CN106089214A - Service channel manual pipe jacking reinforced construction method - Google Patents
Service channel manual pipe jacking reinforced construction method Download PDFInfo
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- CN106089214A CN106089214A CN201610452159.6A CN201610452159A CN106089214A CN 106089214 A CN106089214 A CN 106089214A CN 201610452159 A CN201610452159 A CN 201610452159A CN 106089214 A CN106089214 A CN 106089214A
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- 238000010276 construction Methods 0.000 title claims abstract description 74
- 238000007710 freezing Methods 0.000 claims abstract description 84
- 230000008014 freezing Effects 0.000 claims abstract description 84
- 238000009412 basement excavation Methods 0.000 claims abstract description 36
- 239000002689 soil Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000013461 design Methods 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 12
- 238000007569 slipcasting Methods 0.000 claims abstract description 11
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 238000012423 maintenance Methods 0.000 claims abstract description 5
- 239000012267 brine Substances 0.000 claims description 28
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000004567 concrete Substances 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 238000007596 consolidation process Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 9
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 8
- 239000011780 sodium chloride Substances 0.000 claims description 8
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 7
- 239000001110 calcium chloride Substances 0.000 claims description 6
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 6
- 229910052731 fluorine Inorganic materials 0.000 claims description 6
- 239000011737 fluorine Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 239000011378 shotcrete Substances 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000005057 refrigeration Methods 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 241000251468 Actinopterygii Species 0.000 claims description 4
- 230000011218 segmentation Effects 0.000 claims description 4
- 230000005641 tunneling Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 241000196324 Embryophyta Species 0.000 claims description 3
- 235000004431 Linum usitatissimum Nutrition 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 claims description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 1
- 241000208202 Linaceae Species 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- 239000004927 clay Substances 0.000 description 16
- 239000010410 layer Substances 0.000 description 10
- 150000003839 salts Chemical class 0.000 description 7
- 239000004576 sand Substances 0.000 description 7
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 240000009087 Crescentia cujete Species 0.000 description 4
- 235000005983 Crescentia cujete Nutrition 0.000 description 4
- 235000009797 Lagenaria vulgaris Nutrition 0.000 description 4
- 235000013312 flour Nutrition 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 240000006240 Linum usitatissimum Species 0.000 description 2
- 230000003466 anti-cipated effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000004746 geotextile Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 229920006327 polystyrene foam Polymers 0.000 description 2
- 241000283898 Ovis Species 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000012407 engineering method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000003913 materials processing Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002984 plastic foam Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 210000004911 serous fluid Anatomy 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The present invention provides a kind of service channel manual pipe jacking reinforced construction method, including preparation of construction, freeze front construction, curtain freezes, excavation construction and supporting and five stages of last lining cutting slip casting, specifically include as follows: first carry out preparation of construction work, then in the case of guaranteeing Frozen Soil Cylinder thickness, offer freezing hole, set up short distance orifice tube, freezing pipe creeps into and uses with tube method is crept into, freezing system enters after running well and actively freezes again, after Frozen Soil Cylinder reaches design requirement, freezing system enters maintenance to be freezed；After completing above operation, enter excavation construction and supporting and last lining cutting slip casting.This construction method reduces Freezing Method for Cross-passage Construction difficulty, adds the safety of engineering, reliability, shortens construction period and cost simultaneously, ensures construction quality while improving efficiency of construction.
Description
Technical field
The present invention relates to subway work Technology field, specifically refer to service channel manual pipe jacking reinforced construction method.
Background technology
Service channel is normally at lowest part in the middle of subway tunnel, is to there is unexpected peace in operation at subway train
Full accident be need timely passenger is transferred to safety area.Although Metro Connection Passage builds the most about one-hundred-year history,
But because of service channel, but because service channel buried depth is relatively big, geological and hydrological conditions are more complicated and by constructing tunnel place and construction week
The objective circumstances such as surrounding environment is limited, its construction technology content is high, difficulty is big, so its arrangement and method for construction is the most difficult of great satisfaction.
The frozen construction method used in service channel engineering construction at present is mostly the most conservative, i.e. strengthens Frozen wall thickness or reduction is frozen
Junction temperature.Although truly having the safety that ensure that engineering and surrounding enviroment of power, but also consuming huge electric energy and fund, also will
Difficulty is brought to the excavation in later stage.This makes the engineer applied of freezing process be extremely restricted.
