CN109099260B - Preparation method of steel-plastic grouting composite pipe for fluid heating snow melting - Google Patents
Preparation method of steel-plastic grouting composite pipe for fluid heating snow melting Download PDFInfo
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- CN109099260B CN109099260B CN201810938796.3A CN201810938796A CN109099260B CN 109099260 B CN109099260 B CN 109099260B CN 201810938796 A CN201810938796 A CN 201810938796A CN 109099260 B CN109099260 B CN 109099260B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
Abstract
The invention discloses a preparation method of a steel-plastic grouting composite pipe for heating fluid to melt snow, which consists of a plastic inner pipe, a metal outer pipe and a concrete layer which is formed between the plastic inner pipe and the metal outer pipe by grouting and fills the space between the plastic inner pipe and the metal outer pipe, wherein the method comprises the following steps: providing the metal outer tube; providing the plastic inner pipe, and placing the plastic inner pipe in the metal outer pipe; and providing a grouting material or grouting material and injecting it into the space between the plastic inner pipe and the metal outer pipe to form the concrete layer.
Description
Technical Field
The invention relates to the technical field of road snow melting, in particular to a preparation method of a steel-plastic grouting composite pipe for fluid heating snow melting.
Background
Compared with passive snow melting modes such as spreading of chemical snow melting agents and mechanical snow and ice removing methods, the fluid heating snow melting system can carry out preventive active snow removal according to the snow falling amount and weather conditions, and is strong in system controllability, high in energy utilization rate, wide in heat source (can be a conventional heat source or a renewable heat source), and simple and convenient to install.
The fluid heating snow melting system utilizes a circulating pump to enable hot fluid to circulate in a pipeline buried in the interior of a road surface, enables heat of the fluid to be transferred to the road surface structure in a heat convection and heat exchange mode at the pipe wall, transfers the heat to the surface of a road body by means of heat conduction in the interior of a structural layer, and then carries out heat exchange with ice and snow through heat transfer, so that the purposes of melting snow and ice are achieved. In the system, solutions with low freezing points such as propylene glycol aqueous solution, ethylene glycol aqueous solution and the like can be used as circulating media; pipes buried in the pavement need good temperature and corrosion resistance, and good strength and flexibility to have good resistance to fluid erosion in the pipes and to road loads such as loads of automobiles and airplanes during construction and installation and during working.
At present, the fluid heating pipeline pipe generally comprises metal pipes such as steel pipes, PSP steel-plastic composite pipes, plastic pipes and the like.
The steel pipe has high strength, linear expansion coefficient close to that of concrete, and is mainly used for conveying heat supply fluid and has strong heat conducting performance. However, since the fluid is slightly corrosive due to the addition of an antifreeze, the steel pipe is not suitable for use as a heating pipe as it is.
The plastic pipe is produced by using synthetic resin, i.e. polyester, as raw material, adding stabilizer, lubricant, plasticizer, etc. and extruding in pipe making machine in plastic method, and is mainly used as the pipe for water supply system, drainage, exhaust and pollution discharge sanitary pipe, underground drainage pipe system, rain water pipe, and threading pipe for electric wire installation. The plastic pipes are classified into thermoplastic plastic pipes and thermosetting plastic pipes. The thermoplastic material includes polyvinyl chloride pipe, polyethylene pipe, polypropylene pipe, polyformaldehyde pipe, etc.; belongs to thermosetting phenolic plastic pipes and the like. The plastic pipe has the main advantages of good corrosion resistance, light weight, convenient molding, easy processing and relatively good flexibility and ductility of thermoplastic pipes; but the heat conducting performance and the fracture and compression resistant performance of the plastic pipe are poor. When the impact force of traffic load on the road surface is large or the road surface plates are staggered and statically moved, the plastic pipes are weak in resistance and are cut off to form leakage risks.
