CN103851257B - Based on the trustship construction process in laying cable duct bank - Google Patents
Based on the trustship construction process in laying cable duct bank Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G9/00—Installations of electric cables or lines in or on the ground or water
- H02G9/06—Installations of electric cables or lines in or on the ground or water in underground tubes or conduits; Tubes or conduits therefor
Abstract
The invention discloses and a kind ofly to comprise the following steps based on the trustship construction process in laying cable duct bank, surveying setting-out, excavate foundation ditch, rig creeps into, reaming of pulling back, pipeline welding, channelling of pulling back, pit backfill.This technique can be constructed to trustship effectively, short construction period, and construction quality is good, solves existing method of construction and usually causes pipeline to occur the problem of breaking or circuit cannot be constructed.
Description
Technical field
The present invention relates to a kind of construction process, specifically relate to a kind of based on the trustship construction process in laying cable duct bank, belong to field of electricity construction.
Background technique
Electric power is the energy using electric energy as power.Invented in the 70's of 19th century, the invention of electric power and application have started second time industrialization climax.Since becoming 18th century of human history, one of three scientific and technological revolutions that the world occurs, from then on science and technology changes the life of people.Even the Internet era of current, we still have the demand of sustainable growth to electric power, because we have invented the product of more use electric power such as computer, household electrical appliances.Constantly the occurring of undeniable new technology makes electric power become the necessity of people.The large-scale electrical power system that 20th century occurred is one of most important achievement in the human engineering history of science, the electrical production be made up of links such as generating, transmission of electricity, power transformation, distribution and electricity consumptions and consume system.Be the epoch of internet now, we still have the demand of sustainable growth to electric power, because we have invented the product of more use electric power such as computer, household electrical appliances.The conveying of electric power needs laying-out, generally adopt the conveying of the end, ground and high-altitude conveying, high-altitude conveying needs to set up supporting frame, its engineering is complicated, and very high to geologic requirements, be thus generally adopt the mode of ground end buried pipeline to carry out electric power conveying, and ground end buried pipeline need the impact considering ground confrontation pipeline, conventional construction method, owing to not considering these factors, usually causes pipeline to occur the problem of breaking or circuit cannot be constructed.
Summary of the invention
The object of the invention is to overcome above-mentioned existing method of construction usually causes pipeline to occur the problem of breaking or circuit cannot be constructed, devise a kind of based on the trustship construction process in laying cable duct bank, this technique can be constructed to trustship effectively, solves existing method of construction and usually causes pipeline to occur the problem of breaking or circuit cannot be constructed.
Object of the present invention is achieved through the following technical solutions: based on the trustship construction process in laying cable duct bank, comprise the following steps:
Surveying setting-out: plane control and unwrapping wire: according to existing sideline, the locating point of control point this engineering of pilot measurement provided by the side of exploration is ensure each stage control point net of construction, coordinate and elevation accurate, first controls stake protected each in job site.And each control point pilot measurement is protected outside on-the-spot, so that vertical pilot measurement unwrapping wire.Closed check will be done simultaneously.Arrange one by electronic tachometer along every 3 meters of the center line of trombone slide on ground before construction, and spread lime line along the center line of trombone slide and measured an elevation, calculate stake elevation and design trombone slide flowing water relation of plane;
High process control: according to the vertical control point of the leveling point pilot measurement job site that exploration side provides, high process control adopts twice instrument height Cheng Qian backsight equidistantly to survey method, keep precision, for ensureing the correctness of design direction, position, the transmission theodolite of guide line carries out pilot measurement, ensures the accurate of plan-position;
Excavate foundation ditch: every section of traction needs excavation 2 working pits, comprise entrance working pit, export is cheated, machinery is all adopted to excavate, adopt the supporting of close button steel sheet pile as required, entrance working pit excavation is of a size of 3m, and wide × 10m is long, export hole is of a size of 3m × 5m, the working pit degree of depth is determined according to trombone slide stream water level elevation, export hole provides waste pipe to enter hole working pit when being back to drag, export hole size is identical with entrance working pit with method of construction, for ensureing working pit inner drying and reaming construction, (4m wide × 1.5m length × 1.5m is dark) mud-settling pit is established in working pit southern side, and at the bottom of pond, establish slurry pump to extract out outside hole by unnecessary mud at any time, working procedure is: beat steel sheet pile supporting → remaining mud → working pit of cutting the earth → clear and enclose and cover, manually the process of dredging notes the underground utility not damaging walk,
Rig creeps into: on-the-spot must first anchoring stablizing transported to by rig, if rig anchoring is unstable, power loss will occur or power acts on it machine, cause the injury of machine and people.Rig relies on ground anchor base and rear support to fix with ground, and laying before rig should first smooth location, and the rig angle of inclination according to designing in advance adjusts, and relies on rig power to squeeze in soil by anchor pole, makes rear support and front base anchor and formation consolidation stable.
