CN108071400A - Horizontal freezing consolidation combines shield driving construction method with steel jacket box - Google Patents
Horizontal freezing consolidation combines shield driving construction method with steel jacket box Download PDFInfo
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- CN108071400A CN108071400A CN201610988159.8A CN201610988159A CN108071400A CN 108071400 A CN108071400 A CN 108071400A CN 201610988159 A CN201610988159 A CN 201610988159A CN 108071400 A CN108071400 A CN 108071400A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 119
- 239000010959 steel Substances 0.000 title claims abstract description 119
- 238000007710 freezing Methods 0.000 title claims abstract description 108
- 230000008014 freezing Effects 0.000 title claims abstract description 108
- 238000010276 construction Methods 0.000 title claims abstract description 48
- 238000007596 consolidation process Methods 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000000498 cooling water Substances 0.000 claims abstract description 22
- 239000002689 soil Substances 0.000 claims abstract description 22
- 150000003839 salts Chemical class 0.000 claims abstract description 19
- 238000005057 refrigeration Methods 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 4
- 239000012267 brine Substances 0.000 claims description 27
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 27
- 238000013461 design Methods 0.000 claims description 22
- 238000005553 drilling Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 15
- 239000003507 refrigerant Substances 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 13
- 239000003921 oil Substances 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000009412 basement excavation Methods 0.000 claims description 6
- 230000005641 tunneling Effects 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 241000883966 Astrophytum capricorne Species 0.000 claims description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims 1
- 230000017525 heat dissipation Effects 0.000 claims 1
- 230000007115 recruitment Effects 0.000 claims 1
- 239000004576 sand Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 12
- 239000004568 cement Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000033228 biological regulation Effects 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 235000021186 dishes Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 241000233855 Orchidaceae Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012954 risk control Methods 0.000 description 1
- 238000004826 seaming Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Soil Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
Shield driving construction method is combined with steel jacket box the present invention relates to a kind of horizontal freezing consolidation, freezing hole and thermometer hole are arranged at portal；Single portal, which freezes refrigeration equipment, to be included：Freeze unit, salt water circulating pump, cooling water circulating pump and cooling tower；Steel jacket box is including bolted adjustment ring, standard ring and rear end cap, adjustment ring front end are welded to connect with portal steel ring successively；Standard ring lower part is equipped with bearing, and standard ring is divided into two halves up and down, by being bolted；Counter force system is made of reaction frame and bracing members, and the force request of casing, is first laid with low grade mortar in steel jacket box when so that the counter force system is met shield；Soil of filling in barn is added in steel jacket box top-feed mouth from ground using conduit, making stream shape soil, remaining local space adds water to fill up full of steel jacket box, it is ensured that steel jacket box sealing is not leaked.The present invention improves shield-tunneling construction into the success rate and security in hole, and water burst when reducing shield gushes the risk of sand.
Description
Technical field
The present invention relates to a kind of shield driving construction method, horizontal freezing consolidation combines shield construction party with steel jacket box
Method.
Background technology
In China in recent years, City Underground Transportation is just in development like a raging fire." shield method " is undoubtedly carries out city instantly
The preferred construction method of city's underground traffic construction." into hole " is risk control point important in Analysis on Shield Tunnel Driven Process.Into hole
Water burst easily occurs in the process, gushes sand, landslide equivalent risk, therefore needs to take in complicated poor strata shield work progress
Corresponding technical measures, to ensure shield-tunneling construction into the safety in hole.Current existing shield safeguards technique measure is mainly：
Cement system method for strengthening shield construction technology.
Construction technique is reinforced using cement system and carries out shield portal soil stabilization, is had：Applicable stratum is wide, former material
The material extent of supply is wide, consolidation shape can control and intensity is high, durability and concrete castability are good, maneuverability, slurries are concentrated and
It is lost in less.Shortcoming is：When stake it is long more than 15m after pile body verticality be relatively difficult to guarantee, easily cause overlap joint occlusion effect between pile body
Fruit is bad, and the effect of preferable sealing and soil mass consolidation is not achieved；It is poor to reinforce adaptability for sand, powder land floor.
The content of the invention
It is contemplated that the defects of overcoming the prior art, provides a kind of horizontal freezing consolidation and combines shield with steel jacket box
Construction method avoids the reinforcing of cement system and is engaged bad the problem of causing water-stagnating effect bad；Also solves vertical freezing simultaneously
The problem of method for strengthening is influenced by the limitation of ground construction condition and shield buried depth.
