CN102995026B - Construction method for cathode protection device for underground pipeline system - Google Patents
Construction method for cathode protection device for underground pipeline system Download PDFInfo
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- CN102995026B CN102995026B CN201210408715.1A CN201210408715A CN102995026B CN 102995026 B CN102995026 B CN 102995026B CN 201210408715 A CN201210408715 A CN 201210408715A CN 102995026 B CN102995026 B CN 102995026B
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Abstract
The invention discloses a construction method for a cathode protection device for an underground pipeline system. The construction method comprises the following steps of: 1, drilling downwards from the ground surface (101) above the outer part of an underground pipeline (1); 2, mounting a hollow external protection pipe (2) in a hole which is drilled in the step 1 to ensure that the front end of the external protection pipe (2) contacts the outer wall of the underground pipeline (1); 3, lowering down a waterproof sleeve (5), ensuring that a feed connector (402) which is fixedly arranged at the front end of the waterproof sleeve (5) closely contacts the outer wall of the underground pipeline (1) without moving, and welding; 4, welding the feed connector (402) which is fixedly arranged at the front end of the waterproof sleeve (5) and a metal part of the underground pipeline (1) together; and 5, constructing a sacrificial anode (7). The construction method is comprehensive in technology, has an obvious effect and is convenient to construct and operate. The invention relates to systematic engineering, so that a great number of contents are involved. The construction method is high in technical maturity and has predictable extremely high economic values and social values.
Description
Technical field
The present invention relates to underground pipeline guard technology field science, a kind of underground piping system cathodic protector constructional method is provided especially.
Background technology
In prior art, employing heavy caliber steel water-transmission line has advantages of safety, reliable and the construction period is short, is in current water delivery engineering, to compare common method.This technique is mainly by operation between working shaft, to carry out pipeline jacking to bury underground, except working shaft, ground excavation is not carried out on other pipeline approach ground, adopt traditional corrosion prevention technique to be difficult to thoroughly solve push pipe pipeline endurance issues, bring a new difficult problem to durability Design and the construction technology of pipeline.From current built push pipe pipeline situation, mainly there is corrosion protection coating performance and this construction technology matching problem in this, weld repaired mouth matching problem, relay well coating protection problem, and cathodic Protection Design and construction technology problem etc.Application about heavy caliber steel push pipe pipeline weather resistance has become with more worth technical barrier urgently to be resolved hurrily.
In big and medium-sized cities enlarging or newly-built water-transmission line engineering, conventionally burying underground builtly in the soil of pipeline or on ground has urban infrastructure or a buildings, adopt open excavation to bury heavy-caliber pipeline underground and can destroy these built urban infrastructures, as: road surface, green belt, structures etc., this brings difficulty to burying pipeline construction underground, also make construction cost significantly improve, and city resident's orthobiosis is brought to impact.Non-excavation is buried the progress of pipeline technology underground and is improved and makes people see the hope of dealing with problems in recent years, the method that current non-open type is buried pipeline underground mainly contains shielding method, directional drilling method, jacking, wherein jacking pipe construction process is applicable to heavy caliber steel pipeline construction, comprehensive cost is low, operating efficiency is high, minimum on urban facilities and resident living impact.
If land-based area water-transmission line is buried darker, the 3.6 meters of push pipe pipelines of diameter of take are example, and the depth of burying, all more than 10 meters, points out in the graduate report of survey of Shanghai geotechnology survey and design, and when depth of soil is greater than 10 meters, soil resistivity is less than 10 Ω m mostly.For example, if ground water table higher (: there are rivers and canals many places on the way), estimates that this type of edatope has stronger corrosion failure to steel pipeline.In addition, to some distinguishingly corrosion of depot siding, also should especially pay close attention to, for example: have magnetic suspension train to pass through part, be provided with AC Substation part.The galvanic corrosion that these places also all may bring larger stray current to cause to pipeline.
Attachment weld and adopt the corrosion prevention of the weld of relay well technology pushing pipe also to need especially to pay close attention between pipeline section in jacking construction process.
In a word, the etching problem of underground construction steel push pipe can not be ignored, and for ensureing this project weather resistance, must take corresponding corrosion prevention measure to steel push pipe.And, if steel push pipe is buried underground deeply, must cause maintenance difficult, the more impossible pipeline of midway changing, so the corrosion prevention measure of this class steel push pipe must be reliable, life requirement is high.But due to this pipeline distance, bury underground dark and require non-excavating construction, its corrosion prevention faces many problem demanding prompt solutions.
1,, in prior art, the brief introduction of buried steel push pipe corrosion protection method is as follows:
The corrosion of steel push pipe in soil be due to certain parts of steel in itself and the formed battery of edatope in anode status, current potential is lower, because electronics runs off, causes corrosion, sees Figure 18.
In order to suppress corrosion, people adopt following several means of defence:
1) reserved corrosion allowance: the large-diameter steel pipe that adopts heavy wall, rely on the corrosion allowance of steel self to reach requirement life, this method needs expensive iron and steel resource, and manufacture and installation costs higher, long construction period, needing strongly professional tubulation equipment, also there are the problems of terms of mechanics in this for bigbore steel push pipe.In addition, the destruction that the steel push pipe that only leaves corrosion allowance may produce Unpredictability due to local corrosion and stress corrosion at soil corrosion environment.Meanwhile, China also seldom possesses the heavy caliber of production in enormous quantities in enormous quantities hyper-thick pipe steel pipe ability at present.
2) corrosion-resisting alloy steel: over nearly 50 years, material scholar has developed multiple corrosion resistant low-carbon alloy steel and stainless steel, comprise 10CrMoAl, 304,316L and 00Cr26Ni7Mo2Ti etc., although its erosion rate is low more than 2 times compared with plain carbon stool, but weldprocedure is complicated, easily in weld and heat affected zone, produce serious spot corrosion, galvanic corrosion, stress corrosion etc., thereby reduced the security of the structural entity of using, and cost is also higher.
3) supercoat or organic protection lining are anticorrosion: since the mid-eighteenth century, Europe adopted coal tar, the anti-corrosion method of oleum lini as metal; protective coating obtains flourish; become metallic substance anti-corrosion measure the most widely, corrosion protecting coating has formed organic coating, sand-cement slurry, enamel paint and the large system of metal cladding 4.On the whole, construction is simple, is applicable to all corrosive environments for coating antiseptic etching method, but it is as protective devices independently, need to possess environmental sound, intact feature in whole military service process.Need to and follow-up in servicely there is not obvious breakage in prefabricated, installation, carrying in this, otherwise can aggravate the corrosion of regional area.Lining is anticorrosion mainly using materials such as rubber, glass reinforced plastic, polyethylene as lining, carries out the method for special more protection in part.
4) cathode protecting process: since it being carried out to galvanic protection on the Dai Wei of Britain in 1836 is connected to cast iron the brass of hull first, the method is extensively promoted, indispensable especially in the protection of buried pipeline.The principle of galvanic protection is to take artificial means that steel current potential is reduced, thereby suppresses the corrosion of steel.This point can find out from the pH-Electric Potential Graph of steel, and at the current potential of steel during lower than a certain value, steel, in etch state not, are shown in Figure 23.Especially at the current potential of steel lower than-0.85V(with respect to saturated copper/copper sulfate reference electrode, be called for short CSE) after, the corrosion of steel can be ignored, therefore-0.85V/CSE also becomes the current potential criterion of steel galvanic protection, in cathodic protection engineering, is extensively adopted.
