CN108930844B - Steel-plastic grouting composite pipe for heating and melting snow by fluid - Google Patents
Steel-plastic grouting composite pipe for heating and melting snow by fluid Download PDFInfo
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- CN108930844B CN108930844B CN201810938784.0A CN201810938784A CN108930844B CN 108930844 B CN108930844 B CN 108930844B CN 201810938784 A CN201810938784 A CN 201810938784A CN 108930844 B CN108930844 B CN 108930844B
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- 229920003023 plastic Polymers 0.000 title claims abstract description 133
- 239000004033 plastic Substances 0.000 title claims abstract description 133
- 239000002131 composite material Substances 0.000 title claims abstract description 57
- 239000012530 fluid Substances 0.000 title claims abstract description 38
- 238000002844 melting Methods 0.000 title claims abstract description 34
- 230000008018 melting Effects 0.000 title claims abstract description 28
- 238000010438 heat treatment Methods 0.000 title claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 46
- 239000004567 concrete Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims description 32
- 229910000831 Steel Inorganic materials 0.000 claims description 27
- 239000010959 steel Substances 0.000 claims description 27
- -1 polyethylene Polymers 0.000 claims description 16
- 239000004698 Polyethylene Substances 0.000 claims description 12
- 229920000573 polyethylene Polymers 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 230000007797 corrosion Effects 0.000 abstract description 12
- 238000005260 corrosion Methods 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 9
- 239000002689 soil Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000012546 transfer Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229920001169 thermoplastic Polymers 0.000 description 5
- 244000035744 Hura crepitans Species 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 239000004416 thermosoftening plastic Substances 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229920001187 thermosetting polymer Polymers 0.000 description 3
- 229930040373 Paraformaldehyde Natural products 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000004831 Hot glue Substances 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
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- 238000004321 preservation Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
-
- 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
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/30—Heating of pipes or pipe systems
- F16L53/32—Heating of pipes or pipe systems using hot fluids
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a steel-plastic grouting composite pipe for heating and melting snow by fluid, 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 through grouting and fills the space between the plastic inner pipe and the metal outer pipe. The composite pipe has long service life, strong corrosion resistance, small influence on the fracture resistance of the concrete pavement and strong heat conduction performance.
Description
Technical Field
The invention relates to the technical field of pavement snow melting, in particular to a steel-plastic grouting composite pipe for heating and melting snow by fluid.
Background
The fluid heating and snow-melting system uses the power system to flexibly convey the energy of an external heat source by taking the hot fluid as a carrier so as to realize snow melting, and compared with passive snow melting modes such as chemical snow melting agent spreading, mechanical deicing and snow melting methods and the like, the fluid heating and snow-melting system can carry out preventive active snow removal according to the snow fall and weather conditions, has strong system controllability, high energy utilization rate, wide heat source (can be a conventional heat source or a renewable heat source) and is simple and convenient to install.
The fluid heating and snow melting system is characterized in that a circulating pump is utilized to enable a hot fluid to circulate in a pipeline buried in the road surface, heat of the fluid is transferred to the road surface structure in a convection heat exchange mode at the pipe wall, heat is transferred to the surface of the road body by means of heat conduction in the structural layer, and heat exchange is carried out with ice and snow through heat transfer, so that the aim of melting snow and ice is achieved. In the system, low freezing point solutions such as propylene glycol aqueous solution, ethylene glycol aqueous solution and the like can be used as circulating mediums; the pipes buried in the pavement need to have good temperature resistance, corrosion resistance, and strength and flexibility, so as to have good resistance to fluid erosion in the pipes and to the action of pavement loads such as automobile and airplane loads during construction and installation and during use.
Currently, fluid heating pipe materials generally include 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 generally added with antifreeze and has micro corrosiveness, the steel pipe is not suitable to be directly used as a heating pipe.
The plastic pipe is made of synthetic resin, i.e. polyester, and is extruded in plastic pipe making machine, and is used mainly as water supply pipe, drainage, exhaust and sewage pipe, underground drainage pipe system, rain pipe, wire pipe, etc. Plastic pipes are divided into two main categories, thermoplastic and thermosetting. Belongs to thermoplastic polyvinyl chloride pipes, polyethylene pipes, polypropylene pipes, polyoxymethylene pipes and the like; belongs to thermosetting phenol 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 the thermoplastic pipe; but the heat-conducting property and the fracture-resistant and compression-resistant properties of the plastic pipe are poor. When the impact force of traffic load on the road surfaces is large or the road panels are dislocated, the plastic pipe has weak resistance and is cut off to form leakage.