In order to solve the above-mentioned technical problem, the present invention is realized in：
A kind of horizontal freezing consolidation combines shield driving construction method with steel jacket box, which is characterized in that it includes：
（One）Shield horizontal freezing Design of Reinforcement and construction；
（1）Consolidation by freezing thickness designs；
P=0.013H；
P is Water And Earth Pressures at the center of hole；H is hole center buried depth；
；
H is consolidation by freezing body thickness；D excavates interior diameter for reinforcing body；B is coefficient 1.2；P is Water And Earth Pressures at the center of hole；K
For safety coefficient 2.0；σ is anti-draw strength；
（2）The arrangement of horizontal frozen hole；
Freezing hole is arranged at portal, the quantity of freezing hole is 40-60, wherein outer ring arrangement 20-50, centre circle arrangement 10-
20, inner ring arrangement 5-10 is arranged in portal center in inner ring there are one freezing hole；
Thermometer hole 6-8 are set, in the uniformly distributed 4-6 thermometer hole in outer ring, between centre circle and inner ring and inner ring and portal
1-2 thermometer hole is respectively laid between center；
（3）Freezing refrigeration design
The coefficient of heat transfer of freezing pipe takes 250kcal/m2H, loss of refrigeration capacity coefficient take 1.3, using Q=π dHKmc, wherein, Q is single
A portal freezes chilling requirement, and d reinforces diameter, H consolidation by freezing thickness for freezing, and K is loss of refrigeration capacity coefficient, and m radiates for freezing pipe
Coefficient, c are temperature difference；
Single portal, which freezes refrigeration equipment, to be included：Freeze unit, salt water circulating pump, cooling water circulating pump and cooling tower；
Using to pipeline include salt water conduit tube, collection liquid distribution pipe, cooling water pipe, horizontal frozen pipe, vertical frozen pipe, temperature tube and
Liquid supply pipe；
Further include brine tank, cooling water tank, refrigerator oil, refrigerant and refrigerant agent；
（4）The design requirement of consolidation by freezing；
A. drilling construction perforate error is not more than 100mm.Drilling maximum deflection value is not greater than 150mm, and all drillings should all
Whole hole deviational survey is carried out, and draws hole scattering figure and each bore position into hole pattern, based thereon determines whether perforations adding and perforations adding position, outside
Collar aperture does not enter shield tunneling face；
B. using No. 20 carbon structural steels, pipeline connection is welded to connect using outer pipe collar, selected for freezing pipe, temperature tube tubing
Outer pipe collar material should be identical with connecting line material；
C. freezing hole drilling depth is not less than design load, no more than design 0.5m, it is impossible to which the tube head length of circulating brine must not be big
In 150mm；
D. injected clear water pressure testing should be carried out after freezing pipe decentralization, test pressure is 1.5-2.0 times of work brine pressure, through pressure testing
30min pressure, which declines, is no more than 0.05MPa, then continues 15min pressure and do not become qualified；
E. soil body number of dropouts during construction freezing hole, which is not greater than, freezes pore volume, and otherwise should carry out grout injection control stratum in time sinks
Drop；
F. positive freeze-off time is designed not less than 35 days.It is required that freezing hole single hole flow is not less than 5m3/h；Actively freeze 7 days salt
Coolant-temperature gage is down to less than -18 DEG C；Brine temp is down to less than -28 DEG C during excavation；It goes, circuit salt water temperature difference is not more than 2 DEG C.Such as salt
Design requirement is not achieved in coolant-temperature gage and brine flow, should extend positive freeze-off time；
When g. actively freezing, dewatering measure must not be taken in the range of 200m near the freezing zone.It must not in soil layer in freezing zone
There is concentrated flow；
H. excavation area freezing hole arrangement circle frost wall with receiving well supporting intersection temperature not higher than -8 DEG C, freeze by other positions
Wall mean temperature is for -10 DEG C and following；
（Two）Shield steel bushing box structure and installation；
Steel jacket box includes bolted adjustment ring, standard ring and rear end cap successively, and adjustment ring front end connects with the welding of portal steel ring
It connects；Standard ring lower part is equipped with bearing, and standard ring is divided into two halves up and down, by being bolted；
Counter force system is made of reaction frame and bracing members, and reaction frame is arranged on rear end behind rear end, and bracing members are supportted in rear end cover back-end
On reaction frame, the force request of casing, is first laid with low grade mortar in steel jacket box when so that the counter force system is met shield；
Installation casing duration degree is adjusted according to the length of shield received well, since shield machine is curve into hole, adjustment ring root
Reserved angle is pre-set out according to the angle of shield, portal steel ring is connected with adjustment ring using freezing, the flange of steel jacket box
End is connected by screw bolts with adjustment ring；
When steel jacket box positions, it is desirable that two steel bushing tank tower center line, central lines of track control lines overlap, and error is not more than 1cm,
Before starting that steel jacket box is installed, central lines of track, that is, the center line of steel jacket box, steel jacket box installation are determined first in foundation pit
After finishing, repetition measurement is carried out to steel jacket box position, after confirming that the center line satisfaction reached with shield machine overlaps requirement, using channel steel
Or I-steel carries out propping to steel jacket box or so and fixes；
Soil of filling in barn is added in steel jacket box top-feed mouth from ground using conduit, makes stream shape soil full of steel jacket box, remaining local sky
Between plus water fill up, it is ensured that steel jacket box sealing does not leak.
