CN204627614U - A kind of high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system - Google Patents
A kind of high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system Download PDFInfo
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- CN204627614U CN204627614U CN201520057861.3U CN201520057861U CN204627614U CN 204627614 U CN204627614 U CN 204627614U CN 201520057861 U CN201520057861 U CN 201520057861U CN 204627614 U CN204627614 U CN 204627614U
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Abstract
A kind of high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system.This system comprises liquid nitrogen storage tank, main gate valve, feed pipe, distributor, liquid distribution pipe, freezing pipe, discharge, stack, thermometer hole, cold type pipe, liquid nitrogen storage tank is connected with the feed pipe that main gate valve is housed, feed pipe divides two-way to be connected with distributor respectively, each distributor divides 8-10 branch road, each branch road is connected with one group of freezing pipe of connecting by liquid distribution pipe, often organize last root freezing pipe to be connected with discharge, be connected with stack by discharge, stack will vaporize nitrogen discharge in air, cold type pipe front end is connected with liquid distribution pipe, end is connected with discharge, the utility model is suitable for high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing engineering, there is formation frost wall speed fast, intensity is high, nontoxic pollution-free, safe and reliable, the advantages such as easy construction.
Description
Technical field
The utility model relates to a kind of high hydraulic pressure extra long distance and get over river (sea) large cross-section tunnel liquid nitrogen freezing system, belong to shield tunnel reinforcing technique field.
Background technology
Along with shield construction method is at subway, cross the extensive use in tunnel over strait, river, under the water-bearing with high pressure condition that soft stratum and water pressure are 0.4MPa ~ 0.7MPa, more than the extra long distance of 1000m, diameter is that the engineering problem run in 14 ~ 16m big cross section shield-tunneling construction is more and more outstanding, wherein shield tail seepage prevention and treatment and control and exchanging shield ventral brush are more construction Difficulties in the traffic tunnel engineering over strait of river, if shield tail spillage is serious, otch hydraulic pressure will be caused to decline, cutterhead front sediment failure, and will deposit in tunnel mud in a large number, if pump drainage not in time, shield machine will be caused to be submerged, therefore, shield structure is being grown apart from continuous tunneling process, need the working environment that airtight, the existence of shield tail wire brush and shield tail grouting plate, effectively cut off the pipelined channel between shield machine and stratum, block water bearing ground to the seepage in shield machine, thus ensure that the safety driving of shield machine.
Tail sealing brush generally adopts multilayer wire brush, and the gap pressurization between wire brush injects seal grease as filling to increase sealing effectiveness.The sealing effectiveness sealing brush in actual shield-tunneling construction can weaken gradually, its reason mainly contain following some: seal grease insufficient infusion; Shield machine adjustment attitude is too quickly; The damaged cement block in ring plate back or other hard foreign matters enter space between sealing brush; Tunnel distance is oversize; When slurry shield stops tunneling, section of jurisdiction assembling causes shield tail to retreat, and causing the motion that shield ventral brush is contrary with there is bristle direction between section of jurisdiction, making bristle warp, and shield ventral brush is out of shape.
According to engineering practice in the past, the freezing system adopted adopts following several usually:
(1) slip casting method
The method strengthens tail sealing stagnant water effect by strengthening shield tail synchronous grouting amount and changing slip casting proportioning to accelerate the measures such as grout cures, there is many unfavorable factors in slip casting method, as the poor continuity of stratum inadaptability, grouting curtain, lack of homogeneity, the slip casting soil body and shield structure and the cementing of section of jurisdiction lack flexible and toughness etc., grouting seal water poor reliability.
(2) brine freezing
Brine freezing system utilizes brine freezing system to make Freezing stratum as rapid.Brine freezing system installs freezing equipment on ground, adopts ammonia (NH
3) or freon be cold-producing medium, by refrigerant agent calcium chloride (CaCl
2) solution (practise claim salt solution) is cooled to-20 ~-30 DEG C, with circulation pump and the polyvinyl chloride feed pipe being inserted to freezing pipe depths, salt solution is sent into freezing pipe, heat outside hypothermic saline continuously for a long time suction pipe, surrounding formation is freezed, after the heat on stratum drawn by salt solution, temperature rises, under the effect of circulation pump, get back to freezing equipment and refrigerant contact through loop pipe and again cool, originally be liquid ammonia or freon, after absorbing the heat of salt solution at reduced pressure during evaporation, compressed and condensation makes again it liquefy, at pipeline internal circulation flow, reuse.
