33 results about "Pipe layer" patented technology

The utility model discloses an antistatic composite steel pipe with an epoxy resin coating, and belongs to the technical field of composite steel pipes. Comprising a first layer, a second layer, a third layer and a fourth layer which are sequentially combined from inside to outside, the first layer is a metal base pipe layer, the metal base pipe layer is a base body supporting structure of the whole composite steel pipe, the second layer is a transition combination layer, the transition combination layer is made of epoxy resin materials, and the fourth layer is made of epoxy resin materials. Wherein the third layer is a conductive net-shaped layer, the conductive net-shaped layer is formed by compounding carbon fibers and graphene according to the mass ratio of 3: 1, and through the arrangement of the conductive net-shaped layer, when a conveying medium generates static electricity, charges can be quickly guided out, so that the static electricity can be quickly discharged; the surface potential of the pipeline is lower than the safety threshold value of the explosion dangerous environment, the carbon fiber and graphene compounded structure of the conductive net-shaped layer can further inhibit electrochemical corrosion, and the service life of the composite steel pipe is effectively prolonged.

The application discloses a shearing pin embedded outer package super high performance concrete-steel pipe concrete swing bridge pier, which is applied to a bridge and comprises a bearing platform and a composite pier column arranged on the bearing platform, a shearing resistance assembly is embedded in the lower part of the composite pier column and matched with the bearing platform, and a UHPC layer of the composite pier column and a steel pipe layer-concrete column (steel pipe concrete CFST) form a swing bridge pier (UHPC-CFST swing pier); this makes the scheme capable of utilizing UHPC and CFST to improve the toughness of the body, and capable of solving the swing rotation and shearing limiting contradiction of the bridge pier system through a connecting structure; the scheme improves the impact resistance and compression crushing resistance through the collaborative stress of the UHPC shell and the internal CFST, realizes the compatibility of high shearing bearing capacity and excellent self-resetting capacity through the 'limiting translation and releasing rotation' mechanism of the CFST shearing pin and the steel sleeve ring cooperation, and can solve the problems of insufficient interface shearing capacity of the existing swing bridge pier under strong earthquakes and impact loads and easy compression crushing of the pier bottom.

The utility model relates to the technical field of pressure pipes, in particular to a steel-plastic composite pressure pipe which comprises an inner plastic layer and a first hot melting layer sleeved on the outer wall of the inner plastic layer, a steel pipe layer sleeved on the outer wall of the first hot melting layer, a plurality of protrusions arranged on the outer wall of the steel pipe layer, and a second hot melting layer sleeved on the outer wall of the steel pipe layer. Grooves are formed in the positions, corresponding to the protrusions, of the inner wall of the second hot melting layer, an outer plastic layer is arranged on the outer wall of the second hot melting layer, and reinforcing wires are arranged in the pipe wall of the outer plastic layer. According to the steel-plastic composite pressure pipe, the inner plastic layer and the steel pipe layer are combined, the overall extrusion resistance is improved, the two sides of the steel pipe layer are matched with the first hot melting layer and the second hot melting layer, the steel pipe layer is additionally arranged to be tightly attached to the inner plastic layer and the outer plastic layer, and when pipeline combination connection is conducted, the first hot melting layer and the second hot melting layer are bonded in a hot melting fit mode; and reinforcing wires are matched in the outer plastic layer, so that the toughness of the overall structure is further improved, and the overall service life is prolonged.

The application relates to the technical field of wind power tower construction, in particular to a new type of reinforced UHPC-concrete-steel pipe combined wind power tower, which comprises a plurality of assembling modules; each assembling module comprises a UHPC layer, a concrete intermediate layer and an inner steel pipe layer; the UHPC layer is the outermost layer structure, and is internally configured with outer layer steel bars for enhancing the overall crack resistance and durability; the inner steel pipe layer is the innermost layer structure; the concrete intermediate layer is located between the UHPC layer and the inner steel pipe layer; the concrete intermediate layer comprises ordinary concrete and steel bar trusses for improving the overall structural integrity and stress performance. The UHPC layer is configured with outer layer steel bars, the overall crack resistance and durability are improved, the concrete intermediate layer comprises steel bar trusses, the overall structural integrity and stress performance are improved, and the inner steel pipe layer serves as the inner layer structure and cooperates with each layer to jointly enhance the overall performance of the tower.

