CN203626848U - Railway shield tunnel end jointly reinforced by horizontal freezing holes and pipe shed - Google Patents
Railway shield tunnel end jointly reinforced by horizontal freezing holes and pipe shed Download PDFInfo
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- CN203626848U CN203626848U CN201320689394.7U CN201320689394U CN203626848U CN 203626848 U CN203626848 U CN 203626848U CN 201320689394 U CN201320689394 U CN 201320689394U CN 203626848 U CN203626848 U CN 203626848U
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Abstract
The utility model provides a railway shield tunnel end jointly reinforced by horizontal freezing holes and a pipe shed. The railway shield tunnel end structurally comprises a freezing curtain, pressure releasing grouting holes, the freezing holes, temperature measuring holes and the pipe shed, wherein the freezing holes and the temperature measuring holes are located in the freezing curtain, the pressure releasing grouting holes and the pipe shed are located above the freezing curtain, the pressure releasing grouting holes are located at the position 1100 mm above freezing holes on the outer circle, and the pipe shed is located at the position 1000 mm above the pressure releasing grouting holes. A method for the railway shield tunnel end includes the steps of firstly, constructing the freezing curtain; secondly, forming the temperature measuring holes; thirdly, forming the pressure releasing grouting holes; fourthly, constructing the pipe shed; fifthly, conducting construction specifically. The railway shield tunnel end has the advantages that the railway shield tunnel end can be suitable for shield launching reinforcing projects which are limited by the field in the city center and can not be implemented through a perpendicular construction method; strength and sealing performance of reinforcing bodies are ensured, frost heaving and thaw collapsing caused by freezing can be controlled, and protection for the sensitive environment is ensured; an existing freezing hole and pipe shed construction machine does not need to be technically improved, construction is convenient, and the environmental friendliness effect is obvious compared with a chemical reinforcing method.
Description
Technical field
The utility model relates to horizontal frozen and the pipe canopy joint reinforcement metro shield turnover termination, hole of when a kind of metro shield starts or arrives, passing through complex environment (responsive building), specifically use horizontal frozen and pipe canopy joint reinforcement metro shield termination, guarantee a kind of minimized method of impact that shield structure starts smoothly or arrives and the scope of starting built-in (structure) is built to thing.Belong to reinforcing technique field, metro shield termination.
Background technology
When Shield Method Tunnel for Metro construction, in order to guarantee that metro shield starts smoothly or arrives and guarantee the safety that influence basin built-in (structure) is built thing, need to reinforce termination conventionally.Its effect is to stop underground water and soil outside termination flow into and make reinforcing body itself have certain strength and stiffness.Conventionally termination reinforces methods such as adopting slip casting method, deep-mixed pile, high-pressure rotary spraying method, freezing process, precipitation method, and every kind of method has pluses and minuses, as table 1.
The contrast of the common metro shield end soil body of table 1 reinforcing mode
Along with the gradual perfection of city underground net; the complex environment that subway work particularly runs at center, city is more and more; often run into because of place and limit and cannot use all kinds of chemical consolidation modes; and adopt freezing process to reinforce due to its frost heave and thaw collapse characteristic, can not meet the situation that the protection of complex environment requires.
The validity of reinforcing in order to ensure termination, starts with from subway engineering construction technology and building protection aspect, develops new shield end reinforcing mode, has important engineering significance and social benefit.
Summary of the invention
The utility model proposes a kind of horizontal frozen and pipe canopy joint reinforcement metro shield turnover termination, hole; its object is intended to meet the situation that the protection of complex environment requires; in hole, utilize horizontal frozen hole consolidation by freezing stratum; make portal abolish freezing soil within the scope of rear hole, form cylinder and add plate, intensity is high, closure is good freezing curtain.The thaw collapse and the frost heave that produce for frozen soil layer in control freezing process affect, on freezing hole top, (slip casting) hole is pressed in a reserved excretion, between freezing period, according to temperature and the building settlement monitoring situation of Water And Earth Pressures growth pattern, thermometer hole in pressure release (slip casting) hole, let out except building base plate below Water And Earth Pressures; Between frost free period, in reserved pressure release (slip casting) hole, top, carry out slip casting, prevent that building from sinking.Meanwhile, grand heavy and reduce to freeze soil body impact on building during freezing and thawing for controlling earth's surface, directly over arrange that a comb canopy makes the variable quantities such as reinforcing area displacement, stress and top building give insulation blocking.
