CN102720508B - Shield construction method for continuously under-passing dense buildings in silty-soil and silty-sand formation - Google Patents
Shield construction method for continuously under-passing dense buildings in silty-soil and silty-sand formation Download PDFInfo
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Abstract
The invention discloses a shield construction method which uses a shield machine to continuously under-pass dense buildings in a silty-soil and silty-sand formation. The method comprises the following steps: (1) soil improvement, (2) shield tunnel, (3) segment assembly, and (4) synchronized grout injection. The method in the invention overcomes the problem that the prior shield construction methods can not satisfy requirements for ground settlement in shield constructions of water-rich silty-soil and silty-sand formations. Through the soil improvement, the shield in the construction process can maintain tunneling with stable tunneling speeds and cutterhead torques. With construction parameters strictly controlled, single ground settlement can be controlled within 3mm while accumulative ground settlement and building settlement can be controlled within 10mm. Thus, roads over the tunnel can be ensured to be unblocked, and buildings to be safe and normally used. The shield in the construction process can maintain tunneling with stable tunnel speeds and cutterhead torques, thereby increasing working efficiency and reducing construction cost.
Description
Technical field
The present invention relates to a kind of shield construction method, particularly a kind of silt sandy silt soil stratum shield machine continuously under wear the construction method of intensive building.
Background technology
" shield construction " is a kind of set of tunneling construction method that mechanization and automaticity are higher, and from the sixties in 20th century, this technology is applied to city underground and the construction of large size city outlet tunnel by western developed country in a large number.Along with developing rapidly of field of urban rail, metro shield working skill is used widely.Shield construction take shield machine as tunneling equipment, does supporting with the shield shell of shield machine, with the front end knife cutting soil body, advanced, do lining cutting with prefabricated section of jurisdiction assembled in excavation face by jack pushing tow shield machine, thus form the construction method in tunnel.Shield Method Tunnel for Metro is used for municipal construction, because the excavation driving of shield machine causes loosening and depression of surrounding soil more greatly to tunnel surrounding soil disturbance, namely causes the sedimentation on earth's surface; There is structure void between excavation face and lining segment and also have certain influence to surrounding soil, therefore, certain sedimentation can be there is in shield-tunneling construction earth's surface along the line, affect by it, building around tunnel will deform, sedimentation or displacement etc., if do not take measures, ground settlement is controlled, once occur to show sedimentation significantly, serious consequence may be produced.
In shield machine tunneling process, construction parameter (as support pressure, shield driving speed, shield structure unearthed amount, simultaneous grouting slurry match ratio etc.) is larger on the impact of ground settlement.In existing shield-tunneling construction, by strictly controlling construction parameter, earth's surface cumulative settling can be controlled at-30mm ~+10mm.Such sedimentation degree, for general area, can meet construction requirement.But in Surface Buildings thickly district, then need cumulative settling to control, within ± 10mm, just effectively to avoid the impact on surface buildings caused because ground settlement is excessive.Existing shield construction method still can not reach this requirement.Further, be rich pigment soil flour sand area in construction environment, slightly control accidentally, namely the dangerous situations such as earth's surface house crack may occur because ground settlement is excessive.Therefore, need more strictly to control ground settlement.But in rich pigment soil flour sand area, because this environment has high osmosis, poor stability, shield-tunneling construction is comparatively large on its impact, and the ground settlement controlling this area exists larger difficulty.
Summary of the invention
The object of the invention is to overcome existing shield construction method cumulative settling larger, the deficiency within ± 10mm can not be controlled, wear intensive building shield construction method under providing a kind of silt powder stratum continuously, earth's surface cumulative settling can control within ± 10mm by the method.
In order to realize foregoing invention object, the invention provides following technical scheme:
Wear intensive building shield-tunneling construction construction method under silt sandy silt soil stratum shield machine is continuous, comprise the following steps:
(1) soil improvement:
Use shield-tunneling construction soil improvement foaming agent to soil improvement before shield driving, described soil improvement foaming agent mixes obtained with water by HHZ-01 foaming agent stoste, and in soil improvement foaming agent, the volume ratio of foam dope and water is 3%: 97%;
(2) shield driving:
Carry out shield driving after soil improvement, the parameter of shield driving is: shield machine thrust is 1500 ~ 1900T, and cutter head torque is 1.5 ~ 2.2MNm; Support pressure is 1.8 ~ 2.2bar, fluctuates as ± 0.2bar;
(3) pipe sheet assembling:
When shield machine thrust oil cylinder overhang reaches 1.2m, close conveying worm gate, shield machine stops advancing after continuing to push ahead 2 ~ 3cm, carries out pipe sheet assembling work; After every ring pipe sheet assembling completes, carry out next ring shield driving;
(4) synchronous grouting:
When shield structure pushes ahead the formation of shield tail space, carry out synchronous grouting by the built-in Grouting Pipe of synchronous grouting system and shield tail, the grouting pressure of synchronous grouting is 4 ~ 5.5bar, and synchronous grouting amount is 250% ~ 300%.
