CN105909260A - Subway station water stop structure for protecting groundwater environment and construction method thereof - Google Patents
Subway station water stop structure for protecting groundwater environment and construction method thereof Download PDFInfo
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- CN105909260A CN105909260A CN201610431055.7A CN201610431055A CN105909260A CN 105909260 A CN105909260 A CN 105909260A CN 201610431055 A CN201610431055 A CN 201610431055A CN 105909260 A CN105909260 A CN 105909260A
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- 238000010276 construction Methods 0.000 title claims abstract description 54
- 239000003673 groundwater Substances 0.000 title claims abstract description 28
- 238000007710 freezing Methods 0.000 claims abstract description 145
- 230000008014 freezing Effects 0.000 claims abstract description 144
- 239000002689 soil Substances 0.000 claims abstract description 118
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims description 87
- 239000012267 brine Substances 0.000 claims description 34
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 34
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- 238000009412 basement excavation Methods 0.000 claims description 19
- 238000005057 refrigeration Methods 0.000 claims description 19
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- 238000013461 design Methods 0.000 claims description 17
- 238000005553 drilling Methods 0.000 claims description 15
- 150000003839 salts Chemical class 0.000 claims description 13
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- 239000004033 plastic Substances 0.000 claims description 8
- 229920003023 plastic Polymers 0.000 claims description 8
- 239000006260 foam Substances 0.000 claims description 7
- 229920002223 polystyrene Polymers 0.000 claims description 7
- 239000004793 Polystyrene Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
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- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 5
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- 239000004568 cement Substances 0.000 description 4
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- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 239000001110 calcium chloride Substances 0.000 description 3
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- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 230000009746 freeze damage Effects 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
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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
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Architecture (AREA)
- Soil Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to the electrified railway technology, in particular to a subway station water stop structure for protecting underground water environment and a construction method thereof. This stagnant water structure includes: the device comprises a V-shaped frozen soil water stop layer, wherein two vertical frozen soil walls are arranged in a space enclosed by the V-shaped frozen soil water stop layer; the vertical frozen soil wall is communicated with the V-shaped frozen soil water stop layer. The V-shaped frozen soil waterproof layer prevents external underground water from entering a station foundation pit; the vertical frozen soil wall is used for supporting the stability of soil bodies on two sides of a station foundation pit, protecting the groundwater environment and avoiding polluting the groundwater quality in the construction process. By adopting the freezing water-stopping structure, large-scale drainage construction is avoided, precious underground water resources are saved, and meanwhile, the sedimentation deformation of surrounding adjacent buildings and structures caused by drainage construction is avoided.
Description
Technical field
The present invention relates to electric railway technology, in particular to the subway for protecting groundwater environment
Station water sealing structure and construction method thereof.
Background technology
For the subway construction of region of FuShui, when subway tunnel uses shallow mining method, use sealing or
Subsoil water in the range of drainage sunk well tunnel excavation is the element task before tunnel excavation.At present, China's subway
Tunnel sealing typically uses ejection for water plugging or rotary churning pile water stopping, both sealing modes to be required in soil layer
Injecting cement grout, polluted underground water water quality, cement grout flows to wayward simultaneously, easy blocking underground
The seepage channel of water, changes the percolation path of subsoil water.And use drainaging scheme, the underground valuable by waste
Water resource, level of ground water that draining simultaneously causes reduce easily cause periphery neighbouring to build, the sedimentation and deformation of structures.
Along with urbanization progress and economic development, subway by become solve urban transport problems Main Means it
One.But owing to geological conditions difference is relatively big, surface subsidence, karst during subway construction, often can be caused to collapse
All kinds of the problems of geo-environment such as sunken, wall rock destabilization, also can cause tunnel gushing water, water level decreasing, water pollution
Etc. all kinds of water environmental problems.
For avoiding all kinds of engineering problems caused in Metro Construction or reducing subway engineering to surrounding enviroment
Impact, correlative protection governing measure and method have been carried out substantial amounts of research by Chinese scholars.Albert
Weiler (1983), based on Duisburg of Germany Quaternary Strata condition, sums up subway construction method-sky
Gap concretion method.Sun Yazhe (2003) under Xuanwu Lake traffic tunnel construction may produce water pollute,
The problems of geo-environment such as surface subsidence, surface collapse, tunnel gushing water, for reducing the impact on groundwater environment,
Suggestion limits cutting depth and protection natural sludge layer, uses the fill material of good water permeability, pollutes little building
Build material, chemical grout, use freezing sealing construction scheme to avoid large area artificial rainmaking.(2004) are set a prairie fire in side
For the karst impact on Guangzhou Metro Construction, propose to use freezing method and High-Pressure Grouting Method carry out karst water every
From, solution cavity is used grouting and structure treatment.Xing Wei river bend (2004) analyze Metro Construction may be right
The impact of water quality, it is proposed that use in engineering construction and pollute little construction material and chemical grout, analyze ground
The change of lower water runoff conditions also can make engineering stability variation cause differential settlement, it is proposed that optimizes shield
Each construction parameter, and use corresponding engineering method such as partition, soil stabilization, structure trunk to reinforce and base
Plinth underpins etc. to reduce the impact on surrounding.C.O.Aksoy (2008) analyzes Turkey Yi Zimi
The surface subsidence problem that your subway station engineering dewatering causes, maintains surrounding rock stability by chemical grouting means,
Effectively prevent surface subsidence and make level of ground water recover to previous level.Li Guangtao (2009) is for extensively
Present in No. three line engineering constructions of state subway, molten, soil cave unfavorable geological condition processes, and clearly proposes
The karst treatment measure of shield and open cut.R.Galler (2009) proposes the ground new difficult to understand of a set of economic security
Profit method for tunnel construction (NATM), the method was developed rapidly in recent years in Australia.Fu Zhi
Peak (2010) for the quaternary formation being likely to occur in No. 2 line engineering constructions of Wuhan subway, Karst Geological Landscape,
The geotechnical engineering problems such as subsoil water, it is proposed that engineering dewatering design, diaphram wall, slip casting closure waterproofer
The preventive measures such as journey.Long Yankui (2012) analyzes the karst impact on subway engineering, emphatically to karst cave
The influence factor of cave stability is explored, and proposes digging up and filling in, slip casing by pressure, works leap
Karst cave treatment measures.It is therefore seen that the treatment research focused on some the problems of geo-environment, more
And for should carry out engineering protection process take into account again the research of the spring water water yield and water quality protection the most also than
More rare.
Summary of the invention
It is an object of the invention to provide a kind of for protect groundwater environment subway station water sealing structure and
Its construction method, to solve in tunnel work progress Groundwater Pollution, the problem of protection groundwater resources.
Embodiments provide a kind of subway station water sealing structure for protecting groundwater environment, its bag
Include: the frozen soil sealing layer of V-arrangement, arrange two in the space that the frozen soil sealing layer of described V-arrangement surrounds and stifled vertically freeze
Cob wall；Described vertical frozen soil wall is connected with the frozen soil sealing layer of described V-arrangement；The foundation ditch of described subway station
Heat-insulation layer is laid on ground, both sides, and described heat-insulation layer includes: eps foam plate, polystyrene, extruded sheet, poly-
Any one warming plate in urethane plate.
In certain embodiments, being preferably, the bottom of the frozen soil sealing layer of described V-arrangement is crossed in subway station
Line position；And/or, the thickness of the frozen soil sealing layer of described V-arrangement is 0.5m～2.0m；And/or, described perpendicular
It is 0.5m～3.0m to the thickness of frozen soil wall.
In certain embodiments, it is preferably, the inside of the frozen soil sealing layer of described V-arrangement, described vertical frozen soil
The inside of wall is respectively provided with multiple freezing hole, arranges freezing pipe in described freezing hole.
In certain embodiments, be preferably, a diameter of 50mm～200mm of described freezing hole, described in freeze
Knot pitch of holes 500～1000mm.
In certain embodiments, it is preferably, the frozen soil sealing layer of described V-arrangement and putting down of described vertical frozen soil wall
All temperature not higher than-10 DEG C.
In certain embodiments, it is preferably, the inner surface injection thermal insulation concrete of described foundation ditch.
In certain embodiments, being preferably, described thermal insulation concrete layer includes: air entrained concrete, 0.5%～2%
The latex powder of efficient accelerator, 0.5%～2% and the fiber of 3%～7%.
Present invention also offers the construction party of a kind of subway station water sealing structure for protecting groundwater environment
Method, comprising:
In construction position, subway station, by design orientation and angle excursion, adopt and carry out freezing hole in a like fashion
With creeping into of thermometer hole；Enter freezing pipe under wherein in freezing hole, in described freezing pipe under enter feed pipe；
Refrigeration system is freezed in installation, will freeze refrigeration system and be connected with thermometer hole, feed pipe respectively；
Carry out freeze operation, build the frozen soil sealing layer of V-arrangement, vertical frozen soil wall；
After V-arrangement frozen soil sealing layer and the thickness of vertical frozen soil wall and intensity reach preset requirement, frozen construction
After freezing period is safeguarded in entrance, successively carry out excavation of foundation pit；
Tunnel lining structure is built after excavation of foundation pit.
In certain embodiments, being preferably, creeping into of described freezing hole includes:
Determine freezing pipe, relief tube, the specification of feed pipe, equipment of drilling；
Building drilling machine platform, described drilling machine platform arranges layering and adds a high position；
Freezing hole perforate, the boring mounting hole pipe of each freezing hole；
Fix rig by freezing hole design orientation, put into freezing pipe with creeping into, to after projected depth under freezing pipe
Seal header joints, seals the gap of freezing pipe and orifice tube；Freezing pipe and freezing hole concentricity, freezing hole leak test
Pressure is 0.7～1.0MPa；
Enter feed pipe, feed pipe bottom welding support under in freezing pipe, and outlet and loop Cornu Caprae seu Ovis be installed,
And freezing pipe end cap.
In certain embodiments, be preferably, described in freeze in refrigeration system, outlet saline line, loop salt
Pressure gauge, temperature sensor, control valve it is respectively mounted in water lines；And/or, flow is installed in Brine Pipe outlet
Meter；And/or, two valves of control freezing phase brine flow are installed between brine distributing ring and frigo；And/or,
The eminence of saline line installs vent valve；And/or, refrigerant agent uses calcium chloride solution, and proportion is 1.265.
In certain embodiments, it is preferably, sets gradually polystyrene foam plastics outside described saline line and protect
Temperature layer, plastic sheeting.
In certain embodiments, preferably, freeze refrigeration system described in and also include freezing unit, described freezing
Vaporizer and the cryogenic pipe flex foam of unit are incubated, brine tank and salt water conduit tube polystyrene
Plastic foamboard is incubated.
