CN204962071U - Embed -type prestressing force steel cylinder concrete pipe of complete anticorrosive straight drinking water - Google Patents
Embed -type prestressing force steel cylinder concrete pipe of complete anticorrosive straight drinking water Download PDFInfo
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- CN204962071U CN204962071U CN201520732943.3U CN201520732943U CN204962071U CN 204962071 U CN204962071 U CN 204962071U CN 201520732943 U CN201520732943 U CN 201520732943U CN 204962071 U CN204962071 U CN 204962071U
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Abstract
The utility model discloses an embed -type prestressing force steel cylinder concrete pipe of complete anticorrosive straight drinking water, including cylinder part to and set up in the bellmouth steel loop and the socket steel loop at cylinder part both ends, cylinder part is stainless steel steel cylinder, steel cylinder inner wall concrete layer, steel cylinder, steel cylinder outer wall concrete layer and steel cylinder outer wall coating mortar by interior outside to in proper order, and the winding has a prestressed wire on steel cylinder outer wall concrete layer's the surface, be equipped with zinc -aluminium rare earth coating on the internal surface of socket steel loop and the surface of bellmouth steel loop respectively, be equipped with epoxy coal tar pitch coating on the steel cylinder outer wall coating mortar surface, it has modified polypropylene fiber all to mix among steel cylinder inner wall concrete layer, steel cylinder outer wall concrete layer and the steel cylinder outer wall coating mortar, the modified polypropylene fiber addition is 0.8-1Kgm3. This cement pipe simple structure, it is corrosion -resistant, can effectively prolong prestressing force steel cylinder cement pipe's life.
Description
Technical field
The utility model relates to a kind of prestressed concrete member, especially a kind of bellmouth steel loop of Prestressed concrete cylinder pipe two ends and socket steel ring are with thermal spraying zinc-aluminium rare earth coating, inner-walls of duct inner liner stainless steel steel cylinder, concrete pipe outer surface is with the embed-type Prestressed concrete cylinder pipe that can be used for direct drinking conveying of epoxy coal tar pitch coating simultaneously.
Background technique
At present, Prestressed concrete cylinder pipe (being called for short PCCP) is a kind of novel rigid pressure tubing.It is the strong concrete tube core winding reinforcement wire with steel cylinder; spray is with cement mortar protective course; adopt steel bell and spigot steel loop and be welded into one with steel cylinder; the fluted O-ring seal of joint socket band defines the flexible joint of sliding type cushion rubber; be the composite structure of steel plate, concrete, High Tensile Steel Wire and slush different materials composition, there is steel and concrete characteristic separately.Prestressed concrete cylinder pipe has and bears the characteristics such as interior external pressure is high, joint tighness good, shock resistance is strong, it is convenient and swift to execute, antiseptic property good, easy to maintenance, pay close attention to by engineering circles, be mainly used in long distance water transfer main line, pressure inverted-siphon, town water supply engineering, pressure water conveyer pipeline, electric power plant circulating water engineering pipeline, pressure blowdown main etc.Compared with tubing in the past, advantages such as having applied widely, the economic life is long, anti-seismic performance good, easy for installation, to run expenditure low, substantially water-tight.Prestressed concrete cylinder pipe can be divided into two kinds from structural type: a kind of is lined Prestressed concrete cylinder pipe (PCCPL), namely at steel cylinder inwall formation of concrete, directly ring orientation prestress steel wire is wound around, then gunite protective layer and the pipeline made outside steel cylinder; One is embed-type Prestressed concrete cylinder pipe (PCCPE), is to be embedded in by steel cylinder inside tube core concrete, in tube core outer walls of concrete, be then wound around gunite protective layer after ring orientation prestress steel wire.