In above-mentioned shield construction method, by using HHZ-01 foaming agent to improve the soil body, make the soil body more soft, there is better workability, experimental data shows, under aforementioned proportion and consumption, to the disturbance of the soil body when contributing to alleviating shield driving, thus contribute to controlling ground settlement; On the other hand, soil improvement makes the soil body pliability of whole construction line consistent, contributes to keeping stable fltting speed and cutter head torque to advance in shield driving; Above-mentioned construction method is optimized construction parameter, under the condition of above-mentioned construction method, effectively can control earth's surface cumulative settling within ± 10mm.
In order to improve the soil body further, preferably, in above-mentioned shield construction method, in step (1), the consumption of soil improvement foaming agent is 0.21 ‰ of the amount of being unearthed.
In order to make shield driving stablize propelling, preferably, in above-mentioned shield construction method, in step (2), driving speed is 2.5 ~ 3cm/min.
In order to control ground settlement further, keep excavated volume be unearthed measure balanced, in above-mentioned shield construction method, in shield tunneling process control excavate soil layer be lost within 5 ‰.
In order to control ground settlement further, prevent line clogging, preferably, in above-mentioned shield construction method, in step (4), the match ratio of the slurries that synchronous grouting adopts is: in every cubic metre of slurries, each material usage is: fineness modulus is the fine sand 750 ~ 930kg of 1.6 ~ 2.2, gray scale is the flyash 390 ~ 455kg of II level, sodium bentonite 40 ~ 65kg, water 550 ~ 650kg.The proportioning of above-mentioned slurries is more preferably: in every cubic metre of slurries, each material usage is: modulus is the fine sand 820 ~ 900kg of 1.6 ~ 2.2, II level flyash 400 ~ 450kg, sodium bentonite 40 ~ 60kg, water 550 ~ 600kg.
In order to control ground settlement further, preferably, carry out the monitoring of ground settlement when shield driving, monitoring frequency is: the front 10m of cutterhead to rear 20m, and monitoring in every 4 hours once; Otch front 20 ring, to rear 30 ring scope, monitors 3 every day; After pressure surface in 30 ring to 100 rings, monitor 1 time weekly; 100 ring to 200 ring sections after pressure surface, monthly monitor 1 time;
When every day ground settlement or accumulative ground settlement exceed 70 ~ 80% of controlling value time, carry out secondary grouting, first adopt during secondary grouting single liquid starch carry out interstitial diffusion, then adopt dual slurry fill, until surface settlement control is within the scope of controlling value.
Preferably, in above-mentioned shield construction method, single slurries that described secondary grouting adopts consist of cement, water: the weight proportion of single slurries is: cement: water is 1: 0.8; Two slurries consist of cement, water glass, water, the weight proportion of two slurries is: cement: water glass: water is 1: 0.06: 0.8.
In above-mentioned shield construction method, every day, surface settlement control was in ± 3mm, and accumulative surface settlement control is in+3 ~ ± 10mm.
When tunneling to prevent shield machine, underground water and simultaneous grouting slurry scurry into tunnel from shield tail; protect shield ventral brush simultaneously; reach the sealing function of shield structure, also comprise filling shield tail grease step in above-mentioned shield construction method: when shield driving, the uniform shield tail grease of brush is brushed to shield tail steel plate.
Compared with prior art, beneficial effect of the present invention:
1, shield construction method of the present invention, use foam solution the soil body is improved, make the soil body more soft, there is better workability, the disturbance of shield structure to the soil body can be alleviated during driving, so reduce ground settlement; On the other hand, soil improvement makes the soil body pliability of whole construction line consistent, and then makes shield structure that stable fltting speed and cutter head torque can be kept to advance, and improves operating efficiency, reduces construction cost.
2, shield construction method of the present invention is adopted, within the single sedimentation of building can be controlled in 3mm, in the settlement monitoring point of earth's surface and building, the monitoring point settlement Control of 97.3%, within 10mm, ensure that the safety of unimpeded, the building of tunnel upper road and normally uses.
