CN205804382U - For protecting the open trench tunnel water sealing structure of groundwater environment - Google Patents
For protecting the open trench tunnel water sealing structure of groundwater environment Download PDFInfo
- Publication number
- CN205804382U CN205804382U CN201620586909.4U CN201620586909U CN205804382U CN 205804382 U CN205804382 U CN 205804382U CN 201620586909 U CN201620586909 U CN 201620586909U CN 205804382 U CN205804382 U CN 205804382U
- Authority
- CN
- China
- Prior art keywords
- frozen soil
- sealing layer
- soil sealing
- tunnel
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
This utility model relates to underground engineering technology, is particularly used for protecting the open trench tunnel water sealing structure of groundwater environment.This open trench tunnel water sealing structure includes: be arranged at the vertical frozen soil sealing layer of tunnel open excavation foundation ditch both sides, and the level bottom described tunnel open excavation foundation ditch that is arranged at is to frozen soil sealing layer, described vertical frozen soil sealing layer and described level intersect to frozen soil sealing layer, and the bottom of described vertical frozen soil sealing layer is less than described level to the bottom of frozen soil sealing layer.This utility model uses vertical frozen soil sealing layer, level to the frozen soil sealing layer of frozen soil sealing layer building U-lag, protects groundwater environment, it is to avoid polluted underground water water quality during constructing tunnel.Freeze water sealing structure by employing, it is to avoid drainage construction on a large scale, saved the groundwater resources of preciousness, avoid simultaneously periphery that drainage construction causes neighbouring build, the sedimentation and deformation of structures.
Description
Technical field
This utility model relates to underground engineering technology, in particular to the open trench tunnel for protecting groundwater environment
Water sealing structure.
Background technology
For the subway construction of region of FuShui, when subway tunnel uses cut and cover tunneling, use sealing or drainage position
Subsoil water in the range of reason 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 are required in soil layer injecting cement grout, polluted underground water water
Matter, cement grout flows to wayward simultaneously, the seepage channel of easy blocking underground water, changes the percolation path of subsoil water.And
Using drainaging scheme, the groundwater resources valuable by waste, the level of ground water reduction that draining simultaneously causes easily causes periphery neighbouring
Build, the sedimentation and deformation of structures.
Along with urbanization progress and economic development, subway will become one of Main Means of solution urban transport problems.But
It is owing to geological conditions difference is relatively big, surface subsidence, karst collapse, wall rock destabilization etc. during subway construction, often can be caused all kinds of
The problems of geo-environment, also can cause all kinds of water environmental problems such as tunnel gushing water, water level decreasing, water pollution.
For avoiding all kinds of engineering problems caused in Metro Construction or reducing the subway engineering impact on surrounding enviroment,
Correlative protection governing measure and method have been carried out substantial amounts of research by Chinese scholars.Albert Weiler (1983) is based on moral
Will Duisburg Quaternary Strata condition, sums up subway construction method-space concretion method.Sun Yazhe (2003) is for Nanjing
Under the XuanWu Lake, traffic tunnel construction may produce the problems of geo-environment such as water pollution, surface subsidence, surface collapse, tunnel gushing water,
For reducing the impact on groundwater environment, it is proposed that limit cutting depth and protection natural sludge layer, use banketing of good water permeability
Material, pollute little construction material, chemical grout, use freezing sealing construction scheme to avoid large area artificial rainmaking.Set a prairie fire in side
(2004) for the karst impact on Guangzhou Metro Construction, propose to use freezing method and High-Pressure Grouting Method to carry out karst water isolation,
Solution cavity is used grouting and structure treatment.Xing Wei river bend (2004) analyze Metro Construction may be on the impact of water quality, it is proposed that
Using in engineering construction and pollute little construction material and chemical grout, the change analyzing groundwater flow condition also can make
Engineering stability be deteriorated cause differential settlement, it is proposed that optimize each construction parameter of shield, and use corresponding engineering method as every
Disconnected, soil stabilization, structure trunk are reinforced and foundation underpinning etc. is to reduce the impact on surrounding.C.O.Aksoy(2008)
Analyze the surface subsidence problem that Turkey's Izmir subway station engineering dewatering causes, maintain country rock by chemical grouting means
Stability, effectively prevents surface subsidence and makes level of ground water recover to previous level.Li Guangtao (2009) is for ground, Guangzhou
Present in No. three line engineering constructions of ferrum, molten, soil cave unfavorable geological condition processes, and clearly proposes the rock of shield and open cut
Molten treatment measures.R.Galler (2009) proposes new Austria's method for tunnel construction (NATM) of a set of economic security, the party
Method was developed rapidly in recent years in Australia.Fu Zhifeng (2010) is for possible in No. 2 line engineering constructions of Wuhan subway
The quaternary formation that occurs, Karst Geological Landscape, the geotechnical engineering problems such as subsoil water, it is proposed that engineering dewatering design, diaphram wall,
The preventive measures such as slip casting closure waterproofing work.Long Yankui (2012) analyzes the karst impact on subway engineering, emphatically to karst
The influence factor of cave stability is explored, and proposes digging up and filling in, slip casing by pressure, the karst cave of works leap
Treatment measures.It is therefore seen that the treatment research focused on some the problems of geo-environment, and prevent for engineering should be carried out more
Protect and process that to take into account the research of the spring water water yield and water quality protection again the most rare.