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 plastic as an inner layer and an outer layer, adopts special hot melt adhesive, and is compounded into an integrated pipe through an extrusion molding method. The pipe overcomes the defects of easy corrosion, pollution, heavy weight, short service life, low strength, large expansion and easy deformation of the plastic pipe, and has the common advantages of the steel pipe and the plastic pipe, such as good oxygen isolation performance, higher rigidity, easy detection of the buried pipe, and the like. However, the PSP steel-plastic composite pipe has the defects of smaller overall strength and poorer heat conduction performance. In addition, when the PSP steel-plastic composite pipe is adopted, a hot melting joint or an electric melting joint is needed to be arranged at the longest 12m of the long-distance conveying pipeline, and at least 4 joints are needed for the example of the F-class runway design width of 60 m. If the runway construction process is combined, one joint is needed at 5m, and at least 11 joints are needed at 60 m. More joints may create a risk of fluid leakage.
Therefore, a new pipeline is needed to solve the above technical problems.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide the steel-plastic grouting composite pipe for heating and melting the snow by fluid and the preparation method, and the composite pipe has long service life, strong corrosion resistance, small influence on the fracture resistance of a concrete pavement and strong heat conduction performance.
According to an aspect of the present invention, there is provided a steel-plastic grouting composite pipe for fluid heating and snow melting, 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 a space therebetween.
According to one embodiment of the invention, wherein the 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 grouting composite pipe is 1-60 m.
According to one embodiment of the invention, the steel-plastic grouting composite pipe is an eccentric pipe, and the geometric center of the section of the plastic inner pipe is not coincident with the geometric center of the section of the metal outer pipe.
According to one embodiment of the invention, the plastic inner tube is locally abutted against the metal outer tube.
According to one embodiment of the invention, the grouting material or grouting material used in grouting is compliant with the standard TB/T3192-2008 or JTG/TF502011.
According to one embodiment of the invention, wherein the grouting material or grouting material comprises an H-60 grouting agent.
According to one embodiment of the invention, wherein the thermal conductivity of the steel-plastic slip-casting composite pipe is 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), etc.
According to another aspect of the present invention, there is provided a method of manufacturing a steel-plastic grouting composite pipe for fluid heating and 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 tube and placing the plastic inner tube into the metal outer tube; and
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 the concrete layer.
According to one embodiment of the invention, wherein the grouting material or grouting material meets the standard TB/T3192-2008 or JTG/TF502011.
According to one embodiment of the invention, wherein the grouting material or grouting material comprises an H-60 grouting agent.
According to one embodiment of the invention, the pressure at the time of injection is about 1.0 to 1.4MPa, preferably 1.1 to 1.3MPa, more preferably 1.2MPa.
According to one embodiment of the invention, the grouting speed at the time of the pressure grouting is about 0.3-0.7m/s, preferably 0.5m/s.
According to one embodiment of the invention, the method for preparing the steel-plastic grouting composite pipe for heating and melting snow by fluid further comprises the steps of plugging two ends of the plastic pipe and injecting water into the plastic pipe before the injection.
According to one embodiment of the invention, the pressure of the injected water in the plastic tube does not exceed 0.4MPA.
According to one embodiment of the invention, the method for manufacturing a steel-plastic grouting composite pipe for fluid heating and snow melting further comprises the step of adding solids, such as finer weights, such as steel wires, to the plastic pipe before plugging, for adjusting the weight of the plastic pipe.
The invention solves a plurality of technical problems of the pipe materials selected in the past of the fluid heating snow melting system, and has the beneficial technical effects that:
1) The service life can be up to 50 years. The service life of the plastic pipe can reach 50 years, so that the plastic pipe at the innermost layer bears the heating fluid conveying function, and the service life of the pipeline exceeding the design life of the road surface (30 years generally) can be realized.
2) The corrosion resistance is strong. The steel pipe has weak corrosion resistance, is not suitable for conveying heating fluid, has strongest corrosion resistance, and can be used for directly conveying fluid. The steel pipe is used as the outer protective shell of the plastic pipe, mortar is filled between the steel pipe and the outer protective shell, 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 than PSP pipe and plastic pipe. Thus, good heat conduction and snow melting effect can be achieved.