But brine freezing has following shortcoming:
1. brine freezing needs to set up the circulating system freezing and safeguard refrigeration operation, and this system need build on shield launching end earth's surface or in shield tunnel, and the low temperature that long distance delivery salt solution reaches is not enough to freeze the soil body;
Even if 2. Freezing Station is placed in tunnel internal, the cycle of brine freezing is also longer, has a strong impact on the duration (it is huge that large-scale shield machine shuts down one day economic loss, in the urgent need to saving time);
3. the emergent demand adapting to the large-scale excessive risk shield structure engineerings such as river-crossing tunnel height hydraulic pressure extra long distance is difficult to.
(3) ground is built a station long apart from liquid nitrogen freezing
It is be parked in outside tunnel starting well by liquid nitrogen storage tank and tank car apart from liquid nitrogen freezing system that ground is built a station long, utilizing pipeline liquid nitrogen to be delivered to tunnel freezes in the freezing pipe of work plane, through cyclic absorption geothermal flow, vaporization nitrogen is collected by discharge, recycling stack is drained into spacious place outside tunnel, usually tunnel duct piece is utilized directly to punch or prefabricated pipe section freezes, this kind of method comparatively brine freezing to have freezing system simple, temperature is low, freezing speed is fast, good stability, frozen soil strength advantages of higher, and consolidation by freezing soil body flexible form, the scale of freezing can be determined according to engineering practice.
Ground long distance liquid nitrogen freezing system of building a station is applicable to tunnel and freezes work plane and tunneling well spacing from being no more than relative better, the engineering that tunnel diameter is less of 800m, liquid nitrogen freezing work plane soil layer condition, feed pipe Insulation requires strict, the engineering of high hydraulic pressure, extra long distance, soil layer complicated condition cannot be adapted to, particularly large-scale excessive risk emergency work.
Utility model content
The purpose of this utility model is to provide a kind of high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system.
Build a station compared with long distance liquid nitrogen freezing system with ground, because tunnel diameter is larger, liquid nitrogen storage tank car can directly drive near work plane, liquid nitrogen reaches the temperature freezing work plane lower (-150 DEG C ~-160 DEG C), greatly save freeze-off time, by increasing ground pump pressurization in the liquid nitrogen exit of liquid nitrogen storage tank, the distance of work plane and tunneling well can reach 5.5km.
The purpose of this utility model is achieved through the following technical solutions:
A kind of high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that this system comprises liquid nitrogen storage tank 1, main gate valve 2, feed pipe 3, distributor 4, liquid distribution pipe 5, freezing pipe 6, discharge 7, stack 8, thermometer hole 9 and cold type pipe 10, wherein said liquid nitrogen storage tank 1 is connected with the feed pipe 3 that main gate valve 2 is housed, feed pipe 3 points of two-way are connected with distributor 4 respectively, 8 ~ 10 branch roads established by each distributor 4, each branch road is connected with one group of freezing pipe 6 of connecting by liquid distribution pipe 5, often organize last root freezing pipe 6 to be connected with discharge 7, be connected with stack 8 by discharge 7, nitrogen discharge will be vaporized in air by stack, cold type pipe 10 front end is connected with liquid distribution pipe 5, end is connected with discharge 7.
Described one high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that described liquid nitrogen storage tank 1 is placed on liquid nitrogen tank car, liquid nitrogen storage tank 1 volume is 30m
3,, ensure between normal freezing period that tunnel freezes work plane and has two liquid nitrogen tank cars, the reversing of liquid nitrogen tank car freezes work plane to tunnel, the outlet temperature of liquid nitrogen storage tank 1 controls at-160 DEG C ~-170 DEG C, Stress control is at 0.5MPa ~ 1.6MPa, the liquid nitrogen exit being contained in liquid nitrogen storage tank 1 by carrying vehicle-mounted force (forcing) pump realizes pressurization, when pressure is more than 0.8MPa, the liquid nitrogen exit being contained in liquid nitrogen storage tank 1 by increasing exclusively pump realizes pressurization, pressure is directly proportional to stack 8 length, stack 8 length is 1.5 ~ 5.5km, pressure regulates the main gate valve 2 that can use on liquid nitrogen storage tank 1.
