Pipeline laying assembly line in plain area

Abstract

The utility model belongs to the technical field of pipeline construction, and particularly relates to a plain area pipeline lowering assembly line which is arranged at the front end of the starting end of pipe ditch excavation and sequentially connected with a pipeline frame, a welding platform, a flaw detection platform, a joint coating platform, a pipe ditch support and a tractor in series through a conveying device. A pipeline is stored through the pipeline rack and conveyed to the welding platform for welding connection, welding quality detection is carried out on the flaw detection platform, anti-corrosion treatment is carried out on the joint coating platform, finally, the pipeline enters a pipe ditch through the pipe ditch support and then is connected to the bottom of the excavator through the tractor, and the excavator drags and distributes the pipeline. The problems that the road width is too large and the construction period is too long in traditional pipeline lowering are solved, the construction site can be saved, the construction efficiency is improved, and the construction cost is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of pipeline construction, and specifically relates to an underground pipeline assembly line in plain areas. Background Art

[0002] Construction time is cost; prolonged construction leads to a sharp increase in construction costs. Site efficiency is key; disorganized sites complicate equipment movement and reduce operational efficiency. Pipeline construction sites should fully utilize road length while minimizing road width. Currently, pipeline construction in plain areas still follows the traditional steps of pipe laying, welding, trench excavation, and pipeline laying. However, in urban areas, where land resources are extremely scarce and construction deadlines are tight, traditional pipeline construction methods require innovation in both equipment and methods. Utility Model Content

[0003] The present application provides a pipeline laying line in plain areas, which can solve the problems of excessive road width occupation and long construction period in traditional pipeline laying lines.

[0004] The technical solution of this application is as follows:

[0005] A pipeline laying line for pipelines in plain areas, wherein the line is arranged at the front end of the starting end of the trench excavation, and a conveying device is arranged from the front end to the starting end of the trench excavation, and the conveying device is sequentially connected in series from the front end of the trench excavation to the starting end:

[0006] a pipeline rack, disposed on one side of the conveying device, and used to store pipeline units and convey the pipeline units to the conveying device;

[0007] The welding platform is matched with the spacing between the pipeline racks and the length of the pipelines. The welding platform includes a connecting unit and a welding unit. The connecting unit is used to align the ends of two continuous pipelines, weld fittings to the pipelines, and weld the ends of the two continuous pipelines. The fittings include a traction head provided at the front end of the first section of the pipeline.

[0008] The flaw detection platform, the distance between it and the welding platform matches the length of the pipeline, and the flaw detection platform is used to detect the welding quality of the pipeline head and tail;

[0009] Patching platform, used to wrap anti-corrosion materials around the ends of the pipeline;

[0010] A limiting platform includes a bracket and a locking device, wherein the locking device has a hoop that allows the pipeline to pass through and a tightening member that clamps the hoop;

[0011] A pipe trench support is fixed to the ground and extends obliquely toward the interior of the pipe trench. The bottom of the pipe trench support is provided with pulleys at several heights to support the pipeline.

[0012] The tractor includes hooks at both ends, the two hooks are connected by a turnbuckle and a spring, the hook at one end of the turnbuckle is connected to the traction head, and the hook at one end of the spring is connected to the bottom of the excavator.

[0013] Furthermore, the conveying device includes a conveying shaft connecting each platform and a plurality of driving wheels arranged on both sides of the conveying shaft to support the pipeline to move on the conveying shaft, and each of the driving wheels is driven by a motor.

[0014] Due to the adoption of the above technical solution, the beneficial effects of this application are as follows:

[0015] 1. The assembly line in this application changes the "connect first, then lay the pipes" model in the traditional pipe laying method. In the technical solution of the pipe laying assembly line in this application, the connection and laying of pipes are carried out sequentially, that is, there is no need to connect several pipelines first and then place the pipelines in the trench uniformly. The technical solution of this application can significantly reduce the width occupied by the construction site. Specifically, arranging the pipelines in sequence will occupy the lateral space outside the trench. Moreover, the pipelines are generally stacked, and moving the pipelines will complicate the equipment movement line. The equipment will move back and forth and be hoisted in the construction site, and the efficiency will be significantly reduced. In addition, during the continuous excavation process, it is only necessary to reserve construction space on both sides of the trench, and the movement of the pipelines is carried out inside the trench, that is, this application makes full use of the internal space of the excavated trench, which can significantly reduce the reserved construction space on both sides of the trench excavation. After reducing the construction space, the land requisition area is greatly reduced, thereby reducing the land requisition costs and the costs of later vegetation restoration, while shortening the time for operation cleaning.

