CN105840202A - Shield tail brush replacement annular freezing reinforcing water seal structure and construction method thereof - Google Patents
Shield tail brush replacement annular freezing reinforcing water seal structure and construction method thereof Download PDFInfo
- Publication number
- CN105840202A CN105840202A CN201610188081.1A CN201610188081A CN105840202A CN 105840202 A CN105840202 A CN 105840202A CN 201610188081 A CN201610188081 A CN 201610188081A CN 105840202 A CN105840202 A CN 105840202A
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- Prior art keywords
- shield
- freezing
- annular
- pipe
- jurisdiction
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
Abstract
The invention discloses a shield tail brush replacement annular freezing reinforcing water seal structure and a construction method thereof; the reinforcing water seal structure uses annular freezing pipe construction equipment to bury 1-2 annular freezing pipes in the soil body position needs to replace the shield tail brush, and uses an artificial freezing mode to enable the soil body around the annular freezing pipes to form a temporary annular frozen soil curtain reinforcing water seal structure; the specific technical process is listed as below: construction preparation-annular freezing pipe boring construction-freezing system and temperature measurement system installation-active freezing(temperature monitoring)-dismounting duct piece and replacing shield tail brush (freezing maintenance)-forced unfreezing-annular freezing pipe extraction (sealing hole)-back filled grouting-shield continue propulsion. The construction method is simple, easy to operate and realize, strong in construction practicality, convenient in construction quality control, good in reinforcing effect and water seal effect, outstanding in safety and reliability, and has very big application values.
Description
Technical field
The present invention relates to reinforce water sealing structure during a kind of exchanging shield ventral brush, when being specifically related to a kind of exchanging shield ventral brush, annular is frozen
Knot reinforces water sealing structure and construction method thereof.
Background technology
No matter it is balancing earth-pressure shielding machine or slurry balance shield machine, is all operation in the environment of closing, shield machine
Interior should be dry.But, for various reasons, there will be infiltration in various degree inside shield machine, ooze the phenomenons such as mud,
And shield machine internal leak phenomenon is concentrated mainly on shield tail.How preventing and treating and controlling shield tail leakage problems is in shield tunnel construction
Another key subject.Shield tail seepage is improper mainly due to section of jurisdiction assembling, the back of the body fills in unfavorable, the oil quantity of slurry and insufficient pressure, shield
Ventral brush damage etc. causes.
Due to reasons such as pipe sheet assembling is improper, shield long distance drivings, damaging can inevitably occur in shield ventral brush, according to
Experience, under shield normal operating conditions, the life-span of shield ventral brush is typically at about 2.5km；The damage of shield ventral brush can cause shield tail close
Envelope property declines, and serious meeting affects shield and normally tunnels, and in this case, need to be replaced the shield ventral brush damaged；In the past
Engineering practice in exchanging shield ventral brush mostly use increasing shield tail synchronous grouting amount and change slip casting proportioning with accelerate serosity coagulate
Admittedly the measure of grade.But, the stratum inadaptability of slip casting method, the poor continuity of grouting curtain, lack of homogeneity, the slip casting soil body and shield
And flexible and toughness the unfavorable factor of cementing shortage of section of jurisdiction is objective reality, may result in the risk hidden danger of water shutoff difference.Right
Excessive risk work under the conditions of full water weak soil, the stratum of slip casting lack of homogeneity, subaqueous tunnel and exchanging shield ventral brush are long in time limit etc.
Journey, grouting seal water is still without absolutely holding；Compared to ejection for water plugging layer, the Frozen Soil Cylinder that freezing process is formed has seriality
Well, uniformity is good, water shutoff is good, pliability is good, intensity advantages of higher.Therefore, engineering with artificial freezing method starts extensively to apply to shield tail
Construction changed by brush.
Summary of the invention
For the technical problem of above-mentioned existence, it is an object of the invention to: when proposing a kind of exchanging shield ventral brush, annular is freezed to add
Gu water sealing structure and construction method thereof, there is construct practical, quality control on construction convenience, consolidation effect particularly sealing effect
The outstanding advantages such as fruit is good and safe and reliable, have bigger application value.
Annular consolidation by freezing sealing knot when the technical solution of the present invention is achieved in that a kind of exchanging shield ventral brush
Structure, described reinforcing water sealing structure is to utilize annular freezing pipe construction equipment to bury 1 underground in the soil body needing to change shield ventral brush position
～2 annular freezing pipes, then use the mode of manual pipe jacking to make the soil body around annular freezing pipe form interim annular and freeze
Soil curtain reinforcement water sealing structure.
Preferably, described annular freezing pipe material is usually seamless low carbon steel pipe, it would however also be possible to employ PVC, PPR, ABS, PE
Plastic tube.
Preferably, described annular freezing pipe cross section is circular, it would however also be possible to employ " I-shaped ", " X-shaped ", " T-shaped ", " Y shape "
Odd-shaped cross section.
