Construction and acceptance process of large-diameter bamboo winding composite pipeline

Abstract

The application discloses a large-diameter bamboo winding composite pipeline construction and acceptance process, which comprises the following steps: transporting, selecting bamboo winding composite pipelines with required specifications and quantities, and transporting the bamboo winding composite pipelines in batches by using flatbed trailers, highway or railway freight cars, wherein the transportation vehicles should meet the transportation length requirement, the suspended end of the pipe material should be less than or equal to 2 m, and there should be no hard objects such as iron nails and stones on the vehicles; hoisting, after the pipeline is transported to a construction point, the hoisting point of the pipeline should be arranged at a position 1 / 4 pipe length away from each end of the pipeline. The application has the advantages that the construction is stable and convenient, the strength of the pipeline is greatly guaranteed, a professional construction mode and standard are provided for the bamboo winding composite pipeline, the construction personnel can stably and efficiently complete the rapid laying of the bamboo winding composite pipeline, the stability of the bamboo winding composite pipeline in daily use is ensured, the quality of the bamboo winding composite pipeline is controllable and safe and reliable through the construction mode and the acceptance standard, and the bamboo winding composite pipeline can be popularized and used in similar projects.

Description

Technical Field

[0001] This invention belongs to the field of bamboo-wound composite pipe technology, specifically relating to a construction and acceptance process for large-diameter bamboo-wound composite pipes. Background Technology

[0002] The bamboo-wound pipe consists of an inner lining layer, a structural layer, and an outer protective layer, which are bonded together with an adhesive. The inner lining layer is made of resin, bamboo fiber non-woven fabric, and bamboo knitted felt; the structural layer is made of bamboo strips and amino resin; and the outer protective layer is made of resin and radiation-proof filler.

[0003] Currently, the construction and installation of bamboo-wound composite pipes lacks stable and safe construction techniques and corresponding acceptance standards. This hinders the standardized construction and use of bamboo-wound composite pipes, resulting in inconsistent quality and stability in actual safe use. Therefore, we propose a construction and acceptance process for large-diameter bamboo-wound composite pipes. Summary of the Invention

[0004] The purpose of this invention is to provide a construction and acceptance process for large-diameter bamboo-wound composite pipes to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a construction and acceptance process for large-diameter bamboo-wound composite pipes, comprising the following specific steps: Step 1: Transportation. Select the required quantity and specifications of bamboo-wound composite pipes and transport them in batches using flatbed trailers, road or rail freight cars. The transport vehicles should meet the transportation length requirements, and the suspended end of the pipe should be less than or equal to 2m. There should be no hard objects such as nails or stones on the vehicle. Step 2: Lifting. After the pipeline is transported to the construction site, lifting points should be set at 1 / 4 of the length of the pipeline at both ends. When lifting and moving the pipeline, both ends of the pipeline should be off the ground, and single-point lifting is not allowed. Step 3: Installation. Arrange the bamboo-wound composite pipes in the pipe construction pit or pipe rack, and connect adjacent pipes. During installation, if the installation length is less than the length of the whole pipe, the whole pipe should be cut to the required length and connected with the pipe section with joint. During installation, the bamboo-wound composite pipes can be connected by socket or flange. The bamboo-wound composite pipes can be connected to steel pipes, cast iron pipes and their fittings by socket or flange. The bamboo-wound composite pipes can be connected to pumps or other equipment by flange. There should be a 5mm to 15mm gap in the axial direction at the diameter change of the spigot end and the socket end. Step 4: Acceptance Pressure bearing capacity: When buried 1m deep and loaded with 90t on the ground, the maximum vertical deformation of the bamboo-wound composite pipe is less than 1%, which is far below the control standard of 3%. Pipe specifications: The pipe wall shall consist of an inner lining layer, a structural layer, and an outer protective layer. The thickness of the inner lining layer shall be greater than or equal to 1.2 mm, the minimum thickness of the structural layer shall be greater than or equal to 95% of the design thickness, the thickness of the outer protective layer shall be greater than or equal to 0.5 mm, and the insoluble content of the resin shall be greater than or equal to 92%. Application testing: The ring stiffness of the pipe should be greater than or equal to the corresponding ring stiffness grade value; the short-term failure water pressure of the pipe should be greater than or equal to 3 times its nominal pressure; and the physical and mechanical properties of the connection parts of the pipe and fittings should be greater than or equal to the corresponding properties of the connected pipe. Pressure testing: The water pressure inside the pipeline is tested using the formula Fwd,k=1.5Fwk, where Fwd,k is the standard value of the design water pressure inside the pipeline (kN / m2), and Fwk is the standard value of the nominal pressure of the pipeline (kN / m2). Pipeline strength testing: Pipeline strength is tested using the formula γ0S≤R, where γ0 is the importance coefficient of the pipeline, S is the basic combination design value of the load effect on the pipeline structure, and R is the design value of the resistance strength of the pipeline structure.