Described one high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that described feed pipe 3 is diameter of inner pipe 108mm wall thickness 4mm, the Stainless Steel Vacuum pipe of outer tube diameter 180mm wall thickness 4mm, inner and outer pipes interlayer 72mm, layer vacuum is less than 5 × 10
-3pa, loss of refrigeration capacity 0.5 ~ 2.0W/m, consider shield machine and supporting thereafter, liquid nitrogen storage tank 1 is 40 ~ 50m to the distance length freezing work plane, if No. 2 feed pipes 3, its front end is connected with 2 liquid nitrogen storage tanks 1 respectively, and its end divides 2 tunnels to connect respectively at each distributor 4.
Described one high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that respectively respectively on described two-way feed pipe 3 filling 1 distributor 4,8 ~ 10 branch roads established by each distributor 4, each branch road are provided with valve 11 and pressure meter 12.
Described one high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that described liquid distribution pipe 5 one end is connected with a branch road on distributor 4, the other end is connected with one group of freezing pipe 6, liquid distribution pipe 5 is diameter 40mm wall thickness 4mm low temperature stainless steel flexible hose, and the additional 1 layer of sealing film of polytene heat-insulation material adopting 2 layers of 1cm thick wraps up.
Described one high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that described freezing pipe 6 is laid along tunnel cross section, freezing pipe 6 mouth of pipe spacing 0.4 ~ 0.9m, spacing at the bottom of pipe is 0.6 ~ 1.1m, every 3 ~ 4 freezing pipes 6 are connected into 1 group, often organize last freezing pipe 6 to be connected with discharge 7, freezing pipe 6 adopts the R304 stainless steel tube of diameter 89mm wall thickness 5mm, freezing pipe 6 inlet temperature controls at-150 DEG C ~-160 DEG C, outlet temperature controls at-120 DEG C ~-130 DEG C, uses the valve 10 on distributor 4 to carry out flow and temperature adjustment.
Described one high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, is characterized in that described discharge 7 is circular layout along tunnel cross-section, adopts the R304 stainless steel tube of diameter 127mm wall thickness 5mm.
Described one high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that described stack 8 is the R304 stainless steel tube of diameter 127mm wall thickness 5mm, its length is 1.5 ~ 5.5km, concrete length freezes the distance of work plane to tunnel exit void spaces depending on tunnel, and the additional 1 layer of sealing film of polytene heat-insulation material that stack 8 front end 100m adopts 2 layers of 1cm thick wraps up.
Described one high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that described thermometer hole 9 is the R304 stainless steel tube of diameter 89mm wall thickness 5mm, thermometer hole 9 quantity N is determined by soil layer quantity n within the scope of tunnel cross-section, N=2*n, in each soil layer, 1 ~ 2 thermometer hole 9 is respectively laid in freezing pipe 6 both sides, shield driving direction thermometer hole 9 is 600mm with the horizontal range of freezing pipe 6, the length of thermometer hole 9 is the distance to shield body 15 inside section of jurisdiction, two points for measuring temperature 14 are laid in each thermometer hole 9, one of them point for measuring temperature 14 is positioned at tunnel duct piece 13 20cm, another point for measuring temperature 14 is arranged in tunnel duct piece 13 with shield shell gap by shield shell place, shield driving in the other direction thermometer hole 9 is 600 ~ 900mm with the horizontal range of freezing pipe 6, thermometer hole 9 length is identical with adjacent freezing pipe 6 length, each laying 6 points for measuring temperature 14 in each thermometer hole 9, in the soil body, point for measuring temperature 14 spacing is 100mm ~ 400mm, and tunnel duct piece 13 and the soil body join each point for measuring temperature 14 in both sides, position.
