CN102032393A - Small-bore long distance curved pipe jacking method - Google Patents
Small-bore long distance curved pipe jacking method Download PDFInfo
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Abstract
The present invention discloses a small-bore long distance curved pipe jacking method, belonging to the technical field of architectural construction, and comprising the following steps: constructing a working well; mounting construction equipment; leading in a measuring axis and a benchmark; taking the jacking tubes in position; jacking; grouting; constructing pipelines in the working well; and finishing the cleaning; the construction equipment comprises a development machine, a curved guide machine with an automatic measurement system, a jack and a pump cylinder, wherein the curved guide machine is connected to a back end of the development machine; the jack is mounted in the working well; the pump cylinder is mounted in a duct of the curved guide machine; the pump cylinder is used for conveying thixotropic mud to between an outer wall of the jacking tube and a soil body via a slip casting tube; during the jacking procedure, the adjacent jacking tubes are connected by a pipe joint sleeve. The method of the present invention enables the prior impossible small-bore long distance quick turn construction to be possible; the economic benefit is good, and construction precision is high; the environment problems like traffic obstruction and the like are solved successfully.
Description
Technical field
The present invention discloses a kind of small-bore extra long distance curve push pipe worker method, belongs to technical field of building construction.
Background technique
Pipe-jacking technology is a kind of underground pipeline construction method, and it can pass through surface structures, subsurface construction, highway, rivers and creeks etc.Existing pipe-jacking technology mainly comprises heavy caliber curve pipe-jacking technology, heavy caliber straight line pipe-jacking technology, small-bore straight line pipe-jacking technology.Heavy caliber curve push pipe mostly is the workmen and can enters and operation such as measure in the push pipe, so need grow the distance Curve construction time, often sacrifice economic benefits.
Summary of the invention
The invention provides a kind of small-bore extra long distance curve push pipe worker method, this worker's method can make original impossible osculum path length become possibility apart from the zig zag construction, and it is good in economic efficiency, and the construction precision height, has successfully solved environmental problems such as traffic obstruction.
For achieving the above object, the technical solution adopted in the present invention is:
A kind of small-bore extra long distance curve push pipe worker method may further comprise the steps:
(1) active well construction;
(2) installation of construction equipment;
(3) introduce measurement axis and leveling point;
(4) push pipe tubing is in place;
(5) jacking;
(6) slip casting;
(7) pipeline construction in the active well;
(8) completion cleaning;
In the described step (2), construction equipment comprises development machine, has curve orientation machine, jack, the pump barrel of automatic measuring system, wherein the curve orientation machine is connected the rear end of development machine, jack is installed in the active well, pump barrel is installed in the duct of curve orientation machine, and pump barrel is used for thixotropic slurry is delivered between the push pipe outer pipe wall and the soil body by slurry injection pipe;
In the step (5), in the process of jacking, connect by the tube coupling sleeve pipe between each adjacent push pipe tubing.
Further setting as such scheme, described tube coupling sleeve pipe comprises overcoat and liner, wherein overcoat comprises several rubber rings that are installed in the steel bushing, the both sides acies of steel bushing respectively is equipped with an one-level stepped shaft seal ring, liner comprises that outer wall is the cylindrical shell of tooth bar shape, and cylindrical shell selects for use rubber to make.
This tube coupling sleeve pipe is installed in the pipeline section seam crossing, in engineering practice, the every jacking 1km of top tube coupling sleeve pipe moves back and forth and reaches 10,000 times in the small-bore extra long distance curve push pipe, so intensity, rigidity and sealing to the tube coupling sleeve pipe all have very high requirement, and this tube coupling sleeve pipe just can reach this requirement.The quality of tube coupling bobbin seal performance is also relevant with the soil property performance with the hydraulic head pressure size in addition, so the tube coupling sleeve pipe becomes the key equipment of extra long distance push pipe.This tube coupling sleeve pipe both can be used for the steel pipe push pipe, also can be used for the concrete pipe push pipe.This tube coupling sleeve pipe is made up of overcoat and liner, and this liner plays two effects: the one, play the effect that sealing ends mud, and the 2nd, play the effect that the restriction breach continues to draw back.And the joint fissure of displacement of overcoat can guarantee curve jacking track the time, tube coupling before and after connecting again.