[0006] Furthermore, during pipeline transportation in step one, the bamboo-wound composite pipes are packaged with flexible packaging materials such as foamed plastic film to cover the end face and outer surface of the socket before loading.

[0007] Furthermore, the bamboo-wound composite pipes should be stacked horizontally when loaded onto the truck. Supporting wooden blocks should be placed between the pipes and the truck bed, with a spacing of less than or equal to 2m between the wooden blocks. Soft padding should be placed between the layers of the bamboo-wound composite pipes, and all pipes should be securely tied with high-strength, soft ropes.

[0008] Furthermore, in step three, when the bamboo-wound composite pipe is connected to the socket, the surfaces of the pipe socket and spigot that contact the sealing ring should be flat, smooth, free of scratches and pores. After the "O" ring is installed, the pipe end should be pressure tested at 1.5 times the working pressure.

[0009] Furthermore, when connecting the bamboo-wound composite pipe with flanges, the flanges should be concentric with the pipe, the two flanges should be parallel, the bolts should be of the same specification and installed in the same direction, the bolts should be tightened symmetrically, the tightened bolts should protrude beyond the nuts, and the gaskets, bolts and nuts of the connecting flanges should be clean.

[0010] Furthermore, when the bamboo-wound composite pipe is flexibly connected to the inspection well, if a concrete collar is used, the inner wall of the collar must be smooth, without holes or bulges, and the outer concrete collar must be constructed with cement mortar. During installation, the center position of the concrete collar inside the well wall must be aligned with the pipe axis. The rubber ring can be first placed on the designated part of the pipe spigot and then inserted into the collar together with the pipe end.

[0011] Furthermore, the concrete strength grade of the flexible connection concrete collar should not be lower than C20, the minimum wall thickness should not be less than 60mm, and the length should not be less than 240mm.

[0012] Furthermore, during pipeline installation in step three, when the pipeline crosses a highway, the rigidity level of the laid pipeline should meet the engineering requirements. The mechanical properties of pipe fittings such as flanges, tees, elbows, reducers, and couplings of bamboo composite pipes should be greater than or equal to the corresponding properties of the pipe material. The allowable deviation of the elbow direction angle is ±0.5°, and the radius of curvature R of the elbow is 1.5 times the nominal inner diameter of the pipeline.