Detailed description of the invention
Below in conjunction with test example and detailed description of the invention, the present invention is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment, all technology realized based on content of the present invention all belong to scope of the present invention.
Embodiment
For certain silt sandy silt soil stratum shield-tunneling construction, this project two-wire total length 2238.442m, amounts to section of jurisdiction 1866 ring, wherein left line length 1116.447m (931 ring), right line length 1121.995m (935 ring).Two-wire total length 2238.442m, amounts to section of jurisdiction 1866 ring, wherein left line length 1116.447m (931 ring), right line length 1121.995m (935 ring).Interval plane least radius 450m, longitudinal minimum grade is 2 ‰, and maximum gradient is 25.567 ‰.Center, tunnel the minimum depth is 12.635m, and maximum buried depth is 20.35m.Left line is advanced into 21 rings, right line 22 ring tunnel starts to wear intensive house continuously, to left line advance 695 rings, right line 701 ring completes passing through of residential block, wear raw water tubes under starting, paste Shahe; Paste passing through of Shahe start undercrossing tunnel trestle when left tunnel line advances to complete when 715 rings, right line 721 ring.After having worn the construction of Railway Trestle Bridge under shield machine, just arrive with station, station, city after undercrossing tunnel station track, discarded stake, walkway, overhead waiting hall and Zhejiang Railway Hotel successively and receive.The mainly silt sandy silt soil stratum that interval is passed through is: 3 layers of sandy silt, 5 layers of sandy silt folder flour sand, 7 layers of sandy silt, 8 layers of sandy silt folder flour sand, 1 layer of very soft sill clay, 1 farinose argillic horizon, 2 layers of silty clay.Interval silt, silty sand ground are all in saturation state, permeability slightly well, belong to aquitard, for main phreatic aquifer, its mechanical property has obvious thixotropy and mobility, under hydrodynamic condition effect, easily produces piping, quicksand and thixotropy phenomenon, thus reduce soil layer construction intensity, affect construction safety.
This silt powder stratum shield construction method comprises the following steps:
(1) soil improvement:
Use shield-tunneling construction soil improvement foaming agent to soil improvement before shield driving, described soil improvement foaming agent mixes obtained with water by domestic clear and bright HHZ-01 foaming agent stoste, in soil improvement foaming agent, the volume ratio of foam dope and water is 3%: 97%, the consumption of foaming agent is: often tunnel a ring and need foam dope 1.1L, water 35.6L;
(2) shield driving:
Carry out shield driving after soil improvement, the parameter of shield driving is: shield machine thrust is 1500 ~ 1900T, and cutter head torque is 1.5 ~ 2.2MNm; Support pressure is 1.8 ~ 2.2bar, fluctuates as ± 0.2bar; Driving speed is 2.5 ~ 3cm/min; The loss of excavation soil layer will control within 5 ‰, strict controls the amount of being unearthed, accomplish excavated volume with unearthed measure balanced.This tunnel excavation diameter 6.2m, consider the soil layer loss that shield attitude change or other reasons cause and the soil layer coefficient of volumetric expansion, every ring 1.2m is unearthed and measures about 38.4m
3.
(3) pipe sheet assembling:
When shield machine thrust oil cylinder overhang reaches 1.2m, close conveying worm gate, shield machine stops advancing after continuing to push ahead 2 ~ 3cm, carries out pipe sheet assembling work; After every ring pipe sheet assembling completes, carry out next ring shield driving;
(4) synchronous grouting:
When shield structure pushes ahead the formation of shield tail space, synchronous grouting is carried out by the built-in Grouting Pipe of synchronous grouting system and shield tail, the grouting pressure of synchronous grouting is 4 ~ 5.5bar, synchronous grouting amount is 6.8-7.5 side, the match ratio of the slurries that synchronous grouting adopts is: in every cubic metre of slurries, each material usage is: modulus be 1.6 ~ 2.2 fine sand be about 900kg, II level flyash is about 450kg, sodium bentonite 40 ~ 60kg, water 550 ~ 600kg, slurry consistency is 120mm.Simultaneous grouting slurry obtains by the following method: (1) adds sodium bentonite and water in slurry mixing tank, and the consumption of water is 1/3 of sodium bentonite consumption, mixing 30min; (2) drop in slurry mixing tank fineness modulus be 1.6 ~ 2.2 fine sand, ash for gray scale be that the flyash of II level and water carry out mixing, mixing 20min.
