Method for joining and launching long and large-diameter pipeline

Abstract

A method for joining and launching a long and large-diameter pipeline, the joining and launching method comprising: step 1, sequentially arranging, in a spaced apart manner and from back to front on a pipeline joining platform, an assembly and welding station, an anti-corrosion station and a launching station; step 2, using a crawler crane to hoist and place a plurality of pipe joints on the assembly and welding station of the pipeline joining platform; step 3, pulling a pipeline segment (10) forwards to the anti-corrosion station by means of steel wire ropes (30) on a plurality of winches (3); step 4, respectively passing the ends of the steel wire ropes on the plurality of winches downwards in sequence around corresponding rear fixed pulleys (31) and front fixed pulleys (32), and then pulling the pipeline segment forwards to the launching station by means of the steel wire ropes on the plurality of winches; and step 5, upon high tide, pulling the pipeline segment forwards to a gentle slope by means of the steel wire ropes on the plurality of winches, and then slowly paying out the steel wire ropes on the plurality of winches so as to allow the pipeline segment to freely roll to the water along a launching slideway by means of the center of gravity. The method for joining and launching a long and large-diameter pipeline not only facilitates the joining and launching of pipelines, but can also protect the quality of pipeline finished products.

Description

Splicing and water entry method of long and large pipeline TECHNICAL FIELD

[0001] The present application relates to a splicing and water entry method of long and large pipeline. BACKGROUND

[0002] When carrying out the sea section sea discharge pipeline laying construction, due to the length of the sea section sea discharge pipeline being large, it needs to be assembled in multiple pipeline sections, that is, first, the pipe sections made in the steel pipe manufacturing factory are transported to the coast of the water area for lengthening to form each pipeline section, then each pipeline section is lowered into water by rolling, and then the floating and towing method is used to transport each pipeline section to the specified area for pipeline sinking, and finally, each pipeline section is assembled underwater to form the sea section sea discharge pipeline. If the pipeline section is not lowered into water smoothly due to unfavorable measures, the pipeline section or the pipeline section anticorrosion layer may be damaged. SUMMARY

[0003] The present application aims to overcome the defects of the prior art and provide a splicing and water entry method of long and large pipeline, which not only facilitates the splicing of the pipeline section, but also greatly improves the finished product quality protection of the pipeline section water entry and the water entry efficiency of the pipeline section.

[0004] The purpose of the present application is achieved by a splicing and water entry method of long and large pipeline, which adopts a pipeline splicing platform built on the coast and including pipeline splicing platforms parallel to the coastline in the length direction, a water entry slide, and a plurality of driving mechanisms; wherein,

[0005] The pipeline splicing platform includes a plurality of platform beams vertically arranged at intervals with the coastline; two platform beams located at the two ends of the pipeline splicing platform and a plurality of platform beams located at the middle of the pipeline splicing platform are slide platform beams; each platform beam is a single H-shaped steel; each slide platform beam is two H-shaped steels arranged at intervals; each platform beam and each slide platform beam are each supported by a row of platform steel pipe piles, and the back side of the row of platform steel pipe piles corresponding to each slide platform beam is each provided with a winch steel pipe pile, the top elevation of the winch steel pipe pile being the same as that of the platform steel pipe pile;

[0006] The water entry slide is composed of a plurality of water entry slides fixed on the mortar-cast stone slope surface and connected at the front end of the plurality of slide platform beams one by one; each water entry slide is a reinforced concrete beam with a rectangular cross section, and a gentle slope is provided between the top end of each water entry slide and the front end of the corresponding slide platform beam;

[0007] A plurality of driving mechanisms are installed between the plurality of winding machine steel pipe piles and the plurality of slide platform beams in a one-to-one correspondence; each driving mechanism comprises a winding machine installed on the winding machine steel pipe pile, a rear fixed pulley installed between the two H-shaped steels in the front part of the slide platform beam, and a front fixed pulley installed between the two H-shaped steels at the front end of the slide platform beam;

[0008] The method for splicing and launching the long and large pipeline of the application comprises the following steps:

[0009] Step one, sequentially and spacedly set the splicing and welding work station, the anticorrosion work station and the launching work station on the pipeline splicing platform from back to front, and mark the splicing and welding work station, the anticorrosion work station and the launching work station on each platform beam and slide platform beam of the pipeline splicing platform with paint;