[0013] Furthermore, the loading, unloading, on-site transportation, and trench installation of the bamboo composite pipes can be carried out manually or by crane. When hoisting, flexible ropes should be used. When using iron chains or steel cables for hoisting, rubber or other flexible materials should be filled at the contact point between the sling and the pipe. The pipes should be hoisted and unloaded gently to avoid impact or collision.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the bamboo-wound composite pipe of the present application is stable and convenient to construct, greatly ensuring the strength of the pipe, providing professional construction methods and standards for bamboo-wound composite pipes, which can help construction personnel to complete the rapid laying of bamboo-wound composite pipes stably and efficiently, ensuring the stability of bamboo-wound composite pipes in daily use. Through the construction method and acceptance standards of the present application, the bamboo-wound composite pipe has the advantages of controllable quality and safety, and can be promoted and used in similar projects. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0016] Implementation Cases A construction and acceptance process for large-diameter bamboo-wound composite pipes includes the following specific steps: Step 1: Transportation. Select the required quantity and specifications of bamboo-wound composite pipes and transport them in batches using flatbed trailers, road or rail freight cars. The transport vehicles should meet the transportation length requirements, and the suspended end of the pipe should be less than or equal to 2m. There should be no hard objects such as nails or stones on the vehicle. Step 2: Lifting. After the pipeline is transported to the construction site, lifting points should be set at 1 / 4 of the length of the pipeline at both ends. When lifting and moving the pipeline, both ends of the pipeline should be off the ground, and single-point lifting is not allowed. Step 3: Installation. Arrange the bamboo-wound composite pipes in the pipe construction pit or pipe rack, and connect adjacent pipes. During installation, if the installation length is less than the length of the whole pipe, the whole pipe should be cut to the required length and connected with the pipe section with joint. During installation, the bamboo-wound composite pipes can be connected by socket or flange. The bamboo-wound composite pipes can be connected to steel pipes, cast iron pipes and their fittings by socket or flange. The bamboo-wound composite pipes can be connected to pumps or other equipment by flange. There should be a 5mm to 15mm gap in the axial direction at the diameter change of the spigot end and the socket end. Installation and Construction: The pipe trench should be located in a stable soil layer. The width of the stable soil layer on both sides of the trench should be greater than or equal to 2.5 times the nominal inner diameter of the pipe. Any insufficient width should be reinforced. The original foundation soil at the bottom of the trench should not be disturbed. When excavating mechanically, a 200mm to 300mm soil layer should be reserved at the bottom of the trench. After manual excavation to the design elevation, the trench should be leveled. The bottom of the trench should not be soaked in water or frozen. If poor drainage causes local disturbance or water soaking at the bottom of the trench, it is advisable to backfill with natural graded gravel or lime-soil. The surface of the trench bottom should not have a thickness greater than 25mm. Hard objects such as round stones or sharp-angled gravel larger than 13mm should be removed to 0.15m to 0.2m below the design elevation when the foundation is rock, semi-rock, or gravel. Then, medium-coarse sand should be laid, leveled, and compacted. When the groundwater level along the trench is higher than the design elevation of the trench bottom, effective dewatering measures should be taken to ensure that the groundwater level is at least 0.2m below the trench bottom. The excavation width at the bottom of the pipeline trench should meet the requirements for pipe laying, backfilling, compaction, installation operations, and groundwater drainage. The minimum width b of the trench should be calculated using the following formula: b ≥ D +2 s In the formula: b - Minimum width of the groove (mm); S - Distance from the outer wall of the pipe to the wall of the trench (mm); Pipeline backfilling: Before the water pressure test, except for the joints, the soil cover height on both sides of the pipeline and above the top of the pipe should be greater than or equal to 0.5m. After the water pressure test is passed, the remaining parts of the trench should be backfilled in a timely manner. The minimum soil cover thickness above the pipe should meet the design requirements and local anti-freezing requirements. The correct backfill material should be selected for the pipeline area, and backfilling and compaction should be carried out. A sand layer with a thickness of greater than or equal to 100mm should be backfilled at the bottom of the pipeline, and the haunches at both ends of the pipe should be backfilled and compacted according to the design support angle requirements. Socket joints... The thickness of the sand layer at the axle angle should be equal to the difference between the outer diameter of the socket and the outer diameter of the spigot; before backfilling, debris such as bricks, stones, and wood blocks should be removed from the trench, and there should be no standing water in the trench; the drainage system should be operating normally, and backfilling with water is not allowed; the pipe area should be backfilled and compacted symmetrically in