CN115978296B - Anti-deformation construction method for electric smelting connection of large-caliber flexible pipeline - Google Patents
Anti-deformation construction method for electric smelting connection of large-caliber flexible pipeline Download PDFInfo
- Publication number
- CN115978296B CN115978296B CN202211571208.XA CN202211571208A CN115978296B CN 115978296 B CN115978296 B CN 115978296B CN 202211571208 A CN202211571208 A CN 202211571208A CN 115978296 B CN115978296 B CN 115978296B
- Authority
- CN
- China
- Prior art keywords
- pipeline
- caliber flexible
- steel sheet
- flexible pipeline
- joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010276 construction Methods 0.000 title claims abstract description 60
- 238000003723 Smelting Methods 0.000 title claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 26
- 239000004567 concrete Substances 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 60
- 239000010959 steel Substances 0.000 claims description 60
- 238000005056 compaction Methods 0.000 claims description 20
- 238000009412 basement excavation Methods 0.000 claims description 19
- 238000002844 melting Methods 0.000 claims description 18
- 230000008018 melting Effects 0.000 claims description 18
- 238000003825 pressing Methods 0.000 claims description 18
- 238000003466 welding Methods 0.000 claims description 16
- 238000007689 inspection Methods 0.000 claims description 14
- 238000009434 installation Methods 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 10
- 239000004575 stone Substances 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 210000001503 joint Anatomy 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000002689 soil Substances 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000003599 detergent Substances 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000005461 lubrication Methods 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 238000005485 electric heating Methods 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims 3
- 239000004429 Calibre Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 241000272184 Falconiformes Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Laying Of Electric Cables Or Lines Outside (AREA)
- Sewage (AREA)
Abstract
The invention relates to an electrofusion connection deformation-preventing construction method for a large-caliber flexible pipeline, which comprises the following construction steps: s1, measuring and lofting; s2, excavating a groove; s3, constructing a pipe base and installing a pipe; s4, installing an inner fastening device and an outer fastening device; s5, connecting the pipelines and removing the fastening device; s6, constructing a concrete well; s7, water closing test; s8, backfilling the pipeline; the invention adopts the mode of combining the external fastening device, the internal supporting device and the electrofusion connection construction process to carry out connection construction of the large-caliber flexible pipeline, can effectively ensure the internal and external deformation in the electrofusion 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-caliber flexible pipeline construction joint, reduce the risk of later 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 economic aspects and reduce the reworking treatment of the later 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 electrofusion connection deformation-preventing construction method for a large-caliber flexible pipeline.
Background
The water collecting pipeline for the newly built urban road adopts hard pipelines such as reinforced concrete and the like, is modified from the current urban pipeline, is influenced by traffic, excavation depth, large flow and the like, and can be constructed by adopting a large-caliber flexible pipeline to replace the original rigid pipeline.
The brittleness of the rigid pipeline is high due to the characteristics of the rigid pipeline, and the joint is easy to crack and break; the sealing performance of the hard pipeline is poor, and the joint is easy to leak water, so that secondary pollution is caused to the environment; the rigid pipeline has higher requirement on foundation treatment, the bending part is not easy to treat, the weight is large, and the matched construction tools and auxiliary equipment are more; the operation safety of the buried pipeline system is low, and the pipe maintenance needs to be thoroughly replaced.
When the flexible pipeline is loaded, the flexible pipeline can deform and move without damaging the structure; the sealing performance of the flexible pipeline is good, and underground water outside the pipeline cannot enter; the flexible pipeline has low processing requirement on the foundation, good pipeline bending property, light weight and convenient construction. The flexible pipeline connector is connected with the socket type electric melting connection by adopting the socket type rubber ring, wherein the connector of the socket type rubber ring is used for projects with the diameter of the pipeline within 500 mm. The pipeline electrofusion connection has certain advantages in the construction process that the diameter of the pipeline is 500mm, has the characteristics of small deformation, quick forming and small leakage of a pipeline joint, but along with the increase of the diameter of the pipeline, the leakage phenomenon occurs at the pipeline joint, the inner deformation and the outer deformation of the pipeline are large, and the inner deformation and the outer deformation of the pipeline are concentrated in the construction process of the pipeline electrofusion connection. Particularly, the flexible pipeline with the diameter of more than or equal to 800mm is constructed by adopting a socket type electric welding joint, and the large-caliber flexible pipeline is easy to deform in the electric welding construction process, so that water leakage and pipe blockage of the pipeline are caused (flexible backfill materials on the periphery of the pipeline enter 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 provide an electrofusion connection deformation-preventing construction method for a large-caliber flexible pipeline, which is used for reducing pipeline deformation in the electrofusion pipeline construction process, improving the leakage problem of a pipeline joint and avoiding the problems of pipeline leakage and pipe blockage.
