Large-diameter overhead pipeline replacement construction auxiliary device and construction method thereof

Abstract

The invention belongs to the technical field of building construction, and particularly relates to a large-diameter overhead pipeline replacement construction auxiliary device and a construction method of the large-diameter overhead pipeline replacement construction auxiliary device. A horizontal guide rail formed by cutting an old pipeline is adopted as a guide rail of a conveying table, so that the conveying table is driven by a winch to do axial reciprocating motion in a conveying through groove of the horizontal guide rail, and long-distance conveying of a hoisting pipe section on a roof is achieved; when a new pipeline is replaced and hoisted by adopting the device and the method, the hoisting equipment only needs to be arranged at one end of the horizontal guide rail and does not need to move along with the change of the final mounting position of the hoisting pipe section, so that the construction site area occupied by the hoisting operation of the hoisting equipment is reduced, and the influence of pipeline replacement construction on bottom surface production logistics is reduced. The method is particularly suitable for the situation that construction sites are insufficient. In addition, the horizontal guide rail is manufactured by axially cutting an old pipeline, so that the old pipeline is reused, and materials and construction cost are saved.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to an auxiliary device for replacing large-diameter overhead pipelines and its construction method. Background Technology

[0002] In production workshops of metallurgy, building materials, and other related fields, production facilities are compactly arranged, and space is limited. Therefore, most ventilation ducts and dust removal ducts are located on one side of the inner columns on the roof of the production plant. (See attached image) Figure 1 As shown, supports 91 are fixedly installed on the roof 90. The top of each support 91 has a semi-circular cross-section limiting groove 92. At least two supports 91 are provided, and at least two supports 91 are spaced apart along the axial direction of the limiting groove 92 to support pipes 8. The pipes 8 are positioned and installed within the limiting groove 92. These types of factory buildings generally have large spans and heights; correspondingly, the length and span of the pipes 8 on the roof are also relatively large, generally exceeding 100m in length and 12m in span. Furthermore, compared to other fields, the dust levels in the workshops of the aforementioned metallurgical plants are higher, therefore the dust removal pipes used are also thicker, with an outer diameter generally exceeding 1.2m. The main pipe located between two adjacent supports 91 is a single-piece, integrally formed hoisting pipe section. rise They typically weigh over 60 tons. To ensure production safety and meet environmental standards, these large-diameter, long-span pipelines require regular maintenance and replacement.

[0003] During the pipeline replacement and upgrade process, the old pipeline must first be removed from support 91 and hoisted away. Then, the new pipeline is hoisted onto support 91 and fixed. During the hoisting of the new pipeline, the length of the pipe segment hoisted in a single operation is greater than the distance between two adjacent supports 91. Due to the large length and weight of the pipe segment, it is prone to bending and deformation during hoisting, affecting subsequent assembly. In addition, due to the large weight of a single pipe segment, a large crawler crane or heavy tower crane is required to hoist the dust removal pipeline. These types of lifting equipment have a load capacity of over 70 tons, but they occupy a large area during hoisting and may even obstruct production and logistics roads, affecting production. The rental and erection costs of using large crawler cranes or heavy tower cranes are high, and the hoisting radius of conventional heavy machinery is extremely limited, making it impossible to replace pipelines on large-span factory roofs.

[0004] To address the challenge of replacing pipelines on a large-span factory roof and prevent bending and deformation of the hoisted pipe sections, an attempt was made on-site to reduce the length of the pipe sections and use a 50-ton truck crane for transport. However, due to the short length of the pipe sections, they could not be directly erected on the existing supports 91. Multiple auxiliary supports needed to be erected between two adjacent existing supports 91 for temporary support and positioning of the hoisted pipe sections. When erecting the auxiliary supports, it was crucial to ensure that they were collinear with the limiting grooves 92 on the original supports 91. The auxiliary supports were removed only after multiple pipe sections were welded. This process was cumbersome, wasteful of manpower, and posed significant safety hazards such as tipping over and falling from heights during the installation and dismantling of the auxiliary supports. Furthermore, due to the large total length of the pipeline, the boom length of conventional cranes was limited. Therefore, the crane position needed to be constantly adjusted according to the installation location of the pipe sections, still resulting in a large construction site footprint and impacting production. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide an auxiliary device and construction method for replacing large-diameter overhead pipelines. The device uses conventional lifting equipment for pipeline replacement and hoisting, which occupies a small area and has low hoisting cost. It enables the replacement of pipelines on the roof of large-span factory buildings, realizes the reuse of old pipelines, and is environmentally friendly.