The horizontal freezing is consolidated combines shield driving construction method with steel jacket box, it is characterised in that：The freezing hole
Quantity for 59, wherein outer ring arranges 34, and centre circle arranges 16, and inner ring arranges 9, and there are one freezing holes in inner ring to arrange
At portal center；
The horizontal freezing is consolidated combines shield driving construction method with steel jacket box, it is characterised in that：The thermometer hole has 6
It is a, in uniformly distributed 4 thermometer holes in outer ring, 1 survey is respectively laid between centre circle and inner ring and between inner ring and portal center
Wen Kong；
The horizontal freezing is consolidated combines shield driving construction method with steel jacket box, it is characterised in that：The freezing unit choosing
With YSLGF300 types, every group of 23.65 ten thousand kcal/h of standard rating of refrigerating machine, 8.5 ten thousand kcal/h of actual condition refrigerating capacity, power of motor
110kw, salt water circulating pump select IS150-125-400 types, flow 200m3/h, lift 32m, power of motor 30kw；Cooling water follows
Ring pump selects IS150-100-250 types, flow 100m3/h, lift 20m, power of motor 11kw；Cooling tower selects KST-80RT
Type, motor general power 8kw.
The horizontal freezing is consolidated combines shield driving construction method with steel jacket box, it is characterised in that：The brine is done
Pipe sum aggregate liquid distribution pipe selects 159 × 5mm seamless steel pipes, and collection liquid distribution pipe is connected with goat's horn selects 2 " high-pressure rubber pipes；Cooling water pipe
Select 127 × 4.5mm seamless steel pipes；Horizontal frozen pipe uses the low-carbon seamless steel of the 89 × 8mm of φ of 20# (Q235B) steel
Pipe, screwed connection, 1~2m of joint length；Vertical frozen pipe using 20# (Q235B) steel 127 × 4.5mm of φ low-carbon without
Stitch steel pipe；Temperature tube uses the low-carbon seamless steel pipe of 50 × 3mm of φ；Liquid supply pipe selects φ 40PVE pipes.
The horizontal freezing is consolidated combines shield driving construction method with steel jacket box, it is characterised in that：The brine tank
Volume 4.5m3；Cooling water tank volume 8m3, refrigerator oil selection N46 refrigerator oils, refrigerant selection R22 refrigerants, refrigerant agent use
Calcium chloride solution is 1.26 as freeze cycle brine, brine proportion, and it is 15m to freeze refrigeration construction cooling water magnitude of recruitment3/h。
The beneficial effects of the invention are as follows：In order to ensure shield successfully carries out start tunneling under Complicated Geologic Condition, protect
It demonstrate,proves the safety of shield and improves the success rate of shield, therefore horizontal freezing is used to consolidate and combines shield with steel jacket box
Construction method avoids the reinforcing of cement system and is engaged bad the problem of causing water-stagnating effect bad；Also solves vertical freezing simultaneously
The problem of method for strengthening is influenced by the limitation of ground construction condition and shield buried depth improves shield-tunneling construction into the success rate and safety in hole
Property, water burst when reducing shield gushes the risk of sand.
Description of the drawings
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings：
Fig. 1 is the difference schematic diagram of freezing hole and thermometer hole.
Fig. 2 is the structure diagram of steel jacket box.
Specific embodiment
As shown in Figure 1：A kind of horizontal freezing consolidation combines shield driving construction method with steel jacket box, with 7.1m diameters hole
, exemplified by the mono- circle earth pressure balance shield machine start tunnelings of 6.760m.This is reinforced into hole cement system using high-pressure rotary jet grouting pile,
Stake footpath 1000mm, lap of splice 200mm, cement system 6.5 meters of overall length of reinforcing, reinforcing scope is each 3 meters or so up and down of tunnel.
It cuts the earth afterwards since the station underground space uses first to reinforce, then the sequence of construction of constructing structure, therefore the shoveling carried out afterwards and structure
Construction certainly will be to generating certain destruction into hole soil stabilization, and wall and soil mass consolidation seaming position are the most prominent in particular, and
It is 0.5 ~ 0.8MPa that original, which reinforces 28d intensity indexs,.To solve cement system reinforcing body crack-leakage water problems, ensure shield success into
Hole, therefore determine to consolidate using horizontal freezing and combine shield with steel jacket box.
（One）Shield horizontal freezing Design of Reinforcement and construction；
（1）Consolidation by freezing thickness designs；
If frost wall mean temperature T is -10 DEG C, frozen soil compression strength σ pressures=3.6MPa, anti-draw strength σ drawings=2.0MPa, shearing resistance
Intensity τ cuts=1.6MPa.Plate freezing method is taken to reinforce in hole.Consolidation by freezing body plays when shield receives broken wall and resists water
Soil pressure prevents soil layer slump and muddy water from pouring in the effect of active well.