The invention aims to accomplish the following technical scheme, and the construction method for preventing deformation of the electric fusion connection of the large-caliber flexible pipeline comprises the following steps:
s1, carrying out axial lofting of a large-caliber flexible pipeline by adopting a total station, rechecking side lines of the large-caliber flexible pipeline to form a record of measuring cross piles, determining the trench excavation depth of the large-caliber flexible pipeline construction according to the inner bottom elevation of the pipeline and the structural layer of a pipeline foundation, wherein the trench excavation depth is more than 1.5m, and adopting steel sheet piles to support and enclose the pipeline;
s2, constructing a pipeline foundation after the groove is excavated and accepted, carrying out no water operation in the pipeline foundation construction process, paving a dry large piece and a broken stone cushion layer on the current groove before the pipeline construction, constructing a sand cushion layer at the bottom of the pipeline after the paving is finished, and carrying out auxiliary setting, flattening and clapping on the sand cushion layer according to the width of the groove, wherein 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 a groove foundation and a pipe foundation is qualified, meanwhile, a bell and spigot 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 and spigot of the large-caliber flexible pipeline is installed towards the construction advancing direction, in the butt joint process of the two large-caliber flexible pipelines, a telescopic gap of about 10mm is reserved between the bell and spigot, the butt joint is completed by adopting the mutual matching of a lifting shoulder pole and a manual hoist, and the center of a pipe joint and the elevation of an inner bottom are adjusted correctly section by section;
S4, after the installation of the large-caliber flexible pipelines is completed, the outer fastening device and the inner supporting device are installed at the electric smelting joint of the two large-caliber flexible pipelines, the outer fastening device is installed firstly, one end of a ring-shaped steel sheet is fixed below the fastening joint block in a welding mode and is arranged along the pipeline joint in a circumferential direction, the other end of the ring-shaped steel sheet penetrates through a penetrating socket of the fastening joint block and is fixed on a clamping piece on the sliding block, and the diameter of the ring-shaped steel sheet is controlled through the cooperation of the fastening component and the sliding component, so that the outer peripheral wall of the electric smelting joint is fastened; then installing the inner supporting device, firstly installing the supporting ring, then installing the connecting assembly, finally connecting the supporting shaft with the connecting assembly, and carrying out inner supporting and fixing on the electric smelting joint of the two large-caliber flexible pipelines by rotating the supporting shaft;
S5, after the installation of the outer fastening device and the inner supporting device of the large-caliber flexible pipeline is completed, a power supply is connected, electric melting voltage and electric melting current are controlled to be connected through an electric thermal resistance wire in an electric melting way, the inner supporting device is fastened every 10 minutes during electric welding, 380V power supply and 20 kilowatts of power are needed for electric melting welding, when welding, polyethylene molten drops are generated until an external electric heating wire is connected, the electric melting connection of the pipeline is completed, and after cooling, the outer fastening device and the inner supporting device on the pipeline are removed;
S6, constructing a concrete well, namely firstly pouring a well bottom plate, supporting a well wall internal mold, binding well wall reinforcing steel bars, supporting a well wall external mold, pouring well wall concrete, firstly paving base slurry on a well wall concrete foundation surface, and hanging a cover plate;
S7, a water closing test, namely, taking inspection wells at two ends of a large-caliber flexible pipeline after the whole construction process as a water closing water head, filling water for 24 hours before the water closing test, fully soaking the pipeline, adding water to a standard height, observing a water level falling value, if the water level falls within a standard value within 30 minutes, passing the water closing test, and after passing the water closing test, timely pumping out inner water to remove a seal in the pipeline;
S8, backfilling and compaction are carried out layer by layer, light ramming and compaction are adopted within the range of more than the central axis of two sides of the large-caliber flexible pipeline and 0.5m of the pipe top, the height difference of compaction surfaces of two sides of the large-caliber flexible pipeline is not more than 30cm, double-row pipelines are arranged in the same groove, the foundation bottom surfaces are located on the same plane, the backfilling and compaction between the large-caliber flexible pipelines and the backfilling and compaction between the large-caliber flexible pipeline and the groove walls are carried out by symmetrical compaction, the segmented backfilling and compaction are carried out, and adjacent stubble connecting steps are stepped and rammed.
The beneficial effects of the invention are as follows: compared with the prior art, the connection construction of the large-caliber flexible pipeline is carried out by adopting the mode of combining the external fastening device with the internal supporting device and the electric smelting connection construction process, the internal deformation and the external deformation in the electric smelting construction process of the pipeline can be effectively ensured, the roundness of the pipeline and the plumpness of the pipeline joint are effectively ensured, the construction efficiency of the large-caliber flexible pipeline construction joint is improved, the risk of later leakage of the pipeline is reduced, the construction progress is effectively ensured, the waste of pipeline materials caused by the deformation of the pipeline joint can be effectively reduced in economic aspects, the reworking treatment caused by the leakage of the pipeline joint of the later pipeline is reduced, the effect of reducing cost and improving efficiency is achieved, and good economic benefit and social benefit are obtained in the use process.
