CN204004849U - A kind of heavy caliber with sacrificial anode is given, waste pipe push pipe - Google Patents
A kind of heavy caliber with sacrificial anode is given, waste pipe push pipe Download PDFInfo
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- CN204004849U CN204004849U CN201420316756.2U CN201420316756U CN204004849U CN 204004849 U CN204004849 U CN 204004849U CN 201420316756 U CN201420316756 U CN 201420316756U CN 204004849 U CN204004849 U CN 204004849U
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- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The utility model discloses a kind of heavy caliber with sacrificial anode to, waste pipe push pipe, comprise internal layer steel cylinder, outer steel cylinder, strengthen structure, Concrete Filled structure, outer concrete layer, internal layer concrete layer; Described enhancing structure is located between internal layer steel cylinder and outer steel cylinder, described enhancing structure is specially and is wound around the steel band that internal layer steel cylinder is outer and be welded and fixed with internal layer steel cylinder and outer steel cylinder, and described Concrete Filled structure is at internal layer steel cylinder, outer steel cylinder and strengthen in the space between structure; In described outer concrete layer, be also provided with sacrificial anode and steel leg, the surface of contact of described sacrificial anode and outer concrete layer is provided with insulation coating.The utility model anti-corrosion effects is good, durable in use, and working process is simple, reduces weight and cost of production in meeting Rigidity and strength, has larger society and economic value.
Description
Technical field
The utility model belongs to municipal administration, industry, mining industry etc. and uses pipeline field, provides especially a kind of heavy caliber with sacrificial anode to, waste pipe push pipe.
Background technique
Along with the sustained and rapid development of China's economy, urban size expands rapidly, and supplying water appears in increasing city, draining difficulty.Build extensive water delivery engineering very urgent, adopting pipe laying waterline is necessary selection scheme.At present, alternative pipeline has steel pipe, concrete pipe, concrete reinforced pipe, prestressed concrete pipe.Wherein, the maximum nominal bore diameter that does not configure the concrete pipe of steel structure in tube wall only has 600mm, is only suitable for the little discharge capacity applications that supplies, and extensive water delivery engineering must be selected other several pipelines.The principal element of considering while selecting pipeline has: reliable degree, construction and two aspects of maintenance cost.
Steel pipe is large from heavy and light, rigidity, but cost high, be subject to environmental corrosion, later maintenance expense is high.For reducing engineering cost, builder is current is more to select steel and the compound pipeline of concrete.Except cost is low, bi-material has made up weakness each other mutually, performance strong point separately, thus make steel/concrete composite pipe there is very high bearing capacity, general all higher than the steel and the independent bearing capacity sum of concrete that form pipeline.In addition, there is passivation because the alkalescence of concrete self can make steel surface, greatly improved the corrosion resistance of steel in concrete.
But the steel structure concrete pipe of existing Production and application standard exists again deficiency at present, is restricting and is applying.Steel in steel structure concrete pipe mostly adopt high tensile steel at present, and object is to improve bearing capacity and reduce deadweight.As the Twisted Steel of regulation in " push pipe reinforced concrete pipe standards " should meet " JC/T540 ", specify that the minimum yield strength of Deformed Steel Bars used is 550MPa.And the yield strength of cold drawn wire in prestressed concrete pipe (PCCP) is generally more than 1550MPa, according to IISI's mechanical properties of materials---intensity is classified, this class steel structure belongs to high-strength steel (270---700MPa) and super-high strength steel (>700MPa).Practice shows, this class steel counter stress corrosion cracking sensitivity.Stress corrosion cracking is the cracking that material causes under stress and corrosive environment acting in conjunction, and this is stress and the symphyogenetic result of corrosion.If only have an aspect, stress or medium effect, cracking destruction can not occur, but in the time of the two synergy, but can ftracture very soon.Therefore, occur when stress corrosion cracking, stress may be very low, and the corrosivity of medium may be also very weak, and also, just due to so, stress corrosion cracking is often ignored, and causes contingency constantly to occur.Conventionally in specific industrial environment, there is stress corrosion cracking in Ordinary Steel, high-strength steel in physical environment, as there is stress corrosion cracking in rainwater, seawater.In addition, due to the development of the modern industry, material working environment is more and more harsher, and stress corrosion problem also becomes increasingly conspicuous.