[0006] The technical solution adopted by the present invention to solve this technical problem is: a construction auxiliary device for replacing large-diameter overhead pipelines, including multiple supports set on the roof, and a horizontal guide rail with an upward-facing conveying channel formed by cutting the old pipeline along the horizontal direction. The cross-section of the conveying channel is an arc-shaped structure and its corresponding central angle is less than 180°. The conveying channel is provided with a conveying platform that can reciprocate axially inside it. The top surface of the conveying platform is provided with an upward-opening limiting channel. The shape and size of the cross-section of the limiting channel are adapted to the outer wall of the pre-lifted pipe section. The length direction of the limiting channel is set along the axial direction of the conveying channel. The conveyor platform is provided in two sets, and the two sets of conveyor platforms are distributed at intervals along the axial direction of the conveyor channel; It also includes a winch located at one end of the horizontal guide rail, wherein the rotation axis of the drum on the winch is perpendicular to the length direction of the horizontal guide rail.

[0007] Furthermore, the central angle corresponding to the cross-section of the arc-shaped structure of the conveying channel is 120°.

[0008] Furthermore, the cross-section of the limiting groove is a circular arc segment structure with a corresponding central angle of less than 180°, and the cross-sectional radius of the limiting groove is the same as the radius of the outer wall of the hoisting pipe segment.

[0009] Furthermore, the conveyor table includes a base and a roller assembly disposed below the base, and the limiting through groove is disposed on the top surface of the base; The roller assembly has at least three sets, with two sets of roller assemblies symmetrically distributed on both sides of the limiting through groove. One set of roller assemblies is disposed on the bottom surface of the base. The roller assembly includes multiple rollers, which are evenly distributed on the base along the axial direction of the limiting through groove. Each roller is located within the conveying through groove and rolls against the groove wall. The rollers are rotatably connected to the base, and their rotation axis is perpendicular to the axis of the limiting through groove. The first arc segment, defined by connecting the endpoints of multiple rollers located on the same cross-section of the limiting groove away from the limiting groove, has the same radius as the conveying groove, and the central angle corresponding to the first arc segment is smaller than the central angle corresponding to the conveying groove.

[0010] Furthermore, the base includes multiple arc-shaped horizontal ribs, which are evenly distributed along their axial direction, with adjacent horizontal ribs spaced apart; the concave arc surface on the horizontal ribs is the groove wall of the limiting through groove. It also includes multiple longitudinal ribs, and two adjacent transverse ribs are connected by the longitudinal ribs; the longitudinal ribs are located on the side of the transverse ribs away from the limiting groove.

[0011] A method for replacing large-diameter overhead pipelines, employing any of the aforementioned auxiliary devices for replacing large-diameter overhead pipelines, includes the following steps: S1. Construction preparation; S1.1 Cut the new pipe to be assembled into multiple equal-length lifting pipe sections; S1.2 Erect a crane at the construction site below the end of the old pipeline furthest from the winch; S1.3 Cut and remove the upper part of the old pipe so that the remaining lower part of the old pipe forms a horizontal guide rail; S1.4 Assemble the two conveyor tables into the limiting slots near the end of the horizontal guide rail. Let the end of the horizontal guide rail furthest from the crane be the far end, and the end closest to the crane be the near end; Let the conveyor platform closest to the crane be the near-end conveyor platform a, and the other conveyor platform be the far-end conveyor platform b; S2. Start the crane to lift the first pipe section into the limiting groove of the far-end conveyor platform b, and lift the second pipe section into the limiting groove of the near-end conveyor platform a. The first hoisting pipe section is required to protrude from the far end of the horizontal guide rail and be suspended in the air by the far end conveying platform b; the far end conveying platform b is required to protrude from the near end of the horizontal guide rail and be suspended in the air by the first hoisting pipe section; the second hoisting pipe section is required to protrude from the far end of the horizontal guide rail and be suspended in the air by the near end conveying platform a; and the near end conveying platform a is required to protrude from the near end of the horizontal guide rail and be suspended in the air by the second hoisting pipe section. S3. The winch pulls the far-end conveyor b to the far end of the horizontal guide rail until the suspended end of the first hoisting pipe section is aligned vertically with the support below the far end of the horizontal guide rail; a connecting bracket is filled between the horizontal guide rail and the suspended end of the first hoisting pipe section, and the connecting bracket is fixedly connected to the horizontal guide rail and the first hoisting pipe section respectively. S4. The winch pulls the near-end conveyor a to the far end of the horizontal guide rail so that the suspended end of the second hoisting pipe section is coaxially connected with the hoisting pipe section on the far-end conveyor b. Then the first hoisting pipe section and the second hoisting pipe section are welded to form the N+1th new pipe section. S5. Drive the near-end conveyor a to reset, and drive the far-end conveyor b to move towards the near end of the horizontal guide rail until it protrudes into the N+1th new pipe segment in the direction of the near end of the horizontal guide rail. S6. Hoist the N+3rd hoisting pipe segment into the limiting groove of the near-end conveying platform a so that it protrudes from the far end of the horizontal guide rail. The near-end conveying platform a is suspended in the air. The suspended length of the new hoisting pipe segment on the near-end conveying platform a is required to be greater than the length of the N+1th new pipe segment axially protruding from the far-end conveying platform b. S7. The winch pulls the near-end workbench carrying the N+3rd hoisting pipe segment to the far end of the horizontal guide rail until the N+3rd hoisting pipe segment and the N+1th new pipe segment are coaxially spliced ​​together and then welded to form the N+2th new pipe segment. S8. Repeat steps S5-S7 until all the hoisted pipe sections are welded to form a complete new pipeline. Then, remove the near-end conveyor platform a and the far-end conveyor platform b. When removing the far-end platform, fill the space between the near end of the horizontal guide rail and the new pipeline with another connecting bracket and connect the two. The value of N is equal to the number of times steps S5-S6 are repeated; S9. Cut and recycle the horizontal guide rail between the two supports.