Technical solution of the present invention: a kind of horizontal frozen and pipe canopy joint reinforcement metro shield turnover termination, hole, its structure is to comprise freezing curtain, pressure release injected hole, freezing hole, thermometer hole and pipe boron steel floral tube and pipe boron steel pipe; , wherein freezing hole and thermometer hole are positioned at freezing curtain, and pressure release injected hole and pipe boron steel floral tube and pipe boron steel pipe are positioned at the top of freezing curtain, and pressure release injected hole is positioned at 1100mm place, freezing hole top, outer ring, and pipe canopy is positioned at 1000mm place, pressure release injected hole top.
A method for horizontal frozen and pipe canopy joint reinforcement metro shield turnover termination, hole, comprises the steps:
1) freezing curtain
Freezing hole is pressed level angle and is arranged, freeze 56 of hole counts, arrangement of boring holes is shown in Fig. 1.Cylinder freezing hole is along hole φ 8.0m circular arrangement.Cycle hole perforate spacing is 0.78m, freezes 33 of hole counts, and length is 5m-10m (determining apart from the distance of space enclosing structure according to building).Plate freezing hole is along hole φ 5.4m, φ 2.7m circular arrangement.Wherein perforate spacing in centre circle hole is 1.123m, and freezing hole count is 15; Inner ring hole perforate spacing is 1.171m, and freezing hole count is 7; 1 freezing hole is laid at punch mouthful center, freezing hole length 3.5m-4m, and freezing pipe adopts the 20# seamless steel pipe of Φ 89mm, t=9mm, and freezing hole arrangement parameter is in table 2.
Table 2 freezing hole arrangement parameter table (single hole)
2) thermometer hole
4 thermometer holes are laid in freezing pipe outer ring, and hole depth is consistent with outer ring freezing pipe, at least lays a thermometer hole within the scope of plate freezing zone in every layer of soil, and quantity is no less than 2, and hole depth is consistent with freezing pipe length in region.Point for measuring temperature spacing 1 ~ 1.5m, and frozen soil and space enclosing structure interface two survey point for measuring temperature of each laying, and temperature tube adopts the 20# low-carbon (LC) seamless steel pipe of Φ 89mm, t=9mm.
3) pressure release injected hole
Lay row Φ 89mm 700mm pressure release (slip casting) hole at 1100mm place, freezing hole top, outer ring, arrangement of boring holes is shown in Fig. 1.Hole depth 8m, pressure release hole count is 11.
4) pipe canopy
In order to control, earth's surface is grand to sink and reduces soil body impact on build/structure of top sensitivity during freezing and thawing, and 1000mm place above pressure release injected hole arranges that a row 27 Φ 89mm, t=9mm long pipe sheds carry out insulation blocking, and arrangement of boring holes is shown in Fig. 1.Pipe canopy sweep 11050mm, pipe canopy circumferential distance 300mm, the long 25m of pipe canopy; 1 °, the Guan Peng elevation angle, 12.5 ° of horizontal azimuths, can suitably adjust according to actual conditions, steel pipe and steel floral tube interlaced arrangement, spray of molten steel tube wall arranges injected hole, aperture 10～16mm, pitch of holes 110 ~ 150mm, is quincuncial arrangement, afterbody stays the grouting section 1100mm not holing, inject single liquid cement paste, grouting pressure 0.5MPa, steel pipe is noted single liquid cement paste.
5) construction
(1) arrange freezing hole and thermometer hole, relief hole and Guan Peng, drilling construction operation is: at the bottom of install → boring → measurement of locating holes and orifice tube installation → port seal deflection → blind hole → and pressure test.
Rig should be tight-closed by work plane, firm before installing, and cleans out, and can construct after measuring accurate rig position, and various drilling construction perforate errors must not be greater than 100mm.
Boring maximum deflection must not be greater than 1%, and all boring all should be carried out whole hole deviational survey, and draws hole scattering figure and become hole pattern with each bore position; The outer limb 1 of pipe canopy is spent, and the outer limb allowable variation of boring is 5 ‰.
Freeze casing pack M10 cement mortar, depth of fill is no less than 1500mm.