But as the concrete member product be embedded in edatope, in edatope, if Prestressed concrete cylinder pipe does not take effective protective measure, along with the prolongation of service time, mortar cover in corrosive medium intrusion Prestressed concrete cylinder pipe in the edatope of Prestressed concrete cylinder pipe outer wall and in pipe in aqueous medium and concrete layer, arrive steel wire and steel cylinder surface, so will there is electrochemical corrosion in steel wire and steel cylinder, and then the corrosion failure of steel wire and steel cylinder can be caused, there is perforation and reveal even booster phenomenon, can cause a hidden trouble to the safe operation of pipe-line system, the operational reliability of direct threat tube system, wherein the etching problem of reinforcement wire and steel cylinder is the principal element affecting structure durability, if there is breakage because of corrosion in steel wire and steel cylinder, directly will cause the corrosion failure of Prestressed concrete cylinder pipe, thus affect the safe operation of whole pipe-line system.Adopt anti-corrosion measure very necessary to Prestressed concrete cylinder pipe as can be seen here, the joint socket steel loop of prestressed concrete pipe is directly outside exposed simultaneously, there is no the protection of concrete layer, as the joint of two prestressed concrete pipes, the surface protection of the bellmouth steel loop of prestressed concrete pipe and the socket steel ring of prestressed concrete pipe is particularly important, the operational reliability of this direct threat tube system, thus affect the safe operation of whole pipe-line system, therefore the outer surface of Prestressed concrete cylinder pipe and the bellmouth steel loop at two ends and socket steel ring process for treating surface are extremely necessary.
Especially at present country proposes the concept of direct drinking, and direct drinking refers to that user terminal directly exports the potable water meeting NBS.Direct drinking water project is domestic not universal at present, and be detected in the location pilot in small part city, associated conduit, the auxiliary facility in most domestic city are not also transformed completely, can not reach the standard that the water quality after registering one's residence also reaches direct drinking.As the important link in direct drinking water project, the direct drinking after purification carries common practice both domestic and external to be all adopt stainless steel pipeline.The outstanding anti-corrosion capacity of stainless steel pipeline, make stainless steel pipeline can the water quality safety of effective guarantee direct drinking, but Stainless Steel Tube relative to common steel tube and concrete pipe cost higher, if adopt common steel tube in direct drinking water project, steel pipe inner wall contacts the water quality safety that the corrosion products entail dangers to produced carries water with water, and adopt its effect of concrete pipe poorer, because the concrete layer of concrete pipe internal layer, due to water long-time stop in the duct with wash away, some materials inside concrete layer can be made to enter in water, have influence on water quality safety.Therefore Prestressed concrete cylinder pipe as direct drinking by pipe belt for Stainless Steel Tube, to inwall and the outer surface of Prestressed concrete cylinder pipe, and the bellmouth steel loop at two ends and socket steel ring process for treating surface are extremely necessary.
Model utility content
The purpose of this utility model is the technological deficiency that can not reach the requirement of direct drinking water project for overcoming above-mentioned existing cylinder concrete pipe, a kind of embed-type Prestressed concrete cylinder pipe of full anticorrosive direct drinking-water is provided, this concrete pipe structure is simple, corrosion-resistant, effectively can extend the working life of Prestressed concrete cylinder pipe, achieve cost-saving while, the object of water quality safety can also be ensured, avoid employing common steel tube, steel pipe inner wall contacts the water quality safety that the corrosion products entail dangers to produced carries water with water, adopt concrete pipe, some materials inside concrete layer are made to enter in water, have influence on the problem of water quality safety.
For achieving the above object, the utility model adopts following technical proposals:
A kind of embed-type Prestressed concrete cylinder pipe of full anticorrosive direct drinking-water, comprise shell portion, and be arranged at bellmouth steel loop and the socket steel ring at shell portion two ends, shell portion is followed successively by stainless steel steel cylinder, steel cylinder internal-wall concrete layer, steel cylinder, steel cylinder outer wall concrete layer and steel cylinder outer wall cement mortar protective course from inside to outside, the outer surface of steel cylinder outer wall concrete layer is wound with reinforcement wire, the internal surface of described socket steel ring and the outer surface of bellmouth steel loop are respectively equipped with zinc-aluminium rare earth coating; Described steel cylinder outer wall cement mortar protective course outer surface is provided with epoxy coal tar pitch coating; All modified polypropylene fiber is mixed with in described steel cylinder internal-wall concrete layer, steel cylinder outer wall concrete layer and steel cylinder outer wall cement mortar protective course.
Described modified polypropylene fiber adding quantity is 0.8 ~ 1Kg/m
3.