Summary of the invention
In order to solve above technical problem, the present invention provides a kind of service channel manual pipe jacking reinforced construction method, including
Following steps:
(1) preparation of construction: lay power cable, two water pipes in tunnel to construction working face；It is the wood of 5cm with thickness
Plate is laying construction place at service channel；
(2) freeze front construction: before using total powerstation and level gauge monitoring perforate and during perforate, face upward Fu Jiao and azimuth up and down, bore
The deflection in hole should control within 1%, and in the case of guaranteeing Frozen Soil Cylinder thickness, whole pitch of holes is not more than 1.0m.Go out in aperture
Set up design orifice tube.By chipping at aperture during installation, good and sound four setscrews, then at the fish scale button of orifice tube
On twined the sealer such as flax silk or staple, orifice tube is pounded into, tightens with setscrew, remove nut after tightening again, load onto
DN125 ball valve, then ball valve is opened, with hole making drill from ball valve open interior, opening diameter is 91mm.Freezing pipe creeps into employing with pipe
Method is crept into；
(3) curtain freezes: include installing freeze refrigeration plant be connected with Freezing Station, pipeline, pipe insulation and pipeline detector
Table is installed；Dissolve calcium chloride and unit fills fluorine and refuels, equipment debugging and test running, enter actively after freezing system runs well
Freezing, in one week, brine temp is down to less than-20 DEG C, and within 15 days, brine temp is down to less than-24 DEG C, and reaches to set at Frozen Soil Cylinder
After meter requires, freezing system enters maintenance to be freezed；
(4) excavation construction and supporting: include passage driving and gib, is carrying out preparation of construction and is confirming permissible through exploration drilling
After formally excavating, open steel pipe sheet, from the line direction tunneling to the right of left line opening.Operation uses pneumatic pick, shovel and pickaxe to tie mutually
Close.Excavation uses upper and lower benching tunnelling method excavation, and excavation step pitch is 0.5m；
Grid steel frame sets up after excavation in time, spacing 0.5m, and the tolerance of bow member spacing and lateral attitude thereof and elevation is
± 5cm, perpendicularity is ± 2 °, gunite concrete use segmentation, piecemeal, order from bottom to top carry out and first spray reinforcing bar grid with
Concrete support between wall, sprays concrete support between two reinforcing bar grids the most again；
(5) last lining cutting slip casting: including pump house base plate, channel base plate and side wall construction, filling and injecting slurry, wherein grouting pressure exists
Between 0.5Mpa.
Further, described freezing hole has 69 a diameter of 89mm, and forms 22 and freeze loop；Described freezes
Hole by facing upward, nearly level, three kinds of angles of nutation be arranged in the surrounding of passage, freezing hole is designed to pitch of holes service channel periphery hole
For 900mm；Described temperature observation hole sets 8 a diameter of 89mm altogether, and described relief hole is provided with 4, a diameter of 45mm；Described
Freezing hole and horizontal line angulation be-20 ° 20 °.
Further, use screw thread to be welded with between described freezing pipe and connect method of attachment in succession, after joint screw thread fastening again
Electric arc welding by hand.
Further, described pipeline link uses Flange joint；Described saline and clear water pipeline are pressure respectively
0.7MPa and 0.3Mpa.
Further, in described freezing system, brine circulation system goes the loop temperature difference less than 2 DEG C.
This construction method reduces Freezing Method for Cross-passage Construction difficulty, adds the safety of engineering, reliability, shortens simultaneously and execute
Work cycle and cost, ensure construction quality while improving efficiency of construction.
Accompanying drawing explanation
Fig. 1 is that freezing hole of the present invention arranges elevation.
Fig. 2 is the present invention left line freezing hole plane of arrangement figure.
Fig. 3 is the present invention right line freezing hole plane of arrangement figure.
Detailed description of the invention
Embodiment 1.
Wuhan Rail Transit No. six long 13.828m of line service channel, wide 3.8m, maximum height 6.96m, channel roof is buried
Deep 19.97m, uses brine circulation system engineering with artificial freezing method soil mass consolidation, mine shallow mining method, it is contemplated that consolidation by freezing length
13.828m, reinforces width 9.8m, degree of depth 13.850m.In anticipated freezing range, the soil body is followed successively by silty clay from top to bottom, sticks
Soil, Muddy Bottoms clay, silty clay folder flour sand, average natural moisture content is between 33% ~ 49%, and wherein silty clay, clay are
The soft shape soil layer of moulding of high-compressibility, silty clay folder flour sand is the soft shape soil layer of moulding of middle compressibility, and Muddy Bottoms clay is in liquid-plastic state.
Its unconfined compressive strength is between 34.32 ~ 42.78KPa, and bearing capacity is poor.The subsoil water master in location residing for service channel
If the soil water in weak soil, the water yield is less, and wherein the subsoil water in silty clay folder silty sand ground is by lower angle gravel bed artesian water
Impact, the water yield is less.Passage is arranged above present situation road, requires higher to surface subsidence control.Use preliminary bracing+secondary lining
Structure.