Described one high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that described cold type pipe 10 front end is connected with liquid distribution pipe 5, end is connected with discharge 7, its diameter is the R304 steel pipe of 32mm wall thickness 4mm, spacing 400mm, divide 2 tunnels to provide liquid nitrogen, lay within the scope of tunnel duct piece 13 inwall freezing pipe 6 both sides 2m, lay 1cm thick polyethylene warming plate above cold type pipe 10 and prevent temperature from rising.
Described one high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that described liquid nitrogen storage tank 1 adopts bolt mode to be connected with the feed pipe 3 that main gate valve 2 is housed, feed pipe 3 adopts welding manner to be connected with distributor 4, on distributor 4, each branch road adopts welding manner to be connected with liquid distribution pipe 5, liquid distribution pipe 5 adopts welding manner to be connected with freezing pipe 6, freezing pipe 6 adopts welding manner to be connected with discharge 7, discharge 7 adopts welding manner to be connected with stack 8, and cold type pipe 10 adopts welding manner to be connected with liquid distribution pipe 5 and discharge 7.
The beneficial effects of the utility model:
A kind of high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, liquid nitrogen tank car can directly reach near tunnel frozen construction work plane, adopt Stainless Steel Vacuum pipe as feed pipe, greatly reduce liquid nitrogen temperature loss, utilize distributor to regulate each group of freezing pipe loop temperature, guarantee that on big cross section, the circulation of each group freezing pipe is normal, homogeneous temperature, it is fast that this system forms frost wall speed, and intensity is high, nontoxic pollution-free, use safety, reliable.
Accompanying drawing explanation
Fig. 1 is high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system schematic, and Fig. 2 a is that shield structure direction of advance thermometer hole point for measuring temperature arranges schematic diagram, and Fig. 2 b is that in shield structure advance opposite direction thermometer hole, point for measuring temperature arranges schematic diagram;
Reference numeral
1---liquid nitrogen storage tank, 2---main gate valve, 3---feed pipe, 4---distributor, 5---liquid distribution pipe, 6---freezing pipe, 7---discharge, 8---stack, 9---thermometer hole, 10---cold type pipe, 11---valve, 12---pressure meter, 13---tunnel duct piece, 14---point for measuring temperature, 15---shield shell, 16---tank car, one, two, three, four, five, N---soil layer level
Detailed description of the invention
Embodiment 1
Nanjing latitude three passes by Jiang Tongdao between Nanjing Yangtze River Bridge and yangtze river in nanjing tunnel, design scheme is X-shaped tunnel, Double-tube double-layer eight track, North gets rotating disk west side, Zhujiang River Zhen Ding mountain, Pukou District, Nanjing, cross over the sand river road in planning, north of the Changjiang River Offshore street, after passing through the Changjiang river, south of the River Offshore street with tunnel form, south pipe tunnel and Ding Huaimen street along connecing, northern pipe tunnel and main road, Yangtze River is suitable connects, total length about 7.2 kilometers;
When on October 18th, 2014, river passage S line shield structure the 780th ring driving passed by by Nanjing latitude three, shield tail duty personnel finds that shield tail has seepage, carries out shutoff immediately, takes the liquid nitrogen freezing system described in manual to freeze; Stratum within the scope of shield tail place shield structure is respectively 4. 1 Extra-fine sand, 4. 3 Extra-fine sand, 5. 2 gravelly sands, 6. 1 cobble from top to bottom, and be 8. 1 intense weathering soft rock below shield structure, top, tunnel hydraulic pressure is 0.5MPa;
Stratum consolidation adopts liquid nitrogen freezing, liquid nitrogen storage tank is arranged in below shield machine No. two stands, liquid nitrogen is transported in the freezing pipe in tunnel duct piece and the soil body by feed pipe and liquid distribution pipe, gasification heat absorption makes ambient water soil temperature degree reduce, nitrogen after gasification by emission by exhaust pipe to outside tunnel, it is 2.0m that freezing curtain designs longitudinal effective thickness, radial effective thickness is 1.4m, design is arranged in gap between tunnel duct piece and shield shell and reaches-2 DEG C by shield housing place measuring point temperature, frost wall average temperature is designed to-15 DEG C, shield body and gummed place, section of jurisdiction freezing curtain average temperature are-8 DEG C,
Freezing pipe is the R304 stainless steel tube of diameter 89mm wall thickness 5mm, totally 61, be divided into 17 groups, pipe range 1.8m is freezed in thin silt, pipe range 1.6m is freezed in gravelly sand stratum, pipe range 1.4m is freezed in pebble layer, pipe range 1m is freezed in sandstone formation, freezing pipe inlet temperature controls at-150 DEG C ~-160 DEG C, freezing pipe outlet temperature controls at-120 DEG C ~-130 DEG C, temperature regulates to use often organizes valve in loop, thermometer hole is the R304 stainless steel tube of diameter 89mm wall thickness 5mm, totally 15, the horizontal range of shield driving direction thermometer hole and freezing pipe is 600mm, the length of thermometer hole is 0.62m, two points for measuring temperature are laid in each thermometer hole, one of them point for measuring temperature is positioned at tunnel duct piece 20cm, another point for measuring temperature is arranged in tunnel duct piece and shield shell place is leaned in shield shell gap, the horizontal range of shield driving opposite direction thermometer hole and freezing pipe is 650mm, thermometer hole length is identical with adjacent freezing pipe length, each laying 6 points for measuring temperature in each thermometer hole, in the soil body, point for measuring temperature spacing is 100mm ~ 400mm, tunnel duct piece and the soil body join each point for measuring temperature in both sides, position, the temperature of liquid nitrogen storage tank outlet controls at-160 DEG C ~-170 DEG C, Stress control is at 0.5MPa, pressure regulates the main gate valve used on liquid nitrogen storage tank, feed pipe is diameter of inner pipe is 108mm wall thickness 4mm, outer tube diameter is the Stainless Steel Vacuum pipe of 180mm wall thickness 4mm, inner and outer pipes interlayer 72mm, layer vacuum is less than 5 × 10
-3pa, loss of refrigeration capacity 0.5 ~ 2.0W/m.Feed pipe divides 2 tunnels to be connected with distributor respectively, each distributor is equipped with 8 branch roads, each branch road is provided with valve and pressure meter, liquid distribution pipe is diameter 40mm wall thickness 4mm low temperature stainless steel flexible hose, and the additional 1 layer of sealing film of polytene heat-insulation material adopting 2 layers of 1cm thick wraps up.Discharge is circular layout along tunnel cross-section, adopt the R304 stainless steel tube of diameter 127mm wall thickness 5mm, stack is the R304 stainless steel tube of diameter 127mm wall thickness 5mm, its length is 1.6km, and the additional 1 layer of sealing film of polytene heat-insulation material that stack 8 front end 100m adopts 2 layers of 1cm thick wraps up.
This engineering liquid nitrogen freezing (the comprising exchanging shield ventral brush) cycle is 21 days, actual frost wall longitudinal thickness 4.62m, radial effective thickness meets design thickness 1.4m, and shield body and gummed place, section of jurisdiction freezing curtain average temperature are-38.6 DEG C, and frozen soil wall average temperature is-56.7 DEG C.
Embodiment 2
The exit of liquid nitrogen storage tank is installed ground pump and is pressurizeed, and feed pipe pressure adopts 1.0MPa, exhaust pipe length 3.5km, and all the other are identical with embodiment 1.
Embodiment 3
The exit of liquid nitrogen storage tank is installed ground pump and is pressurizeed, and feed pipe pressure adopts 1.6MPa, exhaust pipe length 5.5km, and all the other are identical with embodiment 1.
Claims (10)
1. one kind high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that this system comprises liquid nitrogen storage tank (1), main gate valve (2), feed pipe (3), distributor (4), liquid distribution pipe (5), freezing pipe (6), discharge (7), stack (8), thermometer hole (9) and cold type pipe (10), wherein said liquid nitrogen storage tank (1) is connected with the feed pipe (3) that main gate valve (2) are housed, feed pipe (3) point two-way is connected with distributor (4) respectively, 8 ~ 10 branch roads established by each distributor (4), each branch road is connected with one group of freezing pipe (6) of connecting by liquid distribution pipe (5), often organize last root freezing pipe (6) to be connected with discharge (7), be connected with stack (8) by discharge (7), nitrogen discharge will be vaporized in air by stack, cold type pipe (10) front end is connected with liquid distribution pipe (5), end is connected with discharge (7).