Internal-wall concrete layer is filled, the embedded stainless-steel pipe of internal-wall concrete layer in the weld part of stainless steel steel cylinder and steel cylinder and bellmouth steel loop.Inner liner stainless steel pipe in traditional concrete pipe; the cost being used alone Stainless Steel Tube can be reduced on the one hand; lose from the angle of multi-layer anticorrosion on the other hand; because the concrete pipe outside Stainless Steel Tube is cylinder concrete pipe; there is concrete, steel cylinder, steel wire, cement mortar protective course multi-layer anticorrosion compression-resistant structure feature; if the cylinder concrete pipe of inner liner stainless steel pipe is applied to direct drinking water project; have applied widely undoubtedly, the economic life be long, anti-seismic performance good, easy for installation, ensure the direct drinking advantage such as safely.
The outer wall of bellmouth steel loop and stainless-steel pipe is all connected with the fin extended vertically.Contact with the outer wall of bellmouth steel loop and stainless-steel pipe anti-be not cement mortar protective course and concrete layer; at all affixed fin extended vertically of outer wall of bellmouth steel loop and stainless-steel pipe; can vertical die build shaping after, make bellmouth steel loop and cement mortar protective course, Stainless Steel Tube and concrete layer have better fixing and combination.Extend the working life of cylinder concrete pipe greatly.
Bellmouth steel loop and fin and stainless-steel pipe and fin are integral type structure.When producing bellmouth steel loop and the stainless-steel pipe of band fin, can adopt the production technology of molding and forming, technique is simple, and cost is lower, and greatly improves.
Zinc-aluminium rare earth is existing product, all can buy in the market, does not repeat them here its component.Zinc-aluminium rare earth coating adopts electric arc spraying obtained on finished product concrete pipe exposed bellmouth steel loop inwall and socket steel ring outer wall.In Aluminum Coating, Zn-ef ficiency act as antisepsis, aluminium element plays skeletal support effect in the coating, better formation anticorrosive coat, adding of the rare earth elementss such as a small amount of La and Ce in addition, can allow in the spraying process of electric arc spraying and more be atomized particle size, thus improve the even compact of coating, serve better antiseptic effect equally.
The temperature of electric arc spraying is very high, two kinds of B alloy wires are that the state of melting and dispersion sprays to pipe surface fast, high-temperature fusion Zn alloy and AlRE alloy quench solidification form Zn phase and AlRE alloy phase, only have Zn phase and AlRE alloy phase two kinds of Solidification Structure near interfaces just by diffuseing to form some Zn-Al-RE solid solution alloies, or some are mingled with the solid solution alloy of Zn alloy and AlRE alloy.
This tissue signature of Zn-Al-RE alloy-layer creates favorable influence to its corrosion resisting property to a certain extent, because Zn phase and AlRE alloy phase alternately exist, work in coordination with and played the sacrificing protection effect of Zn alloy phase and the passivation protection effect of AlRE alloy phase, netted hard framework is formed between the AlRE alloy phase in alloy-layer, not only play the effect stoping Zn corrosion, and AlRE alloy generates fine and close corrosion products in corrosion process, this corrosion products to Chlorine in Solution ion internally scattering and permeating serve barrier effect, thus show significantly " self-enclosed " effect.Therefore, the infiltration of aggressive medium can be reduced.
The corrosion resistance of Zn-Al-RE alloy is better than ZnAl alloy and ZnAl alloy, and this is because RE element can refinement coating granule, makes grain graininess even, reduces coating porosity, makes coating structure fine and close, and then decreases etching channels.Therefore after certain hour is carried out in corrosion reaction, due to the blocking of passivating film and corrosion products, aggressive medium is difficult to enter by the defect of coating surface the interface that coating arrives coating/matrix, the self-enclosed effect of coating is more obvious, increase substantially the stability of coating corrosion product layer, thus made ZnAlRE alloy-layer show better corrosion resistance.Adding of RE element is reduction of the porosity ratio of coating to the main cause of corrosion resistance coating impact, serves the effect of purification and thinning microstructure, thus the surface activity point in coating corrosion process is reduced, thus show obvious and stable self-enclosed effect.Therefore, Zn-Al-RE alloy-layer has excellent corrosion resisting property.
Modified polypropylene fiber is existing product, can buy in market, does not repeat them here its specific product composition.Modified polypropylene fiber to be interweaved mutually webbed fiber through a branch of bundle that special processing and process are made by acrylic resin.It has extremely strong combination force with the base-material of cement concrete.Adding in concrete base-material, after stirring, because being subject to the impact of the aggregate such as cement, sandstone, automatically opening.Become monofilament one by one or involve mutually multidirectional distributed fibers, being formed at inside concrete a kind of disorderly to support system.Extremely effectively can control early stage plastic shrinkage and the sedimentation crackle of concrete and slush.Greatly improve concrete impervious, resistant to breakage, shock resistance, Concrete Structure toughness and wear resistance, thus the life-span of building is extended greatly, greatly reduce engineering maintenance expense.