Reaching the method that such object takes is that electronics is flowed from outside towards steel, thereby reduces the corrosion speed of steel, as shown in Figure 24,25.
Different according to the means that reduce steel construction current potential, galvanic protection means are divided into impressed current (Figure 24) and two kinds of methods of sacrificial anode (Figure 25), and both contrasts see the following form 1.
The relative merits of two kinds of galvanic protection modes of table 1
As can be seen from Table 1, sacrificial anode method does not need additional power source, and stability is high, substantially need not keep in repair, but the initial stage has high input in design period.Impressed current method the method is to utilize rectifier that galvanic current is provided, and by supplementary anode, to underwater steel construction, provides required protective current, thereby reaches the object of protection.Need to have external source, equipment must be managed, maintenance, and initial investment is less, once but extraneous power supply disconnects, and steel construction will lose protection.From investigation result, under ocean environment, atomospheric corrosion degree is regional much serious compared with other, safeguards that the equipment difficulty of impressed current method needs is very large.In many engineerings, although adopted strict preventive means, the equipment such as potentiostat constantly go wrong in application process, have seriously undermined the effect of galvanic protection.Meanwhile, impressed current equipment needs professional to safeguard incessantly for a long time, has expended a large amount of manpowers.Therefore, the galvanic protection of the facility of most heavy constructions in recent years adopts sacrificial anode method.The husky gigantic project of green grass, complex structure, impressed current method will be very complicated engineering, poor reliability, and can be to relevant electric power facility, as generation severe jammings such as telecommunication cables.Therefore, will tentatively to select sacrificial anode method be this galvanic protection research contents in this research.
But, if only carry out independently galvanic protection with sacrificial anode, consumable anode enormous amount, high cost, can make subregion can not get adequately protecting because of the shielding effect between pipeline itself and pipeline in addition.
5) high-performance coating adds galvanic protection and combines protection:
In order to make up the shortcoming of cathodic protection, started in recent decades to adopt galvanic protection to add coating and combined the method for protection buried pipeline is protected.In the past, the protective system that coating adopted general barrier propterty mostly carries out steel pipe protection as epoxide coal bituminous, low solid part protective system etc.This class corrosion protection coating barrier propterty is poor, shows two aspects of mechanical property and anti-permeability performance, generally only has 10 year life-span under edatope.In push pipe process, the impact that the effect of coating and clay, silt, microlith produces wearing and tearing, scratches, coating damage rate is also very high; Along with the development of coating technology, coated material is under ocean environment, and particularly the long-effective protection validity under galvanic protection condition is significantly improved, as protection latter stage coating protection efficiency can be more than 80%.This anti-medium osmosis, wet adhesion and antikathode separability (compatibility performance that reflection is mated with galvanic protection) that mainly has benefited from coating itself has had improvement significantly, is directly reflected in and implements can guarantee coating protection performance, consistency and work-ing life after galvanic protection.
In sum, heavy caliber buried steel push pipe pipeline should adopt " high-performance coating+sacrificial anode " Combined Protection scheme.But for the steel pipeline of heavy caliber, buried dark and so long distance, be that coating or galvanic protection all face and need the urgent difficult problem solving, describe in detail below.
2, the problem that the corrosion prevention of steel push pipe faces
Up to the present, the distance of completed individual event pipe-jacking project is all shorter, generally only has hundreds of rice, is mainly used in railroad crossing, highway, river or structures.Along with the progress of construction by pipeline jacking method technology, single jacking distance develops into 2000 meters of single jackings by hundreds of rice, and bore is from 1000 millimeters to 4000 millimeters, and tubing, except adopting steel concrete pipe, matrix material, also has the steel pipe push pipe of China's original creation.Because such engineering construction belongs to emerging project, still there is no complete reliable process for corrosion control in order to guarantee the weather resistance of push pipe.Since application heavy caliber, long distance steel push pipe are the main selection schemes that solves enlargement of cities water supply problem, and etching problem is the technical barrier of this scheme application of restriction, so must study as early as possible the corrosion control technology matching with it, and set up corresponding design and constructional method and planning standard.American-Europeanly in recent years wait that developed country's infrastructural project specification is less, quantity is relatively less, particularly steel pipe jacking construction technique seldom application abroad, without ripe supporting pipe-jacking technology and the reference of design and construction standard.For meeting the needs of at present a large amount of engineerings, the corrosion control new technology of independent research large-diameter steel push pipe is badly in need of in China.This technical security, reliability requirement are high, because heavy caliber pipe-jacking pipeline is buried conventionally darker, it is extremely difficult that pipeline corrodes repairing outward.If construction and run duration are because corrosion brings safety problem to bring major disaster to high-density Urban areas.In addition; the embodiment of this technology is different from traditional method; for example; cannot adopt and when excavation buried pipeline, follow the galvanic protection that pipeline laying is welded repaired mouth and buried sacrificial anode underground; more do not allow, excavating and bury sacrificial anode underground from earth's surface opening, must adopt novel welding patch technology and cathodic protection system to meet the weather resistance requirement of shelter of steel push pipe.
Solving steel push pipe pipeline weather resistance key is to adopt the long-acting high-performance coating system protection of " coating+sacrificial anode " Combined Protection scheme-high-quality of take as main, sacrificial anode is auxiliary associating Project for Corrosion Protection, but oppressive force and the strong frictional force of bearing stratum soil sandstone due to the outside surface of pipeline in jacking pipe construction process implementation process, therefore the corrosion protection coating of outer surface of steel tube is except having traditional antiseptic property, also should there is the characteristic that the sandstone of resistance to soil scratches and weares and teares, otherwise in jacking construction process by the integrity of tamper protection coating, the barrier propterty decline of coating was even lost efficacy.Meanwhile, because not having cathode protection technology and the protective coating system of ripe non-excavating construction to match, cause the more difficult realization of integrity of safeguard system, therefore need to carry out the research of coating and two aspects of galvanic protection.
(1) High performance protective coating technical study: heavy caliber pipe-jacking pipeline is buried darker, with digging mode, repair during one's term of military service very difficult, or even impossible, must adopt high performance and long service life protective coating, avoid pipeline protective coating in jacking construction process to damage inefficacy because of construction, guarantee effective weather resistance of coating protection during one's term of military service.At present buried pipeline protective coating life, the principal element that affects coating life was the sticking power of coating, scratch resistance and resistance to permeability performance, these salient featuress further need be improved, and makes coating life bring up to 50 years all about 30 years.
Wherein affect the critical performance parameters of weather resistance:
1) sticking power: by 24 hours/95 ℃/1 grade of standard bring up to 15 days/95 ℃/1 grade;
2) wear resistance: the 100mg by standard brings up to 30mg (1 ㎏, 1000rpm);
3) resistance to water permeability: by 15 days/60 ℃/3% bringing up to 150 days/60 ℃/2.0%.
