CN103851257A - Paired cable duct bank laying-based support pipe construction process - Google Patents
Paired cable duct bank laying-based support pipe construction process Download PDFInfo
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- CN103851257A CN103851257A CN201410099997.0A CN201410099997A CN103851257A CN 103851257 A CN103851257 A CN 103851257A CN 201410099997 A CN201410099997 A CN 201410099997A CN 103851257 A CN103851257 A CN 103851257A
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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
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Abstract
The invention discloses a paired cable duct bank laying-based support pipe construction process, which comprises the following steps of measuring and setting out, excavating a foundation pit, drilling with a drill rig, pulling back a drilling hole, welding a pipeline, pulling back a laying pipeline and backfilling the foundation pit. The process can be used for effectively constructing a support pipe, is short in construction time and good in construction time and solves the problems that the pipeline is cracked or the line can not be constructed frequently caused by the existing construction method.
Description
Technical field
The present invention relates to a kind of construction process, specifically relate to a kind of trustship construction process based on during cable duct bank is laid, belong to power construction field.
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 industrialization climax for the second time.Since becoming 18th century of human history, one of three scientific and technological revolutions that the world occurs, from then on science and technology has changed people's life.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 people's necessity.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 and the consume system that are made up of links such as generating, transmission of electricity, power transformation, distribution and electricity consumptions.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 to adopt the end, ground to carry and high-altitude conveying, carry in high-altitude need to set up supporting frame, its engineering complexity, and very high to geologic requirements, thereby be generally to adopt the mode of ground end buried pipeline to carry out electric power conveying, and ground end buried pipeline need to be considered the impact of 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, design a kind of trustship construction process based on during cable duct bank is laid, this technique can be constructed to trustship effectively, has solved existing method of construction and has usually caused 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 during cable duct bank is laid, comprise the following steps:
Measure unwrapping wire: plane control and unwrapping wire: according to existing sideline, the locating point of control point this engineering of pilot measurement providing by the side of exploration, is to guarantee the each stage control point net of construction, coordinate and elevation accurately, first each control in job site is protected.And each control point pilot measurement is protected outside on-the-spot, so that vertical pilot measurement unwrapping wire.To do closed check simultaneously.Before construction, arrange one by electronic tachometer along every 3 meters of the center line of trombone slide on ground, and spread lime line and measured an elevation along the center line of trombone slide, calculate good stake elevation and design trombone slide flowing water relation of plane;
High process control: the vertical control point of the leveling point pilot measurement job site providing according to exploration side, high process control adopts twice instrument elevation front-and rear-view equidistantly to survey method, keep precision, for guaranteeing the correctness of design direction, position, the transmission of guide line is carried out pilot measurement with theodolite, guarantees the accurate of plan-position;
Excavate foundation ditch: every section of traction need to be excavated 2 working pits, comprise entrance working pit, export hole, all adopt machinery to excavate, adopt as required the supporting of close button steel sheet pile, wide × 10m length that first job hole excavation is of a size of 3m, second receives hole and 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 while being back to drag, export hole size is identical with entrance working pit with method of construction, for guaranteeing working pit inner drying and reaming construction, establish (4m wide × 1.5m length × 1.5m is dark) mud-settling pit in working pit southern side, and at any time unnecessary mud is extracted out outside hole establishing slurry pump at the bottom of pond, working procedure is: beat the steel sheet pile supporting → remaining mud → working pit of cutting the earth → clear and enclose and cover, manually the process of dredging notes not damaging the underground utility on walk,
Rig creeps into: rig is transported to on-the-spot must first anchoring stablizing, if rig anchoring shakiness power loss or power will occur and acts on it machine, causes machine and people's injury.Rig is to rely on ground anchor base and rear support and ground fixing, and laying before rig should first smooth location, adjusts according to the rig angle of inclination of design in advance, relies on rig power that anchor pole is squeezed in soil, and rear support and front base anchor and formation consolidation are stablized.