Modified polypropylene fiber is that polypropylene fiber is by polypropylene and multiple organic and inorganic material, refine through special complex technique and form, product can form the netted support effect of three-dimensional random distribution in concrete, concrete is stopped at the microscopic crack that the sclerosis initial stage is formed in evolution, is difficult to further develop.Thus concrete fracture toughness can be improved, improving concrete anti-crack and anti-seepage performance, is mortar, concrete works cracking resistance, and antiseepage is wear-resisting, the new type ideal material of insulation.
Coating can as there being important defence line together, effective raising Prestressed concrete cylinder pipe corrosion resistance, greatly extend Prestressed concrete cylinder pipe original life-span, therefore Prestressed concrete cylinder pipe process for treating surface, especially cladding technique is extremely necessary.
The beneficial effects of the utility model are:
1, the bellmouth steel loop at the utility model Prestressed concrete cylinder pipe two ends and socket steel ring are with thermal spraying zinc-aluminium rare earth coating, and concrete pipe outer surface is with the embed-type Prestressed concrete cylinder pipe of epoxy coal tar pitch coating simultaneously.By adopting arc spray process obtained zinc-aluminium rare earth coating on bellmouth steel loop and the exposed surface of socket steel ring; epoxy coal tar pitch coating is directly coated with and is contained on cement mortar protective course; carry out two protection; for the antiseptic property raising of embed-type Prestressed concrete cylinder pipe adds the important barrier of twice, application is convenient.
2, innermost layer stainless steel steel cylinder of the present utility model is the direct drinking water project that embed-type Prestressed concrete cylinder pipe can be applied in water delivery engineering, effectively can suppress the stripping of material in concrete layer, for water delivery increases safely important barrier together, application is convenient.
3, the utility model overall structure is simple; design science is reasonable; there is good durability, corrosion resistance; and manufacturing process is simple; directly being coated with through the zinc-aluminium rare earth coating process of joint socket steel loop thermal spraying on surface and epoxy coal tar pitch coating the embed-type Prestressed concrete cylinder pipe life-span be contained on cement mortar protective course effectively to be extended, is the embed-type Prestressed concrete cylinder pipe that a kind of novelty is higher.
4, the utility model is the further technological improvement on the patent ZL201210220591.4 basis of claimant's earlier application; main improvement is that innermost layer arranges stainless steel steel cylinder, zinc-aluminium rare earth coating, in steel cylinder internal-wall concrete layer, steel cylinder outer wall concrete layer and steel cylinder outer wall cement mortar protective course, is all mixed with modified polypropylene fiber, and the technique effect of improvement has been told about clear above.The corresponding existing technology of the utility model, its overall technical architecture is that expense is apparent, and creates unforeseeable technique effect, has outstanding substantive distinguishing features and progress significantly.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation;
Wherein, 1-socket steel ring, 2-steel cylinder outer wall cement mortar protective course, 3-reinforcement wire, 4-steel cylinder, 5-steel cylinder outer wall concrete layer, 6-steel cylinder internal-wall concrete layer, 7-bellmouth steel loop, 8-zinc-aluminium rare earth coating, 9-epoxy coal tar pitch coating, 10-stainless steel steel cylinder.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
As shown in Figure 1, the embed-type Prestressed concrete cylinder pipe of full anticorrosive direct drinking-water, comprise shell portion, and be arranged at bellmouth steel loop 7 and the socket steel ring 1 at shell portion two ends, shell portion is followed successively by stainless steel steel cylinder 10, steel cylinder internal-wall concrete layer 6, steel cylinder 4, steel cylinder outer wall concrete layer 5 and steel cylinder outer wall cement mortar protective course 2 from inside to outside, the outer surface of steel cylinder outer wall concrete layer 5 is wound with reinforcement wire 3, the internal surface of described socket steel ring 1 and the outer surface of bellmouth steel loop 7 are respectively equipped with zinc-aluminium rare earth coating 8; Described steel cylinder outer wall cement mortar protective course 2 outer surface is provided with epoxy coal tar pitch coating 9; All modified polypropylene fiber is mixed with in described steel cylinder internal-wall concrete layer 6, steel cylinder outer wall concrete layer 5 and steel cylinder outer wall cement mortar protective course 2; Modified polypropylene fiber adding quantity is 0.8 ~ 1Kg/m
3.
