CN117803766A - Hydraulic lifting type vertical large pipeline hoisting method - Google Patents
Hydraulic lifting type vertical large pipeline hoisting method Download PDFInfo
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- CN117803766A CN117803766A CN202410006758.XA CN202410006758A CN117803766A CN 117803766 A CN117803766 A CN 117803766A CN 202410006758 A CN202410006758 A CN 202410006758A CN 117803766 A CN117803766 A CN 117803766A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000003466 welding Methods 0.000 claims abstract description 15
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000005536 corrosion prevention Methods 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/0243—Laying or reclaiming pipes on land, e.g. above the ground above ground
- F16L1/0246—Laying or reclaiming pipes on land, e.g. above the ground above ground at a certain height off the ground
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses a hydraulic lifting type vertical large-scale pipeline lifting method, and relates to the technical field of pipeline lifting. Comprising the following steps: hoisting equipment and tools are selected; positioning and paying off a pipeline in a pipe well; preparing a pipeline for hoisting; pulling the first section of pipeline to a hoisting position to keep the first section of pipeline in a vertical state; lifting and temporarily reinforcing the first section of pipeline; pulling the second section of pipeline to a hoisting position to keep the second section of pipeline in a vertical state; butt welding the first joint pipe and the second joint pipe; and hoisting the third section of pipeline into position, butt welding the third section of pipeline with the second section of pipeline according to the same method, and lifting. The invention adopts the hydraulic jack anchor, has reverse motion self-locking property, ensures that the lifting process is very safe, and can reliably lock the component at any position in the lifting process for a long time. The guide bracket and the temporary reinforcing device chain block are arranged during hoisting, so that various anti-falling installation protection devices are formed, and the safety of hoisting operation is ensured.
Description
Technical Field
The invention relates to the technical field of pipeline hoisting, in particular to a hydraulic lifting type vertical large-scale pipeline hoisting method.
Background
In the construction process of the cooling tower and the cooling water pipe of the super high-rise building, as the cooling tower is arranged on the roof, the size and the weight of the vertical pipeline of the cooling water pipe are large, and the construction environment is narrow, so that the conditions of collision and the like are easy to occur in the vertical conveying process of the pipeline, and the overall conveying operation is difficult and high in cost.
The prior art is that the pipeline is cut into small sections according to the transport means and the floor height, then transported to each floor for installation, the whole procedure is complicated, and because the pipeline is difficult to transport, the length of the intercepted pipeline is small, the required welding lines are more, the manpower and material resources are consumed greatly, and the cost is high; the hoisting safety guarantee measures are insufficient, and safety accidents are easy to occur; the pipeline needs to be transported to the pipe well at each floor, the transportation path and the space of the pipe well are small, and a certain space is reserved, so that the construction operation progress of the pipe well and the periphery can be seriously influenced.
Therefore, a hydraulic lifting type vertical large-scale pipeline lifting method is needed to solve the problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a hydraulic lifting type vertical large pipeline hoisting method.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a hydraulic lifting type vertical large pipeline hoisting method comprises the following steps:
s1: hoisting equipment and tools are selected;
s2: positioning and paying off a pipeline in a pipe well;
s3: preparing a pipeline for hoisting;
s4: pulling the first section of pipeline to a hoisting position to keep the first section of pipeline in a vertical state;
s5: lifting and temporarily reinforcing the first section of pipeline;
s6: pulling the second section of pipeline to a hoisting position to keep the second section of pipeline in a vertical state;
s7: butt welding the first joint pipe and the second joint pipe;
s8: hoisting the third section of pipeline into position, butt welding the third section of pipeline with the second section of pipeline according to the same method, and then lifting;
s9: the hoisting of the first-stage pipeline is completed, and the floor support and the guide support are permanently fixed;
s10: and installing all the layer section pipelines and the brackets according to the steps.
Preferably: s3 comprises the following steps:
s31: hoisting platform construction;
s32: constructing a floor support and a sleeve;
s33: and (5) pipeline treatment.
Preferably: the construction of the hoisting platform comprises the following steps:
s311: confirming a hoisting layer section and a hoisting point;
s312: erecting a hoisting platform and installing hoisting equipment.
