A method for splicing and entering water of long and large pipes

Abstract

The present invention discloses a method for splicing and launching a long and large pipeline, comprising the following steps: step 1, arranging an assembly welding station, an anti-corrosion station, and a launching station in sequence from back to front on a pipeline splicing platform; step 2, using a crawler crane to hoist and place multiple pipe segments on the assembly welding station of the pipeline splicing platform; step 3, using steel wire ropes on several winches to pull the pipeline segments forward to the anti-corrosion station; step 4, firstly, firstly, passing the ends of the steel wire ropes on the several winches downward and in sequence around corresponding rear and front fixed pulleys, and then using the steel wire ropes on the several winches to pull the pipeline segments forward to the launching station; step 5, when the tide rises, using the steel wire ropes on the several winches to pull the pipeline segments forward to a gentle slope, and then slowly releasing the steel wire ropes on the several winches, so that the pipeline segments can roll freely along the launching platform to the water under the center of gravity. The present invention not only facilitates pipeline splicing and launching, but also protects the quality of the finished pipeline.

Description

Technical Field

[0001] The invention relates to a method for splicing and putting into water a long and large pipe. Background Art

[0002] During the installation of offshore drainage pipes, due to their long length, they need to be assembled in multiple sections. This means that the pipe sections manufactured at the steel pipe manufacturing plant must first be transported to the coast of the launch area for splicing to form each section. Each section is then launched into the water using a rolling launch method. Each section is then transported to a designated area using a floating and dragging method for sinking. Finally, the sections are assembled underwater to form the offshore drainage pipes. If inadequate measures are taken during the launch of the pipeline sections, preventing them from being smoothly launched, damage to the pipeline sections or their anti-corrosion coatings may occur. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a method for splicing and entering water of long and large pipes, which not only facilitates the splicing of pipe segments, but also greatly improves the quality protection of the finished product of the pipe segments entering water and improves the water entry efficiency of the pipe segments.

[0004] The object of the present invention is achieved as follows: a method for splicing and launching long and large pipelines, which adopts a pipeline splicing platform built on the coast and including a pipeline splicing platform with a length direction parallel to the coastline, a launching slide and several driving mechanisms; wherein,

[0005] The pipeline splicing platform includes a plurality of platform beams arranged perpendicularly to the coastline at intervals; two platform beams located at both ends of the pipeline splicing platform in a one-to-one correspondence and a plurality of platform beams located at intervals in the middle of the pipeline splicing platform are slideway platform beams; each platform beam is made of a single H-shaped steel; each slideway platform beam is made of two H-shaped steels arranged at intervals; each platform beam and each slideway platform beam is supported by a row of platform steel pipe piles, and a winch steel pipe pile is driven to the rear side of each row of platform steel pipe piles corresponding to each slideway platform beam, and the top elevation of the winch steel pipe pile is the same as the top elevation of the platform steel pipe pile;

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

[0007] Several driving mechanisms are installed one by one between several winch steel pipe piles and several slide platform beams; each driving mechanism includes a winch installed on the winch steel pipe pile, a rear fixed pulley installed between two H-shaped steels in the middle and front part of the slide platform beam, and a front fixed pulley installed between two H-shaped steels at the front end of the slide platform beam;

[0008] The method for splicing and placing long pipes into water of the present invention comprises the following steps:

[0009] Step 1: Set up assembly welding stations, anti-corrosion stations, and launching stations in sequence from back to front on the pipeline splicing platform, and mark the assembly welding stations, anti-corrosion stations, and shipping stations with paint on each platform beam and slideway platform beam of the pipeline splicing platform;

[0010] Step 2: Use a crawler crane to hoist multiple pipe segments onto the assembly and welding station of the pipeline splicing platform. Manual personnel cooperate with the crawler crane to align adjacent pipe segments and assemble them into pipeline segments of length L. Then, triangular wooden wedges are inserted on both sides of the bottom of the pipe segment located on the assembly and welding station. The splicing circumferential seam between two adjacent pipe segments is welded and the weld is inspected. Then, several hooks corresponding to the several slide platform beams are welded on the same busbar on the outer surface of the pipeline segment.