Described liner external diameter is identical with pipe internal diameter, and the width W of liner is 50cm, and thickness is 12mm.
Described rubber ring, one-level stepped shaft seal ring, cylindrical shell are made by wear-resistant rubber.
Described rubber ring, one-level stepped shaft seal ring, cylindrical shell are made by polyurethane.
Described thixotropic slurry, formulated by following component, bentonite clay 130kg, soda ash 4.5kg, CMC 4kg, water 870kg, above proportioning is by the amount of every cubic metre of thixotropic slurry.For extra long distance curve push pipe, tube coupling outer wall frictional resistance is much larger than frontal drag, if inject a certain amount of thixotropic slurry outside tube coupling in jacking, the sliding friction that becomes between solid is the sliding friction between solid-liquid, will greatly reduce resistance.So in the jacking construction, the application of thixotropic slurry is the important measures that reduce the jacking resistance.Inject thixotropic slurry at the tube coupling outer wall in the jacking construction, form the mud cover, reduce the frictional resistance between the tube wall and the soil body.Thixotropic slurry has flowability in conveying and filling process, be colloidal liquid, plays the lubrication drag reduction effect; Through certain quiescence time, it is as a form of gel that sludge consolidating is, and the soil body is had support action; Mud is colloidal liquid again by disturbance during the tube coupling jacking.This process is gone round and begun again through whole jack-in process.The operation key of slip casting drag reduction technology is: how to reduce the quiescence time of thixotropic slurry, how to form complete mud cover.Therefore the configuration to mud also is very important.The performance of thixotropic slurry must be stable, and construction period requires not dehydration of mud, do not precipitate, not fixed, and good flowability should be arranged, and certain denseness is arranged again.And the application's thixotropic slurry just meets above-mentioned requirements.
The thixotropic slurry filling system must satisfy: the pulping device container should satisfy the needs that form the mud cover, and slurry injection pipe should be provided with according to push pipe length and injected hole position, and the tube coupling bobbin seal is reliable; The layout of injected hole is pressed push pipe pipe diameter size and is determined that each section can be provided with 3-5, and the injected hole on the adjacent section can be arranged in parallel or interlaced arrangement; Each injected hole mounting ball valve should be provided with pressure gauge on the injected hole pipeline of push-bench afterbody and other appropriate locations; Before the slip casting, should check the grouting device water tightness, slip casting city pressure should progressively rise to pilot pressure, when mud meets situations such as mechanical failure, pipeline blockage, street corner seepage, can continue jacking after treatment.
The small-bore extra long distance curve of the present invention push pipe worker method, its small-bore diameter that is meant is at the tubing below 1.0 meters; Extra long distance is meant that the jacking distance is more than 1 kilometer; The curve push pipe as its name suggests, is meant jacking axis non-linear pipe-jacking technology.
The beneficial effect of the small-bore extra long distance curve of the present invention push pipe worker method is as follows:
1. adopting the development machine driving, is power with the jack, adopts advanced construction technology and guiding and measuring system, once finishes the above pipeline pipe jacking construction method of 1Km.
2. traffic is disturbed minimum.
3. the damage to house environment on every side is few.
4. be used to pass through ocean, river and water channel, urban road, expressway, railway, airfield runway, river shoal, architectural complex and underground utility complexity or the big intersection underground pipeline construction of road traffic amount.Especially the extra long distance pipeline construction that was fit to the sea, crosses the river, crosses the lake, crosses the architectural complex block.
5. can construct construction safety, efficient height the whole year.Less demanding to soil property, generally be applicable to various soil properties, as silt clay, bury, sandy soil, middle density clay, boulder clay clay and kukersite soil geology such as (gravel, cobbles etc.).
6. social benefit height, and overall cost is low, and man-hour is few.
7. during push pipe curve jacking construction, elevation and axis can be measured by instrument for guiding orientation, and proofread and correct adjustment according to planned course, are easy to construction control.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Structural representation when Fig. 1 constructs for the present invention;
Fig. 2 is the structural representation of tube coupling sleeve pipe among the present invention.
Fig. 3 is top power, mud consumption and the jacking distance relation figure of example 3 of the present invention;
Fig. 4 is the plotted curve of the frictional resistance of example 3 of the present invention.