The invention relates to the field of pipes, in particular to a suspension type sealing connection structure and a pipeline connection unit. Comprising a spigot section, a sealing ring and a bellmouth section used for bearing the spigot section. The socket section is provided with an anti-disengaging groove and a sealing matching section used for being matched with a sealing ring. The spigot section comprises an inner pipe layer and an outer pipe layer, the two axial ends of the outer pipe layer are integrally connected with the inner pipe layer, and a cavity is formed between the inner pipe layer and the outer pipe layer, so that the main body part of the outer pipe layer is separated from the inner pipe layer; the main body part of the outer pipe layer is provided with concave-convex alternate corrugated sections and clamping parts clamped with the anti-falling grooves, one wave trough in each corrugated section is a sealing mounting groove used for mounting a sealing ring, and the sealing ring is mounted in the sealing mounting groove; in the butt joint process of the spigot section and the socket section, the corrugated section can drive the sealing ring to deviate so that the sealing ring can be centered. The sealing performance can be improved.

The invention discloses a method for breaking and replacing a large-diameter waste concrete sewage pipeline. The method comprises the steps that small guide pipe grouting reinforcement is conducted in a top soil body of the sewage pipeline to be broken; each pipe section of the sewage pipeline is divided into a plurality of pipe sections, each pipe section is divided into a plurality of pipe layers in the cross section direction of the pipe section, and the pipe layers comprise a pipe bottom layer, a pipe middle layer and a pipe top layer; the pipe sections are sequentially broken in the length direction of the sewage pipeline, when the pipe sections are broken, the pipe bottom layer, the pipe middle layer and the pipe top layer are broken one by one from bottom to top, and after the lower pipe layer is broken, aerated blocks are built in situ to form a top returning layer, so that the top returning layer is supported on the upper pipe layer; and the gaps of the aerated blocks on the top layer are grouted, so that the aerated blocks on the top layer are reinforced and bonded into a whole. The problems that before underground soil pressure balance pipe jacking engineering construction, underground obstacles such as underground waste sewage pipelines cannot cut a cutter head, the pressure of a soil bin cannot be maintained, and after the sewage pipelines are broken, ground collapse is likely to be caused are solved.

There is disclosed a flexible pipe comprising a pipe body comprising first and second pipe layers. The first pipe layer is a composite pipe layer formed of a composite comprising a reinforcement embedded in a thermoplastic matrix material. The pipe further comprises an end fitting to which a first end of the pipe body is connected, the end fitting comprising a tubular connector member concentric to the pipe body. A length of the pipe body at the first end is free of the second pipe layer so exposing the first pipe layer to the tubular connector member to enable direct contact therebetween.

The invention discloses a multi-layer pipe layering test device and a test method. The multi-layer pipe layering test device comprises a sample clamp part, a test operation part and a test data statistics part, the sample clamp part comprises a clamp fixing plate, a left clamping mechanism and a right clamping mechanism which are symmetrically arranged left and right are arranged on the clamp fixing plate, the left clamping mechanism is used for clamping and fixing a clamped part of the first pipe body layer, and the right clamping mechanism is used for clamping and fixing a clamped part of the second pipe body layer; the test operation part comprises a bottom plate, a front-back moving mechanism is arranged on the bottom plate, and the test data statistics part is installed on the front-back moving mechanism and is driven by the front-back moving mechanism to move front and back; the front-back testing mechanism comprises a probe and a tester, the probe is installed on the tester, and the probe faces forwards and points to a tested position of the sample piece; and the probe is used for testing, and related data are displayed on the tester. According to the invention, the connection firmness between layers of the multi-layer pipe can be rapidly measured, and the operation is simple and convenient.

Multi-layer pipe and method of manufacturing a multi-layer pipe A multi-layer pipe comprising a pipe body extending between first and second ends of the pipe, the pipe body having a first pipe layer and a second pipe layer disposed about the first pipe layer. The pipe further comprising a vent strip intermediate the first and second pipe layers and extending between the first and second ends of the pipe, the vent strip comprising one or more fluid passageways extending the entire length of the vent strip.

A flexible pipe and a method of manufacturing a flexible pipe, the flexible pipe comprising a pipe body comprising first and second pipe layers. The pipe body delimits a bore for conveying a fluid, e.g., a fluid relating to oil and gas operations or mining operations, along the length thereof and the first pipe layer is disposed radially inward of the second pipe layer. The flexible pipe further comprises an end fitting to which a first end of the pipe body is connected. The end fitting comprises a tubular connector member concentric to the pipe body and disposed intermediate the first and second pipe layers.