Utility model content
The purpose of this utility model is to provide a kind of open trench tunnel water sealing structure for protecting groundwater environment, to solve
To Groundwater Pollution during constructing tunnel, the problem of protection groundwater resources.
This utility model embodiment provides a kind of for protecting the open trench tunnel water sealing structure of groundwater environment, comprising:
It is arranged at the vertical frozen soil sealing layer of tunnel open excavation foundation ditch both sides, and the level bottom described tunnel open excavation foundation ditch that is arranged at is to freezing
Soil sealing layer, described vertical frozen soil sealing layer and described level intersect to frozen soil sealing layer, the end of described vertical frozen soil sealing layer
Portion is less than described level to the bottom of frozen soil sealing layer.
In certain embodiments, being preferably, heat-insulation layer is laid on ground, described tunnel open excavation foundation ditch both sides；Described heat-insulation layer bag
Include: eps foam plate, polystyrene, extruded sheet or polyurethane sheet.
In certain embodiments, being preferably, the medial surface of described vertical frozen soil sealing layer and described level are to frozen soil sealing
The medial surface of layer is injected with thermal insulation concrete.
In certain embodiments, being preferably, described thermal insulation concrete includes: air entrained concrete, 0.5%～2% efficient
The latex powder of accelerator, 0.5%～2% and the fiber of 3%～7%.
In certain embodiments, being preferably, the thickness of described vertical frozen soil sealing layer is 1～3 meter；And/or, described level
Thickness to frozen soil sealing layer is 1～3 meter；And/or, the distance between adjacent two described tunnel open excavation foundation ditches is 20～80
Rice；And/or, described level is to the mean temperature of frozen soil sealing layer and described vertical frozen soil sealing layer not higher than-10 DEG C.
In certain embodiments, being preferably, described vertical frozen soil sealing layer includes vertical freezing hole, described vertical freezing hole
A diameter of 50～200 millimeters, described level spacing between freezing hole is 500～1000 millimeters.
In certain embodiments, being preferably, described level includes level to freezing hole to frozen soil sealing layer, described level to
A diameter of 50～200 millimeters of freezing hole, described level spacing between freezing hole is 500～1000 millimeters；Described level
Clear spacing to freezing hole Yu tunnel floor panel structure outline is 200～800 millimeters.
The open trench tunnel water sealing structure for protecting groundwater environment that this utility model embodiment provides, with prior art
Compare, use vertical frozen soil sealing layer, level to the frozen soil sealing layer of frozen soil sealing layer building U-shaped, prevent outside open-cut foundation ditch
Subsoil water enter U-lag, protect groundwater environment, it is to avoid polluted underground water water quality during constructing tunnel simultaneously..By adopting
With freezing water sealing structure, it is to avoid drainage construction on a large scale, save the groundwater resources of preciousness, avoided drainage construction simultaneously
The periphery caused is neighbouring to be built, the sedimentation and deformation of structures.
By arranging thermal insulation concrete between tunnel-liner and frozen soil sealing layer, improve the heat insulating ability of frozen soil sealing layer
Can, slow down frozen soil sealing layer and the transmission of the heat in tunnel, considerably reduce and freeze expense.
