CN110645418B - Connecting method for mounting large-diameter pipeline - Google Patents
Connecting method for mounting large-diameter pipeline Download PDFInfo
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- CN110645418B CN110645418B CN201910957635.3A CN201910957635A CN110645418B CN 110645418 B CN110645418 B CN 110645418B CN 201910957635 A CN201910957635 A CN 201910957635A CN 110645418 B CN110645418 B CN 110645418B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/12—Laying or reclaiming pipes on or under water
- F16L1/16—Laying or reclaiming pipes on or under water on the bottom
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/12—Laying or reclaiming pipes on or under water
- F16L1/20—Accessories therefor, e.g. floats, weights
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/02—Welded joints
Abstract
The technology relates to the field of pipeline installation engineering construction, in particular to a connection method for large-diameter pipeline installation, according to the characteristic that the axial stress of a large-diameter pipeline engineering pipeline is small, circumferential seams of metal steel pipe joints are fully welded into a composite joint, namely rib plates are adopted at the joints for reinforcement or local circumferential seams are welded for offsetting the influence of tension of the pipeline axial line, then the outer walls of the joints form a glass fiber reinforced plastic flexible joint by using epoxy and glass fiber cloth or carbon fiber cloth, so that the axial stress of the pipeline can be assisted, the pipeline is mainly used for seepage prevention, and the linear temperature expansion deformation requirement of the pipeline is met; under the condition that the protection of the pipeline coating is not damaged between the joint inner wall seams, the inner walls of the pipelines are filled and trimmed smoothly by adopting epoxy asphalt filling materials, so that the stress-free butt joint of the joints is completed, the composite joint connection is formed, the joint connection is formed by adopting the mode, and the capability of resisting the temperature expansion deformation in the axial direction can be enhanced.
Description
Technical Field
The technology relates to the field of pipeline installation engineering construction, in particular to a connection method for installing a large-diameter pipeline.
Background
In general, the pipeline installation and welding has a wide application range and can be used for connection of metal pipelines with various diameters; other connection modes are selected according to the pipe diameter and the requirements of disassembly and assembly, wherein the screw thread connection, the bonding connection, the thin-wall stainless steel pipe connection, the copper pipe connection, the hot melting connection and the cutting sleeve type connection are mainly used for the connection of small-diameter pipelines and special pipelines; the welded connection and the bell and spigot connection are mostly used for the connection of large-diameter pipelines; the flange connection and the groove type connection are suitable for the connection of pipelines with medium and small diameters, and are convenient to install and disassemble.
The bonding connection, the thin-wall stainless steel pipe connection, the copper pipe connection, the hot melting connection and the cutting sleeve type connection are connection modes of small-diameter special material pipelines, the construction of the pipeline is limited, the pipeline blanking and machining precision requirements are high due to the adoption of the mechanical connection mode, otherwise, the joint part is easy to leak, and the pipeline installation difficulty is increased. When the threads are connected, the threads are processed on the pipeline to damage the finished anticorrosive coating of the pipeline after leaving the factory, and the thread part has a weak section and is easy to corrode, so that the service life of the pipeline is influenced; the processing error of the screw thread and the screwing depth are enough to cause water leakage after the installation is not tightly attached; when the connector is reserved on the pipeline, the position and the orientation of the head-throwing pipe fitting are limited, and the screw thread screwing-in depth is insufficient, so that the phenomena of water seepage and the like at the connector are easy to occur. The flange connection and the groove connection have higher requirements on the processing precision of the flange and the groove, and the rubber ring cushion is easy to leak, is easy to puncture or age under a high-pressure state to generate leakage and is limited by the application range of the pipe diameter.
The large-diameter pipeline is connected by adopting a steel pipe joint and generally adopts a welding mode, and when the large-diameter water supply pipeline adopts PCCP and other materials (such as concrete pipes, rubber and plastic pipes) pipes, a bell and spigot mode is generally adopted. For the connection of the steel pipeline joint with a larger diameter, because the annular welding seam needing to be welded is longer, the construction cost of the welding seam is high, the difficulty of flaw detection is high, the adjacent welding seams simultaneously operate, the flash arc interferes and hurts the eyes of operators to influence the construction progress, and welders have to obtain corresponding qualifications, and the requirement on construction skill is high; when the PCCP and other material pipes are adopted for bell and spigot connection, the requirement on the ovality of the formed pipeline is high, otherwise, the pipeline needs to be adjusted for several times to be spliced in a butt joint test mode, the rubber water stop ring is easy to damage, and the installation difficulty is high. In addition, after the pipeline installation is finished, the bell and spigot needs to be sealed and special water stopping materials need to be poured, otherwise, the water is not qualified in water flowing and pressure testing, and reworking and reinstallation are needed.