layers, and the backfilling and compaction of the pipe area should start simultaneously from both sides of the trench wall and gradually backfill towards the pipe. The compaction of the top of the pipe should reach the required compaction degree. The number of compaction passes for each layer of backfilling should be determined by on-site tests based on the compaction degree, compaction tools, loose-lay thickness, and moisture content; Construction protection: Paint protection; the lug supports of tie rod hangers and spring hangers should be welded according to steel structure fabrication standards and subjected to 100% penetrant or magnetic particle testing; fixed supports should be installed according to design requirements and should be fixed before the compensator is pre-stretched; the sliding surfaces of guide supports or sliding supports should be clean and flat, without any skewing or jamming; pipes and pipe supports (including supports) should not be directly bonded and fixed; between the pipe fittings (pipe clamps, pipe supports or pipe clips) of bamboo composite pipe fixed supports and the outer wall of the pipe, a rubber block or other soft pad with a thickness of not less than 3mm should be placed; when tightening the pipe clamp installation screws, a gap of about 1mm should be left to avoid damage to the pipe clamp due to thermal expansion and contraction; Lifting points should be set at 1 / 4 of the pipe length from both ends when hoisting pipes. When hoisting and moving, both ends of the pipe should be off the ground. Single-point lifting is not allowed. When hoisting pipes vertically, flexible material should be placed under the ground end during hoisting. The pipe should not slide on the ground. Pipes at the construction site should be stored on flat, soft soil on one side of the pipe trench. The ground should not have gravel or other hard, brittle materials that may damage the surface of the pipes. Wooden blocks should be used to separate layers. Step 4: Acceptance Pressure bearing capacity: When buried 1m deep and loaded with 90t on the ground, the maximum vertical deformation of the bamboo-wound composite pipe is less than 1%, which is far below the control standard of 3%. Pipe specifications: The pipe wall shall consist of an inner lining layer, a structural layer, and an outer protective layer. The thickness of the inner lining layer shall be greater than or equal to 1.2 mm, the minimum thickness of the structural layer shall be greater than or equal to 95% of the design thickness, the thickness of the outer protective layer shall be greater than or equal to 0.5 mm, and the insoluble content of the resin shall be greater than or equal to 92%. Application testing: The ring stiffness of the pipe should be greater than or equal to the corresponding ring stiffness grade value; the short-term failure water pressure of the pipe should be greater than or equal to 3 times its nominal pressure; and the physical and mechanical properties of the connection parts of the pipe and fittings should be greater than or equal to the corresponding properties of the connected pipe. Pressure testing: The water pressure inside the pipeline is tested using the formula Fwd,k=1.5Fwk, where Fwd,k is the standard value of the design water pressure inside the pipeline (kN / m2), and Fwk is the standard value of the nominal pressure of the pipeline (kN / m2). Pipeline strength testing: Pipeline strength is tested using the formula γ0S≤R, where γ0 is the importance coefficient of the pipeline, S is the basic combination design value of the load effect on the pipeline structure, and R is the design value of the resistance strength of the pipeline structure. After installation, bamboo composite pipes should undergo a water pressure test promptly. Unless otherwise specified in the design, the length of the pipe section for the water pressure test should not exceed 1 km. For pipes that cannot be tested in sections, the test pipe length should be determined based on the specific project conditions. The water pressure test for bamboo composite pipes can be divided into a pre-test and a main test phase. The pressure drop of the pipe should meet the design requirements. The water pressure test for bamboo composite pipes should meet the following requirements: Before the water pressure test, the bamboo composite pipe should be filled with water, left for 24 hours, then vented, and then filled with water again for the test. The water pressure test for bamboo composite pipes should be conducted at 1.25 to 1.5 times the nominal pressure. Pre-test phase: Slowly increase the water pressure in the pipe to the test pressure and stabilize it for 30 minutes. If there is a pressure drop during this period, water can be added to replenish the pressure, but it should not exceed the test pressure. If leaks or damage are found at the pipe joints, the cause should be identified and appropriate measures taken before retesting. Main test phase: Stop water injection and pressurization, stabilize for 15 minutes, and when the test pressure reaches 1.25 times the nominal pressure, stabilize for 30 minutes. The allowable pressure drop should not exceed 0.02 MPa. Then reduce the test pressure to the nominal pressure and maintain constant pressure. After 30 minutes, conduct a visual inspection. If there is no leakage, the water pressure test is qualified. If the water pressure test fails, the cause should be investigated, and the unit should be reinstalled or the leak should be plugged before retesting until it is qualified. After the completion inspection and acceptance are passed, a completion acceptance record should be filled out; after the completion acceptance, the construction unit should file all design, construction and acceptance documents and materials.