Drawings
Fig. 1 is a schematic view of a steel-plastic grouting composite pipe for fluid heating and snow melting according to an embodiment of the present invention.
Fig. 2 is a schematic flow diagram of a method of making a steel-plastic slip-cast composite pipe for fluid heating to melt snow, according to one embodiment of the invention.
FIG. 3 is a schematic diagram of a structure for detecting thermal conductivity of a pipe using a sandbox model according to one embodiment of the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are not intended to limit the invention thereto.
Fig. 1 is a schematic view of a steel-plastic grouting composite pipe for fluid heating and snow melting according to an embodiment of the present invention. As shown in fig. 1, the steel-plastic slip-cast composite pipe includes three parts, namely, 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 up a space between the two, and a high temperature fluid 40 for supplying heat 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 an appropriate type of steel tube may be specifically selected as needed. The length, diameter, etc. of the steel pipes may be selected according to specific needs, for example, when a long length, for example, 60 meters, is required, a plurality of steel pipes may be wire-bonded or welded. The metal outer pipe 10 is used as an outer layer pipe, and can provide good strength and protection for the steel-plastic grouting composite pipe.
The plastic inner tube 30 may be a thermoplastic plastic tube or 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 may be selected as desired, for example, the inner diameter may be selected to provide a desired 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-20mm, e.g., 6mm, 7mm, 8mm, 10mm, 15mm, etc. Those skilled in the art can readily select an appropriate diameter as desired. The length of the plastic inner tube 30 may be suitably cut out as required, for example, 1m, 5m, 10m, 30m, 60m, etc.
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 of tube. According to one embodiment of the invention, wherein the plastic inner tube 30 is a De25 polyethylene tube.
In order to ensure the snow melting effect and enhance heat conduction, the invention fills and compacts 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 comprises 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 up the space therebetween. The concrete layer 20 fixes the plastic inner tube 30 and also provides support for the metal outer tube 10, so that the composite tube is stronger in the whole, and the technical effects of compression resistance, impact resistance, strong corrosion resistance, good heat conducting performance, long service life and the like are realized.
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 hollows and bubbles, and 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, which is significantly better than that of plastic pipe or PSP pipe, for example, it may have a thermal conductivity greater than 1.0W/(mK), such as 2.0, 3.0, 4.0, 5.0W/(mK), etc.
For this purpose, for example, those grouting materials or grouting materials which meet the standard TB/T3192-2008 or JTG/TF502011 may be preferred, more preferably those grouting materials or grouting materials which comprise H-60 grouting agents. Based on the teachings of the present invention in combination with the prior art, one skilled in the art can readily select an appropriate 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 tube 30 and the metal outer tube 10 is not uniform. For example, the thickness of the concrete layer 20 is shown to be gradually reduced from top to bottom, with the upper thickness being smaller than the lower thickness. Further, the top portion 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 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 conductive property of the upper portion of the composite pipe is better, and heat energy is more easily conducted to the ground, so that 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 fig. 2. Referring to fig. 2, the method for preparing the steel-plastic grouting composite pipe for heating and melting snow by fluid according to the invention can comprise the following steps:
First, the metal outer tube 10 is provided, and an appropriate metal pipe such as DN32 steel tube may be selected as needed. The length, diameter and the like of the steel pipes can be selected according to specific requirements, for example, when a longer length such as 60 meters is required, a plurality of steel pipes can be welded;
a plastic inner tube 30 is provided and placed in a metal outer tube, for example a De25 polyvinyl chloride tube may be provided, and the whole plastic tube is threaded by means of manual or mechanical pulling or the like. The diameter of the plastic tube may be selected according to the design flow rate of the snow-melting fluid, and its outer diameter is suitably smaller than the inner diameter of the metal outer tube. For example, the difference between the two may be 5mm-30mm, e.g., 6mm, 7mm, 8mm, 10mm, 1mm,20mm,25mm, etc. The length of the plastic inner tube 30 can be cut according to the degree of the metal outer tube, for example, the length of the plastic inner tube can be appropriately slightly longer than that of the metal outer tube, and the lengths of the two side ends of the plastic tube are reserved so as to facilitate the subsequent operation;
Grouting 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 material or grouting material may be selected from those meeting the standards TB/T3192-2008 or JTG/TF502011, preferably those comprising H-60 grouting agent. The prepared grouting material or grouting material is pressed into a pipeline gap layer (namely the space between the plastic inner pipe and the metal outer pipe) by grouting equipment. The grouting pressure may be appropriately selected according to the specific circumstances, and may be, for example, 1.0 to 1.4MPa, for example, 1.1MPa, 1.2MPa, 1.3MPa. The proper grouting speed can be controlled, for example, 0.3-0.7m/s, for example, about 0.5m/s, and the grouting time of each pipe can be properly controlled and selected, for example, the grouting time of each pipe can be 1.5-3 minutes, 2-2.5 minutes. Grouting equipment is well known to those skilled in the art and is not described in detail herein.