P=0.013H；
P is Water And Earth Pressures at the center of hole；H is hole center buried depth；
；
H is consolidation by freezing body thickness；D excavates interior diameter for reinforcing body；B is coefficient 1.2；P is Water And Earth Pressures at the center of hole；K
For safety coefficient 2.0；σ is anti-draw strength；
（2）The arrangement of horizontal frozen hole；
As shown in Figure 1：Freezing hole laying need to consider construction site and hole buried depth.Freezing hole, the example are arranged at portal
The quantity of freezing hole 6 being set altogether for 59, wherein outer ring 34, W1-W34 represents outer ring freezing hole in figure, race diameter 8.4m,
Into underground layer 2.8m；Centre circle 16, Z1-Z16 represents centre circle freezing hole, middle loop diameter 5.7m, into underground layer 1.8m in figure；Inner ring
9, N1-N9 represents inner ring freezing hole in figure, and inner ring diameter 2.9m, into underground layer 1.8m wherein inner rings, there are one freezing holes in hole
At door center；
Thermometer hole 6 is set, C1-C6 represents thermometer hole in figure, in uniformly distributed 5 thermometer holes in outer ring, centre circle and inner ring it
Between and inner ring and portal center between respectively lay 1 thermometer hole；
（3）Freezing refrigeration design
The coefficient of heat transfer of freezing pipe takes 250kcal/m2H, loss of refrigeration capacity coefficient take 1.3, using Q=π dHKmc, obtain each portal
Freezing chilling requirement is：4.3 ten thousand kcal/h.Wherein, Q freezes chilling requirement for single portal, and d reinforces diameter, H consolidations by freezing for freezing
Thickness, K are loss of refrigeration capacity coefficient, and m is freezing pipe coefficient of heat transfer, and c is temperature difference；
Single portal, which freezes refrigeration equipment, to be included：Freeze unit, salt water circulating pump, cooling water circulating pump and cooling tower；
The freezing unit selects YSLGF300 types, every group of 23.65 ten thousand kcal/h of standard rating of refrigerating machine, actual condition refrigerating capacity 8.5
Ten thousand kcal/h, power of motor 110kw, salt water circulating pump select IS150-125-400 types, flow 200m3/h, lift 32m, motor
Power 30kw；Cooling water circulating pump selects IS150-100-250 types, flow 100m3/h, lift 20m, power of motor 11kw；It is cold
But tower selects KST-80RT types, motor general power 8kw.
Using to pipeline include salt water conduit tube, collection liquid distribution pipe, cooling water pipe, horizontal frozen pipe, vertical frozen pipe, thermometric
Pipe and liquid supply pipe；
The salt water conduit tube sum aggregate liquid distribution pipe selects 159 × 5mm seamless steel pipes, and collection liquid distribution pipe is connected with goat's horn selects 2 " high pressures
Sebific duct；Cooling water pipe selects 127 × 4.5mm seamless steel pipes；Horizontal frozen pipe uses the 89 × 8mm of φ of 20# (Q235B) steel
Low-carbon seamless steel pipe, screwed connection, 1~2m of joint length；Vertical frozen pipe using 20# (Q235B) steel φ 127 ×
The low-carbon seamless steel pipe of 4.5mm；Temperature tube uses the low-carbon seamless steel pipe of 50 × 3mm of φ；Liquid supply pipe selects φ 40PVE pipes.
Further include brine tank, cooling water tank, refrigerator oil, refrigerant and refrigerant agent；
The brine tank volume 4.5m3；Cooling water tank volume 8m3, refrigerator oil selection N46 refrigerator oils, refrigerant selection R22
Refrigerant, for refrigerant agent by the use of calcium chloride solution as freeze cycle brine, brine proportion is 1.26, freezes refrigeration construction cooling water and mends
Charge is 15m3/h。
（4）The design requirement of consolidation by freezing；
A. drilling construction perforate error is not more than 100mm.Drilling maximum deflection value is not greater than 150mm, and all drillings should all
Whole hole deviational survey is carried out, and draws hole scattering figure and each bore position into hole pattern, based thereon determines whether perforations adding and perforations adding position, outside
Collar aperture does not enter shield tunneling face；
B. using No. 20 carbon structural steels, material property should meet for freezing pipe, temperature tube tubing《Carbon constructional quality steel》
（GB/T699-1999、JB/T639-1992）Regulation, tube quality should meet《Seamless steel pipe size, weight》（GB/T17395-
1998）Regulation, and should have qualified quality certificate.Pipeline connection is welded to connect using outer pipe collar, the outer pipe collar of selection
Material should be identical with connecting line material.Welding rod should be complied with relevant regulations using E43 series, quality.
