CN204609889U - A kind of shield tunnel termination vertical cup type consolidation by freezing structure - Google Patents
A kind of shield tunnel termination vertical cup type consolidation by freezing structure Download PDFInfo
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- CN204609889U CN204609889U CN201520262421.1U CN201520262421U CN204609889U CN 204609889 U CN204609889 U CN 204609889U CN 201520262421 U CN201520262421 U CN 201520262421U CN 204609889 U CN204609889 U CN 204609889U
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Abstract
The utility model discloses a kind of shield tunnel termination vertical cup type consolidation by freezing structure, vertical cup type consolidation by freezing structure lays " mouth " font ordered series of numbers vertical frozen pipe in the soil body outside the active well of shield tunnel termination, horizontal frozen pipe is set by the soil body bottom of termination active well inherence laying vertical frozen pipe simultaneously, by at vertical frozen pipe and horizontal frozen pipe Inner eycle coolant media, can form vertical cup type frost wall reinforcing body in the soil body outside the active well of shield tunnel termination, reinforcement means is: the first step, freeze design; Second step, refrigerant system design; 3rd step, drilling construction; 4th step, frozen construction; 5th step, abolish cell wall; Pulling out of 6th step, freezing pipe; 7th step, Frost heave and thaw subsidence control.Beneficial effect: be the stratum consolidation mode of rich aquifer sand layer termination, soft clay area, effectively can solve the problem that the conventional reinforcing mode consolidation effect in this area is not good, ensure the smooth export & import of shield machine.
Description
Technical field
The utility model relates to a kind of shield tunnel termination consolidation by freezing structure, particularly a kind of shield tunnel termination vertical cup type consolidation by freezing structure.
Background technology
At present, the reinforcing of shield tunnel termination is the key link in shield construction, has very large engineering construction risk.When shield structure export & import, the diaphragm wall that first will carry out portal region is abolished, and cuts off all reinforcing bars.The time that portal abolishes requirement is very tight, and difficulty of construction is large.Portal abolish rear to reinforcing body intensity and sealing requirements very high, when consolidation effect is not good, very easily occurs that when portal is abolished shield structure and portal gap are gushed mud and gushed sand and ground settlement phenomenon, and then jeopardize the safety of neighbouring underground utilities and building.For preventing this type of phenomenon from occurring, rational shield tunnel termination stratum consolidation processing scheme must be selected, to meet intensity and impervious requirement.In coastal soft clay area, when particularly stratum, shield tunnel termination is rich aquifer sand layer, adopts conventional chemical consolidation means to be difficult to reach engine request, after chemical consolidation, usually can find that there is Lou sand phenomenon of seriously leaking during inspecting hole.Now, for improving shield tunnel end soil body intensity and abundant sealing, ensureing shield structure export & import safety, how selecting stratum reinforcing mode to be the technical issues that need to address in rich aquifer sand layer termination.
Summary of the invention
The purpose of this utility model to carry out in the reinforcing process of shield tunnel termination some ruggedized constructions in the area of rich aquifer sand layer and method is more difficult reaches engine request to solve, the problem of the Lou sand of usually causing seriously leaking and a kind of shield tunnel termination vertical cup type consolidation by freezing structure provided.
The shield tunnel termination vertical cup type consolidation by freezing structure that the utility model provides lays " mouth " font ordered series of numbers vertical frozen pipe in the soil body outside the active well of shield tunnel termination, horizontal frozen pipe is set by the soil body bottom of termination active well inherence laying vertical frozen pipe simultaneously, by at vertical frozen pipe and horizontal frozen pipe Inner eycle coolant media, vertical cup type frost wall reinforcing body can be formed in the soil body outside the active well of shield tunnel termination.
It is equal that the length of the horizontal frozen pipe insertion soil body and vertical frozen pipe plane lay width, and enforcement total length is freezed.
The material of vertical frozen pipe and horizontal frozen pipe is seamless low carbon steel pipe or PVC, PPR, ABS, PE plastic pipe, and the cross section of vertical frozen pipe and horizontal frozen pipe is circular or I-shaped or X-shaped or T-shaped or y-shaped cross-section.