The PSP steel-plastic composite pressure pipe is a novel metal and plastic composite pipe, generally takes a welded steel pipe as an intermediate layer, takes polyethylene plastics as an inner layer and an outer layer, adopts special hot melt adhesive, and is compounded into an integral pipe by an extrusion molding method. The pipe overcomes the defects of easy corrosion, pollution, heavy weight, short service life and low strength, large expansion amount and easy deformation of a plastic pipe, and has the common advantages of the steel pipe and the plastic pipe, such as good oxygen isolation, higher rigidity, easy detection of a buried pipe and the like. However, the PSP steel-plastic composite pipe has the defects of low overall strength and poor heat conductivity. In addition, when the PSP steel-plastic composite pipe is adopted, for a long-distance conveying pipeline, the longest 12m of the PSP steel-plastic composite pipe needs to be provided with one hot melting or electric melting joint, and for example, the designed width of an F-type runway is 60m, at least 4 joints are needed. If the runway construction process is combined, a joint is needed at a position of 5m, and at least 11 joints are needed at a position of 60 m. More joints may create a risk of fluid leakage.
Therefore, a new type of pipeline is needed to solve the above existing technical problems.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide the steel-plastic grouting composite pipe for heating fluid to melt snow and the preparation method thereof.
According to one aspect of the present invention, there is provided a method for manufacturing a steel-plastic grouting composite pipe for fluid heating snow melting, the steel-plastic grouting composite pipe being composed of a plastic inner pipe, a metal outer pipe, and a concrete layer formed between the plastic inner pipe and the metal outer pipe by grouting and filling a space therebetween, the method comprising:
providing the metal outer tube;
providing the plastic inner pipe, and placing the plastic inner pipe in the metal outer pipe; and
grouting or grouting material is provided and injected into the space between the plastic inner pipe and the metal outer pipe to form the concrete layer.
According to one embodiment of the invention, wherein the grouting or grouting material complies with the standard TB/T3192-2008 or JTG/TF 502011.
According to one embodiment of the invention, wherein the grouting or grouting material comprises an H-60 grouting agent.
According to an embodiment of the present invention, the pressure at the time of the injection is about 1.0 to 1.4MPa, preferably 1.1 to 1.3MPa, and more preferably 1.2 MPa.
According to one embodiment of the invention, the grouting speed at the time of said pressure injection is about 0.3-0.7m/s, preferably 0.5 m/s.
According to an embodiment of the invention, the method for preparing the steel-plastic grouting composite pipe for fluid heating snow melting further comprises the steps of plugging two ends of the plastic pipe and injecting water into the plastic pipe before the pressure injection.
According to one embodiment of the invention, wherein the pressure of the injected water in the plastic tube does not exceed 0.4 MPA.
According to an embodiment of the invention, the method for manufacturing the steel-plastic grouting composite pipe for fluid heating snow melting further comprises adding solid matters, such as thinner weights, for example, steel wires, into the plastic pipe before plugging, so as to adjust the weight of the plastic pipe.
According to another aspect of the invention, a steel-plastic grouting composite pipe for fluid heating snow melting is provided, which is composed of a plastic inner pipe 30, a metal outer pipe 10 and a concrete layer 20 formed between the plastic inner pipe and the metal outer pipe by grouting and filling the space between the plastic inner pipe and the metal outer pipe.
According to one embodiment of the present invention, wherein said plastic inner tube 30 is a polyethylene tube.
According to one embodiment of the invention, wherein the polyethylene pipe is a De25 plastic pipe.
According to one embodiment of the invention, wherein the metal outer tube is a DN32 steel tube.
According to one embodiment of the invention, the length of the steel-plastic slip casting composite pipe is 1-60 meters.
According to one embodiment of the invention, the steel-plastic slip casting composite pipe is an eccentric pipe, and the geometric center of the cross section of the plastic inner pipe is not coincident with that of the metal outer pipe.
According to one embodiment of the invention, the plastic inner tube is partially in abutment with the metal outer tube.
According to one embodiment of the invention, wherein the grouting or grouting material used in the grouting complies with the standard TB/T3192-2008 or JTG/TF 502011.
According to one embodiment of the invention, wherein the grouting or grouting material comprises an H-60 grouting agent.
According to one embodiment of the invention, the thermal conductivity of the steel-plastic slip-casting composite pipe is more than 1.0W/(m.K), such as 2.0, 3.0, 4.0, 5.0W/(m.K) and the like.
The invention solves a plurality of technical problems of the tubing selected by the fluid heating snow melting system in the past, and has beneficial technical effects:
1) the service life can be as long as 50 years. The service life of the plastic pipe can reach 50 years, so that the innermost plastic pipe plays a role in conveying the heating fluid, and the service life of the pipeline exceeding the design age of the pavement (generally 30 years) can be prolonged.