[0011] Step three: first, the ends of the wire ropes on several winches are passed downward around the corresponding rear fixed pulleys, and then hung on the hooks of several pipeline segments one by one. Then, the triangular wooden wedges placed on the assembly and welding station are removed, and then several winches are synchronously started through the same control cabinet. The steel wire ropes on the several winches pull the pipeline segment forward to the anti-corrosion station. Then, triangular wooden wedges are respectively inserted on both sides of the bottom of the pipeline segment located at the anti-corrosion station, and the pipeline joints are treated with anti-corrosion. Finally, socket flanges are welded to both ends of the pipeline segment, and flange blind plates are used to seal both ends of the pipeline segment. At the same time, the traction rope is tied to the flange blind plates.

[0012] Step 4: First, the ends of the wire ropes on the several winches are passed down and around the corresponding rear and front fixed pulleys in sequence, and then hung on the hooks of the several pipeline segments one by one. Then, the triangular wooden wedges placed on the anti-corrosion station are removed, and the several winches are synchronously started through the same control cabinet. The wire ropes on the several winches pull the pipeline segment forward to the launching station, and then triangular wooden wedges are inserted on both sides of the bottom of the pipeline segment at the launching station, so that the pipeline segment is on standby at the launching station.

[0013] Step five: when the tide rises, first remove the triangular wooden wedges placed on the launching station, and then control the rotation speed of several winches through the same control cabinet. The steel wire ropes on the winches will pull the pipeline segment forward to the gentle slope between the launching slide and the pipeline splicing platform. Then slowly release the steel wire ropes on the winches, so that the pipeline segment can roll freely along the launching slide to the water by relying on its center of gravity. The pipeline segment with both ends blocked will naturally float up after being submerged in water. As the pipeline segment rolls downward, the ends of the steel wire ropes on the winches will naturally fall off the hooks. Finally, the steel wire ropes on the winches are retracted, and the pipeline segment in the water is towed out by the anchor boat.

[0014] In the above-mentioned method for splicing and launching long and large pipelines into water, there are three platform steel pipe piles in each row, and a square pile top head steel plate is fixed on the top surface of each platform steel pipe pile.

[0015] The above-mentioned method for splicing and launching long and large pipes into water, wherein, an I-beam is pre-embedded on both sides of the top surface inside each of the launching slide beams; a beam top steel plate is laid on the top surface of each launching slide beam and welded to the top surfaces of the upper wing plates of the two I-beams; each launching slide beam is also provided with a trolley limiting mechanism, which includes two lateral limiting plates welded one-to-one to the two side surfaces of the beam top steel plate, two blocking plates symmetrically welded to the exposed surfaces of the I-beams on both sides near the top of the launching slide beam, and a blocking round steel inserted into a circular hole opened in the middle of the two blocking plates.

[0016] In the above-mentioned method for splicing and launching long and large pipes into water, a slope foot steel pipe pile is driven at the slope foot of each of the launching slide beams.

[0017] The method for splicing and launching long and large pipelines of the present invention has the following characteristics: it integrates the functions of pipeline splicing and launching, adopts steel pipe piles as the load-bearing piles of the pipeline splicing platform, and the launching slide beam is supported by the mortar-laid stone slope protection surface, and adopts reinforced concrete beams, which have strong strength, rigidity and stability, and also have anti-overturning stability, wind resistance and anti-skid safety. It not only facilitates the splicing and launching of pipeline segments, but also forms an assembly line operation of pipeline segments, reduces the land occupation and construction cost of the pipeline segment prefabrication site, and can greatly improve the quality protection of the finished product of the pipeline segment entering the water. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a plan view of a splicing platform used in the method for splicing and putting into water long pipes of the present invention;

[0019] Figure 2 It is a longitudinal section view of a splicing platform used in the method for splicing and putting into water a long pipe of the present invention;