[0012] Furthermore, the rated lifting capacity of the crane is 16 tons; the mass of the lifting pipe section is within the rated lifting capacity of the crane.

[0013] Furthermore, steps S1.1, S1.2, and S1.3 are performed simultaneously, and step S1.4 can only be carried out after step S1.3 is completed.

[0014] Furthermore, it also includes step S10, which includes repainting the new pipeline and repairing its weld seams with anti-corrosion coating; and finally cleaning the construction site.

[0015] Compared with existing technologies, the advantages of this invention are: it provides an auxiliary device for replacing large-diameter overhead pipelines. By setting a conveyor platform with limiting grooves, the pipe section to be hoisted is positioned on it. A horizontal guide rail, formed by cutting the old pipeline, serves as the guide rail for the conveyor platform, which reciprocates axially within the conveying groove of the horizontal guide rail under the drive of a winch, thereby achieving long-distance transport of the pipe section on the roof. When replacing a new pipeline using this auxiliary device, the hoisting equipment only needs to be positioned at one end of the horizontal guide rail, eliminating the need to move it with changes in the final installation position of the pipe section. This reduces the construction site area occupied by the hoisting equipment and minimizes the impact of pipeline replacement on the production and logistics on the ground surface. This auxiliary device is particularly suitable for situations where construction site conditions are limited near the far end or middle of the old pipeline. Furthermore, the horizontal guide rail is made by axially cutting the old pipeline, enabling the reuse of the old pipeline and eliminating the need for additional horizontal guide rails, thus saving materials and construction costs.

[0016] This invention provides a method for replacing large-diameter overhead pipelines. The new pipeline is cut into multiple lifting sections, allowing for the use of cranes with smaller rated load capacities to lift these sections. This reduces crane lifting costs and occupies less space. During the pipeline construction process, the crane remains stationary away from the winch, eliminating the need to move its position, thus saving time and effort. The method also minimizes the impact on production and logistics, making it more suitable for pipeline replacement in factories where there is no crane installation area near the far end or middle of the old pipeline. Furthermore, this invention utilizes axial cutting of the old pipeline to create horizontal guide rails for the guiding conveyor platform, eliminating the need for additional horizontal guide rail manufacturing and installation. This achieves the reuse of the old pipeline, saving costs and making the process safer and more environmentally friendly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the installation structure of a pipeline in the background art; Figure 2 This is an axial side structural schematic diagram of one embodiment of the auxiliary device for replacing large-diameter overhead pipelines; Figure 3 It is along Figure 2 Schematic diagram of the main view structure in direction A; Figure 4 yes Figure 2 A schematic diagram of the axonal structure of the central conveyor; Figure 5 yes Figure 4 Enlarged structural diagram of section D in the middle; Figure 6 It is along Figure 4 Schematic diagram of the cross-sectional structure in the middle BB direction; Figure 7 This is a schematic diagram of the structure when using the construction auxiliary device for replacing large-diameter overhead pipelines according to the present invention to transport and hoist pipe sections; Figure 8 yes Figure 6 A schematic diagram of the left-side view structure; Figure 9 It is along Figure 8 Schematic diagram of the cross-sectional structure in the CC direction; Figure 10 This is a schematic diagram of the assembly structure of the new pipeline after replacement; Figure 11 yes Figure 10 Enlarged structural diagram of section E; Icons: 1-Horizontal guide rail; 11-Conveying channel; 2-Conveying platform; 21-Limiting channel; 22-Base; 221-Horizontal rib; 222-Longitudinal rib; 23-Roller; 3-Winder; 31-Drum; 32-Wire rope; 8-Pipeline; 81-Old pipeline; 82-New pipeline; 83-Lifting pipe section; 84-Connecting bracket; 90-Roof; 91-Support; 92-Limiting groove. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] Reference Figure 1-11 A construction auxiliary device for replacing large-diameter overhead pipelines includes multiple supports 91 mounted on a roof 90, and a horizontal guide rail 1 formed by cutting an old pipeline 81 horizontally, with an upward-facing conveying channel 11. The conveying channel 11 has a circular arc cross-section with a corresponding central angle less than 180°. A conveying platform 2, capable of axial reciprocating within the conveying channel 11, is provided inside the conveying channel 11. The top surface of the conveying platform 2 has an upward-facing limiting channel 21, the shape and size of which are adapted to the outer wall of the pre-lifted pipe section 83. The length direction of the limiting channel 21 is along the axial direction of the conveying channel 11. Two sets of conveying platforms 2 are provided, spaced apart along the axial direction of the conveying channel 11. The device also includes a winch 3 mounted at one end of the horizontal guide rail 1, with the rotation axis of the drum 31 on the winch 3 perpendicular to the length direction of the horizontal guide rail 1.