[0016] 2. The present application can fully coordinate the progress of pipe laying and trench excavation, and carry out pipe laying simultaneously during the process of pipeline excavation, which not only saves the step of hoisting and lowering pipes and reduces construction equipment, but also enables the excavator to play its traction role and reduce equipment rental costs. In the present application, the welding platform, patching platform, and flaw detection platform are all supported by mature existing technologies, which can significantly improve the connection quality of pipelines and avoid rework. The present application innovatively uses excavation equipment as a traction device, thereby replacing traditional pipe laying. Furthermore, the present application combines the three processes of pipe laying, trench excavation, and pipeline trenching into one, thereby improving construction efficiency, saving construction costs, and reducing construction period.

[0017] 3. The technical solution of the down-pipe assembly line of the present application is provided with a pipeline limiting platform, and the limiting platform is specially designed to cooperate with the tail-end effect generated during the pulling process of the pipeline. During the pulling process of the pipeline, the tail end of the connected pipeline will produce a large displacement. Excessive displacement will affect the welding construction of the upstream pipeline and also bring safety hazards to on-site construction personnel. By designing a limiting platform, the displacement and turning angle of the pipeline in the assembly line can be controlled to ensure the normal operation of the down-pipe assembly line. The assembly line works intermittently. When the downstream is higher than the upstream, the limiting device can clamp the pipeline to prevent the pipeline from sliding under the action of gravity, thereby avoiding slippage and impacting the welding process of the upstream pipeline. When the downstream is lower than the upstream, the limiting platform can control the upstream length to ensure the smooth progress of the connection process.

[0018] 4. The tractor in this application is designed to cooperate with the limit device and the construction schedule. When the traction process is paused, the pipeline will have an inertial impact, and the spring in the tractor can offset the impact force. In fact, during the pipeline traction process, it is not a strictly straight path. The pipeline is laid elastically, and twisting force will be generated during the traction process. The spring and basket screw in the tractor can reduce the twisting force and release stress by rotating. Moreover, the basket screw can be rotated to adjust the length of the tractor to prevent damage to the construction workers during removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0020] Figure 1 A schematic diagram of a pipeline downpipeline in a plain area provided for this application;

[0021] Figure 2 This is a schematic diagram of the limiting platform described in this application;

[0022] Figure 3 A schematic diagram of the trench support in this application;

[0023] In the attached figure:

[0024] 1. Conveying device; 1-1. Conveying shaft; 1-2. Driving wheel; 2. Pipe rack; 3. Welding platform; 4. NDT platform; 5. Patching platform; 6. Limiting platform; 6-1. Bracket; 6-2. Hoop; 6-3. Fastener; 7. Trench bracket; 8. Puller; 8-1. Hook; 8-2. Turnbuckle; 8-3. Spring; 9. Puller head. DETAILED DESCRIPTION

[0025] Based on the background technology, traditional pipeline construction is divided into trench construction and trench construction. Trench construction completes most of the processes, while trench construction has fewer steps and mainly involves laying pipes. Traditional pipe laying requires a series of processes such as welding pipelines, anti-corrosion, and welding quality inspection at the construction site. The equipment used in these processes requires additional space in the trench. Based on this, this application provides a pipeline laying production line in plain areas.