In the step S1, when the groove is excavated, the construction machinery is adopted to excavate to 0.2-0.3m above the bottom of the groove, the mechanical excavation is stopped, the artificial excavation is adopted to the bottom of the groove, and the cleaning of the bottom of the groove is carried out, if an overexcavation site exists locally, the original soil or graded broken stone is required to be adopted to backfill and tamp in a layered manner, and the bottom of the electric smelting joint between each two adjacent large-caliber flexible pipelines is required to overexcavate a transverse small groove with the width of 0.5m and the depth of 0.3 m; the bottom of the groove provides stable foundation conditions in the construction of the pipeline foundation by locally existing the construction mode of the overexcavation site, and the transverse small groove is excavated to facilitate heat dissipation, reduce underground water and avoid grounding of an electrothermal fuse, so that the temperature of a welding interface is prevented from being transferred to the ground, and the welded junction 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 slidably connected with the fastening joint block 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 outer peripheral wall of the joint slot of the electric melting welding joint between two large-caliber flexible pipelines is attached through the annular steel sheet, the inner side of the steel sheet is tightly attached to the outer peripheral wall of the joint slot of the joint through the matching of the fastening assembly and the fastening joint block, and the problems of pipeline damage and leakage caused by pipeline deformation of the large-caliber flexible pipelines in the electric melting connection construction process are prevented.
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 an insertion opening for inserting the steel sheet, and the second side joint block is provided with an abutting block with a through hole; through the arrangement of the structure, construction workers can hold the whole fastening joint block through the main joint block when tightening the steel sheet, and through arranging the penetrating socket, the steel sheet can be well limited, and the steel sheet is not easy to deviate in the tightening process.
Preferably, the steel sheet fixing unit comprises a sliding block and a buckle piece for fixing the steel sheet, wherein the buckle piece is arranged on the sliding block, and the center of a bayonet of the buckle piece and the center of the penetrating hole are in the same straight line; the other end of the steel sheet can be fixed on the sliding block through the arrangement of the clamping piece, and the center of the clamping piece and the center of the penetrating socket are positioned on the same straight line, so that the guiding performance of the steel sheet is better.
Preferably, the tightening unit includes a screw passing through the through hole of the abutment block and fixed to one side of the sliding block, and a handle screwed to the screw and abutted against one end of the abutment block; the connecting end of the handle is sleeved in the through hole of the abutting block, and two handshake ends of the handle are arranged and respectively fixed on two radial sides of the connecting end; through the arrangement of the structure, in the process of rotating the handle and the screw rod, the screw rod can drive the sliding block to move and realize the tensioning of the steel sheet as the handle is abutted against one end of the abutting block; and the structure setting of handle not only is convenient for construction workman's operation, makes the position of handle obtain spacingly moreover, and stability is better in taut steel sheet in-process.
Preferably, the sliding assembly comprises a sliding rail arranged on the main joint block and sliding grooves arranged on the sliding block, wherein the two sliding rails are respectively fixed at the upper side end part and the lower side end part 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 in a sliding manner through the sliding grooves; 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 be moved 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 circular arc ring and the second circular arc ring are connected through a connecting component, two connecting components are arranged and distributed up and down along the supporting ring, and the supporting shaft is connected between the two connecting components and used for radially supporting the supporting ring; the arc-shaped support ring formed by the first arc ring and the second arc ring is used for supporting the support shaft, so that the problems of pipeline damage and leakage caused by deformation of the large-caliber flexible pipeline in the electric smelting connection construction process are solved, and meanwhile, the radial deformation of the pipe can be uniformly and accurately controlled, the installation and the disassembly are convenient, and the damage to the pipeline is avoided.
Preferably, the support shaft comprises a support main body and two support rods, one ends of the two support rods are connected to the end part of the support main body in a threaded connection mode, and the two support rods are propped open towards the support ring through rotation of the support main 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 cooperation of the second connecting through hole and the bolt assembly; the support shaft structure is arranged, so that the two support rods can be outwards spread only by twisting the support main body, and the radial support of the whole support ring is realized.
Preferably, the connecting assembly comprises a first pressing plate and a second pressing plate, and the first pressing plate and the second pressing plate are respectively positioned at two sides of the supporting ring and are fixed through a bolt assembly; five mounting through holes are formed in the first pressing plate and the second pressing plate, four mounting through holes are matched with a first connecting through hole between the first circular arc ring and the second circular arc ring, and the other mounting through hole is connected with the end part of the supporting shaft; therefore, the first arc ring and the second arc ring and the supporting shaft and the connecting assembly are more convenient to assemble and disassemble.
Drawings
Fig. 1 is a schematic view of the structure of the external fastening device of the present invention on a large caliber flexible pipeline.