[0020] For ease of explanation, let the end of the horizontal guide rail 1 closest to the winch 3 be the far end and the end furthest from the winch 3 be the near end; the conveyor platform 2 closest to the near end of the horizontal guide rail 1 is the near end conveyor platform a, and the workbench 2 furthest from the near end of the horizontal guide rail 1 is the far end conveyor platform b; the support 91 below the near end of the horizontal guide rail 1 is the near end support, and the support 91 below the far end of the horizontal guide rail 1 is the far end support.

[0021] Before hoisting, the new pipe 82 is pre-cut into multiple equal-length hoisting pipe sections 83 so that the crane can complete the hoisting of the pipe sections 83 without deformation. The crane is erected on the ground near the end of the horizontal guide rail 1 away from the winch 3. After moving both conveyor platforms 2 to the side of the conveying channel 11 close to the crane, the crane is started to hoist the assembly hoisting pipe sections 83 into the limiting channels 21 of the far-end conveyor platform b and the near-end conveyor platform a respectively. It is required that the end of the hoisting pipe section 83 near the winch 3 protrudes from the conveyor platform 2 and is suspended in the air, and the end of the hoisting pipe section 83 away from the winch 3 is located in the conveying channel 11 and is spaced apart from the end face of the conveyor platform 2 away from the winch 3. First, start the winch 3 so that the wire rope 32 on it pulls the far-end conveyor platform b along the horizontal guide rail 1 axially towards the far end of the horizontal guide rail 1. The far-end conveyor platform b transports the hoisting pipe section 83 on it to the far end of the horizontal guide rail 1 and positions the suspended end of the hoisting pipe section 83 directly above the far-end support. Insert the connecting bracket 84 between the suspended end of the hoisting pipe section 83 on the far-end conveyor platform b and the wall of the conveying channel 11 and fix it to the horizontal guide rail 1 and the connecting bracket 84 respectively. Then, the wire rope 32 of the winch 3 pulls the near-end conveyor platform a along the horizontal guide rail 1 axially towards the far-end conveyor platform b so that the suspended end of the hoisting pipe section 83 on it is coaxially welded with the hoisting pipe section 83 on the far-end conveyor platform b to form the first new pipe section. First, drive the near-end conveyor platform a to reset, then drive the far-end conveyor platform b to move towards the near end of the horizontal guide rail 1 until it protrudes from the first new pipe section towards the near end of the horizontal guide rail 1. At the same time, hoist the new lifting pipe section 83 into the limiting slot 21 of the near-end conveyor platform a, so that the end of the lifting pipe section 83 near the winch 3 protrudes from the conveyor platform 2 and is suspended in the air. It is required that the suspended length of the new lifting pipe section 83 on the near-end conveyor platform a is greater than the axial protrusion length of the first new pipe section on the far-end conveyor platform b. Then, the winch 3... Pull the near-end worktable carrying the new lifting pipe segment 83 towards the far end of the horizontal guide rail 1 until the new lifting pipe segment 83 is coaxially spliced ​​with the first type of pipe segment and welded to form the second new pipe segment. Then, repeatedly drive the near-end conveyor a to reset to the initial position and drive the far-end conveyor b to move towards the near end of the horizontal guide rail 1 until it protrudes towards the near end of the horizontal guide rail 1 to form the second new pipe segment. Repeat the above operation until the last section of the lifting pipe segment 83 is welded. Then, remove the near-end conveyor a and the far-end conveyor b. Finally, cut the horizontal guide rail 1 from the support 91 to complete the replacement of the new pipe 82.

[0022] The large-diameter overhead pipeline replacement construction auxiliary device of this invention positions the hoisted pipe section 83 on a conveying platform 2 with a limiting groove 21. A horizontal guide rail 1, cut from the old pipeline 81, serves as the guide rail for the conveying platform 2. Driven by a winch 3, the conveying platform 2 moves axially back and forth within the conveying channel 11 of the horizontal guide rail 1, thereby achieving long-distance transport of the hoisted pipe section 83 on the roof 90. When replacing a new pipeline using this large-diameter overhead pipeline replacement construction auxiliary device, the hoisting equipment only needs to be positioned at one end of the horizontal guide rail 1, without needing to move with changes in the final installation position of the hoisted pipe section 83. This reduces the construction site area occupied by the hoisting equipment and minimizes the impact of pipeline replacement construction on the production logistics on the ground surface. This large-diameter overhead pipeline replacement construction auxiliary device is particularly suitable for situations where construction site conditions are limited near the far end or middle of the old pipeline 81. Furthermore, the horizontal guide rail 1 of this invention is axially cut from the old pipeline 81, enabling the reuse of the old pipeline 81 without the need for additional horizontal guide rail 1 installation, saving materials and construction costs.

