53 results about "Pipe layer" patented technology

The dredging high-strength wear-resistant steel pipe is characterized by comprising a steel pipe body, the steel pipe body is composed of a wear-resistant steel pipe layer and a steel pipe layer, the wear-resistant steel pipe layer is arranged in the steel pipe layer, and a plurality of welding holes are formed in the steel pipe layer at certain intervals; the steel pipe layer and the wear-resistant steel pipe layer are connected together by welding from the welding holes, the steel pipe body is formed by combining the traditional steel pipe layer and the wear-resistant steel pipe layer, and the wear-resistant steel pipe layer is located in the carbon steel layer, so that the wear resistance of the steel pipe body in the using process is greatly enhanced, and the service life of the steel pipe body is prolonged. The wear-resistant steel pipe layer located inside can be in contact with conveyed materials, and particularly, the wear-resistant steel pipe layer has better impact resistance when being impacted by various rocks in the materials; and the wear-resistant steel pipe layer is wrapped by the carbon steel layer located outside, so that the overall toughness is improved, and the steel pipe body has both toughness and high-strength wear resistance.

The utility model discloses a shock absorption and isolation support with a pressure reduction structure, which relates to the technical field of buildings and comprises an upper pre-buried plate, an upper connecting steel plate, a middle steel ring layer, a lower connecting steel plate and a lower pre-buried plate, a plurality of groups of lead layers are arranged in the middle steel ring layer, a plurality of partition layers are arranged in each lead layer, viscoelastic bodies are filled in the partition layers, and the upper connecting steel plate is connected with the lower pre-buried plate. A damping air pipe is connected between the middle steel ring layer and the upper connecting steel plate, a top damping release part is connected to the upper connecting steel plate, and air generated by the top damping release part is released to the partition layer through the damping air pipe. Compressed air generated by transverse shearing force of a building is conducted to the partition layer of the middle steel pipe layer from the damping air pipe, so that viscoelastic bodies located at the partition layer can flow easily, the transverse shearing force of the middle steel pipe layer can be released easily, and the situation that abrasion is aggravated is avoided.

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 invention provides a myriameter deep well pipe column structure and a design and construction method thereof. The myriameter deep well pipe column structure comprises a well bore structure, and the well bore structure sequentially comprises a guide pipe, a technical casing, a technical tail pipe and a production casing from top to bottom; the high-strength drilling tool assembly sequentially comprises a drill rod assembly, a drill collar assembly, a drilling tool check valve and a drill bit from top to bottom; wherein the drill collar assembly comprises a plurality of conventional drill collars and non-magnetic drill collars, and centralizers are arranged between the conventional drill collars and the non-magnetic drill collars. According to the myriameter deep well pipe column structure, casing pipe layers are matched according to stratum characteristics, compared with the prior art, the casing pipe layers are reduced, and the grading pipe column structure resistant to high temperature and high pressure and high in safety redundancy is designed; and a high-strength drilling tool combination and a matched anti-failure process are developed, and the fracture risk of the drill column is reduced. According to the design method and the construction method, fine pressure control and well body quality control technologies are integrated, and safe drilling of a complex stratum is achieved; and a well cementation and well completion integrated scheme suitable for myriameter-level well depth is provided.

The utility model discloses an aluminum alloy plastic-lined composite pipe which comprises a pipe body, an aluminum alloy pipe layer is arranged in the pipe body, a lining layer is arranged on the inner side of the aluminum alloy pipe layer, and a water stop cavity is formed in one end of the pipe body. The utility model has the beneficial effects that by arranging the water stop cavity, the connecting ring and the water-swellable water stop strip, the connecting ring and the water stop cavity can realize pre-splicing of the pipeline body in the pipeline splicing process, and the water-swellable water stop strip performs secondary sealing on the joint of the pipeline body in the use process, so that the water-swellable water stop strip is prevented from being damaged. Overflow water generated due to process reasons enters the joint of the water stop cavity and the connecting ring in advance, at the moment, the water-swelling water stop strip swells irregularly, the gap where the water stop cavity is connected with the connecting ring can be blocked instantly, then water is prevented from flowing out of the gap, the water leakage phenomenon can be effectively avoided, and the service life of the pipeline body is prolonged.

The utility model belongs to the technical field of water supply pipes, and particularly relates to a compression-resistant heat preservation pipe which comprises an inner pipe layer, an outer pipe layer and a middle reinforcing layer arranged between the inner pipe layer and the outer pipe layer, the inner pipe layer and the outer pipe layer are high-strength heat preservation composite layers, the middle reinforcing layer is distributed between the inner pipe layer and the outer pipe layer in a spiral shape, and the middle reinforcing layer is arranged between the inner pipe layer and the outer pipe layer. The two ends of the inner pipe layer and the two ends of the outer pipe layer are flush with the two ends of the middle reinforcing layer, sealing treatment is conducted on the ends, and the inner pipe layer and the outer pipe layer are used for preventing water from permeating among the layers. Pressure can be transmitted and dispersed in the spiral direction, the situation that the water supply pipe deforms or cracks due to local pressure concentration is avoided, and the compressive strength and stability of the water supply pipe are improved while heat preservation is conducted.