[0017] In step one, during pipeline transportation, the bamboo-wound composite pipe is packaged with flexible packaging materials such as foamed plastic film to cover the end face and outer surface of the socket before loading.

[0018] When loading the bamboo-wound composite pipes, they should be stacked horizontally. Supporting wooden blocks should be placed between the pipes and the truck bed, with a spacing of less than or equal to 2m between the wooden blocks. Soft padding should be placed between the layers of the bamboo-wound composite pipes, and all pipes should be securely tied with high-strength, soft ropes.

[0019] In step three, when the bamboo-wound composite pipe is connected to the socket, the surfaces of the pipe socket and spigot that contact the sealing ring should be flat, smooth, free of scratches and pores. After the "O" ring is installed, the pipe end should be pressure tested at 1.5 times the working pressure.

[0020] When connecting the bamboo-wound composite pipe with flanges, the flanges should be concentric with the pipe, the two flanges should be parallel, the bolts should be of the same specification and installed in the same direction, the bolts should be tightened symmetrically, the tightened bolts should protrude beyond the nuts, and the gaskets, bolts and nuts of the connecting flanges should be clean.

[0021] When the bamboo-wound composite pipe is flexibly connected to the inspection well, if a concrete collar is used, the inner wall of the collar must be smooth and free of holes or bulges. The outer concrete collar must be constructed with cement mortar. During installation, the center of the concrete collar inside the well wall must be aligned with the pipe axis. The rubber ring can be first placed on the designated part of the pipe spigot and then inserted into the collar together with the pipe end.

[0022] The concrete strength grade of the flexible connection concrete collar should not be lower than C20, the minimum wall thickness should not be less than 60mm, and the length should not be less than 240mm.

[0023] During the pipeline installation in step three, when the pipeline crosses a highway, the rigidity level of the laid pipeline should meet the engineering requirements. The mechanical properties of the pipe fittings such as flanges, tees, elbows, reducers and tie joints of the bamboo composite pipe should be greater than or equal to the corresponding properties of the pipe material. The allowable deviation of the elbow direction angle is ±0.5°, and the radius of curvature R of the elbow is 1.5 times the nominal inner diameter of the pipeline.

