CN103851308A - Water feeding pipeline with polystyrene heat preservation layer - Google Patents

Abstract

The invention discloses a water feeding pipeline with a polystyrene heat preservation layer. The water feeding pipeline is formed by a PPR (Pentatricopeptide Repeats) pipe, a polyethylene heat preservation layer and a fiberglass protection shell, wherein the polyethylene heat preservation layer is used outside the PPR pipe, and a heat preservation tile in the position of a connector is coiled and coated by using an aluminum foil tape; the fiberglass protection shell is arranged outside the polyethylene heat preservation layer; an elbow position of the PPR pipe and a pipeline connecting position are buckled by using a polyethylene heat preservation tile and then are well coiled and fixed by the aluminum foil tape; the elbow position of the PPR pipe and the pipeline connecting position are buckled by using a fiberglass protection tile and then are well coiled and fixed by the aluminum foil tape. According to the water feeding pipeline disclosed by the invention, the thickness of the polystyrene heat preservation layer is designed in a way that a severe cold region is divided into three stages according to different frost lines, different recommended embedding depths can be given for different stages, and the thickness of the heat perservation is calculated after the embedding depth is determined, therefore, the water feeding pipeline is more scientific, and the problem of pipeline frost heaving can be effectively solved.

Description

A kind of feedwater piping with polystyrene heat-preservation layer

Technical field:

What the present invention relates to is a kind of feedwater piping with polystyrene heat-preservation layer.

Background technique:

In rural area, China cold area in winter, annual winter and spring are all the peak periods of the phenomenon of water supply and sewerage pipeline generation bursting by freezing booster, and this has brought very big puzzlement to peasant's productive life.It is mainly that water temperature can reduce because 1. villages and small towns pipeline is in the winter time in the situation of intermittent water application that villages and small towns feedwater piping freezes booster, and when water temperature is during lower than zero degree, the frost heave of will freezing in pipeline, causes pipeline generation deformation or break; 2. Pipeline Ground is received various load actions, in the time of level of ground water generation lifting, can produce longitudinal flexural stress, causes pipeline discontinuity, thereby causes the fracture of pipeline.3. due to the impact of Temperature Factor, each local frozen soil degree of depth is different, and generally, pipe laying is below frozen soil line, and feedwater piping can not freeze phenomenon, and feedwater piping lay with frozen soil layer within time, easily freeze.This has affected the normal water supply in rural area greatly, has brought great threat to the normal operation of villages and small towns feedwater piping.For building a New Socialist Countryside, ensure rural potable water safety, guarantee the healthy and sustainable development of rural economy, must guarantee the safe and reliable of water supply and sewerage pipeline operation, it is vital therefore rural area water supply and sewerage pipeline being taked to certain Insulation.

The thickness of earth-fill cover in outdoor water supply pipe road, should determine according to factors such as the soil frost line degree of depth, vehicular load, pipe material and pipeline intersections.In northern China most area, outdoor water supply pipe road is all the buried technology of employing, is embedded in below frost line, relies on the accumulation of heat effect of soil to be incubated, and avoids because too low the causing in pipe of outdoor temperature in winter fed water icing, frost heaving are occurred.But the technology of this buried channelling construction earth volume is larger, especially the north is permitted that all regional level of ground water is higher, and when level of ground water is during higher than frost line, construction amount and difficulty of construction increase severely, and the pipeline laying like this faces frost heave and threatens.Exist especially feedwater piping to cause maintenance expenses higher because buried depth is excessive.

In severe cold area, feedwater piping system of laying has at present:

(1) the buried technology of pipeline: be embedded in the system of laying below frost line by pipeline.

Which can utilize the heat storage capacity of soil own to be incubated pipeline, still due to the existence of Soil Microorganism and moisture, easily causes tube wall corrosion, the engineering work load of which construction is large in addition, the earth volume of construction is large, and when therefore pipeline breaks down, pipeline maintenance is also very inconvenient.This kind of mode exists the problem that pipe base sinks in addition, easily causes pipe joint place seepy question.

(2) electricity companion heating coil road heat preserving mode: heating cable is fixed on to the wall of pipeline by materials such as aluminium foils, the mode that whole system is moved under the monitoring of radiator valve.