C. freezing hole drilling depth is not less than design load, no more than design 0.5m, it is impossible to which the tube head length of circulating brine is not
150mm must be more than；
D. injected clear water pressure testing should be carried out after freezing pipe decentralization, test pressure is 1.5-2.0 times of work brine pressure, through pressure testing
30min pressure, which declines, is no more than 0.05MPa, then continues 15min pressure and do not become qualified；
E. soil body number of dropouts during construction freezing hole, which is not greater than, freezes pore volume, and otherwise should carry out grout injection control stratum in time sinks
Drop；
F. positive freeze-off time is designed not less than 35 days.It is required that freezing hole single hole flow is not less than 5m3/h；Actively freeze 7 days salt
Coolant-temperature gage is down to less than -18 DEG C；Brine temp is down to less than -28 DEG C during excavation；It goes, circuit salt water temperature difference is not more than 2 DEG C.Such as salt
Design requirement is not achieved in coolant-temperature gage and brine flow, should extend positive freeze-off time；
When g. actively freezing, dewatering measure must not be taken in the range of 200m near the freezing zone.It must not in soil layer in freezing zone
There is concentrated flow；
H. excavation area freezing hole arrangement circle frost wall with receiving well supporting intersection temperature not higher than -8 DEG C, freeze by other positions
Wall mean temperature is for -10 DEG C and following；
Freezing hole construction is crucial, first, wanting the deflection of control freezing hole drilling, two are ensured that the sealing performance of frigo installation
Reach quality requirement.Select the construction of MD-60A types jumbolter.
Basic working procedure for locating holes and pipe of eating dishes without rice or wine install → eat dishes without rice or wine device installation → drilling → measurement → blind hole bottom →
Bulge test → start to freeze.
（Two）Shield steel bushing box structure and installation；
As shown in Figure 2：The long 11.6m of steel jacket box, internal diameter 7.1m, entire casing is made of 6 sections, including adjustment ring 1,1-4 feast-brand marks
Lead ring 2 and rear end cap 3.
Adjustment ring：For the coupling part of casing and hole circle 4, long 1m is divided into 2 pieces, is welded to connect with portal steel ring, and rear
Portion's casing standard collar bolt connection.Upper long 1000mm, lower long 943mm, in 5 ‰ downward trend.
Standard ring：4 sections, single-unit length 2.5m are shared, lower part is equipped with bearing.Two halves up and down can be divided by often saving, by bolt
Connection.Standard paragraphs also are bolted to form entirety each other.
Rear end cap：For closing casing, and the component of counter force system support is born, two halves formula design, with standard paragraphs Section 4
It is bolted, it is 0.6 meter long.
Steel jacket box uses 235 steel plate of thickness 20mm intensity Qs, and each standard ring sets 4 pressure relief vents, each standard ring top
Discharge port at one is set, and vertical, the circumferential gusset of periphery welding of every section of cylinder forms netted to ensure cylinder rigidity, and gusset is thick
20mm, high 150mm are spaced about 550*600mm；The end and upper and lower two sections of circular arc composition surfaces of every section of cylinder are welded to connect method
Orchid, the Q235A steel of flange 24mm thickness, between upper and lower two sections of junctions and two sections of cylinders using M30*150,10.8 grades
It is bolted, centre plus 3mm thickness rubber pads, to ensure sealing effect.
Counter force system 5 is made of reaction frame and bracing members, altogether using 3 root posts, using 9 609 steel bearing diagonals, is supportted respectively
On 9 points of casing rear end cap, according to the driving soil pressure of 0.2MPa during shield, the support force that counter force system can be born
About 700t applies each point by oil pump the prestressing force of 100t, adds up to 900t ＞ 700t, counter force system can be made to meet shield
Into the force request of casing during hole.
Shield is kowtowed after being pushed into steel bushing in order to prevent, and low grade mortar, thickness 10cm, according to reality are first laid in round steel set
Border condition of construction selects M7.5 cement mortar not only to can guarantee the ability of carrying shield machine, but also can guarantee and do not damage cutter head of shield machine.
Be computed shield when stress maximum be 57MPa, casing need to meet above-mentioned requirements, when just can ensure that into hole
Safety.
On the basis of former portal ring flat-plate embedded board, one section of adjustment ring, present case tune are set between steel jacket box and portal ring flat-plate
The long 80cm of the domain, length can be adjusted according to the length of shield received well, since this Project Shield machine is curve into hole, be adjusted
The domain need to pre-set out reserved angle according to the angle of shield.Portal ring flat-plate is connected with adjustment ring using freezing, steel bushing
The flange end of case is connected by screw bolts with adjustment ring.
When steel jacket box positions, it is desirable that two steel bushing tank tower center line, central lines of track control lines overlap, and error is not more than
1cm before starting to install steel jacket box, determines central lines of track, that is, the center line of steel jacket box, steel bushing first in foundation pit
Case carries out repetition measurement after installation is complete, to steel jacket box position, after confirming that the center line satisfaction reached with shield machine is overlapped and required, adopts
Propping is carried out with channel steel or I-steel to steel jacket box or so to fix；
Soil of filling in barn is added in steel jacket box top-feed mouth from ground using conduit, makes stream shape soil full of steel jacket box, remaining local sky
Between plus water fill up, it is ensured that steel jacket box sealing does not leak.
Concrete mode is：March into the arena preparation → drilling construction and refrigeration station installation → actively freezing → shaft bottom yellow ground it is levelling, paving
If steel plate → installation steel jacket box（Adjustment ring, standard paragraphs）→ shield machine is shut down in place → hole door for the first time → pull out cryovial →
Steel spring plate → installation steel jacket box is installed（Back shroud, counter force system）→ door → the filler that holes for the second time → shield recovery driving →
The mud → curved plate seals portal → that shield enters in steel jacket box → shield tail supplement slip casting → emptying steel jacket box dismantles steel jacket box
Upper part → removal shield machine → ending.