Embodiment
As shown in Figure 1 and Figure 2, the small-bore extra long distance curve of the present invention push pipe worker method may further comprise the steps:
(1) active well construction;
(2) installation of construction equipment;
(3) introduce measurement axis and leveling point;
(4) push pipe tubing is in place;
(5) jacking;
(6) slip casting;
(7) pipeline construction in the active well;
(8) completion cleaning.
Wherein, in the step (2), construction equipment comprises development machine 1, has the curve orientation machine 3 of automatic measuring system 2, jack 4, pump barrel 5.Curve orientation machine 3 is connected the rear end of development machine 1, and jack 4 is installed in the active well 6, and pump barrel 5 is installed in the duct of curve orientation machine 3, and pump barrel 5 is used for thixotropic slurry is delivered between push pipe tubing 7 outer walls and the soil body by slurry injection pipe 51.
In the step (5), in the process of jacking, connect by the tube coupling sleeve pipe between each adjacent push pipe tubing 7.
Automatic measuring system 2: decide with the water level instrumentation with automatic mensuration machine, vertical miniature method of construction position the plan-position of excavator, operating range is measured the revolution of measuring locomotive wheel automatically by rotary encoder, and revises distance-measuring error by detecting the magnetite that is installed on track at certain intervals.Utilize automatic measuring system can finish three major functions: the trying to achieve of the dynamic coordinate behind initial orientation and position coordinate, the driving, driving trace.Initial orientation and position coordinate: be installed in the mirror and the prism of automatic mensuration machine in vertical shaft portion, aiming, can provide initial orientation and position coordinate.Dynamic coordinate behind the driving: travel and measure backhaul to excavator, according to the fix the position variation at angle and of the automatic mensuration machine in the standby of development machine rear, can will in real time the dynamic coordinate of development machine be showed with stroke value, the fluviograph measured load of a jack.Trying to achieve of driving trace: after the excavation operation finishes, the machine of measuring automatically from the excavator rear before vertical shaft, limit in Guiding machine, travel limit the fix the position variation and the operating range at angle, thus try to achieve driving trace.Its advantage is: operator can control the bend angle of excavator and pressure type curve orientation machine, construction precision height after the deviation of confirming measurement result and planned value on the screen.Shorten minute simultaneously, realized one man operation, saved the labour.
Pump barrel 5: the behind of development machine 1 connects the sludge pump and the pump barrel 5 of auxiliary conveyance fluid.For the frictional force around reducing, pump barrel 5 has been installed and has been injected the device that oiling agent is gone forward side by side and mixed and stirred around the line pipe, and this point is most important for the extra long distance push pipe.Mixing device mixes and stirs pin by the overshooting shape that stretches out the pump barrel periphery and makes soil and mix lubricant around the pipe, and the stratum around pipe forms the mix lubricant layer.Because the mix lubricant layer has certain thickness, oiling agent be difficult for to run off or because of underground water dilutes, can be for a long time, the effect of long distance maintenance oiling agent.Pump barrel will guarantee to hold enough amounts of lubrication, to guarantee lubricant quantity in the jack-in process.Comprise muddy water system and thixotropic slurry system.
Further setting as such scheme, the tube coupling sleeve pipe comprises overcoat and liner, wherein overcoat comprises several rubber rings 82 that are installed in the steel bushing 81, the both sides acies of steel bushing 81 respectively is equipped with an one-level stepped shaft seal ring 83, liner comprises that outer wall is the cylindrical shell 84 of tooth bar shape, and cylindrical shell 84 selects for use rubber to make.The liner external diameter is identical with push pipe tubing 7 internal diameters, and the width W of liner is 50cm, and thickness (tooth top is to the distance of liner inwall) is 12mm.Rubber ring 82, one-level stepped shaft seal ring 83, cylindrical shell 84 are made by wear-resistant rubber, and optimization polyurethane is made.
Thixotropic slurry, formulated by following component, bentonite clay 130kg, soda ash 4.5kg, CMC 4kg, water 870kg, above proportioning is by the amount of every cubic metre of thixotropic slurry.