This invention discloses a telescopic water supply and drainage pipe for emergency rescue, comprising an outer telescopic water supply pipe, an inner telescopic water supply pipe, a rear-end guide sealing and silt removal assembly, and a front-end guide dust removal assembly. The rear-end guide sealing and silt removal assembly is welded to the inner pipe via a rear-end guide piston; the front-end guide dust removal assembly is welded to the outer pipe via a support port of the front-end guide support. This invention, through its rear-end guide sealing and silt removal and front-end guide dust removal structures, solves the problem of existing telescopic water supply and drainage pipes for emergency rescue where silt and other impurities easily enter between the inner and outer pipe layers, damaging the pipe wall and sealing guide components. Furthermore, the telescopic water supply pipe of this invention offers significantly improved reliability.

This utility model discloses a corrosion-resistant prestressed concrete pipe pile for soft soil foundations, relating to the field of pile foundation technology. The corrosion-resistant prestressed concrete pipe pile for soft soil foundations includes a pile body, a pile tip, a pile cap, and prestressing tendons. The pile body includes a buffer layer, an anti-corrosion layer, and a steel pipe layer distributed radially from the outside to the inside. A pouring cavity for concrete is formed within the steel pipe layer, and a reinforcing cage is installed within the pouring cavity. The pile tip has a pointed end and a connecting end at opposite ends, connected to the bottom of the steel pipe layer via a connecting plate. The pile cap is connected to the top of the steel pipe layer, and a grouting hole communicating with the pouring cavity is opened on the pile cap. The prestressing tendons are inserted within the reinforcing cage, extending axially along the pile body, and are connected between the pile cap and the connecting plate. The concrete, reinforcing cage, and prestressing tendons form an integrated load-bearing structure, improving the structural strength of the pile body. The buffer layer prevents the anti-corrosion layer from wearing away during pile driving, extending the service life of the pipe pile.

There is disclosed a flexible pipe comprising a pipe body comprising first and second pipe layers. The pipe body delimits a bore for conveying a fluid, e.g., a fluid relating to oil and gas operations or mining operations, along the length thereof and the first pipe layer is disposed radially inward of the second pipe layer. The flexible pipe further comprises an end fitting to which a first end of the pipe body is connected. The end fitting comprises a tubular connector member concentric to the pipe body and disposed intermediate the first and second pipe layers. There is also a method of manufacturing a flexible pipe.

The utility model discloses an anti-stripping permeation steel-plastic composite pipe. Relates to the technical field of composite pipe body equipment and comprises a composite pipe body, the composite pipe body comprises a steel pipe layer and an inner plastic pipe located on the inner side wall of the steel pipe layer, connecting flanges are arranged at the two ends of the steel pipe layer, and connecting assemblies attached to the inner side wall of the inner plastic pipe are arranged on the sides, away from the composite pipe body, of the connecting flanges. The connecting flanges are arranged at the two ends of the steel pipe layer, the connecting assemblies attached to the inner side walls of the inner plastic pipes are arranged on the sides, away from the composite pipe bodies, of the connecting flanges, the connecting assemblies support the inner plastic pipes of the two adjacent spliced composite pipe bodies, and the bonding positions of the inner plastic pipes of the composite pipe bodies and the steel pipe layer are prevented from being corroded. The inner plastic pipe and the steel pipe layer are completely stripped to form a gap, so that the corrosion speed of gas or liquid in the pipe to the steel pipe layer is accelerated, and the damage speed of the steel-plastic composite pipe is reduced.

The utility model relates to the technical field of stainless steel hoses, and discloses a multi-layer composite underground hydraulic control stainless steel hose device which comprises a corrugated pipe layer, an inner layer conveying pipe is arranged on the inner layer of the corrugated pipe layer, a reinforcing layer is arranged on the outer portion of the corrugated pipe layer, and an outer layer is arranged on the outer portion of the reinforcing layer. The left end of the corrugated pipe layer is fixedly connected with a connector, and a hydraulic control assembly is fixedly arranged at the right end of the outer layer. The inner-layer conveying pipe is made of a 316L stainless steel material, and by means of the excellent corrosion resistance and the low-resistance inner wall, stable conveying of underground fluid is ensured, energy consumption is reduced, and conveying safety is improved; the U-shaped corrugated structure of the corrugated pipe layer can effectively absorb stress generated by vibration and geological displacement of underground equipment, the axial compensation capacity is high, the hose is prevented from being damaged by external force, the reinforcing layer and the outer layer achieve cooperative protection, and the reinforcing layer woven by high-strength stainless steel wires endows the hose with excellent compression resistance and impact resistance.