The concrete pipe made from current standard, adopt high-strength steel structure is the in the situation that of its concrete degradation failure, and risk can constantly increase.And present stage to transporting on a large scale engineering, as the life requirement of waterline also improved a lot more in the past, be increased to 50-100 from 20-30, therefore, need the better tubing of development durability badly to meet the demands.
In addition, for the push pipe pipeline of heavy caliber, buried dark, long distance, cathodic protection faces needs the urgent difficult problem solving:
For the structure of push pipe pipeline, first cathodic protection worker can expect utilizing the distributing point of active well as sacrificial anode.But waterline is that current single jacking distance is longer, and the near distance between two the longest active wells can reach several kilometers.Because cathodic protection adopts sacrificial anode, and the guard space of sacrificial anode is little compared with impressed current, only can meet active well attached compared with the cathodic protection of short tube line with active well as feed, that is to say, in the middle of pipeline, must increase distributing point.But pipeline is buried so dark, do not allow again to carry out excavation construction, how realizing pipeline feed becomes primary technical barrier.
In the cathodic protection of published steel push pipe, adopt, from the method for surface drilling remote welding, conductive cable is welded on to steel tube surface.The electrical spark that welding produces in welding process has the ability to penetrate the coating of steel tube surface, thereby cable front solder joint and outer wall of steel pipe are welded together.And the push pipe being wrapped up by thicker concrete for appearance, electrical spark can not melt outer wall of steel pipe metal through this layer concrete and weld feed cable.If from surface drilling remote welding cable, can only select the birdsmouth of pipeline.But the steel length at birdsmouth place is too short, be difficult to implement from earth's surface exactly.In addition, adopting the object of push pipe is in order not destroy earth's surface and underground Infrastructure, constructs to carry out cathodic protection and naturally can be subject to a lot of restrictions from earth's surface, therefore cannot carry out from earth's surface cathodic protection construction.
Model utility content
The purpose of this utility model is to solve the problem that prior art exists; the utility model is abandoned high tensile steel and is adopted Ordinary Steel material to increase its corrosion resistance; for ensureing its intensity; reform the steel structure mode of steel structure concrete composite pipe; and consider the problem of cathodic protection, the heavy caliber with sacrificial anode that a kind of high strength, corrosion-resistant, low cost, low weight be provided is to, waste pipe push pipe.
The technical solution of the utility model is: a kind of heavy caliber with sacrificial anode is given, waste pipe push pipe, and described heavy caliber is given, waste pipe push pipe comprises internal layer steel cylinder 1, outer steel cylinder 2, strengthen structure 3, Concrete Filled structure 4, outer concrete layer 5, internal layer concrete layer 6; Described enhancing structure 3 is located between internal layer steel cylinder 1 and outer steel cylinder 2, described enhancing structure 3 is specially and is wound around the steel band that internal layer steel cylinder 1 is outer and be welded and fixed with internal layer steel cylinder 1 and outer steel cylinder 2, described internal layer concrete layer 6 is located at internal layer steel cylinder 1 inside, described outer concrete layer 5 is located at outer steel cylinder 2 outsides, in the space of described Concrete Filled structure 4 between internal layer steel cylinder 1, outer steel cylinder 2 and enhancing structure 3; In described outer concrete layer 5, be also provided with sacrificial anode 7 and steel leg 8, described steel leg 8 is welded on outer steel cylinder 2 outer surfaces, described sacrificial anode 7 is connected with outer steel cylinder 2 by steel leg 8, described sacrificial anode 7 is arc, the outer surface of the outer surface of described sacrificial anode 7 and outer concrete layer 5 is in same curved surface, and described sacrificial anode 7 is provided with insulation coating 9 with the surface of contact of outer concrete layer 5.
The cathodic protection of steel push pipe is in the past carried out after jacking construction jacking puts in place, because steel push pipe outer wall does not have the carrying platform of sacrificial anode, if be welded on outside steel pipe, sacrificial anode can increase thrust force, and easily in jack-in process, comes off.The utility model is different from the cathodic protection mode of steel push pipe in the past, and sacrificial anode 7 is inlaid in outer concrete layer 5, in the time that push pipe is implemented, sacrificial anode 7 is together sent into specified position.