Preferably: the construction of the floor support and the sleeve comprises the following steps:
s321: measuring on site, and designing a landing bracket according to the site condition;
s322: erecting a floor stand and installing a sleeve.
Preferably: the construction of the hoisting platform comprises the following steps:
s331: rust removal and corrosion prevention treatment is carried out on the pipeline;
s332: and (5) processing grooves at two ends of the pipeline.
Preferably: the guide brackets are equidistantly arranged along the vertical direction, and the distance between two adjacent guide brackets is smaller than the length of a single pipeline.
Preferably: in S4-S8, when the pipeline is lifted, the chain block zipper is connected with the lifting lug in the pipeline to be lifted, the end part of the pipeline is lifted through the chain block, and more than two guide brackets support one side of the pipeline, so that the pipeline is stable to a vertical state.
Preferably: in S4-S10, the pipeline is lifted by an erected hydraulic lifting jack and a steel strand, and the concrete steps are as follows:
s41: connecting a lifting steel strand of the hydraulic lifting jack with a lifting lug of the pipeline;
s42: after the first section of pipeline is lifted to a position with a section of pipeline space below the pipe bottom and the hoisting platform, temporarily fixing the pipeline by using a guide bracket and a temporary fixing device;
s43: pulling the second section of pipeline to a vertical hoisting position in the pipe well by using a chain block;
s44: after fixing the safety belt, constructors butt-weld the second section of pipeline with the first section of pipeline on the upper floor platform or the permanently fixed floor after being installed;
s45: then lifting the first and second pipelines to the positions at the same time, and then temporarily fixing;
s46: hoisting, welding and lifting the third section of pipeline;
s47: after the lifting of all the pipelines in the first layer section is completed, permanently fixing the pipelines with floor support brackets and guide support brackets of all floors;
s48: the other floor sections are completed sequentially according to the procedure.
Preferably: s3, installing a guide bracket and a permanent fixing bracket: the floor support sleeve for permanently fixing the pipeline is required to be installed on the floor plate in advance, the guide support for the pipeline between floors is installed in advance, the pipeline passes through the floor support for lifting during lifting, and the floor support sleeve is directly welded and fixed after the pipeline is lifted.
Preferably: s3, the communication between the upper and lower sides is smooth when the pipe well pipeline is hoisted, after the steel stranded wires are installed, the holes of each floor are plugged by using templates, only the gaps of 20mm through which the steel stranded wires pass are reserved, and when the pipeline is lifted to a floor, a layer of the pipeline is removed to prevent objects from falling; and S4, before formal lifting, firstly, testing and lifting, stopping when the pipeline is lifted 100-200 mm away from a temporary support or above the ground, checking whether the steel wire rope, the lifting appliance and the lifting lug are normal, and after safety is confirmed, continuing lifting until the pipeline is lifted in place and temporarily fixed, wherein constructors can continue to operate.
The beneficial effects of the invention are as follows:
1. the invention adopts the hydraulic jack anchor, has reverse motion self-locking property, ensures that the lifting process is very safe, and can reliably lock the component at any position in the lifting process for a long time. The guide bracket and the temporary reinforcing device chain block are arranged during hoisting, so that various anti-falling installation protection devices are formed, and the safety of hoisting operation is ensured.
2. The scheme equipment has small volume, light dead weight and large bearing capacity, is suitable for lifting large-tonnage components in a narrow space or a room, does not influence the construction of a masonry structure, and avoids secondary excavation.
3. According to the scheme, the layered sections of the pipeline are transported to the hoisting platform in a centralized manner for hoisting, so that the vertical transportation difficulty, time, manpower and material resources and transportation cost of the pipeline are reduced.
4. The scheme of the invention is characterized in that the hydraulic lifting equipment is expanded and combined, the lifting weight, span and area are not limited, the flexible rigging is adopted for bearing, the lifting height is not limited, and the hydraulic lifting equipment is suitable for various large pipelines or other components.