In above-mentioned shield construction method, by using HHZ-01 foaming agent, the soil body is improved, make the soil body more soft, there is better workability, experimental data shows, adopts the foaming agent of said method preparation gained, can reach 15 times in the pressure lower frothing multiplying power of 0.03MPa, maximum injection rate in sandy soil layer can reach 50%, under aforementioned proportion and consumption, to the disturbance of the soil body when contributing to alleviating shield driving, thus contribute to controlling ground settlement; On the other hand, soil improvement makes the soil body pliability of whole construction line consistent, contributes to keeping stable fltting speed and cutter head torque to advance in shield driving; Above-mentioned construction method is optimized construction parameter, under the condition of above-mentioned construction method, effectively can control earth's surface cumulative settling within ± 10mm.
Carry out the monitoring of ground settlement when shield driving, monitoring frequency is: the front 10m of cutterhead to rear 20m, and monitoring in every 4 hours once; Otch front 20 ring, to rear 30 ring scope, monitors 3 every day; After pressure surface in 30 ring to 100 rings, monitor 1 time weekly; 100 ring to 200 ring sections after pressure surface, monthly monitor 1 time;
When every day ground settlement exceed ± 2mm or accumulative ground settlement more than 7mm time, carry out secondary grouting, first use single liquid to starch and carry out interstitial diffusion, then adopt dual slurry to fill, until surface settlement control is within the scope of controlling value.Described single slurries consist of cement, water: the weight proportion of single slurries is: cement: water is 1: 0.8; Two slurries consist of cement, water glass, water, the weight proportion of two slurries is: cement: water glass: water is 1: 0.06: 0.8.
When tunneling to prevent shield machine, underground water and simultaneous grouting slurry scurry into tunnel from shield tail; protect shield ventral brush simultaneously; reach the sealing function of shield structure; filling shield tail grease step is also comprised: when shield driving in above-mentioned shield construction method; the uniform shield tail grease of brush is brushed to shield tail steel plate, every ring filling shield tail grease amount 35 ~ 45kg.
Adopt the simultaneous grouting slurry of above-mentioned cooperation when preparation method's preparation, there is good workability and pumpability, the disturbance of construction to the soil body can be alleviated, decrease slurries segregation, blocking Grouting Pipe phenomenon simultaneously, accelerate construction speed.
By adopting above-mentioned silt sandy silt soil stratum shield construction method, this project overcomes existing shield construction method can not meet rich pigment soil sandy silt soil stratum shield-tunneling construction to the requirement of ground settlement, make the single settlement Control of building within 3mm, in the settlement monitoring point of earth's surface and building, the monitoring point settlement Control of 97.3% is within 10mm, ensure that the safety of unimpeded, the building of tunnel upper road and normally use, the life of resident is not had any impact, maintain the favorable image in city, environmental benefit is good.
The Selection experiment of test example soil improvement foaming agent
Soil improvement test is carried out at the test section in location similar to embodiment, soil improvement foaming agent is selected, be beneficial to effectively control ground settlement, use respectively in process of the test import Condar special and domestic clear and bright respectively according to 3%, 5% proportioning and do not use foaming agent to carry out field trial, its shield driving parameter is respectively as shown shown in 1-table 4.
Table 1 sandy silt soil stratum does not add the boring parameter of foam
Table 1 result shows, when using foaming agent to improve the soil body, the situation of the excessive autostop of cutter head torque is repeatedly there is in tunneling process, and shield driving is slow, only 2mm/min can be maintained, mechanical load strengthens, temperatures as high more than 50 ° in tunnel, and the material consumptions such as shield tail grease, cutterhead grease are huge; Furthermore do not have drilling depth shield structure to be unearthed and show as water and soil released state, had a strong impact on the civilized construction in tunnel.Advance because shield structure is positioned at rich pigment soil sandy silt soil stratum, earth's surface is again the situation that intensive old house does not possess the inspection of personnel's warehouse entry, and Given this situation, has to carry out sediment improvement.To think by analysis in shield driving process 3. 6,3. 8 layers of " iron plate sand " stratum be commonly called as Hangzhou, original propelling is just more difficult, and shield structure thrusts always in addition, to the continuous dehydration of the sandy soil in card, to such an extent as to be deposited on cutterhead face and support arm top, affect the propelling of shield structure.
Table 2 adds the boring parameter record sheet of the special foaming agent of 5% import Condar
Table 3 adds the boring parameter record sheet of the special foaming agent of 3% import Condar
The driving keeping identical support pressure to carry out shield structure, from table 2-3 result, after the import foam to excavation face injection Different adding amount, shield driving parameter has had obvious improvement.