[0023] The horizontal guide rail 1 is used to guide the movement of the conveyor table 2. The sidewall of the conveying groove 11 on the horizontal guide rail 1 directly contacts the conveyor table 2, causing the conveyor table 2 to reciprocate axially within it. Preferably, the central angle corresponding to the cross-section of the arc-shaped structure of the conveying groove 11 is 120°. Reducing the depth of the conveying groove 11 makes the conveyor table 2 easier to assemble and disassemble, and reducing the height of the horizontal guide rail 1 itself facilitates subsequent cutting and dismantling by operators.

[0024] The limiting groove 21 on the conveyor platform 2 is used to accommodate the hoisting pipe section 83 and position it horizontally and radially on the conveyor platform 2. The axial friction between the hoisting pipe section 83 and the groove wall of the limiting groove 21 is sufficiently large, mainly due to the weight of the pipe section 83 itself, thus ensuring that the pipe section 83 is stably arranged on the conveyor platform 2 and moves synchronously with it. The limiting groove 21 can be a U-shaped groove, a V-shaped groove, or other groove structures that are wider at the top and narrower at the bottom. Preferably, the cross-section of the limiting groove 21 is an arc segment structure with a corresponding central angle less than 180°, and the radius of the cross-section of the limiting groove 21 is the same as the radius of the outer wall of the hoisting pipe section 83. This structure of the limiting groove 21 provides surface support for the hoisting pipe section 83, preventing deformation due to a small support area.

[0025] The conveyor platform 2 is used to drive the hoisting pipe sections 83 axially on the horizontal guide rail 1, transporting multiple hoisting pipe sections 83 to designated installation positions on the roof. The winch 3 drives the drum 31 on it to rotate, pulling the steel wire rope 32 wound on the drum 31 to achieve axial drive of the conveyor platform 2. The winch 3 adopts an existing device, which is mainly used to drive the conveyor platform 2 to reciprocate axially within the conveying channel 11. The winch 3 is fixedly installed on the roof 90, or it can be fixedly installed on the support 91 on the lower side of the far end of the horizontal guide rail 1.

[0026] The conveyor platform 2 and the hoisting pipe section 83 can slide axially or move relative to each other via rollers. Preferably, the conveying table 2 includes a base 22 and a roller assembly disposed below the base 22. The limiting groove 21 is disposed on the top surface of the base 22. The roller assembly has at least three sets, with two sets of rollers symmetrically distributed on both sides of the limiting groove 21, and one set of rollers disposed on the bottom surface of the base 22. The roller assembly includes multiple rollers 23, which are evenly distributed on the base 22 along the axial direction of the limiting groove 21. Each roller 23 is located within the conveying groove 11 and rolls against the groove wall of the conveying groove 11. The rollers 23 are rotatably connected to the base 22, and their rotation axis is perpendicular to the axis of the limiting groove 21. The first arc segment determined by connecting the endpoints of multiple rollers 23 located on the same cross-section of the limiting groove 21 away from the limiting groove 21 is equal to the radius of the conveying groove 11, and the central angle corresponding to the first arc segment is smaller than the central angle corresponding to the conveying groove 11. The rollers 23 are generally arranged radially along the conveying channel 11 from the end near the limiting channel 21 to the end away from the limiting channel 21. The roller assemblies symmetrically arranged on both sides of the limiting channel 21 cooperate with the side walls of the conveying channel 11 to position the conveying platform 2 in the horizontal radial direction of the conveying channel 11. The roller assembly set on the ground of the base 22 is mainly used to bear the weight of the conveying platform 2 and the suspended pipe section 83 on it. Compared with the axial sliding fit between the conveying platform 2 and the suspended pipe section 83, the conveying platform 2 in this structure moves axially back and forth within the conveying channel 11 via the rollers 2, which is more labor-saving. When the conveying platform 2 is unloaded, it can be easily pulled axially back and forth manually. The rollers 23 can be equipped with seated bearings, and the bearing seats on the seated bearings are connected to the base 22.

[0027] The base 22 is used to install the rollers 23 and provide support for the hoisted pipe section. It can be a structure welded from sheet metal or a frame structure formed by bending and welding rectangular tubes, channel steel, or other steel materials. Specifically, the base 22 includes multiple arc-shaped horizontal ribs 221, evenly distributed along its axial direction, with adjacent horizontal ribs spaced apart. The concave arc surface of each horizontal rib 221 forms the wall of the limiting through groove 21. It also includes multiple longitudinal ribs 222, with adjacent horizontal ribs 221 connected by the longitudinal ribs. The longitudinal ribs 222 are located on the side of the horizontal ribs 221 away from the limiting through groove 21. This base 22 structure is simple, easy to manufacture, has low manufacturing cost, is lighter, and is easily driven.