Disclosure of Invention
In order to solve the problems of the prior art, the invention provides a connecting method for mounting a large-diameter pipeline.
In order to achieve the purpose, the invention adopts the following technical scheme: for mounting large-diameter pipes
The connecting method comprises the following steps:
1) before the pipeline is installed, planning a walking route of the pipeline, and drawing a pipeline walking route diagram;
2) according to the finally determined route scheme, the length of each line, the number and the length of the sleeves are measured on the spot, and the length of the sleeves needed by the pipeline is estimated;
3) piping according to the exposed and hidden pipeline diagrams marked by the pipeline diagram, and marking;
4) before the pipeline is installed, the pipeline and accessories are checked to see whether leakage and damage exist or not, and the pipeline is installed after the quality is ensured through testing;
5) digging a groove on a road passing through the hidden coating according to a pipeline distribution diagram, wherein the groove depth of the groove is greater than 50cm of the outer diameter of the pipe, and the groove width of the groove is greater than 50cm of the outer diameter of the pipe;
6) according to the piping diagram of each line, respectively placing a split heads bracket at the positions 50-100cm away from the two ends of the pipeline joint;
7) starting from a first line, installing a pipeline from one end to the other end until the pipeline of the line is installed;
8) the pipeline joint is positioned by adopting a method of welding positioning steel bars: welding a phi 20mm circular positioning steel bar at the joint part of the adjacent pipeline along the arc length direction in advance every 80-100cm, welding the positioning steel bar at the joint end of the pipeline with the outer wall of the pipeline by adopting single-side welding, wherein the welding length is 10cm, and 10cm is reserved to be used as a reserved steel bar head of a bell and spigot of the pipeline;
9) after the adjacent pipelines are hoisted in place, the reserved steel bar heads are fixedly connected with the adjacent pipelines in a welding way;
10) manually entering the pipeline, and performing joint filling treatment on a gap existing in the joint part by adopting an epoxy asphalt cementing material, so that the inner walls of the adjacent pipelines are smooth;
11) preparing an epoxy asphalt cementing material: according to the epoxy paste material: asphalt paste slurry: asbestos powder =100:50: 300-: diluent agent: curing agent =10:30-40:20-30, the curing agent adopts T-31, and the diluent adopts acetone;
12) before filling the epoxy asphalt cementing material, removing dirt at the filling material;
13) extruding and filling the epoxy asphalt cementing material into the gap of the joint in batches by using a lime splitting knife, and leveling;
14) filling the epoxy asphalt cementing material in the gap of the inner wall of the pipeline, and then covering a thick plastic film on the surface of the filled epoxy asphalt cementing material;
15) coating a layer of epoxy resin on the outer side wall of a joint of a pipeline, then bonding a layer of glass fiber cloth, coating a layer of epoxy resin before bonding a layer of glass fiber cloth, coating a layer of epoxy resin on the surface layer of the outermost glass fiber cloth, and sealing to form a glass fiber reinforced plastic joint with three layers of glass fiber cloth and four layers of epoxy resin, wherein the coating width of the glass fiber cloth is 20-30cm, and the glass fiber cloth is uniformly distributed on two sides of the joint of the pipeline;
16) when the glass fiber reinforced plastic joint is manufactured on the outer side of the pipeline, cleaning the surface according to the step 12) and keeping the surface clean;
17) after the pipeline is installed and the epoxy asphalt cementing material or the glass fiber reinforced plastic is solidified, carrying out water-closing test inspection according to pipeline engineering;
18) and after the pipeline installation is detected to have no leakage, carrying out submerged arc operation on the water-containing coarse sand backfilled at the lower part of the pipeline, and after the pipeline does not roll, backfilling loam layer by layer to finish the backfilling of the steel pipe and restore the road engineering.