5. According to the scheme, the lifting platform is large in selected layer height, the length of the pipe section is large, required welding seams are reduced, manpower, material resources and cost are saved, and meanwhile attractiveness can be improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application and to provide a further understanding of the application with regard to the other features, objects and advantages of the application. The drawings of the illustrative embodiments of the present application and their descriptions are for the purpose of illustrating the present application and are not to be construed as unduly limiting the present application. In the drawings:
FIG. 1 is a flow chart of a method for hoisting a hydraulic lifting type vertical large pipeline;
fig. 2 is a diagram showing hoisting of first and second sections of pipelines in a hydraulic lifting type vertical large pipeline hoisting method according to the invention;
fig. 3 is a temporary fixing display diagram of a first section pipeline and a second section pipeline of the hydraulic lifting type vertical large pipeline lifting method;
fig. 4 is a diagram showing hoisting of first, second and third sections of pipelines in a hydraulic lifting type vertical large pipeline hoisting method according to the invention;
fig. 5 is a temporary fixing display diagram of a first, a second and a third section of pipeline in the hydraulic lifting type vertical large pipeline lifting method;
fig. 6 is an nth section pipeline hoisting display diagram of a hydraulic lifting type vertical large pipeline hoisting method provided by the invention.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe the present application and its embodiments and are not intended to limit the indicated device, element or component to a particular orientation or to be constructed and operated in a particular orientation.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1:
a hydraulic lifting type vertical large pipeline hoisting method comprises the following steps:
s1: hoisting equipment and tools are selected;
s2: positioning and paying off a pipeline in a pipe well;
s3: preparing a pipeline for hoisting;
s4: pulling the first section of pipeline to a hoisting position to keep the first section of pipeline in a vertical state;
s5: lifting and temporarily reinforcing the first section of pipeline;
s6: pulling the second section of pipeline to a hoisting position to keep the second section of pipeline in a vertical state;
s7: butt welding the first joint pipe and the second joint pipe;
s8: hoisting the third section of pipeline into position, butt welding the third section of pipeline with the second section of pipeline according to the same method, and then lifting;
s9: the hoisting of the first-stage pipeline is completed, and the floor support and the guide support are permanently fixed;
s10: and installing all the layer section pipelines and the brackets according to the steps.
Wherein, the S3 includes:
s31: hoisting platform construction;
s32: constructing a floor support and a sleeve;
s33: and (5) pipeline treatment.
Wherein, the construction of hoist and mount platform includes:
s311: confirming a hoisting layer section and a hoisting point;
s312: erecting a hoisting platform and installing hoisting equipment.
Wherein, floor stand and sleeve pipe construction include:
s321: measuring on site, and designing a landing bracket according to the site condition;
s322: erecting a floor stand and installing a sleeve.
Wherein, the construction of hoist and mount platform includes:
s331: rust removal and corrosion prevention treatment is carried out on the pipeline;
s332: and (5) processing grooves at two ends of the pipeline.
To improve reliability; the guide brackets are equidistantly arranged along the vertical direction, and the distance between two adjacent guide brackets is smaller than the length of a single pipeline.
In S4-S8, when the pipeline is lifted, the chain block zipper is connected with the lifting lug in the pipeline to be lifted, the end part of the pipeline is lifted through the chain block, and more than two guide brackets support one side of the pipeline, so that the pipeline is stable to a vertical state.
Example 2:
a hydraulic lifting type vertical large pipeline hoisting method comprises the following steps:
s1: hoisting equipment and tools are selected;
s2: positioning and paying off a pipeline in a pipe well;
s3: preparing a pipeline for hoisting;
s4: pulling the first section of pipeline to a hoisting position to keep the first section of pipeline in a vertical state;
s5: lifting and temporarily reinforcing the first section of pipeline;
s6: pulling the second section of pipeline to a hoisting position to keep the second section of pipeline in a vertical state;
s7: butt welding the first joint pipe and the second joint pipe;
s8: hoisting the third section of pipeline into position, butt welding the third section of pipeline with the second section of pipeline according to the same method, and then lifting;
s9: the hoisting of the first-stage pipeline is completed, and the floor support and the guide support are permanently fixed;
s10: and installing all the layer section pipelines and the brackets according to the steps.
Wherein, the S3 includes:
s31: hoisting platform construction;
s32: constructing a floor support and a sleeve;
s33: and (5) pipeline treatment.