[0028] A method for replacing large-diameter overhead pipelines, employing any of the above-described auxiliary devices for replacing large-diameter overhead pipelines, includes the following steps: S1. Construction preparation; S1.1 Cut the new pipe 82 to be assembled into multiple equal-length hoisting pipe sections 83; S1.2 Erect a crane at the construction site below the end of the old pipeline 81 that is away from the winch 3; S1.3 Cut and remove the upper part of the old pipe 81 so that the remaining lower part of the old pipe 81 forms a horizontal guide rail 1; S1.4 Assemble the two conveyor tables 2 into the limiting groove 21 near the end of the horizontal guide rail 1. Let the end of the horizontal guide rail 1 closest to the crane be the far end, and the end closest to the crane be the near end; Let the conveyor platform 2 closest to the crane be the near-end conveyor platform a, and the other conveyor platform 2 be the far-end conveyor platform b; S2. Start the crane to lift the first lifting pipe section 83 into the limiting channel 21 of the far-end conveyor platform b, and lift the second lifting pipe section 83 into the limiting channel 21 of the near-end conveyor platform a. The first hoisting pipe section 83 is required to protrude from the far end of the horizontal guide rail 1 and be suspended above the far end conveying platform b; the far end conveying platform b is required to protrude from the near end of the horizontal guide rail 1 and be suspended above the near end conveying platform a; the near end conveying platform a is required to protrude from the near end of the horizontal guide rail 1 and be suspended above the near end conveying platform a. S3. The winch 3 pulls the far-end conveyor b towards the far end of the horizontal guide rail 1 until the suspended end of the first hoisting pipe section 83 is aligned vertically with the support 91 below the far end of the horizontal guide rail 1; a connecting bracket 84 is filled between the suspended end of the horizontal guide rail 1 and the first hoisting pipe section 83, and the connecting bracket 84 is fixedly connected to the horizontal guide rail 1 and the first hoisting pipe section 83 respectively. S4. The winch 3 pulls the near-end conveyor a to the far end of the horizontal guide rail 1 so that the suspended end of the second hoisting pipe section 83 is coaxially connected with the hoisting pipe section 83 on the far-end conveyor b. Then the first hoisting pipe section 83 and the second hoisting pipe section 83 are welded to form the N+1th new pipe section. S5. Drive the near-end conveyor a to reset, and drive the far-end conveyor b to move towards the near end of the horizontal guide rail 1 until it protrudes into the N+1th new pipe segment in the direction of the near end of the horizontal guide rail 1. S6. Hoist the N+3rd hoisting pipe segment 83 into the limiting groove 21 of the near-end conveying platform a so that it protrudes from the far end of the horizontal guide rail 1 and is suspended in the air near the near-end conveying platform a. The suspended length of the new hoisting pipe segment 83 on the near-end conveying platform a is required to be greater than the length of the N+1th new pipe segment axially protruding from the far-end conveying platform b. S7. The winch 3 pulls the near-end workbench carrying the N+3rd hoisting pipe segment 83 to the far end of the horizontal guide rail 1 until the N+3rd hoisting pipe segment 83 and the N+1th new pipe segment are coaxially spliced ​​together and then welded to form the N+2th new pipe segment. S8. Repeat steps S5-S7 until all the hoisting pipe sections 83 are welded to form a complete new pipe 82. Then, remove the near-end conveyor a and the far-end conveyor b. When removing the far-end workbench, fill another connecting bracket 84 between the near end of the horizontal guide rail 1 and the new pipe 82 and fix the two together. The value of N is equal to the number of times steps S5-S6 are repeated; S9. Cut and reclaim the horizontal guide rail 1 between the two supports 91.

[0029] In the above construction method, the new pipeline 82 is cut into multiple hoisting pipe sections 83. The length of the hoisting pipe sections 83 is generally required to be within 3m. This allows the pipeline replacement construction to use cranes with small rated load capacities to hoist the pipe sections 83, resulting in lower crane hoisting costs, smaller hoisting area, and avoiding deformation caused by excessive length. During the pipeline construction process, the crane is always located at the end away from the winch, eliminating the need to move the crane's erection position, saving more time and effort, and reducing the construction site occupation for hoisting, thus minimizing the impact on production and logistics. It is also more suitable for pipeline replacement in factories where there is no crane erection site near the far end or middle of the old pipeline 81. The present invention also manufactures horizontal guide rails 1 for the guide conveyor platform 2 by axially cutting the old pipeline 81, eliminating the need for additional manufacturing and erection of horizontal guide rails 1, realizing the secondary use of the old pipeline 81, saving costs, and making it safer and more environmentally friendly.

[0030] Preferably, the crane is a truck crane with a rated lifting capacity of 16 tons; the mass of the lifting pipe section 83 is within the rated lifting capacity of the crane. Truck cranes are easy to erect, smaller in size than large lifting equipment such as tower cranes, occupy less lifting space, are more convenient to erect and move, are more flexible, and have lower operating costs.

[0031] Steps S1.1, S1.2, and S1.3 can be performed sequentially or simultaneously. Preferably, steps S1.1, S1.2, and S1.3 are performed simultaneously, and step S1.4 can only be started after step S1.3 is completed. Performing steps S1.1, S1.2, and S1.3 simultaneously saves construction time.