Stainless steel steel cylinder 10 and steel cylinder 4 fill internal-wall concrete layer, the embedded stainless-steel pipe of internal-wall concrete layer with the weld part of bellmouth steel loop 7 is interior.Inner liner stainless steel pipe in traditional concrete pipe; the cost being used alone Stainless Steel Tube can be reduced on the one hand; lose from the angle of multi-layer anticorrosion on the other hand; because the concrete pipe outside Stainless Steel Tube is cylinder concrete pipe; there is concrete, steel cylinder, steel wire, cement mortar protective course multi-layer anticorrosion compression-resistant structure feature; if the cylinder concrete pipe of inner liner stainless steel pipe is applied to direct drinking water project; have applied widely undoubtedly, the economic life be long, anti-seismic performance good, easy for installation, ensure the direct drinking advantage such as safely.
The outer wall of bellmouth steel loop 7 and stainless-steel pipe 10 is all connected with the fin extended vertically.Contact with the outer wall of bellmouth steel loop and stainless-steel pipe anti-be not cement mortar protective course and concrete layer; at all affixed fin extended vertically of outer wall of bellmouth steel loop and stainless-steel pipe; can vertical die build shaping after, make bellmouth steel loop and cement mortar protective course, Stainless Steel Tube and concrete layer have better fixing and combination.Extend the working life of cylinder concrete pipe greatly.
Bellmouth steel loop and fin and stainless-steel pipe and fin are integral type structure.When producing bellmouth steel loop and the stainless-steel pipe of band fin, can adopt the production technology of molding and forming, technique is simple, and cost is lower, and greatly improves.
Zinc-aluminium rare earth coating adopts electric arc spraying obtained on finished product concrete pipe exposed bellmouth steel loop inwall and socket steel ring outer wall.In Aluminum Coating, Zn-ef ficiency act as antisepsis, aluminium element plays skeletal support effect in the coating, better formation anticorrosive coat, adding of the rare earth elementss such as a small amount of La and Ce in addition, can allow in the spraying process of electric arc spraying and more be atomized particle size, thus improve the even compact of coating, serve better antiseptic effect equally.
The temperature of electric arc spraying is very high, two kinds of B alloy wires are that the state of melting and dispersion sprays to pipe surface fast, high-temperature fusion Zn alloy and AlRE alloy quench solidification form Zn phase and AlRE alloy phase, only have Zn phase and AlRE alloy phase two kinds of Solidification Structure near interfaces just by diffuseing to form some Zn-Al-RE solid solution alloies, or some are mingled with the solid solution alloy of Zn alloy and AlRE alloy.
This tissue signature of Zn-Al-RE alloy-layer creates favorable influence to its corrosion resisting property to a certain extent, because Zn phase and AlRE alloy phase alternately exist, work in coordination with and played the sacrificing protection effect of Zn alloy phase and the passivation protection effect of AlRE alloy phase, netted hard framework is formed between the AlRE alloy phase in alloy-layer, not only play the effect stoping Zn corrosion, and AlRE alloy generates fine and close corrosion products in corrosion process, this corrosion products to Chlorine in Solution ion internally scattering and permeating serve barrier effect, thus show significantly " self-enclosed " effect.Therefore, the infiltration of aggressive medium can be reduced.
The corrosion resistance of Zn-Al-RE alloy is better than ZnAl alloy and ZnAl alloy, and this is because RE element can refinement coating granule, makes grain graininess even, reduces coating porosity, makes coating structure fine and close, and then decreases etching channels.Therefore after certain hour is carried out in corrosion reaction, due to the blocking of passivating film and corrosion products, aggressive medium is difficult to enter by the defect of coating surface the interface that coating arrives coating/matrix, the self-enclosed effect of coating is more obvious, increase substantially the stability of coating corrosion product layer, thus made ZnAlRE alloy-layer show better corrosion resistance.Adding of RE element is reduction of the porosity ratio of coating to the main cause of corrosion resistance coating impact, serves the effect of purification and thinning microstructure, thus the surface activity point in coating corrosion process is reduced, thus show obvious and stable self-enclosed effect.Therefore, Zn-Al-RE alloy-layer has excellent corrosion resisting property.