Fig. 2 is a schematic view of the structure of the inner support device of the present invention on a large caliber flexible pipeline.
Fig. 3 is a schematic perspective view of the external fastening device of the present invention.
Fig. 4 is a schematic view of a part of the external fastening device of the present invention penetrated with a steel sheet.
Fig. 5 is a schematic structural view of an external fastening device of the present invention, in which a steel sheet is inserted.
Fig. 6 is a schematic perspective view of the internal 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 structural view of the connection assembly of the present invention.
The reference numerals in the drawings are respectively: 1. a large diameter flexible pipe; 2. an external fastening device; 3. an inner support device; 21. a steel sheet; 22. fastening the joint block; 23. a through socket; 24. a sliding block; 25. a clip; 26. a fastening assembly; 27. a sliding assembly; 31. a support ring; 32. a connection assembly; 33. a support shaft; 22-1, a main joint block; 22-2, a first side joint block; 22-3, a second lateral connecting block; 22-4, through holes; 22-5, abutting blocks; 26-1 steel sheet fixing units; 26-2, a tensioning unit; 26-3, a screw; 26-4, a handle; 26-5, connecting ends; 26-6, handshake end; 27-1, a sliding rail; 27-2, a chute; 31-1, a first circular arc ring; 31-2, a second circular arc ring; 31-3, a transverse face; 31-4, vertical ribs; 31-5 first connection via; 32-1, a first platen; 32-2, a second platen; 32-3, through holes; 33-1, a support body; 33-2, supporting rods; 33-3, second connection via.
Detailed Description
The invention will be described in detail below with reference to the attached drawings: the construction method of the invention comprises the following steps:
S1, carrying out axial lofting of a large-caliber flexible pipeline 1 by adopting a total station, rechecking side lines of the large-caliber flexible pipeline 1 to form a record of measuring cross piles, determining the trench excavation depth of the large-caliber flexible pipeline 1 according to the inner bottom elevation of the pipeline and the structural layer of a pipeline foundation, and adopting steel sheet piles to support and enclose the trench excavation depth of more than 1.5 m; determining a boundary line supported by the steel sheet pile according to a designed pipeline central 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, constructing a pipeline foundation after the groove is excavated and accepted, carrying out no water operation in the pipeline foundation construction process, paving a dry large piece and a broken stone cushion layer on the current groove before the pipeline construction, constructing a sand cushion layer at the bottom of the pipeline after the paving is finished, and carrying out auxiliary setting, flattening and clapping on the sand cushion layer according to the width of the groove, wherein 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 and spigot of the large-caliber flexible pipeline 1 is cleaned, a little 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 a groove, the bell and spigot 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 and spigot, the butt joint is completed by mutually matching a hoisting shoulder pole and a manual hoist, and the center of a pipe joint and the inner bottom elevation are adjusted correctly section by section; when the center and the elevation of the pipe joint are adjusted, the pipe joint must be cushioned, supporting bars are arranged on two sides of the pipe joint, rolling cannot occur, retesting is carried out on the installed pipe joint, and construction of the next working procedure can be carried out after the pipe joint is qualified;
S4, after the installation of the large-caliber flexible pipeline 1 is completed, 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 the annular steel sheet 21 is fixed below the fastening joint block 22 in a welding mode and is circumferentially arranged along the joint position of the large-caliber flexible pipeline 1, the other end of the annular steel sheet 21 passes through the penetrating opening 23 of the fastening joint block 22 and is fixed on the buckling piece 25 on the sliding block 24, and the diameter of the annular steel sheet 21 is controlled through the cooperation of the fastening component 26 and the sliding component 27, so that the outer peripheral wall of the electric melting connection position is fastened; then the inner supporting device 3 is installed, the supporting ring 31 is installed firstly, the connecting component 32 is installed later, the supporting shaft 33 is connected with the connecting component 32, and the inner supporting and fixing of the electric smelting joint of the two large-caliber flexible pipelines 1 are carried out through rotating the supporting shaft 33;
s5, after the installation of the outer fastening device 2 and the inner supporting device 3 of the large-caliber flexible pipeline 1 is completed, a power supply is connected, electric melting voltage and electric melting current are controlled to be connected through an electric thermal resistance wire, the inner supporting device 3 is fastened every 10 minutes during electric welding, 380V power supply and 20 kilowatts are needed for electric melting welding, when welding, polyethylene molten drops are generated at the position of an external heating wire, the electric melting connection of the pipeline is completed, and after cooling, the outer fastening device 2 and the inner supporting device 3 on the pipeline are removed;
S6, constructing a concrete well, namely firstly pouring a well bottom plate, supporting a well wall internal mold, binding well wall reinforcing steel bars, supporting a well wall external mold, pouring well wall concrete, firstly paving base slurry on a well wall concrete foundation surface, and hanging a cover plate;
The well wall template adopts a 15mm thick bamboo plywood, the well wall template is firmly clamped by three hawks, each corner is clamped by one, the upper and lower spacing is 50cm, and the side surface is supported by adopting a steel pipe; pouring concrete, namely pouring the concrete layer by layer, wherein each layer is not larger than 30cm, and pouring the next layer after vibrating compaction; inspection shaft chute: building cement mortar bricks for the inspection well flow grooves or adopting concrete solid bricks, and pre-mixing dry-mixed mortar to finish; straight line closing in of inspection shaft: the inspection shaft is with the prefabricated apron straight line binding off of reinforced concrete. When in installation, the reinforced concrete prefabricated cover plate must be cleaned, and the upper and lower surfaces must not be misplaced; the cover plate is symmetrically arranged on two sides when the cover plate is even, and only one deviation is allowed when the cover plate is odd; firstly paving 25mm of ready mixed mortar at the bottom of a cover plate, covering each side of a wall body of an inspection well to be more than or equal to 150mm, embedding the ready mixed mortar between the cover plate seams to form convex seams for preventing water seepage, and forming 45-degree triangular seams around the cover plate by the ready mixed mortar in a masonry mode, wherein the seam height is 5cm; treatment of reserved pipes: 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 smeared by premixed mortar at the joint of the inspection well and the connecting pipe. Thus, the construction of the concrete well is convenient, and after the construction of the large-caliber flexible pipeline 1 is completed, the concrete well can be used for convenient future maintenance and inspection.