The utility model discloses a vacuum carrying hose which is particularly used for vacuum suction lifting equipment such as a suction lifting machine, a balance crane, a transfer trolley and a carrying vehicle. The vacuum carrying hose comprises an elastic metal wire, a pipe material layer and a winding wire. According to the utility model, a winding and shaping mode is adopted, the pipe layer can be manufactured to be thin enough, then the spiral elastic metal wire is tightly wrapped with the pipe layer, and after the pipe layer and the spiral elastic metal wire are tightly attached, the vacuum hose with the pipe wall thin enough can be manufactured, so that the flexibility of the vacuum hose is improved. In addition, the spiral elastic metal wire can provide good rebound resilience for the hose, and the telescopic effect is improved. Meanwhile, the elastic metal wires are attached to the inner wall of the pipeline, manufacturing is convenient and fast, and the integrity of the pipe layer is good.

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 utility model discloses a plastic-coated composite steel pipe with a welding end, relates to the technical field of plastic-coated composite steel pipes, and solves the technical problems that the durability of the steel pipe in a complex environment is influenced and the expected service life of the steel pipe is shortened due to the relatively weak sealing, protection and noise reduction performance of the conventional plastic-coated composite steel pipe. Comprising a pipe body and welding ends arranged at the two ends of the pipe body. Wherein the pipe body is divided into a steel pipe layer and a polyethylene layer wrapping the steel pipe layer, and each welding end is sleeved with a rubber sealing sleeve; the outer layer comprises a metal reinforcing sheet layer, a noise reduction layer and polyurethane foam filled between the steel pipe layer and the polyethylene layer; wherein the noise reduction layer is wrapped outside the polyethylene layer; according to the coated composite steel pipe, the durability of the coated composite steel pipe under complex environmental conditions is remarkably improved, and the expected service life of the coated composite steel pipe is further prolonged.

The utility model relates to the technical field of composite pipes, and particularly discloses a double-color steel strip reinforced composite pipe. Comprising an anti-corrosion inner pipe layer and a U-shaped steel framework layer, the U-shaped steel framework layer is arranged on the outer surface of the anti-corrosion inner pipe layer, the outer surface of the U-shaped steel framework layer is coated with a protective layer, and a steel wire mesh layer for supporting the anti-corrosion inner pipe layer is arranged on the inner side of the U-shaped steel framework layer. The technical problems that the lower end face and the two sides of a pipeline are prone to corrosion damage and water seepage occurs in the using process of a steel belt reinforced composite pipe in the prior art are solved.

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.

The utility model discloses a reinforcing pipe, which comprises a pipe body and a ribbed pipe, the ribbed pipe is spirally wound on the outer wall of the pipe body along the length direction of the pipe body, the inner side pipe wall of the ribbed pipe is welded with the outer wall of the pipe body, the interior of the ribbed pipe is hollow, and the reinforcing pipe is characterized in that the ribbed pipe comprises an outer pipe layer and an inner pipe layer, the inner pipe layer is coated with the outer pipe layer, the outer pipe layer and the inner pipe layer are welded together, the inner pipe layer is provided with a plurality of corrugated strips which protrude inwards and are arranged side by side, the corrugated strips are perpendicular to the extending direction of the rib pipes, and the cross sections of the corrugated strips are trapezoidal or square. The reinforcing pipe is higher in strength, better in compression resistance and shock resistance, not prone to deformation after being embedded and not prone to fracture due to shock.

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 500kV high-pressure deepwater submarine power cable, which comprises a body, the inner layer of the body comprises at least one core wire unit (1), the outer layer of the core wire unit (1) comprises a composite pipe layer (1.1), the composite pipe layer (1.1) comprises a copper pipe (1.1. 1) and a steel pipe (1.1. 2), the copper pipe (1.1. 1) is connected with the steel pipe (1.1. 2), the steel pipe (1.1. 2) is arranged on the outer layer of the copper pipe (1.1. 1), and the copper pipe (1.1. 1) is connected with the steel pipe (1.1. 2). The outer layer of the composite pipe layer (1.1) is provided with a core wire sheath layer (1.2) made of a PE material. The invention provides a 500kV high-pressure deepwater submarine power cable which has stronger mechanical strength protection and is suitable for the water depth of below 1500m.

