CN105650345A - Construction method and detection device for top pipe outer wall thixotropic slurry lubricating sleeve formation in loose covering layer - Google Patents
Construction method and detection device for top pipe outer wall thixotropic slurry lubricating sleeve formation in loose covering layer Download PDFInfo
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- CN105650345A CN105650345A CN201610141265.2A CN201610141265A CN105650345A CN 105650345 A CN105650345 A CN 105650345A CN 201610141265 A CN201610141265 A CN 201610141265A CN 105650345 A CN105650345 A CN 105650345A
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- soil pressure
- jacking
- electronics
- pipe outer
- wall
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Classifications
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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
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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
- F16N—LUBRICATING
- F16N15/00—Lubrication with substances other than oil or grease; Lubrication characterised by the use of particular lubricants in particular apparatus or conditions
Abstract
The invention discloses a construction method and detection device for top pipe outer wall thixotropic slurry lubricating sleeve formation in a loose covering layer. The construction method comprises the steps of positioning, pressure adjustment, grout amount increasement and jacking. The detection device comprises a sleeve and an electronic soil pressure measuring device arranged in the sleeve. A propulsion motor arranged at the rear end of the sleeve is in contact with the electronic soil pressure measuring device. The propulsion motor communicates with a signal receiver through a controller. A data instructor communicates with the signal receiver through a wireless or wired network. A signal transmitter is connected with the electronic soil pressure measuring device. A data receiver communicates with the signal transmitter through a wired or wireless network. The construction method and detection device have the advantages that a jacking pipeline is made to be located in bentonite suspension, so that the problem that the resistance of the outer wall of a top pipe is large due to dry friction is solved, and engineering risks are reduced; and the detection efficiency of the soil pressure can be improved substantially through the detection device.
Description
Technical field
The present invention relates to the construction method that in a kind of loose overburden, push pipe outer wall sludge lubricant cover shapes, belong to the construction field of mire water equilibrium tube in hydraulic engineering, city planting ductwork engineering and corresponding engineering.
Background technology
Along with country's the carrying forward vigorously of Urbanization Construction, underground pipe network transformation and new, enlarging task is quite arduous. And due to historical reasons, underground pipe network is intricate, quite a few does not have dossier, and for avoiding large area excavation to remove old pipe network, do not affect resident's demand orthobiosis, adopting no-dig technique underground pipe-jacking technology is current approved construction technology.
During the Urban Segment of Lhasa Slurry Balanced Pipe Jacking Construction of Anyang water supply conveyance system Hua County, Middle Line Project For Transferring Water From South To North general main canal intake area, JPCCP buried depth of pipeline shallower (buried depth 6��8m), pipe top cover layer major part is the loose shape sandy loam of soil property inequality, artificial miscellaneous fill (more brick and tile fragment and house refuse, along the line major part are roadbed miscellaneous fill and bituminous paving), simultaneously the buried pipe such as city rain sewage conduct is in length and breadth and long neglected and in disrepair, defines natural leakage passage with surrounding soil. In this case, jacking pipeline sludge lubricant cover is not easily formed, and there is the dry friction phenomenon that jacking pipeline directly contacts with surrounding soil. When dry friction, pipe surface in pushing and withstanding process can by around soil layer sanding, thus make coefficient of friction increase. If processed not in time, being likely to result in very greatly the JPCCP pipeline hidden dangers in project by surrounding soil locking, dealing with also very thorny.
Summary of the invention
Construction method that the technical problem to be solved is to provide in a kind of loose overburden push pipe outer wall sludge lubricant cover and shapes and detection equipment, construction method is by adjusting thixotropic slurry mud jacking pressure, performance indications, jacking pipeline is made to be in bentonite suspension, and then solve the bigger problem of resistance that push pipe pipeline outer wall causes because of dry friction, reduce engineering risk; Detection equipment can increase substantially the detection efficiency of soil pressure.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is: the construction method that in a kind of loose overburden, push pipe outer wall sludge lubricant cover shapes includes location-----adjust pressure----increase grouting amount-----jacking;
Described location, hole-specifically checks at jacking pipeline manometer tube, it has been found that loses slurry pipeline section and carries out labelling location;
Described adjustment pressure, it has been found that after losing slurry pipeline section, adjusts mistake slurry section and injects the pressure of mud, and pressure is 0.2��0.3MPa;
Described increase grouting amount, is losing slurry pipeline section increasing, enriching grouting amount;
Described jacking, in increasing injection slurry process, repeatedly starts relay well and main top oil cylinder, makes top power gradually decrease down 4��7Mpa, and advance jacking tube to move on.
Further, in described increase grouting amount process, the injection slurry proportioning of filling is that specific gravity control is at 1.2��1.3g/cm3 containing bentonite 50kg, soda 2��2.5kg, CMC0.9��1.1kg in every cubic metre of serosity.
A kind of construction detection equipment shaped for push pipe outer wall sludge lubricant cover in loose overburden includes sleeve pipe, and it is located at the electronics soil pressure determinator in sleeve pipe, the propulsion electric machine being located at sleeve pipe rear end contacts with electronics soil pressure determinator, propulsion electric machine is connected with signal receiver by controller, and data command device is connected with signal receiver by wirelessly or non-wirelessly network;
Signal projector is connected with electronics soil pressure determinator, and data sink is connected with signal projector by wired or wireless network.
Further, electronics soil pressure determinator is connected with sleeve pipe front end by elastomeric element.
It is also possible that electronics soil pressure determinator is connected with elastomeric element by fixing plate.
Further, being provided with water-stop sheet in sleeve pipe, water-stop sheet is provided with hole, and bore edges is provided with rubber, and electronics soil pressure determinator is by hole traverse water-stop sheet.
Bentonite slurry is in noncohesive loose soil layer and in the soil that viscosity is only small, for instance in sandy loam, Extra-fine sand, if not taking other ancillary method, soil layer is due to extremely unstable own, so that will collapse on tube wall at once after push-bench advances. So for this soil, the supporting role of bentonite suspension is especially significant. In order to play this supporting role, prerequisite is to grasp the bentonite suspension characteristic at soil layer as precisely as possible. Bentonite suspension in the hole penetrating into soil layer, will be full of hole, and continues flowing, just as flowing in a rule capillary tube. Flow velocity depends on the transverse section of hole and the rheological behavior of suspension, also depends on mud jacking pressure simultaneously.
Therefore to be issued to identical depth of penetration at equal mud jacking pressure, just needing the suspension of low ductility limit in the particulate soil layer that hole transverse section is only small, the coarse grain soil layer bigger in hole transverse section then needs the suspension of high ductility limit. In the process overcoming flow resistance, the decay that mud jacking pressure is proportional along with the increase of depth of penetration, so each mud jacking pressure accordingly, there is a completely specified depth of penetration.
Thick for this loose overburden, buried depth of pipeline is shallow, push pipe pipeline mud lubrication overlaps the special circumstances not being easily formed, when configuring thixotropic slurry serosity, serosity adds a small amount of sodium carbonate (soda) and sodium carboxymethyl cellulose (CMC) powder, readjusting match ratio is: containing bentonite 50kg in every cubic metre of serosity, soda 2��2.5kg, CMC0.9��1.1kg, wherein bentonite is sodium bentonite. Serosity after adjusted has the excellent properties such as thickening, suspension, dispersion, water conservation, substantially increases the buoyancy of serosity, reduces pipe outer wall frictional resistance.
The invention has the advantages that:
1, mud jacking Stress control is in the reasonable scope, is of value to the formation of bentonite suspension, and then reduces the purpose of pipe outer wall frictional resistance.
2, when configuring thixotropic slurry serosity, serosity adds a small amount of sodium carbonate (soda) and sodium carboxymethyl cellulose (CMC) powder, greatly reduce the pushing and withstanding resistance of jacking pipeline, or alternatively under identical jacking power, increase jacking distance, and decreasing relay well usage quantity, first the distance pushing and withstanding of large-diameter pipeline can be produced favorable influence by this effect.
Accompanying drawing explanation
Fig. 1 is a kind of construction assay device structures schematic diagram shaped for push pipe outer wall sludge lubricant cover in loose overburden.
Fig. 2 is a kind of construction detection equipment preferred structure schematic diagram shaped for push pipe outer wall sludge lubricant cover in loose overburden.
Fig. 3 is sleeve pipe preferred structure schematic diagram.
Fig. 4 is instruction control structure schematic diagram.
Fig. 5 is data acquisition structural representation.
Fig. 6 is water-stop sheet structural representation.
In figure, sleeve pipe 1, electronics soil pressure determinator 2, propulsion electric machine 3, controller 4, signal receiver 5, data command device 6, signal projector 8, data sink 9, elastomeric element 10, fixing plate 11, water-stop sheet 12.
Detailed description of the invention
The construction method that in a kind of loose overburden, push pipe outer wall sludge lubricant cover shapes includes location-----adjust pressure----increase grouting amount-----jacking;
1) location
Hole-specifically check at jacking pipeline manometer tube, inspection can normally slip casting, plasma discharge, further determine that the formational situation of mud sleeve, it is determined that slurry pipeline section and particular location is lost in dehydration; Find that losing slurry pipeline section carries out labelling location;
2) pressure is adjusted
After finding mistake slurry pipeline section, adjust the pressure losing slurry section injection mud, pressure is 0.2��0.3MPa, if mud jacking hypertonia, bentonite suspension can be gushed out from injected hole, around slurry hole, form a high compression district, be thus likely to form thromboembolism, hinder continuing to flow out and spreading of bentonite suspension;
3) grouting amount is increased
At resistance exception pipeline section (namely slurry pipeline section is lost in dehydration) increasing, enriching grouting amount, the thixotropic slurry match ratio of mixing is: containing bentonite 50kg in every cubic metre of serosity, soda 2��2.5kg, CMC0.9��1.1kg, specific gravity control is within the scope of 1.2��1.3g/cm3, viscosity controls when about 180s, and when adjusting thixotropic slurry mud jacking pressure, pipe outer wall unit are average friction Resistance Value can drop to 4��5kN/m simultaneously2Lower resistance within the scope of;
4)Jacking
Continue slip casting, mend slurry and repeatedly start relay well and main top oil cylinder, it is ensured that the resistance of ducting of the normal pipeline section of top power is in controlled range and is gradually reduced, make top power gradually decrease down 4��7MPa, improve the top power being transferred to resistance abnormal section.
Item enters to should be noted problems with in process:
If 1. the bentonite of disposable injection can remain unchanged in the soil layer of pipeline, once it is sufficient to as long as so directly injecting after head cutting shoe, but fairly obvious, in pipeline progradation, bentonite is owing to consuming to some extent in the soil layer that scatters.
In consideration of it, subsequent pipeline also be must be supplemented with press-in bentonite, so that the bentonite suspension pressure in space can keep consistent with soil pressure in whole length of jacking pipeline between pipeline and soil layer. According to field condition, every length of tubing has injected hole, mends slurry order and is: front 3 to 5 joints all mend slurry (9��15m), afterwards, mend slurry every 2 to 5 length of tubing.
2. under the occasion of Large Diameter Pipeline jacking, can dividing upper and lower two parts slip casting, because in the lower half of pipeline, bentonite is easier to than under resting state flow out in jack-in process, and the slip casting of the first half is then be easier to make for when pipeline is static.Therefore preferably the injected hole of pipeline lower half and the injected hole of the first half are respectively combined. This half side pipeline that reason for this is that resting state outpoured falls within bottom with its all very big heavy, so just defines little space at the top of pipeline, or is at least defining a relatively low region of pressure. Thus in this state, serosity is easier to flow out than in duct bottom at pipeline top.
Otherwise, under pressure on top surface and buoyancy act on simultaneously, the tendency arched upward on pipeline is oriented. At this moment the liftoff rise of pipeline, then duct bottom defines a low-pressure area, causes bentonite to be more prone to infiltration and wherein and equably scatters.
If 3. jacking pipeline is divided into some sections by relay well, then always only one of which line segments is promoted, and all the other each section then remains stationary as every time. At this moment it is suitable in the line segments promoted, only injects serosity, and for actionless line segments, then stop slip casting. Additionally, bentonitic injection will with the close look at the swing of relay well, this point can manually or the mode of far distance automatic controlling realize.
4. it is to be particularly noted that serosity must not be in opposite direction with pipeline jacking along the direction of vessel wall motion, otherwise, reverse movement due to pipeline and serosity, not only suspension does not have lubrication, having played the effect of braking medium on the contrary, result will be greatly increased jacking resistance. If only inject serosity in the proparea of jacking pipeline, reverse movement will be there is, because suspension just has to flow backward in this case. So correct way is that the injection of serosity to keep direction from back to front all the time.
Operation principle: by correctly press-in bentonite suspension, thus forming an endless supporting belt around jacking pipeline in soil layer, namely lubricating sleeve, and keep pressure of suspending liquid to be equal to soil pressure, then pipeline will in bentonite suspension float, it is in that suspension should be liquid for this required premise, that is is rendered as the collosol state that apparent ductility limit is relatively low accordingly. Bentonite content at suspension is low to during close to stability limit under kinestate, and this condition just can be met. Buoyancy can make pipeline outer wall frictional resistance reduce, because the normal force that duct bottom produces due to deadweight decreases, consequently facilitating promote.
In Fig. 1, a kind of construction detection equipment shaped for push pipe outer wall sludge lubricant cover in loose overburden includes sleeve pipe 1, and it is located at the electronics soil pressure determinator 2 in sleeve pipe 1, the propulsion electric machine 3 being located at sleeve pipe 1 rear end contacts with electronics soil pressure determinator 2, in Fig. 4, propulsion electric machine 3 is connected with signal receiver 5 by controller 4, and data command device 6 is connected with signal receiver 5 by wirelessly or non-wirelessly network;
During work, data command device 6 sends instruction to signal receiver 5 and starts propulsion electric machine 3, controller 4 sends signal to propulsion electric machine 3, propulsion electric machine 3 works and electronics soil pressure determinator 2 is released sleeve pipe 1, after mensuration completes, data command device 6 sends halt instruction, and data command device 6 sends instruction stopping propulsion electric machine 3 to signal receiver 5 and works, controller 4 sends signal to propulsion electric machine 3 after receiving instruction, and propulsion electric machine 3 reclaims and quits work.
In Fig. 5, signal projector 8 is connected with electronics soil pressure determinator 2, and data sink 9 is connected with signal projector 8 by wired or wireless network; During work, electronics soil pressure determines after device 2 is pushed out sleeve pipe 1, after measuring the pressure of soil, by signal projector 8, data to be sent to data sink 9.
Preferably, in Fig. 2, electronics soil pressure determinator 2 is connected with elastomeric element 10 by fixing plate 11, and elastomeric element 10 is connected with sleeve pipe 1 front end. During work, propulsion electric machine 3 promotes electronics soil pressure determinator 2 to move to sleeve pipe 1 front end, carry out pressure measurement in underground layer of going forward side by side, and causes elastomeric element 10 to deform, when propulsion electric machine 3 reclaims, elastomeric element 10 recovers original shape, and electronics soil pressure determinator 2 is drawn back into original position.
Preferably, in Fig. 3, water-stop sheet 12 it is provided with in sleeve pipe 1, in Fig. 6, water-stop sheet 12 is provided with hole, and bore edges is provided with rubber, electronics soil pressure determinator 1 is by hole traverse water-stop sheet, water-stop sheet can stop the water in soil layer to enter in sleeve pipe 1, and the rubber of water-stop sheet bore edges is made by self-deformation can be tight by electronics soil pressure determinator 1 edge wrap through hole, reduces the space of electronics soil pressure determinator and water proof plate hole.
During work, the soil pressure that a kind of construction detection equipment shaped for push pipe outer wall sludge lubricant cover in loose overburden is arranged on jacking pipeline measures in hole, every jacking one segment distance, all measure in hole in jacking tube soil pressure and this device is set, when needing to measure a certain section of jacking tube soil pressure, send command adapted thereto by data command device 6 and start propulsion electric machine 3, and can complete to survey soil pressure by data sink electronics soil pressure determinator 2, it is adaptable to the positioning step of the construction method that push pipe outer wall sludge lubricant cover shapes in loose overburden of the present invention.
Another of this device is characterized in that; can the soil pressure of Real-time Collection jacking tube; data support is provided for subsequent construction; operator need not repeatedly enter the operation carrying out soil pressure mensuration in push pipe; can be headed at push pipe is placed in advance in soil pressure mensuration hole by this device between in soil; after push pipe top puts in place, start this device by remotely controlling, not bad by protecting by the protection electronics soil pressure determinator 2 of sleeve pipe in jack-in process.
Instant invention overcomesJacking pipeline sludge lubricant cover is not easily formed, and there is the dry friction phenomenon that jacking pipeline directly contacts with surrounding soil;
Also overcome the JPCCP pipeline hidden dangers in project by surrounding soil locking, in the implementation process on many ground, Hubei, it has been found that the method safety is comparatively reliable, is particularly well-suited to densely inhabited district, can effectively prevent from leaking the security incident caused because of sewer.
Find that a little methods can also use the supporting of other underground construction at practice process, form protective layer by slip casting.
The above embodiments are only the preferred technical solution of the present invention; and it is not construed as the restriction for the present invention; the technical scheme that protection scope of the present invention should be recorded with claim, is protection domain including the equivalents of technical characteristic in the technical scheme that claim is recorded. Namely equivalent replacement the within the scope of this is improved, also within protection scope of the present invention.
Claims (6)
1. the construction method that in a loose overburden, push pipe outer wall sludge lubricant cover shapes, it is characterised in that: described method includes location-----adjust pressure----increase grouting amount-----jacking;
Described location, hole-specifically checks at jacking pipeline manometer tube, it has been found that loses slurry pipeline section and carries out labelling location;
Described adjustment pressure, it has been found that after losing slurry pipeline section, adjusts mistake slurry section and injects the pressure of mud, and pressure is 0.2��0.3MPa;
Described increase grouting amount, is losing slurry pipeline section increasing, enriching grouting amount;
Described jacking, in increasing injection slurry process, repeatedly starts relay well and main top oil cylinder, makes top power gradually decrease down 4��7Mpa, and advance jacking tube to move on.
2. the construction method that in a kind of loose overburden according to claim 1, push pipe outer wall sludge lubricant cover shapes, it is characterized in that: in described increase grouting amount process, the injection slurry proportioning of filling is that specific gravity control is at 1.2��1.3g/cm3 containing bentonite 50kg, soda 2��2.5kg, CMC0.9��1.1kg in every cubic metre of serosity.
3. the construction detection equipment shaped for push pipe outer wall sludge lubricant cover in loose overburden, it is characterized in that: described detection equipment includes sleeve pipe, and it is located at the electronics soil pressure determinator in sleeve pipe, the propulsion electric machine being located at sleeve pipe rear end contacts with electronics soil pressure determinator, propulsion electric machine is connected with signal receiver by controller, and data command device is connected with signal receiver by wirelessly or non-wirelessly network;
Signal projector is connected with electronics soil pressure determinator, and data sink is connected with signal projector by wired or wireless network.
4. a kind of construction shaped for push pipe outer wall sludge lubricant cover in loose overburden detects equipment according to claim 3, it is characterized in that: described electronics soil pressure determinator is connected with sleeve pipe front end by elastomeric element.
5. a kind of construction shaped for push pipe outer wall sludge lubricant cover in loose overburden detects equipment according to claim 4, it is characterized in that: described electronics soil pressure determinator is connected with elastomeric element by fixing plate.
6. a kind of construction shaped for push pipe outer wall sludge lubricant cover in loose overburden detects equipment according to claim 3, it is characterized in that: in described sleeve pipe, be provided with water-stop sheet, water-stop sheet is provided with hole, and bore edges is provided with rubber, and electronics soil pressure determinator is by hole traverse water-stop sheet.
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|---|---|---|---|
| CN201610141265.2A CN105650345B (en) | 2016-03-14 | 2016-03-14 | The construction method and detection device that push pipe outer wall sludge lubricant cover shapes in a kind of loose overburden |
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| CN201610141265.2A CN105650345B (en) | 2016-03-14 | 2016-03-14 | The construction method and detection device that push pipe outer wall sludge lubricant cover shapes in a kind of loose overburden |
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2016
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