CN105822830A - In-situ suspension protection construction method of high-pressure gas pipe longitudinally spanning over foundation pit - Google Patents
In-situ suspension protection construction method of high-pressure gas pipe longitudinally spanning over foundation pit Download PDFInfo
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- CN105822830A CN105822830A CN201610197706.0A CN201610197706A CN105822830A CN 105822830 A CN105822830 A CN 105822830A CN 201610197706 A CN201610197706 A CN 201610197706A CN 105822830 A CN105822830 A CN 105822830A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
- F16L1/11—Accessories therefor, e.g. anchors for the detection or protection of pipes in the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
- F16L3/16—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets with special provision allowing movement of the pipe
- F16L3/20—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets with special provision allowing movement of the pipe allowing movement in transverse direction
- F16L3/205—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets with special provision allowing movement of the pipe allowing movement in transverse direction having supporting springs
- F16L3/21—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets with special provision allowing movement of the pipe allowing movement in transverse direction having supporting springs providing constant supporting spring force
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses an in-situ suspension protection construction method of a high-pressure gas pipe longitudinally spanning over a foundation pit, and aims to provide the in-situ suspension protection construction method of the high-pressure gas pipe longitudinally spanning over the foundation pit with high safety and low construction cost. The construction method comprises the steps of: (1) construction of an electrode protection device; (2) construction of a main support system; (3) construction of a suspension system; (4) construction of a pipe protection system; (5) construction of a full-automatic monitoring system; and (6) pipe restoration. The construction method performs in-situ protection for an ultralong high-pressure gas pipe, longitudinally spanning over the foundation pit, incapable of being changed or a pipe with higher change difficulty, so that the gas pipe is safely and stably operated in the construction process of the foundation pit, the inconvenience for surrounding life and the construction risk caused by change of the high-pressure gas pipe can be prevented, and the metro construction time can be shortened to smoothly finish the construction target.
Description
Technical field
The present invention relates to technical field of municipal construction, especially relate to a kind of high-pressure gas Guan Zong construction method across foundation ditch suspension protection in situ.
Background technology
In recent years along with the fast development in city since, Construction of Urban Rail Traffic is the most like a raging fire, is difficult to avoid clashing with original urban operating mechanism (road, pipeline) in work progress.Particularly sub-high pressure and high-pressure gas pipeline can bury serious potential safety hazard to construction.
The relatively common method of protection of traditional pipeline has to change moves and in-situ conservation.Change and move and the construction technology comparative maturity of general pipeline in-situ conservation.But typically take said method just for the foundation ditch less in span, the dangerous little situation of pipeline self.For not moving change vertical across foundation ditch speciality during subway work, high-pressure gas pipeline is not correlated with in-situ conservation case, if taking improper measure that pressure piping is carried out in-situ conservation cause pipe explosion, can produce the most serious consequence.
Therefore, it is badly in need of a kind of for running into the vertical construction method taking in-situ conservation across foundation ditch speciality, high-pressure gas pipeline during subway work, thus solves this technical barrier.
Summary of the invention
Instant invention overcomes shortcoming of the prior art, it is provided that a kind of highly reliable, the high-pressure gas Guan Zong that safety is high and construction cost is low is across the construction method of foundation ditch suspension protection in situ.
In order to solve above-mentioned technical problem, the present invention is achieved by the following technical solutions:
A kind of high-pressure gas Guan Zong is across the construction method of foundation ditch suspension protection in situ, it is characterised in that comprise the following steps:
(1) electrode protecting device construction；
(2) main support system construction；
(3) suspention system construction；
(4) pipeline protection system construction；
(5) construction of auto monitoring and measurement system；
(6) pipeline reduction.
Preferably; the construction of described electrode protecting device is as follows: electrode protecting device is located at the two ends of high-pressure gas pipeline (hereinafter referred to as pipeline); protection device one end uses magnalium as anode and to be embedded in underground and be grounded; other end steel plate and pipe bonding, the employing cable between anode and steel plate connects.
Preferably, the construction of described main support system uses form of construction work and/or the form of construction work of lattice column+Bailey beam of concrete beam+Bailey beam.
Preferably, the form of construction work of described concrete beam+Bailey beam includes: the 1. determination of excavating sideline；2. earth excavation at concrete beam；3. side slope protection；4. concrete beam pours；The most whether support door frame is installed；6. the erection of Bailey beam.
Preferably, the form of construction work of described lattice column+Bailey beam includes: using 2 road lattice columns as main support, lattice column top board sets up concrete beam, then installs door frame and Bailey beam.
Preferably, the construction of described suspention system includes: the 1. earth excavation of pipeline；2. Bailey beam is installed and is reinforced；3. selection and the installation of supporting system are suspended in midair.
Preferably, the construction of described pipeline protection system includes: 1. pipeline outsourcing protection；The most automatic temperature-controlled spray system is constructed；3. lightning protection construction；The most sun-proof construction；5. pipeline rigid protection construction.
Preferably, described auto monitoring and measurement system construction includes: 1. deep soils system construction；2. CCD coordinatograph construction；3. low-consumption wireless data collection station construction.
Preferably; the reduction construction of described pipeline includes: after correspondent section caving plate casting complete; concrete post is made as pipeline support post in Roof, pipeline bottom application; the every 6m of support column is together; each support column in suspension protection applied and reach intensity 75% after, the most dismountable should across suspension protective device, be then backfilled to former road surface; recovering functional performance, pipe line suspension protection operation terminates.
Compared with prior art, present invention have the advantage that
(1) the present invention is directed to move the vertical speciality high-pressure gas pipeline across foundation ditch changed; or move and change the pipeline that difficulty is bigger; by speciality high-pressure gas pipeline is carried out in-situ conservation; make gas pipeline operation of safety and steady during foundation pit construction; can either evade high-pressure gas pipeline move change in the surrounding inconvenience that brings of life and construction safety risk, the subway work time can be shortened again thus smoothly complete construction target.
(2) present invention uses electrode protecting device that the pipeline that pipe age is longer is carried out anti-corrosion protection, it is to avoid pipeline the most too fast exposed oxidation produces the risk of tube wall corrosion, improves the safety of pipeline self.
(3) present invention uses constant force spring hanging frame, it is to avoid the security risk that speciality pipeline brings due to temperature deformation；Use temperature control spray system, it is to avoid the security risk that gas pipeline produces due to temperature deformation；Use auto monitoring and measurement system (gas leakage automatic monitoring system; CCD automatic monitoring system), the high-pressure gas pipeline of suspention is carried out omnibearing dynamic monitoring, is analyzed its Monitoring Data processing; then suspension protective device is adjusted, it is ensured that the safety of gas pipeline.
Detailed description of the invention
Below the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not paying creative work premise, broadly fall into the scope of protection of the invention.
A kind of high-pressure gas Guan Zong, across the construction method of foundation ditch suspension protection in situ, is embodied as step as follows:
(1) electrode protecting device construction
Electrode protecting device is the principle utilizing galvanic element; prevent metal erosion; using metal strong for reproducibility as protection pole; the composition that is connected with protected metal galvanic element; the metal that reproducibility is strong will sacrifice consumption as negative pole generation redox reaction; protected metal, as positive pole, avoids being corroded.
Electrode protecting device is located at high-pressure gas pipeline (hereinafter referred to as pipeline) two ends, and protection device one end uses magnalium as anode and to be embedded in underground and be grounded, and other end steel plate and pipe bonding, the employing cable between anode and steel plate connects.
Grounded part: carry out buried depth by road, uses level fluting method construction, and the anode depth of burying is not less than 1m, and pipeline is often held and arranged 2 pieces of magnaliums, spacing 3m.When burying anode underground, note should not having between anode and pipeline metal structures.
With piping connection portion:
After sacrificial anode is connected by cable and Plate Welding by cable and pipeline, then boning with pipeline, cable is as follows with the connection request of gas pipeline:
1. after cable is first connected firmly with steel plate soldering, then the conducting resinl bonding of steel plate and pipeline enclosure is carried out.Conducting resinl is smeared should be uniform, will cover bare metal face comprehensively.Should be removed by pipeline anticorrosion coating before bonding, edge is cut into groove shape, and slope angle is less than 30 degree.Desire weld is made to expose the metal polish surface of enough sizes with electronic tools for cleaning rust；Cut cable should remove insulating barrier, and heart yearn should stretch out 50mm, and cable must clean, and is dried, oil-free and without oils and fats.
2. should carry out fastness test after conducting resinl is fully cured, qualified after can carry out sealing corrosion process.First the foreign material of clean abutting edge are removed, viscoelastic body antiseptic plaster is used to be filled with at deficiency of protection coating, then 300mm width viscoelastic body anticorrosion belt is used to subsidize, should ensure that viscoelastic body anticorrosion belt and mend injury main body anticorrosive coat overlap joint no less than 100mm, attaching should be tight, uses polyethylene adhesive tape outer cladding the most again.Should first fill PUR, then outer cladding polyethylene adhesive tape when benefit is hindered, former anticorrosive coat should hacking in advance.
3. cable is bonding complete after, allowance (10% stretch allowance) all should be stopped in ground and underground, in case breaking cable during soil shrinkage, lay and appropriate to the occasion be attached to tube wall top, every 5m sealing tape with pipeline colligation once, measuring, point is other should become a big bowknot by cable laying, and is fixed on pipe with sealing tape, to alleviate pulling force.
4. cable adhesive spots position should not be on elbow or in the 200mm scope of pipe welding seam both sides.
(2) main support system construction
1) concrete beam+Bailey beam
Physical characteristic and foundation ditch width design according to being suspended pipeline go out rational concrete support crossbeam, are often advisable at about 30m across concrete beam span.In work progress as follows:
1. the determination of excavating sideline: carry out the setting-out of concrete beam position according to construction drawing, marks concrete beam axis on ground, puts the slope gradient according to absolute altitude and excavation at the bottom of ground elevation and concrete beam and determines excavation bench crest, and obvious by white lime mark.
2. earth excavation at concrete beam: earth excavation uses excavator layering to carry out, every cutting depth reaches about 2m and carries out a pneumatically placed concrete protection, soil excavation in tube circumference 5m uses mechanical engagement manually to carry out, the soil body in tube circumference 1m all uses hand excavation, digging process is used hand-held combustion gas survey meter to carry out gas leakage detection by security official, must stop construction immediately as being found to have gas leak phenomenon, after asking combustion gas unit to confirm and adopt an effective measure, construction continues excavation；In digging process, it is necessary to strictly control digging mode, it is ensured that pipe safety and do not destroy anticorrosive coat, along with excavation progress carries out the retention (mainly pipe deforming situation, anticorrosive coat situation, tube circumference situation etc.) of present situation pipeline image data.
After a segment pipe pipe top earth excavation completes, carry out this segment pipe coordinate and the collection of elevation initial value immediately, be analyzed for monitoring the Monitoring Data of system below, digging process finds when anticorrosive coat present situation is poor, it is proposed that increase the detection of pipeline wall thickness.
3. side slope protection: determine according to different geological conditions and put the slope gradient, typically putting the slope gradient is 1:0.5, such as rainy season construction, it is proposed that spray 5cm thickness C25 concrete on side slope surface, to guarantee stability of slope.
4. concrete beam pours: must apply bed course before concrete beam reinforcing bar binding, bed course thickness 5cm, in the middle part of in case of, amount of deflection is excessive can will arrange pre-arch in the middle part of crossbeam, camber is not less than L/300, concrete beam should pour in the lump with this position Guan Liang, it is ensured that concrete beam and the globality of Guan Liang.During concrete support reinforcement construction, ground anchor bolt is set according to top door frame or Bailey beam position, in order to be connected the adjustment that can carry out spacing according to field condition with Bailey beam.Casting process notably vibrates, after casting complete, notes receipts face, cover watering maintenance after concrete final set no less than 7 days.
The most whether support door frame be installed: due to pipeline at underground buried depth not on same elevation, but concrete stull is on same elevation, for ensure Bailey beam to move towards the gradient consistent with pipeline, pipe is placed in Bailey beam, the support door frame installing differing heights at per pass concrete stull top can be used, then Bailey beam is placed in above door frame, it is ensured that Bailey beam and pipeline to move towards the gradient consistent.
Door frame column is I25 I-steel, and crossbeam is I20a I-steel (shaped steel can be able to adjust according to practical situation), and concrete beam roof door frame is double column door frames, broad position door frame, it is set to three column door frames, between column, uses I25a I-steel, I20a I-steel angle brace to reinforce.Door frame uses M20 ground anchor bolt to be connected with concrete beam, 4 ground anchor bolts of each column.