The utility model discloses a mute drainage pipeline which comprises an inner pipe layer, a damping layer, a silencing layer and an outer pipe layer. Wherein the inner pipe layer is provided with a linear flow guide body, water flow can flow in a vortex state during drainage, blocking force is generated on the water flow at multiple positions in the pipe body, impact of the water flow on the inner pipe wall is reduced, and noise of the pipeline structure is lowered. The inner pipe layer is peripherally wrapped by the damping layer, vibration generated by water flow impact is weakened through the damping characteristic of the damping layer, and the buffering and damping effects are achieved. The sound attenuation layer utilizes acoustic propagation characteristics and adopts a wedge structure to increase sound propagation distance and absorb noise, so that the purpose of sound attenuation is achieved. The outer pipe layer is of a solid structure and is made of the same material as the inner pipe layer, the overall strength of the pipe body is improved, and the service life of the pipeline is prolonged. The noise reduction device has an obvious noise reduction effect on noise generated by the drainage pipe, meets the comfort requirement of modern family life, and is suitable for being popularized in the technical field of drainage.

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.

The invention relates to the technical field of stainless steel pipes, and provides a sterilization stainless steel composite pipe and a preparation method thereof.The stainless steel composite pipe sequentially comprises a copper pipe layer and a stainless steel pipe layer from inside to outside, a brazing material layer is arranged outside the copper pipe layer, and the stainless steel pipe is composed of, by weight, 18%-20% of Cr, 6%-8% of Ni, 2.0%-4.0% of Cu, 0.4%-0.8% of Mo, 1%-2% of Mn, 0.8%-1.5% of Si, 0.7%-1.0% of Ag, 0.05%-0.08% of Zn, 0.05% < = Sc + Ce < = 0.06%, 0.03% < = C and the balance Fe and other inevitable impurities. Through the technical scheme, the problem of poor sterilization effect of the stainless steel pipe in the related technology is solved.

The present invention discloses a submarine multi-layer oil and gas transmission pipeline, comprising a pipeline body and a pipeline assembly, wherein the pipeline body is assembled through the pipeline assembly, and the pipeline assembly comprises a concrete counterweight layer, a corrugated pressure-resistant layer, an anti-corrosion protective layer, a steel pipe layer, a friction-reducing coating and spiral fins. The outer side of the pipeline body is welded with a concrete counterweight layer, the inner side of the concrete counterweight layer is provided with a corrugated pressure-resistant layer, the inner side of the corrugated pressure-resistant layer is provided with an anti-corrosion protective layer, the inner side of the anti-corrosion protective layer is plugged and installed with a steel pipe layer, the inner side of the steel pipe layer is coated with a friction-reducing coating, and the outer side of the concrete counterweight layer is provided with multiple groups of spiral fins; the composite structure of the present invention significantly improves the impact resistance and deformation adaptability of the pipeline under deep-sea high pressure, ocean current impact and geological displacement through multi-level collaborative design, and the coupling of the honeycomb skeleton and the corrugated layer not only enhances the structural stability, but also reduces material redundancy and construction costs.

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.

The seabed multi-layer oil and gas conveying pipeline comprises pipeline bodies and pipeline assemblies, the pipeline bodies are combined through the pipeline assemblies, each pipeline assembly comprises a concrete balance weight layer, a corrugated compression-resistant layer, an anti-corrosion protection layer, a steel pipe layer, an anti-attrition coating and spiral fins, the concrete balance weight layers are welded to the outer sides of the pipeline bodies, and the corrugated compression-resistant layers are welded to the outer sides of the pipeline bodies. A corrugated compression-resistant layer is arranged on the inner side of the concrete counterweight layer, an anti-corrosion protection layer is arranged on the inner side of the corrugated compression-resistant layer, a steel pipe layer is installed on the inner side of the anti-corrosion protection layer in an inserted connection mode, the inner side of the steel pipe layer is coated with an anti-attrition coating, and multiple sets of spiral fins are arranged on the outer side of the concrete counterweight layer. According to the composite structure, through multi-level collaborative design, the impact resistance and deformation self-adaptability of the pipeline under deep sea high pressure, ocean current impact and geological displacement are remarkably improved, the structural stability is enhanced through coupling of the honeycomb framework and the corrugated layer, the material redundancy is reduced, and the construction cost is reduced.

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 discloses an evacuation system for fire-fighting design of an underground main power house of water-power engineering. The underground main power house comprises a generator layer, a bus layer, a water turbine layer, a volute layer and a draft tube layer which are sequentially arranged from top to bottom, and an open staircase arranged in a unit room of the underground main power house; at least one evacuation staircase is arranged on the outer side of the upstream side wall of the underground main power house, the evacuation staircase comprises a firewall, a first fireproof door, a front room, a second fireproof door and stairs, the evacuation staircase is located on a generator floor and floors below the generator floor, the first fireproof door is communicated with the underground main power house on the floor and the front room on the floor, and the second fireproof door is communicated with the stairs. And the second fireproof door is arranged between the front room and the staircase, so that the staircase is not directly communicated with each floor of the underground main power house. The device is suitable for all large and medium-sized hydropower engineering, and is low in application difficulty and convenient to implement. The problems of emergency exits and evacuation distances are fundamentally solved, and great economic benefits are achieved in the aspects of smooth power generation commissioning and life and property safety guarantee of hydropower engineering.