A kind of service channel manual pipe jacking reinforced construction method, it is characterised in that: described consolidation by freezing construction method bag
Include following steps.
(1) preparation of construction
1) according to power supply for construction and construction water requirement, in tunnel, power cable, two water pipes are laid to construction working
Face；With plank laying construction place at service channel of thick 5cm, set up for construction scaffolding, materials processing and equipment are laid
Site condition is provided.
(2) front construction is freezed
1) locating holes and orifice tube are installed: according to design requirement, utilize total powerstation that freezing hole position is carried out line setting.
Selecting J-200 type diamond drill perforate, join φ 133mm diamond core bit, hole depth about 300mm, not drill section of jurisdiction
Control.With gad wedge break rock core, take out after, squeeze into the orifice tube processed, and set 4 fixing points and be fixed；
2) opening arrangement is installed: by chipping at aperture, good and sound four setscrews, then the fish scale at orifice tube is buckled and twined fiber crops
The sealers such as silk or staple, pound into orifice tube, tighten with setscrew, remove nut after tightening again, load onto DN125 ball
Valve, then ball valve is opened, with hole making drill from ball valve open interior, opening diameter is 91mm.Run through concrete section of jurisdiction, if the mud in stratum
Discharge shuts valve the most in time.With screw, opening arrangement is contained on ball valve, work progress notes added gasket seal；
3) freezing hole creeps into and freezing pipe is installed: using MD-80 drill hole of drilling machine, adapted BW250 type slush pump, drilling tool utilizes φ 89
× 8 freezing pipes make drilling rod, and freezing pipe creeps into and uses with tube method is crept into；Use screw thread to be welded with between freezing pipe to connect the most in succession
Method, electric arc welding the most by hand after joint screw thread fastening, under normal circumstances, simple drill bit is installed when creeping into, if crept into
Difficulty runs into layer of sand, for preventing from creeping into middle sand return, installs a special one-way cock at drill bit position.It is deep that freezing pipe arrives design
Degree afterflush check valve, and seal freezing pipe end.In drilling process, strict monitoring deflection situation, finds that deflection to be entangled in time
Partially, after lower good freezing pipe, carry out the repetition measurement of freezing pipe length, then carry out deviational survey and draw hole scattering figure.Freezing pipe length
After qualified with deflection, then freezing pipe being suppressed leak test, after freezing pipe installs, cement injection seals freezing pipe and section of jurisdiction
Between gap.Thorough investigation design requirement drills through freezing hole and has 69, and numbering is by D1 to D69；Temperature observation hole sets 8 altogether, number by
C1 to C8;Relief hole is provided with 4, and numbering is by X1 to X4, shown in table specific as follows:
。
(3) curtain freezes
1) Freezing Station Housing, Furniture, Furnishing And Equipment is installed: equipment is installed and carried out by the requirement of equipment operating manual.For ensureing refrigeration system
Reliably continuously running, Freezing Station selects JYSLGF-300 III 2 sets of type screw freezing unit, and two sets operate, a set of standby；Choosing
With IS150-400A brine pump and IS150-250A type cooling water circulating pump each 1, it is a preparation and a use；；If brine tank 2,
Each volume 6m；Salt water conduit tube and collection liquid distribution pipe all select φ 159 × 5mm seamless steel pipe, collection liquid distribution pipe to be connected selection with Cornu Caprae seu Ovis
φ 51mm high-pressure rubber pipe；Cooling water pipe φ 127 × 5mm seamless steel pipe；Freezing plate φ 48 × 4mm steel pipe is processed；In freezing
Mounting temperature sensor on machine water inlet pipe and water outlet pipe, installs pressure, temperature sensor and control valve going, in the saline line of loop,
At brine tank, liquid level sensor is installed；Two, valve is installed between brine distributing ring and frigo, in order to control freezing device salt current
Amount；Eminence in saline line installs vent valve；Outlet salt water conduit tube is installed check valve；Saline and pressure point of clear water pipeline
Wei 0.7MPa and 0.3Mpa；
2) pipeline connects, is incubated and test instrumentation installation: pipeline Flange joint, the Brine Pipe pipe support in tunnel is laid in
On tunnel duct piece, and it is current to avoid affecting tunnel.Expansion joint to be arranged, valve in saline line and cooling water circulation pipeline
Door and the testing element such as temperature measurer, Pressure gauge.Saline line is incubated with polystyrene foam plastics after leak test, cleaning, insulation