The utility model provides a kind of support structure of flat round widening ground passage, including advance pipe layer, primary lining layer, secondary lining layer, supporting mechanism, water diversion mechanism, advance pipe layer includes several groups of support guide pipe, several groups of support guide pipe are interval setting along the excavation direction of ground passage, each support guide pipe is inserted into the excavation side wall of ground passage in inclined shape, primary lining layer covers the excavation side wall of ground passage and fits, secondary lining layer covers the excavation side wall and bottom surface of ground passage, and with the inner wall of primary lining layer fits, supporting mechanism includes two longitudinal beams and several struts, two longitudinal beams are supported by several struts, and form support to the side wall section of secondary lining layer, water diversion mechanism includes two water diversion channels and several water diversion pipes, water diversion pipe is divided into two groups, one end of each group water diversion pipe is communicated with the space between waterproof layer and primary lining layer, the other end is communicated with corresponding water diversion channel.The utility model is simple in structure, stable, and permanent support can be formed for flat round widening ground passage.

The utility model relates to new energy engineering technical field discloses a cooling water pipe arrangement structure suitable for fan foundation, include: ring pipe subassembly, ring pipe subassembly sets up in the basis main part, and is located the outside of preburied anchor bolt ring, and ring pipe subassembly includes a plurality of interval settings ring pipe layer along fan foundation height direction, and the water inlet and water outlet of each ring pipe layer all are located the outer surface of basis main part, spiral pipe subassembly, spiral pipe subassembly sets up in the basis main part, and is located the inside of preburied anchor bolt ring, and the water inlet and water outlet of spiral pipe subassembly all are located the outer surface of basis main part. The cooling water pipe arrangement structure suitable for fan foundation provided by the utility model can be well matched with the reinforcing bar arrangement form of fan foundation, simplifies the fixed mode, and effectively avoids the area that steel bar is dense, namely preburied anchor bolt ring, thereby reduces the difficulty of the layout of cooling water pipe, improves construction efficiency and reliability.

The present application relates to the technical field of composite pipe, in particular to a composite pipe connecting structure, an injection mold and an implementation method, the composite pipe connecting structure comprises a composite pipe, the composite pipe is provided with a spiral reinforcing rib protruding outward, the composite pipe is internally provided with a steel pipe layer, the two ends of the composite pipe are cross sections, the cross sections are injection molded with flange connection type pipe fittings, the flange connection type pipe fittings wrap the outside, the inside and the end of the cross section; the minimum outer diameter of the tubular part of the flange connection type pipe fitting is greater than the maximum diameter of the highest point of the spiral reinforcing rib of the composite pipe, and the tubular length is greater than the pitch of the spiral reinforcing rib; the composite pipe connecting structure avoids the problem that the composite pipe inner wall and the flange connection type pipe fitting may crack at the fusion position, and the steel pipe in the composite pipe will not be exposed; the injection mold uses a core, avoids the overflow problem, and facilitates the taking out of the product after the flange connection type pipe fitting is injection molded.

The utility model discloses a kind of new and old outlet box culvert connecting structure of different caliber, belong to the technical field of pump station engineering construction, including connecting piece, old box culvert and newly-built box culvert, the connecting piece is connected between old box culvert and newly-built box culvert, the connecting piece includes sleeve pipe, the both sides of sleeve pipe are fixedly connected with buffer pipe sleeve, the end of buffer pipe sleeve is fixedly connected with sealing pipe layer, the end of sealing pipe layer is fixedly connected with link component. The utility model is connected between new and old box culvert using connecting piece, hoist prefabricated sleeve pipe to excavation area, align old box culvert interface, sleeve pipe one end is inserted into old box culvert interface, using support device fixed sleeve pipe, ensure its position accurate, stable.