[0020] Figure 2ais a cross-sectional view of a launching slide beam in a splicing platform of the present invention;

[0021] Figure 3 This is a state diagram of the process of performing step 2 of the method for splicing and placing a long pipe into water according to the present invention;

[0022] Figure 4 This is a state diagram when performing step three of the method for splicing and putting long pipes into water according to the present invention;

[0023] Figure 5 This is a state diagram when performing step 4 of the method for splicing and putting into water a long pipe of the present invention;

[0024] Figure 6 This is a state diagram when performing step five of the method for splicing and putting into water a long pipe of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] See also Figures 1 to 6 The method for splicing and launching a long pipeline into water of the present invention adopts a splicing platform built on the coast and including a length direction parallel to the coastline, the splicing platform includes a pipeline splicing platform, a launching slide and several driving mechanisms; wherein,

[0027] The height of the pipeline splicing platform is 1m to 2m and includes a plurality of platform beams 11 arranged perpendicular to the coastline at intervals of about 18m; two platform beams corresponding to each other are located at both ends of the pipeline splicing platform and a plurality of platform beams spaced apart in the middle of the pipeline splicing platform serve as slide platform beams 12 (see Figure 1 and Figure 2 ); Each platform beam 11 is made of a single H200×200×8×12 steel; each slide platform beam 12 is made of two H340×250×9×14 steels spaced apart; each platform beam 11 and each slide platform beam 12 is supported by a row of platform steel pipe piles, each row of platform steel pipe piles is composed of three platform steel pipe piles 13 with an outer diameter of 630mm and spaced apart, and the spacing between the three platform steel pipe piles 13 is 4m and 5m, A square pile top capping steel plate 130 with a size of 750 mm × 750 mm is fixed on the top surface of each platform steel pipe pile 13, and an expanded foundation 13A is set on the ground of the platform steel pipe pile 13 at the front end; a winch steel pipe pile 14 is driven on the rear side (landward side) of a 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 the top elevation of the platform steel pipe pile 13.

[0028] The water slide is composed of several water slide beams 2, which are fixed on a mortar-laid stone slope protection surface 2A with a slope of 1:1.5 and connected to the front ends (seaward ends) of several slide platform beams 12 in a one-to-one correspondence. Each water slide beam 2 is a rectangular reinforced concrete beam with a cross-sectional size of 600mm×800mm. A slope foot steel pipe pile 20 is driven at the slope foot of each water slide beam 2. An I-beam 21 is embedded on both sides of the top surface of each water slide beam 2. A 10mm thick beam top steel plate 22 (see the top surface of each water slide beam 2) is laid on the top surface of each water slide beam 2 and is welded to the top surface of the upper wing plates of the two I-beams 21. Figure 2a ), the surface of the beam top steel plate 22 is coated with butter for protection; a gentle slope is provided between the top of each launching slide beam 2 and the front end of the corresponding slide platform beam 12;

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

[0030] The method for splicing and placing long and large pipes into water of the present invention comprises the following steps:

[0031] Step 1: Set up the assembly welding station, anti-corrosion station and launching station in sequence from back to front on the pipeline splicing platform, and mark the assembly welding station, anti-corrosion station and shipping station with paint on each platform beam 11 and slide platform beam 12 of the pipeline splicing platform;

[0032] Step 2: Use a crawler crane to hoist twelve 20m long pipe sections and place them on the assembly and welding station of the pipeline splicing platform. Manual personnel cooperate with the crawler crane to complete the alignment of adjacent pipe sections and assemble them into a 240m long pipeline segment 10. Then, triangular wooden wedges 4 are respectively inserted on both sides of the bottom of the pipe section located on the assembly and welding station to prevent the pipe section from moving. Then, the splicing circumferential seam between the two adjacent pipe sections is welded and the weld is inspected. Then, several hooks 1A corresponding to several slide platform beams 12 are welded on the same busbar on the outer surface of the pipeline segment 10 (see Figure 3 );