Thickness is 30mm, and the outside plastic sheeting of heat-insulation layer is wrapped up.Collection brine distributing ring and the connection high-pressure rubber pipe of freezing pipe, every freezes
One, import and export each dress valve of knot pipe, to control flow.Service channel surrounding main freezing hole each two one is connected, and other freezes
Knot every three one series connection in hole.The vaporizer of freezing unit and cryogenic pipe polystyrene foam plastics 30mmPEF warming plate, salt
Water tank and salt water conduit tube are incubated with polystyrol plastic foam plate thick for 30mm；
3) dissolve calcium chloride and unit fills fluorine and refuels: saline (calcium chloride solution) proportion is 1.26～1.27, first in brine tank
It is full of clear water, dissolves calcium chloride, be re-fed in salt water conduit tube, till brine system is full of, to remove when dissolving calcium chloride
Impurity.Unit fills fluorine and fridge refuels and must carry out according to the requirement of equipment operating manual.First refrigeration system is carried out
Leak detection and nitrogen rinse, and after guaranteeing system ne-leakage, then fill fluorine oiling；
4) 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 about technological procedure and equipment requirements.In freezing process,
Timing detection brine temp, brine flow and Frozen Soil Cylinder spread scenarios, freezing system enters after working well and actively freezes.Want
Ask freezing hole single hole flow not less than 5m/h；Actively freeze 7 days brine temps and be down to less than-20 DEG C；Actively freeze 15 days
Brine temp is down to less than-24 DEG C, goes loop salt water temperature difference to be not more than 2 DEG C；During excavation, brine temp is down to less than-28 DEG C.
As brine temp and brine flow do not reach design requirement, positive freeze-off time should be extended.
(4) excavation construction and supporting
1) excavation condition analysis is freezed with maintenance
In positive freezing process, to judge whether Frozen Soil Cylinder is handed over circle and reach design thickness according to observed temperature data, with
Time Frozen Soil Cylinder to be monitored and tunnel cementing situation, thermometric judges that Frozen Soil Cylinder is handed over and encloses and reach design thickness and complete with tunnel
Carrying out inspecting hole examination after the most cementing again to dig, in confirming Frozen Soil Cylinder, the basic no pressure of soil layer formally excavates；
1. thermometer hole analysis
According to thermometer hole measured data, calculate frozen soil development speed and develop radius at this frozen soil, drawing further according to becoming ice formula
Freezing curtain mean temperature, if each layer of position, the thickness of position freezing curtain and mean temperature reach after design requires, through excavation
Section of jurisdiction can be opened after front nodal point acceptance(check) excavate；
2. pressure relief vent is freezing the typically no pressure of initial stage pressure relief vent, and along with the gradually extension of frozen soil, moisture constantly migrates, and hands over circle
Rear frozen soil forms the soil body closed, and frost-heaving force can not get release and is gradually increased, and pressure relief vent pressure increases after release,
Pressure recovers the most rapidly, and after repeatedly release, pressure gradually declines then, and final pressure is zero, basic no pressure in freezing curtain,
Substantially flow out without muddy water in pressure relief vent, possess examination and dig condition；
3. inspecting hole is before excavation, sets inspecting hole at left and right line hole making drill at freezing curtain weak place, to judge to freeze curtain
Tent thickness and freezing efficiency；
4. water go, the loop temperature difference
Brine circulation system goes the loop temperature difference less than 2 DEG C.Determine open section of jurisdiction carry out excavating also need to combine thermometer hole data,
The aspects such as pressure relief vent pressure, inspecting hole situation consider.Actively freeze brine temp and be adjusted to-28 DEG C～-30 DEG C, after excavation,
For guaranteeing the stability of Frozen Soil Cylinder, brine temp still controls between-28 DEG C～-30 DEG C；
2) safety door is installed: installs emergent protective door on excavation tunnel, side reserved opening, and is equipped with air quantity not less than 6m/min
Air compressor machine to protective door supply.Protective door switch should be easy to manual operation, and does not affect construction.Fastening bolt, airduct and company
The accessory such as fitting, spanner and operation instrument should prepare to put in place.Dig through dismountable protective door after horizontal channel completes preliminary bracing；
3) examination is dug and open pipe sheet: soil mass consolidation intensity reach design require and preparation ready after first to carry out examination and dig, i.e. exist