Preferably, described insulation coating 9 is specially non-solvent epoxy durable coating.Described non-solvent epoxy durable coating is that first component and second component evenly mix by weight the ratio that is 10:3, described first component is that epoxy resin, titanium dioxide, calcium silicate, silica, calcium oxide, six kinds of materials of liquid polysulphide rubber mix by weight the ratio of 8:2:2:3:2:3, and described second component is that Mannich amine, calcium silicate, silica, four kinds of materials of calcium oxide mix by weight the ratio of 3:1:1:1.The concrete component proportion of non-solvent epoxy durable coating is in table 1.
Described non-solvent epoxy durable coating can keep for a long time insulating properties under concrete environment, and be all combined fine with outer concrete layer 5 and sacrificial anode 7, can in prolonged application process, not there is not crackle in its combination interface place, cause the two unfavorable phenomenons in aspect, that crackle existence makes aggressive medium on the one hand, as penetrating into outer steel cylinder 2 surfaces, the aqueous solution etc. causes corrosion, on the other hand, sacrificial anode 7 materials dissolve in the interface contacting with outer concrete layer 5, the corrosion products that its process produces can damage because expand outer concrete layer 5, cause very large defect.Non-solvent epoxy durable coating characteristic is in table 2, this characteristic ensured long during one's term of military service in degree of aging very little, can meet the insulating properties of sacrificial anode 7 materials in outer concrete layer 5.
Table 1 non-solvent epoxy durable coating component proportion
Table 2 non-solvent epoxy durable coating characteristic
Preferably, described outer steel cylinder 2 is provided with multiple perforate 2a.Described perforate 2a makes the concrete of Concrete Filled structure 4 be connected with the concrete of outer concrete layer 5, and tie point plays anchorage effect to outer concrete layer 5, increases the adhesive strength of outer concrete layer 5 and outer steel cylinder 2.Referring to Fig. 7.
Preferably, described outer steel cylinder 2 outer surfaces are rough surface.Can, by outer steel cylinder 2 being carried out to sandblast hacking or making the modes such as male and fomale(M&F) in axial direction and make rough surface, increase the roughness of outer steel cylinder 2, effectively increase the combination force of the outer concrete layer 5 outside outer steel cylinder 2.Referring to Fig. 6.
Preferably, the quantity of described steel band is for being more than or equal to 1.In the time that the quantity of steel band is 1, described steel band at least completes a circumference and is wound around; In the time that the quantity of steel band is many, described steel band is evenly arranged along internal layer steel cylinder 1.The quantity of steel band, along heavy caliber give, drainage pipe diameter to height depend on design strength, fabricating cost.Increasing steel band height can effectively increase and be subject to force intensity, needs to increase cost simultaneously.
Preferably, the spiral angle of described steel band and internal layer steel cylinder 1 is 5 °～90 °.Described spiral angle is welding line and this angle at internal layer steel cylinder 1 radial plane internal tangent of steel band on internal layer steel cylinder 1.As internal layer steel cylinder 1 is launched, for welding line and angle theta radially, referring to accompanying drawing 4 and accompanying drawing 5.In the time that spiral angle is 90 °, steel band is along the 1 axial direction welding of internal layer steel cylinder.
Preferably, the cross section of described steel band is specially rectangular, trapezoidal, waveform, U-shaped or V-arrangement.Make tubing there is excellent hoop rigidity and intensity.
Preferably, described steel band along heavy caliber give, drainage pipe diameter to height be 20mm～150mm.In meeting rigidity and hardness, save raw material, reduce weight simultaneously.
Described Concrete Filled structure 4 is self-compact concrete more than C40.Self-compact concrete is the one of high performance concrete, and its topmost character is under deadweight, need not vibrate, and the space in filling template voluntarily, forms closely knit concrete structure.In addition it also has good mechanical property and endurance quality, this is a kind ofly to start until the high performance concrete all considered of the spreadable life hardening comprehensively from concrete mix, its superiority is mainly manifested in: improve concrete density and durability, avoid Lou shaking, cross the personal factor in the construction such as shake and arrangement of reinforcement is intensive, structure forms the impacts of adverse condition on construction quality such as complexity; Reduce operation intensity, save labour, facility and power consumption vibrate; Can eliminate the noise that vibrates, improve environment, alleviate the contradiction that construction disturbs residents; Simplify working process, the reduction of erection time, raise the efficiency.