[0033] Step three, first, the ends of the wire ropes 30 on the several winches 3 are respectively passed downward around the corresponding rear fixed pulleys 31, and then hung on the hooks 1A of the several pipe segments 10 one by one, then the triangular wooden wedges 4 placed on the assembly welding station are removed, and then the several winches 3 are synchronously started through the same control cabinet, and the pipe segment 10 is pulled forward to the anti-corrosion station by the wire ropes 30 on the several winches 3, and then triangular wooden wedges 4 are respectively plugged on both sides of the bottom of the pipe segment 10 located on the anti-corrosion station to prevent the pipe segment 10 from moving, and the pipe joint is anti-corrosion treated, and finally, socket flanges are respectively welded at both ends of the pipe segment 10, and the two ends of the pipe segment 10 are sealed with flange blind plates, and the traction rope is tied to the flange blind plates (see Figure 4 );

[0034] Step 4: First, the ends of the wire ropes 30 on the several winches 3 are passed downwards and around the corresponding rear fixed pulleys 31 and front fixed pulleys 32 in turn, and then hung on the hooks of the several pipe segments 10 one by one. Then, the triangular wooden wedges 4 placed on the anti-corrosion station are removed, and the several winches 3 are started synchronously through the same control cabinet. The wire ropes 30 on the several winches 3 pull the pipe segment 10 forward to the launching station, and then triangular wooden wedges 4 are respectively plugged on both sides of the bottom of the pipe segment 10 located at the launching station to prevent the pipe segment 10 from moving, so that the pipe segment 10 is on standby at the launching station (see Figure 5 );

[0035] Step 5: When the tide comes in, first remove the triangular wooden wedge 4 placed on the launching station, then control the rotation speed of several winches 3 through the same control cabinet, and use the wire ropes 30 on several winches 3 to pull the pipeline segment 10 forward to the gentle slope between the launching slide and the pipeline splicing platform, and then slowly release the wire ropes 30 on several winches 3, so that the pipeline segment 10 can roll freely along the launching slide (several launching slide beams 2) to the water by relying on the center of gravity. The pipeline segment 10 with both ends blocked will naturally float up after being submerged in the water, and the pipeline segment 10 will roll downward (see Figure 6 ), the ends of the steel wire ropes 30 on the several winches 3 will naturally fall off from the hook 1A, and finally the steel wire ropes 30 on the several winches 3 are retracted, and the pipeline segment 10 in the water is towed out by the anchoring boat pulling the towing rope.

[0036] Before the pipeline segment 10 rolls into the water, the wire rope of the winch is stressed to ensure that the wire rope has a certain tension. When the pipeline segment 10 rolls into the water, the pipeline segment 10 relies on the slope of the launching chute beam 2 and can be directly launched into the water without any external force.