Claims (6)
1. a kind of horizontal freezing consolidation combines shield driving construction method with steel jacket box, which is characterized in that it includes：
Shield horizontal freezing Design of Reinforcement and construction；
Consolidation by freezing thickness designs；
P=0.013H；
P is Water And Earth Pressures at the center of hole；H is hole center buried depth；
；
H is consolidation by freezing body thickness；D excavates interior diameter for reinforcing body；B is coefficient 1.2；P is Water And Earth Pressures at the center of hole；K
For safety coefficient 2.0；σ is anti-draw strength；
The arrangement of horizontal frozen hole；
Freezing hole is arranged at portal, the quantity of freezing hole is 40-60, wherein outer ring arrangement 20-50, centre circle arrangement 10-
20, inner ring arrangement 5-10 is arranged in portal center in inner ring there are one freezing hole；
Thermometer hole 6-8 are set, in the uniformly distributed 4-6 thermometer hole in outer ring, between centre circle and inner ring and inner ring and portal
1-2 thermometer hole is respectively laid between center；
Freezing refrigeration design
The coefficient of heat transfer of freezing pipe takes 250kcal/m2H, loss of refrigeration capacity coefficient take 1.3, using Q=π dHKmc, wherein, Q is single
Portal freezes chilling requirement, and d reinforces diameter, H consolidation by freezing thickness for freezing, and K is loss of refrigeration capacity coefficient, and m is freezing pipe heat dissipation system
Number, c is temperature difference；
Single portal, which freezes refrigeration equipment, to be included：Freeze unit, salt water circulating pump, cooling water circulating pump and cooling tower；
Using to pipeline include salt water conduit tube, collection liquid distribution pipe, cooling water pipe, horizontal frozen pipe, vertical frozen pipe, temperature tube and
Liquid supply pipe；
Further include brine tank, cooling water tank, refrigerator oil, refrigerant and refrigerant agent；
（4）The design requirement of consolidation by freezing；
A. drilling construction perforate error is not more than 100mm；
Drilling maximum deflection value is not greater than 150mm, and all drillings should all carry out whole hole deviational survey, and draw hole scattering figure and
Each bore position based thereon determines whether perforations adding and perforations adding position, cycle hole does not enter shield tunneling face into hole pattern；
B. using No. 20 carbon structural steels, pipeline connection is welded to connect using outer pipe collar, selected for freezing pipe, temperature tube tubing
Outer pipe collar material should be identical with connecting line material；
C. freezing hole drilling depth is not less than design load, no more than design 0.5m, it is impossible to which the tube head length of circulating brine must not be big
In 150mm；
D. injected clear water pressure testing should be carried out after freezing pipe decentralization, test pressure is 1.5-2.0 times of work brine pressure, through pressure testing
30min pressure, which declines, is no more than 0.05MPa, then continues 15min pressure and do not become qualified；
E. soil body number of dropouts during construction freezing hole, which is not greater than, freezes pore volume, and otherwise should carry out grout injection control stratum in time sinks
Drop；
F. positive freeze-off time is designed not less than 35 days；
It is required that freezing hole single hole flow is not less than 5m3/h；Actively freezing 7 days brine temps is down to less than -18 DEG C；Brine during excavation
Temperature is down to less than -28 DEG C；It goes, circuit salt water temperature difference is not more than 2 DEG C；
If design requirement is not achieved in brine temp and brine flow, positive freeze-off time should be extended；
When g. actively freezing, dewatering measure must not be taken in the range of 200m near the freezing zone；
There must not be concentrated flow in soil layer in freezing zone；
H. excavation area freezing hole arrangement circle frost wall with receiving well supporting intersection temperature not higher than -8 DEG C, freeze by other positions
Wall mean temperature is for -10 DEG C and following；
（Two）Shield steel bushing box structure and installation；
Steel jacket box includes bolted adjustment ring, standard ring and rear end cap successively, and adjustment ring front end connects with the welding of portal steel ring
It connects；Standard ring lower part is equipped with bearing, and standard ring is divided into two halves up and down, by being bolted；
Counter force system is made of reaction frame and bracing members, and reaction frame is arranged on rear end behind rear end, and bracing members are supportted in rear end cover back-end
On reaction frame, the force request of casing, is first laid with low grade mortar in steel jacket box when so that the counter force system is met shield；
Installation casing duration degree is adjusted according to the length of shield received well, since shield machine is curve into hole, adjustment ring root
Reserved angle is pre-set out according to the angle of shield, portal steel ring is connected with adjustment ring using freezing, the flange of steel jacket box
End is connected by screw bolts with adjustment ring；
When steel jacket box positions, it is desirable that two steel bushing tank tower center line, central lines of track control lines overlap, and error is not more than 1cm,
Before starting that steel jacket box is installed, central lines of track, that is, the center line of steel jacket box, steel jacket box installation are determined first in foundation pit
After finishing, repetition measurement is carried out to steel jacket box position, after confirming that the center line satisfaction reached with shield machine overlaps requirement, using channel steel
Or I-steel carries out propping to steel jacket box or so and fixes；
Soil of filling in barn is added in steel jacket box top-feed mouth from ground using conduit, makes stream shape soil full of steel jacket box, remaining local sky
Between plus water fill up, it is ensured that steel jacket box sealing does not leak.