[0032] In the above steps, the lifting pipe segment 83 assembled in the limiting through groove 21 must be parallel to the center line of the limiting through groove 21 and vertically aligned. The connecting bracket 84 in step S3 can be a flat plate structure or an arc-shaped plate structure with a groove on the top surface. The connecting bracket 84 is generally made of steel and can be connected to the guide specification 1 by bolts, pins, or welding. The connecting bracket 84 is generally connected to the first lifting pipe segment 83 by welding.

[0033] Step 8, taking the first repetition of steps S5-S7 as an example, drives the near-end conveyor platform a to reset, drives the far-end conveyor platform b to move towards the near end of the horizontal guide rail 1 until it protrudes into the direction of the near end of the horizontal guide rail 1 to form the second new pipe segment; hoists the fourth lifting pipe segment 83 into the limiting groove 21 of the near-end conveyor platform a so that it protrudes into the far end of the horizontal guide rail 1 and is suspended in the air. It is required that the suspended length of the new lifting pipe segment 83 on the near-end conveyor platform a is greater than the length of the second new pipe segment axially protruding from the far-end conveyor platform b; the winch 3 pulls the near-end work platform carrying the fourth lifting pipe segment 83 towards the far end of the horizontal guide rail 1 until the fourth lifting pipe segment 83 is coaxially spliced ​​with the second new pipe segment and then welded to form the third new pipe segment. In the above construction process, the connecting support 84 is located directly above the support 91 of the original old pipe 81, and the new pipe 82 is connected to the connecting support 84 through the guide rail 1. Generally, multiple supports 91 are provided below the original guide rail 1. Therefore, during the construction process, it is necessary to fill and weld the connecting blocks 84 between the guide rail 1 on the support 91 and the hoisting pipe section 83 in a timely manner to ensure that the new pipe 82 is fixedly connected to the support 91, improve the stability and reliability of the new pipe 81, and ensure construction safety and construction quality.

[0034] Considering that relative friction will occur between the hoisted pipe section 83 and the conveyor platform 2 during the above construction process, which may easily cause paint peeling off the bottom of the newly assembled pipe 81, the method preferably includes step S10, which includes repainting the new pipe 82 and repairing its weld seams with anti-corrosion coating, and finally cleaning the construction site to ensure that the replaced new pipe 82 meets the project requirements.

[0035] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A large-diameter overhead pipeline replacement construction aid device comprising a plurality of supports (91) disposed on a roof (90), characterized in that, The horizontal guide rail (1) with the upward-opening conveying channel (11) is formed by cutting the old pipeline (81) in the horizontal direction, and the cross section of the conveying channel (11) is in a circular arc structure and the corresponding central angle is less than 180°; The conveying platform (2) is arranged in the conveying channel (11) and can reciprocate in the axial direction, and the top surface of the conveying platform (2) is provided with a limiting channel (21) with an upward opening, the shape and size of the cross section of the limiting channel (21) are matched with the outer side wall of the pre-hoisting pipe section (83), and the length direction of the limiting channel (21) is arranged along the axial direction of the conveying channel (11); The conveying platform (2) is provided with two groups, and the two groups of conveying platforms (2) are arranged in the axial direction of the conveying channel (11) and are spaced apart. The winch (3) is arranged at one end of the horizontal guide rail (1), and the rotating shaft of the winding drum (31) of the winch (3) is perpendicular to the length direction of the horizontal guide rail (1).

2. The large diameter overhead pipeline replacement construction aid of claim 1, wherein, The corresponding central angle of the cross section of the circular arc structure of the conveying channel (11) is 120°.

3. The large diameter overhead pipeline replacement construction aid of claim 1, wherein, The cross section of the limiting channel (21) is in a circular arc segment structure, and the corresponding central angle is less than 180°, and the radius of the cross section of the limiting channel (21) is the same as the radius of the outer side wall of the hoisting pipe section (83).

4. The large diameter overhead pipeline replacement construction aid of claim 1, wherein, The conveying platform (2) comprises a base (22) and a roller set arranged below the base (22), and the limiting channel (21) is arranged on the top surface of the base (22); The roller set is provided with at least three groups, and two groups of the roller sets are symmetrically arranged on both sides of the limiting channel (21), one group of the roller sets is arranged on the bottom surface of the base (22), the roller set comprises a plurality of rollers (23), the plurality of rollers (23) are uniformly arranged on the base (22) in the axial direction of the limiting channel (21), the rollers (23) are located in the conveying channel (11) and are in rolling cooperation with the groove wall of the conveying channel (11), the rollers (23) are rotationally connected with the base (22), and the rotating shaft of the rollers (23) is perpendicular to the axial direction of the limiting channel (21); The first circular arc segment determined by the connection of the plurality of rollers (23) located on the same cross section of the limiting channel (21) and away from the end point of the limiting channel (21) is equal to the radius of the conveying channel (11), and the corresponding central angle of the first circular arc segment is less than the corresponding central angle of the conveying channel (11).