After driller insertion, adjustment rig guide rod is to the position a little more than design Guan Wei center elevation, and level pierces in soil.In starter, transmitter is installed, by geoceiver, record the degree of depth of drill bit, duckbilled plate towards angle, the parameter such as zenithal angle of hole, temperature of diamond bit and battery condition, parameter will be recorded and drilling track contrasts, to correct in time.Geoceiver has display and emission function, and information wireless at the bottom of the hole received is sent to the receiver of rig and shows, and operator is handled rig according to signal feed back and crept into by correct track.The signal that technician beams back according to prober in guided bore hole process, judges guide head position and the deviation of creeping into route map, adjusts at any time.And adjustment records of values in " creeping into position " corresponding form.In order to ensure that the instruction that guide head can send in strict accordance with operator is advanced, need to be encrypted refinement to control point after pipe-line is tentatively layouted.Interval 3m establishes center line, vertical control point, makes distinguishing mark with timber, and builds out fender pier protected with concrete around stake point.Controllers, in strict accordance with a position, handles instrument.By the effect of gravity in the process that tubing pulls in hole, pipeline sinkage can be there is.Therefore guide digging creep into point selection in the place a little more than design pipe center line, to lower the impact of self weight of pipeline on elevation.
Bore the good of liquid and serve extremely crucial effect with the success or failure badly for pipe in pipe pulling construction.Bore liquid and there is cooling drill bit, lubrication drilling tool, the more important thing is and can suspend and carry drilling cuttings, the mud making mixed drilling cuttings become flowing, successfully outside tap hole, both providing enough annular spaces for returning hauling pipe line, can reduce back again weight and the resistance of hauling pipe line.The mud remained in hole can play the effect of retaining wall.For improving mud property, sometimes appropriate chemical treatments to be added.Caustic soda (or soda ash) can thickening, increase gel strength, regulate pH value, drop into caustic soda amount be generally 2% of bentonite clay amount.Mud configuration adopts: bentonite clay (import): 35% ~ 45%, drigpae (import) 1% ~ 2%, caustic soda: 0.5% ~ 0.8%, water: 65% ~ 55%.
Adopt precision be 0.1% guided radar control creep into absolute altitude, guiding absolute altitude control at tube hub line position, the first paragraph of drilling rod track is inclination section, control the incident angle of drilling rod and the direction on drill bit inclined-plane, slowly give and then non rotating drill bit, drill bit just can be made to creep into by the inclination section of design
Inclination section distance L:
Drilling rod reference angle a:
In formula: h-buried depth, R
1-inclination section radius of curvature
Drill bit arrives inclination section and completes place, and ensuing is creeping into of waste pipe flowing water section; Roller bit, and the power of feeding is provided, drill bit just can creep into along horizontal linear, owing to having installed state-of-the-art detection instrument in bit location, by the accurate receiving instrument in ground in drilling process, by receiving instrument data point reuse angle of drill bit, make to creep into and advance according to production line absolute altitude route.Arrival export is cheated, and completes drilling operating.Rig is furnished with a portable earth's surface gyropilot at random, in order to determine the position of drill bit at the bottom of ground, and monitoring drill bit whether off-design track.At inclination section, drill bit often creeps into the position that 10cm just surveys a drill bit, just monitors once every 20cm in tiled segments.If discovery offset track, just by the direction on adjustment drill bit inclined-plane, rectify a deviation.But correction can not be too anxious, because drilling rod has certain rigidity after all.Correction should be completed in several drilling rods, correction can not be completed in a drilling rod, also will note not rectifying a deviation excessively simultaneously.
To pull back reaming: control drill bit and walk around underground obstacle according to predetermined direction and to go directly destination, then den bohrkopf abbauen changes the outfit the backhaul amplifier of appropriate size and specific type, enable, while retracting drilling rod, boring is extended to required diameter, employing several times are expanding, first time reaming is 300mm, second time reaming is 500mm, and so analogize, reaming is to 1.5 times of caliber; During reaming of pulling back traction, mud effect particular importance, lacking mud in hole can cause the contingencies such as collapse hole, makes guide digging ineffective and creep into for again to hide some dangers for.Consider that stratum mud is more easily missed, after lose returns, lack mud in hole, drilling rod and the frictional force between pipeline and hole wall increase, and cause pulling force to increase.Therefore to remain in whole drilling process and have " returning slurry ", and adjust brill liquid proportioning in time with the different mud produced according to the change of geological condition.
Pipeline welding: the success that the quality of pipe joint quality directly has influence on pipe in pipe pulling construction is carried out, pipeline welding adopts electric smelting connection and hot-melt adhesive paste, melting connection, two pipeline sections respectively should stretch out the certain free length of jig, check and correction link, make it on the same axis, misalignment should not be greater than 10% of wall thickness, and temperature of heating plate is suitable for (220 ± 10 DEG C), when tutorial light is bright, used Deng 10 minutes, to make whole temperature of heating plate even;
To pull back channelling: tubing weld seam and pipeline strength are after the assay was approved, with " the tubing big envelope " of field fabrication, tube head is sealed, then connect back in tube head rear end and expand head, connect transfer case after pipe to take over, after pipe tieback to active well, unload and expand head, transfer case, taking-up residue drilling rod next time, block block head, carry out the hydrostatic test; Reaming successfully to after requiring, return drag before to carry out the operation of pipeline connection, by hot melt, binary wall twisting and pipe is connected into and the pipeline becoming hole length suitable, pipeline is connected with reamer, pull back and draw in inlet hole hole by pipeline, after pipeline draws and leads to, reply invert elevation carries out duplex measurement.Pulled in pipeline by the drill bit that prober is housed with rig, tester determines the degree of depth of drill bit according to the signal that prober sends, after converting, namely calculate end elevation in pipe.The result drawn and original control track elevation compare, and just obtain each stake position height variation numerical value.
Pit backfill: after trustship construction completion, carry out backfilling of earthwork, based on machinery, hand fit, back-filling in layers, every layer thickness is 30cm, and tamps, when being backfilling into distance 0.5 meter, ground, adopt 37 lime earth backfill, the height of backfill and main body pavement of road elevation coincide.
In sum, the invention has the beneficial effects as follows: this technique can be constructed to trustship effectively, short construction period, construction quality is good, solves existing method of construction and usually causes pipeline to occur the problem of breaking or circuit cannot be constructed.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
Embodiment:
Based on the trustship construction process in laying cable duct bank, comprise the following steps:
Surveying setting-out: plane control and unwrapping wire: according to existing sideline, the locating point of control point this engineering of pilot measurement provided by the side of exploration, one is arranged by electronic tachometer along every 3 meters of the center line of trombone slide on ground before construction, and spread lime line along the center line of trombone slide and measured an elevation, calculate stake elevation and design trombone slide flowing water relation of plane;
High process control: according to the vertical control point of the leveling point pilot measurement job site that exploration side provides, high process control adopts twice instrument height Cheng Qian backsight equidistantly to survey method, keep precision, for ensureing the correctness of design direction, position, the transmission theodolite of guide line carries out pilot measurement, ensures the accurate of plan-position;
Excavate foundation ditch: every section of traction needs excavation 2 working pits, comprise entrance working pit, export is cheated, machinery is all adopted to excavate, adopt the supporting of close button steel sheet pile as required, it is long that entrance working pit excavation is of a size of the wide * 10m of 3m, export hole is of a size of 3m*5m, the working pit degree of depth is determined according to trombone slide stream water level elevation, export hole provides waste pipe to enter hole working pit when being back to drag, export hole size is identical with entrance working pit with method of construction, for ensureing working pit inner drying and reaming construction, (4m wide * 1.5m long * 1.5m is dark) mud-settling pit is established in working pit southern side, and at the bottom of pond, establish slurry pump to extract out outside hole by unnecessary mud at any time, in foundation trench both sides, 8 ~ 10 meters of spacing are evenly arranged pipe well, well depth 10m ~ 12m, perforate 600mm, chimney filter adopts 300mm, the non-sand concrete filter pipe of external diameter 400mm, pipe well is positioned at 1.5 meters, foundation trench both sides, surface drainage: underground water that pipe well is taken out enters rain sewage inspection well or directly enters in trunk canal.Pipe well is located: according to axial line control point, and with theodolite location, basis will be avoided in its position, pore-forming: want smooth after driller insertion and firmly guarantee that not run-off the straight is moved in construction work, porosity should be less than 1%.Pipe well is installed: well casing adopts sand-free concrete water-filtering pipe, and connection will be adopted an effective measure, and makes its close and firm, prevent well casing from misplacing, cause leakage mud, well-flushing: after well casing is installed, between well casing and hole wall, fill the rubble filter layer of 3-8mm in time, rubble impurity content is not more than 3%; Use spade blanking, prevent layering uneven and impact well casing, fill out filtrate and once complete.Fill out well head about 1m the end of from, top adopts and does not seal containing the clay of sandstone.Then cleaning filter well, rinses sediment.Cleaning filter well should carry out in bod 8h, in order to avoid overlong time, pit protection mud cake is aging, is difficult to destroy, impact infiltration effect.Draw water: reserve clear water after well-flushing 12-24h, now get final product continuous pumpage.If more muddy, silt content is large, should search reason.Well casing is closed: well casing carries out after being enclosed in and not needing to continue precipitation, tamps when closing under bed course in 2m well casing with C20 concrete, in order to strengthen the waterproofing effect at construction gap place, and water treatment on sidewall of the bottom plate place two pass.
Rig creeps into: rig is transported to on-the-spot first anchoring and stablized, rig relies on ground anchor base and rear support and ground to fix, laying before rig should first smooth location, according to design in advance rig angle of inclination adjust, rig power is relied on to squeeze in soil by anchor pole, rear support and front base anchor and formation consolidation are stablized, adopt precision be 0.1% guided radar control creep into absolute altitude, guiding absolute altitude controls at tube hub line position, the first paragraph of drilling rod track is inclination section, control the incident angle of drilling rod and the direction on drill bit inclined-plane, slowly give and then non rotating drill bit, drill bit just can be made to creep into by the inclination section of design,
Inclination section distance L:
Drilling rod reference angle a:
In formula: h-buried depth, R
1-inclination section radius of curvature, gets 1200d, substitutes into data and can calculate L value and a value.
Drill bit arrives inclination section and completes place, and ensuing is creeping into of waste pipe flowing water section, mud pressure 1 ~ 5Mpa, flow: 50 ~ 90L/min, mud balance: 1.8 ~ 2.0g/cm3, rig rotating speed: 160 revs/min, moment of torsion: 8000 ~ 10000N.m, push-pull effort: 18 ~ 20T.
Rig adopts horizontal directional drilling method; its main feature is; the drilling rod that wedge drill bit is housed can be driven to pierce from ground according to pre-designed traction circuit; ground instrument receives the information sent by conveyer in subterranean drill bit; control drill bit to walk around underground obstacle according to predetermined direction and to go directly destination; then den bohrkopf abbauen changes the outfit the backhaul amplifier of appropriate size and specific type; enable, while retracting drilling rod, boring is extended to required diameter, and the while of the pipeline of being mated formation by needs, return leads go back to bore entrance place.In whole work, the boring mixed solution that special mixing unit provides constantly sprays from the brill mouth mouth of drill bit, and in order to lubricates drill bit, drilling rod and reinforcing drilled passage, to improve the working efficiency of whole engineering.
Check that whether the power supply of the surveying instrument of rig is sufficient, not enough replacing battery, particularly probe battery more can not be careless, handles instrument according to surveying instrument operating specification, and probe is put in probe cassette, open receiving machine and synchronized display, whether normally rotate probe cassette checking apparatus, probe cassette and drill bit are connected and is connected on drilling rod, start conveying drill-in fluid, check that whether bit nozzle is unimpeded, start the machine and carry out deflecting and horizontal directional drilling.
The upper and lower joint of drilling rod aligns, and limit slowly feeds in the slow-speed of power limit and detains, must not overtorquing, and driller insertion wants strict centering, ensure rig steadily, horizontal drilling.Conscientiously will check drilling rod before spudding in, find to bend and want timely straightening or replacing, rate of penetration is unsuitable too fast, rationally should set up the power of feeding according to formation condition.Determine rate of penetration according to Seines types, at fluffing of moulding sand layer no more than 3m/min, in hard stratum, rate of penetration is not beated with rig and is advisable.And running check bit wear degree, find serious wear, carry out Welding Repair in time, during deflecting jacking, each jacking drilling depth controls at about 0.5m as well, curve will delay, foreign material must not be entered in drilling rod, in order to avoid blocking bit nozzle, when oil pressure alarm tutorial light is bright, explanation oil pressure is abnormal, check, when machine oil blocking alarm indicator lamp is bright, change machine oil filtering element (cartridge), when changing Pump output, first declutch, must not belt speed gear shift, when in water pump long period idle situation, its gearbox should be hung neutral, after to close clutch, to keep the release bearing in clutch operating system, after starting rig by specification, horse back full load is not allowed to creep into, first must carry out running in, after determining that each several part works well, can start to creep into.
To pull back reaming: control drill bit and walk around underground obstacle according to predetermined direction and to go directly destination, then den bohrkopf abbauen changes the outfit the backhaul amplifier of appropriate size and specific type, enable, while retracting drilling rod, boring is extended to required diameter, employing several times are expanding, first time reaming is 300mm, second time reaming is 500mm, and so analogize, reaming is to 1.5 times of caliber;
Pipeline welding: pipeline welding adopts electric smelting to connect, electric smelting connects facility and should correctly be communicated with electric melting pipe fittings, during connection, voltage and the time of electrified regulation meet the regulation that electric smelting is connected facility and electric melting pipe fittings, and electric smelting connects cool time, mobile link part or link must not must not apply any external force, electro-fusion socket connects tubing connecting end and should cut vertically, junction surface should clean totally, and should show insertion depth, scrapes off the oxide layer on surface.Before connection, corresponding link, make it on the same axis, main connection part lower end should adopt support, and fixed anastomosis, when pipeline connects, when construction site condition allows, can weld on groove, after welding, to check in peephole material whether jack-up, whether weld joint has material to extrude.Qualified weld bond should be in fusion process, and without emitting the phenomenons such as (wearing) fire, shutdown too early, the peep hole of electric melting part has material to eject.
Pipeline welding adopts sweat soldering, applying clean cotton without dirt and clean on hot-melt adhesive paste forward and backward fastening means heating surface, hot-melt adhesive paste heating time and heating-up temperature should meet the regulation of hot-melt adhesive paste tool production factory and tubing, pipe fitting factory, hot-melt adhesive paste pressurize cool time, mobile link part or link must not must not apply any external force, before pipeline connects, tubing is fixed in frame, take off milling cutter, closed jig, to the end face of pipe
carry out milling, when forming continuous print and cutting, exit jig, check the gap (must not 3mm be greater than) at pipe two ends.Electric smelting junction surface should clean totally, scrapes just surface skin, melting connection, two pipeline sections respectively should stretch out the certain free length of jig, and check and correction link, makes it on the same axis, misalignment should not be greater than 10% of wall thickness, suitable 230 DEG C of temperature of heating plate, when tutorial light is bright, is preferably waiting use in 10 minutes, to make whole temperature of heating plate even, the heating plate of proper temperature is placed in frame, closed jig, and establishes the pressure of system.After reaching the heat absorption time, open jig rapidly, take off heating plate.Should avoid colliding with the end face of melting, rapid closing jig, and at the appointed time, evenly pressure is adjusted to working pressure, press button cool time simultaneously.After reaching cool time, press one time cool time button, pressure is reduced to zero, open jig, take off the pipe welded, unloading before pipe must by Pressure Drop most zero, if mobile welding machine, hydraulic hose should be pulled down, and carry out joint dust-proof working, qualified weld seam should have two flange, on the pipe excircle of welding bead turnup, the shape of two flange, size uniformity, pore-free, bubbling and crackle, the root in the gap between two flange is not less than the surface of institute's welded tube, when pipeline connects, when construction site condition allows, can weld on groove, the mouth of pipe should block temporarily.Operate under strong wind atmosphere, take protective measure or adjustment construction process.
To pull back channelling: tubing weld seam and pipeline strength are after the assay was approved, with " the tubing big envelope " of field fabrication, tube head is sealed, then connect back in tube head rear end and expand head, connect transfer case after pipe to take over, after pipe tieback to active well, unload and expand head, transfer case, taking-up residue drilling rod next time, block block head, carry out the hydrostatic test; Reaming successfully to after requiring, return drag before to carry out the operation of pipeline connection, by hot melt, binary wall twisting and pipe is connected into and the pipeline becoming hole length suitable, pipeline is connected with reamer, pull back and pipeline is drawn in inlet hole hole, the break on tubing is undirected.Horizontal maximum deviation ± 0.3 meter.Longitudinally vertical maximum deviation ± 0.25 meter.Holding tube inwall is clean, shutoff inwall in trombone slide process.In trombone slide process, operator controls plan-position and the high process control drill bit trend of stake in strict accordance with the pre-cloth in ground, checks once every horizontal equivalent 3 meters.
Pit backfill: after trustship construction completion, carry out backfilling of earthwork, based on machinery, hand fit, back-filling in layers, every layer thickness is 30cm, and tamps, when being backfilling into distance 0.5 meter, ground, adopt 37 lime earth backfill, the height of backfill and main body pavement of road elevation coincide.
To cross the river according to excavation situation or to cross section soil property poor, adopt to beat and pull out steel sheet pile supporting measure, load and unload steel sheet pile and should adopt hang at 2.During handling, the steel sheet pile radical of each lifting is too much unsuitable, notices that protection fore shaft is from damage.Steel sheet pile should be deposited on smooth and firm place, carries out compaction treatment if desired to place foundation soil.To note when stacking: the order of stacking, position, direction and layout etc. should be taken into account later easy construction; Steel sheet pile will be stacked respectively by model, specification, length, construction part, and arranges label explanation in stacking place; Steel sheet pile should be stacked respectively, stacks quantity for every layer and is generally no more than 5, and each interlayer wants bolster wood, and chock spacing is generally 3 ~ 4m, and upper and lower layer chock should on same vertical line, and the total height of stacking is no more than 2m.
It is one group that single pile squeezes into method with one piece or two block plates, block-by-block inserted to play from a jiao, until engineering terminates, thisly squeeze into method easy construction, can beat without a break, stake machine track route is short, and speed is fast.First to be winched to by steel sheet pile with crane and insert a some place and carry out pitching pile, during pitching pile, fore shaft will be aimed at, and often inserts one piece and namely puts pile cover, gently in addition hammering; In piling process, for ensureing the perpendicularity of steel sheet pile, controlled in both direction with theodolite; For preventing the displacement of fore shaft center line plane, clamp can be established at the steel sheet pile fore shaft place of piling travel direction, stoping sheet pile displacement.Simultaneously enclosing position purlin calculating in advance every block sheet pile, to check correction at any time.
Arrange 2 layers inside foundation ditch from top to bottom altogether and enclose purlin and inner support and angle brace, enclose purlin and adopt hot rolling wide width wing edge 30H shaped steel, inner support and angle brace adopt Φ 273 seamless steel pipe, wall thickness 10mm.
Hoist should with the starting of vibration hammer time-dependent loading, lifting force is generally slightly less than the compression limit of damper spring; Power supply for vibration hammer should be 1.2 ~ 2.0 times of the specified acc power of the motor of vibration hammer own; The steel sheet pile larger to pulling resistance, adopt the method for intermittent control shaking, vibrate 15min, vibration hammer continuous operation is no more than 1.5h at every turn.
The native hole that steel sheet pile stays after pulling out should backfill process in time, particularly there is the occasion of building, structure or underground utility around, especially should note timely backfill, otherwise often cause surrounding soil displacement and sedimentation, and cause the destruction of Nearby Structure etc. thus.
Pit retaining monitoring, comprises the distortion of the Horizontal displacement of supporting construction, peripherally underground pipelines, level of ground water, stake internal force, axial force of the supports, soil body layering displacement etc.Sedimentation, inclination and horizontal displacement observation point should be set in each corner, foundation ditch top; Supporting sheet pile, the stress supporting, enclose purlin and strain observation point should be arranged on stressed larger position, and quantity and position should be determined in conjunction with field condition.The observation of level of ground water should establish four to observe hole in foundation ditch surrounding.Bottom foundation ditch, resilience and protuberance observation are determined depending on field condition.
Monitoring and the Con trolling index tested, supporting Horizontal Displacement is accumulative is not more than 30mm, and rate of displacement is not more than 3mm/d; Pile body, the stress value enclosing purlin, supporting member and column are not more than 80% of design load; Surrounding road and pipeline Horizontal displacement total amount are not more than 30mm; Level of ground water should lower than design objective.
When going along with sb. to guard him construction, under normal circumstances, close on monitoring target observation in every 2 days 1 time, when daily variation or accumulative variable quantity surpass warning value, monitoring frequency is suitably encrypted, and observes 1 every day.Special circumstances are abnormal or sudden change as Monitoring Data has, and rate of change is bigger than normal, and suitable infill monitoring frequency, until tracking and monitoring.In the Underground Construction stage, each monitoring project observing frequency is 2 ~ 3 times/week, and the supporting removal stage 1 times/day, the elevation control at the end, hole should improve 15-30 centimetre than designed elevation, first drives piles and cuts the earth afterwards, after machinery has dug, then cheats clearly with artificial.To the foundation ditch establishing inner support, in every layer of soil excavation, the part simultaneously excavated, on position and the degree of depth, keep symmetrical, prevent foundation pit structure from bearing unbalance loading.Excavation of foundation pit answers layering to carry out, and the discrepancy in elevation is unsuitable excessive.Soil property is softer, and the discrepancy in elevation should be less.After excavation of foundation pit to designed elevation, the mud of support pile root must be dug clearly, otherwise support pile can be caused to collapse.Foundation ditch bottom surface can not open-assembly time long.Long between interval in the middle of excavation of foundation pit, distortion constantly can increase along with the time.In this case, the intensity increasing supporting construction should be considered.Note the tau-effect of foundation ditch: the ageing problem of excavation slope is obvious, and rainy season is more remarkable.To take into full account and the creep properties of soil layer complete Underground Construction as early as possible.
Utilize this construction process, make the short construction period of trustship, and construction quality is stablized, trustship is not easily broken, and can ensure the laying quality of cable duct bank, increase the service life.
The above; it is only preferred embodiment of the present invention; not any pro forma restriction is done to the present invention, every according to technology of the present invention, method in fact to any simple modification, equivalent variations that above embodiment does, all fall within protection scope of the present invention.