[0024] The loading, unloading, on-site transportation, and installation in the trench of the bamboo composite pipe can be carried out manually or by crane. When hoisting, flexible ropes should be used. When using iron chains or steel cables for hoisting, rubber or other flexible materials should be filled at the contact point between the hoisting rope and the pipe. The pipe should be hoisted and placed gently during loading and unloading to avoid impact or collision.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A construction and acceptance process for large-diameter bamboo-wound composite pipes, characterized in that, The specific steps include the following: Step 1: Transportation. Select the required quantity and specifications of bamboo-wound composite pipes and transport them in batches using flatbed trailers, road or rail freight cars. The transport vehicles should meet the transportation length requirements, and the suspended end of the pipe should be less than or equal to 2m. There should be no hard objects on the vehicle. Step 2: Lifting. After the pipeline is transported to the construction site, lifting points should be set at 1 / 4 of the length of the pipeline at both ends. When lifting and moving the pipeline, both ends of the pipeline should be off the ground, and single-point lifting is not allowed. Step 3: Installation. Arrange the bamboo-wound composite pipes in the pipe construction pit or pipe rack, and connect adjacent pipes. During installation, if the installation length is less than the length of the whole pipe, the whole pipe should be cut to the required length and connected with the pipe section with joint. During installation, the bamboo-wound composite pipes can be connected by socket or flange. The bamboo-wound composite pipes can be connected to steel pipes, cast iron pipes and their fittings by socket or flange. The bamboo-wound composite pipes can be connected to pumps or other equipment by flange. There should be a 5mm to 15mm gap in the axial direction at the diameter change of the spigot end and the socket end. Step 4: Acceptance Pressure bearing capacity: When buried 1m deep and loaded with 90t on the ground, the maximum vertical deformation of the bamboo-wound composite pipe is less than 1%, which is far below the control standard of 3%. Pipe specifications: The pipe wall shall consist of an inner lining layer, a structural layer, and an outer protective layer. The thickness of the inner lining layer shall be greater than or equal to 1.2 mm, the minimum thickness of the structural layer shall be greater than or equal to 95% of the design thickness, the thickness of the outer protective layer shall be greater than or equal to 0.5 mm, and the insoluble content of the resin shall be greater than or equal to 92%. Application testing: The ring stiffness of the pipe should be greater than or equal to the corresponding ring stiffness grade value; the short-term failure water pressure of the pipe should be greater than or equal to 3 times its nominal pressure; and the physical and mechanical properties of the connection parts of the pipe and fittings should be greater than or equal to the corresponding properties of the connected pipe. Pressure detection: via F wd , k =1.5F wk The formula detects the water pressure inside the pipe, and F wd , k Standard value of internal water pressure in pipeline design (kN / m) 2 ), F wk The nominal pressure standard value of the pipeline (kN / m) 2 ); Pipeline strength testing: Pipeline strength is tested using the formula γ0S≤R, where γ0 is the importance coefficient of the pipeline, S is the basic combination design value of the load effect on the pipeline structure, and R is the design value of the resistance strength of the pipeline structure. During pipeline transportation in step one, the bamboo-wound composite pipe should be packaged with flexible packaging material on the end face and outer surface of the socket before loading. When loading the bamboo-wound composite pipes, they should be stacked horizontally. Supporting wooden blocks should be added between the pipes and the truck bed, with a spacing of less than or equal to 2m. Soft padding should be added between the layers of bamboo-wound composite pipes, and all pipes should be securely tied with high-strength, soft ropes. In step three, when the bamboo-wound composite pipe is connected to the socket, the surfaces of the pipe socket and spigot that contact the sealing ring should be flat, smooth, free of scratches and pores. After the "O" ring is installed, the pipe end should be pressure tested at 1.5 times the working pressure. When connecting the bamboo-wound composite pipe with flanges, the flanges should be concentric with the pipe, the two flanges should be parallel, the bolts should be of the same specification and installed in the same direction, the bolts should be tightened symmetrically, the tightened bolts should protrude beyond the nuts, and the gaskets, bolts and nuts of the connecting flanges should be clean. When the bamboo-wound composite pipe is flexibly connected to the inspection well, if a concrete collar is used, the inner wall of the collar must be smooth and free of holes or bulges. The outer concrete collar must be constructed with cement mortar. During installation, the center of the concrete collar inside the well wall must be aligned with the pipe axis. The rubber ring can be first placed on the designated part of the pipe spigot and then inserted into the collar together with the pipe end. The concrete strength grade of the flexible connection concrete collar should not be lower than C20, the minimum wall thickness should not be less than 60mm, and the length should not be less than 240mm. During the pipeline installation in step three, when the pipeline crosses a highway, the rigidity level of the laid pipeline should meet the engineering requirements. The mechanical properties of the pipe fittings such as flanges, tees, elbows, reducers and couplings of bamboo composite pipes should be greater than or equal to the corresponding properties of the pipe material. The allowable deviation of the elbow direction angle is ±0.5°, and the radius of curvature R of the elbow is 1.5 times the nominal inner diameter of the pipeline. The loading, unloading, on-site transportation, and trench installation of the bamboo composite pipes can be carried out manually or by crane. When hoisting, flexible ropes should be used. When using iron chains or steel cables for hoisting, rubber or other flexible materials should be filled at the contact point between the sling and the pipe. The pipes should be hoisted and unloaded gently to avoid impact or collision.