5. The large diameter overhead pipeline replacement construction aid of claim 4, wherein, The base (22) comprises a plurality of horizontal ribs (221) in a circular arc structure, the plurality of horizontal ribs (221) are uniformly arranged in the axial direction, and two adjacent horizontal ribs (221) are arranged at intervals; and the concave circular surface on the horizontal rib (221) is the groove wall of the limiting channel (21); A plurality of vertical ribs (222) are arranged, two adjacent horizontal ribs (221) are connected through the vertical ribs (222), and the vertical ribs (222) are located on the side of the horizontal rib (221) away from the limiting channel (21).

6. A large-diameter overhead pipeline replacement construction method characterized by, The large-diameter overhead pipeline replacement construction auxiliary device comprises the steps of: S1, construction preparation; S1.1 cutting the new pipeline (82) to be assembled into multiple equal-length hoisting pipe sections (83); S1.2 erecting a crane on a construction site below the end of the old pipeline (81) far from the winch (3); S1.3 cutting and removing the upper part of the old pipeline (81) to form a horizontal guide rail (1) from the remaining lower part of the old pipeline (81); S1.4 assembling two conveying tables (2) into the limiting through slots (21) near the ends of the horizontal guide rail (1), wherein the end of the horizontal guide rail (1) far from the crane is defined as a far end, and the end of the horizontal guide rail (1) close to the crane is defined as a near end; wherein the conveying table (2) close to the crane is defined as a near conveying table a, and the other conveying table (2) is defined as a far conveying table b; S2, starting the crane to hoist the first hoisting pipe section (83) into the limiting through slot (21) of the far conveying table b and hoist the second hoisting pipe section (83) into the limiting through slot (21) of the near conveying table a; requiring the first hoisting pipe section (83) to protrude toward the far end of the horizontal guide rail (1) and the far conveying table b to be arranged in suspension, the far conveying table b to protrude toward the near end of the horizontal guide rail (1) and the first hoisting pipe section (83), the second hoisting pipe section (83) to protrude toward the far end of the horizontal guide rail (1) and the near conveying table a to be arranged in suspension, and the near conveying table a to protrude toward the near end of the horizontal guide rail (1) and the second hoisting pipe section (83); S3, pulling the far conveying table b toward the far end of the horizontal guide rail (1) by the winch (3) until the suspension end of the first hoisting pipe section (83) is vertically aligned with the support (91) below the far end of the horizontal guide rail (1); filling a connecting holder (84) between the horizontal guide rail (1) and the suspension end of the first hoisting pipe section (83), and fixedly connecting the connecting holder (84) with the horizontal guide rail (1) and the first hoisting pipe section (83) respectively; S4, pulling the near conveying table a toward the far end of the horizontal guide rail (1) by the winch (3) to make the suspension end of the second hoisting pipe section (83) coaxially butt joint with the hoisting pipe section (83) on the far conveying table b, and then welding the first hoisting pipe section (83) and the second hoisting pipe section (83) to form an N+1 new pipeline section; S5, driving the near conveying table a to reset and driving the far conveying table b to move toward the near end of the horizontal guide rail (1) until the N+1 new pipeline section protrudes toward the near end of the horizontal guide rail (1); S6, hoisting the N+3 hoisting pipe section (83) into the limiting through slot (21) of the near conveying table a to make it protrude toward the far end of the horizontal guide rail (1) and the near conveying table a to be arranged in suspension, and requiring the suspension length of the new hoisting pipe section (83) on the near conveying table a to be greater than the length of the N+1 new pipeline section protruding axially from the far conveying table b. S7, the winch (3) pulls the near-end workbench carrying the N+3th hoisting pipe section (83) to the far end of the horizontal guide rail (1) until the N+3th hoisting pipe section (83) is coaxially spliced with the N+1th new pipe section, and then the two are welded to form the N+2th new pipe section; S8, repeat steps S5-S7 until all hoisting pipe sections (83) are welded to form a complete new pipe (82), then remove the near-end conveying table a and the far-end conveying table b, and fill another connecting bracket (84) between the near end of the horizontal guide rail (1) and the new pipe (82) and connect the two when the far-end workbench is removed; The value of N is equal to the number of repetitions of steps S5-S6; S9, cut and recycle the horizontal guide rail (1) between the two supports (91).

7. The method of replacing a large diameter overhead pipeline according to claim 6, wherein The rated lifting capacity of the crane is 16 tons; the mass of the hoisting pipe section (83) is within the rated lifting capacity of the crane.

8. The method of replacing a large diameter overhead pipeline according to claim 6, wherein, The steps S1.1, S1.2 and S1.3 are implemented at the same time, and the S1.4 can be constructed only after the completion of the step S1.

3.

9. The method of replacing a large diameter overhead pipeline according to claim 6, wherein, Further comprising step S10, which includes repainting the new pipe (82) and anticorrosion repair of its welds; finally clean up the construction site.

Images