The method is safe and reliable to operation, quick construction, but this scheme has relatively high expectations to electrothermal device and corresponding auxiliary facility, and whole companion's heating system must Online Monitoring Control, and therefore investment and operational and administrative expenses are higher.

(3), with heat supply pipeline laying in one ditch mode, be generally by heat distribution pipeline and the parallel layout of water supply and sewerage pipeline.

This paving mode provides heat by the wall temperature of heat distribution pipeline to water supply and sewerage pipeline, its piping layout is comparatively complicated, and if run-down place appears in pipeline, will cause that water quality pollutes mutually, and relating to heat supply company and water utility in the time of construction and management, this makes troubles to operation management.

Visible, people start to adopt more novel pipe laying technology in recent years, as electricity companion heating coil road laying technology, accompany warm laying technology, but due to economy problems, can not promote the use of on a large scale with heat distribution pipeline.

Summary of the invention:

The object of the invention is to overcome the deficiencies in the prior art, a kind of feedwater piping with polystyrene heat-preservation layer is provided.

In order to solve the existing problem of background technique, the present invention by the following technical solutions:

With a feedwater piping for polystyrene heat-preservation layer, it is made up of PPR pipe, polytene heat-insulation layer, glass fibre reinforced plastics containment vessel; Polytene heat-insulation layer is in the external application of PPR pipe, and the insulation tile of joint swathed with a kind of aluminum foil and adhesive tape; Glass fibre reinforced plastics containment vessel is outside polytene heat-insulation layer; At PPR pipe bend place and pipeline junction, buckle with polytene heat-insulation watt, then twine fixing with aluminum foil and adhesive tape; At PPR pipe bend place and pipeline junction, buckle with glass fibre reinforced plastics protection watt, then twine fixing with aluminum foil and adhesive tape.

Further, the way of described glass fibre reinforced plastics containment vessel is that unsaturated polyester ester gum imports well container in proportion, and glass fibre cloth is soaked wherein; then glass fibre cloth is wrapped on thermal insulation layer, after first layer solidifies, then does the second layer; finally be coated with a shell fabric, form glass fibre reinforced plastics protective coating.

Further, described insulation layer thickness be by severe cold area according to frost line difference, divide Three Estate, different brackets provides the different recommendation depth of buryings, determines after the depth of burying, calculates insulation layer thickness.

Further, described frost line classification:

-1.0m～-1.5m is 3 grades, and-1.6m～-2.0m is 2 grades, and-2.0m～-2.5m is 1 grade;

The thickness equations of described thermal insulation layer:

$\ln \frac{d+2\mathrm{\&delta;}}{d}=2\mathrm{\&pi;\&lambda;}[\frac{3.6\mathrm{KZ}}{(G_1{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA0000477117860000012.png,HDA0000477117860000022.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+G_2{C}_2)\ln \frac{t_1-t_0}{t_4-t_0}}-R_1]$

In formula:

δ-insulation layer thickness, m;

λ-select the thermal conductivity of thermal insulating material, w/ (m ℃), in engineering, conventional thermal insulating material has its thermal conductivity of RPUF to be respectively 0.0338;

K-propping up, suspension bracket affect correction factor, and general interior conduit is 1.2, and yard piping is 1.25, chooses 1.25;

Z-keep the uncongealable time, h, considers by the most unfavorable processing condition, chooses 10h;

T ₀-ambient temperature, directly buried pipeline buried depth place soil temperature calculates, ℃,

T ₄the final temperature of-water, considers that certain value more than needed chooses 2 ℃;

T ₁water temperature in-pipeline, ℃; Press 12 ℃ of values of least favorable;

G ₁, G ₂the weight of medium-weight and unit length pipeline material in-difference representation unit length pipe, kg/m ³;

C ₁, C ₂-represent respectively the specific heat capacity of pipeline internal medium and the specific heat at constant pressure of pipeline material,

R1-pipe insulating layer outer surface is to the m ℃/w of heat release resistance of surrounding atmosphere, and DN50 pipeline heat release thermal resistance is 0.2m ℃/w, D-caliber.