Due to the combined action of gravity and buoyancy of the fluid, the plastic inner pipe 30 floats and decenters 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 the geometric center of the section of the metal outer pipe, and even the top of the plastic inner pipe is partially abutted against the inner wall of the metal outer pipe. When such an eccentric pipe is buried underground 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 conductive property of the upper portion of the composite pipe is better, and the heat energy is more easily conducted to the ground, so that 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 pipe 30 before 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 incorporate weights, such as steel wires or the like, into the plastic inner tube to adjust the weight of the plastic inner tube and to adjust the degree of eccentricity, whereby even the composite tube can be made non-eccentric. At the same time, the water injection also helps to maintain the internal pressure of the plastic inner tube 30, preventing the plastic inner tube 30 from collapsing during the grouting process. A step of
As will be readily appreciated by those skilled in the art. An appropriate water injection pressure may be chosen to prevent the water injection pressure from being too high to cause the plastic tube to expand, e.g. the pressure of the injected water may not exceed 0.4MPa. After the slurry has set, the water or other weights within the plastic tube may be removed.
The invention is further illustrated below in conjunction with examples.
Example-preparation of Steel-Plastic grouting composite pipe and detection of Performance parameters
Materials and parameters:
the metal outer tube is DN32 welded steel tube with the length of 24 meters, the outer diameter of 41.23mm and the wall thickness of 2.47mm;
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 3.1mm;
Grouting material: water, grouting agent (H-60), cement, reference standard TB/T3192-2008 in a weight ratio of 30:10:90;
grouting pressure: about 1.2MPa, grouting speed: about 0.5m/s or so;
The plastic inner tube is filled with water, two ends are blocked, and the pressure in the tube is about 0.4MPa;
The method is used for preparing the steel-plastic grouting composite pipe, a plurality of samples are averaged, and the length of the finally obtained steel-plastic grouting composite pipe is 2496mm and the eccentricity is 4mm;
In addition, DN32 welded steel pipe, de25 polyethylene pipe, de25PSP steel-plastic composite pipe were used as control groups. 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 of test method for the long-term performance and durability of ordinary concrete and GBT 50081-2002 standard of test method for the mechanical properties of ordinary concrete, and finally the added FC fiber of the invention and other control pipes is obtained, and the flexural strength of 28d concrete after pipe addition is obtained: as shown in the table above, the steel-plastic grouting composite pipe provided by the invention has better concrete flexural strength, is higher than the requirement of 5.0MPa of design standard, and has better performance than most other control pipes.
The heat conduction performance is detected as follows:
The test pipe sections (comprising the steel-plastic grouting composite pipe, DN32 welded steel pipe, de25PSP steel-plastic composite pipe and De25 polyethylene pipe) are respectively buried in soil with a heat conductivity coefficient of 1.25W/m.K, the center axle of the pipe is 1m away from the ground, hot water with a temperature of 40 ℃ circularly flows in the pipe at a speed of 2.0m/s and 1.2m/s by utilizing a constant-temperature water bath, and a thermal resistance type temperature sensor (for measuring the pipe wall temperature and shown by black dots in fig. 3) and a thermal flow sensor sheet are respectively arranged at the top and bottom of the pipe at the center of the length direction of the test pipe section; in the soil at a distance of 0.95m from the top of the pipe, 3 heat-resistant temperature sensors (No. 1,2, 3, interval of 0.3m, measurement of soil temperature near the soil surface, see fig. 3) were arranged in the axial direction of the pipe section.
