Gas pipeline construction method
Through scientific construction methods, including foundation reinforcement and real-time monitoring, the problems of inadequate foundation treatment and improper selection of backfill materials in traditional gas pipeline construction have been solved, the construction quality and safety have been improved, and the stable operation and environmental protection of the pipeline have been ensured.
Patent Information
- Application Number
- CN202411323202.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2024-12-06
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional gas pipeline construction methods have problems such as inadequate foundation treatment, irregular pipeline laying, and improper selection of backfill materials, which lead to safety hazards such as pipeline deformation, settlement and leakage, and seriously threaten the safety of life and property.
Scientific construction methods are adopted, including foundation reinforcement, mechanical and manual excavation method, the use of natural graded sand and gravel or gravel backfill, non-destructive testing and real-time monitoring of SCADA systems to ensure the integrity and safety of the pipeline.
It improves construction quality, reduces safety risks, ensures the long-term and stable operation of gas pipelines, reduces dust and noise pollution, and enhances the safety and environmental protection of the construction site.
Smart Images
Figure CN119084666A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of pipeline laying, in particular to a gas pipeline construction method. Background Art
[0002] With the acceleration of urbanization and the continuous growth of energy demand, the safe and efficient laying of gas pipelines has become an important part of urban infrastructure construction. As a clean energy, gas is widely used in residents' lives, industrial production, heat supply and other fields. However, due to the special nature of gas pipelines, their construction process has put forward strict requirements on construction technology, equipment and materials. The occurrence of safety accidents such as pipeline leakage and explosion not only causes economic losses, but also seriously threatens the safety of people's lives and property;
[0003] In my country, there are many problems with traditional gas pipeline construction methods, such as inadequate foundation treatment, irregular pipeline laying, improper backfill material selection, etc., which can easily lead to pipeline deformation, settlement and leakage. Therefore, a scientific, systematic and safe construction method is urgently needed to ensure the long-term stable operation of gas pipelines.
[0004] To this end, technicians in this field have proposed a gas pipeline construction method, which aims to improve the construction method, monitor the construction process in real time, improve the construction quality of the gas pipeline, and reduce safety risks. Summary of the invention
[0005] In order to solve the above technical problems, the present invention provides a gas pipeline construction method to solve the problems mentioned in the background technology.
[0006] A gas pipeline construction method specifically comprises the following steps:
[0007] S1. Foundation treatment: Before laying the gas pipeline, the foundation is reinforced and the bottom of the excavated trench is compacted layer by layer;
[0008] S2. Excavation: Digging trenches manually for earthwork sections and mechanical digging trenches for rockwork sections, with manual assistance. For manually excavated sections, the trench bottom is reserved to be 0.05-0.15m thick, and for mechanically excavated sections, the trench bottom is reserved to be 0.15-0.2m thick.
[0009] S3. Pipeline laying: After the pipeline is inspected and found to be correct, the pipes are lowered to the bottom of the trench one by one by hoisting. Metal pipes are fixed by welding or flange connection, and PE or PVC pipes are connected by hot melting or electric melting.
[0010] S4. Trench backfill: Use natural graded sand or gravel to backfill and compact to form the pipeline foundation;
[0011] S5. Pressure testing and monitoring: Use non-destructive testing technology to check the integrity of the pipeline, perform pipeline pressure testing, and integrate sensors in the pipeline system, using SCADA for real-time monitoring and remote control.
[0012] Preferably, during the foundation treatment, the surveying personnel conduct centerline measurement on the ground according to the design drawings, and lay out the trench edge line according to the requirements of the excavation slope, set corner piles and direction pile points outside the line, and make point marks to check and remove ground obstacles within the construction range.
[0013] Preferably, the foundation is reinforced by adding curing agent, lime and cement to improve the soil quality; the soft soil layer is excavated in the range of 0.5-3m, and layered excavation is adopted, and graded sand and gravel or natural sand are used as compacting materials. The compacting materials are evenly distributed on the foundation by layered filling, and local compaction is carried out by using a flat plate rammer in the trench. Layered compaction is adopted during compaction to compact each layer of compacting material.