After rig is in place, adjust rig guide rod to the position a little more than design Guan Wei center elevation, level pierces in soil.Transmitter is installed in starter, by geoceiver, record drill bit the degree of depth, duckbilled plate towards angle, the parameter such as zenithal angle of hole, temperature of diamond bit and battery condition, will record parameter and drilling track to contrast, to correct in time.Geoceiver has demonstration and emission function, and information wireless at the bottom of the hole receiving is sent to the receiver of rig and shows, 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 adjusting records of values in " creeping into position " corresponding form.In order to guarantee that the instruction that guide head can send in strict accordance with operator advances, need to after tentatively layouting, pipe-line be encrypted refinement to control point.Interval 3m establishes center line, vertical control point, makes distinguishing mark with timber, and build out fender pier protected with concrete around stake point.Control personnel, in strict accordance with a position, handle instrument.In the process that tubing pulls in hole, be subject to the effect of gravity, pipeline sinkage can occur.What therefore guiding was crept into creeps 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 badly played extremely crucial effect for the success or failure of pipe in pipe pulling construction.Bore liquid and there is cooling drill bit, lubricated drilling tool, the more important thing is and can suspend and carry drilling cuttings, make mixed drilling cuttings become mobile mud successfully outside tap hole, both provided enough annular spaces for returning hauling pipe line, can reduce back again weight and the resistance of hauling pipe line.Remain in the effect that mud in hole can play retaining wall.For improving mud property, sometimes to add appropriate chemical treatments.Caustic soda (or soda ash) can tackify, increase gel strength, regulate pH value, drops into caustic soda amount and is generally 2% of bentonite clay amount.Mud configuration adopts: bentonite clay (import): 35% ~ 45%, drigpae (import) 1% ~ 2%, and caustic soda: 0.5% ~ 0.8%, water: 65% ~ 55%.
Adopt the guided radar control that precision is 0.1% to creep into absolute altitude, guiding absolute altitude is controlled at tube hub line position, and 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 roller bit not, just can make drill bit creep into by the inclination section designing
Inclination section distance L:
L＝[h(2R
1-h)]
0.5
Drilling rod reference angle a:
a＝0.5tg
-1{[h(2R
1-h)]
0.5/h}
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, due to state-of-the-art detection instrument being installed in bit location, in drilling process, by the accurate instrument that receives in ground, adjust angle of drill bit by receiving instrument data, make to creep into according to production line absolute altitude route and advance.Arrival export hole, 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 whether off-design track of monitoring drill bit.At inclination section, drill bit often creeps into 10cm just surveys the position of a drill bit, and in tiled segments, every 20cm, just monitoring is once.If discovery offset track, just, by adjusting the direction on drill bit inclined-plane, rectifies a deviation.But correction can not be too anxious, because drilling rod has certain rigidity after all.Should in several drilling rods, complete correction, can not in a drilling rod, complete correction, also will note not rectifying a deviation excessively simultaneously.
The reaming of pulling back: control drill bit and walk around the through destination of underground obstacle according to predetermined direction, then the den bohrkopf abbauen backhaul amplifier of appropriate size and specific type that changes the outfit, enable, in retracting drilling rod, boring is extended to required diameter, adopt several times hole enlargement, reaming is for the first time 300mm, reaming is for the second time 500mm, so analogizes, and reaming is to 1.5 times of caliber; In the reaming of pulling back when traction,, mud effect particular importance, lacks mud and can cause the contingencies such as collapse hole in hole, guiding is crept into ineffective and for again creeping into and hide some dangers for.Consider that stratum mud more easily misses, after lose returns, lack mud in hole, the frictional force between drilling rod and pipeline and hole wall increases, and causes pulling force to increase.Therefore to remain in whole drilling process and have " returning slurry ", and adjust in time and bore the different mud of liquid proportioning to produce according to the variation of geological condition.
Pipeline welding: the quality of pipe joint quality directly has influence on the success of pipe in pipe pulling construction and carries out, pipeline welding adopts electric smelting connection to be connected with hot melt, melting connection, two pipeline sections should respectively stretch out the certain free length of jig, check and correction link, make it on same axis, misalignment should not be greater than 10% of wall thickness, and temperature of heating plate suitable (220 ± 10 ℃), in the time that tutorial light is bright, Deng use in 10 minutes, so that whole temperature of heating plate is even;
The 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, after pipe, connecting transfer case takes over, by pipe tieback after active well, unload and expand next time head, transfer case, taking-up residue drilling rod, block block head, carry out the hydrostatic test; Reaming is successfully to after requiring, and returning the operation that will carry out pipeline connection before dragging, binary wall twisting and pipe connected into the pipeline suitable with becoming hole length by hot melt, pipeline is connected with reamer, pull back pipeline is drawn in inlet hole hole, after pipeline draws and leads to, reply invert elevation is carried out duplex measurement.The drill bit that prober is housed is pulled in pipeline with rig, the signal that tester sends according to prober is determined the degree of depth of drill bit, calculates end elevation in pipe after converting.The result drawing and original control track elevation compare, and just obtain each position height variation numerical value.
Pit backfill: after trustship construction completion, carry out backfilling of earthwork, take machinery as main, manually coordinate, back-filling in layers, every layer thickness is 30cm, and tamps, while being backfilling into apart from 0.5 meter, ground, adopt 37 lime earth backfill, the height of backfill and main body pavement of road elevation are identical.
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, has solved existing method of construction and has usually caused 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 during cable duct bank is laid, comprise the following steps:
Measure unwrapping wire: plane control and unwrapping wire: according to existing sideline, the locating point of control point this engineering of pilot measurement providing by the side of exploration, before construction, arrange one by electronic tachometer along every 3 meters of the center line of trombone slide on ground, and spread lime line and measured an elevation along the center line of trombone slide, calculate good stake elevation and design trombone slide flowing water relation of plane;
High process control: the vertical control point of the leveling point pilot measurement job site providing according to exploration side, high process control adopts twice instrument elevation front-and rear-view equidistantly to survey method, keep precision, for guaranteeing the correctness of design direction, position, the transmission of guide line is carried out pilot measurement with theodolite, guarantees the accurate of plan-position;
Excavate foundation ditch: every section of traction need to be excavated 2 working pits, comprise entrance working pit, export hole, all adopt machinery to excavate, adopt as required the supporting of close button steel sheet pile, wide × 10m length that first job hole excavation is of a size of 3m, second receives hole and 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 while being back to drag, export hole size is identical with entrance working pit with method of construction, for guaranteeing working pit inner drying and reaming construction, establish (4m wide × 1.5m length × 1.5m is dark) mud-settling pit in working pit southern side, and at any time unnecessary mud is extracted out outside hole establishing slurry pump at the bottom of pond, 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 of 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 location: according to axial line control point, with theodolite location, basis will be avoided in its position, pore-forming: want smooth after rig is in place 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 dislocation, cause leakage mud, well-flushing: after well casing is installed, the rubble filter layer of filling 3-8mm in time between well casing and hole wall, rubble impurity content is not more than 3%; Use spade blanking, prevent that layering is inhomogeneous and impact well casing, fill out filtrate and once complete.Fill out well head 1m left and right the end of from, top adopts the not clay envelope containing sandstone.Then clean filter well, rinse sediment.Cleaning filter well should carry out in bod 8h, in order to avoid overlong time, retaining wall mud skin is aging, is difficult to destroy impact infiltration effect.Draw water: after well-flushing 12-24h, reserve clear water, now get final product continuous pumpage.If more muddy, silt content is large, should search reason.Well casing sealing: well casing is enclosed in not to be needed to continue to carry out after precipitation, tamps with C20 concrete in 2m well casing under bed course when sealing, in order to strengthen the waterproofing effect at construction gap place, water treatment on two pass for sidewall of the bottom plate place.
Rig creeps into: it is stable that rig is transported to on-the-spot first anchoring, rig is to rely on ground anchor base and rear support and ground fixing, laying before rig should first smooth location, according in advance design rig angle of inclination adjust, rely on rig power that anchor pole is squeezed in soil, make rear support and front base anchor and formation consolidation stable, adopt the guided radar control that precision is 0.1% to creep into absolute altitude, guiding absolute altitude is controlled 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 roller bit not, just can make drill bit creep into by the inclination section of design,
Inclination section distance L:
L＝[h(2R
1-h)]
0.5
Drilling rod reference angle a:
a＝0.5tg
-1{[h(2R
1-h)]
0.5/h}
In formula: h-buried depth, R
1-inclination section radius of curvature, gets 1200d, and substitution data 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; can drive the drilling rod that wedge drill bit is housed to pierce from ground according to pre-designed traction circuit; ground instrument receives the information of being sent by conveyer in subterranean drill bit; control drill bit and walk around the through destination of underground obstacle according to predetermined direction; then the den bohrkopf abbauen backhaul amplifier of appropriate size and specific type that changes the outfit; enable, in retracting drilling rod, boring is extended to required diameter, and the pipeline that needs are mated formation while return is led go back to boring ingress.In whole work, the boring mixed solution that mixing especially unit provides constantly sprays from the brill mouth mouth of drill bit, and in order to lubricated drill bit, drilling rod and reinforcing drilled passage, to improve the working efficiency of whole engineering.
Whether the power supply of the surveying instrument of inspection rig is sufficient, not enough replacing battery, particularly popping one's head in 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 are connected on drilling rod, drill-in fluid is carried in start, 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, rig is in place wants strict centering, guarantee rig steadily, horizontal drilling.Before spudding in, will conscientiously check drilling rod, find bending want timely straightening or replacing, rate of penetration is unsuitable too fast, should rationally set up the power that feeds according to formation condition.Determine rate of penetration according to Seines types, should not exceed 3m/min at fluffing of moulding sand layer, in hard stratum, rate of penetration is not beated and is advisable with rig.And running check bit wear degree, find serious wear, carry out in time Welding Repair, when deflecting jacking, each jacking drilling depth is controlled at 0.5m left and right for well, curve will delay, in drilling rod, must not enter foreign material, in order to avoid obstruction bit nozzle, in the time that engine oil pressure alarm indicator lamp is bright, illustrate that oil pressure is undesired, check, in the time that machine oil obstruction alarm indicator lamp is bright, change machine oil filtering element (cartridge), while changing Pump output, first declutch, must not belt speed gear shift, when in idle situation of water pump long period, its gearbox should be hung to neutral, after the clutch that closes, to keep the release bearing in clutch operating system, start after rig by standard, do not allow to creep into by full load at once, must first carry out running in, after determining that each several part works well, can start to creep into.
The reaming of pulling back: control drill bit and walk around the through destination of underground obstacle according to predetermined direction, then the den bohrkopf abbauen backhaul amplifier of appropriate size and specific type that changes the outfit, enable, in retracting drilling rod, boring is extended to required diameter, adopt several times hole enlargement, reaming is for the first time 300mm, reaming is for the second time 500mm, so analogizes, and 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, when connection, logical electrically heated voltage meets with the time regulation that electric smelting is connected facility and electric melting pipe fittings, electric smelting connection cool time, must not mobile link part or link on must not apply any external force, electric smelting socket joint connects tubing connecting end and should cut vertically, junction surface should clean totally, and should show insertion depth, scrapes off surperficial oxide layer.Before connection, corresponding link, make it on same axis, main connection part lower end should adopt support, and fixed anastomosis, when pipeline connects, when job site conditions permit, can on groove, weld, after welding, check in peephole whether jack-up of material, 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, hot melt connects applying clean cotton without dirt and clean on forward and backward fastening means heating surface, hot melt connects the regulation that heating time and heating-up temperature should meet hot melt fastening means factory and tubing, pipe fitting factory, hot melt connects pressurize cool time, must not mobile link part or link on 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, in the time forming continuous cutting, exit jig, check the gap (must not be greater than 3mm) at pipe two ends.Electric smelting junction surface should clean totally, scrapes just surface skin, melting connection, two pipeline sections should respectively stretch out the certain free length of jig, and check and correction link, makes it on same axis, misalignment should not be greater than 10% of wall thickness, suitable 230 ℃ of temperature of heating plate, in the time that tutorial light is bright, is preferably in etc. 10 minutes and uses, so that whole temperature of heating plate is even, the heating plate that temperature is suitable is placed in frame, closed jig, and the pressure of the system of setting up departments.Reach after the heat absorption time, open rapidly jig, take off heating plate.Should avoid bumping 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.Reach after cool time, press one time cool time button, pressure is reduced to zero, open jig, take off the pipe welding, unloading before pipe must be by Pressure Drop most zero, if mobile welding machine, should pull down hydraulic hose, 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 job site conditions permit, can on groove, weld, the mouth of pipe should block temporarily.Under strong wind atmosphere, operate, take protective measure or adjust construction process.
The 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, after pipe, connecting transfer case takes over, by pipe tieback after active well, unload and expand next time head, transfer case, taking-up residue drilling rod, block block head, carry out the hydrostatic test; Reaming is successfully to after requiring, and returning the operation that will carry out pipeline connection before dragging, binary wall twisting and pipe connected into the pipeline suitable with becoming hole length by hot melt, and pipeline is connected with reamer, pulls back 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 is in strict accordance with plan-position and the high process control drill bit trend of ground pre-cloth control stake, every 3 meters of checks of horizontal equivalent once.
Pit backfill: after trustship construction completion, carry out backfilling of earthwork, take machinery as main, manually coordinate, back-filling in layers, every layer thickness is 30cm, and tamps, while being backfilling into apart from 0.5 meter, ground, adopt 37 lime earth backfill, the height of backfill and main body pavement of road elevation are identical.
Cross the river or to cross section soil property poor according to excavation situation, adopt to beat and pull out steel sheet pile supporting measure, load and unload steel sheet pile and should adopt hang at 2.When handling, the steel sheet pile radical of each lifting is too much unsuitable, and attention protection fore shaft is avoided damage.Steel sheet pile should be deposited on smooth and firm place, if desired place foundation soil is carried out to compaction treatment.In the time stacking, to note: order, position, direction and the layout etc. of stacking should be taken into account later easy construction; Steel sheet pile will be stacked respectively by model, specification, length, construction part, and in stacking place, label explanation is set; Steel sheet pile should be stacked respectively, stacks quantity for every layer and is generally no more than 5, and each interlayer is wanted bolster wood, and chock spacing is generally 3～4m, and upper and lower layer chock should be on same vertical line, and the total height of stacking should not exceed 2m.
Single pile is squeezed into method take one or two block plates as one group, and since one jiao of block-by-block inserted to play, until engineering finishes, this method easy construction of squeezing into, can beat without a break, and stake machine track route is short, and speed is fast.First with crane, steel sheet pile is winched to and inserts some place and carry out pitching pile, when pitching pile, fore shaft will be aimed at, and one of every insertion puts pile cover, gently in addition hammering; In piling process, be to guarantee the perpendicularity of steel sheet pile, controlled at both direction with theodolite; For preventing the displacement of fore shaft center line plane, can establish clamp at the steel sheet pile fore shaft place of piling travel direction, stop sheet pile displacement.Enclosing the position that calculates in advance every block of sheet pile on purlin, to check and proofread and correct at any time simultaneously.
Foundation ditch inner side arranges altogether 2 layers from top to bottom and encloses purlin and inner support and angle brace, encloses purlin and adopts hot rolling wide width wing edge 30H shaped steel, and inner support and angle brace adopt Φ 273 seamless steel pipes, wall thickness 10mm.
Hoist should the loading gradually with the starting of vibration hammer, and lifting force is generally slightly less than the compression limit of damper spring; Should be 1.2～2.0 times of the specified acc power of the own motor of vibration hammer for the power supply of vibration hammer; The steel sheet pile larger to pulling resistance, the method for employing intermittent control shaking is vibrated 15min at every turn, and vibration hammer continuous operation is no more than 1.5h.
The native hole processing of backfill in time that steel sheet pile stays after pulling out, particularly there is the occasion of building, structure or underground utility around, especially should note timely backfill, otherwise tend to cause surrounding soil displacement and sedimentation, and cause thus the destruction of Nearby Structure etc.
Pit retaining monitoring, comprises the Horizontal displacement of supporting construction, distortion, level of ground water, stake internal force, axial force of the supports, the soil body layering displacement etc. of underground pipelines peripherally.Sedimentation, inclination and horizontal displacement observation point should be set in each corner, foundation ditch top; Supporting sheet pile, the stress that supports, encloses 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 be established four observation holes in foundation ditch surrounding.Foundation ditch bottom resilience and protuberance observation are looked field condition and are determined.
Monitoring and the control index of testing, supporting Horizontal Displacement accumulative total is not more than 30mm, and rate of displacement is not more than 3mm/d; Pile body, the stress value that encloses 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 be lower than design objective.
In the time going along with sb. to guard him construction, under normal circumstances, close on monitoring target observation in every 2 days 1 time, in the time of daily variation or the super warning value of accumulative total variable quantity, monitoring frequency is suitably encrypted, and observes every day 1 time.Special circumstances are abnormal or sudden change as Monitoring Data has, and rate of change is bigger than normal etc., and suitably infill monitoring frequency, until tracking and monitoring.In the Underground Construction stage, each monitoring project observing frequency is 2～3 times/week, and in 1 times/day of supporting removal stage, 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 establishing the foundation ditch of inner support, in every layer of soil excavation, the part of excavation simultaneously, in position and the degree of depth, keep symmetrical, prevents that 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.Excavation of foundation pit, after designed elevation, must dig the mud of support pile root clearly, otherwise can cause support pile to collapse.Foundation ditch bottom surface is can not open-assembly time long.Long between intermittence in the middle of excavation of foundation pit, distortion meeting is along with the time constantly increases.In this case, should consider to increase the intensity of supporting construction.Note the tau-effect of foundation ditch: the ageing problem of excavation slope is obvious, and rainy season is more remarkable.By taking into full account the creep properties of soil layer, complete as early as possible Underground Construction.
Utilize this construction process, make the short construction period of trustship, and construction quality is stable, trustship is difficult for breaking, and can guarantee the laying quality of cable duct bank, increases the service life.
The above; it is only preferred embodiment of the present invention; not the present invention is done to any pro forma restriction, any simple modification, equivalent variations that every foundation technology of the present invention, method are done above embodiment in fact, within all falling into protection scope of the present invention.
Claims (1)
1. the trustship construction process based on during cable duct bank is laid, is characterized in that, comprises the following steps:
(a), measure unwrapping wire: (1), plane control and unwrapping wire: according to existing sideline, by the locating point of control point this engineering of pilot measurement of precognition, before construction, arrange one by electronic tachometer along every 3 meters of the center line of trombone slide on ground, and spread lime line and measured an elevation along the center line of trombone slide, calculate good 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 elevation front-and rear-view equidistantly to survey method, keep precision, for guaranteeing the correctness of design direction, position, the transmission of guide line is carried out pilot measurement with theodolite, guarantees the accurate of plan-position;
(b), excavate foundation ditch: every section of traction need to be excavated 2 working pits, comprise entrance working pit, export hole, all adopt machinery to excavate, adopt as required the supporting of close button steel sheet pile, wide × 10m length that first job hole excavation is of a size of 3m, second receives hole and 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 while being back to drag, export hole size is identical with entrance working pit with method of construction, for guaranteeing working pit inner drying and reaming construction, establish (4m wide × 1.5m length × 1.5m is dark) mud-settling pit in working pit southern side, and at any time unnecessary mud is extracted out outside hole establishing slurry pump at the bottom of pond,
(c), rig creeps into: it is stable that rig is transported to on-the-spot first anchoring, rig is to rely on ground anchor base and rear support and ground fixing, laying before rig should first smooth location, adjust according to the rig angle of inclination of design in advance, rely on rig power that anchor pole is squeezed in soil, make rear support and front base anchor and formation consolidation stable, adopt the guided radar control that precision is 0.1% to creep into absolute altitude, guiding absolute altitude is controlled 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 roller bit not, just can make drill bit creep into by the inclination section of design,
Inclination section distance L:
L＝[h(2R
1-h)]
0.5
Drilling rod reference angle a:
a＝0.5tg
-1{[h(2R
1-h)]
0.5/h}
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), the reaming of pulling back: control drill bit and walk around the through destination of underground obstacle according to predetermined direction, then the den bohrkopf abbauen backhaul amplifier of appropriate size and specific type that changes the outfit, enable, in retracting drilling rod, boring is extended to required diameter, adopt several times hole enlargement, reaming is for the first time 300mm, reaming is for the second time 500mm, so analogizes, and reaming is to 1.5 times of caliber;
(e), pipeline welding: pipeline welding adopts electric smelting connection to be connected with hot melt, melting connection, two pipeline sections should respectively stretch out the certain free length of jig, check and correction link, makes it on same axis, and misalignment should not be greater than 10% of wall thickness, temperature of heating plate suitable (220 ± 10 ℃), in the time that tutorial light is bright, wait use in 10 minutes, so that whole temperature of heating plate is even;
(f), the 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, after pipe, connecting transfer case takes over, by pipe tieback after active well, unload and expand next time head, transfer case, taking-up residue drilling rod, block block head, carry out the hydrostatic test; Reaming is successfully to after requiring, and returning the operation that will carry out pipeline connection before dragging, binary wall twisting and pipe connected into the pipeline suitable with becoming hole length by hot melt, and pipeline is connected with reamer, pulls back pipeline is drawn in inlet hole hole;
(g), pit backfill: after trustship construction completion, carry out backfilling of earthwork, take machinery as main, manually coordinate, back-filling in layers, every layer thickness is 30cm, and tamps, while being backfilling into apart from 0.5 meter, ground, adopt 37 lime earth backfill, the height of backfill and main body pavement of road elevation are identical.
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| CN105298502A (en) * | 2015-11-30 | 2016-02-03 | 浙江省第一水电建设集团股份有限公司 | Construction method for blasting excavation of rock tunnel wall large diameter pipeline |
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| CN112815965A (en) * | 2021-01-14 | 2021-05-18 | 交通运输部天津水运工程科学研究所 | Verticality and vertex angle measurement and calibration device and method for movable mechanical pore-forming detector |
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| CN113026905A (en) * | 2021-03-15 | 2021-06-25 | 中铁城建集团第三工程有限公司 | Supporting pipe construction method for drainage casing engineering |
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| CN117514128A (en) * | 2024-01-08 | 2024-02-06 | 山西郎腾信息科技有限公司 | Underground coal mine horizontal directional intelligent drilling control method |
| CN117514128B (en) * | 2024-01-08 | 2024-03-19 | 山西郎腾信息科技有限公司 | Underground coal mine horizontal directional intelligent drilling control method |
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