In certain embodiments, being preferably, described freeze operation includes:
In the case of regulating pressure, temperature at any time, refrigeration system is freezed in operating；
In freezing process, timing detection brine temp, brine flow and frozen soil sealing layer spread scenarios；
Determine that the frozen soil sealing layer of V-arrangement has formed loop connecting structure, and reach preset thickness；
Determine that inside the frozen soil sealing layer of V-arrangement, in non-frozen soil, 2 meters of upper nothings freeze water；
Subregion opens the active well borehole wall；
After being excavated in soil layer, determine that level reaches pre-to thickness, surface temperature and the deformation of frozen soil sealing layer
If requirement；
Freezing period, is safeguarded in entrance；Safeguarding freezing period, if frozen soil sealing layer expansion rate exceedes preset value, freezing
The soil bearing capacity of sealing layer, stability surpass pre-value, then, in the case of brine temp is not higher than-20 DEG C, carry
Haline water temperature.
Subway station water sealing structure and the construction party for protecting groundwater environment that the embodiment of the present invention provides
Method, compared with prior art, the frozen soil sealing layer of V-arrangement, to prevent from externally descending water to enter in station pit；
Vertical frozen soil wall is for supporting stablizing of station pit soil at both sides.
Accompanying drawing explanation
Fig. 1 is for protecting the horizontal stroke of the subway station water sealing structure of groundwater environment in one embodiment of the invention
Generalized section；
Fig. 2 is the schematic diagram freezing refrigeration system in one embodiment of the invention in water sealing structure.
Note: 1 oblique freezing pipe；The frozen soil sealing layer of 2V shape；3 vertical freezing pipes；4 vertical frozen soil walls；5
Ground insulating layer；6 thermal insulation concretes；7 subway stations；8 clarified water pumps；9 freezing units；10 starting cabinets；
11 brine tanks；12 brine pumps；13 freezing pipes；14 cooling towers.
Detailed description of the invention
Combine accompanying drawing below by specific embodiment the present invention is described in further detail.
Being Source of life in view of water, be also the precious resources depended on for existence and development of city, there is half in China
Above city exists and lacks problem, therefore, how to protect the underground of preciousness during metro construction
Water resource is that the key technical problem that engineers and technicians intend to solve, such as Jinan are this well-known with spring water
City, the water quality of protection spring water and the water yield, the matter of utmost importance in subway construction especially.The present invention intends to solve
Technical problem is that in region of FuShui subway tunnel process of construction and how to protect subsoil water, in the case of not precipitation
Realize the most efficiently excavating of subway tunnel.Therefore clearly require solve the technical problem that into:
(1) pollution problem to quality of groundwater during constructing metro tunnel is solved；
(2) solve the protection to subsoil water water resource during constructing metro tunnel, avoid reducing Groundwater
Position, avoids changing seepage action of ground water path, protects spring water.
The subway station water sealing structure for protecting groundwater environment is provided for this, comprising: the freezing of V-arrangement
Soil sealing layer, arranges two in the space that the frozen soil sealing layer of described V-arrangement surrounds and blocks up vertical frozen soil wall；Described perpendicular
Straight frozen soil wall is connected with the frozen soil sealing layer of described V-arrangement；The ground, foundation ditch both sides of described subway station is laid
Heat-insulation layer, described heat-insulation layer includes: appointing in eps foam plate, polystyrene, extruded sheet, polyurethane sheet
A kind of warming plate.
Its construction method includes:
In construction position, subway station, by design orientation and angle excursion, adopt and carry out freezing hole in a like fashion
With creeping into of thermometer hole；Enter freezing pipe under wherein in freezing hole, in described freezing pipe under enter feed pipe；
Refrigeration system is freezed in installation, will freeze refrigeration system and be connected with thermometer hole, feed pipe respectively；
Carry out freeze operation, build the frozen soil sealing layer of V-arrangement, vertical frozen soil wall；
After V-arrangement frozen soil sealing layer and the thickness of vertical frozen soil wall and intensity reach preset requirement, frozen construction
After freezing period is safeguarded in entrance, successively carry out excavation of foundation pit；
Thermal insulation concrete is sprayed in time after excavation of foundation pit.
The frozen soil sealing layer of V-arrangement, to prevent from externally descending water to enter in station pit；Vertical frozen soil wall is used for
Support stablizing of station pit soil at both sides.
It follows that this technology is described in detail:
A kind of for protecting the subway station water sealing structure of groundwater environment, as it is shown in figure 1, comprising: V
The frozen soil sealing layer of shape, arranges two in the space that the frozen soil sealing layer 2 of described V-arrangement surrounds and blocks up vertical frozen soil wall；
Described vertical frozen soil wall is connected with the frozen soil sealing layer 2 of described V-arrangement.The frozen soil sealing layer 2 of V-arrangement interior
Portion, the inside of described vertical frozen soil wall are respectively provided with multiple freezing hole, arrange freezing pipe in described freezing hole.I.e.
Arranging oblique freezing pipe 1 and vertical freezing pipe 3 in both sides, subway station 7, the oblique freezing pipe 1 of both sides is altogether
With the frozen soil sealing layer 2 of one V-arrangement of formation, to prevent from externally descending water to enter in station pit；Vertically freeze
Knot pipe 3, for forming a vertical frozen soil wall, supports stablizing of station pit soil at both sides.
The midline position of subway station 7 is crossed in the bottom of the frozen soil sealing layer 2 of described V-arrangement；Oblique freezing pipe 1
Angle of inclination determine according to construction site, both sides, station and station pit cutting depth, the length of freezing pipe needs
Reach station midline position, be connected with opposite side freezing pipe, form the V-arrangement frozen soil layer closed.
The thickness of the frozen soil sealing layer 2 of described V-arrangement is 0.5m～2.0m.Freezing hole diameter is intended selecting
50mm～200mm, freezing hole spacing 500～1000mm.
The length of vertical freezing pipe 3 determines according to station pit cutting depth, and freezing pipe oblique with homonymy 1
Linking, forms one y shape frozen soil layer, the most waterproof stablizing with soil at both sides.Vertical frozen soil sealing layer
Thickness according to parameter determinations such as the excavation of foundation pit degree of depth, foundation ditch both sides Water And Earth Pressures, ground loads, need to meet
The requirement of soil at both sides stability, its thickness is intended to be 1.0m～3.0m scope.Freezing hole diameter is intended selecting
50mm～200mm, freezing hole spacing 500～1000mm.The thickness of described vertical frozen soil wall 4 is 0.5
M～3.0m.
The mean temperature of effective V layer frozen soil sealing layer and vertical frozen soil wall 4 not higher than-10 DEG C, during excavation
Frozen soil sealing layer surface temperature is less than-3 DEG C.
In order to reduce energy resource consumption, improve the heat insulation effect of refrigeration system, lay insulation on ground, foundation ditch both sides
Layer, sprays thermal insulation concrete 6, collectively forms heat-insulation system on foundation ditch surface in Excavation Process.Ground
Heat-insulation layer 5 can be selected for the heat preservation plate materials such as eps foam plate, polystyrene, extruded sheet, polyurethane sheet.Foundation ditch
Injection thermal insulation concrete 6 bottom both sides and foundation ditch successively sprays with excavation of foundation pit, and jet thickness is intended to be
10～30cm.Thermal insulation concrete 6 is also called air entrained concrete, foam concrete, foamed concrete, belongs to
The category of heat preserving and insulating material, can stop or reduce and extraneous generation heat exchange, reduce having of heat dissipation
The special concrete of certain Physical and mechanical properties.
Thermal insulation concrete 6 uses wet shot method to construct, and in order to reduce the mobility of foam concrete, improves thickness
Degree and adhesive force, the efficient accelerator of BASF, 0.5%～2% of increase by 0.5%～2% in foam concrete
Ternary latex powder and the fiber of 3%～7%.
Provide below the construction method of above-mentioned bored tunnel water sealing structure, specifically include:
Step 101, freezing pipe creeps into preparation；
Part I: freezing pipe, temperature tube, relief tube and feed pipe specification
Freezing pipe can be selected for ф 108 × 8mm low-carbon (LC) seamless steel pipe, and single pipe length is 1.5～2m, uses
Threaded and manual repair welding, temperature tube and the same freezing pipe of hydrology pipe tubing.ф 62 × 6mm is optional for feed pipe
With enhanced polyethylene plastic tube or 15# steel pipe.
Part II: lectotype selection of drilling
Can be selected for 2, MKG-5S type rig.Can be selected for 2, BW-250/50 slush pump, flow is 250
l/min.Rig and slush pump general power are 41kw.
Freezing hole can be used to creep into special combination drilling tool pipe-following drilling.Drillhole inclination survey can use special TY-1
Type high-precision horizontal drilling gyrolevel, boring superficial part theodolite Inclination Measurement by Light is calibrated.
Part III: freezing hole prescription
According to construction reference point, arrange freezing hole by freezing hole construction figure.Position, hole deviation not should be greater than 100mm.
Freezing hole aperture can be selected for 110mm.Freezing hole drilling depth error is-0.2～+0.3m.Hole deviation
Control within 0.8 ‰.
Part IV: drilling machine platform is built
Drilling machine platform uses full hall scaffold pipe to build, and scaffold tube interplanar spacing is 0.6m × 0.6m.Platform
Completely paving 60mm thickness deal board, borer chassis underlay 200mm × 200mm lumps of wood.According to freezing hole position,
Drilling machine platform is increased in layering.
Step 102: by design orientation and angle excursion, adopt and carry out freezing hole and thermometer hole in a like fashion
Creep into；Enter freezing pipe under wherein in freezing hole, in freezing pipe under enter feed pipe；
This step specifically includes:
Step 102-1, freezing hole perforate
Freezing hole can use Φ 160mm diamond core drill perforate.Each boring mounting hole pipe, orifice tube can
Process with ф 159 × 8mm seamless steel pipe.When creeping into, orifice tube mounting hole sealing device.
Step 102-2, freezing hole creeps into be installed with frigo
1. by the freezing hole fixing rig of design orientation requirement.Freezing pipe is put into creeping into.To design under freezing pipe
Seal header joints after the degree of depth.
2. in order to ensure borehole accuracy, it is crucial that perforate section is crept into.When creeping into front 10～20m, school repeatedly
Core drilling rod direction, adjusts rig position, and can continue after theodolite or gyroscope detection deflection no problem
Creep into.
3. under freezing pipe in hand-hole before want first pipe arrangement, it is ensured that freezing pipe concentricity.Under after good freezing pipe, with survey
Tiltedly instrument carries out deviational survey, then the repetition measurement freezing hole degree of depth.Freezing pipe length and qualified rear sealing of deflection freeze tube head
Portion, and carry out suppressing leak test.Freezing hole leak test Stress control, between 0.7～1.0MPa, stablizes 30 points
The unchanged person of clock pressure is qualified for pressure testing.
4., after freezing pipe installs, the gap of freezing pipe and orifice tube is sealed with loss circulation material.
5. feed pipe is entered under in freezing pipe.Feed pipe pipe collar connects, and welding 0.2m is high in feed pipe bottom
Support.Then install go, loop Cornu Caprae seu Ovis and freezing pipe end cap.
Thermometer hole construction method is identical with freezing pipe.
Step 103, install freeze refrigeration system, will freeze refrigeration system respectively with freezing pipe 13, thermometer hole,
Feed pipe is connected；
The installation diagram freezing refrigeration system is referred to accompanying drawing 2.Installation steps specifically include:
Step 103-1, freezes refrigeration plant type selecting and circuit design
1. can be selected for YSKF600 type freezing unit 1 to overlap, each 2 sets (wherein 1 of YSKF300 type freezing unit
Overlap standby).When brine temp is at-30 DEG C, when cooling water temperature is 28 DEG C, the refrigerating capacity of Freezing Station is about
240000kcal/h, freezing unit 9 motor general power is 305kw.
2. can be selected for 8Sh-13 (A) salt water circulating pump 2 (wherein 1 standby), flow 270m3/ h, lift
36m, power of motor 45kw；Select IS200-150-250 cooling water circulating pump 1, flow 400m3/ h,
Lift 20m, motor general power 37kw.
3. can be selected for DBN3-200 type cooling tower 14,2, motor general power 11kw.
4. brine tank 11 is set, one, volume 6m3。
5. salt water conduit tube and collection liquid distribution pipe all select ф 219 × 8mm seamless steel pipe, and salt water conduit tube is a length of
380m.Collection, liquid distribution pipe are connected selection 1.5 " high-pressure rubber pipe with Cornu Caprae seu Ovis.
6. cooling water pipe is with 5, and " thermometeies installed on fridge water inlet pipe and water outlet pipe by welded tube.
7. going, Pressure gauge, temperature sensor and control valve are installed in the saline line of loop.At Brine Pipe
Effusion meter is installed in outlet.
8. two, valve is installed between brine distributing ring and frigo, in order to control freezing device brine flow.
9. the eminence in saline line installs vent valve.
10. saline and pressure respectively 0.7MPa and 0.3MPa of clear water pipeline.
The cooling water amount of the most each Freezing Station is 30m3/ h, maximum total electricity consumption about 398kw.
Other: refrigerator oil select N40 refrigerator oil.R22 cold-producing medium selected by cold-producing medium.Refrigerant agent
Use calcium chloride solution as freeze cycle saline.Saline proportion is 1.265.
Step 103-2, Freezing Station Housing, Furniture, Furnishing And Equipment is installed
Station equipment mainly includes power distribution cabinet (i.e. starting cabinet 10), freezing unit 9, brine tank 11, saline
Pump 12, clarified water pump 8, cooling tower 14 and clear water reserviors etc..Equipment is installed by the requirement of equipment operating manual
Carry out.
At water pump import and export, salt water conduit tube two ends, control valve is installed between collection brine distributing ring and frigo.?
Condenser is imported and exported and is installed point for measuring temperature；Going to salt water conduit tube two ends, loop, temperature and pressure measuring point is installed；Returning
Electromagnetic flowmeter is installed in road salt water conduit tube outlet；Between each frigo and collection brine distributing ring, flow measurement is installed
Loop；At brine tank, liquid level indicating alarm is installed.
In certain embodiments, Freezing Station assembled prefabricated house, clear height 3.5 meters, sound insulation is laid on wall and roof
Plate, clear water reserviors brick masonry, cement plaster, pond is high 0.7 meter.
Step 103-3, pipeline connects, insulation is installed with test instrumentation
Saline and cooling water pipeline are direct the most on the ground with pipe support, Flange joint.Go, loop salt water conduit tube
It is fixed on the active well borehole wall with pipe support.Thermometer, Pressure gauge and effusion meter are installed and are carried out by design.Saline
Pipeline is incubated with polystyrene foam plastics after leak test, cleaning, and insulation layer thickness is 50mm, heat-insulation layer
Outside plastic sheeting wrap up.
The vaporizer of freezing unit and cryogenic pipe with flex foam insulation thick for 50mm, brine tank and
Salt water conduit tube is incubated with polystyrol plastic foam plate thick for 50mm.
Step 103-4, dissolves calcium chloride and unit fills fluorine and refuels
First injecting the clear water of about 1/4 in brine tank, then turn on pump circulates and is gradually added solid calcium chloride,
Until brine strength reaches to design requirement.Impurity to be removed when dissolving calcium chloride.Saline in brine tank can not
Fill the fullest, in order to avoid overflowing brine tank when refluxing higher than the freezing pipe saline of brine tank mouth.
Unit fills fluorine and fridge refuels and carries out according to the requirement of equipment operating manual.First refrigeration system is carried out
The leak detection of system and nitrogen rinse, and after guaranteeing system ne-leakage, then fill fluorine oiling.
Step 104, carries out freeze operation, builds V-arrangement frozen soil sealing layer, vertical frozen soil wall；
This step includes:
Step 104-1, freezing system test running with actively freeze
Equipment carries out debugging and test running after installing.When test running, pressure, temperature to be regulated at any time
Etc. each state parameter, unit is made to run under the conditions of the technical parameter required about technological procedure and design.?
In freezing process, timing detection brine temp, brine flow and frozen soil sealing layer spread scenarios, adjust if desired
Whole freezing system operational factor.Freezing system enters after working well and actively freezes.Require one week inner salt water temperature
Degree is down to less than-20 DEG C.
Step 104-2, examination is dug and is freezed with maintenance
Determine that frozen soil sealing layer has handed over circle according to the observation of hydrology hole, and judge frozen soil sealing according to observed temperature
After layer reaches design thickness, then squeeze into more than 2m, confirmation in non-frozen soil inside frozen soil sealing layer with core drill
Without dynamic water in frozen soil sealing layer.It is then possible to subregion opens the active well borehole wall.After being excavated in soil layer, real
Survey thickness, surface temperature and the deformation of frozen soil sealing layer, as reached to design requirement, then can enter and normally execute
Work, otherwise should stop driving, strengthen freezing, and analyze reason, take corresponding measure.
Enter after excavation of foundation pit and safeguard freezing period.In principle, brine temp and salt are freezed in the maintenance during excavation
Discharge with actively freeze identical, as in construction according to site-test analysis, really prove frozen soil sealing layer extension speed
Spending faster than anticipated, frozen soil sealing layer has enough bearing capacities and stability, meets design requirement, can
To properly increase brine temp, but the highest not above-20 DEG C.After starting to do liner, guaranteeing that outer lining is pacified
In the case of Quan, brine temp can be improved, stop the most in advance freezing.
Step 105, after V-arrangement frozen soil sealing layer and the thickness of vertical frozen soil wall and intensity reach preset requirement,
Frozen construction enters after safeguarding freezing period, successively carries out excavation of foundation pit；
When frozen soil layer effective thickness and intensity reach requirement, frozen construction enters after safeguarding freezing period and successively excavates
Foundation ditch, during excavation, first selects the soil layer that hand excavation does not freezes, recycling pneumatic pick driving frozen soil.Note:
Freezing curtain exposure temperature must not be higher than-5 DEG C, and open-assembly time controls in 24h.
Step 106, builds tunnel lining structure.
This step specifically includes:
Step 106-1, sprays thermal insulation concrete
Spraying one layer of heat preservation concrete after excavation of foundation pit in time, jet thickness is intended to be 10～30cm.Insulation coagulation
Soil uses the construction of wet shot method, in order to reduce the mobility of foam concrete, improves viscosity and adhesive force,
In foam concrete increase by 0.5%～2% the efficient accelerator of BASF, 0.5%～2% ternary latex powder and
The fiber of 3%～7%.
When excavation of foundation pit is to projected depth, at foundation ditch base injcction one layer of heat preservation concrete, thickness is intended to be
10～30cm.
Step 106-2, pours tunnel lining structure
Tunnel-liner should ensure that lining thickness and lapped length of steel bar.Strictly control to measure, prevent tunnel to owe to dig,
During reinforcing bar binding, special messenger is responsible for, and hoop, the longitudinal reinforcement lap of splice are respectively 35～25 times of bar diameter.
For ensureing that strength of lining is not less than the requirement of C30, concrete mix proportion experiment should be made before construction, pass through
Test determines optimum mix, and is strictly controlled by, and makes up to design requirement.
Lining cutting uses the construction of homemade Simple steel formwork jumbo, and during formwork erection, strict Control architecture overall dimensions can not
Invade lining cutting inner outline, and outwards less than 50mm, be responsible for footman's survey crew, and stifled good plug
Plate, to ensure outside form joint not spillage liquid.
For accelerating concrete hardening and preventing local freezing, in concrete, add cement weight 2.5%～4%
J851 early-strength anti-freezing water reducer and the MRT early strength antifreezing agent of cement weight 3%～4%, both materials have
Improve workability and the density of concrete, the anti-permeability performance of Concrete Structure and freexing tolerance, and when construction
Strengthen concrete vibrating, stop voids and pits.
Tunnel-liner should strengthen the seriality of concrete construction, strengthens concrete curing, to prevent frozen soil pair
Concrete has freeze injury.
The invention have the advantages that
(1) protection groundwater environment, it is to avoid polluted underground water water quality during constructing tunnel.
(2) freeze water sealing structure by employing, it is to avoid drainage construction on a large scale, save the ground of preciousness
Lower water resource, avoid simultaneously periphery that drainage construction causes neighbouring build, the sedimentation and deformation of structures.
(3) by arranging thermal insulation concrete between Tunnel Second Lining and frozen soil sealing layer, improve and freeze
The heat-insulating property of soil sealing layer, slow down transmitting with the heat in tunnel of frozen soil sealing layer, is greatly lowered
Freeze expense.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for ability
For the technical staff in territory, the present invention can have various modifications and variations.All in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvement etc. made, should be included in protection scope of the present invention it
In.
Claims (13)
1. the subway station water sealing structure being used for protecting groundwater environment, it is characterised in that including: V
The frozen soil sealing layer of shape, arranges two in the space that the frozen soil sealing layer of described V-arrangement surrounds and blocks up vertical frozen soil wall；
Described vertical frozen soil wall is connected with the frozen soil sealing layer of described V-arrangement；The ground, foundation ditch both sides of described subway station
Heat-insulation layer is laid in face, and described heat-insulation layer includes: eps foam plate, polystyrene, extruded sheet, polyurethane sheet
In any one warming plate.
2. as claimed in claim 1 for protecting the subway station water sealing structure of groundwater environment, it is special
Levying and be, the midline position of subway station is crossed in the bottom of the frozen soil sealing layer of described V-arrangement；And/or, described
The thickness of the frozen soil sealing layer of V-arrangement is 0.5m～2.0m；And/or, the thickness of described vertical frozen soil wall is 0.5
M～3.0m.
3. as claimed in claim 1 for protecting the subway station water sealing structure of groundwater environment, it is special
Levying and be, the inside of the frozen soil sealing layer of described V-arrangement, the inside of described vertical frozen soil wall are respectively provided with multiple freezing
Knot hole, arranges freezing pipe in described freezing hole.
4. as claimed in claim 3 for protecting the subway station water sealing structure of groundwater environment, it is special
Levy and be, a diameter of 50mm～200mm of described freezing hole, described freezing hole spacing 500～1000mm.
5. as claimed in claim 1 for protecting the subway station water sealing structure of groundwater environment, it is special
Levy and be, the frozen soil sealing layer of described V-arrangement and the mean temperature of described vertical frozen soil wall not higher than-10 DEG C.
6. the subway station sealing knot for protecting groundwater environment as described in any one of claim 1-5
Structure, it is characterised in that the inner surface injection thermal insulation concrete of described foundation ditch.
7. as claimed in claim 6 for protecting the subway station water sealing structure of groundwater environment, it is special
Levying and be, described thermal insulation concrete layer includes: the efficient accelerator of air entrained concrete, 0.5%～2%,
The latex powder of 0.5%～2% and the fiber of 3%～7%.
8., for protecting a construction method for the subway station water sealing structure of groundwater environment, its feature exists
In, including:
In construction position, subway station, by design orientation and angle excursion, adopt and carry out freezing hole in a like fashion
With creeping into of thermometer hole；Enter freezing pipe under wherein in freezing hole, in described freezing pipe under enter feed pipe；
Refrigeration system is freezed in installation, will freeze refrigeration system and be connected with thermometer hole, feed pipe respectively；
Carry out freeze operation, build the frozen soil sealing layer of V-arrangement, vertical frozen soil wall；
After V-arrangement frozen soil sealing layer and the thickness of vertical frozen soil wall and intensity reach preset requirement, frozen construction
After freezing period is safeguarded in entrance, successively carry out excavation of foundation pit；
Tunnel lining structure is built after excavation of foundation pit.
9. construction method as claimed in claim 8, it is characterised in that creeping into of described freezing hole includes:
Determine freezing pipe, relief tube, the specification of feed pipe, equipment of drilling；
Building drilling machine platform, described drilling machine platform arranges layering and adds a high position；
Freezing hole perforate, the boring mounting hole pipe of each freezing hole；
Fix rig by freezing hole design orientation, put into freezing pipe with creeping into, to after projected depth under freezing pipe
Seal header joints, seals the gap of freezing pipe and orifice tube；Freezing pipe and freezing hole concentricity, freezing hole leak test
Pressure is 0.7～1.0MPa；
Enter feed pipe, feed pipe bottom welding support under in freezing pipe, and outlet and loop Cornu Caprae seu Ovis be installed,
And freezing pipe end cap.
10. construction method as claimed in claim 8, it is characterised in that described in freeze in refrigeration system,
Pressure gauge, temperature sensor, control valve it is respectively mounted in outlet saline line, loop saline line；With/
Or, effusion meter is installed in Brine Pipe outlet；And/or, control freezing phase saline is installed between brine distributing ring and frigo
Two valves of flow；And/or, the eminence of saline line installs vent valve；And/or, refrigerant agent uses chlorine
Changing calcium solution, proportion is 1.265.
11. construction methods as claimed in claim 10, it is characterised in that outside described saline line successively
Polystyrene foam plastics heat-insulation layer, plastic sheeting are set.
12. construction methods as claimed in claim 10, it is characterised in that described in freeze refrigeration system also
Including freezing unit, the vaporizer of described freezing unit and the insulation of cryogenic pipe flex foam, saline
Case and salt water conduit tube polystyrol plastic foam plate are incubated.
13. construction methods as described in any one of claim 8-12, it is characterised in that described in freeze behaviour
Work includes:
In the case of regulating pressure, temperature at any time, refrigeration system is freezed in operating；
In freezing process, timing detection brine temp, brine flow and frozen soil sealing layer spread scenarios；
Determine that the frozen soil sealing layer of V-arrangement has formed loop connecting structure, and reach preset thickness；
Determine that inside the frozen soil sealing layer of V-arrangement, in non-frozen soil, 2 meters of upper nothings freeze water；
Subregion opens the active well borehole wall；
After being excavated in soil layer, determine that level reaches pre-to thickness, surface temperature and the deformation of frozen soil sealing layer
If requirement；
Freezing period, is safeguarded in entrance；Safeguarding freezing period, if frozen soil sealing layer expansion rate exceedes preset value, freezing
The soil bearing capacity of sealing layer, stability surpass pre-value, then, in the case of brine temp is not higher than-20 DEG C, carry
Haline water temperature.
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| CN106401618A (en) * | 2016-09-30 | 2017-02-15 | 北京城建集团有限责任公司 | Basin-shaped freezing water-stop system for water-enriched sandy gravel stratum deep-buried metro station |
| CN107191207A (en) * | 2017-07-12 | 2017-09-22 | 北京首尔工程技术有限公司 | A kind of station bottom water shutoff construction method and station bottom water shutoff construction |
| CN107729629A (en) * | 2017-09-27 | 2018-02-23 | 上海岩土工程勘察设计研究院有限公司 | A kind of environmental hydrogeology subregion application process for contaminated site |
| CN107905794A (en) * | 2017-09-25 | 2018-04-13 | 上海建工集团股份有限公司 | Method is widened in a kind of subway station for retaining tunnel part section of jurisdiction |
| CN107905795A (en) * | 2017-09-25 | 2018-04-13 | 上海建工集团股份有限公司 | Subway station is inverse under a kind of operation condition widens method |
| CN108217779A (en) * | 2018-02-23 | 2018-06-29 | 中国神华能源股份有限公司 | A kind of groundwater reservoir stage purification system and its distribution method |
| CN108643926A (en) * | 2018-06-20 | 2018-10-12 | 北京城建集团有限责任公司 | A kind of leading pilot tunnel of running tunnel freezes sealing engineering method |
| CN108952727A (en) * | 2018-05-25 | 2018-12-07 | 淮矿西部煤矿投资管理有限公司 | A kind of grouting water blocking method of the vertical creviced formation of high inclination-angle |
| CN109024683A (en) * | 2018-09-04 | 2018-12-18 | 中国电建集团铁路建设有限公司 | A kind of extremely frigid zones subway station insulation construction |
| CN109026055A (en) * | 2018-08-08 | 2018-12-18 | 北京建工土木工程有限公司 | Frost wall building enclosure and its construction method in the construction of portal ring beam |
| CN109162298A (en) * | 2018-10-30 | 2019-01-08 | 桂林理工大学 | A kind of construction method of hydrous fluids pipe gallery |
| 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 |
| CN113294205A (en) * | 2021-03-31 | 2021-08-24 | 济南轨道交通集团有限公司 | Underground water flow guide structure of subway station and construction method |
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| CN106401618A (en) * | 2016-09-30 | 2017-02-15 | 北京城建集团有限责任公司 | Basin-shaped freezing water-stop system for water-enriched sandy gravel stratum deep-buried metro station |
| CN107191207B (en) * | 2017-07-12 | 2018-10-19 | 北京首尔工程技术有限公司 | A kind of station bottom water shutoff construction method and station bottom water shutoff construction |
| CN107191207A (en) * | 2017-07-12 | 2017-09-22 | 北京首尔工程技术有限公司 | A kind of station bottom water shutoff construction method and station bottom water shutoff construction |
| CN107905794A (en) * | 2017-09-25 | 2018-04-13 | 上海建工集团股份有限公司 | Method is widened in a kind of subway station for retaining tunnel part section of jurisdiction |
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| CN107729629B (en) * | 2017-09-27 | 2021-03-12 | 上海勘察设计研究院(集团)有限公司 | Environmental hydrogeological zoning application method for polluted site |
| CN108217779B (en) * | 2018-02-23 | 2020-11-10 | 中国神华能源股份有限公司 | Underground reservoir grading and purifying system and arrangement method thereof |
| CN108217779A (en) * | 2018-02-23 | 2018-06-29 | 中国神华能源股份有限公司 | A kind of groundwater reservoir stage purification system and its distribution method |
| CN108952727A (en) * | 2018-05-25 | 2018-12-07 | 淮矿西部煤矿投资管理有限公司 | A kind of grouting water blocking method of the vertical creviced formation of high inclination-angle |
| CN108952727B (en) * | 2018-05-25 | 2019-09-13 | 淮矿西部煤矿投资管理有限公司 | A kind of grouting water blocking method of the vertical creviced formation of high inclination-angle |
| CN108643926A (en) * | 2018-06-20 | 2018-10-12 | 北京城建集团有限责任公司 | A kind of leading pilot tunnel of running tunnel freezes sealing engineering method |
| CN108643926B (en) * | 2018-06-20 | 2024-03-12 | 北京城建集团有限责任公司 | Freezing water stop construction method for pilot tunnel of section tunnel |
| CN109026055A (en) * | 2018-08-08 | 2018-12-18 | 北京建工土木工程有限公司 | Frost wall building enclosure and its construction method in the construction of portal ring beam |
| CN109026055B (en) * | 2018-08-08 | 2023-12-22 | 北京建工土木工程有限公司 | Freezing wall enclosure structure in portal ring beam construction and construction method thereof |
| CN109024683A (en) * | 2018-09-04 | 2018-12-18 | 中国电建集团铁路建设有限公司 | A kind of extremely frigid zones subway station insulation construction |
| CN109162298A (en) * | 2018-10-30 | 2019-01-08 | 桂林理工大学 | A kind of construction method of hydrous fluids pipe gallery |
| CN109162298B (en) * | 2018-10-30 | 2020-07-31 | 桂林理工大学 | Construction method of comprehensive pipe rack in water-rich area |
| 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 |
| CN113294205A (en) * | 2021-03-31 | 2021-08-24 | 济南轨道交通集团有限公司 | Underground water flow guide structure of subway station and construction method |
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