[0037] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. A method for splicing and launching long and large pipelines into water, comprising a pipeline splicing platform built on the coast and having a length direction parallel to the coastline, a launching slide, and several drive mechanisms; wherein: The pipeline splicing platform includes a plurality of platform beams arranged perpendicularly to the coastline at intervals; two platform beams located at both ends of the pipeline splicing platform in a one-to-one correspondence and a plurality of platform beams located at intervals in the middle of the pipeline splicing platform are slideway platform beams; each platform beam is made of a single H-shaped steel; each slideway platform beam is made of two H-shaped steels arranged at intervals; each platform beam and each slideway platform beam is supported by a row of platform steel pipe piles, and a winch steel pipe pile is driven to the rear side of each row of platform steel pipe piles corresponding to each slideway platform beam, and the top elevation of the winch steel pipe pile is the same as the top elevation of the platform steel pipe pile; The water slide is composed of several water slide beams fixed on the mortar-laid stone slope protection surface and connected one by one to the front ends of several slide platform beams; each water slide beam is a reinforced concrete beam with a rectangular cross-section, and a gentle slope is provided between the top end of each water slide beam and the front end of the corresponding slide platform beam; Several driving mechanisms are installed one by one between several winch steel pipe piles and several slide platform beams; each driving mechanism includes a winch installed on the winch steel pipe pile, a rear fixed pulley installed between two H-shaped steels in the middle and front part of the slide platform beam, and a front fixed pulley installed between two H-shaped steels at the front end of the slide platform beam; It is characterized in that the method for splicing and putting the long and large pipes into water comprises the following steps: Step 1: Set up assembly welding stations, anti-corrosion stations, and launching stations in sequence from back to front on the pipeline splicing platform, and mark the assembly welding stations, anti-corrosion stations, and shipping stations with paint on each platform beam and slideway platform beam of the pipeline splicing platform; Step 2: Use a crawler crane to hoist multiple pipe segments onto the assembly and welding station of the pipeline splicing platform. Manual personnel cooperate with the crawler crane to align adjacent pipe segments and assemble them into pipeline segments of length L. Then, triangular wooden wedges are inserted on both sides of the bottom of the pipe segment located on the assembly and welding station. The splicing circumferential seam between two adjacent pipe segments is welded and the weld is inspected. Then, several hooks corresponding to the several slide platform beams are welded on the same busbar on the outer surface of the pipeline segment. Step three: first, the ends of the wire ropes on several winches are passed downward around the corresponding rear fixed pulleys, and then hung on the hooks of several pipeline segments one by one. Then, the triangular wooden wedges placed on the assembly and welding station are removed, and then several winches are synchronously started through the same control cabinet. The steel wire ropes on the several winches pull the pipeline segment forward to the anti-corrosion station. Then, triangular wooden wedges are respectively inserted on both sides of the bottom of the pipeline segment located at the anti-corrosion station, and the pipeline joints are treated with anti-corrosion. Finally, socket flanges are welded to both ends of the pipeline segment, and flange blind plates are used to seal both ends of the pipeline segment. At the same time, the traction rope is tied to the flange blind plates. Step 4: First, the ends of the wire ropes on the several winches are passed down and around the corresponding rear and front fixed pulleys in sequence, and then hung on the hooks of the several pipeline segments one by one. Then, the triangular wooden wedges placed on the anti-corrosion station are removed, and the several winches are synchronously started through the same control cabinet. The wire ropes on the several winches pull the pipeline segment forward to the launching station, and then triangular wooden wedges are inserted on both sides of the bottom of the pipeline segment at the launching station, so that the pipeline segment is on standby at the launching station. Step five: when the tide rises, first remove the triangular wooden wedges placed on the launching station, and then control the rotation speed of several winches through the same control cabinet. The steel wire ropes on the winches will pull the pipeline segment forward to the gentle slope between the launching slide and the pipeline splicing platform. Then slowly release the steel wire ropes on the winches, so that the pipeline segment can roll freely along the launching slide to the water by relying on its center of gravity. The pipeline segment with both ends blocked will naturally float up after being submerged in water. As the pipeline segment rolls downward, the ends of the steel wire ropes on the winches will naturally fall off the hooks. Finally, the steel wire ropes on the winches are retracted, and the pipeline segment in the water is towed out by the anchor boat.

2. The method for splicing and placing long and large pipes into water according to claim 1, characterized in that: There are three platform steel pipe piles in each row, and a square pile top head steel plate is fixed on the top surface of each platform steel pipe pile.

3. The method for splicing and placing long and large pipes into water according to claim 1, characterized in that: An I-beam is embedded on both sides of the top surface of each launching water slide beam; a beam top steel plate is laid on the top surface of each launching water slide beam and welded to the top surfaces of the upper wing plates of the two I-beams; a trolley limiting mechanism is also provided on each launching water slide beam, which includes two lateral limiting plates welded one-to-one to the two side surfaces of the beam top steel plate, two blocking plates symmetrically welded to the exposed surfaces of the I-beams on both sides near the top of the launching water slide beam, and a blocking round steel inserted into a circular hole opened in the middle of the two blocking plates.

4. The method for splicing and placing long and large pipes into water according to claim 1 or 3, characterized in that: A slope foot steel pipe pile is respectively driven at the slope foot of each of the launching slideway beams.

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