Self-compact concrete, according to the code requirement of relevant self-compact concrete preparation and construction, adopt slump 250mm, divergence 600mm, the poor 25mm in middle limit, flows down time 6-16S, and four indices is feasible, there are good cohesive quality, mobility and water retention, make concrete self-compacting.
The utlity model has following useful effect:
Heavy caliber with sacrificial anode described in the utility model is given, waste pipe push pipe, and anti-corrosion effects is good, durable in use, and working process is simple, reduces weight and cost of production in meeting Rigidity and strength, has larger society and economic value.
Brief description of the drawings
Fig. 1 is the utility model embodiment's structural representation;
Fig. 2 is the sectional view of the utility model embodiment sacrificial anode arrangement;
Fig. 3 is the plan view of the utility model embodiment sacrificial anode arrangement;
Fig. 4 is the combination schematic diagram of the utility model embodiment internal layer steel cylinder and steel band;
Fig. 5 is the welding line of the utility model embodiment steel band on internal layer steel cylinder and angle schematic diagram radially;
Fig. 6 is the rough schematic surface of the outer steel cylinder of the utility model embodiment;
Fig. 7 is the schematic diagram with perforate on the outer steel cylinder of the utility model embodiment;
Fig. 8 is the schematic diagram of the utility model embodiment push pipe joint processing mode;
In figure: 1, internal layer steel cylinder; 2, outer steel cylinder; 3, strengthen structure; 4, Concrete Filled structure; 5, outer concrete layer; 6, internal layer concrete layer; 7, sacrificial anode; 8, steel leg; 9, insulation coating; 10, joint; 11, interface; 11a, the free part of interface; 11b, joint weld part; 12, joint socket; 13, hole for injecting glue; 14, sealer.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in detail.
Embodiment 1
As shown in Fig. 1-8, a kind of heavy caliber with sacrificial anode is given, waste pipe push pipe, and described heavy caliber is given, waste pipe push pipe comprises internal layer steel cylinder 1, outer steel cylinder 2, strengthen structure 3, Concrete Filled structure 4, outer concrete layer 5, internal layer concrete layer 6; Described enhancing structure 3 is located between internal layer steel cylinder 1 and outer steel cylinder 2, described enhancing structure 3 is specially and is wound around the steel band that internal layer steel cylinder 1 is outer and be welded and fixed with internal layer steel cylinder 1 and outer steel cylinder 2, described internal layer concrete layer 6 is located at internal layer steel cylinder 1 inside, described outer concrete layer 5 is located at outer steel cylinder 2 outsides, in the space of described Concrete Filled structure 4 between internal layer steel cylinder 1, outer steel cylinder 2 and enhancing structure 3; In described outer concrete layer 5, be also provided with sacrificial anode 7 and steel leg 8, described steel leg 8 is welded on outer steel cylinder 2 outer surfaces, described sacrificial anode 7 is connected with outer steel cylinder 2 by steel leg 8, described sacrificial anode 7 is arc, the outer surface of the outer surface of described sacrificial anode 7 and outer concrete layer 5 is in same curved surface, and described sacrificial anode 7 is provided with insulation coating 9 with the surface of contact of outer concrete layer 5.
The cathodic protection of steel push pipe is in the past carried out after jacking construction jacking puts in place, because steel push pipe outer wall does not have the carrying platform of sacrificial anode, if be welded on outside steel pipe, sacrificial anode can increase thrust force, and easily in jack-in process, comes off.The utility model is different from the cathodic protection mode of steel push pipe in the past, and sacrificial anode 7 is inlaid in outer concrete layer 5, in the time that push pipe is implemented, sacrificial anode 7 is together sent into specified position.
Described outer steel cylinder 2 is provided with multiple perforate 2a.Described perforate 2a makes the concrete of Concrete Filled structure 4 be connected with the concrete of outer concrete layer 5, and tie point plays anchorage effect to outer concrete layer 5, increases the adhesive strength of outer concrete layer 5 and outer steel cylinder 2.Referring to Fig. 7.
Described outer steel cylinder 2 outer surfaces are rough surface.Can, by outer steel cylinder 2 being carried out to sandblast hacking or making the modes such as male and fomale(M&F) in axial direction and make rough surface, increase the roughness of outer steel cylinder 2, effectively increase the combination force of the outer concrete layer 5 outside outer steel cylinder 2.Referring to Fig. 6.