Accompanying drawing explanation
Fig. 1 is for protecting the cross-sectional of the open trench tunnel water sealing structure of groundwater environment in one embodiment of this utility model
Schematic diagram；
Fig. 2 is the schematic diagram freezing refrigeration system in one embodiment of this utility model in open trench tunnel water sealing structure.
Note: 1 level is to frozen soil sealing layer；2 vertical frozen soil sealing layers；3 vertical freezing pipes；4 levels are to freezing pipe；5 insulations
Concrete；6 ground insulating layers；7 tunnel structures；8 clarified water pumps；9 freezing units；10 starting cabinets；11 brine tanks；12 brine pumps；13
Freezing pipe；14 cooling towers.
Detailed description of the invention
Combine accompanying drawing below by specific embodiment this utility model 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, China has more than half
City exists and lacks problem, and therefore, the groundwater resources how protecting preciousness during metro construction are engineerings
This city well-known with spring water of the key technical problem that personnel intend to solve, such as Jinan, the water quality of protection spring water and the water yield,
Matter of utmost importance in subway construction especially.What this utility model intended to solve technical problem is that region of FuShui subway tunnel process of construction
In 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 for:
(1) pollution problem to quality of groundwater during constructing metro tunnel is solved；
(2) protection to subsoil water water resource during constructing metro tunnel is solved, it is to avoid reduce groundwater level, it is to avoid
Change seepage action of ground water path, protect spring water.
The open trench tunnel water sealing structure for protecting groundwater environment is provided, comprising: be arranged at tunnel open excavation for this
The vertical frozen soil sealing layer of foundation ditch both sides, and the level bottom described tunnel open excavation foundation ditch that is arranged at is to frozen soil sealing layer, described
Vertical frozen soil sealing layer and described level intersect to frozen soil sealing layer, and the bottom of described vertical frozen soil sealing layer is less than described level
Bottom to frozen soil sealing layer.
Use vertical frozen soil sealing layer, level to the frozen soil sealing layer of frozen soil sealing layer building U-shaped, prevent outside open-cut foundation ditch
The subsoil water in portion enters U-lag, protects groundwater environment, it is to avoid polluted underground water water quality during constructing tunnel simultaneously.Pass through
Water sealing structure is freezed in employing, it is to avoid drainage construction on a large scale, has saved the groundwater resources of preciousness, has avoided draining simultaneously and execute
The periphery that work causes is neighbouring to be built, the sedimentation and deformation of structures.
It follows that this technology is described in detail:
A kind of for protecting the open trench tunnel water sealing structure of groundwater environment, as it is shown in figure 1, include: be arranged at tunnel bright
Dig the vertical frozen soil sealing layer 2 of foundation ditch (inside setting tunnel structure 7) both sides, and be arranged at the level bottom described tunnel open excavation foundation ditch
To frozen soil sealing layer 1, described vertical frozen soil sealing layer 2 and described level intersect to frozen soil sealing layer 1, constitute U-lag structure, institute
The bottom stating vertical frozen soil sealing layer 2 is less than described level to the bottom of frozen soil sealing layer 1.Arrange in tunnel excavation starting point and execute
Work vertical shaft, general available Metro station excavation, as construction shaft, moves towards to be divided into tunnel some freezing along tunnel line
Section, each freeze section length is about 20～80 meters.At the inner excavation foundation ditch of U-lag frozen soil sealing Rotating fields, place open cut base
Subsoil water outside Keng enters U-lag.The effectively mean temperature of frozen soil sealing layer not higher than-10 DEG C, frozen soil sealing layer during excavation
Surface temperature is less than-3 DEG C.
The thickness of vertical frozen soil sealing layer 2 is according to parameters such as the excavation of foundation pit degree of depth, foundation ditch both sides Water And Earth Pressures, ground loads
Determining, need to meet the requirement of soil at both sides stability, its thickness is intended to be 1.0m～3.0m scope, vertical frozen soil sealing layer 2 deep
Degree should be greater than the degree of depth of horizontal frozen soil sealing layer at tunnel floor.
Level is arranged at below tunnel floor to frozen soil sealing layer 1, forms the hoop frozen soil sealing collar closed, and level is to freezing
The thickness of soil sealing layer 1 is intended to be 1.0m～3.0m scope.Level determines according to freeze section length to the length of frozen soil sealing layer 1,
It is intended to be 20～80m.