Tube shed grouting slurries adopt 1:0.8 cement list liquid slurry, and in pipe, Grouting Pipe is discharged mud outward, while waiting the outer mud emptying of pipe to discharge cement paste, close pulp-expelling valve, pump pressure control is not more than 0.5MPa and stops slip casting with interior, controls grouting amount, grouting pressure well, guarantees to manage inside and outside filling quality.
After the slip casting of Guan Peng hole, at thick 10mm steel plate of scuttle hatch, after steel plate, packing ring epoxy resins is filled closely knit and guarantees waterproof effect with offside porthole hole, and steel plate is around fixed by bar planting and side wall.
After freezing pipe installs, should inject clear water pressure testing, test pressure is 0.8MPa, is no more than 0.05MPa through pressure testing 30min pressure drop, then continue 15min pressure do not become qualified.
(2) install and freeze refrigeration system, freeze station equipment and mainly comprise power distribution cabinet, clear water reserviors, freezing unit, salt water circulating pump, cooling water circulating pump, cooling tower, brine tank, connecting line, installation heat-preserving equipment and test instrumentation afterwards, dissolves calcium chloride and also unit is filled to fluorine oiling.
(3) start frozen construction, keep minimum brine temp-28～-30 ℃, until design reinforcement region completes.
Frost wall freezes front reply portal internal groove side wall and is incubated, and insulation can adopt injection blown polyurethane materials, and jet thickness is not less than 30mm, also can adopt foam heat-insulating board insulation, and warming plate thickness is not less than 30mm.
Between freezing period, each measuring point temperature in loop brine temp, temperature tube is gone in reply, earth's surface is grand sinks, builds/and structure sedimentation monitors, and guarantees that each freezing hole is working properly.
Consolidation by freezing completes shutdown standard: actively freezing period, brine temp was-28 ℃～-30 ℃, safeguards that freezing period temperature is-25 ℃ ~-28 ℃, goes that loop brine temp is poor is less than 2 ℃; Frost wall average temperature≤10 ℃; Frost wall thickness reaches design frost wall thickness 3.0/1.6m; Reinforcing body and space enclosing structure intersection measuring point average temperature are less than-5 ℃.
invention beneficial effect
1, be suitable for the shield launching stabilization works that down town cannot be realized by place restriction, vertical construction method.
2, in joint reinforcement, freezing curtain has guaranteed intensity and the sealing of reinforcing body, and pipe canopy can be controlled the frozen swell and melt settlement because freezing to cause, has guaranteed the protective effect to responsive environment.
3, do not need existing freezing hole and pipe roof construction machinery to carry out technological improvement, easy construction, compares other chemical consolidation methods, and environmental benefit is obvious.
Accompanying drawing explanation
Fig. 1 horizontal frozen and pipe canopy joint reinforcement plan view.
Fig. 2 horizontal frozen and pipe canopy joint reinforcement sectional drawing.
In accompanying drawing 1 is freezing hole, the 2nd, thermometer hole, the 3rd, pressure release (slip casting) hole, the 4th, pipe boron steel floral tube, the 5th, pipe boron steel pipe, the 6th, tunnel contour, the 7th, freezing hole deployment line, the 8th, agent structure, the 9th, space enclosing structure, the 10th, freezing curtain.
The specific embodiment
As shown in Figure 1, 2, a kind of horizontal frozen and pipe canopy joint reinforcement metro shield turnover termination, hole, its structure comprises freezing curtain (being reinforced the soil body) 10, pressure release injected hole 3, freezing hole 1, thermometer hole 2 and pipe boron steel floral tube 4 and pipe boron steel pipe 5, wherein freezing hole 1 and thermometer hole 2 are positioned at freezing curtain 10, pressure release injected hole 3, pipe boron steel floral tube 4 and pipe boron steel pipe 5 are positioned at the top of freezing curtain 10, pressure release injected hole 3 is positioned at 1100mm place, freezing hole top, outer ring, and pipe boron steel floral tube 4 and pipe boron steel pipe 5 are positioned at pressure release injected hole 3 1000mm places, top.
Described freezing curtain 10 is positioned at shield launching scope, freezing hole 1 is pressed level angle and is arranged, freeze 56 of hole counts, wherein cylinder freezing hole is along hole φ 8.0m circular arrangement, and outer ring freezing hole perforate spacing is 0.78m, freezes 33 of hole counts, length is 6.9m, plate freezing hole is along hole φ 5.4m, φ 2.7m circular arrangement, and perforate spacing in centre circle hole is 1.123m, and freezing hole count is 15; Inner ring hole perforate spacing is 1.171m, and freezing hole count is 7; 1 freezing hole is laid, freezing hole length 3.8m, the 20# seamless steel pipe of Φ 89mm, t=9mm for freezing pipe in punch mouthful center.
Described thermometer hole is positioned at freezing curtain, 4 thermometer holes are laid in freezing pipe outer ring, thermometric hole depth is consistent with outer ring freezing pipe, within the scope of plate freezing zone, in every layer of soil, at least lay a thermometer hole, and quantity is no less than 2, thermometer hole hole depth is consistent with freezing pipe length within the scope of plate freezing zone, point for measuring temperature spacing 1 ~ 1.5m, and point for measuring temperature of each laying is surveyed at frozen soil and space enclosing structure interface two, temperature tube adopts the 20# low-carbon (LC) seamless steel pipe of Φ 89mm, t=9mm.
Described 1100mm place, freezing hole top, outer ring lays a row Φ 89mm 700mm pressure release injected hole, hole depth 8m, and pressure release hole count is 11.
Described 1000mm place, pressure release injected hole top, arranges that a row 27 Φ 89mm, t=9mm long pipe sheds carry out insulation blocking, pipe canopy sweep 11050mm, pipe canopy circumferential distance 300mm, the long 25m of pipe canopy; 1 °, the Guan Peng elevation angle, 12.5 ° of horizontal azimuths, steel pipe and steel floral tube interlaced arrangement, spray of molten steel tube wall arranges pressure release injected hole, aperture 10～16mm, pitch of holes 110 ~ 150mm, is quincuncial arrangement, afterbody stays the grouting section 1100mm not holing, grouting pressure 0.5MPa, and steel pipe is noted single liquid cement paste.
A method for horizontal frozen and pipe canopy joint reinforcement metro shield turnover termination, hole, comprises the steps:
1) freezing curtain
Freezing hole is pressed level angle and is arranged, freeze 56 of hole counts, arrangement of boring holes is shown in Fig. 1.Cylinder freezing hole is along hole φ 8.0m circular arrangement.Cycle hole perforate spacing is 0.78m, freezes 33 of hole counts, and length is 5m-10m (determining apart from the distance of space enclosing structure according to building).Plate freezing hole is along hole φ 5.4m, φ 2.7m circular arrangement.Wherein perforate spacing in centre circle hole is 1.123m, and freezing hole count is 15; Inner ring hole perforate spacing is 1.171m, and freezing hole count is 7; 1 freezing hole is laid at punch mouthful center, freezing hole length 3.5m-4m, and freezing pipe adopts the 20# seamless steel pipe of Φ 89mm, t=9mm, and freezing hole arrangement parameter is in table 2.
Table 2 freezing hole arrangement parameter table (single hole)
2) thermometer hole
4 thermometer holes are laid in freezing pipe outer ring, and hole depth is consistent with outer ring freezing pipe, at least lays a thermometer hole within the scope of plate freezing zone in every layer of soil, and quantity is no less than 2, and hole depth is consistent with freezing pipe length in region.Point for measuring temperature spacing 1 ~ 1.5m, and frozen soil and space enclosing structure interface two survey point for measuring temperature of each laying, and temperature tube adopts the 20# low-carbon (LC) seamless steel pipe of Φ 89mm, t=9mm.
3) pressure release injected hole
Lay row Φ 89mm 700mm pressure release (slip casting) hole at 1100mm place, freezing hole top, outer ring, arrangement of boring holes is shown in Fig. 1.Hole depth 8m, pressure release hole count is 11.
4) pipe canopy (pipe boron steel floral tube 4, pipe boron steel pipe 5)
In order to control, earth's surface is grand to sink and reduces soil body impact on build/structure of top sensitivity during freezing and thawing, and 1000mm place above pressure release injected hole arranges that a row 27 Φ 89mm, t=9mm long pipe sheds carry out insulation blocking, and arrangement of boring holes is shown in Fig. 1.Pipe canopy sweep 11050mm, pipe canopy circumferential distance 300mm, the long 25m of pipe canopy; 1 °, the Guan Peng elevation angle, 12.5 ° of horizontal azimuths, can suitably adjust according to actual conditions, pipe boron steel floral tube 4 and pipe boron steel pipe 5 interlaced arrangement, pipe boron steel floral tube wall arranges injected hole, aperture 10～16mm, pitch of holes 110 ~ 150mm, is quincuncial arrangement, afterbody stays the grouting section 1100mm not holing, inject single liquid cement paste, grouting pressure 0.5MPa, steel pipe is noted single liquid cement paste.
5) construction
(1) arrange freezing hole and thermometer hole, relief hole and Guan Peng, drilling construction operation is: at the bottom of install → boring → measurement of locating holes and orifice tube installation → port seal deflection → blind hole → and pressure test.
Rig should be tight-closed by work plane, firm before installing, and cleans out, and can construct after measuring accurate rig position, and various drilling construction perforate errors must not be greater than 100mm.
Boring maximum deflection must not be greater than 1%, and all boring all should be carried out whole hole deviational survey, and draws hole scattering figure and become hole pattern with each bore position; The outer limb 1 of pipe canopy is spent, and the outer limb allowable variation of boring is 5 ‰.
Freeze casing pack M10 cement mortar, depth of fill is no less than 1500mm.
Tube shed grouting slurries adopt 1:0.8 cement list liquid slurry, and in pipe, Grouting Pipe is discharged mud outward, while waiting the outer mud emptying of pipe to discharge cement paste, close pulp-expelling valve, pump pressure control is not more than 0.5MPa and stops slip casting with interior, controls grouting amount, grouting pressure well, guarantees to manage inside and outside filling quality.
After the slip casting of Guan Peng hole, at thick 10mm steel plate of scuttle hatch, after steel plate, packing ring epoxy resins is filled closely knit and guarantees waterproof effect with offside porthole hole, and steel plate is around fixed by bar planting and side wall.
After freezing pipe installs, should inject clear water pressure testing, test pressure is 0.8MPa, is no more than 0.05MPa through pressure testing 30min pressure drop, then continue 15min pressure do not become qualified.
(2) install and freeze refrigeration system, freeze station equipment and mainly comprise power distribution cabinet, clear water reserviors, freezing unit, salt water circulating pump, cooling water circulating pump, cooling tower, brine tank, connecting line, installation heat-preserving equipment and test instrumentation afterwards, dissolves calcium chloride and also unit is filled to fluorine oiling.
(3) start frozen construction, keep minimum brine temp-28～-30 ℃, until design reinforcement region completes.
Frost wall freezes front reply portal internal groove side wall and is incubated, and insulation can adopt injection blown polyurethane materials, and jet thickness is not less than 30mm, also can adopt foam heat-insulating board insulation, and warming plate thickness is not less than 30mm.
Between freezing period, each measuring point temperature in loop brine temp, temperature tube is gone in reply, earth's surface is grand sinks, builds/and structure sedimentation monitors, and guarantees that each freezing hole is working properly.
Consolidation by freezing completes shutdown standard: actively freezing period, brine temp was-28 ℃～-30 ℃, safeguards that freezing period temperature is-25 ℃ ~-28 ℃, goes that loop brine temp is poor is less than 2 ℃; Frost wall average temperature≤10 ℃; Frost wall thickness reaches design frost wall thickness 3.0/1.6m; Reinforcing body and space enclosing structure intersection measuring point average temperature are less than-5 ℃.
Embodiment
Subway Line 1 triumph door shield structure interval, station, station～San Yang square, Wuxi is mainly walked in old town, center, go out that new refined all hotels are worn in triumph under Men Zhanhou, Zhongshan North Road transformation No. 5 room, side are worn No. 4 room of Zhongshan North Road and turned to Zhongshan Road, keeping straight on to enter southwards along one road, Zhongshan Road is afterwards positioned at station, San Yang square, urban district.The left line 500.37m of siding-to-siding block length, right line 510.939m.The right line of shield structure turnover hole reinforcing area top, the south, triumph door station present situation is (3～8 layers on the ground, market, oasis, underground 1 layer, independent foundation under column, frame construction, base for post and basement bottom board are built simultaneously, at the bottom of architecture basics with the straight discrepancy in elevation 3.706m of tunnel structure roof pendant), left line top present situation for new refined all hotels (be built in 1993, on the ground " 4+1+1 " 6 totally layers point add a cover for three times, without at the bottom of basement, independent foundation under column, architecture basics and the about 4.21m of the straight discrepancy in elevation of tunnel structure roof pendant).
1. according to field condition and horizontal frozen construction experience, adopt technical scheme as follows:
1) freezing curtain
Freezing hole is pressed level angle and is arranged, freeze 56 of hole counts, arrangement of boring holes is shown in Fig. 1.Cylinder freezing hole is along hole φ 8.0m circular arrangement.Cycle hole perforate spacing is 0.78m, freezes 33 of hole counts, and length is 6.9m (determining apart from the distance of space enclosing structure according to building).Plate freezing hole is along hole φ 5.4m, φ 2.7m circular arrangement.Wherein perforate spacing in centre circle hole is 1.123m, and freezing hole count is 15; Inner ring hole perforate spacing is 1.171m, and freezing hole count is 7; 1 freezing hole, freezing hole length 3.8m are laid in punch mouthful center.Freezing pipe adopts the 20# seamless steel pipe of Φ 89mm, t=9mm.Freezing hole arrangement parameter is in table 3.
The left line in triumph door station, the table 3 Wuxi freezing hole arrangement parameter table (single hole) that starts
2) thermometer hole
4 thermometer holes are laid in freezing pipe outer ring, and hole depth is consistent with outer ring freezing pipe, at least lays a thermometer hole within the scope of plate freezing zone in every layer of soil, and quantity is no less than 2, and hole depth is consistent with freezing pipe length in region.Point for measuring temperature spacing 1 ~ 1.5m, and frozen soil and space enclosing structure interface two survey point for measuring temperature of each laying, and temperature tube adopts the 20# low-carbon (LC) seamless steel pipe of Φ 89mm, t=9mm.
3) pressure release injected hole
Lay row Φ 89mm 700mm pressure release (slip casting) hole at 1100mm place, freezing hole top, outer ring, arrangement of boring holes is shown in Fig. 1.Hole depth 8m, pressure release hole count is 11.
4) pipe canopy
In order to control, earth's surface is grand to sink and reduces soil body impact on build/structure of top sensitivity during freezing and thawing, and 1000mm place above pressure release injected hole arranges that a row 27 Φ 89mm, t=9mm long pipe sheds carry out insulation blocking, and arrangement of boring holes is shown in Fig. 1.Pipe canopy sweep 11050mm, pipe canopy circumferential distance 300mm, the long 25m of pipe canopy; 1 °, the Guan Peng elevation angle, 12.5 ° of horizontal azimuths, can suitably adjust according to actual conditions, steel pipe and steel floral tube interlaced arrangement, spray of molten steel tube wall arranges injected hole, aperture 10～16mm, pitch of holes 110 ~ 150mm, is quincuncial arrangement, afterbody stays the grouting section 1100mm not holing, inject single liquid cement paste, grouting pressure 0.5MPa, steel pipe is noted single liquid cement paste.
5) construction
(1) arrange freezing hole and thermometer hole, relief hole and Guan Peng, drilling construction operation is: at the bottom of install → boring → measurement of locating holes and orifice tube installation → port seal deflection → blind hole → and pressure test.
Rig should be tight-closed by work plane, firm before installing, and cleans out, and can construct after measuring accurate rig position, and various drilling construction perforate errors must not be greater than 100mm.
Boring maximum deflection must not be greater than 1%, and all boring all should be carried out whole hole deviational survey, and draws hole scattering figure and become hole pattern with each bore position; The outer limb 1 of pipe canopy is spent, and the outer limb allowable variation of boring is 5 ‰.
Freeze casing pack M10 cement mortar, depth of fill is no less than 1500mm.
Tube shed grouting slurries adopt 1:0.8 cement list liquid slurry, and in pipe, Grouting Pipe is discharged mud outward, while waiting the outer mud emptying of pipe to discharge cement paste, close pulp-expelling valve, pump pressure control is not more than 0.5MPa and stops slip casting with interior, controls grouting amount, grouting pressure well, guarantees to manage inside and outside filling quality.
After the slip casting of Guan Peng hole, at thick 10mm steel plate of scuttle hatch, after steel plate, packing ring epoxy resins is filled closely knit and guarantees waterproof effect with offside porthole hole, and steel plate is around fixed by bar planting and side wall.
After freezing pipe installs, should inject clear water pressure testing, test pressure is 0.8MPa, is no more than 0.05MPa through pressure testing 30min pressure drop, then continue 15min pressure do not become qualified.
(2) install and freeze refrigeration system, freeze station equipment and mainly comprise power distribution cabinet, clear water reserviors, freezing unit, salt water circulating pump, cooling water circulating pump, cooling tower, brine tank, connecting line, installation heat-preserving equipment and test instrumentation afterwards, dissolves calcium chloride and also unit is filled to fluorine oiling.
(3) start frozen construction, keep minimum brine temp-28～-30 ℃, until design reinforcement region completes.
Frost wall freezes front reply portal internal groove side wall and is incubated, and insulation can adopt injection blown polyurethane materials, and jet thickness is not less than 30mm, also can adopt foam heat-insulating board insulation, and warming plate thickness is not less than 30mm.
Between freezing period, each measuring point temperature in loop brine temp, temperature tube is gone in reply, earth's surface is grand sinks, builds/and structure sedimentation monitors, and guarantees that each freezing hole is working properly.
Consolidation by freezing completes shutdown standard: actively freezing period, brine temp was-28 ℃～-30 ℃, safeguards that freezing period temperature is-25 ℃ ~-28 ℃, goes that loop brine temp is poor is less than 2 ℃; Frost wall average temperature≤10 ℃; Frost wall thickness reaches design frost wall thickness 3.0/1.6m; Reinforcing body and space enclosing structure intersection measuring point average temperature are less than-5 ℃.
In the left line shield launching engineering of subway Line 1 triumph door station, station～San Yang square, Wuxi; horizontal frozen outer ring safeguards that frost wall thickness reaches 2.8m; frozen soil wall design average temperature-11.7 ℃; the maximum uplift capacity in earth's surface is 7mm; maximum settlement amount is 5mm; the maximum protuberance of upper building 4mm, maximum settlement amount 1mm, reinforces obvious to environmental protection effect.
Claims (5)
1. horizontal frozen and a pipe canopy joint reinforcement metro shield turnover termination, hole, is characterized in that comprising freezing curtain, pressure release injected hole, freezing hole, thermometer hole and pipe boron steel floral tube and pipe boron steel pipe; Wherein freezing hole and thermometer hole are positioned at freezing curtain, and pressure release injected hole, pipe boron steel floral tube and pipe boron steel pipe are positioned at the top of freezing curtain, and pressure release injected hole is positioned at 1100mm place, freezing hole top, outer ring, and pipe canopy is positioned at 1000mm place, pressure release injected hole top.
2. a kind of horizontal frozen according to claim 1 and pipe canopy joint reinforcement metro shield turnover termination, hole, it is characterized in that described freezing curtain is positioned at shield launching scope, freezing hole is pressed level angle and is arranged, freeze 56 of hole counts, wherein cylinder freezing hole is along hole φ 8.0m circular arrangement, outer ring freezing hole perforate spacing is 0.78m, freeze 33 of hole counts, length is 6.9m, plate freezing hole is along hole φ 5.4m, φ 2.7m circular arrangement, perforate spacing in centre circle hole is 1.123m, and freezing hole count is 15; Inner ring hole perforate spacing is 1.171m, and freezing hole count is 7; 1 freezing hole is laid, freezing hole length 3.8m, the 20# seamless steel pipe of Φ 89mm, t=9mm for freezing pipe in punch mouthful center.
3. a kind of horizontal frozen according to claim 1 and pipe canopy joint reinforcement metro shield turnover termination, hole, it is characterized in that described thermometer hole is positioned at freezing curtain, 4 thermometer holes are laid in freezing pipe outer ring, thermometric hole depth is consistent with outer ring freezing pipe, within the scope of plate freezing zone, in every layer of soil, at least lay a thermometer hole, and quantity is no less than 2, thermometer hole hole depth is consistent with freezing pipe length within the scope of plate freezing zone, point for measuring temperature spacing 1 ~ 1.5m, and point for measuring temperature of each laying is surveyed at frozen soil and space enclosing structure interface two, temperature tube adopts Φ 89mm, the 20# low-carbon (LC) seamless steel pipe of t=9mm.
4. a kind of horizontal frozen according to claim 1 and pipe canopy joint reinforcement metro shield turnover termination, hole, is characterized in that described 1100mm place, freezing hole top, outer ring lays a row Φ 89mm 700mm pressure release injected hole, hole depth 8m, and pressure release hole count is 11.
5. a kind of horizontal frozen according to claim 1 and pipe canopy joint reinforcement metro shield turnover termination, hole, it is characterized in that described 1000mm place, pressure release injected hole top, arrange that a row 27 Φ 89mm, t=9mm long pipe sheds carry out insulation blocking, pipe canopy sweep 11050mm, pipe canopy circumferential distance 300mm, the long 25m of pipe canopy; 1 °, the Guan Peng elevation angle, 12.5 ° of horizontal azimuths, pipe boron steel floral tube and pipe boron steel pipe interlaced arrangement, pipe boron steel floral tube wall arranges pressure release injected hole, aperture 10～16mm, pitch of holes 110 ~ 150mm, be quincuncial arrangement, afterbody stays the grouting section 1100mm not holing, grouting pressure 0.5MPa, and pipe boron steel pipe is noted single liquid cement paste.
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| CN201320689394.7U CN203626848U (en) | 2013-11-04 | 2013-11-04 | Railway shield tunnel end jointly reinforced by horizontal freezing holes and pipe shed |
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| CN201320689394.7U CN203626848U (en) | 2013-11-04 | 2013-11-04 | Railway shield tunnel end jointly reinforced by horizontal freezing holes and pipe shed |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527214A (en) * | 2013-11-04 | 2014-01-22 | 南京林业大学 | Horizontal freezing and pipe shed combined subway shield tunnel reinforcing tip and method |
| CN104832196A (en) * | 2015-03-31 | 2015-08-12 | 中铁时代建筑设计院有限公司 | Pipe roof freezing method supporting structure and construction method thereof |
| CN105952458A (en) * | 2016-03-29 | 2016-09-21 | 中铁时代建筑设计院有限公司 | Shield tunnel end semispherical freezing wall reinforcement structure and construction method thereof |
| CN107402077A (en) * | 2017-09-08 | 2017-11-28 | 湖北科技学院 | A kind of tunnel freeze thawing circle device for detecting temperature |
| CN112682073A (en) * | 2020-12-31 | 2021-04-20 | 中铁二十五局集团第五工程有限公司 | Water retaining wall structure for blocking tunnel portal in shield well and construction method thereof |
| CN114351528A (en) * | 2021-12-01 | 2022-04-15 | 北京中煤矿山工程有限公司 | High-pressure slurry jet hole cutting and frost heaving reduction construction method |
-
2013
- 2013-11-04 CN CN201320689394.7U patent/CN203626848U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103527214A (en) * | 2013-11-04 | 2014-01-22 | 南京林业大学 | Horizontal freezing and pipe shed combined subway shield tunnel reinforcing tip and method |
| CN103527214B (en) * | 2013-11-04 | 2015-11-11 | 南京林业大学 | A kind of horizontal frozen and pipe canopy joint reinforcement metro shield export & import termination and method |
| CN104832196A (en) * | 2015-03-31 | 2015-08-12 | 中铁时代建筑设计院有限公司 | Pipe roof freezing method supporting structure and construction method thereof |
| CN105952458A (en) * | 2016-03-29 | 2016-09-21 | 中铁时代建筑设计院有限公司 | Shield tunnel end semispherical freezing wall reinforcement structure and construction method thereof |
| CN107402077A (en) * | 2017-09-08 | 2017-11-28 | 湖北科技学院 | A kind of tunnel freeze thawing circle device for detecting temperature |
| CN107402077B (en) * | 2017-09-08 | 2023-10-27 | 湖北科技学院 | Tunnel freeze thawing circle temperature monitoring device |
| CN112682073A (en) * | 2020-12-31 | 2021-04-20 | 中铁二十五局集团第五工程有限公司 | Water retaining wall structure for blocking tunnel portal in shield well and construction method thereof |
| CN114351528A (en) * | 2021-12-01 | 2022-04-15 | 北京中煤矿山工程有限公司 | High-pressure slurry jet hole cutting and frost heaving reduction construction method |
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