During a kind of exchanging shield ventral brush, the construction method of annular consolidation by freezing water sealing structure specifically includes following processing step:
One, technical flow design
Preparation of construction → annular freezing pipe drilling construction → freezing system and temp measuring system install → actively freeze (temperature prison
Survey) → remove section of jurisdiction change shield ventral brush (maintenance is freezed) → forced thaw → annular freezing pipe pull out (sealing of hole) → grouting behind shaft or drift lining →
Shield continues to advance；
Two, freeze design
(1) annular freezing hole is arranged
Outside the section of jurisdiction changing shield ventral brush, 1～2 is buried underground on the precalculated position of the soil body by annular freezing pipe construction equipment
Annular freezing pipe, the soil body generally 1 arrangement outside replacing shield ventral brush section of jurisdiction of this annular freezing pipe is put, in the case of water shutoff requires height
Also 2 row's annular freezing pipes can be arranged；
(2) thermometer hole is arranged
The position of thermometer hole is adjusted by the deflection situation according to boring；
Three, refrigerant system design
(1) parameter is chosen
1) annular freezing pipe is preferably selectedSeamless low carbon steel pipe；
2), when using saline coolant media, freezing period outlet brine temp is-28～-30 DEG C, and loop brine temp is-25
～-28 DEG C；
3) saline proportion 1.26；
4) brine flow 5m in freezing pipe3/h；
5) freezing pipe heat-sinking capability: 260Kcal/m2.h；
6) loss of refrigeration capacity coefficient: 1.2；
(2) chilling requirement calculates
Freeze chilling requirement to calculate: Q=1.2 π d H K
In formula: H-freezes total length；
D-freezing pipe diameter；
K-freezing pipe coefficient of heat transfer；
(3) Freezing Station setting, Unit Selection and quantity
(4) brine system
1) salt water conduit tube, collection brine distributing ring type selecting:Welded tube processing and fabricating；
2) the total consumption of calcium chloride (80% crystal): 15 tons；
3) brine pump type selecting: select 3 IS150-125-315 type centrifugal water pumps (wherein standby), flow
200m3/ h, motor 30kw；
(5) clean water system
1) clear water pipe type selecting:Welded tube processing and fabricating；
2) 8m is selected3Filtered water tank 3；
3) fresh water magnitude of recruitment: 30m3/h；
4) 3 IS150-125-315 type centrifugal water pumps, flow 200m are selected3/ h, motor 30kw；
5) KST-80 type cooling tower 4 is selected；
(6) freezing pipe design
Annular freezing pipe is preferably selectedSeamless low carbon steel pipe, it is possible to select
Seamless low carbon steel pipe；Feed pipe is selectedSeamless steel pipe；
Four, drill construction technique: boring preparation → freezing hole measurement and positioning → rig installation centering → normally creep into → answer
Survey, leak detection → single hole completes → holes to terminate；
Five, frozen construction technique: flow process is Operational preparation → foundation construction → the said equipment installation → pressure testing, wrapping insulation
→ fill fluorine, test running → normal operation → exchanging shield ventral brush → remove → withdraw；Also needed to before filling fluorine, test running process into
Row frigo is installed and freezing hole is checked and accepted, and carries out cooling down water supply during filling fluorine, test running；
Following condition whether is met when six, judging exchanging shield ventral brush
(1) actively freeze-off time meets or exceeds 30 days, and brine freezing effect reaches to design requirement；
(2) speculating that annular Frozen Soil Cylinder effective thickness reaches 1.8 meters according to thermometer hole thermometric, annular Frozen Soil Cylinder is the warmest
Degree reaches-10 DEG C；
(3) thermometer hole temperature all reaches subzero；
(4) construction emergency preplan is perfect, and has operability；
(5), before exchanging shield ventral brush, near the shield ventral brush near annular Frozen Soil Cylinder, position, section of jurisdiction opens two spies respectively
Survey observation port, anhydrous outflow；
Seven, freezing pipe is pulled out technique and is specifically included following sequence processing step: forced thaw → saline heating → saline follows
Ring → defrosting measurement → freezing pipe rises and pulls out；
Eight, frost heave controls with thaw collapse
(1) after freezing pipe is extracted, closely knit by freezing hole yellow ground filling in time；
(2) in the thawing stage of frozen soil body, the injected hole of available tunnel duct piece carries out slip casting densification to consolidation by freezing district
Reinforce the freeze thawing soil body；Because the natural melting process of frozen soil body is slow, little pressure, the mode of many notes time is preferably taked to carry out slip casting, note
Slurry pressure is generally 0.2～0.5MPa, and serosity preferably selects single liquid cement mortar；
(3) for pre-anti-freeze expansion and thaw collapse, the freezing unit that design selection standard refrigerating capacity is bigger, at short notice salt
Coolant-temperature gage drops to design load, to accelerate frozen soil development, improves frozen soil strength, reduces frost heave and thaw collapse amount；
(4) grasp and adjust brine temp and brine flow, batch (-type) can be taked if desired to freeze, control frozen soil development
Amount, to reduce frost heave and thaw collapse；
Nine, exchanging shield ventral brush
First being advanced to about 1m, the welding carrying out pipe lengthens jack, then advances, until first shield tailings is complete
Entirely expose；Stop advancing, directly carry out whole circle with changing；After changing, measurement and positioning, it is welded with gap of the shield tail pad, with adding
The long-armed pipe sheet assembling that carries out, pushing tow section of jurisdiction is slided, and with upper ring distance 100mm, to hole, wears bolt, pushing tow, the old and new section of jurisdiction pair
Connect, bolt fastening advances, and pipe cuts off after supporting abjection；
(1) 3 ring scope lower half circle 2-3 injected holes after shield hoop, and mounting ball valve are reserved when changing shield ventral brush, standby
Leak grouting behind shaft or drift lining or injection polyurethane；
(2) shield ventral brush is exposed, the waste oil removed between shield ventral brush in seal groove and mortar；
(3) shield tail is just checked do not have the shield ventral brush of use value directly to cut off to serious wear, and to cutting off district
Territory carries out polishing process；The wear-resistant relatively light shield ventral brush simply consolidated by mortar is cleared up, and uses Reinforced hook combing during cleaning
Shield ventral brush, the cleaning of shield ventral brush is wanted thoroughly；The part cut off to weld new shield ventral brush again, carries out sealing shield ventral brush with welding rod
Again welding, welding quality requires that the spacing between adjacent shield ventral brush is not more than 3mm；To the sealing between shield ventral brush and shield ventral brush
Groove smears tail seal grease of shield again；
(4) measuring shield tail surrounding gap record, manufacture and be welded with gap of the shield tail support pipe on tail shield, section of jurisdiction is risen by pipe
To supporting role, it is to avoid section of jurisdiction drops on shield shell, make the gap of the shield tail that section of jurisdiction is identical with a upper ring holding, it is ensured that newly installed ring
Concentric with a upper ring；
(5) installing section of jurisdiction, install section of jurisdiction and follow the order installed from bottom to top, the K block that binds selects II point or I point position；
After erecting ring in whole completes, elapse section of jurisdiction the most backward；Pushing tow erecting ring in whole section of jurisdiction, with a upper ring away from 100mm；In two endless tube sheet phases
Starting to penetrate bolt when 10mm, segment bolt is worn to newly spelling section of jurisdiction from installing section of jurisdiction；When section of jurisdiction puts in place, 10 groups of jack
The most afterburning, in order to two endless tube sheet contacts closely, fasten all bolts of the domain repeatedly；
(6), after section of jurisdiction is installed and put in place, shield tail grease pump to be used pumping tail seal grease of shield, filling is manually smeared uncompacted
Shield ventral brush groove and shield ventral brush；
(7) operating pressure of shield tail grease pump can be set, can stop after reaching setup pressure value；Recover normal to advance,
Behind the supporting steel plate abjection section of jurisdiction of welding, cut off, shield shell is done grinding process；
(8) take soil pressure Conservation measures in changing, prevent body center of gravity from moving forward, cause attitude, gap, shield tail full circle degree to send out
Changing；
(9) section of jurisdiction is installed, recovers driving；After completing a series of activities, segment assembly, measure between shield tail before pipe sheet assembling
Gap, carries out segment selection；Due to stress long-time bottom shield tail, bottom gap of the shield tail is relatively big, and top gap of the shield tail is too small, pipe
When sheet is installed, carry out by first up and then down；After section of jurisdiction completes to install, driving after shield endnote is entered enough oils and fatss, can be recovered；
Ten, the protective measure after sealing brush is changed includes filling oils and fats, sealing brush is put the oil, seal groove fills oils and fats and cleaning
Bottom shield shell.
Due to the utilization of technique scheme, the present invention compared with prior art has the advantage that
The present invention is prefabricated with during exchanging shield ventral brush to be freezed compared with section of jurisdiction freezes sealing, to tackle sudden accident, shape of punching
Formula is versatile and flexible, can be adjusted according to on-site actual situations；One week freezing pipe of laying is only reinforced with directly punching along section of jurisdiction
Water is compared, and has simply laid 1-2 freezing hole on section of jurisdiction, the impact that the structure durability of section of jurisdiction is caused not quite, to shield
Tunnel structure stability has no adverse effect, and has construct practical, quality control on construction convenience, consolidation effect particularly sealing
The outstanding advantages such as effective and safe and reliable, has bigger application value.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings technical solution of the present invention is described further:
Annular consolidation by freezing water sealing structure schematic diagram when accompanying drawing 1 is the exchanging shield ventral brush of the present invention；
Annular consolidation by freezing water sealing structure construction process figure when accompanying drawing 2 is exchanging shield ventral brush in the present invention；
Accompanying drawing 3 is the drilling construction flow chart in the present invention；
Accompanying drawing 4 is the frozen construction flow process in the present invention；
Accompanying drawing 5 is the exchanging shield ventral brush construction process figure in the present invention；
Wherein: 1, shield ventral brush；2, the soil body；3, annular freezing pipe；4, section of jurisdiction.
Detailed description of the invention
The present invention is described below in conjunction with the accompanying drawings.
Annular consolidation by freezing water sealing structure during the exchanging shield ventral brush of the present invention as shown in Figure 1, is to utilize annular to freeze
Pipe construction equipment buries 1～2 annular freezing pipe 3 underground in the soil body 2 needing replacing shield ventral brush 1 position, then uses and manually freezes
The mode of knot makes the soil body 2 around annular freezing pipe 3 form interim annular Frozen Soil Cylinder and reinforces water sealing structure.
During the exchanging shield ventral brush of the present invention, annular consolidation by freezing water sealing structure construction technology is as follows with points for attention:
One, construction technology process
Preparation of construction → annular freezing pipe drilling construction → freezing system and temp measuring system install → actively freeze (temperature prison
Survey) → remove section of jurisdiction change shield ventral brush (maintenance is freezed) → forced thaw → annular freezing pipe pull out (sealing of hole) → grouting behind shaft or drift lining →
Shield continues to advance.Whole construction process is as shown in Figure 2.
Two, freeze design
(1) annular freezing hole is arranged
On the precalculated position of the outer soil body in section of jurisdiction 4 changing shield ventral brush 1,1-2 root is buried underground by annular freezing pipe construction equipment
Annular freezing pipe 3, this annular freezing pipe 3 arranges and puts changing the outer soil body 2 generally 1 in shield ventral brush section of jurisdiction, the feelings that water shutoff requirement is high
Also 2 row's annular freezing pipes can be arranged under condition.
(2) thermometer hole is arranged
The position of thermometer hole is adjusted by the deflection situation according to boring, and purpose mainly measures freezing curtain scope not
Temperature development situation with position, in order to take corresponding control measure, it is ensured that the safety of construction.
Three, refrigerant system design
(1) parameter is chosen
1) annular freezing pipe is preferably selectedSeamless low carbon steel pipe；
2), when using saline coolant media, freezing period outlet brine temp is-28～-30 DEG C, and loop brine temp is-25
～-28 DEG C；
3) saline proportion 1.26；
4) brine flow 5m in freezing pipe3/h；
5) freezing pipe heat-sinking capability: 260Kcal/m2.h；
6) loss of refrigeration capacity coefficient: 1.2；
(2) chilling requirement calculates
Freeze chilling requirement to calculate: Q=1.2 π d H K
In formula: H-freezes total length；
D-freezing pipe diameter；
K-freezing pipe coefficient of heat transfer.
(3) Freezing Station setting, Unit Selection and quantity
Freezing Station selects W-YSLGF600II type screw rod fridge 2；Every unit refrigerating capacity 28 × 104Kcal/h, electricity
Acc power 220kw.
(4) brine system
1) salt water conduit tube, collection brine distributing ring type selecting:Welded tube processing and fabricating；
2) the total consumption of calcium chloride (80% crystal): 15 tons；
3) brine pump type selecting: select 3 IS150-125-315 type centrifugal water pumps (wherein standby), flow
200m3/ h, motor 30kw；
(5) clean water system
1) clear water pipe type selecting:Welded tube processing and fabricating；
2) 8m is selected3Filtered water tank 3；
3) fresh water magnitude of recruitment: 30m3/h；
4) 3 IS150-125-315 type centrifugal water pumps, flow 200m3/h, motor 30kw are selected；
5) KST-80 type cooling tower 4 is selected.
(6) freezing pipe design
Annular freezing pipe is preferably selectedSeamless low carbon steel pipe, it is possible to select
Seamless low carbon steel pipe；Feed pipe is selectedSeamless steel pipe.
Four, drill construction technique: boring preparation → freezing hole measurement and positioning → rig installation centering → normally creep into → answer
Survey, leak detection → single hole completes → holes to terminate.
Five, frozen construction technique (during mainly for brine freezing, liquid nitrogen freezing is case of emergency)
(1) frozen construction capital equipment
| Implementor name | Model | Equipment merit | Equipment performance |
| Screw machine | W-YSLGF60 | 220 | |
| Brine pump | IS150-125 | 30 | Standby 1 |
| Clarified water pump | IS150-125 | 30 | Standby 1 |
| Cooling tower | KST-80 | 4 | |
| Other | 30 | ||
| Add up to | 666 |
Freezing period total power load about 666kw, in the case of considering that line voltage distribution loss is relatively big, whole refrigeration station selects
With YC3 × 120+2 × 25 low pressure Plastic-sheathed Cable 3, freeze unit and corresponding corollary equipment for 2 respectively.
(2) frozen construction flow process: technological process is Operational preparation → foundation construction → the said equipment installation → pressure testing, wrapping
It is incubated → fills fluorine, test running → normal operation → exchanging shield ventral brush → remove → withdraw；Also needed before filling fluorine, test running process
Frigo to be carried out is installed and freezing hole is checked and accepted, and carries out cooling down water supply, as shown in Figure 4 during filling fluorine, test running.
(3) Freezing Station is installed
Freezing Station is arranged in side, and 2 units are installed in parallel, can be the most standby, and refrigeration station takes up an area about 200 square metres.
(4) installation of freezing unit
1) in place and fixing
According to Freezing Station layout drawing, after in place for freezing unit, reliably fix with basis with bolt.Note time fixing
With horizon rule, unit is carried out levelling, by constantly adjusting parallels by unit leveling.
Arrange according to on-the-spot pipeline, condenser two epicranial plate can be adjusted flexibly, reached to optimize the mesh that pipeline is arranged
's.
Unit starting cabinet is reliably arranged in unit side, the most easy to operate position, notes simultaneously between unit
Leave certain space, Operation and Maintenance at ordinary times be brought convenience.
2) pipeline connects
Use Flange joint between saline line and clear water pipeline and unit, will reasonably arrange installation valve, be beneficial to flat
Time open and close operation, provide convenient to stubborn bolt when safeguarding etc. again.
3) unit sealing detection
Freezing unit must ensure that the sealing property of unit is reliable, otherwise causes unit to leak fluorine, and refrigerating efficiency declines, and reaches
Less than preferable refrigeration.
First carry out the leak detection of refrigeration system, after guaranteeing that system is without rushing down leakage, then fill fluorine oiling.
4) unit refuels
Checking the amount of refrigerator oil in unit, if very few, will refuel to unit, freezing unit selects 46# refrigerator oil.
(5) clear, the installation of brine pump
Check water pump and motor, it is ensured that not damage in transportation and handling procedure；Checking tool and hoisting machinery, and examine
Look into the basis of machine；The basic plane installing armored pump answers level leveling, reexamines the levelness of the most whole unit after placing；
The suction line of pump and discharge pipeline should have respective support, do not allow pipe weight directly to be born by pump；Pump shaft revolves with motor
Turning direction should be consistent；Pump intake is unsuitable too high, is higher than about 20cm at the bottom of clear, brine tank；Pacify at clear water pump intake
Fill one filter screen, one filter screen is set in the middle of brine tank, to have prevented foreign material to be inhaled in pipeline.Check pump and pipeline and knot
There is non-loosening phenomenon at conjunction, rotate pump shaft with hands, check that pump shaft rotates the most flexible；Bearing lubrication machine is added in bearing body
Oil, observing oil level should be in the centerline of oil ga(u)ge, and lubricating oil should be changed in time or supplement.
(6) installation of cooling tower
It should be noted that fire prevention in cooling tower installation process, forbid at naked lights such as tower body and neighbouring uses electric welding (or gas cutting) thereof,
Also not in field personnel's smoking etc..As employed naked light, corresponding safety measure should be taked.
Cooling tower basis should keep level, it is desirable to pillar is vertical with basal plane, and each basal plane discrepancy in elevation is less than ± 1mm.Centre-to-centre spacing
Tolerance is ± 2mm；During tower body assembly, bolt should symmetry fasten, and does not allow to distort installation by force, must not leak after assembly；Cold
But tower column foot and basis fixation；Cooling tower parts, during transport, depositing, it does not allow ballast, must not be sudden and violent
Shine, and note naked light；Cooling tower inlet tube and outlet tube and supplementary water pipe should be separately provided support of pipelines, it is to avoid by pipeline weight transmitting
Tower body；Fan blade should be kept properly, and prevents deformation；Motor and driving member should oil, at indoor storage；For avoiding foreign material to enter
Nozzle, aperture, should carefully clear up before assembling；After cooling tower installs, the dirts such as pipeline, filling surface, water-collecting tray should be cleared up
And remains in tower, and carry out system flush.
(7) freezing unit regulation
Before refrigeration system is debugged, the cleaning of internal system and dry work must be carried out；
1) cold-producing medium is filled
After in-site installation, if visual examination does not finds accidental injury, if it find that cold-producing medium menometrorrhagia is complete or not enough,
Should first find out leakage point and get rid of leakage phenomenon, be subsequently adding cold-producing medium.When filling, can directly fill from special topping up valve
Enter；Refrigerant charge is not enough, and cold can be caused not enough；Refrigerant charge is too much, not only can increase expense, and to operation
Energy consumptions etc. may bring adverse effect.
2) debugging
Main electric-control system can be done simulated action detection, i.e. unit main frame no power, control system before formal start
Energising, then by unit inner setting, detects the electric-control system of unit, assembly whether normal operation.If it is automatically controlled
There is any problem in system, can solve in time.Last logical upper host power supply again, debugs.
Debugging during, should be specifically noted that following some:
Check whether the valve everywhere in refrigeration system is in normal opening, particularly discharge line valve, be sure not
Close.
Opening the cooling water valve of condenser and the Cold water tap of vaporizer, the flow of cold water and cooling water should meet unit
Technology requirement.
It should be noted that the supply voltage observing unit is the most normal before starting.
3) run
According to fridge rule of operation requirement, start unit.
When after unit starting, according to unit description requirement, check that the parameters of unit is the most normal.
Each item data of unit is carried out record, particularly some major parameters and must record clear.
In unit running process, it should be noted that the increasing of compressor, off-load mechanism the most normally work.
Answer the safety guard installed in proper use of refrigeration system, such as high-low pressure protection device, cold water and cooling water
Cut off the water supply the equipment such as flow switch, relief valve, should change in time if any damaging.
4) exception monitoring
Such as there are abnormal conditions in screw-type water chiller, answers hard stop inspection.
Properly functioning being masked as of screw type refrigerating compressor:
Compressor Discharge Pressure is 0.8～1.5MPa (gauge pressure)；
Compressor exhaust temperature is 45～90 DEG C；
The oil temperature of compressor is about 40～55 DEG C；
The oil pressure of compressor is 0.2～0.3MPa (gauge pressure)；
During compressor operating, sound should uniformly, steadily, sound without exception；The condensation temperature of unit should compare coolant water temperature
Spend high 3～5 DEG C；Condensation temperature typically should control at about 40 DEG C, and condenser inflow temperature should be below 32 DEG C；The evaporation of unit
Temperature should be lower than the leaving water temperature of chilled water 3～4 DEG C, and chilled water leaving water temperature is generally about 5～7 DEG C.