The present invention contrasts prior art following beneficial effect: in this patent, the insulation of pipeline can realize by the polyethylene of foam-in-place, and poly thickness is according to different the going out of calculating of the pipe laying degree of depth; In standard, insulation layer thickness was to select according to pipe diameter size in the past, different local, frost line difference, the soil temperature difference of different depth.This patent insulation layer thickness be by severe cold area according to frost line difference, divide Three Estate, different brackets provides the different recommendation depth of buryings, determine after the depth of burying, calculate insulation layer thickness, so have more science, and can effectively solve pipeline problem of frost heave.

Accompanying drawing explanation:

Fig. 1 is feedwater piping structural section map of the present invention.

Fig. 2 is feedwater piping cross section face figure of the present invention.

Fig. 3 is feedwater piping elbow sectional drawing of the present invention.

Fig. 4 is feedwater three-way pipeline sectional drawing of the present invention.

1:ppr feedwater piping in each figure

2: polytene heat-insulation layer

3: glass fibre reinforced plastics containment vessel

Embodiment:

Below in conjunction with the drawings and specific embodiments, the invention will be further described:

Fig. 1 is feedwater piping structural section map of the present invention.Fig. 2 is feedwater piping cross section face figure of the present invention.Fig. 3 is feedwater piping elbow sectional drawing of the present invention.Fig. 4 is feedwater three-way pipeline sectional drawing of the present invention.

The additional polystyrene heat-preservation layer of PPR feedwater piping, smear glass fibre reinforced plastics protective layer, adopt aluminum foil and adhesive tape to wrap up at pipe joint place and twine: wherein inner core tube-PPR pipe has good processibility, can process the prefabricated elbow that forms, threeway etc., the joint of pipeline just all adopts spigot and socket type hot melt to connect; The thermal insulation layer of polyethylene foam moulding, has less heat-transfer coefficient, can prevent freezing up danger; And made the protective layer forming by glass fibre reinforced plastics, there is certain mechanical property waterproof and antiseptic property strong; The joint of last pipeline and pipeline, the aluminum foil and adhesive tape of elbow and threeway place, plays the effect that is fixedly connected with pipeline.

Feedwater piping of the present invention is by (1) inner core tube-PPR pipe; ppr material has good processibility; can process and be prefabricated into elbow; threeway etc., joint goes out to adopt spigot and socket type hot melt to connect, the thermal insulation layer that (2) polytene heat-insulation layer can foam-in-place moulding; in order to prevent freezing up danger; insulation layer thickness value reference form above, (3) are made the protective layer forming by glass fibre reinforced plastics, have certain mechanical property waterproof and antiseptic property strong.(4) joint of pipeline and pipeline, the aluminum foil and adhesive tape of elbow and threeway place, plays the effect that is fixedly connected with pipeline.

Specific practice is as follows: become thermal insulation layer in the foam-in-place of PPR pipe external application polystyrene, the insulation tile of joint is swathed with a kind of aluminum foil and adhesive tape, do thermal insulation layer.The way of glass fibre reinforced plastics containment vessel is that unsaturated polyester ester gum imports well container in proportion, and glass fibre cloth is soaked wherein, then glass fibre cloth is wrapped on thermal insulation layer, after first layer solidifies, then does the second layer, is finally coated with a shell fabric, forms glass fibre reinforced plastics protective coating.Be that polytene heat-insulation watt is buckled in to the prefabricated channel bend place forming in elbow and pipeline junction construction process, then twine fixing with aluminum foil and adhesive tape.

