CN115978296A - Anti-deformation construction method for electric melting connection of large-diameter flexible pipeline - Google Patents
Anti-deformation construction method for electric melting connection of large-diameter flexible pipeline Download PDFInfo
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- CN115978296A CN115978296A CN202211571208.XA CN202211571208A CN115978296A CN 115978296 A CN115978296 A CN 115978296A CN 202211571208 A CN202211571208 A CN 202211571208A CN 115978296 A CN115978296 A CN 115978296A
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- 238000002844 melting Methods 0.000 title claims abstract description 48
- 230000008018 melting Effects 0.000 title claims abstract description 48
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- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
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- 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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Abstract
The invention relates to an anti-deformation construction method for electric melting connection of a large-diameter flexible pipeline, which comprises the following construction steps: s1, measuring and lofting; s2, excavating a groove; s3, constructing a pipe foundation and installing a pipeline; s4, installing an inner fastening device and an outer fastening device; s5, connecting the pipeline and dismantling the fastening device; s6, constructing a concrete well; s7, water closing test; s8, backfilling a pipeline; the invention adopts the form of combining the outer fastening device, the inner supporting device and the electric melting connection construction process to carry out the connection construction of the large-diameter flexible pipeline, can effectively ensure the inner and outer deformation in the electric melting construction process of the pipeline, effectively ensure the roundness of the pipeline and the plumpness of the pipeline joint, improve the construction efficiency of the large-diameter flexible pipeline construction joint, reduce the risk of later-stage leakage of the pipeline, effectively ensure the construction progress, effectively reduce the waste of pipeline materials caused by the deformation of the pipeline joint in the aspect of economy, and reduce the rework treatment of the later-stage pipeline caused by the leakage of the pipeline joint.
Description
Technical Field
The invention belongs to the technical field of pipeline construction methods, and particularly relates to an electric melting connection deformation prevention construction method for a large-diameter flexible pipeline.
Background
The water collecting pipeline of the newly built urban road mainly adopts rigid pipelines such as reinforced concrete and the like, the water collecting pipeline for reforming the existing urban pipeline is influenced by traffic, excavation depth, large flow and the like, and the large-diameter flexible pipeline can be adopted to replace the original rigid pipeline for construction.
The rigid pipeline has larger brittleness and is easy to crack and break at the interface due to the characteristics of the rigid pipeline; the sealing performance of the hard pipeline is poor, and secondary pollution to the environment is caused by water leakage at the joint part; the rigid pipeline has higher requirement on basic treatment, the bent part is difficult to treat, the weight is large, and a plurality of matched construction tools and auxiliary equipment are provided; the safety of the buried pipeline system is low, and the pipe needs to be thoroughly replaced during maintenance.
When the flexible pipeline is loaded, the flexible pipeline can deform and move without damaging the structure; the flexible pipeline has good sealing performance, and water outside the pipeline cannot enter the pipeline; the flexible pipeline has low requirement on the treatment of the foundation, good pipeline bending property, light weight and convenient construction. The flexible pipeline interface adopts socket joint formula rubber circle to connect and socket joint formula electric smelting connection more, and wherein the interface of socket joint formula rubber circle is used for the project within 500mm of pipeline diameter more. The pipeline electric smelting is connected and is had certain advantage for 500mm work progress at the pipeline diameter, has that the pipeline interface warp characteristics little, that the shaping is fast, the seepage is little, nevertheless along with the increase of pipeline diameter, the phenomenon of seepage appears in pipeline joint department, and the pipeline is inside and outside warp great, and the inside and outside deformation of pipeline is concentrated in the pipeline electric smelting and is connected the work progress more. Particularly, a flexible pipeline with the diameter of more than or equal to 800mm is constructed by adopting a socket joint type electric melting joint, and the deformation of the pipeline is easy to occur in the electric melting construction process of the large-caliber flexible pipeline, so that the water leakage and pipe blockage phenomena of the pipeline are caused (the flexible backfill material at the periphery of the pipeline enters the pipeline through the deformation position of the pipeline to cause pipe blockage).
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an anti-deformation construction method for electric melting connection of a large-diameter flexible pipeline, which is used for reducing the deformation of the pipeline in the construction process of the electric melting pipeline, improving the leakage problem of a pipeline joint and avoiding the problems of pipeline leakage and pipe blockage.