The utility model discloses a high-strength maritime pipe for deep sea, which comprises a composite pipeline and a connecting component for connecting the composite pipeline, the composite pipeline is sequentially provided with an inner pipe layer, a V-shaped corrugated pipe layer and an outer pipe layer from inside to outside, and gaps between the V-shaped corrugated pipe layer and the inner pipe layer and between the V-shaped corrugated pipe layer and the outer pipe layer are filled with first filler. The connecting assembly comprises a connecting sleeve and a closed pipe, a plurality of through grooves are sequentially formed in the annular face of the connecting sleeve in the circumferential direction of the connecting sleeve, the through grooves cover the abutting position of the pair of connected composite pipelines, the outer side of the connecting sleeve is sleeved with the closed pipe, and the space between the connecting sleeve and the closed pipe is filled with second filler. According to the composite pipeline, the V-shaped corrugated pipe layer with good bending resistance is arranged, the first filler is filled in the composite pipeline, and the composite pipeline can be supported between the outer pipe layer and the inner pipe layer through the V-shaped corrugated pipe layer, so that the deformation resistance of the outer pipe layer and the inner pipe layer is enhanced, and the composite pipeline can stably work in a high-pressure environment.

A pipe layer attachment for an excavator includes a winch configured to wind and unwind a cable having a hook attached thereto. The pipe layer attachment also includes a pipe layer boom configured to mount onto a boom of the excavator as a cantilever with the pipe layer boom extending beyond an end of the boom. The pipe layer boom is configured to be connected to an arm attachment pin connection of the boom and an arm cylinder pin connection of the boom.

A multi-layer pipe comprising a pipe body extending between first and second ends of the pipe, the pipe body having a first pipe layer and a second pipe layer disposed about the first pipe layer. The pipe further comprising a vent strip intermediate the first and second pipe layers and extending between the first and second ends of the pipe, the vent strip comprising one or more fluid passageways extending the entire length of the vent strip.

A system for determining the angular position of a pipe-laying boom is disclosed. The system comprises a connection, an angle sensor, and a control unit. The connection includes a first arm configured to be attached to a frame of the pipe-laying machine, a second arm configured to be coupled to the boom, and a pivot joint that pivots between the first and second arms. The angle sensor is positioned at the pivot point. The angle sensor is configured to detect a pivot angle between the first and second arms. The control unit is configured to determine the angular position of the boom relative to the pipe-laying machine frame based on this pivot angle.

The utility model discloses an anti-freezing and anti-cracking fire-fighting pipeline structure suitable for a low-temperature environment, relates to the technical field of pipelines, and aims to solve the technical problem that an existing fire-fighting pipeline is poor in anti-freezing and anti-cracking effect. An anti-freezing anti-cracking fire-fighting pipeline structure suitable for a low-temperature environment comprises an outer pipe layer, a heat preservation layer and an inner pipe layer, the inner pipe layer is located in the outer pipe layer, the heat preservation layer is located between the outer pipe layer and the inner pipe layer, a rubber pipe layer is arranged on the inner wall of the inner pipe layer, and a plurality of sets of grooves are formed in the inner wall of the rubber pipe layer at equal intervals; a plurality of groups of buffer cavities are formed in the wall layer of the rubber pipe layer at equal intervals; a rubber reinforcing strip is arranged in the buffer cavity and comprises a rubber outer ring, and an inner cavity of the rubber outer ring is of a hexagonal honeycomb structure. The anti-freezing anti-cracking fire-fighting pipeline structure suitable for the low-temperature environment is used for conveying tap water.

The invention discloses a continuous pipe layered gas injection process pipe column and a working method thereof. The continuous pipe layered gas injection process pipe column comprises an inner continuous pipe and an outer continuous pipe. The inner continuous pipe is located in the outer continuous pipe, and the outer wall of the inner continuous pipe and the inner wall of the outer continuous pipe are arranged at intervals. An anchor, a first packer, a gas injection valve and a second packer are sequentially arranged on the outer wall, close to the bottom, of the outer continuous pipe from top to bottom, and the bottom of the outer continuous pipe and the bottom of the inner continuous pipe are connected in a sealed mode. An independent layered gas injection channel is formed, the ground flow is adjustable, and a new technical thought is provided for shaft matching of layered gas injection in a gas drive test and improvement of the oil field recovery ratio.