In jacking construction, each pipe joint pipeline must weld in active well, this is the necessary technological process of this construction technology, after having welded, need this position to carry out corrosion prevention processing, if can carry out corrosion prevention to this position fast and effectively at the construction field (site), need to have within original 4 hours, shorten in 60 minutes completely without the solvent bi-component epoxy coating high strength ambient cure time SLF.The coating performance of this repaired mouth reaches These parameters equally, guarantees the consistence of whole pipeline coating antiseptic performance.
The large tube coupling weld seam of relay well is the interior Welding carrying out underground; this position is the weak link of whole pipeline weather resistance protection; this process implementing should be as far as possible little destruction external protective coating; the integrity that keeps external protective coating; and adopt special process to strengthen the local galvanic protection performance of the large tube coupling weld seam of relay well, guarantee that the weather resistance protection life-span at this position is consistent with the pipeline overall durability life-span.
(2) the long distance steel push pipe of heavy caliber cathode protection technology research
The galvanic protection construction technology of push pipe pipeline must keep non-excavating technological characteristics of construction, the impact on earth's surface and destructiveness is down to minimum, should reach and does not disturb the normal operation of earth's surface facility and do not destroy the requirements such as Landscape.In addition; this cathodic protection system is except meeting the protection of native system requires; also should take into account adjacent facility is not produced to negative influence, can not to other adjacent facility, produce excessive stray current because self-protection requires and disturb, affect the safe operation of adjacent facility.At present, still do not have ripe, with protective coating and galvanic protection enforcements technology that non-excavating construction matches, cause the more difficult realization of integrity of the corrosion control safeguard system of steel push pipe, be the bottleneck difficult problem that in this technology implementation at present, weather resistance is protected.
If push pipe buried pipeline position is darker, mostly over 10 meters.Complicated through regional earth's surface and underground installation, both comprised view section, there are again traffic main artery and residential district, therefore, while implementing galvanic protection, to the protection on earth's surface, be very crucial.In addition, the multiple Infrastructure such as underground electric power, telecommunications, oil transportation in addition, impressed current method may cause interference to it, and final-period management difficulty is also very large.Therefore, suggestion adopts sacrificial anode method to carry out galvanic protection.And traditional galvanic anode protection method is followed and buried sacrificial anode underground in pipeline laying process and carry out, and for the husky push pipe pipeline of green grass of non-excavating construction, the method cannot be implemented.If can adopt Trenchless Technologies to implement galvanic anode protection for heavy caliber pipe-jacking pipeline, will fundamentally solve an integrity difficult problem for weather resistance protection system.
Long-distance Water Transmission Pipeline adopts steel jacking pipe construction process completely, and takes corresponding monitoring, detection and safeguard procedures; Will significantly extend pipeline operation life, reduce integrated operation cost, bring great economic benefit and social benefit.
People expect to obtain the better underground piping system of a kind of technique effect cathodic protector constructional method.
Summary of the invention
The object of this invention is to provide the better underground piping system of a kind of technique effect cathodic protector constructional method.
The invention provides a kind of underground piping system cathodic protector constructional method, it is characterized in that: described underground piping system meets following requirement successively by cathodic protector constructional method:
1. first from the earth's surface 101 of the outside top of underground pipeline 1 to the direction boring of underground pipeline 1, bore dia 10～1200mm, the outer wall of the through underground pipeline 1 in this hole but should not destroy underground pipeline 1; Each hole arranges directly over it along underground pipeline 1, and the spacing between each hole is 100-500m;
The outer pillar 2 of hollow is installed in the hole 2. then getting out to said process, and is made the front end of outer pillar 2 touch underground pipeline 1 outer wall and by outer pillar 2 and underground pipeline 1 outer wall, jointly formed the tubular cavity of relative closure; Outer pillar 2 is specially steel pipe or plastics tubing; Its specification is: intracavity diameter 50-200mm; Outer pillar 2 inside may be filled with some silt 102 contents;
3. descend water string 5: water string 5 is put into outer pillar 2, and make fixed and arranged at feed connecting joint 402 and the underground pipeline 1 outer wall close contact of water string 5 front ends and do not move, then carry out welding operation;
Being constructed as follows of described water string 5: screw rod 501, muff joint 502, telescopic joint pipe 503, sleeve pipe front tab 504, feed connecting joint 402; Wherein:
Front four is all hollow tubular structures; Between telescopic joint pipe 503 and feed connecting joint 402 by sleeve pipe front tab 504, be connected to the one of coaxial line;
On feed connecting joint 402, pre-connection has feeder cable 401, and screw rod 501 is at least one section, between different screw rods 501 or/and be connected to the one of coaxial line between screw rod 501 and telescopic joint pipe 503 by muff joint 502;
Feed connecting joint 402 is arranged on the leading portion of whole water string 5, and feed connecting joint 402 front ends are provided with the inner chamber of sealing, and its nose thickness is 0.2-8mm; The front end face of feed connecting joint 402 closed inner chambers is the conical surface, and the cross section of the conical surface reduces and reduces with the front end face apart from feed connecting joint 402; On feed connecting joint 402, be fixed with in advance feeder cable 401;
4. remote welding: use welding plant that the feed connecting joint of water string 5 front ends 402 and the metal of underground pipeline 1 are partly welded together to form to electrical connection;
5. sacrificial anode 7 constructions: near punching underground pipeline 1 in advance, imbed sacrificial anode 7, and by feeder equipment 4, it is formed and be electrically connected to underground pipeline 1, and finally form Cathodic protection of underground pipeline system; The arrangement pitch of sacrificial anode 7 is 50-500 rice; Arrange in pairs or single layout;
Underground piping system of the present invention cathodic protector constructional method, also includes following preferred content and requires:
The process of holing to the direction of underground pipeline 1 from the earth's surface of underground pipeline 1 outside top meets following requirement: 10～50 meters of hole depths, and corresponding bore dia is 50～250mm, the spacing between each hole is 150-300m;
Boring directly over underground pipeline 1, axially bored line direction is exactly that axis is as far as possible near even overlapping with it with underground utilities cross section geometric centre for circular pipeline;
Boring method: first, above non-excavating construction pipeline, determine the point that carries out surface drilling, then carry out drilling operation;
Punching requires: with underground pipeline 1 vertical direction on, this point should be directly over vertical direction.
Outside inputting in hole and installing, the process of pillar 2 meets following requirement: outer pillar 2 is sent in hole until outside the front end of pillar 2 arrive and touch underground pipeline 1 outer wall; The diameter dimension of outer pillar 2 is from 100～150mm; Outer pillar 2 is steel pipe or plastics tubing, and the pipe end of the outer pillar 2 of contact underground pipeline 1 is fixedly installed the insulated enclosure pad that is useful on buffer protection underground pipeline 1 outer wall; Outer pillar 2 is segmental structure, is thread joined structure between each section; Outer pillar 2 outside surfaces after whole assembling are coated with protective coating.