2) The corrosion resistance is strong. The steel pipe is weak in corrosion resistance, is not suitable for conveying heating fluid, and the plastic pipe is strongest in corrosion resistance and can be used for directly conveying fluid. The steel pipe is used as an outer protective shell of the plastic pipe, mortar is filled between the steel pipe and the plastic pipe, and the strength and the corrosion resistance of the composite pipeline can be further enhanced.
3) The 'steel-plastic grouting composite pipe' has better heat conductivity coefficient, and is far better than PSP pipes and plastic pipes. Therefore, good heat conduction and snow melting effects can be achieved.
Drawings
Fig. 1 is a schematic diagram of a steel-plastic slip-casting composite pipe structure for fluid heating snow melting according to one embodiment of the present invention.
Fig. 2 is a schematic flow chart of a manufacturing method of a steel-plastic grouting composite pipe for fluid heating snow melting according to an embodiment of the invention.
FIG. 3 is a schematic diagram of a configuration for detecting thermal conductivity of a pipeline using a sandbox model according to one embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the examples, but without limiting the invention.
Fig. 1 is a schematic diagram of a steel-plastic slip-casting composite pipe structure for fluid heating snow melting according to one embodiment of the present invention. As shown in fig. 1, the steel-plastic slip-cast composite pipe includes three parts, i.e., a plastic inner pipe 30, a metal outer pipe 10, and a concrete layer 20, wherein the concrete layer 20 is formed between the plastic inner pipe and the metal outer pipe by slip-casting and fills a space therebetween, and a high-temperature fluid 40 for providing thermal energy flows in the plastic inner pipe 30.
The metal outer tube 10 may be, for example, a steel tube, such as DN32 steel tube, and the type of the steel tube may be selected as required. The length, diameter, etc. of the steel pipes can be selected according to specific needs, for example, when a long length, such as 60 meters, is needed, a plurality of steel pipes can be threaded or welded. The metal outer pipe 10 is used as an outer layer pipeline, and can provide good strength and protection for the steel-plastic grouting composite pipe.
The plastic inner tube 30 may be a thermoplastic tube and a thermosetting plastic tube, and may be, for example, a polyvinyl chloride tube, a polyethylene tube, a polypropylene tube, a polyoxymethylene tube, a phenol plastic tube, or the like. The inner diameter and length of the plastic tube can be selected as desired, for example, the inner diameter can be selected for the designed flow rate of the snow melting fluid, but the outer diameter should be suitably smaller than the inner diameter of the metal outer tube. For example, the difference between the two may be 5mm to 20mm, e.g., 6mm, 7mm, 8mm, 10mm, 15mm, and so forth. One skilled in the art can readily select the appropriate diameter as desired. The length of the plastic inner tube 30 may be suitably cut as desired, for example, 1m, 5m, 10m, 30m, 60m, and so on.
For example, the plastic inner tube 30 has the main advantages of good corrosion resistance, light weight, convenient molding, easy processing, and relatively good flexibility and ductility of the thermoplastic type pipe. According to one embodiment of the present invention, wherein said plastic inner tube 30 is a De25 polyethylene tube.
In order to ensure the snow melting effect and enhance the heat conduction, the invention carries out dense filling on a gap layer between the outer sleeve (steel pipe) and the heating pipe (plastic pipe). As shown in fig. 1, the composite pipe of the present invention further includes a concrete layer 20 disposed between the plastic inner pipe 30 and the metal outer pipe 10. The concrete layer 20 may be formed between the plastic inner pipe and the metal outer pipe by grouting and fills the space therebetween. Concrete layer 20 makes plastics inner tube 30 fixed, still provides the support for metal outer tube 10 for compound pipe is more firm on the whole, has realized technological effects such as resistance to compression shock, corrosion-resistant strong, thermal conductivity is good and long service life.
More specifically, the concrete layer 20 of the present invention is formed between the plastic inner pipe 30 and the metal outer pipe 10 by grouting using a grouting material or grouting material. The concrete layer 20 formed after grouting is compact, free of hollowing and bubbles, the whole pipeline is free of deformation, and the inner wall of the outer pipe and the outer wall of the inner pipe are in close contact with grouting materials and free of shrinkage. In addition, the integral pipe has good thermal conductivity, significantly better than plastic or PSP pipe, for example, it may have a thermal conductivity greater than 1.0W/(m · K), such as 2.0W/(m · K), 3.0W/(m · K), 4.0W/(m · K), 5.0W/(m · K), 6.0W/(m · K), and so forth.