The invention aims to solve the technical scheme that the deformation-preventing construction method for the electric melting connection of the large-caliber flexible pipeline comprises the following steps:
s1, performing axis lofting on a large-diameter flexible pipeline by adopting a total station, rechecking a side line of the large-diameter flexible pipeline to form a measuring cross-connecting pile record, determining the trench excavation depth of the large-diameter flexible pipeline construction according to the inner bottom elevation of the pipeline and a structural layer of a pipeline foundation, wherein the trench excavation depth is more than 1.5m, and supporting and enclosing by adopting a steel sheet pile;
s2, after the grooves are excavated and accepted, construction of the pipeline foundation can be carried out, water-free operation is carried out in the pipeline foundation construction process, a dry large piece and a broken stone cushion layer are laid on the grooves at the present situation before pipeline construction, construction of a sand cushion layer at the bottom of the pipeline can be carried out after laying is finished, the sand cushion layer is arranged, spread and compacted according to the width of the grooves, and the thickness of the sand cushion layer of the pipeline foundation is larger than 15cm;
s3, before the large-caliber flexible pipeline is installed, the large-caliber flexible pipeline is installed after the quality inspection of the groove foundation and the pipe foundation is qualified, meanwhile, a bell socket of the large-caliber flexible pipeline is cleaned, a small amount of detergent is smeared for lubrication, when the large-caliber flexible pipeline is installed, the large-caliber flexible pipeline starts from the downstream of the groove, the bell socket of the large-caliber flexible pipeline is installed towards the advancing direction of construction, in the butt joint process of the two large-caliber flexible pipelines, a telescopic gap of about 10mm is reserved between the bell sockets, the butt joint is completed by mutually matching a hoisting carrying pole and a manual hoist, and the elevations of the center and the inner bottom of the pipe joint are adjusted correctly section by section;
s4, after the large-caliber flexible pipelines are installed, installing an outer fastening device and an inner supporting device at the electric melting joint of the two large-caliber flexible pipelines, installing the outer fastening device, fixing one end of a ring-shaped steel sheet below a fastening joint block in a welding mode, and annularly arranging the steel sheet along the position of a pipeline joint, enabling the other end of the ring-shaped steel sheet to penetrate through a penetrating opening of the fastening joint block and be fixed on a buckling piece on a sliding block, and controlling the diameter of the ring-shaped steel sheet through the matching of a fastening assembly and a sliding assembly, so that the outer peripheral wall of the electric melting joint is fastened; then, mounting the inner support device, firstly mounting the support ring, then mounting the connecting assembly, finally connecting the support shaft with the connecting assembly, and fixing the inner support at the electric melting connection part of the two large-caliber flexible pipelines by rotating the support shaft;
s5, after the outer fastening device and the inner supporting device of the large-caliber flexible pipeline are installed, switching on a power supply and controlling the voltage and the current of electric melting to carry out electric melting connection on the pipeline through electric heating resistance wires, fastening the inner supporting device every 10 minutes during the electric welding, wherein the electric melting welding needs to adopt a 380V power supply and the power is 20 kilowatts, the electric melting connection of the pipeline is completed when welding is carried out until polyethylene molten drops are generated at the position of the external electric heating wires, and the outer fastening device and the inner supporting device on the pipeline are removed after cooling;
s6, constructing a concrete well, namely pouring a well bottom plate, supporting a well wall inner mold, binding well wall reinforcing steel bars, supporting a well wall outer mold, pouring well wall concrete, paving bottom grout on a well wall concrete foundation surface, and hanging a cover plate;
s7, performing a water closing test, namely filling water for 24 hours before the water closing test by using inspection wells at two ends of the whole constructed large-diameter flexible pipeline as water closing heads, fully soaking the pipeline, adding water to a standard height, observing a water level drop value, if the water level drops within a standard value within 30 minutes, determining that the water closing test is qualified, and after the water closing test is qualified, timely draining the water and removing the plug in the pipeline;
s8, backfilling the pipelines, wherein backfilling compaction is carried out layer by layer, the backfilling compaction is carried out above the central axis of the two sides of the large-diameter flexible pipeline and within 0.5m of the top of the pipeline, light tamping is adopted, the height difference of the compacted surfaces of the two sides of the large-diameter flexible pipeline is not more than 30cm, double-row pipelines are arranged in the same groove, the bottom surface of the foundation is positioned on the same plane, backfilling compaction between the large-diameter flexible pipelines and backfilling compaction between the large-diameter flexible pipeline and the groove wall are carried out symmetrically, and in real time of segmented backfilling compaction, adjacent connecting stubbles are in a step shape and are compacted.
The invention has the beneficial effects that: compared with the prior art, the connection construction of large-diameter flexible pipelines is carried out by adopting the form that outer fastening devices and inner supporting devices are combined with the electric melting connection construction process, the inner and outer deformation in the electric melting construction process of the pipelines can be effectively ensured, the roundness of the pipelines and the plumpness of pipeline joints are effectively ensured, the construction efficiency of the construction joints of the large-diameter flexible pipelines is improved, the risk of later-stage leakage of the pipelines is reduced, the construction progress is effectively ensured, the waste of pipeline materials caused by the deformation of the pipeline joints can be effectively reduced in the aspect of economy, the reworking treatment of the later-stage pipelines caused by the leakage of the pipeline joints is reduced, the cost reduction and efficiency improvement effects are achieved, and good economic and social benefits are obtained in the using process.
Preferably, in the step S1, when the trench is excavated, when the construction machine is adopted to excavate the trench to 0.2 to 0.3m above the trench bottom, the mechanical excavation is stopped, the manual excavation is adopted to the trench bottom, and the trench bottom is cleaned, if an overexcavation site exists locally, undisturbed soil or graded broken stone is required to be adopted for layer backfilling and tamping, and a small transverse trench with the width of 0.5m and the depth of 0.3m is required to be overexcavated at the bottom of the electric melting connection part between every two adjacent large-caliber flexible pipelines; the bottom of the groove provides stable foundation conditions for pipeline foundation construction through a construction mode that an overexcavation site exists locally, and the transverse small groove is excavated to facilitate heat dissipation, reduce underground water and avoid grounding of an electric heating fuse wire, so that the temperature of a welding interface is prevented from being transmitted to the ground, and a welding opening at the position can be completely fused.