[0010] Step two, use the crawler crane to hoist and lay a plurality of pipe sections on the splicing and welding work station of the pipeline splicing platform, and use manual operation to cooperate with the crawler crane to complete the alignment of adjacent pipe sections, splice the pipe sections into pipe sections with a length of L, then add triangular wedges to the bottom of each pipe section on both sides respectively, perform the splicing and girth welding between adjacent two pipe sections, detect the weld, and then weld a plurality of hooks corresponding to the plurality of slide platform beams on the same generatrix of the outer surface of the pipe section;

[0011] Step three, first, the ends of the steel wires on the plurality of winding machines are each wound downward through the corresponding rear fixed pulley, and then are hung on the hooks of the plurality of pipe sections in a one-to-one correspondence, then the triangular wedges placed on the splicing and welding work station are removed, and then the plurality of winding machines are synchronously started through the same control cabinet, the pipe sections are pulled and moved forward to the anticorrosion work station by the steel wires on the plurality of winding machines, then triangular wedges are added to the bottom of each pipe section on both sides respectively, and the pipe joints are subjected to anticorrosion treatment, finally, socket flanges are welded on both ends of the pipe section respectively, the two ends of the pipe section are sealed by using the flange blind plates, and the traction ropes are tied on the flange blind plates;

[0012] Step four, first, the ends of the steel wires on the plurality of winding machines are each wound downward through the corresponding rear fixed pulley and front fixed pulley in sequence, and then are hung on the hooks of the plurality of pipe sections in a one-to-one correspondence, then the triangular wedges placed on the anticorrosion work station are removed, and then the plurality of winding machines are synchronously started through the same control cabinet, the pipe sections are pulled and moved forward to the launching work station by the steel wires on the plurality of winding machines, then triangular wedges are added to the bottom of each pipe section on both sides respectively, and the pipe sections are kept on standby on the launching work station;

[0013] Step five, when the tide rises, the triangular wedge placed on the launching position is removed first, and then the rotating speed of several winches is controlled through the same control cabinet, the pipeline segments are pulled to the gentle slope between the launching slide and the pipeline splicing platform by the steel wires on the winches, then the steel wires on the winches are slowly released, so that the pipeline segments roll freely along the launching slide to the water, the pipeline segments with both ends blocked float naturally after entering the water, the end of the steel wire on the winch is naturally separated from the hook during the rolling of the pipeline segments, and finally the steel wires on the winches are retracted, and the pipeline segments in the water are towed out by the anchor boat.

[0014] The long pipeline splicing and water entering method, wherein the number of the platform steel pipe piles in each row is three, and each platform steel pipe pile is fixed with a square pile top head steel plate on the top surface.

[0015] The long pipeline splicing and water entering method, wherein the inside of each launching slide beam is respectively pre-buried with a I-shaped steel on both sides of the top surface; a beam top steel plate is arranged on the top surface of each launching slide beam and welded with the top surfaces of the upper flanges of the two I-shaped steels; a trolley limiting mechanism is further arranged on each launching slide beam, the trolley limiting mechanism comprises two side limiting plates which are respectively welded on the two side surfaces of the beam top steel plate, two blocking plates which are symmetrically welded on the exposed surfaces of the I-shaped steels near the top of the launching slide beam, and a blocking round steel which is inserted into the circular hole in the middle of the two blocking plates.

[0016] The long pipeline splicing and water entering method, wherein a slope steel pipe pile is respectively arranged at the slope foot of each launching slide beam.

[0017] The long pipeline splicing and water entering method has the following characteristics: the functions of pipeline splicing and water entering are integrated, the steel pipe piles are used as the bearing piles of the pipeline splicing platform, the launching slide beams are supported by the mortar-cast stone slope protection surface and the reinforced concrete beams have strong strength, rigidity and stability, and also have the anti-overturning stability, wind resistance and anti-skid safety, so that the pipeline segments can be conveniently spliced and launched, the pipeline segment assembly line operation can be formed, the pipeline segment precasting site occupation and construction cost are reduced, and the finished product quality protection of the pipeline segments entering the water is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a plan view of the splicing platform used in the long pipeline splicing and water entering method of the present application;