[0014] Preferably, after the excavation operation, a drainage ditch is set around the trench and has a slope, and a water retaining dam or a diversion wall is set in the drainage ditch; when the groundwater level is high, well point dewatering is used to control the groundwater level by drilling well points around the trench and using water pumps to extract water from the well points. At the same time, a water level sensor is set to monitor changes in the water level in the trench and its surroundings.
[0015] Preferably, the trench is backfilled in layers, with each layer thickness controlled at 0.2 m. When backfilling, the two sides of the pipeline are backfilled first, keeping the backfill height on both sides the same, and then the top of the pipeline is backfilled. The backfill material is spread evenly so that there is no gap in the middle. During the backfilling process, the pipeline is wrapped with buffer material, and settlement monitoring is carried out after backfilling.
[0016] Preferably, the buffer material is a polyethylene protective plate.
[0017] Preferably, in the pressure test and monitoring, ultrasonic waves are used to detect pipeline welds and joints; sensors include but are not limited to water level sensors, pressure sensors and temperature sensors. The pressure sensor is used to monitor pressure changes in the pipeline, and the temperature sensor is used to monitor temperature changes in the pipeline. The pressure sensor is installed at the elbow of the pipeline or the outlet of the pump, and the temperature sensor is directly immersed in the fluid or measured through surface contact with the pipeline wall.
[0018] Preferably, the method also includes post-construction treatment, which is to restore the surface vegetation after construction by layered planting, first laying a layer of humus, then sowing seeds, and finally covering with a thin layer of soil to keep the soil moist and promote seed germination; and during the construction process, warning signs are installed, and during the backfilling process, the working area is regularly watered, and enclosures and sound insulation barriers are set up around the construction site, and the exposed backfill soil is covered with a shade net.
[0019] Compared with the prior art, the present invention has the following beneficial effects:
[0020] 1. The present invention conducts a comprehensive survey and assessment of the construction site, scientifically treats the foundation before construction to ensure its bearing capacity, and adopts a combination of mechanical and manual methods to carry out excavation to improve construction efficiency and ensure excavation quality; in trench backfilling, natural graded sand or gravel that meets the standards is used to prevent settlement problems caused by improper backfill materials.
[0021] 2. The present invention introduces modern monitoring technology, adopts non-destructive testing and SCADA system, so that the construction process of the pipeline can be monitored in real time, which can not only detect problems early, but also perform online monitoring in later use, providing technical guarantee for the safe operation of the pipeline.
[0022] 3. The present invention increases soil moisture by sprinkling water regularly, effectively reduces dust generation, establishes a sound insulation barrier, and reduces noise transmission. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 The figure is a flow chart of the gas pipeline construction method of the present invention. DETAILED DESCRIPTION
[0024] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0025] As attached Figure 1 As shown:
[0026] Embodiment 1: The present invention provides a gas pipeline construction method, which specifically comprises the following steps:
[0027] S1. Foundation treatment: Before laying the gas pipeline, the foundation is reinforced and the bottom of the excavated trench is compacted layer by layer;
[0028] S2. Excavation: Digging trenches manually for earthwork sections and mechanical digging trenches for rockwork sections, with manual assistance. For manually excavated sections, the trench bottom is reserved to be 0.05-0.15m thick, and for mechanically excavated sections, the trench bottom is reserved to be 0.15-0.2m thick.
[0029] S3. Pipeline laying: After the pipeline is inspected and found to be correct, the pipes are lowered to the bottom of the trench one by one by hoisting. Metal pipes are fixed by welding or flange connection, and PE or PVC pipes are connected by hot melting or electric melting.
[0030] S4. Trench backfill: Use natural graded sand or gravel to backfill and compact to form the pipeline foundation;
[0031] S5. Pressure testing and monitoring: Use non-destructive testing technology to check the integrity of the pipeline, perform pipeline pressure testing, and integrate sensors in the pipeline system, using SCADA for real-time monitoring and remote control.
[0032] During foundation treatment, surveyors conduct centerline measurements on the ground according to the design drawings, and lay out the trench edges according to the excavation slope requirements, set corner stakes and direction stakes outside the line, and make point marks to check and remove ground obstacles within the construction range.