The water string 5 of outwards putting in pillar 2 meets following requirement:
Being constructed as follows of water string 5: screw rod 501, muff joint 502, telescopic joint pipe 503, sleeve pipe front tab 504, feed connecting joint 402; Wherein:
Front four is all hollow tubular structures; Between telescopic joint pipe 503 and feed connecting joint 402 by sleeve pipe front tab 504, be connected to the one of coaxial line;
On feed connecting joint 402, pre-connection has feeder cable 401, and screw rod 501 is at least one section, between different screw rods 501 or/and be connected to the one of coaxial line between screw rod 501 and telescopic joint pipe 503 by muff joint 502;
Feed connecting joint 402 is arranged on the leading portion of whole water string 5, and feed connecting joint 402 front ends are provided with the inner chamber of sealing, and its nose thickness is 0.2-8mm; The front end face of feed connecting joint 402 closed inner chambers is the conical surface, and the cross section of the conical surface reduces and reduces with the front end face apart from feed connecting joint 402; On feed connecting joint 402, be fixed with in advance feeder cable 401.
In the process of remote welding, meet following requirement: use welding gun 6 and the feeder cable 401 being fixed in advance on feed connecting joint 402 form electrical connection loops to carry out remote welding operation, and feed connecting joint 402 and underground pipeline 1 are welded together to formation electrical connection;
The process of welding meets following requirement: first the welding gun 6 of clamping welding rod is sent into water string 5 inner and make the electrode tip of its front end near the inner chamber front end of feed connecting joint 402, then start welding, to feed connecting joint 402 and the metal of underground pipeline 1 are partly welded together to form to electrical connection;
The outside of the feeder cable 401 after welding extends to earth's surface always; The physical length that feeder cable 401 extends to earth's surface should be more than or equal to 110% for placing the degree of depth in the hole of outer pillar 2;
Being constructed as follows of welding gun 6: electrode grip 601, welding gun bar 602, electric connection line 603; Wherein: electrode grip 601 fixed and arranged are at the front end of welding gun bar 602, and welding gun bar 602 is tubulose, and one end of electric connection line 603 is connecting electrode grip 601, welding gun bar 602 inner chambers of electric connection line 603 by tubulose are drawn out to outside and are connected on welding machine; By means of the following structure being linked in sequence successively, connect into power circuit to complete welding operation: electric connection line 603, electrode grip 601, welding rod 604, feed connecting joint 402, feeder cable 401, welding machine.
Sacrificial anode 7 meets following requirement:
Sacrificial anode 7 is segmentation structure, and outside is that sacrificial anode material layer 701, inside are the steel cylinder 702 of hollow; Between each section, be threaded connection the electrical connection between formation steel cylinder 701, topmost and bottom are provided with the shutoff 704 of sealing use, and top is drawn feeder cable 401 and connected feeder equipments 4 final and underground pipeline 1 formation electrical connection.
Sacrificial anode material layer 701 is specifically selected by multiple material: magnesium anode, and zinc anode, aluminium-zinc-indium is associated golden sacrificial anode, zinc-aluminium-cadmium alloy sacrificial anode.
Outside installing, after pillar 2 and before putting into water string 5, also carry out successively following treating processes:
1. clear well: during clear well, from outer pillar 2 center cavities, the cleaning equipment of remote control is sent to shaft bottom so that cleaning is positioned at the inner foreign material near underground pipeline 1 outer walls of outer pillar 2;
Clear well requires: by affecting the silt 102 of welding effect and sewage etc., clear out of outer pillar 2, fill this simultaneously locate near space position to be welded with clear water or air;
Clear well specifically adopts high pressure water or high-pressure air as working medium; Concrete clear well method meets following requirement one or a combination set of: one, near if soil poor fluidity underground pipeline 1, the clear well treating method adopting is: slightly mention outer pillar 2, the requirement for height improving is 10～100mm, pressurized air or high pressure water are inputted and delivered to shaft bottom to add pressurized air or high pressure water from outer pillar 2 upper ends by means of clear well casing 103, need pressure at 2 more than normal atmosphere, silt 102 ejects from shaft bottom the most at last; Then when keeping pressure, put back to that outer pillar 2 makes it contact with underground pipeline 1 outer wall until outer pillar 2 and underground pipeline 1 close contact, so that the chamber of formation relative closure and can guarantee that clean in outer pillar 2 is beneficial to follow-up welding process and carries out; They are two years old, if removing mud by shaft bottom is difficult for, outside guaranteeing, between pillar 2 and underground pipeline 1 as far as possible in close contact, pressurized air or high pressure water are upwards ejected mud and finally by well head, ejected from outer pillar 2 inside at shaft bottom output squeezing air or high pressure water by being deep into the clear well casing 103 of outer pillar 2 inside; The pressure that pressurized air or high pressure water need requires at 2 more than normal atmosphere, and outer pillar 2 and the underground pipeline 1 outer wall chamber that close contact forms upper opening is all the time beneficial to clearly well and can stopping that dirt enters in outer pillar 2 after clear well;
2. solder joint inspection: the solder joint that will weld between to feeder equipment 4 and underground pipeline 1 after clear well checks in advance, particular exam content is to comprise the horizontal situation at protected underground pipeline 1 place and the silt residual volume at feeding point place;
The requirement of solder joint inspection is: select a test rod 3, being constructed as follows of test rod 3: detect and fill with 301, detect material 302, handle 303; Wherein: handle 303 is shaft-like, handle 303 front ends are being arranged detection filling 301, and the part of detecting material 302 is arranged on to detect fills with 301 inside, and another part protrudes into detection filling 301 outsides towards whole test rod 3 front ends; Detecting material 302 meets the demands: one, nonelastic, after being squeezed, deform and deformation irrecoverable; Its two, can keep in a long time software state, and not lose characteristic through water soaking; Its three, this elastomerics itself has a little viscosity, the silt at part tube wall place can be glued to further clear up weld;
During bottom, hole in test rod 3 extend into outer pillar 2, whether up to standard according to the outer pillar axis deviation degree of concrete shape judgement after the contact surface viscous deformation of the outer wall of itself and underground pipeline 1 after detecting the outer wall of filling with the 301 inner detection materials that arrange 302 and the underground pipeline 1 being detected and pushing; According to detect the particular case that adheres to silt etc. on material 302 judge remaining quantity of sand and mud number and clear up whereby weld.
After remote welding, check and whether meet resistivity and welding strength; The qualified requirement of particular exam is: resistivity requires at 0.1-0.01 ohm; Welding strength requires: use the external force tractive feeder cable 401 of 50-200kg, require can not destroy the welding quality of feed connecting joint 402 and underground pipeline 1.
After remote welding is also qualified, also require to carry out following two kinds of operations:
1. draw off water string 5: after postwelding detection is qualified, draw off the rest part of water string 5 except feed connecting joint 402 and feeder cable 401; Requirement retain leading portion be welded to connect on underground pipeline 1 feed connecting joint 402 and feeder cable 401 fixed thereon in advance, basset in the upper end of feeder cable 401 so that application afterwards;
2. grouted aggregate concrete:
Draw off after water string 5, use cementer 8 at feed connecting joint 402 places, to add protection filler with protection feed connecting joint 402;
Cementer 8 is constructed as follows: grouting bar 801, grouting 802; Wherein: grouting bar 801 be tubular structure, grouting 802 be arranged in grouting bar 801 front ends and its front opening to feed connecting joint 402 places' perfusion protection fillers to protect feed connecting joint 402.