The thixotropic slurry filling system must satisfy: the pulping device container should satisfy the needs that form mud cover 9, and slurry injection pipe should be provided with according to push pipe length and injected hole position, and pipe seal is reliable; The layout of injected hole is pressed the pipe diameter size and is determined that each section can be provided with 3-5, and the injected hole on the adjacent section can be arranged in parallel or interlaced arrangement; Each injected hole mounting ball valve should be provided with pressure gauge on the injected hole pipeline of push-bench afterbody and other appropriate locations; Before the slip casting, should check the grouting device water tightness, slip casting city pressure should progressively rise to pilot pressure, when mud meets situations such as mechanical failure, pipeline blockage, street corner seepage, can continue jacking after treatment.
The first pipe joint of measurement jacking often has important leading role, and number of times is surveyed in the school that necessary assurance is enough, and will adopt surveyings such as laser orientation and automatic measurement guidance system.In the beginning jacking stage, speed and direction that must strict control push pipe be pushed up first pipe joint and are proofreaied and correct in the jacking deviation process, every jacking 20～30cm, promptly once to center and height measurement; In normal jacking, during every jacking 50～100cm, measure once.After a pipeline section has pushed up, center and elevation are remake a finish construction survey, an interface is surveyed a bit, and survey 2 points of mismatch are arranged.Strict controlling plumbing fixtures center and elevation, diligent top is diligent to be surveyed, and carries out every record in accordance with regulations, carries out and relieves, and measuring recording is complete, clear.The push pipe jacking is unsuitable long downtime, and continuous jacking in general 24 hours is to reduce the jacking resistance.
Application example
Small-bore extra long distance curve push pipe worker method respectively at year February in July, 2007-2008, year March in June, 2008-2009, be applied to year April in June, 2009-2010 in the section of tubing construction of new Chang River city east section sewage conduct engineering, Nanjing Pukou District Pudong road waste water treatment project and way road, Changchun, economic technical development area, Wuhu City and sewage conduct engineering.Example 1,2,3 is illustrated emphatically once more to the aspects such as effect of observation, correction and thixotropic slurry in the small-bore extra long distance curve jacking construction worker method respectively.
Example 1. new Chang River city east section sewage conduct engineerings
New Chang River city east section sewage conduct engineering, mainly be with Xinchang, eastern section, county town, Xinchang county pharmaceutical factory, newly with the industrial sewage that becomes enterprises such as limited company, be pooled to the scholar Ao town sewage treatment works that plans to build by this engineering sewage conduct.Because of this sewage conduct engineering need be passed through new Chang River and plant area's block along the river continuously in pile No. K2+080～K3+100, and this through section is for guaranteeing the stability and the Security of existing building, be provided with the circular curve that radius is 1500m (L-607.055m, a=23 ° of 11 ' 16 ") in intersection point pile No. K2+384.676 place.
This engineering begins construction in July, 2007, in final acceptance of construction in February, 2008.Design sewage pipe caliber is
All thick 16 meters of steel pipe, buried depth.The engineering geology situation is as follows:
(1) sedimentary deposit: this layer mainly moulded the grey mud of shape, silt clay, fine sand, medium coarse sand interlayer and mixed and form bed thickness 4～8m by being saturated flow.
(2) proluvium: this layer mainly formed by being the plastic～mixing such as medium coarse sand, gravelly sand and dust of moulding clay, the inferior sticking scholar of shape firmly and being loose～close slightly shape, and the part has and is lentiform silt clay and rubble.Bed thickness 3～12m.Curve push pipe sewage conduct mainly is embedded in this stratum.
(3) eluvium: this layer is mainly the lam that remains that the granite weathering forms and forms khaki, plastic～as to mould firmly, bed thickness 0.8～7m.
(4) strong weathered granite: brown Huang, Tibetan green, joints development.
Mud in the sedimentary deposit, medium coarse sand interlayer have characteristics such as high-compressibility, dagger-axe are fixed, easy thixotroping, under 7 degree geological processes, have the liquefaction of generation, depression, slippage may, should not be as the supporting course of push pipe pipeline; Lam is more stable, intensity is higher though remain. and buried depth is darker, and bed thickness changes great disparity, strong weathered granite oozes this layer of people, and the push pipe pipeline also should not directly be embedded in this layer: for this reason, the push pipe conduit axis can only be embedded in the proluvium that bed thickness is thicker, more stable, intensity is moderate.Because this layer soil layer more complicated. the clay of moulding shape firmly, inferior bull soil are arranged and be the mud matter bull soil of moulding shape, the detail sand of close in being in addition～loose shape, coarse sand, gravelly sand. level is staggered, mix mutually, in more single soil layer, will run into more difficulty the impelling ratio of push pipe.