Claims (1)
1., based on the trustship construction process in laying cable duct bank, it is characterized in that, comprise the following steps:
(a), surveying setting-out: (1), plane control and unwrapping wire: according to existing sideline, by the locating point of control point this engineering of pilot measurement of precognition, one is arranged by electronic tachometer along every 3 meters of the center line of trombone slide on ground before construction, and spread lime line along the center line of trombone slide and measured an elevation, calculate stake elevation and design trombone slide flowing water relation of plane;
(2), high process control: according to the vertical control point of the leveling point pilot measurement job site of precognition, high process control adopts twice instrument height Cheng Qian backsight equidistantly to survey method, keep precision, for ensureing the correctness of design direction, position, the transmission theodolite of guide line carries out pilot measurement, ensures the accurate of plan-position;
(b), excavate foundation ditch: every section of traction needs excavation 2 working pits, comprise entrance working pit, export is cheated, machinery is all adopted to excavate, adopt the supporting of close button steel sheet pile as required, entrance working pit excavation is of a size of 3m, and wide × 10m is long, export hole is of a size of 3m × 5m, the working pit degree of depth is determined according to trombone slide stream water level elevation, export hole provides waste pipe to enter hole working pit when being back to drag, export hole size is identical with entrance working pit with method of construction, for ensureing working pit inner drying and reaming construction, establish in working pit southern side 4m wide × the dark mud-settling pit of 1.5m length × 1.5m, and at the bottom of pond, establish slurry pump to extract out outside hole by unnecessary mud at any time,
(c), rig creeps into: rig is transported to on-the-spot first anchoring and stablized, rig relies on ground anchor base and rear support and ground to fix, laying before rig should first smooth location, rig angle of inclination according to designing in advance adjusts, rig power is relied on to squeeze in soil by anchor pole, rear support and front base anchor and formation consolidation are stablized, adopt precision be 0.1% guided radar control creep into absolute altitude, guiding absolute altitude controls at tube hub line position, the first paragraph of drilling rod track is inclination section, control the incident angle of drilling rod and the direction on drill bit inclined-plane, slowly give and then non rotating drill bit, drill bit just can be made to creep into by the inclination section of design,
Inclination section distance L:
Drilling rod reference angle a:
In formula: h-buried depth, R
1-inclination section radius of curvature
Drill bit arrives inclination section and completes place, and ensuing is creeping into of waste pipe flowing water section;
(d), reaming of pulling back: control drill bit and walk around underground obstacle according to predetermined direction and to go directly destination, then den bohrkopf abbauen changes the outfit the backhaul amplifier of appropriate size and specific type, enable, while retracting drilling rod, boring is extended to required diameter, employing several times are expanding, first time reaming is 300mm, second time reaming is 500mm, and so analogize, reaming is to 1.5 times of caliber;
(e), pipeline welding: pipeline welding adopts electric smelting connection and hot-melt adhesive paste, melting connection, two pipeline sections respectively should stretch out the certain free length of jig, check and correction link, make it on the same axis, misalignment should not be greater than 10% of wall thickness, suitable 220 ± 10 DEG C of temperature of heating plate, when tutorial light is bright, wait use in 10 minutes, to make whole temperature of heating plate even;
(f), channelling of pulling back: tubing weld seam and pipeline strength are after the assay was approved, with " the tubing big envelope " of field fabrication, tube head is sealed, then connect back in tube head rear end and expand head, connect transfer case after pipe to take over, after pipe tieback to active well, unload and expand head, transfer case, taking-up residue drilling rod next time, block block head, carry out the hydrostatic test; Reaming successfully to after requiring, return drag before to carry out the operation of pipeline connection, by hot melt, binary wall twisting and pipe is connected into and the pipeline becoming hole length suitable, pipeline is connected with reamer, pull back and pipeline is drawn in inlet hole hole;
(g), pit backfill: after trustship construction completion, carry out backfilling of earthwork, based on machinery, hand fit, back-filling in layers, every layer thickness is 30cm, and tamps, when being backfilling into distance 0.5 meter, ground, adopt 37 lime earth backfill, the height of backfill and main body pavement of road elevation coincide.
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