After grouting, feeder cable 401 is introduced near the controlling box being arranged on earth's surface; Then carry out a kind of of following two kinds of operations: one, protecting tube 2 is upwards mentioned to a segment distance: 10-50cm, so that silt soil around can directly contact with feed connecting joint 402; Its two, direct removal protecting tube 2.
Sequence of operations process of the present invention (relating to: cathodic protection system anode well, power feed hole, monitoring holes position) preferably also further meets following requirement:
1, active well spacing: 1016 meters, 10 groups of sacrificial anodes are installed on single pipeline, open 10 anode mounting shafts.Aperture is greater than 400mm, and hole width between centers pipe outer wall is not less than 1.8m.
2, the anode mounting shaft degree of depth is (h+3) m, and h is that earth's surface is to managing the waist degree of depth.
3, anode is arranged on every pipeline both sides, adopts oversheath that anode is installed.
4, anode well position can be adjusted along pipeline laying direction appropriateness, and setting range is (L ± 20) m, and L is anode well and the active well spacing of design in advance.
5, feed mounting hole site is directly over pipeline, near anode mounting shaft, and feed casing diameter 108mm.
6, monitoring holes be positioned at directly over pipeline, adjacent anode point midway, monitoring holes casing diameter 108mm.
7, single pipe is opened 10 of anode well, 5 of power feed hole, and 4 of test holes, count 19,38 of two-wire meters.
The technology of the present invention is comprehensive, and effect is remarkable, constructability operation; The present invention is a systems engineering, and the content relating to is more; Technology maturity is higher, has expected very huge economic worth and social value.
Accompanying drawing explanation
Below in conjunction with drawings and the embodiments, the present invention is further detailed explanation:
Fig. 1 is earth's surface positioning principle schematic diagram;
Fig. 2 is for adding the principle of work schematic diagram of outer pillar 2;
Fig. 3 is clear well principle of operation schematic diagram;
Fig. 4 is solder joint inspection principle schematic;
Fig. 5 is the enlarged view of local structure in Fig. 4, that is: detect and fill with near (301) local structure enlarged view;
Fig. 6 adds the principle schematic of water string 5 in outside pillar 2;
Fig. 7 is the structural representation of water string 5;
Fig. 8 is the structural representation sketch of feed connecting joint (402) in water string 5;
Fig. 9 is remote welding principle schematic;
Figure 10 is the structural representation of welding gun 6;
Figure 11 is the weld position partial enlarged drawing of Fig. 9;
Figure 12 is that remote welding checks the principle schematic that whether meets resistivity and welding strength requirement afterwards;
Figure 13 is perfusion protection filler principle schematic;
Figure 14 is the partial enlarged drawing of Figure 13 bottom border circular areas;
Figure 15 is for drawing off the schematic diagram after water string (5);
Figure 16 is after feeder line construction underground part completes, protecting tube (2) is upwards mentioned former
Figure 17 is that feeder equipment 4 is along underground pipeline 1 construction schematic diagram;
Figure 18 is the corrosion schematic diagram of buried steel pipe in soil;
Figure 19 is the principle schematic that sacrificial anode 7 is arranged along underground pipeline 1 both sides by means of feeder equipment 4, and in Figure 19, underground pipeline 1 should be cross section, but be reduced to a circular outline, represents underground pipeline 1;
Figure 20 is the sacrificial anode structure diagram of the section of mediating;
Figure 21 is with the local structure schematic diagram of assisting sacrificial anode 7 topmost one end of the structure for lifting;
Figure 22 is the right view of Figure 21;
Figure 23 is current potential-PH figure of steel;
Figure 24 is one of steel pipe piling galvanic protection basic structure schematic diagram;
Figure 25 is two of steel pipe piling galvanic protection basic structure schematic diagram.
Embodiment
Embodiment 1
Underground piping system cathodic protector constructional method, described underground piping system meets following requirement successively by cathodic protector constructional method:
1. first from the earth's surface 101 of the outside top of underground pipeline 1 to the direction boring of underground pipeline 1, bore dia 10～1200mm, preferably: 50-250mm, the outer wall of the through underground pipeline 1 in this hole but should not destroy underground pipeline 1; Each hole arranges directly over it along underground pipeline 1, and the spacing between each hole is 100-500m, preferably: 150-300m; With reference to figure 1.
The process of holing to the direction of underground pipeline 1 from the earth's surface of underground pipeline 1 outside top meets following requirement: 10～20 meters of hole depths, and corresponding bore dia is 50～200mm;
Boring directly over underground pipeline 1, axially bored line direction is exactly that axis is as far as possible near even overlapping with it with underground utilities cross section geometric centre for circular pipeline
Boring method: first, above non-excavating construction pipeline, determine the point that carries out surface drilling, then carry out drilling operation;
Punching requires: with underground pipeline 1 vertical direction on, this point should be directly over vertical direction;
The outer pillar 2 of hollow is installed in the hole 2. then getting out to said process, and is made the front end of outer pillar 2 touch underground pipeline 1 outer wall and by outer pillar 2 and underground pipeline 1 outer wall, jointly formed the tubular cavity of relative closure; Outer pillar 2 is specially steel pipe or plastics tubing; Its specification is: intracavity diameter 50-200mm, preferably: 108mm; Outer pillar 2 inside may be filled with the contents such as some silts 102 and sewage; Referring to Fig. 2;
Outside inputting in hole and installing, the process of pillar 2 meets following requirement:
Outer pillar 2 is sent in hole until the front end of outer pillar 2 arrives and touch underground pipeline 1 outer wall; The diameter dimension of outer pillar 2 is from 100～150mm; Outer pillar 2 is steel pipe or plastics tubing, and the pipe end of the outer pillar 2 of contact underground pipeline 1 is fixedly installed the insulated enclosure pad that is useful on buffer protection underground pipeline 1 outer wall; Outer pillar 2 is segmental structure, is thread joined structure between each section; Outer pillar 2 outside surfaces after whole assembling are coated with protective coating;
3. clear well: during clear well, the cleaning equipment of remote control is sent to shaft bottom from outer pillar 2 center cavities and is underground pipeline 1 outer wall and sentence just cleaning and be positioned at the inner foreign material near underground pipeline 1 outer walls of outer pillar 2; Referring to Fig. 3;
Clear well requires: by affecting the silt 102 of welding effect and sewage etc., clear out of outer pillar 2, fill this simultaneously locate near space position to be welded with clear water or air;
Clear well specifically adopts high pressure water or high-pressure air as working medium; Concrete clear well method meets following requirement one or a combination set of: one, near if soil poor fluidity underground pipeline 1, the clear well treating method adopting is: slightly mention outer pillar 2, the requirement for height improving is 10～100mm, pressurized air or high pressure water are inputted and delivered to shaft bottom to add pressurized air or high pressure water from outer pillar 2 upper ends by means of clear well casing 103, need pressure at 2 more than normal atmosphere, silt 102 ejects from shaft bottom the most at last; Then when keeping pressure, put back to that outer pillar 2 makes it contact with underground pipeline 1 outer wall until outer pillar 2 and underground pipeline 1 close contact, so that the chamber of formation relative closure and can guarantee that clean in outer pillar 2 is beneficial to follow-up welding process and carries out; They are two years old, if removing mud by shaft bottom is difficult for, outside guaranteeing, between pillar 2 and underground pipeline 1 as far as possible in close contact, pressurized air or high pressure water are upwards ejected mud and finally by well head, ejected from outer pillar 2 inside at shaft bottom output squeezing air or high pressure water by being deep into the clear well casing 103 of outer pillar 2 inside; The pressure that pressurized air or high pressure water need requires at 2 more than normal atmosphere, and outer pillar 2 and the underground pipeline 1 outer wall chamber that close contact forms upper opening is all the time beneficial to clearly well and can stopping that dirt enters in outer pillar 2 after clear well;
4. solder joint inspection: the solder joint that will weld between to feeder equipment 4 and underground pipeline 1 after clear well checks in advance, particular exam content is to comprise the horizontal situation at protected underground pipeline 1 place and the silt residual volume at feeding point place; Referring to Fig. 4,5;
The requirement of solder joint inspection is: select a test rod 3, being constructed as follows of test rod 3: detect and fill with 301, detect material 302, handle 303; Wherein: handle 303 is shaft-like, handle 303 front ends are being arranged detection filling 301, and the part of detecting material 302 is arranged on to detect fills with 301 inside, and another part protrudes into detection filling 301 outsides towards whole test rod 3 front ends; Detecting material 302 meets the demands: one, nonelastic, after being squeezed, deform and deformation irrecoverable; Its two, can keep in a long time software state, and not lose characteristic through water soaking; Its three, this elastomerics itself has a little viscosity, the silt at part tube wall place can be glued to further clear up weld;
During bottom, hole in test rod 3 extend into outer pillar 2, whether up to standard according to the outer pillar axis deviation degree of concrete shape judgement after the contact surface viscous deformation of the outer wall of itself and underground pipeline 1 after detecting the outer wall of filling with the 301 inner detection materials that arrange 302 and the underground pipeline 1 being detected and pushing; According to detect the particular case that adheres to silt etc. on material 302 judge remaining quantity of sand and mud number and clear up whereby weld.
5. descend water string 5: water string 5 is put into outer pillar 2, and make fixed and arranged at feed connecting joint 402 and the underground pipeline 1 outer wall close contact of water string 5 front ends and do not move, then carry out welding operation; Referring to Fig. 6,7,8;
Being constructed as follows of described water string 5: screw rod 501, muff joint 502, telescopic joint pipe 503, sleeve pipe front tab 504, feed connecting joint 402; Wherein:
Front four is all hollow tubular structures; Between telescopic joint pipe 503 and feed connecting joint 402 by sleeve pipe front tab 504, be connected to the one of coaxial line;
On feed connecting joint 402, pre-connection has feeder cable 401, and screw rod 501 is at least one section, between different screw rods 501 or/and be connected to the one of coaxial line between screw rod 501 and telescopic joint pipe 503 by muff joint 502;
Feed connecting joint 402 is arranged on the leading portion of whole water string 5, and feed connecting joint 402 front ends are provided with the inner chamber of sealing, and its nose thickness is 0.2-8mm; The front end face of feed connecting joint 402 closed inner chambers is the conical surface, and the cross section of the conical surface reduces and reduces with the front end face apart from feed connecting joint 402; On feed connecting joint 402, be fixed with in advance feeder cable 401;
6. remote welding: use welding plant that the feed connecting joint of water string 5 front ends 402 and the metal of underground pipeline 1 are partly welded together to form to electrical connection; Participate in Fig. 9,10,11;
In the process of remote welding, meet following requirement: use welding gun 6 and the feeder cable 401 being fixed in advance on feed connecting joint 402 form electrical connection loops to carry out remote welding operation, and feed connecting joint 402 and underground pipeline 1 are welded together to formation electrical connection;
The process of welding meets following requirement: first the welding gun 6 of clamping welding rod is sent into water string 5 inner and make the electrode tip of its front end near the inner chamber front end of feed connecting joint 402, then start welding, to feed connecting joint 402 and the metal of underground pipeline 1 are partly welded together to form to electrical connection;
The outside of the feeder cable 401 after welding extends to earth's surface always; The physical length that feeder cable 401 extends to earth's surface should be more than or equal to 110% for placing the degree of depth in the hole of outer pillar 2;
Being constructed as follows of welding gun 6: electrode grip 601, welding gun bar 602, electric connection line 603; Wherein: electrode grip 601 fixed and arranged are at the front end of welding gun bar 602, and welding gun bar 602 is tubulose, and one end of electric connection line 603 is connecting electrode grip 601, welding gun bar 602 inner chambers of electric connection line 603 by tubulose are drawn out to outside and are connected on welding machine; By means of the following structure being linked in sequence successively, connect into power circuit to complete welding operation: electric connection line 603, electrode grip 601, welding rod 604, feed connecting joint 402, feeder cable 401, welding machine.
7. after remote welding, check and whether meet resistivity and welding strength; The qualified requirement of particular exam is: resistivity requires at 0.1-0.01 ohm; Welding strength requires: use the external force tractive feeder cable 401 of 50-200kg, require can not destroy the welding quality of feed connecting joint 402 and underground pipeline 1; Referring to Figure 12.
8. after remote welding is also qualified, also require to carry out successively following two kinds of operations:
One, grouted aggregate concrete: draw off after water string 5, use cementer 8 to add protection filler with protection feed connecting joint 402 at feed connecting joint 402 places;
Cementer 8 is constructed as follows: grouting bar 801, grouting 802; Wherein: grouting bar 801 be tubular structure, grouting 802 be arranged in grouting bar 801 front ends and its front opening to feed connecting joint 402 places' perfusion protection fillers to protect feed connecting joint 402; Filler is specially concrete, referring to accompanying drawing 13,14;
After grouting, feeder cable 401 is introduced near the controlling box being arranged on earth's surface.
A well that diameter is limited is only bored in this invention on earth's surface, avoided adopting the destruction of digging mode to earth's surface facility., at underground pipeline 1 open interior, do not reduced the damage to underground pipeline 1.In addition, can implement feeder equipment construction and process according to the galvanic protection of feeder equipment 4 for the less underground pipeline 1 of caliber.Take this feeder equipment 4 as basis, can also build galvanic protection and the Monitoring systems of various ways;
Its two, draw off water string 5: postwelding detect qualified after, draw off the rest part of water string 5 except feed connecting joint 402 and feeder cable 401; Requirement retain leading portion be welded to connect on underground pipeline 1 feed connecting joint 402 and feeder cable 401 fixed thereon in advance, basset in the upper end of feeder cable 401 so that application afterwards; Referring to Figure 15;
Can be for being threaded between other parts of feed connecting joint 402 and water string 5, other parts of water string 5 can be being threaded of segmentation, the rotation direction that is threaded between each section is identical; Between each section be threaded rotation direction from the most front one section with feed connecting joint 402 between the rotation direction that is threaded different;
9. then carry out a kind of of following two kinds of operations: one, protecting tube 2 is upwards mentioned to a segment distance: 10-50cm, so that silt soil around can directly contact with feed connecting joint 402; Its two, direct removal protecting tube 2;
10. sacrificial anode 7 constructions: near punching underground pipeline 1 in advance, imbed sacrificial anode 7, and by feeder equipment 4, it is formed and be electrically connected to underground pipeline 1, and finally form Cathodic protection of underground pipeline system; The arrangement pitch of sacrificial anode 7 is 50-500 rice; Arrange in pairs or single layout;
Sacrificial anode 7 is segmental structure, being constructed as follows of each section of sacrificial anode 7: sacrificial anode material body 701, support steel cylinder 702, sacrificial anode joint 703, sacrificial anode counterweight; Wherein: sacrificial anode material body 701 is tubular, it is fixedly installed on the outer side outside of supporting steel cylinder 702, and in the sacrificial anode 7 of segmental structure, each section is connected to one by being fixed on the sacrificial anode joint 703 order series connection of supporting on steel cylinder 702 each other; Each section of sacrificial anode 7 has a sacrificial anode joint 703 at least; The sacrificial anode counterweight fixed and arranged that anti-floating is used is in supporting steel cylinder 702 internal cavities or on support steel cylinder 702 inwalls;
When sacrificial anode 7 has 2 sacrificial anode joints 703, its the two be arranged in the two ends of the sacrificial anode 7 of segmentation, one of them sacrificial anode joint 703 has female thread structure, on another sacrificial anode joint 703, be provided with the external thread structure of protrusion, cooperatively interacting and connecting as one with two sacrificial anode joints 703 of female thread structure and external thread structure respectively on adjacent two sections of sacrificial anodes 7;
That one end away from sacrificial anode 7 main parts that is arranged on that section of sacrificial anode 7 of end is also provided with the antirust waterproof plug being fixed on sacrificial anode 7;
Sacrificial anode material body 701 is specifically selected by multiple material: magnesium anode, and zinc anode, aluminium-zinc-indium is associated golden sacrificial anode, zinc-aluminium-cadmium alloy sacrificial anode.Its structure is referring to accompanying drawing 20;
Figure 21,22 is respectively a kind of possible structure of whole sacrificial anode 7 topmosts, with assisting structure for lifting and the structure of electrical connection; Assist structure for lifting referring to Figure 21,22 suspension ring structure, the structure of electrical connection in Figure 21,22 for drawing.
The present embodiment only bores a well that diameter is limited on earth's surface, avoided adopting the destruction of digging mode to earth's surface facility., at underground pipeline 1 open interior, do not reduced the damage to underground pipeline 1.In addition, can implement feeder equipment construction and process according to the galvanic protection of feeder equipment 4 for the less underground pipeline 1 of caliber.Take this feeder equipment 4 as basis, can also build galvanic protection and the Monitoring systems of various ways.
Claims (8)
1. underground piping system cathodic protector constructional method, is characterized in that: described underground piping system meets following requirement successively by cathodic protector constructional method:
1. first from the earth's surface (101) of the outside top of underground pipeline (1) to the direction boring of underground pipeline (1), bore dia 10～1200mm, this hole go directly underground pipeline (1) outer wall but should not destroy underground pipeline (1); Each hole arranges directly over it along underground pipeline (1), and the spacing between each hole is 100-500m;
The outer pillar (2) of hollow is installed in the hole 2. then getting out to said process, and is made the front end of outer pillar (2) touch underground pipeline (1) outer wall and by outer pillar (2) and underground pipeline (1) outer wall, jointly formed the tubular cavity of relative closure; Outer pillar (2) is specially steel pipe or plastics tubing; Its specification is: intracavity diameter 50-200mm; Outer pillar (2) inside may be filled with some silts (102) content;
3. descend water string (5): water string (5) is put into outer pillar (2), and make fixed and arranged at feed connecting joint (402) and underground pipeline (1) the outer wall close contact of water string (5) front end and do not move, then carry out welding operation;
Described feed connecting joint (402) is arranged on the leading portion of whole water string (5), and feed connecting joint (402) front end is provided with the inner chamber of sealing, and its nose thickness is 0.2-8mm; The front end face of feed connecting joint (402) closed inner chamber is the conical surface, and the cross section of the conical surface reduces and reduces with the front end face apart from feed connecting joint (402); On feed connecting joint (402), be fixed with in advance feeder cable (401);
4. remote welding: use welding plant that the feed connecting joint (402) of water string (5) front end and the metal of underground pipeline (1) are partly welded together to form to electrical connection;
5. near sacrificial anode (7) construction: punching underground pipeline (1) in advance, imbed sacrificial anode (7), and by feeder equipment (4), it is formed and be electrically connected to underground pipeline (1), and finally form Cathodic protection of underground pipeline system; The arrangement pitch of sacrificial anode (7) is 50-500 rice; Arrange in pairs or single layout.
2. according to the cathodic protector constructional method of underground piping system described in claim 1, it is characterized in that: the process of holing to the direction of underground pipeline (1) from the earth's surface of the outside top of underground pipeline (1) meets following requirement: 10～50 meters of hole depths, corresponding bore dia is 50～250mm, and the spacing between each hole is 150-300m;
Boring directly over underground pipeline (1), axially bored line direction even overlaps with it with underground utilities cross section geometric centre is as far as possible close;
Boring method: first, above non-excavating construction pipeline, determine the point that carries out surface drilling, then carry out drilling operation; Punching requires: with underground pipeline (1) vertical direction on, this point should be directly over vertical direction.
3. according to the cathodic protector constructional method of underground piping system described in claim 1, it is characterized in that: the process of pillar outside inputting in hole and installing (2) meets following requirement:
Outer pillar (2) is sent in hole until the front end of outer pillar (2) arrives and touch underground pipeline (1) outer wall; The diameter dimension of outer pillar (2) is from 100～150mm; Outer pillar (2) is steel pipe or plastics tubing, and the pipe end of the outer pillar (2) of contact underground pipeline (1) is fixedly installed the insulated enclosure pad that is useful on buffer protection underground pipeline (1) outer wall;
Outer pillar (2) is segmental structure, is thread joined structure between each section; Outer pillar (2) outside surface after whole assembling is coated with protective coating.
4. according to the cathodic protector constructional method of underground piping system described in claim 1, it is characterized in that: in the process of remote welding, meet following requirement: use welding gun (6) and the feeder cable (401) being fixed in advance on feed connecting joint (402) form electrical connection loop to carry out remote welding operation, and feed connecting joint (402) and underground pipeline (1) are welded together to formation electrical connection;
The process of welding meets following requirement: first the welding gun of clamping welding rod (6) is sent into water string (5) inner and make the electrode tip of its front end near the inner chamber front end of feed connecting joint (402), then start welding, to feed connecting joint (402) and the metal of underground pipeline (1) are partly welded together to form to electrical connection;
The outside of the feeder cable after welding (401) extends to earth's surface always; The physical length that feeder cable (401) extends to earth's surface should be more than or equal to 110% for placing the degree of depth in the hole of outer pillar (2).
5. according to the cathodic protector constructional method of underground piping system described in claim 1; it is characterized in that: sacrificial anode (7) meets following requirement: sacrificial anode material layer (701) is specifically selected by multiple material: magnesium anode; zinc anode; aluminium-zinc-indium is associated golden sacrificial anode, zinc-aluminium-cadmium alloy sacrificial anode.
6. according to claim 1-5 underground piping system cathodic protector constructional method described in one of them, it is characterized in that: install outer pillar (2) afterwards with put into water string (5) and also carry out successively before following treating processes:
1. clear well: during clear well, from outer pillar (2) center cavity, the cleaning equipment of remote control is sent to shaft bottom so that cleaning is positioned at the inner foreign material near underground pipeline (1) outer wall of outer pillar (2);
Clear well requires: the silt (102) and the sewage that affect welding effect are cleared out of to outer pillar (2), fill this simultaneously locate near space position to be welded with clear water or air;
Clear well specifically adopts high pressure water or high-pressure air as working medium; Concrete clear well method meets following requirement one or a combination set of: one, near if soil poor fluidity underground pipeline (1), the clear well treating method adopting is: slightly mention outer pillar (2), the requirement for height improving is 10～100mm, pressurized air or high pressure water are inputted and delivered to shaft bottom to add pressurized air or high pressure water from outer pillar (2) upper end by means of clear well casing (103), need pressure at 2 more than normal atmosphere, silt (102) ejects from shaft bottom the most at last; Then when keeping pressure, put back to that outer pillar (2) makes it to contact with underground pipeline (1) outer wall until outer pillar (2) and underground pipeline (1) close contact, to form the chamber of relative closure and can guarantee that interior clean of outer pillar (2) is beneficial to follow-up welding process and carries out; They are two years old, if removing mud by shaft bottom is difficult for,, when guaranteeing between outer pillar (2) and underground pipeline (1) as far as possible close contact, pressurized air or high pressure water are upwards ejected mud and finally by well head, ejected from outer pillar (2) inside at shaft bottom output squeezing air or high pressure water by being deep into the clear well casing (103) of outer pillar (2) inside; The pressure that pressurized air or high pressure water need requires at 2 more than normal atmosphere, and outer pillar (2) and underground pipeline (1) the outer wall chamber that close contact forms upper opening is all the time beneficial to clearly well and can stopping that dirt enters in outer pillar (2) after clear well;
2. solder joint inspection: the solder joint that will weld between to feeder equipment (4) and underground pipeline (1) after clear well checks in advance, particular exam content is to comprise horizontal situation that protected underground pipeline (1) is located and the silt residual volume at feeding point place.
7. according to claim 1-5 underground piping system cathodic protector constructional method described in one of them, it is characterized in that:
After remote welding is also qualified, also require to carry out following two kinds of operations:
1. draw off water string (5): after postwelding detection is qualified, draw off the rest part of water string (5) except feed connecting joint (402) and feeder cable (401); Requirement retain leading portion be welded to connect on underground pipeline (1) feed connecting joint (402) and feeder cable (401) fixed thereon in advance, basset in the upper end of feeder cable (401) so that application afterwards;
2. grouting:
Draw off after water string (5), use cementer (8) to locate to add protection filler with protection feed connecting joint (402) at feed connecting joint (402).
8. according to the cathodic protector constructional method of underground piping system described in claim 6, it is characterized in that: after grouting, feeder cable (401) is introduced and is arranged near the controlling box in earth's surface; Then carry out a kind of of following two kinds of operations: one, protecting tube (2) is upwards mentioned to a segment distance: 10-50cm, so that silt soil around can directly contact with feed connecting joint (402); Its two, direct removal protecting tube (2).
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| CN201210408459.6A Active CN103060814B (en) | 2011-10-24 | 2012-10-23 | Construction method of feeding device for underground pipeline system |
| CN201210408360.6A Active CN102912354B (en) | 2011-10-24 | 2012-10-23 | Cathode protection system for underground pipeline system |
| CN 201220550014 Expired - Lifetime CN202954093U (en) | 2011-10-24 | 2012-10-23 | Feeding device construction system for underground pipeline system |
| CN 201220546265 Withdrawn - After Issue CN202936484U (en) | 2011-10-24 | 2012-10-23 | Cathode protection system for underground pipeline system |
| CN 201220546622 Expired - Lifetime CN202936483U (en) | 2011-10-24 | 2012-10-23 | Waterproof sleeve for cathode protection device for underground pipeline system |
| CN 201220549904 Expired - Lifetime CN202954092U (en) | 2011-10-24 | 2012-10-23 | Grouting device for installing feeding device of underground pipeline system |
| CN201210411455.3A Active CN102995027B (en) | 2011-10-24 | 2012-10-23 | Sacrificial anode for cathode protection of underground pipeline system |
| CN201210408715.1A Active CN102995026B (en) | 2011-10-24 | 2012-10-23 | Construction method for cathode protection device for underground pipeline system |
| CN 201220546573 Withdrawn - After Issue CN202936487U (en) | 2011-10-24 | 2012-10-23 | Sacrificial anode used for cathodic protection of underground pipeline system |
| CN2012104084562A Pending CN103060817A (en) | 2011-10-24 | 2012-10-23 | Feeding device for underground pipeline system |
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| CN201210408360.6A Active CN102912354B (en) | 2011-10-24 | 2012-10-23 | Cathode protection system for underground pipeline system |
| CN 201220550014 Expired - Lifetime CN202954093U (en) | 2011-10-24 | 2012-10-23 | Feeding device construction system for underground pipeline system |
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| CN 201220546622 Expired - Lifetime CN202936483U (en) | 2011-10-24 | 2012-10-23 | Waterproof sleeve for cathode protection device for underground pipeline system |
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- 2012-10-23 CN CN201210408459.6A patent/CN103060814B/en active Active
- 2012-10-23 CN CN201210408360.6A patent/CN102912354B/en active Active
- 2012-10-23 CN CN 201220550014 patent/CN202954093U/en not_active Expired - Lifetime
- 2012-10-23 CN CN 201220546265 patent/CN202936484U/en not_active Withdrawn - After Issue
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- 2012-10-23 CN CN201210411455.3A patent/CN102995027B/en active Active
- 2012-10-23 CN CN201210408715.1A patent/CN102995026B/en active Active
- 2012-10-23 CN CN 201220546573 patent/CN202936487U/en not_active Withdrawn - After Issue
- 2012-10-23 CN CN2012104084562A patent/CN103060817A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| CN202954093U (en) | 2013-05-29 |
| CN102995026A (en) | 2013-03-27 |
| CN102995027B (en) | 2015-06-10 |
| CN202936483U (en) | 2013-05-15 |
| CN103060814B (en) | 2014-12-10 |
| CN103060817A (en) | 2013-04-24 |
| CN103060814A (en) | 2013-04-24 |
| CN102912354A (en) | 2013-02-06 |
| CN202954095U (en) | 2013-05-29 |
| CN202936487U (en) | 2013-05-15 |
| CN202954092U (en) | 2013-05-29 |
| CN202936484U (en) | 2013-05-15 |
| CN102995027A (en) | 2013-03-27 |
| CN102912354B (en) | 2014-10-22 |
| CN202936485U (en) | 2013-05-15 |
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