I,, according to following formula, calculate certain several areas (frost line-2.3m ,-1.8m;-1.4m), be divided into different ranks according to frost line; take polystyrene heat-preservation layer as example take DN50PPR feedwater piping, and while adding glass fibre reinforced plastics containment vessel polystyrene heat-preservation layer thickness as shown in the formula

$\ln \frac{d+2\mathrm{\&delta;}}{d}=2\mathrm{\&pi;\&lambda;}[\frac{3.6\mathrm{KZ}}{(G_1{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA0000477117860000012.png,HDA0000477117860000022.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+G_2{C}_2)\ln \frac{t_1-t_0}{t_4-t_0}}-R_1]$

In formula:

δ-insulation layer thickness, m;

λ-select the thermal conductivity of thermal insulating material, w/ (m ℃), in engineering, conventional thermal insulating material has its thermal conductivity of RPUF to be respectively 0.0338;

K-propping up, suspension bracket affect correction factor, and general interior conduit is 1.2, and yard piping is 1.25, chooses 1.25;

Z-keep the uncongealable time, h, considers by the most unfavorable processing condition, chooses 10h;

T ₀-ambient temperature, directly buried pipeline buried depth place soil temperature calculates, ℃,

T ₄the final temperature of-water, considers that certain value more than needed chooses 2 ℃;

T ₁water temperature in-pipeline, ℃; By 12 ℃ of (pressing least favorable) values;

G ₁, G ₂the weight of medium-weight and unit length pipeline material in-difference representation unit length pipe, kg/m ³;

C ₁, C ₂-represent respectively the specific heat capacity of pipeline internal medium and the specific heat at constant pressure of pipeline material,

R ₁-pipe insulating layer outer surface is to the m ℃/w of heat release resistance of surrounding atmosphere, and DN50 pipeline heat release thermal resistance is 0.2m ℃/w, D-caliber,

(1) by numerical calculation, obtained certain cities and towns frost line-2.3m and belonged to 1 grade of area, while there is not freezing up danger in feedwater piping in guaranteeing to stop supplying water latter 10 hours, the shallow embedding degree of depth of recommendation and corresponding insulation layer thickness.(herein all take the PPR pipe of DN50 as example)

So in the time that local frost line is between 2.0m～2.5m, can with reference to more than.

(2) belong to 2 grades of regional feedwater pipings for certain cities and towns (ice east line-1.8m) does not send out/give birth to freezing up when dangerous in guaranteeing to stop supplying water latter 10 hours, the shallow embedding degree of depth of recommendation and accordingly insulation layer thickness.

Recommend buried depth	Recommend insulation layer thickness
		0.8	70mm
0.9	60mm
		1	50mm
1.1	50mm
		1.2	40mm
1.3	40mm
		1.4	30mm

So when local frost line is during at-1.5m～-1.9m, feedwater piping shallow embedding and insulation layer thickness can with reference to more than.

(3) certain city (frost line-1.4m) belongs to 1 grade of area, while there is not freezing up danger in feedwater piping in guaranteeing to stop supplying water latter 10 hours, and the shallow embedding degree of depth of recommendation and corresponding insulation layer thickness.

Recommend buried depth	Recommend insulation layer thickness
		0.8	70mm
0.9	60mm
		1	50mm
1.1	40mm
		1.2	40mm

When local frost line is at-1m～-1.4m, the feedwater piping shallow embedding anti-freeze expansion technology construction of additional thermal insulation layer can be above can with reference to more than.

This programme has the following advantages:

1. this programme takes additional thermal insulation layer measure that feedwater piping is become to shallow embedding in the depth of burying of recommending by being embedded under frost line, reduces the engineering work load of construction, is convenient to conduit running safety inspection.

2. by adding containment vessel outward at pipe insulating layer, improve water-proof performance and the antiseptic property of pipeline, to prevent that pipeline from freezing up harm occurring in the winter time.

3. take the meteorologic parameter in certain cities and towns as example, by designing and calculating, provide the feedwater piping heat preserving method that adopts additional containment vessel in locality the adoptable adaptation shallow embedding degree of depth and corresponding insulation layer thickness.

4. this programme has formed a set of complete scheme, for the severe cold area (take Daqing Area frost line-2.4m as example) in be greater than-1.5m of frost line area, provides buried depth and the corresponding insulation layer thickness of recommendation.

5. the shallow embedding technology of the additional thermal insulation layer of feedwater piping is to adopt the additional polystyrene heat-preservation layer of PPR feedwater piping (the prefabricated elbow forming of PPR and threeway); smear glass fibre reinforced plastics protective layer; adopt aluminum foil and adhesive tape to wrap up in the technology of twining at pipe joint place, recommend buried depth and insulation layer thickness to realize the effect of shallow-buried pipeline and anti-freeze expansion according to scheme.