[0019] Fig. 2 is a longitudinal sectional view of the splicing platform used in the long pipeline splicing and water entering method of the present application;

[0020] Fig. 2a is a transverse sectional view of the launching slide beam in the splicing platform of the present application;

[0021] Fig. 3 is a state diagram of the second step of the method for splicing and launching the long and large pipeline according to the present application;

[0022] Fig. 4 is a state diagram of the third step of the method for splicing and launching the long and large pipeline according to the present application;

[0023] Fig. 5 is a state diagram of the fourth step of the method for splicing and launching the long and large pipeline according to the present application;

[0024] Fig. 6 is a state diagram of the fifth step of the method for splicing and launching the long and large pipeline according to the present application. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the accompanying drawings.

[0026] Referring to Figs. 1 to 6, the method for splicing and launching the long and large pipeline according to the present application employs a splicing platform built on the shore and comprising a pipeline splicing platform, a launching ramp and a plurality of driving mechanisms, wherein,

[0027] The pipeline splicing platform has a height of 1 m to 2 m and comprises a plurality of platform beams 11 spaced apart by about 18 m and arranged perpendicularly to the shoreline; two platform beams located at the two ends of the pipeline splicing platform and a plurality of platform beams located at the middle of the pipeline splicing platform serve as slide platform beams 12 (see Figs. 1 and 2); each platform beam 11 is made of a single H200x200x8x12 steel; each slide platform beam 12 is made of two H340x250x9x14 steels arranged at intervals; each platform beam 11 and each slide platform beam 12 is supported by a row of platform steel pipe piles, and each row of platform steel pipe piles is composed of three platform steel pipe piles 13 having an outer diameter of 630 mm and arranged at intervals, the three platform steel pipe piles 13 have a spacing of 4 m and 5 m, and the top surface of each platform steel pipe pile 13 is fixed with a square pile top head steel plate 130 having a size of 750 mm x 750 mm, and an enlarged foundation 13A is arranged on the ground at the front end of one of the platform steel pipe piles 13; a winch steel pipe pile 14 is arranged at the rear side (landward side) of each row of platform steel pipe piles 13 corresponding to each slide platform beam 12, and the top elevation of the winch steel pipe pile 14 is the same as that of the platform steel pipe pile 13.

[0028] The launching ramp is composed of a plurality of launching ramp beams 2, which are fixed on a mortar-paved stone slope surface 2A with a slope of 1:1.5 and are connected to the front ends (sea-facing ends) of a plurality of ramp platform beams 12 one by one; each launching ramp beam 2 is a rectangular reinforced concrete beam with a cross-sectional dimension of 600mm×800mm; a slope foot steel pipe pile 20 is arranged at the slope foot of each launching ramp beam 2; a steel I-beam 21 is embedded in the inside of each launching ramp beam 2 at both sides of the top surface; a 10mm-thick beam top steel plate 22 is welded to the top surface of the upper flange of the two steel I-beams 21 on the top surface of each launching ramp beam 2 (see Fig. 2a), and the surface of the beam top steel plate 22 is coated with butter for protection; a gentle slope is arranged between the top end of each launching ramp beam 2 and the front end of the corresponding ramp platform beam 12;

[0029] A plurality of driving mechanisms are installed one by one between the plurality of winch steel pipe piles 14 and the plurality of ramp platform beams 12; each driving mechanism comprises a winch 3 installed on the winch steel pipe pile 14, a rear fixed pulley 31 installed between the two H-shaped steels in the front part of the ramp platform beam 12, and a front fixed pulley 32 installed between the two H-shaped steels at the front end of the ramp platform beam 12.