S7, a water closing test, namely, using inspection wells at two ends of the large-caliber flexible pipeline 1 after the whole construction as a water closing water head, filling water for 24 hours before the water closing test, fully soaking the pipeline, adding water to a standard height, observing a water level falling value, if the water level falls within a standard value within 30 minutes, passing the water closing test, and timely pumping out inner water after passing the water closing test, and removing the inner sealing of the pipe;
S8, backfilling and compaction of pipelines are carried out layer by layer, light ramming and compaction are adopted within the range of 0.5m above central axes on two sides of the pipelines and the top of the pipelines, the height difference of compaction surfaces on two sides of the large-caliber flexible pipeline 1 is not more than 30cm, double-row pipelines are arranged in the same groove, the foundation bottom surfaces are located on the same plane, the backfilling and compaction between the large-caliber flexible pipelines 1 and the backfilling and compaction between the large-caliber flexible pipeline 1 and the groove walls are carried out by adopting symmetrical compaction, the segmented backfilling and compaction are carried out, and adjacent stubble connecting steps are stepped and rammed.
The single tube length of the large-caliber flexible pipeline 1 is generally 6m.
In the step S1, when the groove is excavated, the construction machinery is adopted to excavate to 0.2-0.3m above the bottom of the groove, the mechanical excavation is stopped, the artificial excavation is adopted to the bottom of the groove, and the cleaning of the bottom of the groove is carried out, if the local over-excavation site exists, the undisturbed soil or graded broken stone is required to be adopted to carry out layered backfill and tamp, and the bottom of the electric smelting joint between each two adjacent large-caliber flexible pipelines 1 is required to be over-excavated with a transverse small groove with the width of 0.5m and the depth of 0.3 m.
When the trench is excavated, if hard objects such as stone blocks and the like which are difficult to clean exist at the bottom of the trench, the hard objects and the like should be excavated, and the super-excavated part can be backfilled and tamped by adopting undisturbed soil or graded broken stone in a layered manner. The bottom of the groove cannot be soaked by water, if artificial precipitation is adopted, underground water can be excavated 50cm below the bottom of the address groove, and the super-excavated part can be replaced by natural graded sand and stones and leveled and tamped. The excavation width of the bottom of the groove meets 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). Wherein B is the excavation width (mm) of the bottom of the pipeline groove; do-outside diameter of the pipe (mm); b1-working face width (mm) on one side of the pipe; reference is made to table 5.2.3-1 for the face width on one side of the pipe. b2-when the support requirement exists, the support thickness of one side of the pipeline is 150-200mm; and b 3-casting concrete in situ or reinforcing steel bar concrete canal side template thickness (mm).
Width of working face at one side of pipeline
The fastening assembly 26 comprises a steel sheet fixing unit 26-1 and a tightening 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 in sliding connection with the fastening joint block 22 through a sliding assembly 27, and the tightening unit 26-2 is connected with the steel sheet fixing unit 26-1 and enables the steel sheet fixing unit 26-1 to tighten the steel sheet 21.
The fastening joint block 22 is U-shaped and divided into a main joint block 22-1, a first side joint block 22-2 and a second side joint block 22-3, wherein an insertion opening 23 for inserting the steel sheet 21 is arranged on the first side joint block 22-2, and the second side joint block 22-3 is provided with an abutting block 22-5 with a through hole 22-4.