The shield tunnel termination vertical cup type consolidation by freezing method that the utility model provides, its method is as described below:
The first step, freeze design:
(1) Frozen wall thickness design:
Incorporation engineering feature, soil layer condition and job site situation design freezing curtain thickness, and the vertical frozen soil wall thickness near active well space enclosing structure is greater than 1.6m;
1) freezing curtain physical parameter:
Frozen soil average temperature gets-10 DEG C, and frozen soil strength index carries out laboratory test mensuration;
2) reinforcing body size:
Longitudinal length: the sealing thickness of shield structure main frame length+(2-3) B, wherein B is section of jurisdiction width;
Transverse width: shield tunnel both sides 3m;
The degree of depth: implement partial freezing in the depth direction length of shield tunnel vault 3m to arch end 3m, or implement total length and freeze in the depth direction length of ground to arch end 3m;
(2) layout of freezing hole:
Freezing hole is arranged as 1-3 row, and flower arrangement is arranged, pitch of holes is 800mm, and trestle column is 800mm, and the vertical frozen pitch-row of close active well space enclosing structure is from cell wall limit 300-400mm;
(3) thermometer hole is arranged:
The position of deflection situation to thermometer hole according to boring adjusts, and object mainly measures the temperature development situation of freezing curtain scope different parts, to take corresponding control measure, guarantees the safety of constructing;
Second step, refrigerant system design:
(1) parameter choose:
1) the seamless low carbon steel pipe of φ 127 × 4.5mm selected by vertical frozen pipe, and the seamless low carbon steel pipe of φ 108 × 8mm selected by horizontal frozen pipe;
2) adopt salt solution coolant media, freezing period outlet brine temp be-28 ~-30 DEG C, loop brine temp is-25 ~-28 DEG C;
3) salt solution proportion 1.26;
4) brine flow 5m in freezing pipe
3/ h;
5) freezing pipe heat-sinking capability: 260Kcal/m
2.h;
6) loss of refrigeration capacity coefficient: 1.2;
(2) chilling requirement calculates:
Freeze chilling requirement to calculate: Q=1.2 π dHK
In formula: H-freeze 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-YSLGF600 II type screw rod refrigerator two, every platform unit refrigerating capacity 28 × 104Kcal/h, power of motor 220kw;
(4) brine system:
1) salt water conduit tube, collection brine distributing ring type selecting: φ 159 × 5mm welded tube processing and fabricating;
2) the total consumption of calcium chloride (80% crystal): 15 tons;
3) brine pump type selecting: select three IS150-125-315 type centrifugal water pumps, flow 200m
3/ h, motor 30kw;
(5) clean water system:
1) clear water pipe type selecting: φ 133 × 4.5mm welded tube processing and fabricating;
2) 8m is selected
3filtered water tank three;
3) fresh water magnitude of recruitment: 30m
3/ h;
4) three IS150-125-315 type centrifugal water pumps are selected, flow 200m3/h, motor 30kw;
5) KST-80 type cooling tower four is selected;
(6) frost wall forms prediction:
Get freezing curtain development speed 25mm/ days, freezing pipe largest hole spacing gets 800mm, then hand over the circle time to be t1=800/2/25=16 days, the closure of freezing wall time gets 20 days, and whole positive freeze-off time should get more than 30 days;
3rd step, drilling construction:
(1) rig type selecting:
Select XP-30B engineering driller two, join Te Lasi air compressor machine GR200-20 air compressor machine one, adopt percussion drilling technique, adopt setting of casing deviational survey having bored in hole, use Inclination Measurement by Light, adopt JDT-5 type gyrolevel deviational survey to ensure vertical precision of holing if desired;
(2) drilling technique requires:
When creeping into, by the needs of the degree of depth and strata condition, timely increase and decrease drill collar, requirement is accomplished evenly, at the uniform velocity creep into, forbid to neglect and neglect soon slowly, pressure is suddenly big or suddenly small, reasonable grasp rotating speed, pressure and flushing dose, add chi or more bit change time, drilling tool should descend 0.3 ~ 0.5m place cleaning bottom of hole at the bottom of distance hole, brigadier's drilling tool is not parked in a degree of depth and rinses for a long time, during power failure, drilling tool is carried to safety depth, have a power failure more than two hours, drilling tool is all proposed, should often detailed inspection to all drilling tools, bent drill pipe and the excessive drilling rod of wearing and tearing prohibit the use, whole Kong Shiying checks drilling tool total length, and punching is by rock dust emptying, lower pipe again,
Freezing pipe carries out ground combo, measures total length, makes a record, and removes foreign object in pipe during lower pipe, keeps clean, after pressure testing sealing, is tamped by the space soil around freezing pipe in time, prevents mud string hole;
Deflection: the average deviation proportion of freezing hole must not be greater than 5 ‰, the whole pitch of holes of freezing hole is not more than design load, otherwise gives perforations adding, and the depth of frost penetration meets design requirement, and lower length of tube is not less than the design freezing hole degree of depth;
Deviational survey: use light transit to carry out whole hole and pore-forming deviational survey also timely drafting slanting of freezing hole plan view in freezing hole construction process;
4th step, frozen construction:
(1) frozen construction capital equipment:
Total power load 666kw between freezing period, when considering that line voltage distribution loss is larger, whole refrigeration station selects YC3 × 120+2 × 25 low pressure Plastic-sheathed Cable three, freezes unit and corresponding corollary equipment respectively for two;
(3) Freezing Station is installed:
Freezing Station is arranged in side, and two units are installed in parallel, can be mutually for subsequent use;
(4) installation of freezing unit:
1) in place and fixing:
According to Freezing Station arrangement diagram, after in place for freezing unit, be fixed with bolt and basis, carry out levelling with spirit level to unit time fixing, by constantly adjusting parallels by unit leveling, according to the line arrangement at scene, adjustment condenser two epicranial plate, has reached the object optimizing line arrangement flexibly, unit starting cabinet is reliably arranged in unit side, be beneficial to easy to operate position, between unit, leave certain space, Operation and Maintenance is at ordinary times brought convenience;
2) pipeline connects:
Saline line and adopt Flange joint between clear water pipeline and unit, reasonably will arrange mounted valve, be beneficial to and open and close operation at ordinary times, provide convenience again to the stubborn bolt etc. when safeguarding;
3) unit sealing detection:
Freezing unit will ensure that the sealing performance of unit is reliable, first carries out the leak detection of refrigeration system, is guaranteeing that system is without after rushing down leakage, then fills fluorine and refuel;
4) unit refuels:
Check the amount of refrigerator oil in unit, if very few, will refuel to unit, freezing unit selects 46# refrigerator oil;
(5) clearly, the installation of brine pump:
Check water pump and motor, guarantee not damage in transportation and handling procedure, checking tool and lifting appliance, and the basis of inspection machine, the basic plane of installation pump wants level, the levelness of whole unit is reexamined after placing, suction line and the pipeline that spues of pump will have respective support, pipe weight is not allowed directly to be born by pump, pump shaft should be consistent with motor direction of rotation, the position of pump intake 20cm at the bottom of distance brine tank, installs one filter screen at clear water pump intake, in the middle of brine tank, arranges one filter screen;
(6) installation of cooling tower:
Fire Hazard Area is wanted in cooling tower installation process, forbid to use electric welding or gas cutting naked light at tower body and vicinity thereof, personnel's smoking on the scene is not allowed yet, when employing naked light, take corresponding safety measure, cooling tower basis will keep level, require that pillar is vertical with basal plane, each basal plane discrepancy in elevation is no more than ± 1mm, center to center distance tolerance is ± 2mm, when tower body is assembled, bolt symmetry is fastening, distortion by force is not allowed to install, must not leak after assembled, cooling tower column foot and basic fixation, cooling tower enters, outlet pipe and supplementary water pipe arrange support of pipelines separately, avoid pipeline weight transmitting tower body, fan blade is kept properly, prevent distortion, after cooling tower installs, pipeline should be cleared up, filling surface, remains in the dirt of water-collecting tray and tower, and carry out system flushing,
(7) freezing unit regulation:
Before refrigeration system debugging, carry out the clean of internal system and dry work;
1) cold-producing medium is filled:
After in-site installation, if find that cold-producing medium has leaked or not enough, leakage point be found out and get rid of leakage phenomenon, then adding cold-producing medium, when filling, can directly be filled with from special topping up valve;
2) debug:
In debug process, should be specifically noted that following some:
Check whether the valve everywhere in refrigeration system is in normal opening, particularly discharge line valve, and open, open the cooling water valve of condenser and the Cold water tap of evaporimeter, the flow of cold water and cooling water will meet machine set technology requirement;
3) run
According to the requirement of refrigerator operational procedure, start unit, the safety guard installed in proper use of refrigeration system, will change in time if any damage;
4) exception monitoring
What screw type refrigerating compressor normally ran is masked as:
Compressor Discharge Pressure is 0.8 ~ 1.5MPa (gauge pressure);
Compressor exhaust temperature is 45 ~ 90 DEG C;
The oil temperature of compressor is 40 ~ 55 DEG C;