Opening an examination in the middle part of the excavation area do not freezed and dig window, window size is not preferably greater than 400 × 400mm, windows and progressively to expand.With
Spade, pneumatic pick etc. dig window from examination and dig deep 400～600mm, check that the soil body is aqueous and stable case.If the soil body is dried, is able to support oneself, or
Person digs and is deep to 800～1000mm without muddy water delivery time lasting more than 24h.Then can determine that possess formal excavation condition.Otherwise should
Window is dug in backfill, closing examination, continues actively to freeze, till examination next time is dug and met above-mentioned requirements；
During open pipe sheet, prepare 2 32t jack, each one of 5t and 2t chain block.Two jack stands are by open pipe sheet two
Side, centre is joined directly together with steel pipe sheet with a crossbeam, and by pushing tow crossbeam outside push-and-pull steel pipe sheet, 5t calabash is as main drawing
Section of jurisdiction use, one end hooks section of jurisdiction to be torn open, and one end is hitched over there on tunnel duct piece, the afterburning drawing pipe in tunnel of horizontal direction
Sheet.2t calabash is suspended in above section of jurisdiction to be torn open on section of jurisdiction, and section of jurisdiction to be torn open is hooked in one end, in case pounding suddenly in work during the pull-out of section of jurisdiction
Make on platform.During with jack and 5t calabash drawing it is noted that observing tube off-chip is shifted one's love condition, and note at any time adjusting 2t calabash
Reed degrees of tensions and direction.During because of section of jurisdiction corrosion pull-out difficulty, application sledgehammer hammer vibration tube sheet, reduce and extract pulling force.Because of secondary orifices side
For reinforced concrete segment, section of jurisdiction uses pneumatic pick to abolish, has a shave by hand herein, constructs in strict accordance with design size；
4) excavation construction: section of jurisdiction enters formal excavation after removing, service channel excavation construction takies near service channel left
The tunnel excavation of side, sets up work platforms at service channel opening part, utilizes tunnel as deslagging and transport of materials passage.Doing
Good preparation of construction and through exploration drilling confirm can formally excavate after, open steel pipe sheet, from the line direction tunneling to the right of left line opening.
Operation uses pneumatic pick, shovel and pickaxe to combine, and work surface casting handbarrow is shifted onto in the special casting case near well head, uses
Elevator winches to ground and discharges.Excavation uses upper and lower benching tunnelling method excavation, and excavation step pitch is 0.5m.Should be timely in digging process
Carry out convergent deformation monitoring, in order to adjustment support pattern and structure in time, and note the position of freezing pipe, in case pneumatic tools
Break freezing pipe.If breaking freezing pipe, Freezing Station personnel should be notified in time, closing valve, repair welding freezing pipe；
5) preliminary bracing grid processing, installation: grid steel frame sets up after excavation in time, spacing 0.5m, remove footing before installing
Under empty quarrel and foreign material, bottom connecting plate should on the soil body solid, firm if desired at connecting plate under the pad lumps of wood.Grillage
Tolerance is installed: the tolerance of bow member spacing and lateral attitude thereof and elevation is ± 5cm, and perpendicularity is ± 2 °.Grille arch
Frame is assembled in the scope of operation to be carried out, and tightens also with connecting plate bolt, it is ensured that connecting plate is closely connected between each joint bow member.By concrete after installation bow member
Protective layer is reserved, and forbids out break, steel grating hoop to set HRB400E22mm dowel spacing 1m in construction；
6) preliminary bracing gunite concrete: gunite concrete operation should closely follow excavated surface, uses segmentation, piecemeal, from lower
On order carry out and first spray reinforcing bar grid and wall between concrete, spray concrete between two reinforcing bar grids the most again；Injection is made
During industry, spiralling the most slowly is done in injection, and screw diameter about 20-30cm, to ensure that concrete ejection is closely knit.Slap simultaneously
Hold blast, hydraulic pressure and jet length, reduce the springback capacity of concrete；Rebound of shotcrete amount, abutment wall is not preferably greater than 25%；
7) construction of waterproof layer: service channel is held concurrently, and all to use 1.5mmPVC drainage systems entirely to wrap waterproof for waste water pump house, geotechnique
Cloth cushion uses the short fine geotextiles of 400g/.First geotextiles is fixed on concrete surface, then will with hot bonding method
Splash guard is pasted onto on fixing ring washer, i.e. uses without nail laying way, has no mechanical damage splash guard.