The temperature of the test environment is 30 ℃, the test environment is stable for 3 hours, and the numerical fluctuation of the temperature sensor is less than 0.5 ℃.
The medium was flowed at a speed of 2m/s and 1.2m/s, and the convective heat transfer coefficient of the flow in the tube was calculated. The heat exchange quantity depends on the temperature difference between the pipe wall and the medium, and in the beginning stage of the test, the temperature difference between the pipe wall and the medium is large, so that the heat exchange is more severe, the medium temperature at the inlet and the outlet of the test pipe is obviously reduced, the pipe wall temperature 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, in view of the fact that the structure is thinner, heat transfer is still not the main factor, the volumetric heat capacity of soil covered around the test tube in the sandbox is 2J/g.cm 3 through table lookup, the air heat conductivity coefficient of the periphery of the sandbox is 0.02W/(m.K), and is far smaller than the soil heat conductivity coefficient of 1.25W/(m.K), the environment temperature is higher, which is equivalent to heat preservation treatment of the sandbox, and the single test tube can be approximately considered to transfer heat to soil for 3 hours under the adiabatic condition during the test, so that the soil temperature rise is not obvious.
The detection result shows that: the upper comprehensive heat conductivity coefficient of the eccentric structure is λ25=5.09W/(m.K) at the average temperature of 25 ℃; the overall thermal conductivity of the lower part of the eccentric structure is λ25=2.37W/(m·k) at an average temperature of 25 ℃.
Namely, the steel-plastic grouting composite pipe has higher heat conduction performance than PSP steel-plastic composite pipes, polyethylene pipelines and concrete, and is inferior to steel pipes, so that the steel-plastic grouting composite pipe has very good heat conduction performance and is beneficial to heat transfer. The eccentric structure is also very beneficial to upward heat transfer and snow melting of the fluid.
The prior fluid heating snow melting pipe material has single choice and certain problems. The invention solves some common problems of fluid heating snow melting pipelines, such as corrosion, joint leakage, influence on road surface performance and poor shearing resistance of plastic pipes.
In addition, the present invention is an eccentric tube. In the processing process, the plastic pipe is arranged under the pressure head of the slurry and naturally floats upwards, and is close to or even clings to the upper wall inside the steel pipe, so that the heat conduction performance is excellent, and the heat conduction is very beneficial.
The pipeline is not limited by the length, can be flexibly constructed according to the construction requirements of municipal road surfaces, and can be long or short.
The foregoing is merely 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 variation and modification of the above embodiments according to the technical substance of the present invention fall within the protection scope of the present invention.
Claims (8)
1. A steel-plastic grouting composite pipe for heating and melting snow of fluid 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 through grouting and fills the space between the plastic inner pipe and the metal outer pipe;
the steel-plastic grouting composite pipe is an eccentric pipe, and the geometric center of the section of the plastic inner pipe is not overlapped with the geometric center of the section of the metal outer pipe; the heat conductivity coefficient of the steel-plastic grouting composite pipe is greater than 1.0W/(m.K).
2. The steel-plastic slip-cast composite pipe of claim 1, wherein the plastic inner pipe is a polyethylene pipe.
3. The steel plastic slip-cast composite pipe of claim 2, wherein the polyethylene pipe is a De25 plastic pipe.
4. The steel-plastic slip-cast composite pipe of claim 1, wherein the metal outer pipe is a DN32 steel pipe.
5. The steel-plastic injected composite pipe of claim 1, wherein the steel-plastic injected composite pipe has a length of 1-60 meters.
6. The steel-plastic slip-cast composite tube of claim 1, wherein the plastic inner tube partially abuts the metal outer tube.
7. The steel-plastic grouting composite pipe according to claim 1, wherein grouting material or grouting material used in grouting meets standard TB/T3192-2008 or JTG/TF502011.
8. The steel-plastic grouting composite pipe of claim 7, wherein the grouting material or grouting material comprises H-60 grouting agent.
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| CN112959705A (en) * | 2021-02-04 | 2021-06-15 | 广东韶钢松山股份有限公司 | Production process of wear-resistant composite pipe filled with adhesive mortar |
| CN114591041B (en) * | 2022-03-21 | 2023-05-09 | 绍兴市水联管业有限公司 | Filling concrete formula for composite pipe fitting |
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