At stratum complicated and changeable, can make tool head bigger skew of generation and soil layer release souls from purgatory the characteristics of loss, my unit takes diligent micrometer to entangle in construction on the one hand, gets rid of the wear-out failure of correction hinge; In jack-in process, the pipeline outside bigger section of stratum loss is filled slip casting and polyurethane leak stopping slip casting on the other hand, the drifting sand layer section of escaping is carried out the fixed slip casting of polyurethane.Facts have proved that these two measures are very successful.And the push pipe pipeline is in jack-in process, because
Steel pipe will be the arc section of 1500m through curvature, so is engraved in irregular, intricately when the cross section deformation of steel pipe and tube wall stress and is changing.For preventing the steel pipe partial unstability and guaranteeing engineering safety, in whole jack-in process. the tube wall stress of steel pipe and the distortion and the pipeline bottom surface absolute altitude of transverse section have been carried out tracking and monitoring.At any time feedback construction is adjusted top power, and the common bluebeard got a large amount of science data, for the design and construction of steel top battalion from now on provides important reference data.
New Chang River city east section sewage conduct engineering is in final acceptance of construction in February, 2008, and enables the same year that running state is normal so far.Solved Xinchang county pharmaceutical factory, newly with the industrial sewage emission problem that becomes enterprises such as limited company, significantly improved the environmental condition of new Chang River and two sides thereof, changed and improved people's living standard, go good economic benefit and social benefit.
Example 2. Nanjing Pukou District Pudong road waste water treatment projects
Nanjing Pukou District Pudong road waste water treatment project is the great water environment construction project in Nanjing, is subordinate to waste water control house steward engineering.Engineering is located in bustling merchant district, city, and the sewage conduct trend is mainly along the Pudong road of heavy, and underground utility are intricate, and gas pipeline, water supply pipe, communication pipeline, fire protection pipeline are arranged.Building along the line is intensive, and the underground high voltage cable of 1 220kV is arranged.The sewage conduct form of construction work is a push pipe, pipeline total length 1085m, and caliber is
Steel pipe, absolute altitude is-5.00 one 6.00m at the bottom of the push pipe pipe, buried depth 9.42～11.25m.Wherein curve push pipe radius of curvature is 900m, total length 575m, and 261m constitutes by changeover portion 120m+ curve 194m+ changeover portion.
This area's geological condition complexity, geologic report shows that push pipe is positioned at grey mud matter silty clay, grey sandy silt, underground water content 33%.The soil that push pipe digs out is stream to be moulded and the semi liquid state state, and soil property is quite weak, and the push pipe axis exists the control difficulty.This engineering adopts the small-bore curve pipe pushing technology of extra long distance to construct by my unit year March in June, 2008-2009.
Though 120m changeover portion and 194m curved section push pipe axis have deviation but can also control before the curve push pipe, and jacking during to 380m the push pipe axis just in time on the design axis, later on along with the push pipe axis begins to be offset left, though taking satisfactory after correcting always, but misalignment of axe is still progressively becoming big, and begins out of controlly, and the misalignment of axe maximum value reaches 5.55m, at this moment, also has 76.80m apart from received well.At the problem that takes place, decision takes to force satisfactory after correcting, and step is as follows.
1) enlarges the correction amplitude at driving head correction jack back seat place pading plate.
2) steel plate is set as back seat in both sides up and down at the follow-up pipe joint of driving head place, and fixes with EXPANSION ANCHOR BOLTS, the middle correction jack of placing opens pipe joint by force, forms new correction trend.
3) enlarge the correction scope at jack back seat one side place pad plexiform layers with continuation, increase deviation-correcting function.
In the correction implementation process, controlled for guaranteeing the push pipe axis, carrying out " diligently survey, duty is entangled, slow-readjustment " work conscientiously is the successful key of correction.