[0033] The foundation is reinforced by adding curing agent, lime and cement to improve the soil quality; the soft soil layer is excavated in the range of 0.5-3m, and the silt soft soil that affects the stability of the roadbed is excavated by an excavator to ensure that the interference with the surrounding soil is minimized during the excavation process. Graded sand and gravel or natural sand are used as compacting materials. The compacting materials are evenly distributed on the foundation by layered filling. A flat plate is used in the trench for local compaction. Layered compaction is used during compaction to compact each layer of compacting materials. That is, for soft soil or foundations with high water content, the replacement method is used to excavate the soil that is not suitable for the foundation and replace it with sand, gravel and other soils with better bearing capacity, and the density and stability of the foundation soil are improved by tamping and compaction. In the case of insufficient bearing capacity of the foundation, the piling method is used to enhance the support capacity of the foundation. Pile foundation types include steel pipe piles and concrete piles. Foundation treatment is an important part of gas pipeline construction, which is directly related to the safety and service life of the pipeline system. It can effectively prevent the risks brought by foundation settlement and ensure the stable operation of the gas pipeline.
[0034] After the construction is completed, the pile body integrity and composite foundation inspection are generally carried out 28 days after the pile is formed, including CFG pile body inspection. During the pile forming process, sampling is carried out to make mixed material test blocks. Each pile driver makes a group (3 blocks) of 150mm×150mm×150mm test blocks in one shift, and standard maintenance is carried out to measure the compressive strength after 28 days.
[0035] After excavation, a combination of surface drainage and underground drainage is used to set up drainage ditches around the trenches, and the drainage ditches are made sloped. At the same time, water barriers or diversion walls are set in the drainage ditches. When the groundwater level is high, well point dewatering is used to control the groundwater level. Well points are drilled around the trenches, and water is pumped out of the well points using water pumps. At the same time, water level sensors are set up to monitor the changes in the water level in the trenches and surrounding areas. After each excavation to a certain depth, drainage operations are immediately carried out. When encountering the rainy season or when the groundwater level is high, drainage measures are strengthened to prevent the trenches from being flooded. The combination of surface drainage and underground drainage effectively solves the drainage problem during trench excavation, ensuring construction safety and project quality. At the same time, after mechanical excavation, the bottom of the trench is manually trimmed to ensure that the bottom of the trench is flat and free of sharp objects, creating good conditions for pipeline laying.
[0036] When laying pipelines, check whether the pipes are damaged or cracked before lifting to ensure that the quality of the pipes meets the standards; for metal pipe welding, perform non-destructive testing of the welds; for hot-melt or electric-melt connections of PE or PVC pipes, control the heating temperature and time to ensure a firm connection without leakage.
[0037] The trench is backfilled in layers, with the thickness of each layer controlled at 0.2m. The two sides of the pipeline are backfilled first, keeping the backfill height on both sides the same, and then the top of the pipeline is backfilled. The backfill material is spread evenly so that there is no gap in the middle. During the backfilling process, the pipeline is wrapped with polyethylene protective board buffer material, and settlement monitoring is carried out after backfilling.
[0038] During pressure testing and monitoring, ultrasonic waves are used to detect pipeline welds and joints; sensors include but are not limited to water level sensors, pressure sensors and temperature sensors. Pressure sensors are used to monitor pressure changes in pipelines, and temperature sensors are used to monitor temperature changes in pipelines. Pressure sensors are installed at the elbows of pipelines or at the outlets of pumps, and temperature sensors are directly immersed in the fluid or measured through surface contact with the pipeline wall. The integrated sensors monitor the pipeline operation status in real time, and remote monitoring and control are achieved through the SCADA system to improve the efficiency and safety of pipeline management.
[0039] The method also includes post-construction treatment, which is to restore the surface vegetation after construction, adopt layered planting, first lay a layer of humus soil, then sow seeds, and finally cover with a thin layer of soil to keep the soil moist and promote seed germination;
[0040] During the construction process, warning signs are installed. The appropriate type of warning signs is selected based on the importance of the pipeline and the surrounding environment. The warning signs contain clear text and graphics, and clearly indicate the location, category and emergency contact information of the pipeline to ensure a quick response when needed. Warning signs are installed at key nodes, intersections and crowded areas of the pipeline to ensure that they can fully play their warning role.
[0041] At the same time, during the backfilling process, the working area is regularly watered to increase soil moisture and effectively reduce dust generation. Fences and sound insulation barriers are set up around the construction site to block the spread of dust without affecting construction work, effectively reducing noise transmission. The exposed backfill soil is covered with a shade net to reduce wind erosion of the soil, thereby reducing dust generation.