[0030] The method for splicing and launching of the long and large pipeline of the application comprises the following steps:

[0031] Step one: sequentially and spacedly arranging a splicing and welding station, a corrosion prevention station and a launching station on the pipeline splicing platform from back to front, and marking the splicing and welding station, the corrosion prevention station and the launching station on each platform beam 11 and ramp platform beam 12 of the pipeline splicing platform with paint;

[0032] Step two: using a caterpillar crane to hoist and place twelve 20m-long pipe sections on the splicing and welding station of the pipeline splicing platform, using manual operation to cooperate with the caterpillar crane to complete the alignment of adjacent pipe sections, splicing the pipe sections into a 240m-long pipeline section 10, then adding triangular wedges 4 to the bottom of each pipe section on the splicing and welding station to prevent the pipe sections from moving, then performing splicing and girth welding between adjacent two pipe sections, detecting the weld, and then welding a plurality of hooks 1A (see Fig. 3) corresponding to the plurality of ramp platform beams 12 on the same generatrix on the outer surface of the pipeline section 10;

[0033] Step three, first, the end of the steel wire rope 30 on the number of winch 3 is respectively wound down through the corresponding back pulley 31, and then is respectively hung on the hook 1A of the number of pipeline segments 10, then the triangular wedge 4 placed on the assembly welding station is removed, the number of winch 3 is simultaneously started through the same control cabinet, the pipeline segment 10 is pulled forward by the steel wire rope 30 on the number of winch 3 to the anticorrosion station, then the triangular wedge 4 is respectively added on both sides of the bottom of the pipeline segment 10 located on the anticorrosion station, the pipeline segment 10 is prevented from moving, the anticorrosion treatment of the pipeline joint is carried out, finally the socket flange is welded on both ends of the pipeline segment 10, and the flange blind plate is used to block both ends of the pipeline segment 10, and the traction rope is tied on the flange blind plate (see Fig. 4);

[0034] Step four, first, the end of the steel wire rope 30 on the number of winch 3 is respectively wound down through the corresponding back pulley 31 and front pulley 32, and then is respectively hung on the hook of the number of pipeline segments 10, then the triangular wedge 4 placed on the anticorrosion station is removed, the number of winch 3 is simultaneously started through the same control cabinet, the pipeline segment 10 is pulled forward by the steel wire rope 30 on the number of winch 3 to the launching station, then the triangular wedge 4 is respectively added on both sides of the bottom of the pipeline segment 10 located on the launching station, the pipeline segment 10 is prevented from moving, and the pipeline segment 10 is on standby on the launching station (see Fig. 5);

[0035] Step five, when the tide rises, first, the triangular wedge 4 placed on the launching station is removed, the speed of the number of winch 3 is controlled through the same control cabinet, the pipeline segment 10 is pulled forward by the steel wire rope 30 on the number of winch 3 to the gentle slope between the launching slide and the pipeline splicing platform, then the steel wire rope 30 on the number of winch 3 is slowly released, the pipeline segment 10 is freely rolled along the launching slide (the number of launching slide beams 2) to the water according to the gravity, the pipeline segment 10 with both ends blocked naturally floats up after being immersed in the water, the end of the steel wire rope 30 on the number of winch 3 is naturally separated from the hook 1A in the process of rolling down (see Fig. 6), finally the steel wire rope 30 on the number of winch 3 is retracted, and the pipeline segment 10 in the water is towed out by the anchor boat through the traction rope.

[0036] The steel wire rope of the winch is stressed before the pipeline segment 10 rolls down, so that the steel wire rope has a certain tension, and the pipeline segment 10 can directly roll down without any external force according to the slope of the launching slide beam 2 when the pipeline segment 10 rolls down.

[0037] The above examples are only used to illustrate the present application, and are not limited to the present application. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present application, therefore all equivalent technical solutions should belong to the scope of the present application, which is limited by the claims.