Require every very good pipe joint road just to measure once,, and control the interface tube amount of opening well and be no more than 10cm, prevent seepage from now on so that in time understand rectifying effect.Push pipe continue to advance under the situation of having taked above-mentioned satisfactory after correcting, in jacking carried out one-shot measurement during 5 pipe joint roads, record data for driving head position deviation 532cm left, entangle back 23cm to the right, the trend development of becoming better.Survey data according to nearest twice pair of driving head propelling position coordinate as the round tangent line of circular arc, calculates the new radius of curvature that push pipe advances the hole stroke.
Result of calculation: the drift angle is 1 ° 37 ' 28.7 "; Chord length is 66.70m; The amount of opening is 7mm in every pipe joint pipeline joint.
Again driving head deviation coordinate position is connected into curve with designing the circular arc of coordinate position with radius of curvature 1176m, use AUTOCAD in 1: 1 ratio and draw, transverse axis is former design axis.Be marked on survey data on the AUTOCAD figure every day, as long as correction is just continued in driving head position outside the control straight line, makes driving head axis progressively approach recurrence to the right, could consider to cancel rectifying device up to driving head position in the control straight line.
In implementation process, require every day that survey data is marked on the AUTOCAD figure and plot curve, analyze jacking trend and determine whether to need to adjust the correction trend, can accomplish targeted correction like this, reduce disturbance to surrounding soil.Through taking to force method for correcting error, behind the jacking 15 pipe joint roads, driving head axis is deviation left, entangles back 1.45m again, illustrates that new trend forms again, and driving head axis has been aimed at received well.At this moment, will tunnel that the earth pressure value is increased to more than the 0.15MPa in the head soil storehouse, to prevent that excavating the face soil body collapses.To strengthen synchronous pressure injection thixotropic slurry simultaneously, when jacking stops pushing up, constantly mend slurry, good to guarantee that mud cover 9 forms, thus further control surface subsidence.Because each pipe joint pipeline joint one side of curve push pipe is open, is not that full section is stressed, excessive for preventing that top power from increasing, push up the bad borehole wall and pipeline, require relay well all to start, final push pipe pushes up received well portal mouth smoothly.
Summary of experience: 1) each pipe joint pipeline joint one side is open on this curved section, is not that full end face is stressed, but one-sided stressed, its stress is unfavorable for forming curved gesture.2) in entire curve push pipe process, push pipe is because of being one-sided stressed, and not exclusively follows the jacking of driving head correction direction, forms this section push pipe axis when push up the curved section section of taking the air line, and still drifts about according to virgin curve trend, is difficult to entangle back.3) in a single day push pipe jacking trend form, and the original mobile inertia of follow-up pipeline only depends on the development machine correction to be difficult to entangle back for the moment.Must could progressively change trend return by the road jacking of several pipe joints; Therefore, carry out diligent survey, duty is entangled, slow-readjustment work is quite important.
Along with the development of urban construction, the water environment construction is administered engineering and is also being deepened continuously, and urban road can not allow to excavate on a large scale, and therefore, small-bore extra long distance curve pipe jacking construction technique will more and more be widely used.In small-bore extra long distance curve jacking construction, the deviation of curve push pipe axis can take place with conventional pipe jacking construction method; Improve force-bearing situation by changing the pipeline force bearing point, the curve push pipe is advanced along design curvature circular arc.
The small-bore extra long distance curve of Nanjing Pukou District Pudong road waste water treatment project push pipe, solution and successful experience to running into technical problem in work progress can be provided with the back construction and use for reference.
Way road, Changchun, economic technical development area, example 3. Wuhu City and sewage conduct engineering
Way road, Changchun, economic technical development area, Wuhu City and sewage conduct engineering are positioned on the very busy Changchun road of traffic.Close on the North Road, the Changjiang river, the west connects Shunchang industrial and trading company, logical Cherry planning and design institute, north and Qirui Automobile Co., Ltd, east orientation intersects with Pujiang road, North Road, Silver Lake, Zhujiang River road, but south meets enterprise-like corporations such as Wuhu Guoxin Hotel, Nai Fu Placoplatre SA of great river Auto Electronics Corp., new material company of prosperous section, traffic flow is big, and saving the construction time is exactly best social benefit.So this engineering is taked the curve jacking pipe construction process to Pujiang road-Zhujiang River highway section trunk sewer pipeline.This highway section design trunk sewer caliber
Steel pipe, total length 1020m, wherein in North Road, Silver Lake infall corner being set is 2 ° 25 ' 11 ", radius is 7000.000m, length of curve is the circular curve of 295.625m; Buried depth of pipeline 9.30～11.81m.