[0042] Through the above measures, not only can the surface vegetation be effectively restored, warning signs be installed, and safety inspections be carried out along the pipeline, but environmental protection measures can also be taken during the post-construction treatment process to reduce dust and noise pollution. This not only protects the environment, but also ensures the long-term stable operation of the pipeline system.
[0043] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.
[0044] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.
[0045] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.
[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.
Claims
1. A gas pipeline construction method, It is characterized in that The specific steps include: S1. Foundation treatment: Before laying the gas pipeline, the foundation is reinforced and the bottom of the excavated trench is compacted layer by layer; S2. Excavation: Digging trenches manually for earthwork sections and mechanical digging trenches for rockwork sections, with manual assistance. For manually excavated sections, the trench bottom is reserved to be 0.05-0.15m thick, and for mechanically excavated sections, the trench bottom is reserved to be 0.15-0.2m thick. S3. Pipeline laying: After the pipeline is inspected and found to be correct, the pipes are lowered to the bottom of the trench one by one by hoisting. Metal pipes are fixed by welding or flange connection, and PE or PVC pipes are connected by hot melting or electric melting. S4. Trench backfill: Use natural graded sand or gravel to backfill and compact to form the pipeline foundation; S5. Pressure testing and monitoring: Use non-destructive testing technology to check the integrity of the pipeline, perform pipeline pressure testing, and integrate sensors in the pipeline system, using SCADA for real-time monitoring and remote control.
2. A gas pipeline construction method as claimed in claim 1, Features: During the foundation treatment, the surveying personnel conduct centerline measurement on the ground according to the design drawings, and lay out the trench edge line according to the requirements of the excavation slope, set corner piles and direction piles outside the line, and make point marks to check and remove ground obstacles within the construction scope.
3. A gas pipeline construction method as claimed in claim 1, Features: The foundation is reinforced by adding curing agent, lime and cement to improve the soil quality; the soft soil layer is excavated in a range of 0.5-3m, and a layered excavation process is adopted, and graded sand and gravel or natural sand is used as compacting material. The compacting material is evenly distributed on the foundation by a layered filling method, and a flat plate rammer is used in the trench for local compaction. Layered compaction is adopted during compaction to compact each layer of compacting material.
4. A gas pipeline construction method as claimed in claim 1, Features: After the excavation work, a drainage ditch is set around the trench and made to have a slope. At the same time, a water retaining dam or a diversion wall is set in the drainage ditch. When the groundwater level is high, well point dewatering is used to control the groundwater level. Well points are drilled around the trench and water is pumped out of the well points using water pumps. At the same time, water level sensors are set to monitor changes in the trench and surrounding water levels.
5. A gas pipeline construction method as claimed in claim 1, Features: The trench is backfilled in layers, with each layer thickness controlled at 0.2m. The backfill is done on both sides of the pipeline first, keeping the backfill height on both sides the same, and then backfilling the top of the pipeline. The backfill material is spread evenly so that there is no gap in the middle. During the backfilling process, the pipeline is wrapped with buffer material, and settlement monitoring is carried out after backfilling.
6. A gas pipeline construction method as claimed in claim 5, Features: The buffer material is a polyethylene protective plate.
7. A gas pipeline construction method as claimed in claim 1, Features: During the pressure test and monitoring, ultrasonic waves are used to detect pipeline welds and joints; sensors include but are not limited to water level sensors, pressure sensors and temperature sensors. The pressure sensor is used to monitor the pressure change of the pipeline, and the temperature sensor is used to monitor the temperature change of the pipeline. The pressure sensor is installed at the elbow of the pipeline or the outlet of the pump, and the temperature sensor is directly immersed in the fluid or measured through the pipeline wall for surface contact.
8. A gas pipeline construction method as claimed in claim 1, Features: The method also includes post-construction treatment, which is to restore the surface vegetation after the construction by adopting layered planting, first laying a layer of humus soil, then sowing seeds, and finally covering with a thin layer of soil to keep the soil moist and promote seed germination; During the construction process, warning signs are installed. During the backfilling process, the working area is watered regularly, fences and noise barriers are set up around the construction site, and the exposed backfill soil is covered with sunshade nets.