2. horizontal freezing consolidation according to claim 1 combines shield driving construction method with steel jacket box, it is characterised in that：
The quantity of the freezing hole be 59, wherein outer ring arrange 34, centre circle arrange 16, inner ring arrange 9, in inner ring there are one
Freezing hole is arranged in portal center.
3. horizontal freezing consolidation according to claim 2 combines shield driving construction method with steel jacket box, it is characterised in that：
The thermometer hole has 6, in uniformly distributed 4 thermometer holes in outer ring, between centre circle and inner ring and inner ring and portal center it
Between respectively lay 1 thermometer hole.
4. horizontal freezing consolidation according to claim 3 combines shield driving construction method with steel jacket box, it is characterised in that：
The freezing unit selects YSLGF300 types, every group of 23.65 ten thousand kcal/h of standard rating of refrigerating machine, actual condition refrigerating capacity 8.5 ten thousand
Kcal/h, power of motor 110kw, salt water circulating pump select IS150-125-400 types, flow 200m3/h, lift 32m, motor work(
Rate 30kw；Cooling water circulating pump selects IS150-100-250 types, flow 100m3/h, lift 20m, power of motor 11kw；Cooling
Tower selects KST-80RT types, motor general power 8kw.
5. horizontal freezing consolidation according to claim 4 combines shield driving construction method with steel jacket box, it is characterised in that：
The salt water conduit tube sum aggregate liquid distribution pipe selects 159 × 5mm seamless steel pipes, and collection liquid distribution pipe is connected with goat's horn selects 2 " high-pressure glues
Pipe；Cooling water pipe selects 127 × 4.5mm seamless steel pipes；Horizontal frozen pipe is using the 89 × 8mm's of φ of 20# (Q235B) steel
Low-carbon seamless steel pipe, screwed connection, 1~2m of joint length；Vertical frozen pipe using 20# (Q235B) steel φ 127 ×
The low-carbon seamless steel pipe of 4.5mm；Temperature tube uses the low-carbon seamless steel pipe of 50 × 3mm of φ；Liquid supply pipe selects φ 40PVE pipes.
6. horizontal freezing consolidation according to claim 5 combines shield driving construction method with steel jacket box, it is characterised in that：
The brine tank volume 4.5m3；Cooling water tank volume 8m3, refrigerator oil selection N46 refrigerator oils, refrigerant selection R22 refrigeration
Agent, for refrigerant agent by the use of calcium chloride solution as freeze cycle brine, brine proportion is 1.26, freezes refrigeration construction cooling water magnitude of recruitment
For 15m3/h。
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108915710A (en) * | 2018-06-28 | 2018-11-30 | 广东华隧建设集团股份有限公司 | A kind of shield machine opens a position acceptance method |
| CN109184728A (en) * | 2018-10-30 | 2019-01-11 | 浙江科技学院 | The vertical combined type multidimensional of flank-for soft or hard stratum freezes drilling method |
| CN109268025A (en) * | 2018-10-30 | 2019-01-25 | 浙江科技学院 | The vertical combined type multidimensional of flank-for soft or hard stratum freezes cutting arrangement |
| CN109403987A (en) * | 2018-12-11 | 2019-03-01 | 南京林业大学 | Shield end horizontal frozen combines reception device and construction method with short steel case |
| CN109505295A (en) * | 2018-11-19 | 2019-03-22 | 上海市基础工程集团有限公司 | Diaphram wall joint seal freezes construction technology |
| CN110030007A (en) * | 2019-05-06 | 2019-07-19 | 济南城建集团有限公司 | Shield horizontal freezing receives construction method |
| CN111173517A (en) * | 2020-01-03 | 2020-05-19 | 安徽理工大学 | Local heat preservation freezing method for coal mine deep vertical shaft freezing method construction |
| CN113338950A (en) * | 2021-06-28 | 2021-09-03 | 中铁(上海)投资集团有限公司 | Shield closed arrival construction method of freezing method and cement system combined steel sleeve |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08219617A (en) * | 1995-02-09 | 1996-08-30 | Mayekawa Mfg Co Ltd | Tunnel freezer for food refrigeration |
| CN101644161A (en) * | 2009-07-24 | 2010-02-10 | 上海建工（集团）总公司 | Water stopping device for tunneling machine going in and out of tunnel and water stopping method |
| CN201460904U (en) * | 2009-06-29 | 2010-05-12 | 上海市基础工程公司 | Ultra-long horizontal freezing consolidation structure for shield entry |