Big cutterhead slurry-water balance type tool pipe is provided with the floating type big cutterhead that can adjust thrust and cuts and support the front soil body.After thrust was set, cutterhead remained the support to the soil body with floating before and after scholar's pressure size variation, made the soil body keep stable.Muddy water in the muddy water storehouse keeps certain pressure, can play balanced action to the front on the one hand, is the earth that mixing and transportation are cut on the other hand.
Tool pipe adopts two section one hinge socket fitting type structure, 2 road sealing devices is set in the hinged place, and is provided with 4 injected holes, and synchronous grouting when being convenient to construct, mud overlap 9 thickness 20mm.There are 4 two-way cylinder marshallings to rectify a deviation deviation adjustment angle a=± 2.The big cutterhead that floats is driven by 4 hydraulic electric motors, is provided with whirl-stop device between two piece housings.Can prevent that housing from relatively rotating.Be provided with 3 soil pressure cases, show front soil pressure value, the working order of push-bench, various instrument value.Metrical infromation, correction oil cylinder running situation all are reflected on the operating table screen by television camera, and operator can carry out remotely-controlled operation according to these information.
Muddy water is transported in the head muddy water storehouse by bypass valve by advancing dredge pump.Again by be installed in muddy water pipeline mounted pump in the tube coupling and the sludge pump in the active well with the mud emission in the muddy water storehouse in ground deposition tank, the mud hydraulic pressure in the muddy water storehouse can be controlled by the flow of regulating feed-water pump and sludge pump.
Key technology in the jacking: slip casting drag reduction
For long-distance pipe jacking, tube coupling outer wall frictional resistance is much larger than frontal drag, if inject a certain amount of thixotropic slurry outside tube coupling in jacking, the sliding friction that becomes between solid is the sliding friction between solid-liquid, will greatly reduce resistance.So in the jacking construction, the application of thixotropic slurry is the important measures that reduce the jacking resistance.Inject thixotropic slurry at the tube coupling outer wall in the jacking construction, form mud cover 9, reduce the frictional resistance between the tube wall and the soil body.Thixotropic slurry has flowability in conveying and filling process, be colloidal liquid, plays the lubrication drag reduction effect; Through certain quiescence time, it is as a form of gel that sludge consolidating is, and the soil body is had support action; Mud is colloidal liquid again by disturbance during the tube coupling jacking.This process is gone round and begun again through whole jack-in process.The operation key of slip casting drag reduction technology is: how to reduce the quiescence time of thixotropic slurry, how to form complete mud cover 9.Therefore the configuration to mud also is very important.
In order to guarantee the effect of mud jacking, arranged 4 injected holes equably at tool pipe afterbody hoop, in time carry out slip casting during jacking.The performance of thixotropic slurry must be stable, and construction period requires not dehydration of mud, do not precipitate, not fixed, and good flowability should be arranged, and certain denseness is arranged again.To do the mud Mix Ratio Test before the jacking construction, find out in the best mud mixing ratio jacking construction that is suitable for constructing, the pore size that the consumption of thixotropic slurry depends primarily on around the pipeline reaches the characteristic of soil layer on every side, because the effect of the loss of mud and underground water etc., the actual amount of mud is more much bigger than theoretical consumption, the maximum 4-5 that can reach theoretical value doubly but also will do suitable adjustment according to the requirement of soil property situation, jacking situation, surface subsidence etc. in construction.
The thixotropic slurry utilization of this engineering is very successful.The maximum top of the jacking of total length 1020m power is no more than 9000kN.Can obtain the graph of a relation between top power, mud consumption and the distance after top force curve in the jack-in process and mud consumption (ratio of actual amount and theoretical consumption is represented with percentage) curve lumped together, see Fig. 3.
As seen from Figure 3, except that the section of appearing of starting point, comprise that curved section top force curve is all comparatively level and smooth.The maximum value of top power is 9000kN.Owing to can't set up complete mud cover 9 in the stage of appearing, thereby the mud consumption is less, but after mud cover 9 was built up, the mud consumption just increased along with the prolongation of jacking distance.When jacking finished, the mud consumption reached 8 times of theoretical value.Why the mud consumption has bigger increase along with the prolongation of jacking distance, mainly is that ftercompction slurry causes, because along with the increase of circuit, the amount of ftercompction slurry will substantially exceed the mud jacking amount of tool pipe afterbody.