6. in villages and small towns, severe cold area, (sunlight village, red flag town, Daqing Area) applies this standard, can guarantee to stop at villages and small towns intermittent water application, and in 10 hours, frost heaving does not occur pipeline.

7. poly thickness is according to different the going out of calculating of the pipe laying degree of depth, in standard, insulation layer thickness was to select according to pipe diameter size in the past, different local, frost line difference, the soil temperature difference of different depth, this patent insulation layer thickness is according to frost line difference by severe cold area, divide Three Estate, different brackets provides the different recommendation depth of buryings, determines after the depth of burying, calculate insulation layer thickness, so have more science.

8. design is to mark off three areas according to the frost line degree of depth, provides the suitable shallow embedding degree of depth and corresponding insulation layer thickness according to different regions.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (4)

1. the feedwater piping with polystyrene heat-preservation layer, is characterized in that, it is made up of PPR pipe, polytene heat-insulation layer, glass fibre reinforced plastics containment vessel;

Polytene heat-insulation layer is in the external application of PPR pipe, and the insulation tile of joint swathed with a kind of aluminum foil and adhesive tape;

Glass fibre reinforced plastics containment vessel is outside polytene heat-insulation layer;

At PPR pipe bend place and pipeline junction, buckle with polytene heat-insulation watt, then twine fixing with aluminum foil and adhesive tape;

At PPR pipe bend place and pipeline junction, buckle with glass fibre reinforced plastics protection watt, then twine fixing with aluminum foil and adhesive tape.

2. a kind of feedwater piping with polystyrene heat-preservation layer as claimed in claim 1; it is characterized in that; the way of described glass fibre reinforced plastics containment vessel is that unsaturated polyester ester gum imports well container in proportion; glass fibre cloth is soaked wherein; then glass fibre cloth is wrapped on thermal insulation layer, after first layer solidifies, then does the second layer; finally be coated with a shell fabric, form glass fibre reinforced plastics protective coating.

3. a kind of feedwater piping with polystyrene heat-preservation layer as claimed in claim 1, it is characterized in that, described insulation layer thickness is according to frost line difference by severe cold area, divide Three Estate, different brackets provides the different recommendation depth of buryings, determine after the depth of burying, calculate insulation layer thickness.

4. a kind of feedwater piping with polystyrene heat-preservation layer as claimed in claim 3, is characterized in that, described frost line classification:

-1.0m～-1.5m is 3 grades, and-1.6m～-2.0m is 2 grades, and-2.0m～-2.5m is 1 grade;

The thickness equations of described thermal insulation layer:

$\ln \frac{d+2\mathrm{\&delta;}}{d}=2\mathrm{\&pi;\&lambda;}[\frac{3.6\mathrm{KZ}}{(G_1{C}_1+G_2{C}_2)\ln \frac{t_1-t_0}{t_4-t_0}}-R_1]$

In formula:

δ-insulation layer thickness, m;

λ-select the thermal conductivity of thermal insulating material, w/ (m ℃), in engineering, conventional thermal insulating material has its thermal conductivity of RPUF to be respectively 0.0338;

K-propping up, suspension bracket affect correction factor, and general interior conduit is 1.2, and yard piping is 1.25, chooses 1.25;

Z-keep the uncongealable time, h, considers by the most unfavorable processing condition, chooses 10h;

T ₀-ambient temperature, directly buried pipeline buried depth place soil temperature calculates, ℃,

T ₄the final temperature of-water, considers that certain value more than needed chooses 2 ℃;

T ₁water temperature in-pipeline, ℃; Press 12 ℃ of values of least favorable;

G ₁, G ₂the weight of medium-weight and unit length pipeline material in-difference representation unit length pipe, kg/m ³;

C ₁, C ₂-represent respectively the specific heat capacity of pipeline internal medium and the specific heat at constant pressure of pipeline material,

R ₁-pipe insulating layer outer surface is to the m ℃/w of heat release resistance of surrounding atmosphere, and DN50 pipeline heat release thermal resistance is 0.2m ℃/w,

D-caliber.

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