For this purpose, for example, those grouting or grouting materials which meet the standard TB/T3192-2008 or JTG/TF502011, more preferably those containing H-60 grouting agents, may be preferred. Based on the teachings of the present invention in combination with the prior art, one skilled in the art can readily select a suitable grouting or grouting material.
As shown in fig. 1, the steel-plastic grouting composite pipe of the present invention may be an eccentric pipe, that is, the geometric center of the cross section of the plastic inner pipe 30 is not coincident with the geometric center of the cross section of the metal outer pipe 10. This means that the thickness of the concrete layer 20 between the plastic inner pipe 30 and the metal outer pipe 10 is not uniform. For example, the thickness of the concrete layer 20 is shown to be tapered from top to bottom, with the upper portion having a smaller thickness than the lower portion. Further, the top part of the plastic inner tube 30 may even abut against the inner wall of the metal outer tube 10.
When such an eccentric pipe is buried under the ground as shown in the drawing, since the plastic inner pipe 30 containing a high-temperature fluid is closer to or even abuts against the metal outer pipe 10, the heat-conducting property of the upper portion of the composite pipe is better, heat energy is more easily conducted to the ground, and a better snow-melting effect can be achieved.
The process of forming the composite tube of the present invention is further described below with reference to figure 2. Referring to fig. 2, the method for manufacturing the steel-plastic grouting composite pipe for fluid heating snow melting according to the present invention may include the following steps:
first, a metal outer tube 10 is provided, and an appropriate metal tube such as DN32 steel tube can be selected as required. The length, the diameter and the like of the steel pipe can be selected according to specific needs, for example, when a long length such as 60 meters is needed, a plurality of steel pipes can be welded;
the inner plastic pipe 30 is provided and placed inside the outer metal pipe, for example, De25 pvc pipe may be provided, and the entire plastic pipe may be threaded by manual or mechanical pulling. The diameter of the plastic tube can be selected according to the designed flow rate of the snow melting fluid, and the outer diameter of the plastic tube is properly smaller than the inner diameter of the metal outer tube. For example, the difference between the two may be 5mm to 30mm, e.g., 6mm, 7mm, 8mm, 10mm, 1mm, 20mm, 25mm, and the like. The length of the plastic inner tube 30 can be cut according to the degree of the metal outer tube, for example, the length can be slightly longer than that of the metal outer tube, and the lengths of the ends at the two sides of the plastic tube are reserved for subsequent operation;
a grouting material or grouting material is provided and injected into the space between the plastic inner pipe and the metal outer pipe to form a concrete layer 20 filling the space. The grouting or grouting material may be selected from those meeting the standard TB/T3192-2008 or JTG/TF502011, preferably those containing H-60 grouting agent. And pressing the prepared grouting material or grouting material into the pipeline clearance layer (namely the space between the plastic inner pipe and the metal outer pipe) by grouting equipment. The grouting pressure may be appropriately selected depending on the particular circumstances, and may be, for example, 1.0 to 1.4MPa, for example, 1.1MPa, 1.2MPa, or 1.3 MPa. The grouting speed can be controlled appropriately, for example, 0.30.7m/s, for example, about 0.5m/s, and the grouting time per pipe can be controlled and selected appropriately, for example, the grouting time per pipe can be 1.5 to 3 minutes, 2 to 2.5 minutes. Grouting equipment is well known to those skilled in the art and will not be described in detail herein.
Due to the combined action of gravity and buoyancy of fluid, the plastic inner pipe 30 floats upwards to be eccentric in the grouting process, so that the formed steel-plastic grouting composite pipe is an eccentric pipe, namely the geometric center of the section of the plastic inner pipe is not coincident with that of the metal outer pipe, and even the top of the plastic inner pipe is partially attached to the inner wall of the metal outer pipe. When such an eccentric pipe is buried under the ground as shown in fig. 1, since the plastic inner pipe 30 containing a high-temperature fluid is closer to or even abuts against the metal outer pipe 10, the heat-conducting property of the upper portion of the composite pipe is better, heat energy is more easily conducted to the ground, and a better snow-melting effect can be achieved.