The construction of vertical frozen soil sealing layer 2: at foundation ditch both sides correspondence position, certainly face down and directly set vertical freezing
Hole, arranges vertical freezing pipe 3 in vertical freezing hole, freezing hole diameter is in 50mm～200mm, freezing hole spacing 500～1000mm.
Level is to the construction of frozen soil sealing layer 13: in the construction shaft of tunnel starting point or the work in each freeze section junction
The level that sets as hole is to freezing hole, and level arranges level to freezing pipe 4 in freezing hole, and level is arranged at the bottom of foundation ditch to freezing hole
Portion, freezing hole diameter intends selecting 50mm～200mm, freezing hole spacing 500～1000mm, freezing hole and tunnel floor structure foreign steamer
Wide clear spacing is intended to be 200～800mm.Lower freezing pipe in freezing hole, lower tube for transfusion in freezing pipe.
In order to reduce energy resource consumption, improve the heat insulation effect of refrigeration system, lay heat-insulation layer on ground, foundation ditch both sides, at U
Spray thermal insulation concrete 5 inside shape groove water sealing structure, collectively form heat-insulation system.Ground insulating layer 6 can be selected for eps foam plate,
The heat preservation plate materials such as polystyrene, extruded sheet, polyurethane sheet.Injection thermal insulation concrete 5 inside U-lag water sealing structure is opened with foundation ditch
Digging and successively spray, jet thickness is intended to be 10～30cm.Thermal insulation concrete 5 be also called air entrained concrete, foam concrete, foaming mix
Solidifying native, belong to the category of heat preserving and insulating material, can stop or reduce and extraneous generation heat exchange, that reduces heat dissipation has one
Determine the special concrete of Physical and mechanical properties.
Thermal insulation concrete uses the construction of wet shot method, in order to reduce the mobility of foam concrete, improves viscosity and attachment
Power, increase in foam concrete 0.5%～2% (BASF) efficiently accelerator, 0.5%～(ternary) latex powder of 2% and
The fiber of 3%～7%.
Provide below the construction method of above-mentioned open trench tunnel water sealing structure, specifically include:
Step 101, is divided into multiple construction section by constructing tunnel；
Step 102, each construction section excavation starting point construction shaft is set；
Step 103, freezing pipe creeps into work；
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 craft repair welding, temperature tube and the same freezing pipe of hydrology pipe tubing.Feed pipe ф 62 × 6mm can be selected for 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 250l/min.Rig and
Slush pump general power is 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 accuracy
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 controls 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 spreads
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 104: be drilled down into vertical freezing hole from ground, at tunnel floor in the both sides of default tunnel open excavation foundation ditch position
Lower section creep into freezing hole, in freezing hole under enter freezing pipe, in described freezing pipe under enter feed pipe；
This step specifically includes:
Step 104-1, freezing hole perforate
Freezing hole can use Φ 160mm diamond core drill perforate.Each boring mounting hole pipe, orifice tube can use ф 159
× 8mm seamless steel pipe is processed.When creeping into, orifice tube mounting hole sealing device.
Step 104-2, 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 after projected depth under freezing pipe
Seal header joints.
2. in order to ensure borehole accuracy, it is crucial that perforate section is crept into.When creeping into front 10～20m, to repeatedly check drilling rod side
To, adjust rig position, and can continue to creep into after theodolite or gyroscope detection deflection no problem.
3. under freezing pipe in hand-hole before want first pipe arrangement, it is ensured that freezing pipe concentricity.Under after good freezing pipe, carry out with inclinometer
Deviational survey, then the repetition measurement freezing hole degree of depth.Freezing pipe length and the qualified rear sealing freezing pipe head of deflection, and carry out suppressing leak test.
Freezing hole leak test Stress control, between 0.7～1.0MPa, stablizes 30 minutes unchanged persons of pressure 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, the support that feed pipe bottom welding 0.2m is high.So
Rear installation is gone, loop Cornu Caprae seu Ovis and freezing pipe end cap.
Thermometer hole construction method is identical with freezing pipe.
Step 105, install freeze refrigeration system, will freeze refrigeration system respectively with freezing pipe 13, thermometer hole, feed pipe phase
Even；
The installation diagram freezing refrigeration system is referred to accompanying drawing 2.Installation steps specifically include:
Step 105-1, freezes refrigeration plant type selecting and circuit design
1. can be selected for YSKF600 type freezing unit 1 to overlap, each 2 sets of YSKF300 type freezing unit (wherein 1 set is standby).Work as salt
Coolant-temperature gage is at-30 DEG C, and 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, motor
Power 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, a length of 380m of salt water conduit tube.Collect, join
Liquid pipe is 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.Install in Brine Pipe outlet
Effusion meter.
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 uses calcium chloride molten
Liquid is as freeze cycle saline.Saline proportion is 1.265.
Step 105-2, 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, brine pump 12, clarified water pump
8, cooling tower 14 and clear water reserviors etc..Equipment is installed and is carried out by the requirement of equipment operating manual.
At water pump import and export, salt water conduit tube two ends, control valve is installed between collection brine distributing ring and frigo.Enter at condenser
Point for measuring temperature is installed in outlet；Going to salt water conduit tube two ends, loop, temperature and pressure measuring point is installed；Install in the outlet of loop salt water conduit tube
Electromagnetic flowmeter；Between each frigo and collection brine distributing ring, flow measurement loop is installed；At brine tank, liquid level instruction report is installed
Alert device.
In certain embodiments, Freezing Station assembled prefabricated house, clear height 3.5 meters, baffle, clear water reserviors are laid in wall and roof
With brick masonry, cement plaster, pond is high 0.7 meter.
Step 105-3, 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 pipe support is consolidated
It is scheduled on the active well borehole wall.Thermometer, Pressure gauge and effusion meter are installed and are carried out by design.Saline line is used after leak test, cleaning
Polystyrene foam plastics is incubated, and insulation layer thickness is 50mm, and the outside plastic sheeting of heat-insulation layer is wrapped up.
The vaporizer of freezing unit and cryogenic pipe flex foam insulation thick for 50mm, brine tank and salt water conduit tube
With polystyrol plastic foam plate insulation thick for 50mm.
Step 105-4, 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 saline
Concentration 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 higher than salt
Brine tank is overflowed when the freezing pipe saline of tank port refluxes.
Unit fills fluorine and fridge refuels and carries out according to the requirement of equipment operating manual.First the inspection of refrigeration system is carried out
Leakage and nitrogen rinse, and after guaranteeing system ne-leakage, then fill fluorine oiling.
Step 106, carries out freeze operation, builds vertical frozen soil sealing layer, level to frozen soil sealing layer；
This step includes:
Step 106-1, freezing system test running with actively freeze
Equipment carries out debugging and test running after installing.When test running, each state such as pressure, temperature to be regulated at any time
Parameter, makes unit 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 freezing system operational factor if desired.Freezing system enters after working well and actively freezes.In requiring one week
Brine temp is down to less than-20 DEG C.
Step 106-2, 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 that frozen soil sealing layer reaches according to observed temperature
After design thickness, then squeeze into inside frozen soil sealing layer more than 2m in non-frozen soil with core drill, confirm in frozen soil sealing layer without dynamic water.
It is then possible to subregion opens the active well borehole wall.After being excavated in soil layer, thickness, surface temperature and the change of actual measurement frozen soil sealing layer
Shape, as reached to design requirement, then can enter normal construction, 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 brine flow are freezed in the maintenance during excavation
With actively freeze identical, as in construction according to site-test analysis, really prove that frozen soil sealing layer expansion rate is faster than anticipated, freeze
Soil sealing layer has enough bearing capacities and stability, has met design requirement, can properly increase brine temp, but the highest can not
Higher than-20 DEG C.After starting to do liner, in the case of guaranteeing outer lining safety, brine temp can be improved, stop the most in advance freezing
Knot.
Step 107, when vertical frozen soil sealing layer, level to frozen soil sealing layer thickness and intensity reach preset requirement
After, frozen construction enters after safeguarding freezing period, successively excavation pit；
When frozen soil layer effective thickness and intensity reach requirement, frozen construction enters safeguards after freezing period successively excavation pit,
During excavation, first select the soil layer that hand excavation does not freezes, recycling pneumatic pick driving frozen soil.Note: freezing curtain exposure temperature
Degree must not be higher than-5 DEG C, and open-assembly time controls in 24h.
Step 108, builds tunnel lining structure.
This step specifically includes:
Step 108-1, 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.Thermal insulation concrete uses
Wet shot method is constructed, and in order to reduce the mobility of foam concrete, improves viscosity and adhesive force, increases in foam concrete
The efficient accelerator of BASF, 0.5%～2% of 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 108-2, pours Tunnel Second Lining
Tunnel-liner should ensure that lining thickness and lapped length of steel bar.Strictly controlling to measure, prevent tunnel to owe to dig, reinforcing bar is tied up
During bundle, 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, determined by test
Optimum mix, and be strictly controlled by, make 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
Build inner outline, and outwards less than 50mm, be responsible for footman's survey crew, and stifled good bulkhead, to ensure outside form joint
Not spillage liquid.
For accelerating concrete hardening and preventing local freezing, add the J851 of cement weight 2.5%～4% in concrete early
Strong antifreeze water reducer and the MRT early strength antifreezing agent of cement weight 3%～4%, both materials have improve concrete and easily
Property and density, the anti-permeability performance of Concrete Structure and freexing tolerance, and construction time strengthen concrete vibrating, stop honeycomb fiber crops
Face.
Tunnel-liner should strengthen the seriality of concrete construction, strengthens concrete curing, to prevent frozen soil to concrete
There is freeze injury.
This utility model has the advantage 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 groundwater resources of preciousness,
Avoid simultaneously periphery that drainage construction causes neighbouring build, the sedimentation and deformation of structures.
(3) by arranging thermal insulation concrete between tunnel-liner and frozen soil sealing layer, improve the guarantor of frozen soil sealing layer
Warm nature energy, slow down transmitting with the heat in tunnel of frozen soil sealing layer, considerably reduces and freeze expense.
The foregoing is only preferred embodiment of the present utility model, be not limited to this utility model, for this
For the technical staff in field, this utility model can have various modifications and variations.All in spirit of the present utility model and principle
Within, any modification, equivalent substitution and improvement etc. made, within should be included in protection domain of the present utility model.
Claims (9)
1. the open trench tunnel water sealing structure being used for protecting groundwater environment, it is characterised in that including: be arranged at tunnel open excavation
The vertical frozen soil sealing layer of foundation ditch both sides, and the level bottom described tunnel open excavation foundation ditch that is arranged at is to frozen soil sealing layer, described
Vertical frozen soil sealing layer and described level intersect to frozen soil sealing layer, and the bottom of described vertical frozen soil sealing layer is less than described level
Bottom to frozen soil sealing layer.
2. as claimed in claim 1 for protecting the open trench tunnel water sealing structure of groundwater environment, it is characterised in that described tunnel
Heat-insulation layer is laid on ground, open-cut foundation ditch both sides, road.
3. as claimed in claim 1 for protecting the open trench tunnel water sealing structure of groundwater environment, it is characterised in that described perpendicular
It is injected with thermal insulation concrete to the medial surface of frozen soil sealing layer to medial surface and the described level of frozen soil sealing layer.
4. as claimed in claim 1 for protecting the open trench tunnel water sealing structure of groundwater environment, it is characterised in that described perpendicular
Thickness to frozen soil sealing layer is 1～3 meter.
5. as claimed in claim 1 for protecting the open trench tunnel water sealing structure of groundwater environment, it is characterised in that described water
Put down to the thickness of frozen soil sealing layer be 1～3 meter.
6. as claimed in claim 1 for protecting the open trench tunnel water sealing structure of groundwater environment, it is characterised in that adjacent two
Distance between individual described tunnel open excavation foundation ditch is 20～80 meters.
7. as claimed in claim 1 for protecting the open trench tunnel water sealing structure of groundwater environment, it is characterised in that described water
Put down to the mean temperature of frozen soil sealing layer and described vertical frozen soil sealing layer not higher than-10 DEG C.
8. the open trench tunnel water sealing structure for protecting groundwater environment as described in any one of claim 1-7, its feature exists
In, described vertical frozen soil sealing layer includes vertical freezing hole, a diameter of 50～200 millimeters of described vertical freezing hole, described water
Equalling the spacing between freezing hole is 500～1000 millimeters.