The steel sheet fixing unit 26-1 includes a slider 24 and a buckle member 25 for fixing the steel sheet 21, the buckle member 25 is mounted on the slider 24, and the center of the bayonet of the buckle member 25 is on the same straight line with the center of the through-slot 23.
The tightening unit 26-2 includes a screw 26-3 and a handle 26-4, the screw 26-3 passing through the through hole of the abutment block 22-5 and being fixed to one side of the slide block 24, the handle 26-4 being screwed onto the screw 26-3 and abutting against one end of the abutment 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 grip ends 26-6 of the handle 26-4 are arranged and fixed on two radial sides of the connecting end 26-5 respectively.
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 the sliding rail 27-1 is provided with two sliding grooves and is respectively fixed at the upper end part and the lower end part of the main joint block 22-1, 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 in a sliding manner through the sliding groove 27-2.
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 component 32, the connecting component 32 is provided with two and distributed up and down along the supporting ring 31, and a supporting shaft 33 is connected between the two connecting components 32 and is used for radially supporting the supporting ring 31.
The transverse surfaces 31-3 of the first circular arc ring 31-1 and the second circular arc ring 31-2 are in contact with the inner wall of the large-caliber flexible pipeline 1, wherein the inner wall of the large-caliber flexible pipeline 1 refers to the inner wall of a joint where two large-caliber flexible pipelines 1 are required to be connected by electric smelting 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 ensured; the ends 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 hole 31-5, and the connecting component 32 is connected to the first connecting holes 31-5 of the vertical ribs 31-4; through the arrangement of the structure, the arc-shaped support ring formed by the first arc ring and the second arc ring is convenient to assemble and disassemble, and meanwhile, the contact surface between the support ring and the inner wall of the flexible pipeline is more favorable, and the stability in the support process is better.
The radian of the first circular arc ring 31-1 is larger than that of the second circular arc ring 31-2, and the ratio of the radian of the first circular arc ring 31-1 to the radian of the second circular arc ring 31-2 is 3:2; 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 back shaft of construction workman in the back shaft of being convenient for. And under the general condition, the first circular arc ring 31-1 is positioned on the bottom surface of the inner wall of the large-caliber flexible pipeline, the second circular arc ring 31-2 is positioned on the inner wall of the large-caliber flexible pipeline, and when the supporting shaft 33 supports, the stability between the supporting 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, wherein 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 spread towards the support ring 31 by rotating the support main body 33-1; the other end of the support rod 33-2 is provided with a second connection through hole 33-3, and the support shaft 33 is fixed to the connection assembly 32 by the cooperation of the second connection through hole 33-3 and the bolt assembly.
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 at 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 four mounting through holes 32-3 are matched with a 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.
The present invention is not limited to the above embodiments, and any modification of the structural design provided by the present invention, regardless of any changes in shape or material composition, should be considered as being within the scope of the present invention.
Claims (8)
1. The utility model provides a heavy-calibre flexible pipeline electrofusion connection shape construction method that preapring for an unfavorable turn of events which characterized in that: the construction method comprises the following steps:
S1, carrying out axial lofting of a large-caliber flexible pipeline (1) by adopting a total station, rechecking side lines of the large-caliber flexible pipeline (1) to form a record of measuring cross piles, determining the trench excavation depth of the large-caliber flexible pipeline (1) according to the inner bottom elevation of the pipeline and the structural layer of a pipeline foundation, and supporting and enclosing by adopting steel sheet piles, wherein the trench excavation depth is larger than 1.5 m;
s2, constructing a pipeline foundation after the groove is excavated and accepted, carrying out no water operation in the pipeline foundation construction process, paving a dry large piece and a broken stone cushion layer on the current groove before the pipeline construction, constructing a sand cushion layer at the bottom of the pipeline after the paving is finished, and carrying out auxiliary setting, flattening and clapping on the sand cushion layer according to the width of the groove, wherein 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 and spigot of the large-caliber flexible pipeline (1) is cleaned, a little detergent is smeared for lubrication, when the large-caliber flexible pipeline (1) is installed, the large-caliber flexible pipeline (1) is installed from the downstream of a groove, the bell and spigot of the large-caliber flexible pipeline (1) is installed towards the advancing direction of construction, in the abutting process of the two large-caliber flexible pipelines (1), a telescopic gap of about 10mm is reserved between the bell and spigot, the butt joint is completed by adopting the mutual matching of a hoisting shoulder pole and a manual hoist, and the center and inner bottom elevation of a pipe joint are adjusted correctly one by one;