Wherein, after adding import foaming agent according to 5% proportioning, make the average driving speed in driving the 20th ring ~ the 24th ring process reach 28.8mm/min, and jack gross thrust reduces about 44.3%, cutter head torque reduces about 31.0%; The phenomenon but earth's surface generation foam is emerged.
After adding import foaming agent according to 3% proportioning, make the average driving speed in driving the 30th ring ~ the 34th ring process reach 19.6mm/min, and jack gross thrust reduces about 31.7%, cutter head torque reduces about 21.5%.
Therefore domestic clear and bright foaming agent test directly adopts 3% to carry out, and test is as table 4.
Table 4 sandy silt soil stratum adds the boring parameter record sheet of 3% domestic clear and bright foaming agent
After adding domestic foaming agent according to 3% proportioning, make the average driving speed in driving the 41st ring ~ the 45th ring process reach 22.7mm/min, and jack gross thrust reduces about 31.3%, cutter head torque reduces about 26.7%.
In comprehensive scene examination tunneling process, the boring parameter fruit of shield structure, finally determines to select domestic clear and bright foaming agent.In shield-tunneling construction, carry out preparation foam solution according to the volume ratio 3%: 97% of foam dope and water, reach 15 times according to this foam liquid of test in the pressure lower frothing multiplying power of 0.03MPa, the maximum injection rate in grittiness stone soil layer reaches 50%.Be that 52m3 (loose measure) calculates and knownly needs foam dope 1.1L according to the soil discharge quantity of often tunneling a ring, need water 35.6L.
Claims (1)
1. silt sandy silt soil stratum shield machine continuously under wear intensive building shield construction method, it is characterized in that, comprise the following steps:
(1) soil improvement:
Use shield-tunneling construction soil improvement foaming agent to soil improvement before shield driving, described soil improvement foaming agent mixes obtained with water by HHZ-01 foaming agent stoste, in soil improvement foaming agent, the volume ratio of foaming agent stoste and water is 3%:97%, the consumption of soil improvement foaming agent is: often tunnel a ring and need foaming agent stoste 1.1L, water 35.6L;
(2) shield driving:
Carry out shield driving after soil improvement, the parameter of shield driving is: shield machine thrust is 1500 ~ 1900T, and cutter head torque is 1.5 ~ 2.2MNm; Support pressure is 1.8 ~ 2.2bar, fluctuates as ± 0.2bar; Driving speed is 2.5 ~ 3cm/min, controls excavation soil layer and be lost within 5 ‰ in shield tunneling process;
(3) pipe sheet assembling:
When shield machine thrust oil cylinder overhang reaches 1.2m, close conveying worm gate, shield machine stops advancing after continuing to push ahead 2 ~ 3cm, carries out pipe sheet assembling work; After every ring pipe sheet assembling completes, carry out next ring shield driving;
(4) synchronous grouting:
When shield structure pushes ahead the formation of shield tail space, synchronous grouting is carried out by the built-in Grouting Pipe of synchronous grouting system and shield tail, the grouting pressure of synchronous grouting is 4 ~ 5.5bar, synchronous grouting amount is 250% ~ 300%, the match ratio of the slurries that synchronous grouting adopts is: in every cubic metre of slurries, each material usage is: modulus is the fine sand 820 ~ 900kg of 1.6 ~ 2.2, II level flyash 400 ~ 450kg, sodium bentonite 40 ~ 60kg, water 550 ~ 600kg, slurry consistency is 120mm;
Carry out the monitoring of ground settlement when shield driving, monitoring frequency is: the front 10m of cutterhead to rear 20m, and monitoring in every 4 hours once; Otch front 20 ring, to rear 30 ring scope, monitors 3 every day; After pressure surface in 30 ring to 100 rings, monitor 1 time weekly; 100 ring to 200 ring sections after pressure surface, monthly monitor 1 time;
When every day ground settlement or accumulative ground settlement exceed 70 ~ 80% of controlling value time, carry out secondary grouting, during secondary grouting, first adopt single slurries to carry out interstitial diffusion, then adopt two slurries to fill, until surface settlement control is within the scope of controlling value; Single slurries that described secondary grouting adopts consist of cement, water, the weight proportion of single slurries is: cement: water is 1:0.8; Two slurries consist of cement, water glass, water, the weight proportion of two slurries is: cement: water glass: water is 1:0.06:0.8;
When shield driving, the uniform shield tail grease of brush is brushed to shield tail steel plate, every ring filling shield tail grease amount 35 ~ 45kg.
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|---|---|
| CN102720508A (en) | 2012-10-10 |
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