According to the technical scheme, the high-elongation-at-break polyethylene pipe for water supply is characterized by comprising a polyethylene main body layer, an EVOH composite pipe layer is arranged on the outer circle wall of the polyethylene main body, and a protection assembly is arranged between the polyethylene main body and the EVOH composite pipe layer. The EVOH composite pipe is used for reducing damage of stones and other hard objects in water flow in the pipe to the pipeline, the polyethylene main body layer is arranged, basic strength and toughness are provided, the high elongation at break characteristic enables the pipe to cope with foundation settlement and end load, deformation or damage caused by external pressure is reduced, the EVOH composite pipe layer is arranged, and therefore the pipe is not prone to deformation or damage caused by external pressure. Compared with the prior art, the pipe has good acid and alkali resistance, meanwhile, the flexibility of the pipe is improved, damage to the pipe is reduced, the protection assembly is arranged, the impact force of hard objects is effectively dispersed and buffered, the protection assembly can protect the integrity of the pipe, the fracture or perforation risk caused by external impact is reduced, and therefore normal operation and safety of a water supply system are guaranteed.

A flexible pipe for conveying oil and gas field fluids, the pipe comprising a pipe body comprising first and second pipe layers. The first pipe layer is an innermost pipe layer, and the second pipe layer is an outermost pipe layer. At least one of the first and second pipe layers is a composite layer formed of a reinforcement embedded in a thermoplastic matrix material. A heat distortion temperature of the composite layer is greater than 200° F. as tested in accordance with ASTM D648 or ISO 75 using an outer fibre stress of 0.455 MPa. There is also provided a method of manufacturing a flexible pipe.

The application discloses a pipeline connecting structure, which comprises a copper-plastic composite pipe, a connecting fixing piece and a connecting sealing ring. The copper-plastic composite pipe comprises a copper lining pipe layer and a pipeline plastic layer wrapped outside the copper lining pipe layer. The two ends of the copper lining pipe layer are provided with connecting ports. An annular lower groove is formed on the outer surface of the end of the connecting port away from the copper lining pipe layer. The connecting piece comprises a transition part and connecting ends arranged at the two ends of the transition part. The connecting ends comprise first connecting parts away from the transition part and second connecting parts close to the transition part. The first connecting parts are used for being matched with the connecting ports. The first connecting parts comprise first connecting copper pipe layers, second connecting copper pipe layers and first connecting plastic pipe layers wrapped outside the second connecting copper pipe layers. The first connecting copper pipe layers and the second connecting copper pipe layers form annular connecting grooves for the connecting ports to enter. An annular upper groove matched with the annular lower groove is formed on the inner wall of the second connecting copper pipe layer. The connecting sealing ring is arranged between the annular lower groove and the annular upper groove.

A flexible pipe for conveying oil and gas field fluids, the pipe comprising a pipe body comprising first and second pipe layers. The first pipe layer is an innermost pipe layer, and the second pipe layer is an outermost pipe layer. At least one of the first and second pipe layers is a composite layer formed of a reinforcement embedded in a thermoplastic matrix material. A heat distortion temperature of the composite layer is greater than 200 °F as tested in accordance with ASTM D648 or ISO 75 using an outer fibre stress of 0.455 MPa. There is also provided a method of manufacturing a flexible pipe.

The utility model relates to the technical field of steel pipes, and discloses a seamless steel pipe with a heat insulation function, which comprises a steel pipe body, the steel pipe body comprises an inner-layer pipe, the inner-layer pipe is made of metal, the inner wall of the inner-layer pipe is smooth and seamless, the outer wall of the inner-layer pipe is fixedly connected with a central-layer pipe, and the outer wall of the central-layer pipe is fixedly connected with an outer-layer pipe. And the central layer pipe comprises a plurality of heat insulation strips which are spirally and fixedly connected to the outer wall of the inner layer pipe at equal intervals. The structural design of the composite heat insulation pipe is adopted, the inner layer is the metal pipe to guarantee strength, the heat insulation pipe layer is wrapped on the outer layer and comprises the heat insulation strips which are spirally arranged on the outer wall of the metal pipe on the inner layer at equal intervals, and the heat insulation strips are made of heat insulation materials, namely glass fiber materials, and the heat insulation materials of the heat insulation pipe layer are low in heat conductivity coefficient. The integral seamless steel pipe can obviously reduce heat conduction and reduce heat exchange between a medium and the pipe wall while ensuring the integral strength.