The oil pressure of compressor is 0.2 ~ 0.3MPa (gauge pressure);
In compressor operating process, sound should evenly, steadily, sound without exception;
The condensation temperature of unit is higher than cooling water temperature 3 ~ 5 DEG C; Condensation temperature controls at 40 DEG C, and condenser inflow temperature should below 32 DEG C;
The evaporating temperature of unit is 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;
(8) related preparations standard:
Freeze machine oil and select N46 refrigerator oil;
Freon R-22 selected by cold-producing medium;
Refrigerant agent selects calcium chloride solution;
5th step, abolish cell wall:
Abolish cell wall and must possess following condition:
Frozen soil wall thickness >=1.6m;
Average temperature≤-10 DEG C of frozen soil;
Brine temp-28 DEG C ~-30 DEG C;
Salt solution go loop temperature poor≤2 DEG C;
Inspecting hole temperature≤-2 DEG C;
Observed by inspecting hole, judge the freezing efficiency of frozen soil wall, after freezing 30 days, what cell wall first had a distribution on portal before abolishing beats several inspecting hole, to judge the cementing situation of frozen soil and cell wall, the inspecting hole degree of depth enters 10 ~ 15cm in diaphragm wall, then adopts temperature measurer to measure, each inspecting hole observed temperature must lower than-2 DEG C, when judged by inspecting hole observed temperature and horizontal thermometer hole observed temperature frozen soil wall and cell wall completely reliably cementing after whole broken wall again;
Pulling out of 6th step, freezing pipe:
(1) forced thaw:
The scheme adopting artificial local to thaw, utilizes hot salt brine to circulate in frigo, the frozen soil around freezing pipe is melted;
(2) salt solution heating:
With a 3m
3the brine tank of left and right stores salt solution, and carry out heated saline with the heating wire of six groups of 20kw, temperature controls at 75 ± 10 DEG C;
(3) brine recycling:
Utilize brine pump circulating brine, Model of pump is IS150-125-315, and the brine recycling flow-control of each freezing hole is at 5-7m3/h;
(4) to thaw measurement:
Utilize the thermometer hole in freezing curtain, every day Timing measurement curtain temperature change, till freezing curtain rises to positive temperature, then stop thawing operation;
(5) freezing pipe rises and pulls out:
After freezing pipe thaws, in managing with compressed air, salt solution is discharged, and adopts crane to carry out examination and pulls out, when pulling up 0.5m, guarantee without exception after, extract freezing pipe fast, tube drawing notices that freezing pipe and hook want being aligned, freezing pipe can not be sprained strength, want normal micro-rotation freezing pipe during tube drawing, freezing pipe can not pull out firmly, during as pulled out motionless, continue cycling hot salt solution to thaw, till pulling up freezing pipe;
7th step, Frost heave and thaw subsidence control:
Frost heave is the soil expansion caused because of water freezing during freezing soil, takes following controlling measurement frost-heaving and thawing in work progress:
(1) after freezing pipe is extracted, closely knit by freezing the filling of hole yellow ground in time;
(2) in the thawing stage of frozen soil body, the injected hole of tunnel duct piece can be utilized to consolidation by freezing district to carry out slip casting densification and to reinforce the freeze thawing soil body, because the natural melting process of frozen soil body is slow, the secondary mode of little pressure, many notes is taked to carry out slip casting, grouting pressure is 0.2 ~ 0.5MPa, and slurries select single liquid cement paste;
(3) in order to prevent frost-heaving and thawing, the freezing unit that design selection standard refrigerating capacity is larger, drops to design load brine temp at short notice, to accelerate frozen soil development, improves frozen soil strength, reduces frost-heaving and thawing amount;
(4) grasp and adjust brine temp and brine flow, batch (-type) can be taked if desired to freeze, controlling frozen soil development amount, to reduce frost-heaving and thawing.
The beneficial effects of the utility model:
The utility model is a kind of shield tunnel termination vertical cup type consolidation by freezing mode, is a kind of novel shield tunnel termination reinforcing mode.This invention is the stratum consolidation mode of rich aquifer sand layer termination, soft clay area, effectively can solve the problem that the conventional reinforcing mode consolidation effect in this area is not good, ensure the smooth export & import of shield machine.
Accompanying drawing explanation
Fig. 1 is the front view of ruggedized construction described in the utility model.
Fig. 2 is the first form top view of ruggedized construction described in the utility model.
Fig. 3 is the second form top view of ruggedized construction described in the utility model.
Fig. 4 is frozen construction process chart described in the utility model.
1, active well 2, vertical frozen pipe 3, horizontal frozen pipe 4, the soil body
5, vertical cup type frost wall reinforcing body 6, shield structure main frame.
Detailed description of the invention
Refer to shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4:
The shield tunnel termination vertical cup type consolidation by freezing structure that the utility model provides lays " mouth " font ordered series of numbers vertical frozen pipe 2 in the soil body 4 outside shield tunnel termination active well 1, vertical frozen pipe 2 cloth is set to the laying form of " mouth " font or two " mouth " fonts, horizontal frozen pipe 3 is set by the soil body 4 bottom of termination active well 1 inherence laying vertical frozen pipe 2 simultaneously, by at vertical frozen pipe 2 and horizontal frozen pipe 3 Inner eycle coolant media, vertical cup type frost wall reinforcing body 5 can be formed in the soil body 4 outside shield tunnel termination active well 1.
It is equal that the length that horizontal frozen pipe 3 inserts the soil body 4 and vertical frozen pipe 2 plane lay width, implements total length and freeze.
The material of vertical frozen pipe 2 and horizontal frozen pipe 3 is seamless low carbon steel pipe or PVC, PPR, ABS, PE plastic pipe, and the cross section of vertical frozen pipe and horizontal frozen pipe is circular or I-shaped or X-shaped or T-shaped or y-shaped cross-section.
The shield tunnel termination vertical cup type consolidation by freezing method that the utility model provides, its method is as described below:
The first step, freeze design:
(1) Frozen wall thickness design:
Incorporation engineering feature, soil layer condition and job site situation design freezing curtain thickness, and the vertical frozen soil wall thickness near active well 1 space enclosing structure is greater than 1.6m;
1) freezing curtain physical parameter:
Frozen soil average temperature gets-10 DEG C, and frozen soil strength index carries out laboratory test mensuration;
2) reinforcing body size:
Longitudinal length: the sealing thickness of shield structure main frame 6 length+(2-3) B, wherein B is section of jurisdiction width;
Transverse width: shield tunnel both sides 3m;
The degree of depth: implement partial freezing in the depth direction length of shield tunnel vault 3m to arch end 3m, or implement total length and freeze in the depth direction length of ground to arch end 3m;
(2) layout of freezing hole:
Freezing hole is arranged as 1-3 row, and flower arrangement is arranged, pitch of holes is 800mm, and trestle column is 800mm, and the vertical frozen pitch-row of close active well space enclosing structure is from cell wall limit 300-400mm;
(3) thermometer hole is arranged:
The position of deflection situation to thermometer hole according to boring adjusts, and object mainly measures the temperature development situation of freezing curtain scope different parts, to take corresponding control measure, guarantees the safety of constructing;
Second step, refrigerant system design:
(1) parameter choose:
1) the seamless low carbon steel pipe of φ 127 × 4.5mm selected by vertical frozen pipe 2, and the seamless low carbon steel pipe of φ 108 × 8mm selected by horizontal frozen pipe 3;
2) adopt salt solution coolant media, freezing period outlet brine temp be-28 ~-30 DEG C, loop brine temp is-25 ~-28 DEG C;
3) salt solution proportion 1.26;
4) brine flow 5m in freezing pipe
3/ h;
5) freezing pipe heat-sinking capability: 260Kcal/m
2.h;
6) loss of refrigeration capacity coefficient: 1.2;
(2) chilling requirement calculates:
Freeze chilling requirement to calculate: Q=1.2 π dHK
In formula: H-freeze 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-YSLGF600 II type screw rod refrigerator two, every platform unit refrigerating capacity 28 × 104Kcal/h, power of motor 220kw;
(4) brine system:
1) salt water conduit tube, collection brine distributing ring type selecting: φ 159 × 5mm welded tube processing and fabricating;
2) the total consumption of calcium chloride (80% crystal): 15 tons;
3) brine pump type selecting: select three IS150-125-315 type centrifugal water pumps, flow 200m
3/ h, motor 30kw;
(5) clean water system:
1) clear water pipe type selecting: φ 133 × 4.5mm welded tube processing and fabricating;
2) 8m is selected
3filtered water tank three;
3) fresh water magnitude of recruitment: 30m
3/ h;
4) three IS150-125-315 type centrifugal water pumps are selected, flow 200m3/h, motor 30kw;
5) KST-80 type cooling tower four is selected;
(6) frost wall forms prediction:
Get freezing curtain development speed 25mm/ days, freezing pipe largest hole spacing gets 800mm, then hand over the circle time to be t1=800/2/25=16 days, the closure of freezing wall time gets 20 days, and whole positive freeze-off time should get more than 30 days;
3rd step, drilling construction:
(1) rig type selecting:
Select XP-30B engineering driller two, join Te Lasi air compressor machine GR200-20 air compressor machine one, adopt percussion drilling technique, adopt setting of casing deviational survey having bored in hole, use Inclination Measurement by Light, adopt JDT-5 type gyrolevel deviational survey to ensure vertical precision of holing if desired;
(2) drilling technique requires:
When creeping into, by the needs of the degree of depth and strata condition, timely increase and decrease drill collar, requirement is accomplished evenly, at the uniform velocity creep into, forbid to neglect and neglect soon slowly, pressure is suddenly big or suddenly small, reasonable grasp rotating speed, pressure and flushing dose, add chi or more bit change time, drilling tool should descend 0.3 ~ 0.5m place cleaning bottom of hole at the bottom of distance hole, brigadier's drilling tool is not parked in a degree of depth and rinses for a long time, during power failure, drilling tool is carried to safety depth, have a power failure more than two hours, drilling tool is all proposed, should often detailed inspection to all drilling tools, bent drill pipe and the excessive drilling rod of wearing and tearing prohibit the use, whole Kong Shiying checks drilling tool total length, and punching is by rock dust emptying, lower pipe again,
Freezing pipe carries out ground combo, measures total length, makes a record, and removes foreign object in pipe during lower pipe, keeps clean, after pressure testing sealing, is tamped by the space soil around freezing pipe in time, prevents mud string hole;
Deflection: the average deviation proportion of freezing hole must not be greater than 5 ‰, the whole pitch of holes of freezing hole is not more than design load, otherwise gives perforations adding, and the depth of frost penetration meets design requirement, and lower length of tube is not less than the design freezing hole degree of depth;
Deviational survey: use light transit to carry out whole hole and pore-forming deviational survey also timely drafting slanting of freezing hole plan view in freezing hole construction process;
4th step, frozen construction:
(1) frozen construction capital equipment:
Total power load 666kw between freezing period, when considering that line voltage distribution loss is larger, whole refrigeration station selects YC3 × 120+2 × 25 low pressure Plastic-sheathed Cable three, freezes unit and corresponding corollary equipment respectively for two;
(3) Freezing Station is installed:
Freezing Station is arranged in side, and two units are installed in parallel, can be mutually for subsequent use;
(4) installation of freezing unit:
1) in place and fixing:
According to Freezing Station arrangement diagram, after in place for freezing unit, be fixed with bolt and basis, carry out levelling with spirit level to unit time fixing, by constantly adjusting parallels by unit leveling, according to the line arrangement at scene, adjustment condenser two epicranial plate, has reached the object optimizing line arrangement flexibly, unit starting cabinet is reliably arranged in unit side, be beneficial to easy to operate position, between unit, leave certain space, Operation and Maintenance is at ordinary times brought convenience;
2) pipeline connects:
Saline line and adopt Flange joint between clear water pipeline and unit, reasonably will arrange mounted valve, be beneficial to and open and close operation at ordinary times, provide convenience again to the stubborn bolt etc. when safeguarding;
3) unit sealing detection:
Freezing unit will ensure that the sealing performance of unit is reliable, first carries out the leak detection of refrigeration system, is guaranteeing that system is without after rushing down leakage, then fills fluorine and refuel;
4) unit refuels:
Check the amount of refrigerator oil in unit, if very few, will refuel to unit, freezing unit selects 46# refrigerator oil;
(5) clearly, the installation of brine pump:
Check water pump and motor, guarantee not damage in transportation and handling procedure, checking tool and lifting appliance, and the basis of inspection machine, the basic plane of installation pump wants level, the levelness of whole unit is reexamined after placing, suction line and the pipeline that spues of pump will have respective support, pipe weight is not allowed directly to be born by pump, pump shaft should be consistent with motor direction of rotation, the position of pump intake 20cm at the bottom of distance brine tank, installs one filter screen at clear water pump intake, in the middle of brine tank, arranges one filter screen;
(6) installation of cooling tower:
Fire Hazard Area is wanted in cooling tower installation process, forbid to use electric welding or gas cutting naked light at tower body and vicinity thereof, personnel's smoking on the scene is not allowed yet, when employing naked light, take corresponding safety measure, cooling tower basis will keep level, require that pillar is vertical with basal plane, each basal plane discrepancy in elevation is no more than ± 1mm, center to center distance tolerance is ± 2mm, when tower body is assembled, bolt symmetry is fastening, distortion by force is not allowed to install, must not leak after assembled, cooling tower column foot and basic fixation, cooling tower enters, outlet pipe and supplementary water pipe arrange support of pipelines separately, avoid pipeline weight transmitting tower body, fan blade is kept properly, prevent distortion, after cooling tower installs, pipeline should be cleared up, filling surface, remains in the dirt of water-collecting tray and tower, and carry out system flushing,
(7) freezing unit regulation:
Before refrigeration system debugging, carry out the clean of internal system and dry work;
1) cold-producing medium is filled:
After in-site installation, if find that cold-producing medium has leaked or not enough, leakage point be found out and get rid of leakage phenomenon, then adding cold-producing medium, when filling, can directly be filled with from special topping up valve;
2) debug:
In debug process, should be specifically noted that following some:
Check whether the valve everywhere in refrigeration system is in normal opening, particularly discharge line valve, and open, open the cooling water valve of condenser and the Cold water tap of evaporimeter, the flow of cold water and cooling water will meet machine set technology requirement;
3) run
According to the requirement of refrigerator operational procedure, start unit, the safety guard installed in proper use of refrigeration system, will change in time if any damage;
4) exception monitoring
What screw type refrigerating compressor normally ran is masked as:
Compressor Discharge Pressure is 0.8 ~ 1.5MPa (gauge pressure);
Compressor exhaust temperature is 45 ~ 90 DEG C;
The oil temperature of compressor is 40 ~ 55 DEG C;
The oil pressure of compressor is 0.2 ~ 0.3MPa (gauge pressure);
In compressor operating process, sound should evenly, steadily, sound without exception;
The condensation temperature of unit is higher than cooling water temperature 3 ~ 5 DEG C; Condensation temperature controls at 40 DEG C, and condenser inflow temperature should below 32 DEG C;
The evaporating temperature of unit is 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;
(8) related preparations standard:
Freeze machine oil and select N46 refrigerator oil;
Freon R-22 selected by cold-producing medium;
Refrigerant agent selects calcium chloride solution;
5th step, abolish cell wall:
Abolish cell wall and must possess following condition:
Frozen soil wall thickness >=1.6m;
Average temperature≤-10 DEG C of frozen soil;
Brine temp-28 DEG C ~-30 DEG C;
Salt solution go loop temperature poor≤2 DEG C;
Inspecting hole temperature≤-2 DEG C;
Observed by inspecting hole, judge the freezing efficiency of frozen soil wall, after freezing 30 days, what cell wall first had a distribution on portal before abolishing beats several inspecting hole, to judge the cementing situation of frozen soil and cell wall, the inspecting hole degree of depth enters 10 ~ 15cm in diaphragm wall, then adopts temperature measurer to measure, each inspecting hole observed temperature must lower than-2 DEG C, when judged by inspecting hole observed temperature and horizontal thermometer hole observed temperature frozen soil wall and cell wall completely reliably cementing after whole broken wall again;
Pulling out of 6th step, freezing pipe:
(1) forced thaw:
The scheme adopting artificial local to thaw, utilizes hot salt brine to circulate in frigo, the frozen soil around freezing pipe is melted;
(2) salt solution heating:
With a 3m
3the brine tank of left and right stores salt solution, and carry out heated saline with the heating wire of six groups of 20kw, temperature controls at 75 ± 10 DEG C;
(3) brine recycling:
Utilize brine pump circulating brine, Model of pump is IS150-125-315, and the brine recycling flow-control of each freezing hole is at 5-7m3/h;
(4) to thaw measurement:
Utilize the thermometer hole in freezing curtain, every day Timing measurement curtain temperature change, till freezing curtain rises to positive temperature, then stop thawing operation;
(5) freezing pipe rises and pulls out:
After freezing pipe thaws, in managing with compressed air, salt solution is discharged, and adopts crane to carry out examination and pulls out, when pulling up 0.5m, guarantee without exception after, extract freezing pipe fast, tube drawing notices that freezing pipe and hook want being aligned, freezing pipe can not be sprained strength, want normal micro-rotation freezing pipe during tube drawing, freezing pipe can not pull out firmly, during as pulled out motionless, continue cycling hot salt solution to thaw, till pulling up freezing pipe;
7th step, Frost heave and thaw subsidence control:
Frost heave is the soil expansion caused because of water freezing during freezing soil, takes following controlling measurement frost-heaving and thawing in work progress:
(1) after freezing pipe is extracted, closely knit by freezing the filling of hole yellow ground in time;
(2) in the thawing stage of frozen soil body, the injected hole of tunnel duct piece can be utilized to consolidation by freezing district to carry out slip casting densification and to reinforce the freeze thawing soil body, because the natural melting process of frozen soil body is slow, the secondary mode of little pressure, many notes is taked to carry out slip casting, grouting pressure is 0.2 ~ 0.5MPa, and slurries select single liquid cement paste;
(3) in order to prevent frost-heaving and thawing, the freezing unit that design selection standard refrigerating capacity is larger, drops to design load brine temp at short notice, to accelerate frozen soil development, improves frozen soil strength, reduces frost-heaving and thawing amount;
(4) grasp and adjust brine temp and brine flow, batch (-type) can be taked if desired to freeze, controlling frozen soil development amount, to reduce frost-heaving and thawing.
Claims (4)
1. a shield tunnel termination vertical cup type consolidation by freezing structure, it is characterized in that: be in the soil body outside the active well of shield tunnel termination, lay " mouth " font ordered series of numbers vertical frozen pipe, horizontal frozen pipe is set by the soil body bottom of termination active well inherence laying vertical frozen pipe simultaneously, by at vertical frozen pipe and horizontal frozen pipe Inner eycle coolant media, vertical cup type frost wall reinforcing body can be formed in the soil body outside the active well of shield tunnel termination.
2. a kind of shield tunnel termination according to claim 1 vertical cup type consolidation by freezing structure, is characterized in that: described vertical frozen pipe cloth is set to the laying form of " mouth " font or two " mouth " fonts.
3. a kind of shield tunnel termination according to claim 1 vertical cup type consolidation by freezing structure, is characterized in that: it is equal that the length of the described horizontal frozen pipe insertion soil body and vertical frozen pipe plane lay width, and enforcement total length is freezed.
4. a kind of shield tunnel termination according to claim 1 vertical cup type consolidation by freezing structure, it is characterized in that: described vertical frozen pipe and the material of horizontal frozen pipe are seamless low carbon steel pipe or PVC, PPR, ABS, PE plastic pipe, the cross section of vertical frozen pipe and horizontal frozen pipe is circular or I-shaped or X-shaped or T-shaped or y-shaped cross-section.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104790961A (en) * | 2015-04-27 | 2015-07-22 | 海南大学 | Vertical cup type freezing reinforcement structure and method at shield tunnel end |
| CN105952458A (en) * | 2016-03-29 | 2016-09-21 | 中铁时代建筑设计院有限公司 | Shield tunnel end semispherical freezing wall reinforcement structure and construction method thereof |
| CN108071400A (en) * | 2016-11-10 | 2018-05-25 | 上海宝冶集团有限公司 | Horizontal freezing consolidation combines shield driving construction method with steel jacket box |
| CN109505614A (en) * | 2019-01-09 | 2019-03-22 | 海南大学 | A kind of shield machine directly promotes the construction method by boulder |
| CN110939453A (en) * | 2019-12-20 | 2020-03-31 | 中铁隧道局集团有限公司 | Cutter real-time monitoring system and normal-pressure cutter changing method |
| CN111677518A (en) * | 2020-07-08 | 2020-09-18 | 北京建工土木工程有限公司 | Shield receiving end reinforcing structure, reinforcing method and shield receiving method |
| CN112030938A (en) * | 2020-09-03 | 2020-12-04 | 海南大学 | Artificial stratum freezing system and method adopting combined refrigeration of liquid nitrogen and saline water |
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2015
- 2015-04-27 CN CN201520262421.1U patent/CN204609889U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104790961A (en) * | 2015-04-27 | 2015-07-22 | 海南大学 | Vertical cup type freezing reinforcement structure and method at shield tunnel end |
| CN105952458A (en) * | 2016-03-29 | 2016-09-21 | 中铁时代建筑设计院有限公司 | Shield tunnel end semispherical freezing wall reinforcement structure and construction method thereof |
| CN108071400A (en) * | 2016-11-10 | 2018-05-25 | 上海宝冶集团有限公司 | Horizontal freezing consolidation combines shield driving construction method with steel jacket box |
| CN109505614A (en) * | 2019-01-09 | 2019-03-22 | 海南大学 | A kind of shield machine directly promotes the construction method by boulder |
| CN110939453A (en) * | 2019-12-20 | 2020-03-31 | 中铁隧道局集团有限公司 | Cutter real-time monitoring system and normal-pressure cutter changing method |
| CN110939453B (en) * | 2019-12-20 | 2021-01-29 | 中铁隧道局集团有限公司 | Cutter real-time monitoring system and normal-pressure cutter changing method |
| CN111677518A (en) * | 2020-07-08 | 2020-09-18 | 北京建工土木工程有限公司 | Shield receiving end reinforcing structure, reinforcing method and shield receiving method |
| CN111677518B (en) * | 2020-07-08 | 2022-05-13 | 北京建工土木工程有限公司 | Shield receiving end reinforcing structure, reinforcing method and shield receiving method |
| CN112030938A (en) * | 2020-09-03 | 2020-12-04 | 海南大学 | Artificial stratum freezing system and method adopting combined refrigeration of liquid nitrogen and saline water |
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