(5) last lining cutting slip casting
1) service channel and pump house secondary lining complete in just lining construction, carry out, first construction service channel and pump after waterproof layer
Room baseplate reinforcing bar, reserves passage and pump house side wall reinforcing bar, first construction pump house base plate, channel base plate and both sides 30cm height side wall,
Formwork erection pours concrete.Channel base plate is the most elongated to be poured, and centre does not set circular construction joint；
2) thaw collapse treatment measures: the same day, fall was heavy more than 0.5mm, or when service channel adds up sedimentation more than 1mm, should carry out thaw collapse
Compensation and grouting；Grouting serous fluid is single liquid cement mortar.Grouting pressure is not more than 0.5Mpa.Grouting sequence is first floor rear wall.Note
Slurry is front by fully open, during slip casting, when the continuous pulp of adjacent holes to the Grouting Pipe and its adjacent Grouting Pipe valve for the treatment of slip casting
Time close adjacent ports valve door, quantitatively can stop this hole slip casting after press-in, close valve then to adjacent hole slip casting.The knot of thaw settlement grouting
Bundle is with surface subsidence stabilization as foundation.If frost wall the most all melts, and in the case of not slip casting, survey stratum settlement
Within two weeks ground day settling amount is maintained at 0.5mm continuously, accumulative settling amount, less than 1mm, can stop thaw collapse and compensate note
Slurry.
Embodiment 2:
Wuhan one line service channel uses brine circulation system engineering with artificial freezing method soil mass consolidation, mine shallow mining method, it is contemplated that
Consolidation by freezing length 14.028m, reinforces width 10.8m, degree of depth 14.850m.In anticipated freezing range, the soil body is the most successively
For silty clay, clay, Muddy Bottoms clay, silty clay folder flour sand, average natural moisture content between 36% ~ 45%, wherein powder
Matter clay, clay are the soft shape soil layer of moulding of high-compressibility, and silty clay folder flour sand is the soft shape soil layer of moulding of middle compressibility, Muddy Bottoms clay
It is in liquid-plastic state.
A kind of service channel manual pipe jacking reinforced construction method, its consolidation by freezing construction method comprises the following steps:
(1) preparation of construction: lay power cable, two water pipes in tunnel to construction working face；It is the wood of 5cm with thickness
Plate is laying construction place at service channel；
(2) freeze front construction: before using total powerstation and level gauge monitoring perforate and during perforate, face upward Fu Jiao and azimuth up and down, bore
The deflection in hole should control within 1%, and in the case of guaranteeing Frozen Soil Cylinder thickness, whole pitch of holes is not more than 1.0m；Go out in aperture
Set up design orifice tube, by chipping at aperture during installation, good and sound four setscrews, then at the fish scale button of orifice tube
On twined the sealer such as flax silk or staple, orifice tube is pounded into, tightens with setscrew, remove nut after tightening again, load onto
DN125 ball valve, then ball valve is opened, with hole making drill from ball valve open interior, opening diameter is 91mm, and freezing pipe creeps into employing with pipe
Method is crept into；
(3) curtain freezes: include installing freeze refrigeration plant be connected with Freezing Station, pipeline, pipe insulation and pipeline detector
Table is installed；Dissolve calcium chloride and unit fills fluorine and refuels, equipment debugging and test running, enter actively after freezing system runs well
Freezing, in one week, brine temp is down to less than-20 DEG C, and within 15 days, brine temp is down to less than-24 DEG C, and reaches to set at Frozen Soil Cylinder
After meter requires, freezing system enters maintenance to be freezed；
(4) excavation construction and supporting: include passage driving and gib, is carrying out preparation of construction and is confirming permissible through exploration drilling
After formally excavating, open steel pipe sheet, from the line direction tunneling to the right of left line opening；Operation uses pneumatic pick, shovel and pickaxe to tie mutually
Closing, excavation uses upper and lower benching tunnelling method excavation, and excavation step pitch is 0.5m；
Grid steel frame sets up after excavation in time, spacing 0.5m, and the tolerance of bow member spacing and lateral attitude thereof and elevation is
± 5cm, perpendicularity is ± 2 °；Gunite concrete use segmentation, piecemeal, order from bottom to top carry out and first spray reinforcing bar grid with
Concrete support between wall, sprays concrete support between two reinforcing bar grids the most again；
(5) last lining cutting slip casting: including pump house base plate, channel base plate and side wall construction, filling and injecting slurry, wherein grouting pressure exists
Between 0.5Mpa.
After interval No. 1 service channel of No. 6 line the 4th bid section civil engineerings of Wuhan Rail Transit applies this engineering method, through 51
Actively freezing of it, consolidation by freezing is respond well, meets excavation condition.Actively freeze-off time is fewer 4 days than design 55 ~ 60 days,
Power cost saving 40,000 yuan, equipment leasing expense 100,000 yuan.Further, in positive freezing process, every technical parameter meets design to be wanted
Asking, frozen construction quality is good.
Claims (5)
1. a service channel manual pipe jacking reinforced construction method, it is characterised in that: described consolidation by freezing construction method includes
Following steps:
(1) preparation of construction: lay power cable, two water pipes in tunnel to construction working face；It is 5cm's with thickness
Plank is laying construction place at service channel；
(2) freeze front construction: before using total powerstation and level gauge monitoring perforate and during perforate, face upward Fu Jiao and azimuth up and down, bore
The deflection in hole should control within 1%, and in the case of guaranteeing Frozen Soil Cylinder thickness, whole pitch of holes is not more than 1.0m；Go out in aperture
Set up design orifice tube, by chipping at aperture during installation, good and sound four setscrews, then at the fish scale button of orifice tube
On twined the sealer such as flax silk or staple, orifice tube is pounded into, tightens with setscrew, remove nut after tightening again, load onto
DN125 ball valve, then ball valve is opened, with hole making drill from ball valve open interior, opening diameter is 91mm, and freezing pipe creeps into employing with pipe
Method is crept into；
(3) curtain freezes: include installing freeze refrigeration plant be connected with Freezing Station, pipeline, pipe insulation and pipeline detector
Table is installed；Dissolve calcium chloride and unit fills fluorine and refuels, equipment debugging and test running, enter actively after freezing system runs well
Freezing, in one week, brine temp is down to less than-20 DEG C, and within 15 days, brine temp is down to less than-24 DEG C, and reaches to set at Frozen Soil Cylinder
After meter requires, freezing system enters maintenance to be freezed；
(4) excavation construction and supporting: include passage driving and gib, carry out preparation of construction and through exploration drilling confirm can
After formally excavating, open steel pipe sheet, from the line direction tunneling to the right of left line opening；Operation uses pneumatic pick, shovel and pickaxe phase
In conjunction with, excavation uses upper and lower benching tunnelling method excavation, and excavation step pitch is 0.5m；Grid steel frame sets up after excavation in time, spacing
0.5m, the tolerance of bow member spacing and lateral attitude thereof and elevation is ± 5cm, and perpendicularity is ± 2 °；Gunite concrete uses
Segmentation, piecemeal, order from bottom to top carries out and first sprays concrete support between reinforcing bar grid and wall, spraying two reinforcing bar lattice the most again
Concrete support between grid；
(5) last lining cutting slip casting: including pump house base plate, channel base plate and side wall construction, filling and injecting slurry, wherein grouting pressure exists
Between 0.5Mpa.
A kind of service channel manual pipe jacking reinforced construction method the most according to claim 1, it is characterised in that described freezes
Knot hole has 69 a diameter of 89mm, and forms 22 and freeze loop；Described freezing hole by facing upward, nearly level, nutation three kinds
Angle is arranged in the surrounding of passage, and it is 900mm that freezing hole is designed to pitch of holes service channel periphery hole；Described temperature observation hole
Setting 8 a diameter of 89mm altogether, described relief hole is provided with 4, a diameter of 45mm；Described freezing hole and horizontal line angulation
For-20 ° 20 °.
A kind of service channel manual pipe jacking reinforced construction method the most according to claim 1, it is characterised in that described freezes
Screw thread is used to be welded with and connect method of attachment in succession between knot pipe, electric arc welding the most by hand after joint screw thread fastening.
A kind of service channel manual pipe jacking reinforced construction method the most according to claim 1, it is characterised in that described pipe
Road link uses Flange joint；Described saline and pressure respectively 0.7MPa and 0.3Mpa of clear water pipeline.
A kind of service channel manual pipe jacking reinforced construction method the most according to claim 1, it is characterised in that described freezes
In clone system, brine circulation system goes the loop temperature difference less than 2 DEG C.