(8) clear, the debugging of brine pump
Check that there is non-loosening phenomenon pump and pipeline and junction, rotate pump with hands, try that pump shaft rotates the most flexible；To axle
Holding internal addition bearing lubrication machine oil, observing oil level should be in the centerline of oil ga(u)ge, and lubricating oil should be changed in time or supplement；Crawl
Motor, tries that motor steering is the most correct.Start motor, when pump run well after, open delivery gauge and, demonstrate depending on it
Suitably after pressure, it is gradually opened gate valve, checks motor load situation simultaneously.
Observe the pump housing and whether pipeline vibrates excessive, want parking checking reason time excessive and process.Control pump as far as possible
Flow and the scope that indicates on label of lift in, to ensure that pump operates at best efficiency point, could obtain maximum energy-conservation
Effect.Pump is in running, and bearing temperature not can exceed that ambient temperature 35 DEG C, and maximum temperature must not exceed 80 DEG C；As found
Pump has the abnormal sound should parking checking reason immediately.
(9) other
Freeze machine oil and select N46 refrigerator oil；
Freon R-22 selected by cold-producing medium；
Refrigerant agent selects calcium chloride solution.
Six, the condition of exchanging shield ventral brush
Exchanging shield ventral brush must possess following condition:
1, positive freeze-off time meets or exceeds 30 days, and brine freezing effect reaches to design requirement.
2, speculating that annular Frozen Soil Cylinder effective thickness reaches 1.8 meters according to thermometer hole thermometric, annular Frozen Soil Cylinder is the warmest
Degree reaches-10 DEG C.
3, thermometer hole temperature all reaches subzero.
4, construction emergency preplan is perfect, and has operability.
5, before exchanging shield ventral brush, near the shield ventral brush near annular Frozen Soil Cylinder, position, section of jurisdiction opens two detections respectively
Observation port, anhydrous outflow.
Seven, freezing pipe pulls out technique
(1) forced thaw
The scheme using artificial local to thaw, utilizes hot salt brine to circulate in frigo, makes the frozen soil around freezing pipe melt
Change.
(2) saline heating
With a 3m3The brine tank of left and right stores saline, carries out adding hot salt brine with the heating wire of 6 groups of 20kw, and temperature controls
At 75 ± 10 DEG C.
(3) brine recycling
Utilizing brine pump circulating brine, Model of pump is IS150-125-315, the brine recycling flow control of each freezing hole
System is at 57-m3/h。
(4) defrosting is measured
Utilize the thermometer hole in freezing curtain, every day Timing measurement curtain temperature change, until freezing curtain rises to
Till positive temperature, then stop defrosting operation.
(5) freezing pipe rises and pulls out
After freezing pipe thaws, by compressed air, interior for pipe saline is discharged；Quickly extracting freezing pipe, freezing pipe can not be sprained strength,
Wanting normal micro-rotation freezing pipe during tube drawing, freezing pipe can not pull out firmly, and during as pulled out motionless, hot salt brine to be continued cycling through thaws, until energy
Till pulling up freezing pipe.
Eight, frost heave controls with thaw collapse
Frost heave is because of water freezing and the soil expansion that causes during freezing soil, takes following controlling measurement to freeze in work progress
Swollen
And thaw collapse:
(1) after freezing pipe is extracted, closely knit by freezing hole yellow ground filling in time.
(2) in the thawing stage of frozen soil body, the injected hole of available tunnel duct piece carries out slip casting densification to consolidation by freezing district
Reinforce the freeze thawing soil body.Because the natural melting process of frozen soil body is slow, little pressure, the mode of many notes time is preferably taked to carry out slip casting, note
Slurry pressure is generally 0.2～0.5MPa, and serosity preferably selects single liquid cement mortar.
(3) for pre-anti-freeze expansion and thaw collapse, the freezing unit that design selection standard refrigerating capacity is bigger, at short notice salt
Coolant-temperature gage drops to design load, to accelerate frozen soil development, improves frozen soil strength, reduces frost heave and thaw collapse amount.
(4) grasp and adjust brine temp and brine flow, batch (-type) can be taked if desired to freeze, control frozen soil development
Amount, to reduce frost heave and thaw collapse.
Nine, exchanging shield ventral brush
After actively freezing, the reinforcing stagnant water effect of annular freezing curtain need to be checked, see by opening two detections
The injected hole examining hole or section of jurisdiction checks, determine anhydrous after can implement exchanging shield ventral brush, removing before section of jurisdiction, neighbouring section of jurisdiction
Inner support must be carried out.
Ten, Renewal process
After above-mentioned preparation, tail sealing brush replacing can be carried out；The most normal propelling, is advanced to 1m left
The right side, the welding carrying out pipe lengthens jack, then advances, until first shield tailings is completely exposed.Stop advancing, directly
Carry out whole circle with changing.After changing, measurement and positioning, it is welded with gap of the shield tail pad, carries out pipe sheet assembling, pushing tow with extension arm
Section of jurisdiction is slided, and with upper ring distance 100mm, to hole, wears bolt, pushing tow, the docking of the old and new section of jurisdiction, bolt fastening propelling, and pipe props up
Cut off, as shown in Figure 5 after support abjection.
(1) 3 ring scope lower half circle 2-3 injected holes after shield hoop, and mounting ball valve are reserved when changing shield ventral brush, standby
Leak grouting behind shaft or drift lining or injection polyurethane.
(2) shield ventral brush is exposed, the waste oil removed between shield ventral brush in seal groove and mortar.
(3) shield tail is just checked do not have the shield ventral brush of use value directly to cut off to serious wear, and to cutting off district
Territory carries out polishing process；The wear-resistant relatively light shield ventral brush simply consolidated by mortar is cleared up, and uses Reinforced hook combing during cleaning
Shield ventral brush, the cleaning of shield ventral brush is wanted thoroughly.The part cut off to weld new shield ventral brush again, with Φ 5mm506 welding rod to sealing shield
Ventral brush welds again, and welding quality requires that the spacing between adjacent shield ventral brush is not more than 3mm.To shield ventral brush and shield ventral brush it
Between seal groove again smear tail seal grease of shield.
(4) measuring shield tail surrounding gap record, manufacture and be welded with gap of the shield tail support pipe on tail shield, section of jurisdiction is risen by pipe
To supporting role, it is to avoid section of jurisdiction drops on shield shell, make the gap of the shield tail that section of jurisdiction is identical with a upper ring holding, it is ensured that newly installed ring
Concentric with a upper ring.
(5) installing section of jurisdiction, install section of jurisdiction and follow the order installed from bottom to top, the K block that binds selects II point or I point position.
After erecting ring in whole completes, elapse section of jurisdiction the most backward.Pushing tow erecting ring in whole section of jurisdiction, with a upper ring away from 100mm.In two endless tube sheet phases
Starting to penetrate bolt when 10mm, segment bolt is worn to newly spelling section of jurisdiction from installing section of jurisdiction.When section of jurisdiction puts in place, 10 groups of jack
The most afterburning, in order to two endless tube sheet contacts closely, fasten all bolts of the domain repeatedly.
(6), after section of jurisdiction is installed and put in place, shield tail grease pump to be used pumping tail seal grease of shield, filling is manually smeared uncompacted
Shield ventral brush groove and shield ventral brush.
(7) operating pressure of shield tail grease pump can be set, can stop after reaching setup pressure value.Recover normal to advance,
Behind the supporting steel plate abjection section of jurisdiction of welding, cut off, shield shell is done grinding process.
(8) take soil pressure Conservation measures in changing, prevent body center of gravity from moving forward, cause attitude, gap, shield tail full circle degree to send out
Changing.
(9) points for attention
1, carry out pipe welding at shield driving to about 1m, be normally advanced into after shield ventral brush is completely exposed, stop driving.
The propelling jack of interim pipe holds out against section of jurisdiction not retraction, prevents shield machine from retreating.
2, first by shield ventral brush and the oils and fats of tail sealing cavity, mortar etc. are removed clean.Shield tail grease is injected
Mouth is also carried out cleaning, it is ensured that grease lines unimpeded.
3,2 propelling jack bottom retraction, start to cut off shield ventral brush, and other jack continues to hold out against.The shield tail exposed
After brush cuts off, the cicatrix polishing that shield ventral brush is cut off is clean, starts to weld new shield ventral brush.Weld complete, at new shield ventral brush
On smear shield tail grease.
4, after changing, jack stretches out, holds out against.Retracting 2 propelling jack, repeat the above steps, by bottom again
Order to top is changed, until first shield ventral brush is all changed complete.
(10) section of jurisdiction is installed, recovers driving.After completing a series of activities, segment assembly, measure between shield tail before pipe sheet assembling
Gap, carries out segment selection.Due to stress long-time bottom shield tail, bottom gap of the shield tail is relatively big, and top gap of the shield tail is too small, pipe
When sheet is installed, carry out by first up and then down.After section of jurisdiction completes to install, driving after shield endnote is entered enough oils and fatss, can be recovered.
11, the protective measure after sealing brush is changed
The work of protection sealing brush Tong Bu should be carried out with changing sealing brush.For preventing the damage again of sealing brush, Ying Cai
Take the following precautionary measures:
(1) oils and fats is filled
In order to prevent the damage of sealing brush, increase the effect of sealing simultaneously, during being replaced sealing brush, need
Oils and fats (general employing meets the oils and fats that water is not easily decomposed) is filled in the most by hand to the steel wire of every piece of sealing brush；
(2) sealing brush is put the oil
During section of jurisdiction is reinstalled, spread butter to steel spring plate (one side contacted with section of jurisdiction), increase section of jurisdiction
And the lubrication between steel spring plate.
(3) seal groove fills oils and fats
After having changed sealing brush the most assembled good section of jurisdiction, before shield machine advances, first pass through shield tail injected grease system to close
That seals brush asks injection seal grease.
(4) clear up in time bottom shield shell
When every endless tube sheet is installed in tunneling process, it is necessary to clean out bottom shield shell, prevent rubble be clipped in section of jurisdiction with
Between shield shell, it is damaged to sealing brush along with the rear shifting of section of jurisdiction, avoids shield attitude to suddenly change the most as far as possible.
Above-described embodiment, only for technology design and the feature of the explanation present invention, its object is to allow person skilled in the art
Scholar will appreciate that present disclosure and is carried out, and can not limit the scope of the invention with this, all according to the present invention
The equivalence that spirit is made changes or modifies, and all should contain within the scope of the present invention.
Claims (4)
1. annular consolidation by freezing water sealing structure during an exchanging shield ventral brush, it is characterised in that: described reinforcing water sealing structure is to utilize
Annular freezing pipe construction equipment buries 1～2 annular freezing pipe underground in the soil body needing replacing shield ventral brush position, then uses people
The mode that work is freezed makes the soil body around annular freezing pipe form interim annular Frozen Soil Cylinder and reinforces water sealing structure.
Annular consolidation by freezing water sealing structure during exchanging shield ventral brush the most according to claim 1, it is characterised in that: described annular
Freezing pipe material is usually seamless low carbon steel pipe, it would however also be possible to employ PVC, PPR, ABS, PE plastic tube.
Annular consolidation by freezing water sealing structure during exchanging shield ventral brush the most according to claim 1 and 2, it is characterised in that: described
Annular freezing pipe cross section is circular, it would however also be possible to employ " I-shaped ", " X-shaped ", " T-shaped ", " Y shape " odd-shaped cross section.
4. according to the construction method of annular consolidation by freezing water sealing structure during exchanging shield ventral brush described in any of the above-described claim, its
It is characterised by: specifically include following processing step:
One, technical flow design
Preparation of construction → annular freezing pipe drilling construction → freezing system and temp measuring system install → actively freeze (temperature monitoring)
→ dismounting section of jurisdiction is changed shield ventral brush (maintenance is freezed) → forced thaw → annular freezing pipe and is pulled out (sealing of hole) → grouting behind shaft or drift lining → shield
Structure continues to advance；
Two, freeze design
(1) annular freezing hole is arranged
Outside the section of jurisdiction changing shield ventral brush, 1～2 annular is buried underground on the precalculated position of the soil body by annular freezing pipe construction equipment
Freezing pipe, this annular freezing pipe puts changing the outer soil body generally 1 arrangement of shield ventral brush section of jurisdiction, can cloth in the case of water shutoff requirement height
Put 2 row's annular freezing pipes；
(2) thermometer hole is arranged
The position of thermometer hole is adjusted by the deflection situation according to boring；
Three, refrigerant system design
(1) parameter is chosen
1) annular freezing pipe is preferably selectedSeamless low carbon steel pipe；
2), when using saline coolant media, freezing period outlet brine temp is-28～-30 DEG C, loop brine temp be-25～-
28℃；
3) saline proportion 1.26；
4) brine flow 5m in freezing pipe3/h；
5) freezing pipe heat-sinking capability: 260Kcal/m2.h；
6) loss of refrigeration capacity coefficient: 1.2；
(2) chilling requirement calculates
Freeze chilling requirement to calculate: Q=1.2 π d H K
In formula: H-freezes total length；
D-freezing pipe diameter；
K-freezing pipe coefficient of heat transfer；
(3) Freezing Station setting, Unit Selection and quantity
(4) brine system
1) salt water conduit tube, collection brine distributing ring type selecting:Welded tube processing and fabricating；
2) the total consumption of calcium chloride (80% crystal): 15 tons；
3) brine pump type selecting: select 3 IS150-125-315 type centrifugal water pumps (wherein standby), flow 200m3/ h, electricity
Machine 30kw；
(5) clean water system
1) clear water pipe type selecting:Welded tube processing and fabricating；
2) 8m is selected3Filtered water tank 3；
3) fresh water magnitude of recruitment: 30m3/h；
4) 3 IS150-125-315 type centrifugal water pumps, flow 200m are selected3/ h, motor 30kw；
5) KST-80 type cooling tower 4 is selected；
(6) freezing pipe design
Annular freezing pipe is preferably selectedSeamless low carbon steel pipe, it is possible to select Seamless
Low carbon steel pipe；Feed pipe is selectedSeamless steel pipe；
Four, drill construction technique: boring preparation → freezing hole measurement and positioning → rig installation centering → normally creep into → repetition measurement, inspection
Leakage → single hole completes → holes to terminate；
Five, frozen construction technique: technological process is Operational preparation → foundation construction → the said equipment installation → pressure testing, wrapping insulation
→ fill fluorine, test running → normal operation → exchanging shield ventral brush → remove → withdraw；Also needed to before filling fluorine, test running process into
Row frigo is installed and freezing hole is checked and accepted, and carries out cooling down water supply during filling fluorine, test running；
Following condition whether is met when six, judging exchanging shield ventral brush
(1) actively freeze-off time meets or exceeds 30 days, and brine freezing effect reaches to design requirement；
(2) speculating that annular Frozen Soil Cylinder effective thickness reaches 1.8 meters according to thermometer hole thermometric, annular Frozen Soil Cylinder mean temperature reaches
To-10 DEG C；
(3) thermometer hole temperature all reaches subzero；
(4) construction emergency preplan is perfect, and has operability；
(5), before exchanging shield ventral brush, near the shield ventral brush near annular Frozen Soil Cylinder, position, section of jurisdiction opens two detection sights respectively
Examine hole, anhydrous outflow；
Seven, freezing pipe is pulled out technique and is specifically included following sequence processing step: forced thaw → saline heating → brine recycling →
Measurement → the freezing pipe that thaws rises and pulls out；
Eight, frost heave controls with thaw collapse
(1) after freezing pipe is extracted, closely knit by freezing hole yellow ground filling in time；
(2) in the thawing stage of frozen soil body, the injected hole of available tunnel duct piece carries out slip casting densification reinforcing to consolidation by freezing district
The freeze thawing soil body；Grouting pressure is generally 0.2～0.5MPa；
(3) at short notice brine temp is dropped to design load；
(4) grasp and adjust brine temp and brine flow, batch (-type) can be taked to freeze, control frozen soil development amount；
Nine, exchanging shield ventral brush
The most normal propelling, is advanced to about 1m, and the welding carrying out pipe lengthens jack, then advances, until first shield
Tailings is completely exposed；Stop advancing, directly carry out whole circle with changing；After changing, measurement and positioning, it is welded with gap of the shield tail pad,
Carrying out pipe sheet assembling with extension arm, pushing tow section of jurisdiction is slided, and with upper ring distance 100mm, to hole, wears bolt, pushing tow, Xin Laoguan
Sheet docking, bolt fastening advance, and pipe cuts off after supporting abjection；
(1) reserve 3 ring scope lower half circle 2-3 injected holes after shield hoop, and mounting ball valve when changing shield ventral brush, standby leak
Grouting behind shaft or drift lining or injection polyurethane；
(2) shield ventral brush is exposed, the waste oil removed between shield ventral brush in seal groove and mortar；
(3) shield tail just being checked does not has serious wear the shield ventral brush of use value directly to cut off, and enter cutting off region
Row polishing processes；The wear-resistant relatively light shield ventral brush simply consolidated by mortar is cleared up, and uses Reinforced hook combing shield tail during cleaning
Brush, the cleaning of shield ventral brush is wanted thoroughly；The part cut off to weld new shield ventral brush again, carries out again sealing shield ventral brush with welding rod
Welding, welding quality requires that the spacing between adjacent shield ventral brush is not more than 3mm；To the seal groove weight between shield ventral brush and shield ventral brush
Newly smear tail seal grease of shield；
(4) measuring shield tail surrounding gap record, manufacture and be welded with gap of the shield tail support pipe on tail shield, section of jurisdiction is played and is propped up by pipe
Support effect, it is to avoid section of jurisdiction drops on shield shell, makes the gap of the shield tail that section of jurisdiction is identical with a upper ring holding, it is ensured that newly installed ring is with upper
One ring is concentric；
(5) installing section of jurisdiction, install section of jurisdiction and follow the order installed from bottom to top, the K block that binds selects II point or I point position；When whole
After ring assembly completes, elapse section of jurisdiction the most backward；Pushing tow erecting ring in whole section of jurisdiction, with a upper ring away from 100mm；At two endless tube sheets apart
Starting to penetrate bolt during 10mm, segment bolt is worn to newly spelling section of jurisdiction from installing section of jurisdiction；When section of jurisdiction puts in place, 10 groups of jack are same
Shi Jiali, in order to two endless tube sheet contacts closely, fasten all bolts of the domain repeatedly；
(6) after section of jurisdiction is installed and is put in place, shield tail grease pump to be used pumping tail seal grease of shield, fill and manually smear uncompacted shield tail
Brush groove and shield ventral brush；
(7) operating pressure of shield tail grease pump can be set, can stop after reaching setup pressure value；Recover normal to advance, welding
Supporting steel plate abjection section of jurisdiction after, cut off, shield shell done grinding process；
(8) take soil pressure Conservation measures in changing, prevent body center of gravity from moving forward, cause attitude, gap, shield tail full circle degree to become
Change；
(9) section of jurisdiction is installed, recovers driving；After completing a series of activities, segment assembly, measure gap of the shield tail before pipe sheet assembling, enter
Row segment selection；When section of jurisdiction is installed, carry out by first up and then down；After section of jurisdiction completes to install, can after shield endnote is entered enough oils and fatss
Recover driving；
Ten, the protective measure after sealing brush is changed includes filling oils and fats, sealing brush is put the oil, seal groove fills oils and fats and cleaning shield shell
Bottom.
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| CN201610188081.1A CN105840202B (en) | 2016-03-29 | 2016-03-29 | Annular consolidation by freezing water sealing structure and its construction method when a kind of exchanging shield ventral brush |
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|---|---|---|---|
| CN201610188081.1A CN105840202B (en) | 2016-03-29 | 2016-03-29 | Annular consolidation by freezing water sealing structure and its construction method when a kind of exchanging shield ventral brush |
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| CN105840202B CN105840202B (en) | 2019-09-03 |
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| CN106907155A (en) * | 2017-03-24 | 2017-06-30 | 山东大学 | The prominent water burst film bag slip casting fast plugging device of shield tail and it is provided with the shield machine of the device |
| CN107687344A (en) * | 2017-09-12 | 2018-02-13 | 北京建工土木工程有限公司 | A kind of shield machine exchanging shield ventral brush stretches steel loop, sealing structure and replacing options |
| CN107762522A (en) * | 2017-11-03 | 2018-03-06 | 中国水利水电第十四工程局有限公司 | A kind of pipe ring butt joint auxiliary device and the method for changing shield tail brush |
| CN108240225A (en) * | 2018-02-11 | 2018-07-03 | 南京林业大学 | The freezing system of shield drive end unit and exchanging shield ventral brush method |
| WO2018188531A1 (en) * | 2017-04-10 | 2018-10-18 | 中铁十四局集团有限公司 | Slurry shield tail brush replacement safety protection device and method using liquid nitrogen freezing |
| CN108678774A (en) * | 2018-06-28 | 2018-10-19 | 广东华隧建设集团股份有限公司 | A kind of section of jurisdiction with freezing function |
| CN109184755A (en) * | 2018-11-16 | 2019-01-11 | 海南大学 | A kind of shield tail leakage sealing section of jurisdiction and its construction method |
| CN109707386A (en) * | 2018-12-18 | 2019-05-03 | 上海隧道工程有限公司 | The method of disposable replacement first of shield tail brush of shield machine |
| CN110017142A (en) * | 2019-04-25 | 2019-07-16 | 中铁十二局集团有限公司 | The emergency management method of tunnel safety based on frozen construction |
| CN110966020A (en) * | 2019-11-22 | 2020-04-07 | 福州地铁集团有限公司 | Assembled freezing interface reinforced tunnel segment and construction method |
| CN111594189A (en) * | 2020-04-30 | 2020-08-28 | 中国水利水电第十四工程局有限公司 | Shield tail wrapping and escaping construction method of shield tunneling machine for tunnel construction |
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| CN113565518A (en) * | 2021-07-26 | 2021-10-29 | 中国水利水电第十四工程局有限公司 | Shield active hinge seal replacement method |
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| CN114508358A (en) * | 2022-01-04 | 2022-05-17 | 中交(南京)建设有限公司 | Shield tail brush replacement construction method for water-rich weak sensitive stratum |
| CN114810103A (en) * | 2022-03-23 | 2022-07-29 | 北京交通大学 | Shield tail brush structure of withstand voltage formula |
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| CN106907155A (en) * | 2017-03-24 | 2017-06-30 | 山东大学 | The prominent water burst film bag slip casting fast plugging device of shield tail and it is provided with the shield machine of the device |
| WO2018188531A1 (en) * | 2017-04-10 | 2018-10-18 | 中铁十四局集团有限公司 | Slurry shield tail brush replacement safety protection device and method using liquid nitrogen freezing |
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| CN109184755A (en) * | 2018-11-16 | 2019-01-11 | 海南大学 | A kind of shield tail leakage sealing section of jurisdiction and its construction method |
| CN109707386A (en) * | 2018-12-18 | 2019-05-03 | 上海隧道工程有限公司 | The method of disposable replacement first of shield tail brush of shield machine |
| CN109707386B (en) * | 2018-12-18 | 2020-10-27 | 上海隧道工程有限公司 | Method for replacing first shield tail brush of shield tunneling machine at one time |
| CN110017142A (en) * | 2019-04-25 | 2019-07-16 | 中铁十二局集团有限公司 | The emergency management method of tunnel safety based on frozen construction |
| CN110966020A (en) * | 2019-11-22 | 2020-04-07 | 福州地铁集团有限公司 | Assembled freezing interface reinforced tunnel segment and construction method |
| CN111594189A (en) * | 2020-04-30 | 2020-08-28 | 中国水利水电第十四工程局有限公司 | Shield tail wrapping and escaping construction method of shield tunneling machine for tunnel construction |
| CN111594189B (en) * | 2020-04-30 | 2022-07-05 | 中国水利水电第十四工程局有限公司 | Shield tail wrapping and escaping construction method of shield tunneling machine for tunnel construction |
| CN111963179A (en) * | 2020-08-24 | 2020-11-20 | 中交第三航务工程局有限公司 | Construction method for replacing shield tail brush through freezing reinforcement |
| CN113565518A (en) * | 2021-07-26 | 2021-10-29 | 中国水利水电第十四工程局有限公司 | Shield active hinge seal replacement method |
| CN113565518B (en) * | 2021-07-26 | 2023-06-09 | 中国水利水电第十四工程局有限公司 | Active hinging seal replacement method for shield |
| CN114060038A (en) * | 2021-10-29 | 2022-02-18 | 五邑大学 | Freezing reinforcement device and shield butt joint reinforcement method thereof |
| CN114060038B (en) * | 2021-10-29 | 2024-02-13 | 五邑大学 | Freezing reinforcement device and shield butt joint reinforcement method thereof |
| CN114508358A (en) * | 2022-01-04 | 2022-05-17 | 中交(南京)建设有限公司 | Shield tail brush replacement construction method for water-rich weak sensitive stratum |
| CN114810103A (en) * | 2022-03-23 | 2022-07-29 | 北京交通大学 | Shield tail brush structure of withstand voltage formula |
| CN114810103B (en) * | 2022-03-23 | 2023-07-18 | 北京交通大学 | Withstand voltage formula shield tail brush structure |
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