The size of the frictional resistance between the pipeline outer wall and the soil body is to weigh the standard of mud drag-reduction effect.Fig. 4 is the plotted curve of the frictional resistance between pipeline outer wall and the soil body in this engineering jack-in process.
Fig. 4 has reflected and has acted on every m on the tube wall in the jack-in process
2The change in resistance situation.In the stage of appearing, can't set up because mud overlaps 9, thereby frictional resistance is bigger, along with the foundation of mud cover 9.Frictional resistance sharply reduces.When pushing up to 100m.Frictional resistance is 2.11kN/m
2When pushing up to 300m, frictional resistance is 1.1kN/m
2Push up to 750m, frictional resistance is 0.5kN/m
2When pushing up to 1000m, frictional resistance is 0.3kN/m
2And this curve push pipe design radial is bigger, when the curved section, the phenomenon that resistance increases does not on foot take place at pipeline, and above-mentioned the value all value in the standard and the value of utilizing empirical correlation to calculate, also the actual value in the similar engineering in the past.Obviously, to reduce gradually along with the increase of jacking distance be that consumption with mud has to heighten along with the prolongation of jacking distance and is added with direct relation to frictional resistance.
My company constructed to way road, Changchun, economic technical development area, Wuhu City and sewage conduct engineering year April in June, 2009-2010, technical barriers such as utilization of drag reduction thixotropic slurry and axial line control have successfully been solved, for small-bore extra long distance curve jacking construction provides science field data and construction experience accurately, obtained good social benefit.
The foregoing description only is used to the inventive concept of the present invention of explaining, but not to the qualification of rights protection of the present invention, allly utilizes this design that the present invention is carried out the change of unsubstantiality, all should fall into protection scope of the present invention.
Claims (6)
1. small-bore extra long distance curve push pipe worker method may further comprise the steps:
(1) active well construction;
(2) installation of construction equipment;
(3) introduce measurement axis and leveling point;
(4) push pipe tubing is in place;
(5) jacking;
(6) slip casting;
(7) pipeline construction in the active well;
(8) completion cleaning;
It is characterized in that: in the described step (2), construction equipment comprises development machine, has curve orientation machine, jack, the pump barrel of automatic measuring system, wherein the curve orientation machine is connected the rear end of development machine, jack is installed in the active well, pump barrel is installed in the duct of curve orientation machine, and pump barrel is used for thixotropic slurry is delivered between the push pipe outer pipe wall and the soil body by slurry injection pipe;
In the step (5), in the process of jacking, connect by the tube coupling sleeve pipe between each adjacent push pipe tubing.
2. small-bore according to claim 1 extra long distance curve push pipe worker method, it is characterized in that: described tube coupling sleeve pipe comprises overcoat and liner, wherein overcoat comprises several rubber rings that are installed in the steel bushing, the both sides acies of steel bushing respectively is equipped with an one-level stepped shaft seal ring, liner comprises that outer wall is the cylindrical shell of tooth bar shape, and cylindrical shell selects for use rubber to make.
3. as small-bore extra long distance curve push pipe worker method as described in the claim 2, it is characterized in that: described liner external diameter is identical with pipe internal diameter, and the width W of liner is 50cm, and thickness is 12mm.
4. as small-bore extra long distance curve push pipe worker method as described in the claim 3, it is characterized in that: described rubber ring, one-level stepped shaft seal ring, cylindrical shell are made by wear-resistant rubber.
5. as small-bore extra long distance curve push pipe worker method as described in the claim 4, it is characterized in that: described rubber ring, one-level stepped shaft seal ring, cylindrical shell are made by polyurethane.
6. small-bore according to claim 1 extra long distance curve push pipe worker method, it is characterized in that: described thixotropic slurry, formulated by following component, bentonite clay 130kg, soda ash 4.5kg, CMC 4kg, water 870kg, above proportioning is by the amount of every cubic metre of thixotropic slurry.
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| CN2010105369137A CN102032393B (en) | 2010-11-10 | 2010-11-10 | Small-bore long distance curved pipe jacking method |
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