S4, after the installation of the large-caliber flexible pipeline (1), the installation of the outer fastening device (2) and the inner supporting device (3) is carried out at the electric smelting joint of the two large-caliber flexible pipelines (1), the installation of the outer fastening device (2) is carried out firstly, one end of the annular steel sheet (21) is fixed below the fastening joint block (22) in a welding mode and is circumferentially arranged along the joint position of the large-caliber flexible pipeline (1), the other end of the annular steel sheet (21) passes through the penetrating opening (23) of the fastening joint block (22) and is fixed on the buckling piece (25) on the sliding block (24), and the diameter of the annular steel sheet (21) is controlled through the matching of the fastening component (26) and the sliding component (27), so that the outer peripheral wall of the electric smelting joint is fastened; then the inner supporting device (3) is installed, the supporting ring (31) is installed firstly, the connecting component (32) is installed later, finally the supporting shaft (33) is connected with the connecting component (32), and the inner supporting and fixing of the electric smelting joint of the two large-caliber flexible pipelines (1) are carried out through rotating the supporting shaft (33);
S5, after the installation of the outer fastening device (2) and the inner supporting device (3) of the large-caliber flexible pipeline (1) is completed, a power supply is connected, electric melting voltage and electric current are controlled to be connected through electric thermal resistance wires in an electric melting way, the inner supporting device (3) is fastened once every 10 minutes during electric welding, 380V power supply and 20 kilowatts of power are needed for electric melting welding, polyethylene molten drops are generated at the position of an external electric heating wire during welding until the electric melting connection of the pipeline is completed, 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 internal mold, binding well wall reinforcing steel bars, supporting a well wall external mold, pouring well wall concrete, firstly paving base slurry on a well wall concrete foundation surface, and hanging a cover plate;
S7, a water closing test, namely, taking inspection wells at two ends of the large-caliber flexible pipeline (1) subjected to construction as a water closing water head, filling water for 24 hours before the water closing test, fully soaking the pipeline, adding water to a standard height, observing a water level falling value, if the water level falls within a standard value within 30 minutes, passing the water closing test, and after passing the water closing test, timely pumping out inner water and removing the inner sealing of the pipe;
S8, backfilling and compaction of pipelines are carried out layer by layer, the upper part of central axes at two sides of the pipelines and the range of 0.5m of the pipe top are compacted by adopting light ramming, the height difference of compaction surfaces at two sides of the large-caliber flexible pipeline (1) is not more than 30cm, double-row pipelines are arranged in the same groove, the bottom surfaces of the foundations are positioned on the same plane, the backfilling and compaction between the large-caliber flexible pipelines (1) and the groove walls are carried out by adopting symmetrical compaction, the segmented backfilling and compaction are carried out, and adjacent stubble connecting steps are shaped and are tamped;
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 in sliding connection with the fastening joint block (22) 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 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; the first circular arc ring (31-1) and the second circular arc ring (31-2) are connected through a connecting component (32), the connecting component (32) is provided with two and distributed up and down along the supporting ring (31), and the supporting shaft (33) is connected between the two connecting components (32) and used for radially supporting the supporting ring (31).
2. The large-caliber flexible pipeline electrofusion connection deformation-preventing construction method according to claim 1, which is characterized by comprising the following steps: in the S1 step, when the groove is excavated, the construction machinery is adopted to excavate to 0.2-0.3m above the bottom of the groove, the mechanical excavation is stopped, the artificial excavation is adopted to the bottom of the groove, and the cleaning of the bottom of the groove is carried out, if the local over-excavation site exists, the undisturbed soil or graded broken stone is required to be adopted to backfill and tamp in a layered manner, and the bottom of the electric smelting joint between each two adjacent large-caliber flexible pipelines (1) is required to be over-excavated with a transverse small groove with the width of 0.5m and the depth of 0.3 m.
3. The large-caliber flexible pipeline electrofusion connection deformation-preventing construction method according to claim 1, which is characterized by comprising the following steps: the fastening joint block (22) is U-shaped and divided into a main joint block (22-1), a first side joint block (22-2) and a second side joint block (22-3), an insertion opening (23) for inserting 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 formed in the second side joint block (22-3).
4. The method for constructing the large-caliber flexible pipeline by electrofusion connection deformation prevention according to claim 3, which is characterized in that: the steel sheet fixing unit (26-1) comprises a sliding block (24) and a clamping piece (25) for fixing the steel sheet (21), the clamping piece (25) is installed on the sliding block (24), and the center of a bayonet of the clamping piece (25) and the center of the penetrating opening (23) are in the same straight line.
5. The method for constructing the large-caliber flexible pipeline by electrofusion connection deformation prevention according to claim 4, which is characterized in that: the tensioning unit (26-2) comprises a screw (26-3) and a handle (26-4), wherein the screw (26-3) penetrates through a 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 (26-3) in a threaded manner 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 handshake ends (26-6) of the handle (26-4) are arranged and fixed on two radial sides of the connecting end (26-5) respectively.
6. The method for constructing the large-caliber flexible pipeline by electrofusion connection deformation prevention according to claim 4, which is characterized in that: the sliding assembly (27) comprises sliding rails (27-1) arranged on the main joint block (22-1) and sliding grooves (27-2) arranged on the sliding block (24), the two sliding rails (27-1) are arranged and fixed at the upper side end part and the lower side end part of the main joint block (22-1) respectively, the sliding grooves (27-2) are 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 rails (27-1) in a sliding manner through the sliding grooves (27-2).
7. The large-caliber flexible pipeline electrofusion connection deformation-preventing construction method according to claim 1, which is characterized by comprising the following steps: 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 prop open towards the support ring (31) through rotation of the support main body (33-1); the other end of the supporting rod (33-2) is provided with a second connecting through hole (33-3), and the supporting shaft (33) is fixed on the connecting assembly (32) through the cooperation of the second connecting through hole (33-3) and the bolt assembly.
8. The large-caliber flexible pipeline electrofusion connection deformation-preventing construction method according to claim 1, which is characterized by comprising the following steps: 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 at 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 respectively provided with five mounting through holes (32-3), wherein four mounting through holes (32-3) are matched with a 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211571208.XA CN115978296B (en) | 2022-12-08 | 2022-12-08 | Anti-deformation construction method for electric smelting connection of large-caliber flexible pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211571208.XA CN115978296B (en) | 2022-12-08 | 2022-12-08 | Anti-deformation construction method for electric smelting connection of large-caliber flexible pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115978296A CN115978296A (en) | 2023-04-18 |
| CN115978296B true CN115978296B (en) | 2024-06-14 |
Family
ID=85969082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211571208.XA Active CN115978296B (en) | 2022-12-08 | 2022-12-08 | Anti-deformation construction method for electric smelting connection of large-caliber flexible pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115978296B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH108445A (en) * | 1996-06-25 | 1998-01-13 | Kawasaki Steel Corp | Laying method for piping |
| CN110306616A (en) * | 2019-08-02 | 2019-10-08 | 中交上海航道局有限公司 | A kind of construction method of sewage conduct |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100790547B1 (en) * | 2006-08-02 | 2008-01-02 | (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 |
| CN106402492A (en) * | 2016-10-26 | 2017-02-15 | 朱育盼 | Method and device for pipeline laying |
| CN106978843B (en) * | 2017-04-25 | 2019-11-15 | 杭州之江市政建设有限公司 | Municipal drainage pipeline construction technology |
-
2022
- 2022-12-08 CN CN202211571208.XA patent/CN115978296B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH108445A (en) * | 1996-06-25 | 1998-01-13 | Kawasaki Steel Corp | Laying method for piping |
| CN110306616A (en) * | 2019-08-02 | 2019-10-08 | 中交上海航道局有限公司 | A kind of construction method of sewage conduct |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115978296A (en) | 2023-04-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110306616B (en) | Construction method of sewage pipeline | |
| CN109611102B (en) | Construction method for cold excavation underpass overpass | |
| CN111335915B (en) | Section steel supporting structure and method for repairing damage of tunnel inverted arch crown | |
| CN102486247A (en) | Water supply and drainage pipeline repair technique adopting size film lining method | |
| CN110388531B (en) | Reinforcing structure and reinforcing method for pipeline | |
| CN104482298B (en) | HDPE (high-density polyethylene) steel-plastic composite spiral winding drainage pipe installation construction method | |
| CN103437417B (en) | Part repair structure for steel lining of drainage pipeline | |
| CN101457854A (en) | Large-diameter hot water pipe non-compensation direct-burried laying method | |
| CN105421448A (en) | Pile splicing structure and process of prefabricated pipe pile made of double-wall corrugated pipe | |
| CN115978296B (en) | Anti-deformation construction method for electric smelting connection of large-caliber flexible pipeline | |
| CN110552371A (en) | Construction method for eliminating horizontal construction joints of annular lining wall based on reverse construction method | |
| CN113700018A (en) | Open caisson construction method for large-volume pump station | |
| CN115898469A (en) | Tunnel secondary lining construction method | |
| CN112796773B (en) | Steel sleeve construction process and assembly method | |
| CN115217133A (en) | Construction process of foundation pit drainage system in coastal region | |
| CN104727275B (en) | Method for application of concrete work expansion joint vertical water sealing structure fixing element | |
| CN113374055A (en) | Construction method of buried reinforced HDPE (high-density polyethylene) spiral corrugated pipe | |
| CN103883810B (en) | A kind of steel wire mesh frame plastic composite tube and construction method | |
| CN216625250U (en) | Portable stable circumferential support device for placing power pipeline | |
| CN216973655U (en) | Ecological PC heavy-calibre drain pipe | |
| CN216041619U (en) | Half bellows mounting structure as escape canal | |
| CN217438981U (en) | Supporting type sleeve plugging structure for plugging pipe well | |
| CN110565692A (en) | construction method for steel bar and formwork of reverse construction method construction joint | |
| CN218154881U (en) | Structure for installing heat exchange tube by utilizing LNG storage tank pile foundation | |
| CN219240620U (en) | Prefabricated cable shaft of assembled lightweight 0.4kv |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |