bottom installed and paved on the upper and downstream of the closing point of the large-caliber pipeline to be welded on the basis of a design technology blueprint before being installed;
2) Finding out the middle hanging wires of the upstream and downstream conversion parts and the closing joint;
The finding the intermediate hanger wire of the upstream and downstream switching pieces and the closing joint comprises the following steps:
B1: the upstream and downstream conversion parts slowly release the plumb from top to bottom along the pipe fitting opening on the basis of marked line drawing, the release length is greater than 10cm of the pipe diameter, after the plumb ball is stable, the plumb slowly moves left and right along the pipe fitting opening until the plumb just vertically passes through the center point position of the marked line drawing of the pipe fitting opening, the plumb is kept motionless, the plumb positions are marked on the upper and lower sides of the outer wall of the pipe fitting opening, and the mark nails are spot welded on the marked plumb positions; the closed-joint spot welding mark nail is operated in the same way according to the spot welding mark nail method of the conversion piece;
B2: cotton threads are adopted, and the length of the cotton threads is 10cm longer than the length of the closing joint; tying cotton thread on the upstream conversion element tag, tensioning the cotton thread, and connecting the cotton thread to the downstream conversion element tag;
3) Measuring the distance L between the center points of the upstream and downstream conversion parts and the included angle A between the pipe fitting ports of the upstream and downstream conversion parts;
The measuring of the distance L between the center points of the upstream and downstream conversion parts and the included angle A between the pipe fitting ports of the upstream and downstream conversion parts comprises the following steps:
c1: measuring and recording an included angle A between the bound cotton thread and the pipe fitting opening of the upstream and downstream conversion parts by using an angle measuring instrument;
C2: measuring the distance L between the center points of the upstream and downstream conversion parts along the cotton line trend by using a tape measure, and recording;
4) Analyzing by using the known pipe diameter D, the distance L between the center points of the upstream and downstream conversion parts and the included angle A between the pipe fitting openings of the upstream and downstream conversion parts according to the space geometric relation analysis, analyzing by using a trigonometric function, calculating lofting data, and carrying out closed section lofting and lofting of the upstream and downstream conversion parts according to the calculated lofting data;
5) And (3) repairing the mouth of the large-caliber pipeline to be welded after lofting, and finally hoisting and welding.
2. The construction process for double-sided welding one-time lofting and mouth repairing of large-caliber pipeline according to claim 1, wherein the on-site retesting and checking of the elevation and horizontal axis of the pipe bottom of the installed and laid pipeline at the closing point of the large-caliber pipeline to be welded and downstream, and the process further comprises the steps of:
a1: placing a level bar at the opening of the conversion piece, then moving the level bar left and right until the level bubble is centered by sticking the inner wall, drawing a line on the inner wall of the pipe fitting along the level bar, marking the position of a central point, and operating the other port of the conversion piece in the same way;
A2: the marked central points of the two ports of the conversion part are connected end to end on the inner wall of the pipe fitting, then the level is placed on the connecting line, the pipe fitting is slightly adjusted up and down to center the level bubble, and the pipe fitting is fixed by backfilling the angle of tucking.
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| CN202210676799.0A CN114952060B (en) | 2022-06-15 | 2022-06-15 | One-time lofting mouth repairing construction process for large-caliber pipeline butt joint double-sided welding |
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| CN202210676799.0A CN114952060B (en) | 2022-06-15 | 2022-06-15 | One-time lofting mouth repairing construction process for large-caliber pipeline butt joint double-sided welding |
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