Preferably, the method according to the present invention further comprises plugging both ends of the plastic inner tube 30 before the grouting, and injecting water therein. The weight of the plastic inner pipe can be adjusted by injecting water, so that the eccentricity of the plastic inner pipe during grouting can be adjusted. It is of course also possible to add weights, such as steel wires or the like, to the plastic inner tube to adjust the weight of the plastic inner tube and to adjust the degree of eccentricity, thereby even making it possible to make the composite tube non-eccentric. Meanwhile, the water injection helps to maintain the internal pressure of the plastic inner pipe 30, and prevents the plastic inner pipe 30 from being flattened during the grouting process.
As will be readily understood by those skilled in the art. The injection pressure may be chosen to be suitable to prevent the plastic tube from expanding due to too high a pressure, for example, the pressure of the injected water may not exceed 0.4 MPa. After the slurry has set, the water or other ballast in the plastic tubing may be removed.
The invention is further illustrated by the following examples.
Example-preparation of Steel-Plastic slip-casting composite pipe and detection of Performance parameters
Materials and parameters:
the metal outer pipe is a DN32 welded steel pipe, the length is 24 meters, the outer diameter is 41.23mm, and the wall thickness is 2.47 mm;
the plastic inner pipe is a De25 polyethylene pipe, the length is 24 meters, the outer diameter is 24.57mm, and the wall thickness is 3.1 mm;
grouting materials: water, a grouting agent (H-60) and cement are weighed according to the weight ratio of 30: 10: 90, and the reference standard TB/T3192-2008 is adopted;
grouting pressure: about 1.2MPa, grouting speed: about 0.5 m/s;
the plastic inner pipe is filled with water, two ends of the plastic inner pipe are sealed, and the pressure in the plastic inner pipe is about 0.4 MPa;
the steel-plastic grouting composite pipe is prepared by the method, a plurality of samples are averaged, and the finally obtained steel-plastic grouting composite pipe has the length of 2496mm and the eccentricity of 4 mm;
in addition, a steel pipe, a De25 polyethylene pipe and a De25PSP steel-plastic composite pipe were welded by DN32 as a control group. The performance parameters of each product are shown in table 1 below.
Table 1: comparison of different pipe Properties Table 1
The detection of the flexural strength of the concrete is carried out according to GBT 50082-2009 standard test method for long-term performance and durability of common concrete and GBT 50081-2002 standard test method for mechanical performance of common concrete, so that the FC fiber added in the invention and other control tubes is finally obtained, and the flexural strength of the concrete after the tube is added is 28 days: as shown in the table above, the steel-plastic grouting composite pipe of the invention shows better concrete flexural strength, which is higher than the requirement of the design standard 5.OMPa, and is superior to most other control pipes.
The thermal conductivity was measured as follows:
respectively embedding test pipe sections (comprising the steel-plastic grouting composite pipe, the DN32 welded steel pipe, the De25PSP steel-plastic composite pipe and the De25 polyethylene pipe) in soil with a heat conductivity coefficient of 1.25W/m.K, enabling the central axis of the pipeline to be 1m away from the ground, enabling hot water at the temperature of 40 ℃ to circularly flow in the pipeline at the speed of 2.0m/s and 1.2m/s by utilizing a constant-temperature water bath, and respectively arranging a thermal resistance type temperature sensor (measuring the wall temperature of the pipe, indicated by black dots in figure 3) and a heat flow sensor measuring sheet at the top and the bottom of the pipe at the center of the length direction of the test pipe sections; in the soil 0.95m above the pipe top, 3 thermoresistive temperature sensors (numbered 1, 2, 3, spaced 0.3m apart, measuring the soil temperature close to the soil surface, see fig. 3) were arranged in the pipe section axial direction.
The test environment temperature is 30 ℃, the stability is realized after 3 hours, and the numerical fluctuation of the temperature sensor is less than 0.5 ℃.
The medium flows at a speed of 2m/s and 1.2m/s, and the convective heat transfer coefficient of the flow in the tube is calculated. The heat exchange amount depends on the temperature difference between the pipe wall and the medium, and at the beginning of the test, the temperature difference between the pipe wall and the medium is large, so that the heat exchange is severe, the temperature drop of the medium at the inlet and the outlet of the test pipe is obvious, the temperature of the pipe wall is relatively stable after 3 hours, the temperature difference between the pipe wall and the medium is small, and the heat exchange effect is inhibited. However, heat exchange is still the main means, and in view of the thin structure and heat transfer is still not the main factor, the volumetric heat capacity of the soil covered around the test tube in the sandbox is 2J/g cm3The heat conductivity coefficient of air at the periphery of the sandbox is 0.02W/(m.K), which is far less than the heat conductivity coefficient of soil 1.25W/(m.K), the environmental temperature is high, which is equivalent to the heat preservation treatment of the sandbox, the sandbox can be approximately considered to be under the heat insulation condition, and the temperature rise of the soil is not obvious when a single test tube transfers heat to the soil within 3 hours in the test.