Claims

1. A method for splicing and launching a long and large pipeline, comprising a pipeline splicing platform, a launching ramp and a plurality of driving mechanisms, which are built on a shore and comprise a plurality of platform beams arranged perpendicularly to the shore line, wherein the pipeline splicing platform comprises a plurality of platform beams arranged perpendicularly to the shore line, two platform beams at the two ends of the pipeline splicing platform and a plurality of platform beams arranged perpendicularly to the shore line in the middle of the pipeline splicing platform, wherein the two platform beams at the two ends of the pipeline splicing platform and the plurality of platform beams arranged perpendicularly to the shore line in the middle of the pipeline splicing platform are slide platform beams, each platform beam is a single H-shaped steel, each slide platform beam is two H-shaped steels arranged at intervals, each platform beam and each slide platform beam are each supported by a row of platform steel pipe piles, and the back side of the row of platform steel pipe piles corresponding to each slide platform beam is provided with a winch steel pipe pile, the top elevation of the winch steel pipe pile is the same as the top elevation of the platform steel pipe pile, the launching ramp is composed of a plurality of launching slide beams fixed on the mortar-paved stone slope surface and connected to the front ends of the plurality of slide platform beams one by one, each launching slide beam is a reinforced concrete beam with a rectangular cross section, and a gentle slope is arranged between the top end of each launching slide beam and the front end of the corresponding slide platform beam, the plurality of driving mechanisms are installed between the plurality of winch steel pipe piles and the plurality of slide platform beams one by one, each driving mechanism comprises a winch installed on the winch steel pipe pile, a rear fixed pulley installed between the two H-shaped steels in the front part of the slide platform beam, and a front fixed pulley installed between the two H-shaped steels at the front end of the slide platform beam, and the method comprises the following steps: Step one, sequentially and at intervals arranging a splicing and welding station, a corrosion prevention station and a launching station on the pipeline splicing platform from back to front, and marking the splicing and welding station, the corrosion prevention station and the launching station on each platform beam and slide platform beam of the pipeline splicing platform with paint; Step two, hoisting and placing a plurality of pipe sections on the splicing and welding station of the pipeline splicing platform by a crawler crane, aligning adjacent pipe sections by manual work in cooperation with the crawler crane, splicing the pipe sections into a pipe section with a length of L, then inserting triangular wedges into the bottom of each pipe section on the splicing and welding station, performing ring joint welding between adjacent pipe sections, detecting the weld, and then welding a plurality of hooks corresponding to the plurality of slide platform beams on the same generatrix of the outer surface of the pipe section; Step three, winding the end of the steel wire rope of each winch downward through the corresponding rear fixed pulley, then hanging the steel wire rope on the hooks of the plurality of pipe sections one by one, then removing the triangular wedges placed on the splicing and welding station, synchronously starting the plurality of winches through the same control cabinet, and then pulling and moving the pipe section to the corrosion prevention station by the steel wire ropes of the plurality of winches, then inserting triangular wedges into the bottom of each pipe section on the corrosion prevention station, performing corrosion prevention treatment on the pipe joint, finally welding a socket flange on each end of the pipe section, and sealing the two ends of the pipe section by a flange blind plate, and tying a towing rope on the flange blind plate. ​ ​ ​ ​ Step four, first, the end of the wire rope on the number of winches are each in turn around the corresponding back and front pulley, and then one by one corresponding to the hook on the number of pipe segments, and then remove the triangular wedge placed in the anticorrosion station, and then through the same control cabinet synchronous start the number of winches, by the wire rope on the number of winches to pull the pipe segments to the next water station, then put two triangular wedge on both sides of the bottom of the pipe segments in the water station, so that the pipe segments in the water station standby; Step five, wait until the high tide, first remove the triangular wedge placed in the water station, and then control the speed of the number of winches through the same control cabinet, by the wire rope on the number of winches to pull the pipe segments to the next water slide between the water slide and the pipe splicing platform, then slowly slide the wire rope on the number of winches, so that the pipe segments rely on the center of gravity along the water slide free rolling to the water, the pipe segments in both ends of the sealing after the natural float, the pipe segments in the rolling down, the end of the wire rope on the number of winches will naturally fall off the hook, and finally the wire rope on the number of winches, the pipe segments in the water through the tugboat drag out.

2. The method of splicing and launching a long pipe according to claim 1, wherein, The number of platform steel pipe piles in each row is three, and each platform steel pipe pile has a square pile top head steel plate fixed on the top surface thereof.

3. The method of splicing and launching a long pipe according to claim 1, wherein, The inside of each water discharge slide beam is pre-buried with an I-beam on both sides of the top surface; the top surface of each water discharge slide beam is paved with a beam top steel plate welded with the top surfaces of the upper flanges of the two I-beams; each water discharge slide beam is further provided with a trolley limiting mechanism, which comprises two side limiting plates welded on both sides of the beam top steel plate, two blocking plates symmetrically welded on the exposed surfaces of the I-beams near the top of the water discharge slide beam, and a blocking round steel inserted into the circular hole in the middle of the two blocking plates.

4. The method of splicing and launching a long pipe according to claim 1 or 3, wherein A slope steel pipe pile is arranged at the slope foot of each water discharge slide beam.

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