2. one according to claim 1 high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that described liquid nitrogen storage tank (1) is placed on liquid nitrogen tank car, liquid nitrogen storage tank (1) volume is 30m
3,, ensure between normal freezing period that tunnel freezes work plane and has two liquid nitrogen tank cars, the reversing of liquid nitrogen tank car freezes work plane to tunnel, the outlet temperature of liquid nitrogen storage tank (1) controls at-160 DEG C ~-170 DEG C, Stress control is at 0.5MPa ~ 1.6MPa, the liquid nitrogen exit being contained in liquid nitrogen storage tank (1) by carrying vehicle-mounted force (forcing) pump realizes pressurization, when pressure is more than 0.8MPa, the liquid nitrogen exit being contained in liquid nitrogen storage tank (1) by increasing exclusively pump realizes pressurization, pressure is directly proportional to stack (8) length, stack (8) length is 1.5 ~ 5.5km, pressure regulates the main gate valve (2) that can use on liquid nitrogen storage tank (1).
3. one according to claim 1 high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that described feed pipe (3) is for diameter of inner pipe 108mm wall thickness 4mm, the Stainless Steel Vacuum pipe of outer tube diameter 180mm wall thickness 4mm, inner and outer pipes interlayer 72mm, layer vacuum is less than 5 × 10
-3pa, loss of refrigeration capacity 0.5 ~ 2.0W/m, consider shield machine and supporting thereafter, liquid nitrogen storage tank (1) is 40 ~ 50m to the distance length freezing work plane, if No. 2 feed pipes (3), its front end is connected with 2 liquid nitrogen storage tanks (1) respectively, and its end divides 2 tunnels to connect respectively at each distributor (4).
4. one according to claim 1 high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that respectively respectively on described two-way feed pipe (3) filling 1 distributor (4), 8 ~ 10 branch roads established by each distributor (4), each branch road are provided with valve (11) and pressure meter (12).
5. one according to claim 1 high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that described liquid distribution pipe (5) one end is connected with a branch road of distributor (4), the other end is connected with one group of freezing pipe (6), liquid distribution pipe (5) is diameter 40mm wall thickness 4mm low temperature stainless steel flexible hose, and the additional 1 layer of sealing film of polytene heat-insulation material adopting 2 layers of 1cm thick wraps up.
6. one according to claim 1 high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that described freezing pipe (6) is laid along tunnel cross section, freezing pipe (6) mouth of pipe spacing 0.4 ~ 0.9m, spacing at the bottom of pipe is 0.6 ~ 1.1m, every 3 ~ 4 freezing pipes (6) are connected into 1 group, often organize last freezing pipe (6) to be connected with discharge (7), freezing pipe (6) adopts the R304 stainless steel tube of diameter 89mm wall thickness 5mm, freezing pipe (6) inlet temperature controls at-150 DEG C ~-160 DEG C, outlet temperature controls at-120 DEG C ~-130 DEG C, the valve (10) on distributor (4) is used to carry out flow and temperature adjustment.
7. one according to claim 1 high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, is characterized in that described discharge (7) is circular layout along tunnel cross-section, adopts the R304 stainless steel tube of diameter 127mm wall thickness 5mm.
8. one according to claim 1 high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that the R304 stainless steel tube that described stack (8) is diameter 127mm wall thickness 5mm, its length is 1.5 ~ 5.5km, concrete length freezes the distance of work plane to tunnel exit void spaces depending on tunnel, and the additional 1 layer of sealing film of polytene heat-insulation material that stack (8) front end 100m adopts 2 layers of 1cm thick wraps up.