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| CN106837388A (en) * | 2017-02-03 | 2017-06-13 | 天津大学 | Suitable for the detachable steel pipeline section of construction freezing method at tunnel connection channel |
| CN108397202A (en) * | 2018-03-06 | 2018-08-14 | 中交第二公路勘察设计研究院有限公司 | Freeze the leading excavation method of base tunnel in multi-step under advance support |
| CN108843334A (en) * | 2018-06-19 | 2018-11-20 | 中交公局厦门工程有限公司 | A kind of method of reinforcing building lower section rich water soft soil layer service channel |
| CN109083645A (en) * | 2018-08-01 | 2018-12-25 | 南宁轨道交通集团有限责任公司 | Shield tunnel and service channel method for synchronously constructing under the conditions of rich water round gravel stratum |
| CN110130316A (en) * | 2019-05-13 | 2019-08-16 | 南京林业大学 | The method of thaw collapse after service channel bottom pre-pouring grout system and control freezing construction |
| CN110454170A (en) * | 2019-08-19 | 2019-11-15 | 中铁十二局集团有限公司 | Tunnel connection channel construction method based on freezing process |
| CN110593918A (en) * | 2019-10-15 | 2019-12-20 | 中铁十二局集团有限公司 | Freezing method based tunnel connection channel pump house construction method |
| CN110905561A (en) * | 2019-12-16 | 2020-03-24 | 兰州理工大学 | Weak surrounding rock tunnel freezing initial support structure and construction method |
| CN111173536A (en) * | 2019-12-26 | 2020-05-19 | 中交一航局安装工程有限公司 | Freezing construction method for tunnel connection channel |
| CN111271095A (en) * | 2020-01-20 | 2020-06-12 | 中煤科工集团西安研究院有限公司 | Method for improving grouting effect of mine curtain |
| WO2020244677A1 (en) * | 2019-09-28 | 2020-12-10 | 中铁九局集团有限公司 | Freezing construction method for connecting passage, and freezing system |
| CN112112244A (en) * | 2020-08-13 | 2020-12-22 | 中国一冶集团有限公司 | Construction method of drainage channel in limited space |
| CN113494313A (en) * | 2021-06-25 | 2021-10-12 | 中铁一局集团有限公司 | Contact passage portal breaking construction method for main tunnel segment |
| CN115977650A (en) * | 2022-11-22 | 2023-04-18 | 安徽理工大学 | Communication freezing system based on plane skew connection channel and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106837388A (en) * | 2017-02-03 | 2017-06-13 | 天津大学 | Suitable for the detachable steel pipeline section of construction freezing method at tunnel connection channel |
| CN108397202A (en) * | 2018-03-06 | 2018-08-14 | 中交第二公路勘察设计研究院有限公司 | Freeze the leading excavation method of base tunnel in multi-step under advance support |
| CN108843334A (en) * | 2018-06-19 | 2018-11-20 | 中交公局厦门工程有限公司 | A kind of method of reinforcing building lower section rich water soft soil layer service channel |
| CN109083645A (en) * | 2018-08-01 | 2018-12-25 | 南宁轨道交通集团有限责任公司 | Shield tunnel and service channel method for synchronously constructing under the conditions of rich water round gravel stratum |
| CN110130316A (en) * | 2019-05-13 | 2019-08-16 | 南京林业大学 | The method of thaw collapse after service channel bottom pre-pouring grout system and control freezing construction |
| CN110454170A (en) * | 2019-08-19 | 2019-11-15 | 中铁十二局集团有限公司 | Tunnel connection channel construction method based on freezing process |
| JP2021534337A (en) * | 2019-09-28 | 2021-12-09 | 中▲鉄▼九局集▲団▼有限公司China Railway No.9 Group Co., Ltd | Freezing method and freezing system for connecting passages |
| JP7141650B2 (en) | 2019-09-28 | 2022-09-26 | 中▲鉄▼九局集▲団▼有限公司 | Freezing method and freezing system for connecting passages |
| WO2020244677A1 (en) * | 2019-09-28 | 2020-12-10 | 中铁九局集团有限公司 | Freezing construction method for connecting passage, and freezing system |
| CN110593918A (en) * | 2019-10-15 | 2019-12-20 | 中铁十二局集团有限公司 | Freezing method based tunnel connection channel pump house construction method |
| CN110905561A (en) * | 2019-12-16 | 2020-03-24 | 兰州理工大学 | Weak surrounding rock tunnel freezing initial support structure and construction method |
| CN111173536A (en) * | 2019-12-26 | 2020-05-19 | 中交一航局安装工程有限公司 | Freezing construction method for tunnel connection channel |
| CN111271095B (en) * | 2020-01-20 | 2021-05-14 | 中煤科工集团西安研究院有限公司 | Method for improving grouting effect of mine curtain |
| CN111271095A (en) * | 2020-01-20 | 2020-06-12 | 中煤科工集团西安研究院有限公司 | Method for improving grouting effect of mine curtain |
| CN112112244A (en) * | 2020-08-13 | 2020-12-22 | 中国一冶集团有限公司 | Construction method of drainage channel in limited space |
| CN112112244B (en) * | 2020-08-13 | 2022-05-10 | 中国一冶集团有限公司 | Construction method of drainage channel in limited space |
| CN113494313A (en) * | 2021-06-25 | 2021-10-12 | 中铁一局集团有限公司 | Contact passage portal breaking construction method for main tunnel segment |
| CN115977650A (en) * | 2022-11-22 | 2023-04-18 | 安徽理工大学 | Communication freezing system based on plane skew connection channel and construction method thereof |
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