[0026] As attached Figure 1 ~Attached Figure 3 As shown, the assembly line is arranged at the front end of the starting end of the trench excavation, and a conveying device 1 is arranged from the front end to the starting end of the trench excavation. The conveying device 1 includes a conveying shaft 1-1 connecting each platform and a plurality of driving wheels 1-2 arranged on both sides of the conveying shaft 1-1 to support the movement of the pipeline on the conveying shaft 1-1, and each of the driving wheels 1-2 is driven by a motor. The motor drives each driving wheel 1-2 to rotate synchronously, and sequential processing can be achieved by coordinating with the spacing between each platform. The starting end of the trench excavation is the front end of the excavation starting end, and the site in front of the starting end that does not need to be excavated is the front end of the excavation starting end. The assembly line of this application is arranged in the site in front.

[0027] The conveying device 1 is connected in series from the front end of the trench to the starting end:

[0028] A pipe rack 2 is mounted on one side of the conveyor device 1 and is used to store and deliver pipeline units to the conveyor device 1. Pipe rack 2 is used to stack required pipelines. Lightweight pipelines can be manually transported to the conveyor device 1. By way of example and not limitation, a conveyor belt can also be installed on pipe rack 2 to deliver pipelines to the conveyor device 1.

[0029] The welding platform 3 is spaced apart from the pipe rack 2 to match the length of the pipeline. It comprises a connecting unit and a welding unit. The connecting unit is used to align the ends of two continuous pipelines, weld fittings to the pipelines, and weld the joints between the two continuous pipelines. The fittings include a pulling head 9 located at the front end of the first pipeline section. The pulling head 9 is the component that connects to the tractor 8. For example, it can be a ring, with the hook 8-1 engaging the ring to form a secure connection. Before welding, the connecting unit must be used to align the centerlines of the pipelines before welding. The connecting unit is conventional and can be a pipe external adapter. The conveying device 1 requires leveling during installation, so the pipelines are at roughly the same height on the conveying device 1. Fine adjustments at the connecting unit using an adapter can align the two pipelines end to end. The welding unit utilizes automatic welding equipment. During operation, the selection of the automatic welding machine and welding materials is determined based on the pipe diameter, wall thickness, and material. For example, for No. 20 steel, E4303 welding wire or flux-cored gas-shielded wires such as LQ122, LQ172, and LQ212 can be used. Automatic welding machines are available from brands such as Panasonic, Lincoln, Megmeet, ESAB, and JASIC. These machines are set in a fixed position to automatically complete the entire welding process, including adjusting welding parameters and moving the welding gun.

[0030] The inspection platform 4, spaced apart from the welding platform 3 and sized to match the length of the pipeline, is used to inspect the weld quality at both ends of the pipeline. By way of example and not limitation, this application utilizes conventional ultrasonic testing, which is faster and more efficient. If the inspection platform 4 detects weld quality issues and requires rework, the conveyor 1 flips over and drags the pipeline back to the welding unit for rework. Alternatively, a separate automatic welder can be installed behind the inspection platform 4, or manual secondary welding can be performed.

[0031] The patching platform 5 is used to wrap the anti-corrosion material around the ends of the pipeline. The patching platform 5 can be replaced by a general wrapping machine. In pipeline construction, heat shrink sleeves or cold wrapping anti-corrosion tapes are usually used.

[0032] The limiting platform 6 includes a bracket 6-1 and a locking device, wherein the locking device has a ferrule 6-2 that allows the pipeline to pass through and a tightening member 6-3 that clamps the ferrule 6-2. Figure 2 As shown, the hoop 6-2 is C-shaped, and pressure is applied to the hoop 6-2 by the tightening member 6-3 to reduce its opening, thereby achieving fixation.

[0033] The trench support 76-1 is fixed to the ground and extends obliquely into the trench. The bottom of the trench support 76-1 is provided with pulleys at several heights to support the pipeline. Figure 3As shown, the wheel set in the figure is the pulley. It should be noted that the pipeline has an elastic modulus and can form a certain degree of bending, which does not destroy its function. Therefore, during the pipe laying process, the pipeline needs to be tilted into the trench from the site. Since the depth of the trench is generally shallow, about 1m~1.3m, the curvature of the pipeline can fully allow this pipe laying method. During specific operations, the buried depth of the pipeline should be determined according to the geographical location. For example, in northern my country, it needs to be buried below the permafrost. The trench bracket 76-1 is anchored to the ground and anchored twice on the side wall of the foundation pit. Pulleys of different heights can carry the pipeline at different positions to ensure that it slides smoothly into the trench.

[0034] The tractor 8 includes hooks 8-1 at both ends, and the two hooks 8-1 are connected by a basket screw 8-2 and a spring 8-3. The hook 8-1 at one end of the basket screw 8-2 is connected to the traction head 9, and the hook 8-1 at one end of the spring 8-3 is connected to the bottom of the excavator.

[0035] During specific implementation, a connecting member needs to be installed between the two crawlers of the excavator to connect with the hook 8 - 1 . For example, the connecting member may be a circular ring.

[0036] The assembly line in this application changes the "connect first, then lay the pipes" model in the traditional pipe laying method. In the technical solution of the pipe laying assembly line in this application, the connection and laying of pipes are carried out sequentially, that is, there is no need to connect several pipelines first and then place the pipelines in the trench uniformly. The technical solution of this application can significantly reduce the width occupied by the construction site. Specifically, arranging the pipelines in sequence will occupy the lateral space outside the trench. Moreover, the pipelines are generally stacked, and moving the pipelines will complicate the equipment movement line. The equipment will move back and forth and be hoisted in the construction site, and the efficiency will be significantly reduced. In addition, during the continuous excavation process, it is only necessary to reserve construction space on both sides of the trench, and the movement of the pipelines is carried out inside the trench, that is, this application makes full use of the internal space of the excavated trench, which can significantly reduce the reserved construction space on both sides of the trench excavation. After reducing the construction space, the land requisition area is greatly reduced, thereby reducing the land requisition costs and the costs of later vegetation restoration, while shortening the time for operation cleaning.

[0037] This application fully coordinates the progress of pipe laying and trench excavation, allowing pipe laying to proceed simultaneously during pipeline excavation. This not only eliminates the need for pipe hoisting and lowering, reducing construction equipment, but also allows the excavator to fully utilize its traction function, reducing equipment rental costs. In this application, the welding platform 3, the patching platform 5, and the flaw detection platform 4 are all supported by mature existing technologies, significantly improving the quality of pipeline connections and avoiding rework.

[0038] When the above-mentioned pipeline is used, the pipeline laying construction specifically includes the following steps:

[0039] S01) Level the site and arrange the pipelines on the pipeline rack along the direction of the trench;

[0040] S02) The pipeline rack delivers the pipeline to the conveying device;

[0041] S03) When the first pipeline enters the welding platform, a traction head is welded to the front end of the pipeline, and at the same time, the second pipeline is conveyed to the conveying device;

[0042] S04) The first pipeline enters the flaw detection platform for welding quality inspection. At the same time, the front end of the second pipeline is aligned with the tail end of the first pipeline along the central axis and welded together through the welding unit;

[0043] S05) The first pipeline enters the patching platform to be wrapped with anti-corrosion material. At the same time, the front end of the second pipeline enters the flaw detection platform for welding quality inspection. At the same time, the tail end of the second pipeline is welded to the front end of the third pipeline on the welding platform through the welding unit;

[0044] S06) Loosen the clamping device to allow the first pipeline to pass through the clamping device and the pipeline support in sequence and then enter the pipeline trench;

[0045] S07) The excavator enters the trench or straddles both sides of the trench, and the traction head is installed between the two crawlers;

[0046] S08) A tractor is installed between the traction head of the first pipeline and the traction head of the excavator. The excavator continuously excavates the trench from the starting end of the trench excavation. The pipeline is controlled to start or stop according to the excavation distance so that the pipeline connection progress matches the excavation distance.

[0047] In step S08), when there is groundwater in the trench, a buoy is installed on the pipeline entering the trench;

[0048] When there is no groundwater in the trench, a detachable wheel set is installed below the pipeline entering the trench.

[0049] S09) When the pipeline reaches the end point, adjust one end of the turnbuckle until the spring returns to its original length and then remove the retractor.

[0050] In step S09), when the pipeline reaches the end point, the height difference between the end point and the starting point is measured. When the height difference exceeds 1.8m, the soil in front of the middle position of the trench and the back of the middle position are backfilled, and the tractor is removed.

[0051] The technical solution for the down-pipe assembly line applied for has a pipeline limiting platform, which is specially designed to cooperate with the tail-end effect generated during the pulling process of the pipeline. During the pulling process of the pipeline, the tail end of the connected pipeline will produce a large displacement. Excessive displacement will affect the welding construction of the upstream pipeline and also bring safety hazards to on-site construction personnel. By designing a limiting platform, the displacement and turning angle of the pipeline in the assembly line can be controlled to ensure the normal operation of the down-pipe assembly line. The assembly line works intermittently. When the downstream is higher than the upstream, the limiting device can clamp the pipeline to prevent the pipeline from sliding under the action of gravity, thereby avoiding slippage and impacting the welding process of the upstream pipeline. When the downstream is lower than the upstream, the limiting platform can control the upstream length to ensure the smooth progress of the connection process.

[0052] The tractor in this application is designed to cooperate with the limit device and the construction schedule. When the traction process is paused, the pipeline will have an inertial impact, and the spring in the tractor can offset the impact force. In fact, during the pipeline traction process, it is not a strictly straight path. The pipeline is laid elastically, and twisting force will be generated during the traction process. The spring and basket screw in the tractor can reduce the twisting force and release the stress by rotating. Moreover, the basket screw can be rotated to adjust the length of the tractor to prevent damage to the construction workers during removal.

[0053] The above construction method realizes the synchronization of trench excavation and pipe laying. The connection between pipelines and the corrosion protection of pipelines are carried out in a procedural manner along with the excavation progress. It can concentrate construction time, synchronize the construction progress of each construction group, reduce construction procedures, and greatly increase the efficiency of excavation and pipe laying.

[0054] Taking a 1km buried pipeline, using a No. 20 Φ219×7 seamless steel pipe, as an example, this application details the time savings it offers. It assumes the same external constraints as traditional pipe laying, including a single welding machine, the same machinery and equipment, the same construction team, the same geological conditions, and the same project volume.

[0055] Traditionally, mobile cranes are used on construction sites. Each time a crane is used to lift and lay pipes, it requires outriggers. The crane moves along the pipeline, positioning it once, and then uses its outriggers to lift and lay pipes. Normally, two pipelines can be laid at a time. After the lifting is complete, the outriggers are retracted and the crane continues to move forward, repeating the process. Approximately six to seven pipes can be laid per hour. Each pipeline is approximately 10 meters long, and a 1km pipeline can accommodate approximately 100 pipes. Pipe laying takes two working days.

[0056] The device of the present application eliminates the need for pipe laying in the construction method. When using the pipe laying line of the present application, it takes only 2 hours to lay out the line, check the equipment, and power it on. Once the pipeline is in place, trench excavation can begin.

[0057] The time required to assemble a weld is about 25 to 30 minutes. A 1km pipeline has about 100 welds, and the assembly takes about 50 hours, or about 6 days. During the equipment installation process, the present application controls the pulleys of the conveying device to be at the same height, and the center of the pipeline can be aligned with only manual fine-tuning. When the present application is implemented, automatic welding equipment is preferably used for welding. The welding equipment does not need to be moved. When installed in a fixed position, it can greatly improve welding efficiency and reduce construction time.

[0058] The welding work of the two is the same. The traditional welding method takes about 12 days. It can be reduced by 4 days when the fixed-position automatic welding machine of this application is used. However, the production line of this application can also perform weld inspection and anti-corrosion at the same time as welding. After the traditional method of anti-corrosion patching is completed, the trench is dug and the trench is excavated using an excavator. Due to the reasons of the construction surface and safety considerations, the excavation task cannot be carried out at the same time as welding anti-corrosion. It needs to be staggered. It takes 4 days to excavate 1KM. Minus the cross time that can be advanced by 2 days, the construction period needs to be increased by 2 days. It takes 2 days to dig the trench and backfill. This step takes a total of 4 days.

[0059] This application utilizes an assembly line to simultaneously weld, inspect weld joints, perform corrosion protection, and excavate the trench, all while using the pipe support. This process adds virtually no time to the project. Pipeline trenching can be carried out immediately after corrosion protection and patching. Trenching and backfilling take two days, saving two days of trenching, backfilling, and excavation time.

[0060] Overall, the traditional method would take 26 days to complete the project, while this application can complete the project in about 12 days or less, saving an overall 54% of time and reducing construction costs by 20%.

[0061] In specific implementation, there are three modes of pipeline trenching, which can basically solve various situations in plain areas.

[0062] The first method involves narrow trenches, smaller than the width between the crawler excavator's tracks. The excavator can then travel over the trench. The trench can be excavated in advance or as the pipeline is being constructed. The excavator, equipped with a support and tractor, simultaneously digs the trench while pulling the pipeline into it. GPS-controlled travel distance ensures safety. The excavator works above the trench, installing a pulley block beneath each pipeline it pulls. This method is suitable for smaller-diameter pipelines.

[0063] The second scenario involves a wide trench and deep groundwater. The groundwater level is low, and no water is visible at the bottom of the trench. Excavation equipment can be used directly within the excavated trench. Pipeline supports are fixed to the trench bottom to facilitate pulling the pipeline and prevent wear during the process. Subsequent steps are the same as for the first scenario.

[0064] The third scenario involves a wide trench and shallow groundwater. In southern China, where water networks are dense and groundwater levels are high, trench excavation can be accompanied by significant amounts of water, filling the trench with accumulated water, especially during summer rainstorms. A self-floating excavator with a bracket and tractor installed at its base can be used. While the trench is being excavated, the pipeline is simultaneously pulled into the trench. If the buoyancy is insufficient, buoys can be installed on the pipeline to leverage the water's buoyancy for better traction. This method overcomes the obstacles posed by excessive water and instead turns the water into a construction aid. If the trench is relatively dry, flooding can be used to raise the water level, facilitating pipeline traction. Once the pipeline is in place, the buoys are removed, water is added for pressure testing, and the pipeline is lowered to the trench bottom, with counterweights added to prevent it from floating.

[0065] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0066] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A pipeline under-line production line in plain areas, characterized by: The assembly line is arranged at the front end of the trench excavation starting end, and a conveying device is arranged from the front end to the trench excavation starting end. The conveying device is sequentially connected in series from the front end of the trench excavation to the starting end: a pipeline rack, disposed on one side of the conveying device, and used to store pipeline units and convey the pipeline units to the conveying device; The welding platform is matched with the spacing between the pipeline racks and the length of the pipelines. The welding platform includes a connecting unit and a welding unit. The connecting unit is used to align the ends of two continuous pipelines, weld fittings to the pipelines, and weld the ends of the two continuous pipelines. The fittings include a traction head provided at the front end of the first section of the pipeline. The flaw detection platform, the distance between it and the welding platform matches the length of the pipeline, and the flaw detection platform is used to detect the welding quality of the pipeline head and tail; Patching platform, used to wrap anti-corrosion materials around the ends of the pipeline; A limiting platform includes a bracket and a locking device, wherein the locking device has a hoop that allows the pipeline to pass through and a tightening member that clamps the hoop; A pipe trench support is fixed to the ground and extends obliquely toward the interior of the pipe trench. The bottom of the pipe trench support is provided with pulleys at several heights to support the pipeline. The tractor includes hooks at both ends, the two hooks are connected by a turnbuckle and a spring, the hook at one end of the turnbuckle is connected to the traction head, and the hook at one end of the spring is connected to the bottom of the excavator.

2. The pipeline unloading line in plain areas according to claim 1 is characterized in that: The conveying device includes a conveying shaft connected to each platform and a plurality of driving wheels arranged on both sides of the conveying shaft to support the pipeline to move on the conveying shaft, and each of the driving wheels is driven by a motor.

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