Preferably, the fastening assembly comprises a steel sheet fixing unit and a tensioning unit, one end of the steel sheet is fixed on one end of the fastening joint block, the other end of the steel sheet is fixed on the steel sheet fixing unit, one side of the steel sheet fixing unit is connected with the fastening joint block in a sliding mode through a sliding assembly, and the tensioning unit is connected with the steel sheet fixing unit and enables the steel sheet fixing unit to tension the steel sheet; the steel sheet through the annular form is laminated with the periphery wall in the bell and spigot gap department of electrofusion welding between two heavy-calibre flexible line to through the cooperation of fastening components and fastening joint piece, closely laminate the periphery wall with inboard and bell and spigot gap department of steel sheet and, prevent that heavy-calibre flexible line pipeline from being out of shape at electric smelting connection work progress pipeline, causing the problem of pipeline damage, seepage.
Preferably, the fastening joint block is U-shaped and is divided into a main joint block, a first side joint block and a second side joint block, the first side joint block is provided with a penetration opening for penetrating the steel sheet, and the second side joint block is provided with a butting block with a through hole; through the arrangement of the structure, a construction worker can hold the whole fastening joint block through the main joint block when tensioning the steel sheet, and the steel sheet can be well limited through the arrangement of the inserting hole, so that the steel sheet is not easy to deviate in the tensioning process.
Preferably, the steel sheet fixing unit comprises a sliding block and a buckling piece for fixing the steel sheet, the buckling piece is installed on the sliding block, and the center of a bayonet of the buckling piece and the center of the inserting port are located on the same straight line; the other end of the steel sheet can be fixed on the sliding block by arranging the clamping piece, and the center of the clamping piece and the center of the insertion opening are in the same straight line, so that the guidance quality of the steel sheet is better.
Preferably, the tensioning unit comprises a screw rod and a handle, the screw rod penetrates through the through hole of the abutting block and is fixed with one side of the sliding block, and the handle is connected to the screw rod in a threaded mode and abuts against one end of the abutting block; the connecting end of the handle is sleeved in the through hole of the abutting block, and two handle ends of the handle are respectively fixed on two radial sides of the connecting end; through the arrangement of the structure, in the rotating process of the handle and the screw rod, the handle is abutted against one end of the abutting block, so that the screw rod can drive the sliding block to move, and the steel sheet is tensioned; and the structure setting of handle, not only the construction workman's of being convenient for operation makes the position of handle obtain spacingly moreover, and is better at taut steel sheet in-process stability.
Preferably, the sliding assembly comprises a sliding rail arranged on the main joint block and sliding grooves arranged on the sliding block, the sliding rail is provided with two sliding rails which are respectively fixed on the upper and lower end parts of the main joint block, the sliding grooves are arranged on one side of the sliding block, and the sliding block and the main joint block are fixedly connected with the sliding rail through the sliding grooves in a sliding manner; the structure is arranged, so that the sliding block can be stably and slidably connected to the main joint block, and the sliding block can move through the tensioning unit.
Preferably, the support ring comprises a first arc ring and a second arc ring, the first arc ring and the second arc ring are spliced into an arc-shaped support ring, and the cross section of the support ring is T-shaped; the first arc ring and the second arc ring are connected through connecting components, the connecting components are two and are distributed up and down along the support ring, and the support shaft is connected between the two connecting components and used for radially supporting the support ring; cross the circular-arc support ring that comprises first circular arc ring and second circular arc ring to through the support of back shaft, solve heavy-calibre flexible pipeline and warp in the electric smelting connection work progress, cause the problem of pipeline damage, seepage, simultaneously, the radial deformation of control tubular product that can be even accurate, be convenient for the installation dismantle and not lead to the damage of pipeline.
Preferably, the support shaft comprises a support body and two support rods, one ends of the two support rods are connected to the end part of the support body in a threaded connection manner, and the two support rods are supported towards the support ring through the rotation of the support body; the other end of the supporting rod is provided with a second connecting through hole, and the supporting shaft is fixed on the connecting assembly through the matching of the second connecting through hole and the bolt assembly; such a supporting shaft structure sets up for as long as twist support main part can realize that two spinal branch vaulting poles outwards strut, thereby realize the radial support to whole support ring.
Preferably, the connecting assembly comprises a first pressure plate and a second pressure plate, and the first pressure plate and the second pressure plate are respectively positioned at two sides of the support ring and fixed through bolt assemblies; the first pressing plate and the second pressing plate are respectively provided with five mounting through holes, wherein four mounting through holes are matched with the first connecting through hole between the first arc ring and the second arc ring, and the other mounting through hole is connected with the end part of the supporting shaft; make like this between first circular arc ring and the second circular arc ring, and the dismouting between back shaft and the coupling assembling is more convenient.
Drawings
Fig. 1 is a schematic structural diagram of an external fastening device of the invention on a large-caliber flexible pipeline.
Fig. 2 is a schematic structural diagram of the internal support device on a large-caliber flexible pipeline.
Fig. 3 is a perspective view of the external fastening device of the present invention.
FIG. 4 is a partial structural view of the external fastening device of the present invention through which a steel sheet is inserted.
FIG. 5 is a schematic view showing the construction of the external fastening device with steel plates inserted therethrough according to the present invention.
Fig. 6 is a schematic perspective view of the inner support device of the present invention.
Fig. 7 is a schematic view of the structure of the support ring of the present invention.
