CN105952458A - Shield tunnel end semispherical freezing wall reinforcement structure and construction method thereof - Google Patents
Shield tunnel end semispherical freezing wall reinforcement structure and construction method thereof Download PDFInfo
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- CN105952458A CN105952458A CN201610187994.1A CN201610187994A CN105952458A CN 105952458 A CN105952458 A CN 105952458A CN 201610187994 A CN201610187994 A CN 201610187994A CN 105952458 A CN105952458 A CN 105952458A
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- freezing
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- pump
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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
Abstract
The invention discloses a shield tunnel end semispherical freezing wall reinforcement structure and a construction method thereof. The shield tunnel end semispherical freezing wall reinforcement structure includes a plurality of pairs of annular freezing pipes; the plurality of pairs of annular freezing pipes are arranged in tunnel door soil of a shield tunnel end work well at intervals; and the plurality of pairs of annular freezing pipes lead to circulation cooling medium and form a semispherical freezing wall reinforcement body having a radius greater than that of the tunnel door in a shield tunnel end stratum. The stratum reinforcement method can be applied to ends rich in water and sand in soft soil areas, and the problem that the conventional reinforcement methods are bad in reinforcement effect in the soft soil areas can be effectively solved; and the economy and the practicality of the artificial freezing technique can be greatly improved in shield tunnel end stratum reinforcement.
Description
Technical field
The present invention relates to a kind of shield tunnel termination ruggedized construction, be specifically related to a kind of shield tunnel termination hemispherical and freeze
Wall ruggedized construction and construction method thereof.
Background technology
It is the key link in shield construction that shield tunnel termination reinforces, and has the biggest engineering construction risk.At shield
During structure export & import, the diaphram wall that will first carry out portal region is abolished, and cuts off all reinforcing bars；Portal abolishes the time of requirement
Very tight, difficulty of construction is big, and portal is the highest to reinforcing body intensity and sealing requirements after abolishing, when consolidation effect is the best, in hole
Door easily occurs when abolishing that shield and portal gap are gushed mud and gushed sand and ground settlement phenomenon, and then jeopardizes neighbouring underground utilities and build
Build the safety of thing.For preventing this type of phenomenon from occurring, it is necessary to select rational shield tunnel termination stratum consolidation processing scheme, with full
Foot intensity and impervious requirement.
The conventional reinforcing mode in shield tunnel termination have deep mixing method, high-pressure rotary spraying method, SMW engineering method, engineering with artificial freezing method,
Slip casting method, plain concrete bored cast-in-situ pile and precipitation method etc..Soil stabilization can use a kind of engineering method or multiple engineering method to combine
Reinforcing means；Reinforcing mode should be according to engineering geological condition, level of ground water, structure buried depth, shield type and diameter, working environment
Select etc. condition, consider the factors such as safety, easy construction, economy, duration simultaneously.
In coastal soft clay area, when particularly stratum, shield tunnel termination is rich aquifer sand layer, conventional chemistry is used to add
Gu means are extremely difficult to engine request, after chemical consolidation, during inspecting hole, usually can be found to have Lou sand phenomenon of seriously leaking.Now, for
Improve shield tunnel end soil body intensity and abundant sealing, it is ensured that shield export & import safety, in rich aquifer sand layer termination frequently with
Engineering with artificial freezing method carries out end soil body reinforcing.
Have for conventional artificial freezing technology as shown in Figure 1 and squeeze into vertical frozen pipe 1 on ground, termination and implement vertically to freeze
Knot is reinforced, or squeezes into horizontal frozen pipe 2 carrying out horizontal consolidation by freezing at excavation portal in active well, conventional the freezing of both
Reinforcing mode all also exist squeeze into freezing soil pipe too much, freeze that chilling requirement freezing process power consumption big, whole is big, frozen swell and melt settlement
Measuring big shortcoming, how finding a kind of energy-efficient shield tunnel termination consolidation by freezing mode is key the most urgently to be resolved hurrily
Problem.
Summary of the invention
For the technical problem of above-mentioned existence, it is an object of the invention to: for the stratum of richness aquifer sand layer termination, soft clay area
Reinforcing mode, can effectively solve the problem that this area's routine reinforcing mode consolidation effect is the best, and substantially increase manual pipe jacking
The economy on technology reinforcing shield tunnel end stratum and practicality, it is ensured that the smooth export & import of shield machine proposes a kind of shield
Tunnel end hemispherical frost wall ruggedized construction and construction method thereof.
The technical solution of the present invention is achieved in that a kind of shield tunnel termination hemispherical frost wall adds consolidation
Structure, including multipair annular freezing pipe；Described multipair annular freezing pipe is respectively separated and is arranged in the active well of shield tunnel termination
At portal in the soil body；Each lead into circulating refrigerant medium at described multipair annular freezing pipe to be formed in stratum, shield tunnel termination
Radius is more than the hemispherical frost wall reinforcing body of portal radius.
Preferably, described annular freezing pipe is seamless low carbon steel pipe or PVC, PPR, ABS, PE plastic tube.
Preferably, it is 3 right that described annular freezing pipe has, and described annular freezing pipe is from portal about 300～400mm.
Preferably, annular freezing pipe is selectedOrSeamless mild steel
Pipe.
Preferably, described circulating refrigerant medium uses saline coolant media, and freezing period outlet brine temp is-28～-30
DEG C, loop brine temp is-25～-28 DEG C.
Preferably, the saline proportion 1.26 of described saline coolant media；Brine flow 5m in described annular freezing pipe3/h。
A kind of shield tunnel termination hemispherical frost wall ruggedized construction construction method that the present invention provides includes following technique
Step: freeze design, refrigerant system design, drilling construction, frozen construction, abolish cell wall and freezing pipe is pulled out,
Described freeze design comprises the following steps that:
(1) Frozen wall thickness design
Freezing curtain thickness is designed by incorporation engineering feature, soil layer condition and job site situation；Hemispherical is freezed
Wall size is determined by portal size, should ensure that and forms the radius hemispherical Frozen Soil Cylinder more than portal radius in the soil body；Frozen soil
Mean temperature takes-10 DEG C, and frozen soil strength index need to carry out laboratory test mensuration.
(2) layout of freezing hole
Annular layout of freezing pipes 3 is right, and freezing pipe is from portal about 300～400mm；
(3) thermometer hole is arranged
Purpose mainly measures the temperature development situation of freezing curtain scope different parts, in order to take to control accordingly to arrange
Execute, it is ensured that the safety of construction；
Described drilling construction comprises the following steps that:
Boring preparation → freezing hole measurement and positioning → rig installation centering → normally creep into → repetition measurement, leak detection → single hole complete
→ boring terminates；Rectify a deviation in real time during normally creeping into；
Described frozen construction includes each rigging up and debugging and construction technology process:
Each rigging up and debugging: (1) Freezing Station is installed；(2) installation of freezing unit；(3) clear, the installation of brine pump；
(4) installation of cooling tower；(5) freezing unit regulation；(6) clear, the debugging of brine pump；
Described construction technology process is: Operational preparation → foundation construction → the said equipment installation and debugging → pressure testing, wrapping are protected
Temperature → fill fluorine, test running → normal operation → shield；Before filling fluorine, test running process, also need to carry out freezing hole test
Receive, need to cool down water supply during filling fluorine, test running；After shield, after removing as used seamless low carbon steel pipe then to need
Withdraw；
Preferably, described clear, the testing and measuring technology of brine pump comprises the steps: to check that pump and pipeline and junction are with or without pine
Dynamic phenomenon；Rotate pump with hands, try that pump shaft rotates the most flexible；Adding bearing lubrication machine oil in bearing body, observing oil level should
In the centerline of oil ga(u)ge, lubricating oil should be changed in time or supplement；Crawl motor, tries that motor steering is the most correct；Start electricity
Machine, when pump run well after, open delivery gauge and, after demonstrating suitable pressure depending on it, be gradually opened gate valve, check simultaneously
Motor load situation；Observe the pump housing and whether pipeline vibrates excessive, want parking checking reason time excessive and process；Control as far as possible
In the scope that the flow of pump processed and lift indicate on label, to ensure that pump operates at best efficiency point, maximum could be obtained
Energy-saving 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
Find that pump has the abnormal sound should parking checking reason immediately.
Due to the utilization of technique scheme, the present invention compared with prior art has the advantage that
The present invention is compared with traditional shield tunnel termination vertical frozen or Horizontal Freezing structure, and freezing pipe materials are big
Big minimizing, freezes chilling requirement and also greatly reduces, and frozen swell and melt settlement amount is the least, is ensureing the same of consolidation effect particularly stagnant water effect
Time, it is greatly saved the energy, thus has preferable economic benefit, there is bigger application value.In addition the present invention is soft
The stratum consolidation mode of richness aquifer sand layer termination, soil district, can effectively solve this area's routine reinforcing mode consolidation effect the best
Problem, and substantially increase economy and the practicality on artificial freezing technology reinforcing shield tunnel end stratum, it is ensured that shield
The smooth export & import of structure machine.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings technical solution of the present invention is described further:
Accompanying drawing 1 is frost wall ruggedized construction schematic diagram used in the prior art；
Accompanying drawing 2 is the hemispherical frost wall ruggedized construction schematic diagram of the present invention；
Accompanying drawing 3 is hemispherical frost wall ruggedized construction construction flow chart in the present invention；
Accompanying drawing 4 is drilling construction flow chart in the present invention；
Accompanying drawing 5 is each rigging up and debugging and construction technology process；
Wherein: 1, vertical frozen pipe；2, horizontal frozen pipe；11, annular freezing pipe；12, hemispherical frost wall；13, shield machine.
Detailed description of the invention
The present invention is described below in conjunction with the accompanying drawings.
Accompanying drawing 1 is frost wall ruggedized construction schematic diagram used in the prior art.
The present invention of the present invention as shown in Figure 2 is that a kind of shield tunnel termination hemispherical frost wall adds consolidation
Structure, is a kind of novel shield tunnel termination ruggedized construction；This invention be at the portal in the active well of shield tunnel termination to
The soil body is squeezed into 3 to annular freezing pipe, by annular freezing pipe 11 in circulating refrigerant medium, finally shield tunnel termination ground
Forming hemispherical frost wall 12 in Ceng, under the protection of hemispherical frost wall 12, shield machine 13 originates smoothly or arrives；Annular is frozen
Knot pipe 11 diameter is generally 108 or 127mm；Annular size is determined by portal size, should ensure that forming radius in the soil body is more than
The hemispherical Frozen Soil Cylinder of portal radius.Freezing pipe material is usually seamless low carbon steel pipe, it would however also be possible to employ PVC, PPR, ABS,
The plastic tubes such as PE；When using plastic tube, shield launching or arrival, without pulling out freezing pipe, can directly cut propelling.
The present invention is compared with traditional shield tunnel termination vertical frozen or Horizontal Freezing structure, and freezing pipe materials are big
Big minimizing, freezes chilling requirement and also greatly reduces, and frozen swell and melt settlement amount is the least, is ensureing the same of consolidation effect particularly stagnant water effect
Time, it is greatly saved the energy, thus has preferable economic benefit, there is bigger application value.
Frozen construction is before shield driving, by the method for artificial cooling, by the aquifer water-bearing stratum in active well end regions
It is frozen into one and closes fluid-tight curtain, be used for pressing with resisting, hydraulic pressure, completely cut off subsoil water, it is ensured that the safety of shield export & import.
First carry out the drilling construction of annular freezing hole, carry out the installation of Freezing Station, annular freezing hole construction simultaneously
After, carry out freezing hole series pipe and heat insulation work.The most actively freeze, calculated by thermometer hole observation, determine
Freeze to meet after portal cuts condition, start to abolish hole cell wall, if freezing pipe is plastic material, then freeze without pulling out annular
Knot pipe, if freezing pipe is low-carbon (LC) seamless steel pipe, then needs first to pull out freezing pipe, carries out shield launching afterwards or arrives propelling, as
Shown in accompanying drawing 3.
One, freeze design
(1) Frozen wall thickness design
Freezing curtain thickness is designed by incorporation engineering feature, soil layer condition and job site situation.Hemispherical is freezed
Wall size is determined by portal size, should ensure that and forms the radius hemispherical Frozen Soil Cylinder more than portal radius in the soil body.Frozen soil
Mean temperature takes-10 DEG C, and frozen soil strength index need to carry out laboratory test mensuration.
(2) layout of freezing hole
Annular layout of freezing pipes 3 is right, and freezing pipe is from portal about 300-400mm.
(3) thermometer hole is arranged
Purpose mainly measures the temperature development situation of freezing curtain scope different parts, in order to take to control accordingly to arrange
Execute, it is ensured that the safety of construction.
Two, refrigerant system design
(1) parameter is chosen
1) annular freezing pipe is preferably selectedSeamless low carbon steel pipe, it is possible to select
Seamless 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 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.
(7) frost wall forms prediction
Rule of thumb, the closure of freezing wall time takes 15 days, and whole positive freeze-off time preferably takes more than 20 days.
Three, drill construction technique
(1) rig type selecting
Use special annular freezing pipe construction equipment.
(2) drilling construction flow process drilling construction as described in accompanying drawing 4 comprises the following steps that:
Boring preparation → freezing hole measurement and positioning → rig installation centering → normally creep into → repetition measurement, leak detection → single hole complete
→ boring terminates；Rectify a deviation in real time during normally creeping into.
Four, frozen construction technique
(1) frozen construction capital equipment
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, as shown in Figure 5, including each rigging up and debugging and construction technology process:
Each rigging up and debugging: (1) Freezing Station is installed；(2) installation of freezing unit；(3) clear, the installation of brine pump；(4)
The installation of cooling tower；(5) freezing unit regulation；(6) clear, the debugging of brine pump.
Described construction technology process is: Operational preparation → foundation construction → the said equipment installation and debugging → pressure testing, wrapping are protected
Temperature → fill fluorine, test running → normal operation → shield；Before filling fluorine, test running process, also need to carry out freezing hole test
Receive, need to cool down water supply during filling fluorine, test running；After shield, after removing as used seamless low carbon steel pipe then to need
Withdraw.
(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 the basis of inspection 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 should be consistent with motor direction of rotation.
Pump intake is unsuitable too high, is higher than about 20cm at the bottom of clear, brine tank.
At clear water pump intake, one filter screen is installed, one filter screen is set in the middle of brine tank, to have prevented foreign material quilt
In suction line.
Check that there is non-loosening phenomenon pump and pipeline and junction；Rotate pump shaft with hands, check that pump shaft rotates the most flexible.
Adding bearing lubrication machine oil in bearing body, observing oil level should be in the centerline of oil ga(u)ge, and lubricating oil should the most more
Change 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.
Cooling tower column foot and basis fixation.
Cooling tower parts, during transport, depositing, it does not allow ballast, must not be exposed to the sun, 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, remains in the dirts such as pipeline, filling surface, water-collecting tray and tower should be cleared up, and be
System rinses.
(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 be filled with from special topping up valve.Refrigerant charge is not enough. and cold can be caused not enough.Refrigeration
Agent charging amount is too much, not only can increase expense, and operation energy consumption etc. may be brought adverse effect.
2) debugging
Main electric-control system can be done simulated action inspection side, 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 be higher 3～5 DEG C than cooling water temperature；Condensation temperature typically should control at about 40 DEG C, cold
Condenser inflow temperature should be below 32 DEG C；
The evaporating temperature of unit should be lower than the leaving water temperature of chilled water 3～4 DEG C, and chilled water leaving water temperature is generally 5～7 DEG C
Left and right.
(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.
Adding bearing lubrication machine oil in bearing body, observing oil level should be in the centerline of oil ga(u)ge, and lubricating oil should the most more
Change or supplement.
Crawl motor, tries that motor steering is the most correct.
Start motor, when pump run well after, open delivery gauge and, after demonstrating suitable pressure depending on it, gradually beat
Open a sluice gate valve, check motor load situation simultaneously.
Observe the pump housing and whether pipeline vibrates excessive, want parking checking reason time excessive and process.
Control in flow and the scope that lift is dated on label of pump as far as possible, to ensure that pump operates at best efficiency point,
The energy-saving effect of maximum could be obtained.
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.
Five, cell wall condition is abolished
Abolish cell wall and must possess following condition:
| Sequence number | Content | Index |
| 1 | Hemispherical frozen soil | >=excavation portal radius |
| 2 | Frozen soil average | ≤-10℃ |
| 3 | Brine temp | -28 DEG C～-30 DEG C |
| 4 | Saline goes to loop | ≤1℃ |
| 5 | Inspecting hole temperature | ≤-2℃ |
Observed by inspecting hole, it is judged that the freezing efficiency of frozen soil wall.After freezing 20 days, cell wall first has before abolishing point on portal
Cloth beat some inspecting holes, to judge the cementing situation of frozen soil and cell wall.The inspecting hole degree of depth should enter in diaphragm wall 10～15cm.So
After, use temperature measurer to measure, it is desirable to each inspecting hole observed temperature have to be lower than-2 DEG C.When by inspecting hole observed temperature and level
Thermometer hole observed temperature judges that frozen soil wall and cell wall are the most cementing can whole breaking cellular walls.
Six, 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 5-7m3/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.Guarantee without exception after, quickly extract freezing pipe.Freeze
Knot pipe can not be sprained strength, wants normal micro-rotation freezing pipe during tube drawing, and freezing pipe can not pull out firmly, during as pulled out motionless, will continue cycling through hot salt
Water thawing, till pulling up freezing pipe.
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 (8)
1. a shield tunnel termination hemispherical frost wall ruggedized construction, it is characterised in that: include multipair annular freezing pipe；Described
Multipair annular freezing pipe is respectively separated at the portal being arranged in the active well of shield tunnel termination in the soil body；In described multipair annular
Freezing pipe each leads into circulating refrigerant medium and forms radius in stratum, shield tunnel termination and freeze more than the hemispherical of portal radius
Knot wall reinforcing body.
Shield tunnel termination the most according to claim 1 hemispherical frost wall ruggedized construction, it is characterised in that: described annular
Freezing pipe is seamless low carbon steel pipe or PVC, PPR, ABS, PE plastic tube.
Shield tunnel termination the most according to claim 1 hemispherical frost wall ruggedized construction, it is characterised in that: described annular
It is 3 right that freezing pipe has, and described annular freezing pipe is from portal about 300～400mm.
Shield tunnel termination the most according to claim 2 hemispherical frost wall ruggedized construction, it is characterised in that: annular is freezed
Pipe is selectedOrSeamless low carbon steel pipe.
Shield tunnel termination the most according to claim 1 hemispherical frost wall ruggedized construction, it is characterised in that: described circulation
Coolant media uses saline coolant media, and freezing period outlet brine temp is-28～-30 DEG C, loop brine temp be-25～-
28℃。
Shield tunnel termination the most according to claim 5 hemispherical frost wall ruggedized construction, it is characterised in that: described saline
The saline proportion 1.26 of coolant media；Brine flow 5m in described annular freezing pipe3/h。
7. a shield tunnel termination hemispherical frost wall ruggedized construction construction method, comprises the following steps that: freeze design,
Refrigerant system design, drilling construction, frozen construction, abolish cell wall and freezing pipe is pulled out, it is characterised in that
Described freeze design comprises the following steps that:
(1) Frozen wall thickness design
Freezing curtain thickness is designed by incorporation engineering feature, soil layer condition and job site situation；Hemispherical frost wall chi
Very little determined by portal size, should ensure that in the soil body, form the radius hemispherical Frozen Soil Cylinder more than portal radius；Frozen soil is average
Temperature takes-10 DEG C, and frozen soil strength index need to carry out laboratory test mensuration.
(2) layout of freezing hole
Annular layout of freezing pipes 3 is right, and freezing pipe is from portal about 300～400mm；
(3) thermometer hole is arranged
Purpose mainly measures the temperature development situation of freezing curtain scope different parts, in order to take corresponding control measure, really
Protect the safety of construction；
Described drilling construction comprises the following steps that:
Boring preparation → freezing hole measurement and positioning → rig installation centering → normally creep into → repetition measurement, leak detection → single hole complete → bore
Hole is terminated；Rectify a deviation in real time during normally creeping into；
Described frozen construction includes each rigging up and debugging and construction technology process:
Each rigging up and debugging: (1) Freezing Station is installed；(2) installation of freezing unit；(3) clear, the installation of brine pump；(4) cooling
The installation of tower；(5) freezing unit regulation；(6) clear, the debugging of brine pump；
Described construction technology process is: Operational preparation → foundation construction → the said equipment installation and debugging → pressure testing, wrapping insulation →
Fill fluorine, test running → normal operation → shield；Before filling fluorine, test running process, carry out freezing hole examination, fill fluorine, examination
Operation process is carried out cool down water supply；After shield, withdraw after removing as used seamless low carbon steel pipe then to need.
A kind of shield tunnel termination the most according to claim 7 hemispherical frost wall ruggedized construction construction method, its feature
It is: described clear, the testing and measuring technology of brine pump comprises the steps: to check that there is non-loosening phenomenon pump and pipeline and junction；With
Hands rotates pump, tries that pump shaft rotates the most flexible；Adding bearing lubrication machine oil in bearing body, observing oil level should be in oil ga(u)ge
At heart line, lubricating oil should be changed in time or supplement；Crawl motor, tries that motor steering is the most correct；Start motor, when pump is normal
After operating, open delivery gauge and, after demonstrating suitable pressure depending on it, be gradually opened gate valve, simultaneously check motor load feelings
Condition；Observe the pump housing and whether pipeline vibrates excessive, want parking checking reason time excessive and process；Control the flow of pump as far as possible
In the scope dated on label with lift, to ensure that pump operates at best efficiency point, the energy-saving effect of maximum could be obtained；Pump
In running, bearing temperature not can exceed that ambient temperature 35 DEG C, and maximum temperature must not exceed 80 DEG C；As found, pump has exception
Sound should parking checking reason immediately.
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| CN201610187994.1A CN105952458A (en) | 2016-03-29 | 2016-03-29 | Shield tunnel end semispherical freezing wall reinforcement structure and construction method thereof |
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| CN105952458A true CN105952458A (en) | 2016-09-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108005663A (en) * | 2017-12-18 | 2018-05-08 | 上海市基础工程集团有限公司 | Export ＆ import exempts from tube drawing consolidation by freezing construction method |
| CN110159274A (en) * | 2019-06-19 | 2019-08-23 | 中铁第六勘察设计院集团有限公司 | A kind of high hydraulic pressure shield tunnel emergency tool-changing mechanism in sea area and construction method |
| CN112159165A (en) * | 2020-10-23 | 2021-01-01 | 中铁二十五局集团有限公司 | Shield freezing and opening material and preparation method thereof |
| CN112502715A (en) * | 2020-11-08 | 2021-03-16 | 上海市隧道工程轨道交通设计研究院 | Temporary plugging and reinforcing method for end of shield tunnel |
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| CN112159165A (en) * | 2020-10-23 | 2021-01-01 | 中铁二十五局集团有限公司 | Shield freezing and opening material and preparation method thereof |
| CN112502715A (en) * | 2020-11-08 | 2021-03-16 | 上海市隧道工程轨道交通设计研究院 | Temporary plugging and reinforcing method for end of shield tunnel |
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