Wherein, the construction of hoist and mount platform includes:
s311: confirming a hoisting layer section and a hoisting point;
s312: erecting a hoisting platform and installing hoisting equipment.
Wherein, floor stand and sleeve pipe construction include:
s321: measuring on site, and designing a landing bracket according to the site condition;
s322: erecting a floor stand and installing a sleeve.
Wherein, the construction of hoist and mount platform includes:
s331: rust removal and corrosion prevention treatment is carried out on the pipeline;
s332: and (5) processing grooves at two ends of the pipeline.
To improve reliability; the guide brackets are equidistantly arranged along the vertical direction, and the distance between two adjacent guide brackets is smaller than the length of a single pipeline.
In S4-S8, when the pipeline is lifted, the chain block zipper is connected with the lifting lug in the pipeline to be lifted, the end part of the pipeline is lifted through the chain block, and more than two guide brackets support one side of the pipeline, so that the pipeline is stable to a vertical state.
In the steps S4-S10, an erected hydraulic lifting jack and a steel strand are adopted to lift a pipeline, and the method specifically comprises the following steps:
s41: connecting a lifting steel strand of the hydraulic lifting jack with a lifting lug of the pipeline;
s42: after the first section of pipeline is lifted to a position with a section of pipeline space below the pipe bottom and the hoisting platform, temporarily fixing the pipeline by using a guide bracket and a temporary fixing device;
s43: pulling the second section of pipeline to a vertical hoisting position in the pipe well by using a chain block;
s44: after fixing the safety belt, constructors butt-weld the second section of pipeline with the first section of pipeline on the upper floor platform or the permanently fixed floor after being installed;
s45: then lifting the first and second pipelines to the positions at the same time, and then temporarily fixing;
s46: hoisting, welding and lifting the third section of pipeline;
s47: after the lifting of all the pipelines in the first layer section is completed, permanently fixing the pipelines with floor support brackets and guide support brackets of all floors;
s48: the other floor sections are completed sequentially according to the procedure.
In S3, the guide bracket and the permanent fixing bracket are installed: the floor support sleeve for permanently fixing the pipeline is required to be installed on the floor plate in advance, the guide support for the pipeline between floors is installed in advance, the pipeline passes through the floor support for lifting during lifting, and the floor support sleeve is directly welded and fixed after the pipeline is lifted.
In the step S3, the vertical communication is required to be smooth when the pipe well and the pipeline are hoisted, after the steel stranded wires are installed, the holes of all floors are plugged by using templates, only the gaps, through which the steel stranded wires pass, are reserved for 20mm, and when the pipeline is lifted to a floor, a layer of pipeline is removed to prevent objects from falling.
In the step S4, before formal lifting, firstly, the test lifting is firstly performed, the pipeline is stopped when the pipeline is lifted 100-200 mm away from a temporary support or above the ground, whether the steel wire rope, the lifting appliance and the lifting lug are normal or not is checked, after safety is confirmed, the lifting is continued until the pipeline is lifted in place and temporarily fixed, and then the constructor can continue to operate.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. The hydraulic lifting type vertical large pipeline hoisting method is characterized by comprising the following steps of:
s1: hoisting equipment and tools are selected;
s2: positioning and paying off a pipeline in a pipe well;
s3: preparing a pipeline for hoisting;
s4: pulling the first section of pipeline to a hoisting position to keep the first section of pipeline in a vertical state;
s5: lifting and temporarily reinforcing the first section of pipeline;
s6: pulling the second section of pipeline to a hoisting position to keep the second section of pipeline in a vertical state;
s7: butt welding the first joint pipe and the second joint pipe;
s8: hoisting the third section of pipeline into position, butt welding the third section of pipeline with the second section of pipeline according to the same method, and then lifting;
s9: the hoisting of the first-stage pipeline is completed, and the floor support and the guide support are permanently fixed;
s10: and installing all the layer section pipelines and the brackets according to the steps.
2. The method for hoisting a large vertical pipeline with hydraulic lifting according to claim 1, wherein S3 comprises:
s31: hoisting platform construction;
s32: constructing a floor support and a sleeve;
s33: and (5) pipeline treatment.
3. The method for hoisting the vertical large-scale pipeline by hydraulic lifting according to claim 2, wherein the construction of the hoisting platform comprises the following steps:
s311: confirming a hoisting layer section and a hoisting point;
s312: erecting a hoisting platform and installing hoisting equipment.
4. A method of lifting a vertical large pipeline with hydraulic lifting as claimed in claim 3, wherein the floor stand and casing construction comprises:
s321: measuring on site, and designing a landing bracket according to the site condition;
s322: erecting a floor stand and installing a sleeve.
5. The method for hoisting a large vertical pipeline with hydraulic lifting according to claim 4, wherein the construction of the hoisting platform comprises the following steps:
s331: rust removal and corrosion prevention treatment is carried out on the pipeline;
s332: and (5) processing grooves at two ends of the pipeline.
6. The method for hoisting a large vertical pipeline with hydraulic lifting according to claim 5, wherein the guide brackets are equidistantly arranged along the vertical direction, and the distance between two adjacent guide brackets is smaller than the length of a single pipeline.
7. The lifting method for the hydraulic lifting type vertical large pipeline according to claim 6, wherein in the step S4-S8, when the pipeline is lifted, the chain block zipper is connected with the lifting lug in the pipeline to be lifted, the end part of the pipeline is lifted through the chain block, and more than two guide brackets support one side of the pipeline to enable the pipeline to be stable to a vertical state.
8. The method for hoisting the vertical large-scale pipeline by hydraulic lifting according to claim 6, wherein in the step S4-S10, the pipeline is lifted by using an erected hydraulic lifting jack and a steel strand, specifically:
s41: connecting a lifting steel strand of the hydraulic lifting jack with a lifting lug of the pipeline;
s42: after the first section of pipeline is lifted to a position with a section of pipeline space below the pipe bottom and the hoisting platform, temporarily fixing the pipeline by using a guide bracket and a temporary fixing device;
s43: pulling the second section of pipeline to a vertical hoisting position in the pipe well by using a chain block;
s44: after fixing the safety belt, constructors butt-weld the second section of pipeline with the first section of pipeline on the upper floor platform or the permanently fixed floor after being installed;
s45: then lifting the first and second pipelines to the positions at the same time, and then temporarily fixing;
s46: hoisting, welding and lifting the third section of pipeline;
s47: after the lifting of all the pipelines in the first layer section is completed, permanently fixing the pipelines with floor support brackets and guide support brackets of all floors;
s48: the other floor sections are completed sequentially according to the procedure.
9. The method for hoisting the vertical large-scale pipeline by hydraulic lifting according to claim 1, wherein in the step S3, a guide bracket and a permanent fixing bracket are installed: the floor support sleeve for permanently fixing the pipeline is required to be installed on the floor plate in advance, the guide support for the pipeline between floors is installed in advance, the pipeline passes through the floor support for lifting during lifting, and the floor support sleeve is directly welded and fixed after the pipeline is lifted.
10. The hoisting method of the hydraulic lifting type vertical large pipeline according to claim 1, wherein in the step S3, the up-down communication is smooth when the pipeline is hoisted in a pipe well, after the steel strands are installed, the holes on each floor are plugged by using templates, only the gaps of 20mm through which the steel strands pass are reserved, and when the pipeline is lifted to a floor, a layer of the pipeline is removed to prevent objects from falling; in the step S4, before formal lifting, firstly, the test lifting is firstly carried out, the pipeline is stopped when the pipeline is lifted 100-200 mm away from a temporary support or above the ground, whether the steel wire rope, the lifting appliance and the lifting lug are normal or not is checked, after safety is confirmed, the lifting is continued until the pipeline is lifted in place and is temporarily fixed, and then the constructor can continue to operate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410006758.XA CN117803766A (en) | 2024-01-03 | 2024-01-03 | Hydraulic lifting type vertical large pipeline hoisting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410006758.XA CN117803766A (en) | 2024-01-03 | 2024-01-03 | Hydraulic lifting type vertical large pipeline hoisting method |
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| CN117803766A true CN117803766A (en) | 2024-04-02 |
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| CN202410006758.XA Pending CN117803766A (en) | 2024-01-03 | 2024-01-03 | Hydraulic lifting type vertical large pipeline hoisting method |
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