Fig. 8 is a schematic structural view of the support shaft of the present invention.
Fig. 9 is a schematic view of the construction of the connection assembly of the present invention.
The reference numbers in the figures are respectively: 1. a large-caliber flexible pipeline; 2. an outer fastening device; 3. an inner support means; 21. a steel sheet; 22. fastening a joint block; 23. inserting the socket; 24. a slider; 25. a fastener; 26. a fastening assembly; 27. a sliding assembly; 31. a support ring; 32. a connecting assembly; 33. a support shaft; 22-1, a main joint block; 22-2, a first side joint block; 22-3, a second side connecting block; 22-4, through holes; 22-5, an abutment block; 26-1 steel sheet fixing unit; 26-2, a tensioning unit; 26-3, a screw; 26-4, a handle; 26-5, a connecting end; 26-6, a handle end; 27-1, a slide rail; 27-2, a chute; 31-1, a first arc ring; 31-2, a second arc ring; 31-3, transverse plane; 31-4, vertical ribs; 31-5 first connecting vias; 32-1, a first pressure plate; 32-2, a second pressure plate; 32-3, through holes; 33-1, a support body; 33-2, a support rod; 33-3 and a second connecting through hole.
Detailed Description
The invention will be described in detail below with reference to the following drawings: the construction method comprises the following steps:
s1, performing axis lofting on a large-caliber flexible pipeline 1 by adopting a total station, rechecking a side line of the large-caliber flexible pipeline 1 to form a measuring cross-connecting pile record, determining the trench excavation depth of the construction of the large-caliber flexible pipeline 1 according to the inner bottom elevation of the pipeline and a structural layer of a pipeline foundation, wherein the trench excavation depth is more than 1.5m, and supporting and enclosing by adopting a steel sheet pile; determining a side line supported by the steel sheet pile according to the designed pipeline center line and the excavation width of the groove, wherein the excavation depth of the groove is determined according to the inner bottom elevation of the pipeline and the structural layer of the pipeline foundation;
s2, after the groove excavation acceptance is qualified, construction of a pipeline foundation can be carried out, water-free operation is carried out in the pipeline foundation construction process, a large dry-laid piece and a broken stone cushion layer are required to be laid on the current groove before the pipeline construction, construction of a sand cushion layer at the bottom of the pipeline can be carried out after laying is finished, the sand cushion layer is arranged, flattened and compacted according to the width of the groove, and the thickness of the sand cushion layer of the pipeline foundation is larger than 15cm;
s3, before the large-caliber flexible pipeline 1 is installed, the large-caliber flexible pipeline 1 is installed after the quality inspection of the groove foundation and the pipe foundation is qualified, meanwhile, a bell socket of the large-caliber flexible pipeline 1 is cleaned, a small amount of detergent is smeared for lubrication, when the large-caliber flexible pipeline 1 is installed, the large-caliber flexible pipeline 1 starts from the downstream of the groove, the bell socket of the large-caliber flexible pipeline 1 is installed towards the advancing direction of construction, in the butt joint process of the two large-caliber flexible pipelines 1, a telescopic gap of about 10mm is reserved between the bell sockets, the butt joint is completed by mutually matching a hoisting carrying pole and a manual hoist, and the center and the elevation inner bottom of the pipe joint are adjusted correctly section by section; when the center and the elevation of the pipe joint are adjusted, the pipe joint must be stably cushioned, supporting rods are arranged on two sides of the pipe joint, rolling cannot occur, the installed pipe joint needs to be retested, and construction of the next procedure can be performed after the pipe joint is qualified;
s4, after the large-caliber flexible pipelines 1 are installed, the outer fastening device 2 and the inner supporting device 3 are installed at the electric melting connection position of the two large-caliber flexible pipelines 1, the outer fastening device 2 is installed firstly, one end of a ring-shaped steel sheet 21 is fixed below a fastening joint block 22 in a welding mode and is arranged annularly along the joint position of the large-caliber flexible pipeline 1, the other end of the ring-shaped steel sheet 21 penetrates through an inserting opening 23 of the fastening joint block 22 and is fixed on a buckling piece 25 on a sliding block 24, the diameter of the ring-shaped steel sheet 21 is controlled through the matching of a fastening assembly 26 and a sliding assembly 27, and therefore the outer peripheral wall of the electric melting connection position is fastened; then, the inner support device 3 is installed, the support ring 31 is installed firstly, then the connecting assembly 32 is installed, finally the support shaft 33 is connected with the connecting assembly 32, and inner support fixing is conducted on the electric melting connection position of the two large-caliber flexible pipelines 1 through the rotation of the support shaft 33;
s5, after the outer fastening device 2 and the inner supporting device 3 of the large-caliber flexible pipeline 1 are installed, switching on a power supply and controlling the voltage and the current of electric melting to carry out electric melting connection on the pipeline through an electric heating resistance wire, fastening the inner supporting device 3 every 10 minutes during the electric welding, wherein the electric melting welding needs a 380V power supply and 20 kilowatts power, the electric melting connection of the pipeline is completed until polyethylene molten drops are generated at the position of an external electric heating wire during the welding, and the outer fastening device 2 and the inner supporting device 3 on the pipeline are removed after the cooling;
s6, constructing a concrete well, namely pouring a well bottom plate, supporting a well wall inner mold, binding well wall reinforcing steel bars, supporting a well wall outer mold, pouring well wall concrete, paving bottom grout on a well wall concrete foundation surface, and hanging a cover plate;
the well wall template is made of a bamboo plywood with the thickness of 15mm, the well wall template is firmly clamped by three hawks, one corner is clamped, the upper part and the lower part of the well wall template are spaced by 50cm, and the side surface of the well wall template is supported by a steel pipe; pouring concrete, wherein the concrete is poured in layers, each layer is not more than 30cm, and the next layer is poured after the concrete is vibrated to be dense; and (3) inspection of a well chute: the inspection well runner is built by cement mortar bricks or concrete solid bricks, and premixed dry-mixed mortar is used for plastering; linear closing of the inspection well: the inspection well is with prefabricated apron straight line binding off of reinforced concrete. When the reinforced concrete prefabricated cover plate is installed, the reinforced concrete prefabricated cover plate needs to be cleaned, and the upper surface and the lower surface of the reinforced concrete prefabricated cover plate cannot be mistakenly arranged; the cover plates are symmetrically arranged on two sides when the number of the cover plates is even, and only one cover plate is allowed to have deviation when the number of the cover plates is odd; paving 25mm of premixed mortar at the bottom of the cover plate, wherein each edge of the inspection well wall body covered by the cover plate is required to be more than or equal to 150mm, embedding the premixed mortar between the cover plate seams to form a convex seam for preventing water seepage, and masonry the premixed mortar around the cover plate to form a 45-degree triangular seam with the seam height of 5cm; and (3) processing a reserved pipe: the pipe diameter, direction and elevation of the reserved pipe on the inspection well must meet the design requirements. The reserved pipe is connected with the wall body in a flat mode, and a 45-degree triangular joint is formed at the joint of the inspection well and the connecting pipe through mortar in a plastering mode. Therefore, the construction of the concrete well is facilitated, and the maintenance and inspection in the future can be facilitated through the concrete well after the construction of the large-caliber flexible pipeline 1 is completed.
S7, a water closing test, namely, using inspection wells at two ends of the whole constructed large-diameter flexible pipeline 1 as water closing heads, filling water for 24 hours before the water closing test to fully soak the pipeline, adding water to a standard height, observing a water level drop value, if the water level drops within a standard value within 30 minutes, the water closing test is qualified, and after the water closing test is qualified, draining the water in time and removing the inner plug;
s8, backfilling the pipeline, wherein backfilling compaction is carried out layer by layer, the height difference of compaction surfaces on two sides of the pipeline is not more than 30cm, the two rows of pipelines are arranged in the same groove, the bottom surfaces of the bases are positioned on the same plane, the backfilling compaction between the large-diameter flexible pipelines 1 and the groove walls are carried out symmetrically, and in real time of segmented backfilling compaction, adjacent connecting stubbles are in a step shape and are compacted.
The single pipe length of the large-caliber flexible pipeline 1 is generally 6m.
In the step S1, when the groove is excavated, when the construction machinery is adopted to excavate the groove to be 0.2-0.3m above the groove bottom, the mechanical excavation is stopped, the groove bottom is excavated manually, the groove bottom is cleaned, if an overexcavation site exists locally, undisturbed soil or graded broken stones are required to be adopted for carrying out layered backfill and tamping, and the bottom of the electric melting connection part between every two adjacent large-caliber flexible pipelines 1 needs to be overexcavated to form a small transverse groove with the width of 0.5m and the depth of 0.3 m.
When the trench is excavated, if hard objects such as blocks and stones which are not easy to remove exist at the trench bottom, the hard objects are excavated, and the over-excavated part can be backfilled and tamped by adopting original soil or graded broken stones in a layering manner. The bottom of the groove can not be soaked by water, if artificial precipitation is adopted, the underground water can be excavated 50cm below the bottom of the groove, and the over-excavated part can be replaced by natural-grade sand and stone materials and leveled and tamped. The excavation width of the bottom of the groove is in accordance with the design requirement; when the design is not required, the calculation and determination can be carried out according to the following formula: b = Do +2 (B1 + B2+ B3). B-the excavation width (mm) of the bottom of the pipeline groove; do-outer diameter of pipe (mm); b 1-width of working surface (mm) on one side of the pipeline; reference is made to table 5.2.3-1 for the face width on one side of the tube. b 2-when the supporting requirement exists, the supporting thickness of one side of the pipeline can be 150-200mm; b3, pouring concrete or the thickness (mm) of a template at one side of the reinforced concrete pipe canal in situ.
Width of working surface at one side of pipeline
The fastening assembly 26 comprises a steel sheet fixing unit 26-1 and a tensioning unit 26-2, one end of the steel sheet 21 is fixed on one end of the fastening joint block 22, the other end of the steel sheet 21 is fixed on the steel sheet fixing unit 26-1, one side of the steel sheet fixing unit 26-1 is connected with the fastening joint block 22 in a sliding mode through a sliding assembly 27, and the tensioning unit 26-2 is connected with the steel sheet fixing unit 26-1 and enables the steel sheet fixing unit 26-1 to tension the steel sheet 21.
The fastening joint block 22 is U-shaped and is divided into a main joint block 22-1, a first side joint block 22-2 and a second side joint block 22-3, wherein the first side joint block 22-2 is provided with a penetration opening 23 for penetrating the steel sheet 21, and the second side joint block 22-3 is provided with a butt joint block 22-5 with a through hole 22-4.
The steel sheet fixing unit 26-1 comprises a sliding block 24 and a fastener 25 for fixing the steel sheet 21, wherein the fastener 25 is installed on the sliding block 24, and the center of the bayonet of the fastener 25 is in the same straight line with the center of the insertion hole 23.
The tensioning unit 26-2 comprises a screw rod 26-3 and a handle 26-4, the screw rod 26-3 penetrates through the through hole of the abutting block 22-5 and is fixed with one side of the sliding block 24, and the handle 26-4 is connected to the screw rod 26-3 in a threaded mode and abuts against one end of the abutting block 22-5; the connecting end 26-5 of the handle 26-4 is sleeved in the through hole 22-4 of the abutting block 22-5, and two handle ends 26-6 of the handle 26-4 are respectively fixed on two radial sides of the connecting end 26-5.
The sliding assembly 27 comprises a sliding rail 27-1 arranged on the main joint block 22-1 and a sliding groove 27-2 arranged on the sliding block 24, wherein two sliding rails 27-1 are arranged on the upper and lower end portions of the main joint block 22-1, respectively, the sliding groove 27-2 is arranged on one side of the sliding block 24, and the sliding block 24 and the main joint block 22-1 are fixedly connected with the sliding rail 27-1 through the sliding groove 27-2 in a sliding manner.
The support ring 31 comprises a first arc ring 31-1 and a second arc ring 31-2, the first arc ring 31-1 and the second arc ring 31-2 are spliced to form an arc-shaped support ring 31, and the cross section of the support ring 31 is T-shaped; the first arc ring 31-1 and the second arc ring 31-2 are connected by a connecting assembly 32, the connecting assembly 32 is provided with two parts and distributed up and down along the support ring 31, and a support shaft 33 is connected between the two connecting assemblies 32 and used for radially supporting the support ring 31.
The transverse surfaces 31-3 of the first circular arc ring 31-1 and the second circular arc ring 31-2 are both abutted against the inner wall of the large-caliber flexible pipeline 1, the inner wall of the large-caliber flexible pipeline 1 refers to the inner wall of a joint of the two large-caliber flexible pipelines 1 which need to be connected by electric melting construction, and the width of the transverse surface 31-3 is generally 10cm to 12cm, so that the inner wall of the joint can be effectively supported; the end parts of the vertical ribs 31-4 of the first circular arc ring 31-1 and the second circular arc ring 31-2 are respectively provided with a first connecting through hole 31-5, and the connecting assembly 32 is connected to the first connecting through hole 31-5 of the vertical rib 31-4; through the setting of above-mentioned structure, not only make circular-arc support ring easy dismounting that first circular arc ring and second circular arc ring constitute, simultaneously, more be favorable to the support ring bigger with the contact surface of the inner wall of flexible pipeline, the stability of support in-process is better.
The radian of the first arc ring 31-1 is larger than that of the second arc ring 31-2, and the ratio of the radian of the first arc ring 31-1 to the radian of the second arc ring 31-2 is 3; through the setting of above-mentioned structure, still because be connected through coupling assembling between first circular arc ring and the second circular arc ring, and coupling assembling is connected with the back shaft, through such proportion setting, the dismouting of the construction worker at the intra-annular back shaft of being convenient for. In general, the first circular ring 31-1 is located on the bottom surface of the inner wall of the large-caliber flexible pipeline, and the second circular ring 31-2 is located on the inner wall of the large-caliber flexible pipeline, so that when the support shaft 33 supports the large-caliber flexible pipeline, the stability between the support ring 31 and the inner wall of the large-caliber flexible pipeline is better.
The support shaft 33 comprises a support main body 33-1 and two support rods 33-2, one ends of the two support rods 33-2 are connected to the end part of the support main body 33-1 in a threaded connection mode, and the two support rods 33-2 are enabled to be propped open towards the support ring 31 through the rotation of the support main body 33-1; the other end of the support bar 33-2 is provided with a second connecting through hole 33-3, and the support shaft 33 is fixed on the connecting component 32 through the matching of the second connecting through hole 33-3 and the bolt component.
The connecting assembly 32 comprises a first pressing plate 32-1 and a second pressing plate 32-2, wherein the first pressing plate 32-1 and the second pressing plate 32-2 are respectively positioned at two sides of the supporting ring 31 and fixed through bolt assemblies; the first pressure plate 32-1 and the second pressure plate 32-2 are respectively provided with five mounting through holes 32-3, wherein four mounting through holes 32-3 are matched with the first connecting through hole 31-5 between the first arc ring 31-1 and the second arc ring 31-2, and the other mounting through hole 32-3 is connected with the end part of the supporting shaft 33.
The present invention is not limited to the above embodiments, and any changes in the shape or material composition, or any changes in the structural design provided by the present invention, are all modifications of the present invention, and should be considered within the scope of the present invention.
Claims (10)
1. An anti-deformation construction method for electric melting connection of a large-diameter flexible pipeline is characterized by comprising the following steps of: the construction method comprises the following steps:
s1, performing axis lofting on a large-caliber flexible pipeline (1) by adopting a total station, rechecking a side line of the large-caliber flexible pipeline (1) to form a measuring cross-connection pile record, determining the trench excavation depth of construction of the large-caliber flexible pipeline (1) according to the inner bottom elevation of the pipeline and a structural layer of a pipeline foundation, wherein the trench excavation depth is greater than 1.5m, and supporting and enclosing by adopting a steel sheet pile;
s2, after the groove excavation acceptance is qualified, construction of a pipeline foundation can be carried out, water-free operation is carried out in the pipeline foundation construction process, a large dry-laid piece and a broken stone cushion layer are required to be laid on the current groove before the pipeline construction, construction of a sand cushion layer at the bottom of the pipeline can be carried out after laying is finished, the sand cushion layer is arranged, flattened and compacted according to the width of the groove, and the thickness of the sand cushion layer of the pipeline foundation is larger than 15cm;
s3, before the large-caliber flexible pipeline (1) is installed, the large-caliber flexible pipeline (1) is installed after the quality inspection of a groove foundation and a pipe foundation is qualified, meanwhile, a bell socket of the large-caliber flexible pipeline (1) is cleaned, a small amount of detergent is smeared for lubrication, when the large-caliber flexible pipeline (1) is installed, the large-caliber flexible pipeline (1) starts from the downstream of the groove, the bell socket of the large-caliber flexible pipeline (1) is installed towards the construction advancing direction, in the butt joint process of the two large-caliber flexible pipelines (1), a telescopic gap of about 10mm is reserved between the bell sockets, a hoisting carrying pole and a manual hoist are matched with each other for butt joint completion, and the elevation of the center and the inner bottom of a pipe joint is adjusted correctly section by section;
s4, after the large-caliber flexible pipelines (1) are installed, the outer fastening device (2) and the inner supporting device (3) are installed at the electric melting connection position of the two large-caliber flexible pipelines (1), the outer fastening device (2) is installed firstly, one end of a ring-shaped steel sheet (21) is fixed below a fastening joint block (22) in a welding mode and is arranged annularly along the joint position of the large-caliber flexible pipelines (1), the other end of the ring-shaped steel sheet (21) penetrates through an inserting port (23) of the fastening joint block (22) and is fixed on a buckling piece (25) on a sliding block (24), the diameter of the ring-shaped steel sheet (21) is controlled through the matching of a fastening assembly (26) and a sliding assembly (27), and therefore the outer peripheral wall of the electric melting connection position is fastened; then, mounting the inner support device (3), firstly mounting the support ring (31), then mounting the connecting assembly (32), finally connecting the support shaft (33) with the connecting assembly (32), and fixing the inner support at the electric melting connection part of the two large-caliber flexible pipelines (1) through rotating the support shaft (33);
s5, after the outer fastening device (2) and the inner supporting device (3) of the large-caliber flexible pipeline (1) are installed, switching on a power supply and controlling the voltage and the current of electric melting to carry out electric melting connection on the pipeline through electric heating resistance wires, fastening the inner supporting device (3) every 10 minutes during electric welding, wherein the electric melting welding needs to adopt a 380V power supply and has the power of 20 kilowatts, the electric melting connection of the pipeline is completed until polyethylene molten drops are generated at the position of an external electric heating wire during welding, and the outer fastening device (2) and the inner supporting device (3) on the pipeline are removed after cooling;
s6, constructing a concrete well, namely firstly pouring a well bottom plate, supporting a well wall inner mold, binding well wall reinforcing steel bars, supporting a well wall outer mold, pouring well wall concrete, firstly paving bottom grout on a well wall concrete foundation surface, and then hanging a cover plate;
s7, performing a water closing test, namely using inspection wells at two ends of the whole constructed large-diameter flexible pipeline (1) as a water closing head, filling water for 24 hours before the water closing test to fully soak the pipeline, adding water to a standard height, observing a water level drop value, if the water level drops within a standard value within 30 minutes, determining that the water closing test is qualified, and after the water closing test is qualified, draining the water in time and removing the plug in the pipeline;
s8, backfilling the pipeline, wherein backfilling compaction is carried out layer by layer, the backfilling compaction is carried out above the central axis of the two sides of the pipeline and within 0.5m of the pipe top, light tamping is adopted for compaction, the difference of the heights of the compacted surfaces of the two sides of the large-diameter flexible pipeline (1) is not more than 30cm, double rows of pipelines are arranged in the same groove, the bottom surface of the foundation is located on the same plane, backfilling compaction between the large-diameter flexible pipelines (1) and backfilling compaction between the large-diameter flexible pipeline (1) and the groove wall are carried out symmetrically, and when segmented backfilling compaction is carried out, adjacent connecting stubbles are stepped and tamped.
2. The electric melting connection deformation preventing construction method for the large-caliber flexible pipeline according to claim 1, which is characterized in that: in the step S1, when the groove is excavated, when the construction machinery is adopted to excavate the groove to be 0.2-0.3m above the bottom of the groove, the mechanical excavation is stopped, the groove is excavated to the bottom of the groove manually, the groove bottom is cleaned, if an overexcavation site exists locally, undisturbed soil or graded broken stones are required to be adopted for layered backfilling and tamping, and the bottom of an electric melting joint between every two adjacent large-caliber flexible pipelines (1) needs to be subjected to overexcavation of a small transverse groove with the width of 0.5m and the depth of 0.3 m.
3. The large-caliber flexible pipeline electric melting connection deformation preventing construction method according to claim 1, characterized by comprising the following steps: the fastening assembly (26) comprises a steel sheet fixing unit (26-1) and a tensioning unit (26-2), one end of the steel sheet (21) is fixed to one end of the fastening joint block (22), the other end of the steel sheet (21) is fixed to the steel sheet fixing unit (26-1), one side of the steel sheet fixing unit (26-1) is connected with the fastening joint block (22) in a sliding mode through a sliding assembly (27), and the tensioning unit (26-2) is connected with the steel sheet fixing unit (26-1) and enables the steel sheet fixing unit (26-1) to tension the steel sheet (21).
4. The large-caliber flexible pipeline electric melting connection deformation preventing construction method according to claim 3, characterized in that: the fastening joint block (22) is U-shaped and is divided into a main joint block (22-1), a first side joint block (22-2) and a second side joint block (22-3), a penetrating opening (23) for penetrating the steel sheet (21) is formed in the first side joint block (22-2), and a butt joint block (22-5) with a through hole (22-4) is arranged on the second side joint block (22-3).
5. The large-caliber flexible pipeline electric melting connection deformation preventing construction method according to claim 4, characterized in that: the steel sheet fixing unit (26-1) comprises a sliding block (24) and a buckling piece (25) used for fixing the steel sheet (21), the buckling piece (25) is installed on the sliding block (24), and the center of a bayonet of the buckling piece (25) and the center of the inserting hole (23) are located on the same straight line.
6. The large-caliber flexible pipeline electric melting connection deformation preventing construction method according to claim 5, characterized in that: the tensioning unit (26-2) comprises a screw rod (26-3) and a handle (26-4), the screw rod (26-3) penetrates through the through hole of the abutting block (22-5) and is fixed with one side of the sliding block (24), and the handle (26-4) is connected to the screw rod (26-3) in a threaded mode and abuts against one end of the abutting block (22-5); the connecting end (26-5) of the handle (26-4) is sleeved in the through hole (22-4) of the abutting block (22-5), and two handle ends (26-6) of the handle (26-4) are arranged and fixed on two radial sides of the connecting end (26-5) respectively.
7. The large-caliber flexible pipeline electric melting connection deformation preventing construction method according to claim 5, characterized in that: the sliding assembly (27) comprises a sliding rail (27-1) arranged on the main joint block (22-1) and a sliding groove (27-2) arranged on the sliding block (24), the sliding rail (27-1) is provided with two sliding rails and fixed on the upper end and the lower end of the main joint block (22-1) respectively, the sliding groove (27-2) is arranged on one side of the sliding block (24), and the sliding block (24) and the main joint block (22-1) are fixedly connected with the sliding rail (27-1) through the sliding groove (27-2).
8. The large-caliber flexible pipeline electric melting connection deformation preventing construction method according to claim 1, characterized by comprising the following steps: the support ring (31) comprises a first arc ring (31-1) and a second arc ring (31-2), the first arc ring (31-1) and the second arc ring (31-2) are spliced into an arc-shaped support ring (31), and the cross section of the support ring (31) is T-shaped; first circular arc ring (31-1) with connect through coupling assembling (32) between second circular arc ring (31-2), coupling assembling (32) are equipped with two and follow support ring (31) distribute from top to bottom, back shaft (33) are connected two between coupling assembling (32) and be used for radial support ring (31).
9. The electric melting connection deformation preventing construction method for the large-caliber flexible pipeline according to claim 8, characterized in that: the supporting shaft (33) comprises a supporting main body (33-1) and two supporting rods (33-2), one ends of the two supporting rods (33-2) are connected to the end part of the supporting main body (33-1) in a threaded connection mode, and the two supporting rods (33-2) are enabled to be propped open towards the supporting ring (31) through rotation of the supporting main body (33-1); the other end of bracing piece (33-2) is equipped with second connect the via hole (33-3), through the cooperation of second connect the via hole (33-3) and bolt assembly will back shaft (33) are fixed on coupling assembling (32).
10. The electric melting connection deformation preventing construction method for the large-caliber flexible pipeline according to claim 8, characterized in that: the connecting assembly (32) comprises a first pressing plate (32-1) and a second pressing plate (32-2), and the first pressing plate (32-1) and the second pressing plate (32-2) are respectively positioned on two sides of the supporting ring (31) and fixed through bolt assemblies; the first pressing plate (32-1) and the second pressing plate (32-2) are provided with five mounting through holes (32-3), wherein the four mounting through holes (32-3) are matched with the first connecting through hole (31-5) between the first circular arc ring (31-1) and the second circular arc ring (31-2), and the other mounting through hole (32-3) is connected with the end part of the supporting shaft (33).
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| JPH108445A (en) * | 1996-06-25 | 1998-01-13 | Kawasaki Steel Corp | Laying method for piping |
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| CN106978843A (en) * | 2017-04-25 | 2017-07-25 | 杭州之江市政建设有限公司 | Municipal drainage pipeline construction technology |
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| JPH108445A (en) * | 1996-06-25 | 1998-01-13 | Kawasaki Steel Corp | Laying method for piping |
| KR20060092193A (en) * | 2006-08-02 | 2006-08-22 | (주)동양엠티 | Method for constructing propulsion base for the construction method for propulsion steelpipe |
| CN106320368A (en) * | 2016-08-21 | 2017-01-11 | 中铁四局集团有限公司 | Construction method applicable to open-excavation pipeline at compound stratum |
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