The quantity of described steel band is for being more than or equal to 1.In the time that the quantity of steel band is 1, described steel band at least completes a circumference and is wound around; In the time that the quantity of steel band is many, described steel band is evenly arranged along internal layer steel cylinder 1.The quantity of steel band, along heavy caliber give, drainage pipe diameter to height depend on design strength, fabricating cost.Increasing steel band height can effectively increase and be subject to force intensity, needs to increase cost simultaneously.
The spiral angle of described steel band and internal layer steel cylinder 1 is 5 °～90 °.Described spiral angle is welding line and this angle at internal layer steel cylinder 1 radial plane internal tangent of steel band on internal layer steel cylinder 1.As internal layer steel cylinder 1 is launched, for welding line and angle theta radially, referring to accompanying drawing 4 and accompanying drawing 5.In the time that spiral angle is 90 °, steel band is along the 1 axial direction welding of internal layer steel cylinder.
The cross section of described steel band is specially rectangular, trapezoidal, waveform, U-shaped or V-arrangement.Make tubing there is excellent hoop rigidity and intensity.
Described steel band along heavy caliber give, drainage pipe diameter to height be 20mm～150mm.In meeting rigidity and hardness, save raw material, reduce weight simultaneously.
Described Concrete Filled structure 4 is self-compact concrete more than C40.Self-compact concrete is the one of high performance concrete, and its topmost character is under deadweight, need not vibrate, and the space in filling template voluntarily, forms closely knit concrete structure.In addition it also has good mechanical property and endurance quality, this is a kind ofly to start until the high performance concrete all considered of the spreadable life hardening comprehensively from concrete mix, its superiority is mainly manifested in: improve concrete density and durability, avoid Lou shaking, cross the personal factor in the construction such as shake and arrangement of reinforcement is intensive, structure forms the impacts of adverse condition on construction quality such as complexity; Reduce operation intensity, save labour, facility and power consumption vibrate; Can eliminate the noise that vibrates, improve environment, alleviate the contradiction that construction disturbs residents; Simplify working process, the reduction of erection time, raise the efficiency.
Self-compact concrete, according to the code requirement of relevant self-compact concrete preparation and construction, adopt slump 250mm, divergence 600mm, the poor 25mm in middle limit, flows down time 6-16S, and four indices is feasible, there are good cohesive quality, mobility and water retention, make concrete self-compacting.
Embodiment 2
Working process:
(1) steel cylinder moulding
First make internal layer steel cylinder 1, adopt spiral steel cylinder coil welding machine to be welded internal layer steel cylinder 1, in the time of welding internal layer steel cylinder 1, along internal layer steel cylinder 1 weld joint spiral welded steel band, steel band is evenly arranged along internal layer steel cylinder 1, and steel band quantity can be controlled between 1-15 bar, in the time that the quantity of steel band is 1, steel band at least completes a circumference and is wound around, and ribbon spiral angle is controlled between 5 °～90 °.While adopting spiral welded, calculate internal layer steel cylinder 1 spiral girth (each pitch) to guarantee welding quality and economic materials according to internal layer steel cylinder 1 diameter, ribbon spiral angle, steel band used steel band seam width wide and required overlap joint.
(2) weld outer steel cylinder
Be welded outer steel cylinder 2 along steel band outer, adopt spiral steel cylinder coil welding machine to be welded outer steel cylinder 2, inside and outside steel cylinder 1 forms a double-deck steel cylinder of entirety by steel band.
(3) installation of sacrifice anode
The installation of sacrificial anode 7 is to be welded on outer steel cylinder 2 outer wall specified positiones before perfusion outer concrete layer 5 concrete, loads onto after outer concrete layer 5 mould, and sacrificial anode 7 outer surfaces and mold inside are nearer.Before this pipe is headed into, the concrete of sacrificial anode 7 outer surfaces is polished off, this layer concrete is very thin conventionally, ensures to expose smooth finish surface, works in order to sacrificial anode 7.
(3) filling concrete
In order to ensure concrete smooth perfusion and fully closely knit, adopt self-compact concrete more than C40, disposable form outer concrete layer 5, internal layer concrete layer 6, Concrete Filled structure 4 from top to bottom.
Embodiment 3
The selection of sacrificial anode and arrangement:
The size of sacrificial anode 7 is relevant with the protection time limit, the size of protected pipe and the material of employing.Four angles place of sacrificial anode 7 is provided with steel leg 8, and steel leg 8 adopts and internal layer steel cylinder 1, material that outer steel cylinder 2 is identical.The pin of steel leg 8 is welded on the position near joint 10 on outer steel cylinder 2 after outer steel cylinder 2 moulding, and sacrificial anode 7 is arranged near interface tube 11 places, and concrete structure is shown in Fig. 2 and Fig. 3.Because 7 of sacrificial anodes that are arranged on outer steel cylinder 2 outer walls are responsible for protecting the pipeline that is mounted sacrificial anode 7, sacrificial anode 7 consumptions are less, and size is also less.As 3 meters of nominal diameters, the pipeline of long 4 meters, the sacrificial anode 7 needing is the zinc anode of 2 centimetres of 1 meter of arc length, axial 0.45 meter, thickness, or the magnesium alloy anode of 2 centimetres of 1 meter of arc length, axial 0.25 meter, thickness.Sacrificial anode 7 sizes are little, all can not bring large impact to concrete integral structure and jacking etc.Except the outer surface of sacrificial anode 7, its lap all adopts insulation coating insulation.Making so to be only exposed to soil middle-jiao yang, function of the spleen and stomach pole-face can work, and after having avoided like this sacrificial anode 7 and outer concrete layer 5 concrete surface to corrode, producing corrosion products can expansion damage outer concrete layer 5 concrete integrity.Meanwhile, the steel leg of sacrificial anode 78 and welding foot are also applied to insulation coating.Sacrificial anode 7 is welded on outer steel cylinder 2 in advance, and after packing in mould, cast concrete forms outer concrete layer 5.
Embodiment 4
The processing mode of push pipe joint:
The utility model has also carried out new design to push pipe joint 10, sees Fig. 8.Because pipe main body has adopted bitubular steel cylinder, the interface of the utility model push pipe adopts rigid interface 11 (steel loop), and steel ring welding, on outer steel cylinder 2, is adopted to two weld seams.The free part 11a of interface 11, higher than interface 11 welding portion 11b, ensures that space socket joint puts in place like this.In a side of the joint socket 12 not welding, leave in advance the hole for injecting glue 13 for sealing.After joint socket 12 is in place, from managing interior employing high-pressure injection plastic equipment, sealer 14 is injected in joint socket 12.Sealer 14 can be selected the solid types such as Thiokol, and solidifying within the time of construction requirement confirms to meet seal request after bulge test.For joint socket 12, anticorrosion very crucial, may be the key area of corrosion here.Therefore, welding after joint socket 12, using heavy corrosion coating, as non-solvent epoxy etc. carries out anti-corrosion protection to joint socket 12, especially butt welded seam place, should strengthen preservative treatment.After joint socket 12 is in place, check the anticorrosion situation of joint socket 12, if met the demands, outside joint socket 12, carry out concrete and be coated, when coated concrete, need to adopt outer band.
Embodiment 5
Below taking the heavy caliber of following size give, waste pipe is as example, contrasts weight and the cost of production of different pipelines:
Heavy caliber is given, waste pipe is of a size of: heavy caliber is given, waste pipe pipe inner diameter is 3000mm, and pipe axial length is 4000mm, and pipe thickness is 224mm;
Wherein: the steel plate thickness of internal layer steel cylinder 1 and outer steel cylinder 2 is 2mm; The thickness of internal layer concrete layer 6 and outer concrete layer 5 is 50mm; Steel band along heavy caliber give, drainage pipe diameter to height be 120mm, the thickness of Concrete Filled structure 4 is 120mm.
The number of steel band is 10, is evenly arranged along internal layer steel cylinder 1, and spiral angle is 30 °,
Taking double-layer wire PCCP as unit weight, the PCCP pipe of weight of the present utility model and double-layer wire approaches, and higher than individual layer steel wire, PCCP manages approximately 3%.The concrete reinforced pipe of using far below jacking, weight declines approximately 30%, and this can reduce transport and construction cost for jacking construction.
According to the market price of the fourth quater in 2013, comprise processing cost, the price of steel pipe, far above steel and concrete structure pipe, doubles above.And in steel and concrete structure pipe, the reinforced concrete cost of pipe jacking method is the highest, as adopted the utility model structure, cost 25% left and right that will decline.In addition, the utility model cost is managed low 7% left and right compared with double-layer wire PCCP, manages high 9% left and right than individual layer steel wire PCCP.
Embodiment 6
Heavy caliber is given, waste pipe model test is calculated:
Through the calculating of finite element software, no matter this pipeline configuration is all in a safe condition under Construction State or under normal operating condition, and have larger safety coefficient.Preliminary proof rationality and the feasibility of this project organization.But because there is the problem such as model simplification and calculus of approximation in the numerical simulation of finite element software, may also can there is different with the working condition of under ground piping reality, in order further to verify the rationality of designed underground pipeline structures, to its carry out laboratory experiment.
According to the principle of similitude of model test (comprise that geometric similarity, quality are similar, physical similarity, load similar), formulate following test model.
Key dimension has:
(1) heavy caliber is given, waste pipe pipe inner diameter is 362mm, and pipe axial length is 700mm, and pipe thickness is 94mm, pipe outer diameter 550mm;
(2) steel band height is 30mm, and thickness of strips is 2mm, and steel band quantity is 2, and spiral angle is 30 °;
(3) outer steel cylinder 2 steel plate thickness are 2mm, and internal layer steel cylinder 1 steel plate thickness is 2mm;
(4) outer concrete layer 5 thickness are 30mm, and internal layer concrete layer 6 thickness are 30mm, and Concrete Filled structure 4 thickness are 30mm.
Main material has:
(1) steel band, outer steel cylinder 2, internal layer steel cylinder 1 adopt Q235 hot rolled steel sheet;
(2) outer concrete layer 5, internal layer concrete layer 6, Concrete Filled structure 4 adopt self-compact concrete more than C40.
Uniaxial compression test is the extreme stressing conditions of simulation pipeline jacking construction, namely least favorable stressing conditions.From uniaxial compression test, it is 2700KN-2800KN that test specimen axially allows maximum top power.
Radial compression test is at radially worst stressing conditions, because now pipe waist place can exist larger tensile stress, thereby destroys pipeline.And in actual pipeline military service process, make pipeline can bear larger pressure stress thereby this place has the pressure stress of environment.Test from radial compression, it is 400KN that test specimen radially allows pressure maximum, and this value also can meet the radial pressure requirement that pipeline is on active service.
Below the present embodiment heavy caliber is given, waste pipe model with adopting, commercial reinforced concrete push pipe carries out maximum top force rate,
In " Water and Waste Water Engineering pipe-jacking technology code ", according to concrete reinforced pipe ultimate limit states computational rules, pipeline allows maximum top power formula to be
In formula: F
dc-concrete duct allows top power design load.
φ
1-concrete material compressive strength reduction coefficient, desirable 0.90.
φ
2-eccentric compression intensity improves coefficient, desirable 1.05.
φ
3-material fragility coefficient, desirable 0.85.
φ
5-concrete strength standard is adjusted coefficient, desirable 0.79.
F
c-concrete compression Intensity Design value.
A
pthe minimum effective force area of-pipeline.
γ
qd-top power partial safety factor, desirable 1.3.
Calculate concrete duct under line size, concrete strength same case and allow top power design load.Here concrete compression Intensity Design value is taken as 40KN/m
2, the minimum effective force area A of pipeline
p=1/4 π [550
2-362
2]=1.346 × 10
5mm
2.
Concrete duct allows top power design load F
dcfor 2105.5KN.
Contrast learns, under measure-alike, concrete strength same case, the present embodiment heavy caliber is given, waste pipe model allows top power design load to allow the high 28.2%-32.9% of top power design load than concrete duct.
Embodiment 7
The selection of insulation coating 9:
Described insulation coating 9 is specially non-solvent epoxy durable coating.Described non-solvent epoxy durable coating is that first component and second component evenly mix by weight the ratio that is 10:3, described first component is that epoxy resin, titanium dioxide, calcium silicate, silica, calcium oxide, six kinds of materials of liquid polysulphide rubber mix by weight the ratio of 8:2:2:3:2:3, and described second component is that Mannich amine, calcium silicate, silica, four kinds of materials of calcium oxide mix by weight the ratio of 3:1:1:1.The concrete component proportion of non-solvent epoxy durable coating is in table 1.
Described non-solvent epoxy durable coating can keep for a long time insulating properties under concrete environment, and be all combined fine with outer concrete layer 5 and sacrificial anode 7, can in prolonged application process, not there is not crackle in its combination interface place, cause the two unfavorable phenomenons in aspect, that crackle existence makes aggressive medium on the one hand, as penetrating into outer steel cylinder 2 surfaces, the aqueous solution etc. causes corrosion, on the other hand, sacrificial anode 7 materials dissolve in the interface contacting with outer concrete layer 5, the corrosion products that its process produces can damage because expand outer concrete layer 5, cause very large defect.Non-solvent epoxy durable coating characteristic is in table 2, this characteristic ensured long during one's term of military service in degree of aging very little, can meet the insulating properties of sacrificial anode 7 materials in outer concrete layer 5.
Table 1 non-solvent epoxy durable coating component proportion
Table 2 non-solvent epoxy durable coating characteristic
Above-described embodiment is only explanation technical conceive of the present utility model and feature, and its object is to allow person skilled in the art can understand content of the present utility model and implement according to this, can not limit protection domain of the present utility model with this.All equivalences of doing according to the utility model Spirit Essence change or modify, within all should being encompassed in protection domain of the present utility model.
Claims (9)
- With the heavy caliber of sacrificial anode give, a waste pipe push pipe, it is characterized in that: described heavy caliber comprises internal layer steel cylinder (1), outer steel cylinder (2), strengthens structure (3), Concrete Filled structure (4), outer concrete layer (5), internal layer concrete layer (6) to, waste pipe push pipe; Described enhancing structure (3) is located between internal layer steel cylinder (1) and outer steel cylinder (2), described enhancing structure (3) is specially and is wound around the steel band that internal layer steel cylinder (1) is outer and be welded and fixed with internal layer steel cylinder (1) and outer steel cylinder (2), described internal layer concrete layer (6) is located at internal layer steel cylinder (1) inside, described outer concrete layer (5) is located at outer steel cylinder (2) outside, and described Concrete Filled structure (4) is arranged in internal layer steel cylinder (1), outer steel cylinder (2) and strengthens the space between structure (3); In described outer concrete layer (5), be also provided with sacrificial anode (7) and steel leg (8), described steel leg (8) is welded on outer steel cylinder (2) outer surface, described sacrificial anode (7) is connected with outer steel cylinder (2) by steel leg (8), described sacrificial anode (7) is arc, the outer surface of the outer surface of described sacrificial anode (7) and outer concrete layer (5) is in same curved surface, and described sacrificial anode (7) is provided with insulation coating (9) with the surface of contact of outer concrete layer (5).
- According to a kind of heavy caliber claimed in claim 1 give, waste pipe, it is characterized in that: described insulation coating (9) is specially non-solvent epoxy durable coating.
- According to a kind of heavy caliber claimed in claim 1 give, waste pipe, it is characterized in that: described outer steel cylinder (2) is provided with multiple perforates (2a).
- According to a kind of heavy caliber claimed in claim 1 give, waste pipe, it is characterized in that: described outer steel cylinder (2) outer surface is rough surface.
- According to a kind of heavy caliber claimed in claim 3 give, waste pipe, it is characterized in that: described outer steel cylinder (2) outer surface is rough surface.
- According to the arbitrary described a kind of heavy caliber of claim 1-5 give, waste pipe, it is characterized in that: the quantity of described steel band is for being more than or equal to 1.
- According to a kind of heavy caliber claimed in claim 6 give, waste pipe, it is characterized in that: the spiral angle of described steel band and internal layer steel cylinder (1) is 5 °～90 °.
- According to a kind of heavy caliber claimed in claim 7 give, waste pipe, it is characterized in that: the cross section of described steel band is specially rectangular, trapezoidal, waveform, U-shaped or V-arrangement.
- According to a kind of heavy caliber claimed in claim 8 give, waste pipe, it is characterized in that: described steel band along heavy caliber give, drainage pipe diameter to height be 20mm～150mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089108A (en) * | 2014-06-13 | 2014-10-08 | 中国科学院金属研究所 | Large-diameter feeding and drainage pipe jacking pipe provided with sacrificial anode |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089108A (en) * | 2014-06-13 | 2014-10-08 | 中国科学院金属研究所 | Large-diameter feeding and drainage pipe jacking pipe provided with sacrificial anode |
| CN104089108B (en) * | 2014-06-13 | 2016-04-27 | 中国科学院金属研究所 | A kind of heavy caliber with sacrificial anode is given, waste pipe push pipe |
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