The connecting method for mounting the large-diameter pipeline comprises the following steps: the pipeline structure manufactured by the mounting method comprises pipelines, positioning steel bars, glass fiber reinforced plastic layers, gaps and epoxy asphalt gel material layers, wherein the gaps are located between adjacent pipelines, a plurality of positioning steel bars are fixed on the outer side wall of each pipeline, one end of each positioning steel bar is arranged on the outer side wall of each pipeline on one side, the other end of each positioning steel bar is arranged on the outer side wall of each pipeline on the other side, two ends of each positioning steel bar are fixedly arranged on two sides of each gap, the epoxy asphalt gel material layers are fixedly arranged in the gaps, the glass fiber reinforced plastic layers are fixedly arranged at joints of the adjacent pipelines, and the glass fiber reinforced plastic layers.
Compared with the prior art, the invention has the beneficial effects that:
1) by optimizing the joint structure of the large-diameter pipeline, the possibility of brittle fracture caused by increase of sulfur and phosphorus ions due to welding heat influence of the steel pipeline is reduced, and the work load and the construction difficulty of joint girth welding (overhead welding is needed at the bottom of the outer wall and the upper part of the inner wall of the steel pipeline) are reduced;
2) by optimizing the joint structure of the pipe head, the cycle process time occupied by the installation, hoisting and adjustment precision requirements of the steel pipe is saved, and the stress generated at the joint part due to flat pressing (the two ends of the joint of the steel pipe are pressed by roof pressure to prevent the displacement in the welding process) and welding is reduced;
3) the welding work amount of the steel pipe installation joint is reduced, and the mutual interference and influence of the welding flash arcs of the steel pipe joint are reduced;
4) the connecting speed of the steel pipe installation joint is improved.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
Fig. 1 is a schematic front view of the present invention.
FIG. 2 is a schematic side view of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.
Referring to fig. 1-2, a method for connecting large diameter pipes includes the following steps:
1) before the pipeline 1 is installed, a walking route of the pipeline 1 is planned, a walking route diagram of the pipeline 1 is drawn, and a final route scheme is determined after relevant units are approved.
2) According to the finally determined route scheme, the length of each line, the number of sleeves and the length of each line are measured on the spot, the length of the pipes needed by the lines is estimated, and waste caused by purchasing more materials or influence on the installation process caused by lack of materials caused by purchasing less materials is avoided.
3) Piping according to the exposed and hidden pipeline diagrams marked by the pipeline diagram, and marking;
4) before the pipeline is installed, the pipeline and accessories are checked to see whether leakage, damage and other problems exist, and the pipeline is installed after the quality is ensured through testing;
5) and excavating a groove on the road which is covered and passed according to a pipeline distribution diagram, wherein the groove depth of the groove is greater than 50cm of the outer diameter of the pipe, and the groove width of the groove is greater than 50cm of the outer diameter of the pipe, so that a constructor can conveniently enter the groove to operate.
6) According to the piping diagram of each line, a split heads bracket is respectively arranged at the positions 50-100cm away from the two ends of the joint of the pipeline 1 so as to make the pipeline overhead to the foundation surface.
7) Starting from a first line, installing the pipeline 1 from one end to the other end until the pipeline of the line is installed; during installation, the processed pipeline 1 is placed on the support at the corresponding position, recheck is carried out on the position and the elevation of the pipeline 1, necessary adjustment is carried out, and after recheck is finished, joint treatment is started.
8) The joint of the pipeline 1 is positioned by adopting a method of welding positioning steel bars: a phi 20mm circular positioning steel bar 2 is welded on the joint part of the adjacent pipeline 1 in advance along the arc length direction every 80-100cm, the pipe 1 is welded on the joint end of the pipeline 1 by adopting single-side welding, the welding length is 10cm, and the reserved 10cm is used as a reserved steel bar head of a bell and spigot of the pipeline 1, so that the positioning during the installation of the adjacent steel pipes is facilitated.
9) After the adjacent pipelines 1 are hoisted in place, the reserved steel bar heads are fixedly connected with the adjacent pipelines 1 in a welding mode, and the situation that the glass fiber reinforced plastic joints are damaged by vertical stress generated due to rolling or settlement difference of the pipelines when the flexible joints of the two sections of pipelines 1 are constructed or soil is covered by backfilled buried pipes is avoided.
10) Manually enters the pipeline 1, gap filling treatment is carried out on a gap 4 existing in the joint part by adopting an epoxy asphalt cementing material, and the inner walls of the adjacent pipelines 1 are smooth;
11) preparing an epoxy asphalt cementing material: according to the epoxy paste material: asphalt paste slurry: asbestos powder =100:50: 300-: diluent agent: curing agent =10:30-40:20-30, curing agent adopts T-31, diluent adopts acetone, asbestos powder filler needs drying treatment.
12) Before filling the epoxy asphalt cementing material, removing dirt at the filling material to keep the surface clean;
13) adopting a lime splitting knife for civil construction to extrude and fill the epoxy asphalt cementing material into the gap of the joint in batches, and scraping;
14) and (3) finishing filling the epoxy asphalt cementing material in the gap 4 on the inner wall of the pipeline 1, and then covering a thick plastic film on the surface of the filled epoxy asphalt cementing material so as to ensure that the surface of the cementing material reaches a smooth effect after being cured and the plastic film is convenient to remove.
15) Forming a glass fiber reinforced plastic joint on the outer side wall of the pipeline in a three-cloth four-liquid mode: coating a layer of epoxy resin on the outer side wall of a joint of the pipeline 1, then bonding a layer of glass fiber cloth, coating a layer of epoxy resin before bonding a layer of glass fiber cloth, coating a layer of epoxy resin on the surface layer of the outermost glass fiber cloth, and sealing to form a glass fiber reinforced plastic joint with three layers of glass fiber cloth and four layers of epoxy resin, wherein the coating width of the glass fiber cloth is 20-30cm, and the glass fiber cloth is uniformly distributed on two sides of the joint of the pipeline 1;
16) when the glass fiber reinforced plastic joint is manufactured on the outer side of the pipeline 1, the surface is cleaned and kept clean according to the steps in the step 12).
17) After the pipeline 1 is installed and the epoxy asphalt cementing material or the glass fiber reinforced plastic is cured, carrying out water-closing test inspection according to pipeline engineering;
18) after the pipeline 1 is installed and is detected to have no leakage, the submerged arc operation is carried out on the water-containing coarse sand backfilled at the lower part of the pipeline 1, so that the pipeline 1 can not roll, and then loam is backfilled layer by layer to finish the backfilling of the steel pipe and recover the road engineering.
The pipeline structure manufactured by the mounting method comprises a pipeline 1, positioning steel bars 2, a glass fiber reinforced plastic layer 3, a gap 4, an epoxy asphalt cementing material layer 5, the gap 4 is located between adjacent pipelines 1, a plurality of positioning steel bars 2 are fixed on the outer side wall of the pipeline 1, one ends of the positioning steel bars 2 are arranged on the outer side wall of the pipeline 1 on one side, the other ends of the positioning steel bars 2 are arranged on the outer side wall of the pipeline 1 on the other side, the two ends of the positioning steel bars 2 are fixedly arranged on the two sides of the gap 4, the epoxy asphalt cementing material layer 5 is fixedly arranged in the gap 4, the glass fiber reinforced plastic layer 3 is fixedly arranged at the joint of the adjacent pipelines 1, and the glass fiber reinforced plastic. The glass fiber reinforced plastic layer 3 is formed by curing and molding epoxy resin and glass fiber cloth, wherein the epoxy resin: diluent agent: curing agent =10:30-40:20-30, curing agent adopts T-31, and diluent adopts acetone.
The working principle of the invention is as follows:
according to the characteristic that the axial stress of the pipeline in the large-diameter pipeline engineering is small, the circumferential weld of the metal steel pipe joint is optimized into a composite joint, namely, a rib plate (strip) is adopted at the joint for reinforcement or local circumferential weld is welded for counteracting the influence of the axial tension of the pipeline, the rib plate (strip) or local welding is used for positioning the steel pipe joint, then the outer wall of the joint forms a glass fiber reinforced plastic flexible joint by using epoxy and glass fiber cloth or carbon fiber cloth, so that the axial stress of the pipeline can be assisted, the pipeline is mainly used for preventing seepage, and the linear temperature expansion deformation requirement of the pipeline is met; under the condition that the protection of the pipeline coating is not damaged between the inner wall seams of the joints, the inner walls of the pipelines are smoothly filled and trimmed by adopting epoxy asphalt filling materials, so that the stress-free butt joint of the joints is completed, and the composite joint connection is formed. Besides welding reinforcement and connection, the nonmetal pipeline is connected by adopting the joint formed by the mode, and the capacity of resisting the temperature expansion deformation in the axial direction can be enhanced.
By adopting the pipeline connecting mode, the joint positioning can be quickly completed without adjusting the pipeline connecting direction by rotating back and forth according to the ovality of two adjacent sections of pipelines; the anti-corrosion coating of the pipeline is not damaged, and the service life of the pipeline is prolonged; the auxiliary anti-leakage and joint inspection treatment processes after the pipeline finish machining and installation can be saved. The glass fiber reinforced plastic coating joint not only has stronger bonding strength, but also has stronger anti-seepage performance, and the elastic deformation capability of the joint can meet the requirement of the pipeline on the telescopic deformation.
The technology of the patent is applied to the diversion open channel engineering of the inverse siphon engineering of the general Ji river in the coke-making city, the installation and the joint treatment of 4 steel pipes with the length of phi 2000mm and the length of 400m are completed within 7 to 8 days, the construction efficiency is improved, and the diversion and pavement restoration work goals of the inverse siphon engineering of the general Ji river in 15 days proposed by the government of the coke-making city are realized.
Epoxy asphalt cementing materials are filled between the steel pipe joints, the outer wall of the steel pipe is coated with epoxy glass fiber cloth to form the steel pipe glass fiber reinforced plastic joint, a cementing body formed by epoxy slurry and curing agents has higher compressive strength, bending strength and wear resistance, and a reinforcing steel bar connecting piece has stronger tensile strength, so that the damage to the glass fiber reinforced plastic joint caused by uneven settlement of backfill soil and uneven ground vehicle-mounted load and force transmission is prevented; the steel pipe joint adopts epoxy asphalt elastic filler, and the water stopping effect is good. When the flow guide steel pipe is dismantled after the second-stage construction of the reverse siphon project of the Puji river, the glass fiber reinforced plastic joint of the steel pipe and the epoxy asphalt elastic water stop filler are well preserved. In the process of guiding flow by matching the steel pipe with the open channel, the coke-made urban area is flooded in the inverted siphon engineering area of the general relief river by more than 1.0m above the ground elevation, so that the backfilling local settlement of the steel pipe is caused, but the joint of the steel pipe is still intact.
Engineering implementation example:
puji river inverted siphon diversion engineering:
1) engineering profile:
the reverse siphon engineering of the channel of the general relief river is located in a new village in a central station area of Jiaozhong city, province of Henan province, and is a river channel crossing building for a main channel of the central line engineering of north-south water to cross the general relief river. The distance from the coke is 200m from the southwest passage of the city, and the engineering area is communicated with the south China by a cement passage. The general Ji river is an artificially managed flood discharge and pollution discharge river channel, the starting point of an inverted siphon inlet is designed with a pile number IV 33+798.7, the end point of an outlet is designed with a pile number IV 34+131.7, the total length of a building is 333m, the horizontal projection length of a pipe body section is 200m, the pipe body transversely adopts a reinforced concrete box-shaped structure, and the size of a single hole is 6.5m multiplied by 6.75m (width multiplied by height).
A branch of a Wei river water system of a sea river basin of the Puji river flows from north to south through a coke making urban area, and the height of the ground at the intersection part of the reverse siphon of the Puji river is about 104-107 m. The reverse siphon engineering of Puji river is a building for passing through Puji river and Puji road. In order to ensure normal traffic and smooth riverway of the general relief road during the reverse siphon construction of the general relief river, the diversion project is carried out in two stages, the original riverway overflow of the general relief river is utilized in the first stage, the reverse siphon downstream pipe section of the general relief river is constructed, the open channel is utilized for diversion in the second stage, the modified road traffic vehicle is constructed after the reverse siphon project is backfilled, and the open channel is arranged on one side of the upstream of the reverse siphon across the road. Therefore, the general river water is drained to the open channel to flow over by burying the pipe below the road surface.
4 phi 2000mm steel pipes are arranged at the upstream and the downstream of the diversion open channel for diversion, each steel pipe is about 100m long, the number of steel pipe welding joints is large, the mutual interference of welding is large, the girth welding operation space is limited, and the girth welding is difficult. Meanwhile, the general economic road is used as a main road in south and north of the Jiaozhong city, has large traffic flow and is also a main road for resident travel, and for this reason, the Jiaozhong city government requires 15 days for realizing the diversion and the pavement restoration.
The construction is carried out according to the conventional processes of processing and transporting steel pipes and welding and assembling section by section, the installation and welding tasks of similar pipeline engineering are not enough to be completed within 15 days, and the recovery of road surface concrete is not mentioned. Through sufficient discussion, the steel pipe joint adopts a water stop joint mode of elastic glass fiber reinforced plastic and epoxy asphalt cementing material.
2) The steel pipe joint construction scheme and measures are as follows:
firstly, a groove for installing the diversion steel pipe is excavated, the bottom of the groove is leveled, and a steel plate split heads are arranged according to the position where the joint is to be installed and used as a support when the steel pipe is installed. And then hoisting the steel pipes one by one from one end to the other end according to the piping diagram. When the steel pipe is installed,
the steel pipe joint is positioned by adopting a method of positioning steel bars, namely, a phi 20 round steel bar is welded at the joint part of the adjacent steel pipes in advance along the arc length direction every 80-100cm, the steel pipe joint end is welded with the outer wall of the steel pipe by adopting single-side welding, the welding length is about 10cm, 10cm is reserved to be used as a bell and spigot of the section of steel pipe, the positioning is convenient when the steel pipe is installed, the reserved steel bar head is welded with the adjacent steel pipe after the adjacent steel pipe is hoisted in place, and the glass steel joint is prevented from being damaged after longitudinal stress is generated due to the difference of settlement when the two sections of steel pipes are backfill. After adjacent steel pipes are welded together through round steel bars, epoxy asphalt cementing materials are prepared to smooth gaps among steel bar heads, the outer wall of the steel pipe and the steel pipe, then epoxy and glass fiber cloth are adopted to carry out coating treatment on the outer wall of the steel pipe, a glass fiber reinforced plastic joint is formed in a three-cloth four-liquid mode, namely, before each layer of glass fiber cloth is bonded, a layer of epoxy base liquid is firstly coated, and a layer of base liquid is coated on the surface layer of the glass fiber cloth on the outermost side to carry out sealing, so that the three-cloth four-liquid glass fiber reinforced plastic joint is formed. The glass fiber cloth coating width is 20-30cm, and the glass fiber cloth coating width is uniformly distributed on two sides of the steel pipe joint; and after the treatment of the outer wall of the steel pipe joint is finished, filling and sealing off the inner wall of the steel pipe joint by adopting an epoxy asphalt elastic material.
After the four steel pipes arranged in parallel are hoisted and jointed, the lower part of the steel pipe is backfilled with water-containing coarse sand to carry out submerged arc operation, so that the steel pipe cannot roll, and then, the loam is backfilled layer by layer to complete the backfilling of the steel pipe, thereby recovering the road engineering.
3) The engineering construction effect is as follows:
the elastic expansion material is filled between the steel pipe joints, the outer wall of the steel pipe is provided with the steel pipe glass fiber reinforced plastic joint formed by the epoxy glass fiber cloth coating, a cementing body formed by epoxy slurry and a curing agent has higher compressive strength, bending strength and wear resistance, and a reinforcing steel bar connecting piece has stronger tensile strength, so that the damage to the glass fiber reinforced plastic joint caused by uneven settlement of backfill soil and uneven ground vehicle-mounted load transmission force is prevented; the steel pipe joint adopts epoxy asphalt elastic filler, and the water stopping effect is good. When the flow guide steel pipe is dismantled after the second-stage construction of the reverse siphon project of the Puji river, the glass fiber reinforced plastic joint of the steel pipe and the epoxy asphalt elastic water stop filler are well preserved. In the process of guiding flow by matching the steel pipe with the open channel, the coke-made urban area is flooded in the inverted siphon engineering area of the general relief river by more than 1.0m above the ground elevation, so that the backfilling local settlement of the steel pipe is caused, but the joint of the steel pipe is still intact.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (1)
1. A method of connecting large diameter pipe installations, comprising the steps of:
1) before the pipeline is installed, planning a walking route of the pipeline, and drawing a pipeline walking route diagram;
2) according to the finally determined route scheme, the length of each line, the number and the length of the sleeves are measured on the spot, and the length of the sleeves needed by the pipeline is estimated;
3) piping according to the exposed and hidden pipeline diagrams marked by the pipeline diagram, and marking;
4) before the pipeline is installed, the pipeline and accessories are checked to see whether leakage and damage exist or not, and the pipeline is installed after the quality is ensured through testing;
5) digging a groove on a road passing through the hidden coating according to a pipeline distribution diagram, wherein the groove depth of the groove is greater than 50cm of the outer diameter of the pipe, and the groove width of the groove is greater than 50cm of the outer diameter of the pipe;