9. one according to claim 1 high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that the R304 stainless steel tube that described thermometer hole (9) is diameter 89mm wall thickness 5mm, thermometer hole (9) quantity N is determined by soil layer quantity n within the scope of tunnel cross-section, N=2*n, in each soil layer, 1 ~ 2 thermometer hole (9) is respectively laid in freezing pipe (6) both sides, shield driving direction thermometer hole (9) is 600mm with the horizontal range of freezing pipe (6), the length of thermometer hole (9) is the distance to shield body (15) inside section of jurisdiction, two points for measuring temperature (14) are laid in each thermometer hole (9), one of them point for measuring temperature (14) is positioned at tunnel duct piece (13) 20cm, another point for measuring temperature (14) is arranged in tunnel duct piece (13) with shield shell gap by shield shell place, shield driving in the other direction thermometer hole (9) is 600 ~ 900mm with the horizontal range of freezing pipe (6), thermometer hole (9) length is identical with adjacent freezing pipe (6) length, each laying 6 points for measuring temperature (14) in each thermometer hole (9), in the soil body, point for measuring temperature (14) spacing is 100mm ~ 400mm, and tunnel duct piece (13) and the soil body join each point for measuring temperature (14) in both sides, position.
10. one according to claim 1 high hydraulic pressure extra long distance large cross-section tunnel liquid nitrogen freezing system, it is characterized in that described cold type pipe (10) front end is connected with liquid distribution pipe (5), end is connected with discharge (7), its diameter is the R304 steel pipe of 32mm wall thickness 4mm, spacing 400mm, 2 tunnels are divided to provide liquid nitrogen, lay within the scope of tunnel duct piece (13) inwall freezing pipe (6) both sides 2m, cold type pipe (10) top is laid 1cm thick polyethylene warming plate and is prevented temperature from rising.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104675408A (en) * | 2015-01-27 | 2015-06-03 | 南京林业大学 | Liquid nitrogen freezing system of high water pressure super-long-distance large-sectional tunnel and method of quickly changing shield tail brushes |
| CN105840202A (en) * | 2016-03-29 | 2016-08-10 | 中铁时代建筑设计院有限公司 | Shield tail brush replacement annular freezing reinforcing water seal structure and construction method thereof |
| CN108386214A (en) * | 2018-02-09 | 2018-08-10 | 中交第二航务工程局有限公司 | To the method for shield machine equipment downhole stored heat preservation under extreme low temperature weather |
-
2015
- 2015-01-27 CN CN201520057861.3U patent/CN204627614U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104675408A (en) * | 2015-01-27 | 2015-06-03 | 南京林业大学 | Liquid nitrogen freezing system of high water pressure super-long-distance large-sectional tunnel and method of quickly changing shield tail brushes |
| CN105840202A (en) * | 2016-03-29 | 2016-08-10 | 中铁时代建筑设计院有限公司 | Shield tail brush replacement annular freezing reinforcing water seal structure and construction method thereof |
| CN105840202B (en) * | 2016-03-29 | 2019-09-03 | 中铁时代建筑设计院有限公司 | Annular consolidation by freezing water sealing structure and its construction method when a kind of exchanging shield ventral brush |
| CN108386214A (en) * | 2018-02-09 | 2018-08-10 | 中交第二航务工程局有限公司 | To the method for shield machine equipment downhole stored heat preservation under extreme low temperature weather |
| CN108386214B (en) * | 2018-02-09 | 2019-05-21 | 中交第二航务工程局有限公司 | To the method for shield machine equipment downhole stored heat preservation under extreme low temperature weather |
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Assignee: Jiangsu Rong Rui Construction Technology Co., Ltd. Assignor: Nanjing Forestry University Contract record no.: 2018320000247 Denomination of utility model: High water pressure extra long distance large cross -section tunnel liquid nitrogen freezing system Granted publication date: 20150909 License type: Common License Record date: 20181026 Assignee: CUMT Geotechnical Engineering & New Technology Development Co.,Ltd. Assignor: Nanjing Forestry University Contract record no.: 2018320000246 Denomination of utility model: High water pressure extra long distance large cross -section tunnel liquid nitrogen freezing system Granted publication date: 20150909 License type: Common License Record date: 20181026 Assignee: Jiangsu Construction Engineering Consulting Co., Ltd. Assignor: Nanjing Forestry University Contract record no.: 2018320000245 Denomination of utility model: High water pressure extra long distance large cross -section tunnel liquid nitrogen freezing system Granted publication date: 20150909 License type: Common License Record date: 20181026 |
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