| CN101749485A (en) * | 2008-12-18 | 2010-06-23 | 上海市机械施工有限公司 | Pipeline laying construction method combining non-excavation jacking and liquid nitrogen horizontal freezing excavation laying |
| CN102797468A (en) * | 2012-08-22 | 2012-11-28 | 中铁第四勘察设计院集团有限公司 | Minimum over-burden originating method for shield tunnel |
| CN103527214A (en) * | 2013-11-04 | 2014-01-22 | 南京林业大学 | Horizontal freezing and pipe shed combined subway shield tunnel reinforcing tip and method |
| CN104675405A (en) * | 2014-12-31 | 2015-06-03 | 上海市机械施工集团有限公司 | Rectangular pipe jacking machine tunnel entering auxiliary structure and construction method |
| CN104790961A (en) * | 2015-04-27 | 2015-07-22 | 海南大学 | Vertical cup type freezing reinforcement structure and method at shield tunnel end |
| CN204609889U (en) * | 2015-04-27 | 2015-09-02 | 海南大学 | A kind of shield tunnel termination vertical cup type consolidation by freezing structure |
-
2016
- 2016-11-10 CN CN201610988159.8A patent/CN108071400A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08219617A (en) * | 1995-02-09 | 1996-08-30 | Mayekawa Mfg Co Ltd | Tunnel freezer for food refrigeration |
| CN101749485A (en) * | 2008-12-18 | 2010-06-23 | 上海市机械施工有限公司 | Pipeline laying construction method combining non-excavation jacking and liquid nitrogen horizontal freezing excavation laying |
| CN201460904U (en) * | 2009-06-29 | 2010-05-12 | 上海市基础工程公司 | Ultra-long horizontal freezing consolidation structure for shield entry |
| CN101644161A (en) * | 2009-07-24 | 2010-02-10 | 上海建工（集团）总公司 | Water stopping device for tunneling machine going in and out of tunnel and water stopping method |
| CN102797468A (en) * | 2012-08-22 | 2012-11-28 | 中铁第四勘察设计院集团有限公司 | Minimum over-burden originating method for shield tunnel |
| CN103527214A (en) * | 2013-11-04 | 2014-01-22 | 南京林业大学 | Horizontal freezing and pipe shed combined subway shield tunnel reinforcing tip and method |
| CN104675405A (en) * | 2014-12-31 | 2015-06-03 | 上海市机械施工集团有限公司 | Rectangular pipe jacking machine tunnel entering auxiliary structure and construction method |
| CN104790961A (en) * | 2015-04-27 | 2015-07-22 | 海南大学 | Vertical cup type freezing reinforcement structure and method at shield tunnel end |
| CN204609889U (en) * | 2015-04-27 | 2015-09-02 | 海南大学 | A kind of shield tunnel termination vertical cup type consolidation by freezing structure |
Non-Patent Citations (2)
| Title |
|---|
| 380931729: "《盾构始发和接收冻结法地基加固工程》", 23 October 2015, 百度文库 * |
| 姚伟峰: "水平冻结与钢套箱辅助盾构进洞施工技术研究", 《建筑施工》 * |
Cited By (11)
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| CN108915710A (en) * | 2018-06-28 | 2018-11-30 | 广东华隧建设集团股份有限公司 | A kind of shield machine opens a position acceptance method |
| CN109184728A (en) * | 2018-10-30 | 2019-01-11 | 浙江科技学院 | The vertical combined type multidimensional of flank-for soft or hard stratum freezes drilling method |
| CN109268025A (en) * | 2018-10-30 | 2019-01-25 | 浙江科技学院 | The vertical combined type multidimensional of flank-for soft or hard stratum freezes cutting arrangement |
| CN109184728B (en) * | 2018-10-30 | 2020-07-24 | 浙江科技学院 | Side wing-vertical combined type multi-dimensional freezing drilling and cutting method for soft and hard stratum |
| CN109505295A (en) * | 2018-11-19 | 2019-03-22 | 上海市基础工程集团有限公司 | Diaphram wall joint seal freezes construction technology |
| CN109403987A (en) * | 2018-12-11 | 2019-03-01 | 南京林业大学 | Shield end horizontal frozen combines reception device and construction method with short steel case |
| CN109403987B (en) * | 2018-12-11 | 2023-10-20 | 南京林业大学 | Shield end horizontal freezing and short steel box combined receiving device and construction method |
| CN110030007A (en) * | 2019-05-06 | 2019-07-19 | 济南城建集团有限公司 | Shield horizontal freezing receives construction method |
| CN111173517A (en) * | 2020-01-03 | 2020-05-19 | 安徽理工大学 | Local heat preservation freezing method for coal mine deep vertical shaft freezing method construction |
| CN111173517B (en) * | 2020-01-03 | 2021-08-20 | 安徽理工大学 | Local heat preservation freezing method for coal mine deep vertical shaft freezing method construction |
| CN113338950A (en) * | 2021-06-28 | 2021-09-03 | 中铁(上海)投资集团有限公司 | Shield closed arrival construction method of freezing method and cement system combined steel sleeve |
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