The detection result shows that: the comprehensive thermal conductivity of the upper part of the eccentric structure is 5.09W/(m.K) at the average temperature of 25 ℃; the comprehensive thermal conductivity of the lower part of the eccentric structure is 2.37W/(m.K) at the average temperature of 25 ℃.
Namely, the heat conductivity of the steel-plastic grouting composite pipe is higher than that of a PSP steel-plastic composite pipe, a polyethylene pipeline and concrete, and is second to that of a steel pipe, so that the heat conductivity is very good, and heat transfer is facilitated. The eccentric structure is also very beneficial to the upward heat transfer of the fluid for melting snow.
The traditional fluid heating snow melting pipe has single selection and certain problems. The invention solves the problems of corrosion, joint leakage, influence on road surface performance and poor shearing resistance of the plastic pipe in the conventional fluid heating snow melting pipeline.
In addition, the invention is an eccentric pipe. In the processing process, the plastic pipe is internally provided with the plastic pipe under the pressure head of the slurry and naturally floats upwards to be close to or even closely attached to the inner upper wall of the steel pipe, so that the heat conduction performance is excellent, and the heat conduction is very facilitated.
The pipeline is not limited by length, can be flexibly constructed according to the construction requirement of municipal road surfaces, and can be long or short.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical solution of the present invention in any way. Any simple modification, form change and modification of the above embodiments according to the technical spirit of the present invention fall within the scope of the present invention.
Claims (8)
1. A method for preparing a steel-plastic grouting composite pipe for fluid heating snow melting, wherein the steel-plastic grouting composite pipe is composed of a plastic inner pipe, a metal outer pipe and a concrete layer which is formed between the plastic inner pipe and the metal outer pipe through grouting and fills the space between the plastic inner pipe and the metal outer pipe, and the method comprises the following steps:
providing the metal outer tube;
providing the plastic inner pipe, and placing the plastic inner pipe in the metal outer pipe;
plugging two ends of the plastic inner pipe, and injecting water into the plastic inner pipe; and
providing a grouting material or grouting material and pressure-injecting it into the space between the plastic inner pipe and the metal outer pipe to form the concrete layer;
the plastic inner pipe floats upwards and is eccentric in the grouting process, so that the steel-plastic grouting composite pipe is formed into an eccentric pipe, and the geometric center of the section of the plastic inner pipe does not coincide with the geometric center of the section of the metal outer pipe;
wherein the heat conductivity coefficient of the steel-plastic slip casting composite pipe is more than 1.0W/(m.K).
2. The method for preparing a steel-plastic grouting composite pipe for fluid heating snow melting according to claim 1, wherein the grouting or grouting material meets the standard TB/T3192-2008 or JTG/TF 502011.
3. The method for manufacturing a steel-plastic grouting composite pipe for fluid heating snow melting according to claim 1, wherein the grouting or grouting material comprises H-60 grouting agent.
4. The preparation method of the steel-plastic grouting composite pipe for fluid heating snow melting according to claim 1, wherein the pressure during the pressure injection is 1.0-1.4 MPa.
5. The method for preparing a steel-plastic grouting composite pipe for fluid heating snow melting according to claim 1, wherein the grouting speed during the pressure injection is 0.3-0.7 m/s.
6. The method for preparing the steel-plastic grouting composite pipe for fluid heating snow melting according to claim 1, wherein the pressure of water injected into the plastic inner pipe is not more than 0.4 MPA.
7. The method for manufacturing the steel-plastic grouting composite pipe for fluid heating snow melting according to claim 1, further comprising adding solids into the plastic inner pipe before plugging.
8. The method for preparing the steel-plastic grouting composite pipe for fluid heating snow melting according to claim 1, wherein the plastic inner pipe is partially abutted with the metal outer pipe.
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| CN109099260A (en) | 2018-12-28 |
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