Modified polypropylene fiber is existing product, can buy in market, does not repeat them here its specific product composition.Modified polypropylene fiber to be interweaved mutually webbed fiber through a branch of bundle that special processing and process are made by acrylic resin.It has extremely strong combination force with the base-material of cement concrete.Adding in concrete base-material, after stirring, because being subject to the impact of the aggregate such as cement, sandstone, automatically opening.Become monofilament one by one or involve mutually multidirectional distributed fibers, being formed at inside concrete a kind of disorderly to support system.Extremely effectively can control early stage plastic shrinkage and the sedimentation crackle of concrete and slush.Greatly improve concrete impervious, resistant to breakage, shock resistance, Concrete Structure toughness and wear resistance, thus the life-span of building is extended greatly, greatly reduce engineering maintenance expense.
Modified polypropylene fiber is that polypropylene fiber is by polypropylene and multiple organic and inorganic material, refine through special complex technique and form, product can form the netted support effect of three-dimensional random distribution in concrete, concrete is stopped at the microscopic crack that the sclerosis initial stage is formed in evolution, is difficult to further develop.Thus concrete fracture toughness can be improved, improving concrete anti-crack and anti-seepage performance, is mortar, concrete works cracking resistance, and antiseepage is wear-resisting, the new type ideal material of insulation.
Coating can as there being important defence line together, effective raising Prestressed concrete cylinder pipe corrosion resistance, greatly extend Prestressed concrete cylinder pipe original life-span, therefore Prestressed concrete cylinder pipe process for treating surface, especially cladding technique is extremely necessary.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the restriction not to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection domain of the present utility model.
Claims (2)
1. the embed-type Prestressed concrete cylinder pipe of a full anticorrosive direct drinking-water, comprise shell portion, and be arranged at bellmouth steel loop and the socket steel ring at shell portion two ends, it is characterized in that, shell portion is followed successively by stainless steel steel cylinder, steel cylinder internal-wall concrete layer, steel cylinder, steel cylinder outer wall concrete layer and steel cylinder outer wall cement mortar protective course from inside to outside, the outer surface of steel cylinder outer wall concrete layer is wound with reinforcement wire, the internal surface of described socket steel ring and the outer surface of bellmouth steel loop are respectively equipped with zinc-aluminium rare earth coating; Described steel cylinder outer wall cement mortar protective course outer surface is provided with epoxy coal tar pitch coating; All modified polypropylene fiber is mixed with in described steel cylinder internal-wall concrete layer, steel cylinder outer wall concrete layer and steel cylinder outer wall cement mortar protective course.
2. the embed-type Prestressed concrete cylinder pipe of full anticorrosive direct drinking-water as claimed in claim 1, it is characterized in that, described modified polypropylene fiber adding quantity is 0.8 ~ 1Kg/m
3.
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| CN201520732943.3U CN204962071U (en) | 2015-09-22 | 2015-09-22 | Embed -type prestressing force steel cylinder concrete pipe of complete anticorrosive straight drinking water |
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| CN201520732943.3U CN204962071U (en) | 2015-09-22 | 2015-09-22 | Embed -type prestressing force steel cylinder concrete pipe of complete anticorrosive straight drinking water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105179821A (en) * | 2015-09-22 | 2015-12-23 | 山东龙泉管道工程股份有限公司 | Full-anti-corrosion embedded type prestress steel cylinder concrete pipe used for direct drinking water |
| CN115059807A (en) * | 2022-06-30 | 2022-09-16 | 安钢集团永通球墨铸铁管有限责任公司 | Short-length micro jacking pipe and manufacturing process thereof |
-
2015
- 2015-09-22 CN CN201520732943.3U patent/CN204962071U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105179821A (en) * | 2015-09-22 | 2015-12-23 | 山东龙泉管道工程股份有限公司 | Full-anti-corrosion embedded type prestress steel cylinder concrete pipe used for direct drinking water |
| CN115059807A (en) * | 2022-06-30 | 2022-09-16 | 安钢集团永通球墨铸铁管有限责任公司 | Short-length micro jacking pipe and manufacturing process thereof |
| CN115059807B (en) * | 2022-06-30 | 2024-02-13 | 安钢集团永通球墨铸铁管有限责任公司 | Short-length micro-jacking pipe and manufacturing process thereof |
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