6) according to the piping diagram of each line, respectively placing a split heads bracket at the positions 50-100cm away from the two ends of the pipeline joint;
7) starting from a first line, installing a pipeline from one end to the other end until the pipeline of the line is installed;
8) the pipeline joint is positioned by adopting a method of welding positioning steel bars: welding a phi 20mm circular positioning steel bar at the joint part of the adjacent pipeline along the arc length direction in advance every 80-100cm, welding the positioning steel bar at the joint end of the pipeline with the outer wall of the pipeline by adopting single-side welding, wherein the welding length is 10cm, and 10cm is reserved to be used as a reserved steel bar head of a bell and spigot of the pipeline;
9) after the adjacent pipelines are hoisted in place, the reserved steel bar heads are fixedly connected with the adjacent pipelines in a welding way;
10) manually entering the pipeline, and performing joint filling treatment on a gap existing in the joint part by adopting an epoxy asphalt cementing material, so that the inner walls of the adjacent pipelines are smooth;
11) preparing an epoxy asphalt cementing material: according to the epoxy paste material: asphalt paste slurry: the asbestos powder is 100:50: 300-: diluent agent: the curing agent is 10:30-40:20-30, the curing agent adopts T-31, and the diluent adopts acetone;
12) before filling the epoxy asphalt cementing material, removing dirt at the filling material;
13) extruding and filling the epoxy asphalt cementing material into the gap of the joint in batches by using a lime splitting knife, and leveling;
14) filling the epoxy asphalt cementing material in the gap of the inner wall of the pipeline, and then covering a thick plastic film on the surface of the filled epoxy asphalt cementing material;
15) coating a layer of epoxy resin on the outer side wall of a joint of a pipeline, then bonding a layer of glass fiber cloth, coating a layer of epoxy resin before bonding a layer of glass fiber cloth, coating a layer of epoxy resin on the surface layer of the outermost glass fiber cloth, and sealing to form a glass fiber reinforced plastic joint with three layers of glass fiber cloth and four layers of epoxy resin, wherein the coating width of the glass fiber cloth is 20-30cm, and the glass fiber cloth is uniformly distributed on two sides of the joint of the pipeline;
16) when the glass fiber reinforced plastic joint is manufactured on the outer side of the pipeline, cleaning the surface according to the step 12) and keeping the surface clean;
17) after the pipeline is installed and the epoxy asphalt cementing material or the glass fiber reinforced plastic is solidified, carrying out water-closing test inspection according to pipeline engineering;
18) after the pipeline installation is detected to have no leakage, carrying out submerged arc operation on the water-containing coarse sand backfilled at the lower part of the pipeline, and after the pipeline does not roll, backfilling loam layer by layer to finish the backfilling of the steel pipe and recover the road engineering;
the pipeline structure manufactured by the mounting method comprises pipelines, positioning steel bars, glass fiber reinforced plastic layers, gaps and epoxy asphalt gel material layers, wherein the gaps are located between adjacent pipelines, a plurality of positioning steel bars are fixed on the outer side wall of each pipeline, one end of each positioning steel bar is arranged on the outer side wall of each pipeline on one side, the other end of each positioning steel bar is arranged on the outer side wall of each pipeline on the other side, two ends of each positioning steel bar are fixedly arranged on two sides of each gap, the epoxy asphalt gel material layers are fixedly arranged in the gaps, the glass fiber reinforced plastic layers are fixedly arranged at joints of the adjacent pipelines, and the glass fiber reinforced plastic layers.
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| CN113278295B (en) * | 2020-02-20 | 2022-08-23 | 河北维立方科技有限公司 | Resin rubber modified asphalt, PCCP pipeline flexible joint coating method and application thereof |
| CN111987648B (en) * | 2020-08-20 | 2021-08-24 | 六安科亚信息科技有限公司 | Construction process for cable pipeline in electrical engineering |
| CN112122868B (en) * | 2020-09-07 | 2022-05-20 | 河北省盐山县电力管件有限公司 | Reinforced welding device for butt joint of steel pipes |
| CN113202173B (en) * | 2021-04-09 | 2023-03-10 | 中铁六局集团太原铁路建设有限公司 | Construction method for temporarily replacing cross-foundation-pit concrete pipe with steel pipe in deep foundation pit construction |
| CN113054595B (en) * | 2021-04-21 | 2022-07-01 | 曾勇智 | Buried glass fiber reinforced plastic cable bushing installation construction method |
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