6. the erection of Bailey beam: Bailey beam is marched into the arena assembled nearby after passed examination, starts Bailey beam unit at one concrete beam to be spliced to down, at one concrete beam, carry out assembly according to special service manual between beret truss unit.
2) lattice column+Bailey beam
As run into the situation that foundation ditch is wider, use concrete beam cross section bigger and uneconomical time, 2 road lattice columns can be used as main support, lattice column top board sets up concrete beam, then installs door frame and Bailey beam.
According to related specifications, it is proposed that both sides lattice column spacing is 6m, unilateral from pipeline center 3m, in order in the work progress of lattice column, to ensure the safety (construction vibrations) of pipeline.Below concrete beam and door frame, Bailey beam construction according to above-mentioned 1) mode is carried out described in concrete beam+Bailey beam.
(3) suspention system construction
Often across main support system formed after suspend in midair immediately system construction, specific as follows:
1. the earth excavation of pipeline: digging process notes reducing soil disturbance, excavation one is across suspention one across, it is ensured that pipe safety, and excavation uses mechanical engagement manually to carry out.
2. Bailey beam is installed and is reinforced: Bailey beam should install reinforcing I-steel after installing immediately, selects suitable Two bors d's oeuveres channel-section steel, per pass suspention case bay to be proposed with 6m, reinforce and use I-steel according to pipeline character suspention beam, and spacing is proposed with 6m.
Suspention beam fixes the steel plate after using 10mm with Bailey beam, depending on size is according to practical situation, and reserved two elongated holes on steel plate, the aperture ratio diameter of bolt is slightly larger, 35mm at hole, to avoid because mismachining tolerance causes scene to install, must increase packing ring in installation process.Steel plate and channel-section steel full weld, weld seam height is not less than 6mm.
Reinforce I-steel to be added with Bailey beam by bolt and be solidly connected, drill through two holes at I-steel and fix so that bolt passes；
3. suspend selection and the installation of supporting system in midair: in order to avoid difference variation is excessive, when using fixed support, produce additional stress disadvantageous to pipeline, therefore select constant force spring hanging frame as the support of pipeline suspension.
The principle of constant force spring hanging frame is that loading moment and spring torque remain balance under the load displacement of license.To the pipeline supported with constant force spring hanging frame, when being subjected to displacement, it is provided that constant supporting force, without bringing additional stress to pipeline, it is ensured that the safety of pipeline.
The information such as physical property according to pipeline self, peripheral temperature change are by by " constant-force spring hanger " (JB/T8130.1-1999) requirement suitable spring constant hanger model of employing.Rule of thumb, the shift value of suspension bracket controls within 150mm.
Constant force spring hanging frame is placed in Two bors d's oeuveres channel-section steel suspention back.In installation process, measure the accurate location placing spring hanger, weld with channel-section steel overlap joint periphery again after U-bolt need to being used fixing connecting plate afterbody bolt hole.Welding process must be noted that the protection that gas leakage detection and welding slag drop.
Produce spark for avoiding construction tool to collide with Bailey beam, channel-section steel, I-steel etc. in installation process, copper instrument (such as copper spanner) and rubber instrument (such as rubber hammer) need to be used.
Under Bailey beam earth excavation one across, it is necessary to set up one across Bailey beam, install one across suspension system, it then follows excavation one across protection one across principle.
(4) pipeline protection system construction
1. pipeline outsourcing protection: the rock silk floss heat-insulation layer that uses thickness to be 50mm immediately after pipeline earth excavation completes, thickness are that the rubber slab of 10mm carries out parcel protection, excavation one across protection one across；Play anti-collision, sun-proof, fireproof function.
The most automatic temperature-controlled spray system is constructed: lay a diameter of high-pressure water pipe of 20 millimeters above pipeline, every mono-water sprayering hole of 3m on water pipe, automatic temperature-adjusting and smoke sensing device are installed between Bailey beam, spray system can be automatically opened up when temperature is more than 25 degrees Celsius to lower the temperature, reduce pipeline external temperature and maintain about 25 degree, it is also possible to fire prevention.
Automatic temperature-controlled spray system is by temperature sensor, temperature switch forms, temperature switch controls high-pressure water pipe, after temperature exceedes and arranges the upper limit, temperature switch automatically can be opened water valve and supply water in pipeline ejection water smoke, so that external temperature reduces less than temperature upper limit, temperature sensor arranges one every 10m, ensure that each regional temperature controls a level, eliminate because of pipeline self because temperature is different, and produce stress disadvantageous to pipeline.
3. lightning protection construction: direct lightning strike protection utilizes main reinforcement, metal Bailey beam and the I-steel cross-beam body in reinforced concrete beams door frame as arrester and downlead；Grounding device uses natural grounding substance, the bar-mat reinforcement in utilizing the main reinforcement in reinforced concrete beams door frame and welding the subway fender pile basis all around of connection with it, and electrical grounding line uses Hot-dip zinc-coated flat steel sheet, impulse earthed resistance R≤10 Ω.All being connected by overlap welding, round steel weld length is 6 times no less than diameter, and band steel weld length is 2 times not less than band steel width, and no less than three weldings, and forming good electric path, weld makees preservative treatment.
The most sun-proof construction: using at Bailey beam top 50mm × 50mm × 5mm square tube to be welded Junk prevention and clash into skeleton, use iron wire to tighten with Bailey beam, upper covering blue color steel watt prevents the sun directly to shine pipeline, has held concurrently and has prevented junk from dropping foundation ditch effect.
Utilize Bailey beam to fix I-steel at Bailey beam lower boom, longitudinally respectively lay 1 walkway board of can constructing along station in pipeline both sides, to facilitate inspection, monitoring personnel walking, walkway board is installed along Bailey beam direction, uses iron wire colligation firm with reinforcing I-steel, suspention beam.Laying rice grid inside Bailey beam, utilize Bailey beam to double as guardrail, rice grid uses ferrum colligation with Bailey beam.Rice grid overlap joint have to be larger than 2 mesh, and walkway board must use iron wire colligation firm with channel-section steel and I-steel.
5. pipeline rigid protection construction: due to buried depth of pipeline problem, being likely encountered pipeline can not be in Bailey beam, can only suspend in midair to outside, pipeline rigid protection must be used, rigidity protection uses steel pipe to set up into framework shape, top is flattened and is connected with Bailey beam lower boom, and bottom uses rotary buckle and fastener for connection, longitudinal pitch 5m.Being longitudinally arranged 4 steel pipes, bottom bar arranges 2, left and right vertical rod respectively arranges 1, the every long 6m of steel pipe, the employing cruciform fastening for falsework between steel pipe connects, and forbids to connect clasp, falls into foundation ditch with anti-fall.
(5) construction of auto monitoring and measurement system
Installing natural gas leakage autoalarm a set of, gas leakage monitoring probe is located at above pipeline, installs one every 10m, and is connected to total alarm.Autoalarm is located at office of floor manager portion, first debugs after installing, and uses small bottle packing natural gas to be placed on the gas leakage of pipe Imitating during debugging.Its detection content and work progress are as follows:
1) deformation monitoring: Monitoring Pinpelines is brought into Excavation Monitoring project, unifies benchmark, comprehensively analyzes, it is ensured that combustion gas and and foundation ditch overall safety.Main Contents for Monitoring is as follows:
1. axial force of the supports, sedimentation
2. stake top level, vertical displacement, fender post deviational survey
3. pipeline is vertical, horizontal displacement
Sending special messenger to carry out monitoring in 24 hours, every 12h monitors once.
2) monitoring point is arranged and initial value collection: monitoring point carries out the collection of initial value immediately after having arranged, and reports third party monitoring unit to check, the reference value calculated as follow-up monitoring result after determining.Bailey beam and piping displacement and settling amount need to be monitored, two all synchronization implementations, comprehensive analysis, it is arranged according to Bailey beam span, one group of monitoring point, often 3 points of group are often set across termination and span centre position, wherein each 1 of both sides beret truss, 1, pipeline, Monitoring Pinpelines point uses stirrup to be fixed on pipeline, Bailey beam uses round end cross screw bolt as monitoring point.
Auto monitoring and measurement system construction is specific as follows:
1. deep soils system construction
Combined type deep soils system is mainly used in foundation ditch periphery soil body deep different layers Bit Shift condition monitoring, contributes to accurately determining soil mass sliding surface position and deformation tendency thereof.This system is made up of angular displacement sensor and inclination sensor.Angular displacement sensor utilizes inclinometer pipe that the length change produced when substantially tilting occurs, thus records the deep displacement of tipping tube.Angular displacement sensor is mainly used in large displacement measurement, and inclination sensor then can the more tiny inclinometer pipe angle of perception tilt.Automatically inclinometer comprehensively uses servo accelerometer and angle displacement transducer principle, it is achieved Rock And Soil deep different layers position small deformation and large deformation joint observation, and its important technological parameters see table:
2. CCD coordinatograph construction
Five dimensions noncontact system for monitoring displacement (the CCD coordinatograph) are to measure three-D displacement and spatial attitude monitoring instrument.This system is made up of the CCD module being arranged in Bailey beam and the laser range finder module being arranged on stability fundamental.Utilizing the high-precision ranging of laser range finder to obtain a Direction distortion component, the change in location of CCD module recording laser point can get other both direction components simultaneously, thus obtains the 3 D deformation of deformed region monitoring point.CCD plumb line coordinator is made up of CCD device, laser range finder and data acquisition transport module, this equipment is the one contactless automatization displacement observation equipment using CCD device to realize, vertical line X, Y two displacement in direction in CCD screen plane can be measured, distance variable quantity can be recorded in combination with laser distance measuring principle, to sum up this equipment can complete three-D displacement observation, and its important technological parameters see table:
3. low-consumption wireless data collection station construction
The key problem that above-mentioned all kinds of monitoring sensing equipment realizes automatization is to observe data acquisition and remote transmission, this intellectual monitoring scheme realizes this Core Feature based on low-consumption wireless data collection station, this type acquisition station supports that vibratory string, simulation, digital type signals access, and supports GPRS/GSM communication modes.
Piping displacement data can be monitored by auto monitoring and measurement system in real time, in time perseverance is hung on tightener according to the feedback of Monitoring Data and is adjusted, it is ensured that the displacement of pipe line is in span of control.
If the monitoring instrument that can take routine when monitoring device condition does not possesses is monitored: monitoring basic point is embedded in the stability region beyond settlement influence scope；At least two basic point should be buried underground, in order to two basic points are checked mutually；Burying underground of basic point is solid and reliable, and basic point should obtain original elevation with neighbouring bench mark translocation, and basic point should be embedded in the place of broad view, is beneficial to observation.
The project of monitoring mainly according to job specfication and On-the-spot factor comprehensive depending on.For reducing the variations in temperature impact on pipeline, need periodic monitor every day.Suspension system monitoring project and frequency see table:
Vertical displacement and horizontal displacement by monitoring pipe line can be in the hope of the resultant displacements of pipeline: in time perseverance is hung on tightener according to the feedback of Monitoring Data and be adjusted, ensure that the displacement of pipe line, in span of control, monitors project controlling value and early warning value see table:
(6) pipeline reduction construction
For reducing the time span of suspension protection as far as possible; concrete post is made as pipeline support post in Roof, pipeline bottom application after correspondent section caving plate casting complete; the every 6m of support column is together; each support column in suspension protection applied and reach intensity 75% after, the most dismountable should across suspension protective device.Then being backfilled to former road surface, recover functional performance, pipe line suspension protection operation terminates.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (9)
1. a high-pressure gas Guan Zong is across the construction method of foundation ditch suspension protection in situ, it is characterised in that comprise the following steps:
(1) electrode protecting device construction；
(2) main support system construction；
(3) suspention system construction；
(4) pipeline protection system construction；
(5) construction of auto monitoring and measurement system；
(6) pipeline reduction.
The most according to claim 1, high-pressure gas Guan Zong is across the construction method of foundation ditch suspension protection in situ; it is characterized in that: the construction of described electrode protecting device is as follows: electrode protecting device is located at the two ends of high-pressure gas pipeline; protection device one end uses magnalium as anode and to be embedded in underground and be grounded; other end steel plate and pipe bonding, the employing cable between anode and steel plate connects.
The most according to claim 1, high-pressure gas Guan Zong is across the construction method of foundation ditch suspension protection in situ, it is characterised in that: the construction of described main support system uses form of construction work and/or the form of construction work of lattice column+Bailey beam of concrete beam+Bailey beam.
The most according to claim 3, high-pressure gas Guan Zong is across the construction method of foundation ditch suspension protection in situ, it is characterised in that: the form of construction work of described concrete beam+Bailey beam includes: the 1. determination of excavating sideline；2. earth excavation at concrete beam；3. side slope protection；4. concrete beam pours；The most whether support door frame is installed；6. the erection of Bailey beam.
The most according to claim 3, high-pressure gas Guan Zong is across the construction method of foundation ditch suspension protection in situ; it is characterized in that: the form of construction work of described lattice column+Bailey beam includes: use 2 road lattice columns as main support; lattice column top board sets up concrete beam, then installs door frame and Bailey beam.
6. according to the arbitrary described high-pressure gas Guan Zong of claim 1-5 across the construction method of foundation ditch in situ suspension protection, it is characterised in that: the construction of described suspention system includes: the 1. earth excavation of pipeline；2. Bailey beam is installed and is reinforced；3. selection and the installation of supporting system are suspended in midair.
The most according to claim 6, high-pressure gas Guan Zong is across the construction method of foundation ditch suspension protection in situ, it is characterised in that: the construction of described pipeline protection system includes: 1. pipeline outsourcing protection；The most automatic temperature-controlled spray system is constructed；3. lightning protection construction；The most sun-proof construction；5. pipeline rigid protection construction.
The most according to claim 7, high-pressure gas Guan Zong is across the construction method of foundation ditch suspension protection in situ, it is characterised in that: described auto monitoring and measurement system construction includes: 1. deep soils system construction；2. CCD coordinatograph construction；3. low-consumption wireless data collection station construction.
The most according to claim 8, high-pressure gas Guan Zong is across the construction method of foundation ditch suspension protection in situ; it is characterized in that: the reduction construction of described pipeline includes: after correspondent section caving plate casting complete; concrete post is made as pipeline support post in Roof, pipeline bottom application; the every 6m of support column is together; each support column in suspension protection applied and reach intensity 75% after; the most dismountable should across suspension protective device; then former road surface it is backfilled to; recovering functional performance, pipe line suspension protection operation terminates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610197706.0A CN105822830A (en) | 2016-03-31 | 2016-03-31 | In-situ suspension protection construction method of high-pressure gas pipe longitudinally spanning over foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610197706.0A CN105822830A (en) | 2016-03-31 | 2016-03-31 | In-situ suspension protection construction method of high-pressure gas pipe longitudinally spanning over foundation pit |
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| CN111576446A (en) * | 2020-06-10 | 2020-08-25 | 中铁四局集团有限公司 | In-situ protection device for pressure pipeline in underground foundation pit and construction method |
| CN111577980A (en) * | 2020-04-17 | 2020-08-25 | 中建五局第三建设有限公司 | Nondestructive protection construction method and structure for foundation pit excavation pipeline of linear engineering in old city |
| CN113460196A (en) * | 2021-07-14 | 2021-10-01 | 中国水利水电第十四工程局有限公司 | Inspection robot |
| CN115405759A (en) * | 2022-08-19 | 2022-11-29 | 浙江交工集团股份有限公司 | Pile foundation rotary digging pore-forming underground gas pipeline in-situ isolation protection system and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108565781A (en) * | 2018-03-21 | 2018-09-21 | 上海宝冶集团有限公司 | A kind of in-situ conservation method and device of original cable and pipeline |
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| CN113460196A (en) * | 2021-07-14 | 2021-10-01 | 中国水利水电第十四工程局有限公司 | Inspection robot |
| CN113460196B (en) * | 2021-07-14 | 2022-09-02 | 中国水利水电第十四工程局有限公司 | Inspection robot |
| CN115405759A (en) * | 2022-08-19 | 2022-11-29 | 浙江交工集团股份有限公司 | Pile foundation rotary digging pore-forming underground gas pipeline in-situ isolation protection system and construction method |
| CN115405759B (en) * | 2022-08-19 | 2024-05-24 | 浙江交工集团股份有限公司 | In-situ isolation protection system for pile foundation rotary digging pore-forming underground gas pipeline and construction method |
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