9. the open trench tunnel water sealing structure for protecting groundwater environment as described in any one of claim 1-7, its feature exists
Include level to freezing hole in, described level to frozen soil sealing layer, described level to a diameter of 50～200 millimeters of freezing hole,
Described level spacing between freezing hole is 500～1000 millimeters；Described level is to freezing hole and tunnel floor panel structure foreign steamer
Wide clear spacing is 200～800 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620586909.4U CN205804382U (en) | 2016-06-16 | 2016-06-16 | For protecting the open trench tunnel water sealing structure of groundwater environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620586909.4U CN205804382U (en) | 2016-06-16 | 2016-06-16 | For protecting the open trench tunnel water sealing structure of groundwater environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205804382U true CN205804382U (en) | 2016-12-14 |
Family
ID=58142308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620586909.4U Active CN205804382U (en) | 2016-06-16 | 2016-06-16 | For protecting the open trench tunnel water sealing structure of groundwater environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205804382U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105908765A (en) * | 2016-06-16 | 2016-08-31 | 中铁工程设计咨询集团有限公司 | Open-excavated tunnel water stopping structure for protecting groundwater environment and construction method |
| CN114263162A (en) * | 2021-12-31 | 2022-04-01 | 中国矿业大学 | Pre-control freezing method for stratum with flowing water |
-
2016
- 2016-06-16 CN CN201620586909.4U patent/CN205804382U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105908765A (en) * | 2016-06-16 | 2016-08-31 | 中铁工程设计咨询集团有限公司 | Open-excavated tunnel water stopping structure for protecting groundwater environment and construction method |
| CN105908765B (en) * | 2016-06-16 | 2018-11-30 | 中铁工程设计咨询集团有限公司 | For protecting the open trench tunnel water sealing structure and construction method of groundwater environment |
| CN114263162A (en) * | 2021-12-31 | 2022-04-01 | 中国矿业大学 | Pre-control freezing method for stratum with flowing water |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105908765B (en) | For protecting the open trench tunnel water sealing structure and construction method of groundwater environment | |
| CN105909260B (en) | Subway station water stop structure for protecting groundwater environment and construction method thereof | |
| JP7141650B2 (en) | Freezing method and freezing system for connecting passages | |
| CN104695964B (en) | Subway shield tunnel freeze entering method | |
| CN104963334B (en) | Reinforced with slip casting freezing pipe and freeze the construction method that service channel suppresses frozen swell and melt settlement | |
| CN106121686B (en) | Underground excavation tunnel water stop structure for protecting groundwater environment and construction method thereof | |
| CN108035335B (en) | Method for constructing shaft type underground parking garage by freezing method | |
| CN104074525B (en) | Full-face pouring, rectangular horizontal are freezed and pipe canopy joint reinforcement structure and method | |
| CN103015402B (en) | Construction method for inhibiting frost heaving and thaw collapse of horizontally frozen end through cement-soil reinforcement method | |
| CN109208637A (en) | Increase the construction method of open-cut station newly on the basis of existing tunnel | |
| CN101463724A (en) | Construction method for connection passage by double-row hole horizontal freezing method | |
| CN101418567A (en) | Protective cutting construction method for tunnel segment | |
| CN102619522A (en) | Construction method for subway contact passage | |
| CN1614152A (en) | Constructing method for in tunnel weak soil layer by freezing method horizontally | |
| CN205260038U (en) | Wall reinforced structure is freezed to shield tunnel end box | |
| CN109209396A (en) | A kind of shield tunnel end joint reinforcement structure and construction method | |
| CN108071400A (en) | Horizontal freezing consolidation combines shield driving construction method with steel jacket box | |
| CN108843328A (en) | A kind of Metro Connection Passage excavation construction support construction method | |
| CN107034874B (en) | Double-screw type slip casting type freezing plant and construction method | |
| CN205669398U (en) | A undercut tunnel stagnant water structure for protecting groundwater environment | |
| CN203626848U (en) | Railway shield tunnel end jointly reinforced by horizontal freezing holes and pipe shed | |
| CN111236947A (en) | Construction method of vertical freezing subway shaft | |
| CN205804382U (en) | For protecting the open trench tunnel water sealing structure of groundwater environment | |
| CN208718670U (en) | Frost wall building enclosure in the construction of portal ring beam | |
| CN104963341B (en) | A kind of manifold type earth source heat pump mixing backfilling process and backfill material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |