CN102720508A - 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, the job practices that particularly a kind of silt sandy silt soil stratum shield machine is worn intensive building down continuously.
Background technology
" shield construction " is the higher set of tunneling construction method of a kind of mechanization and automaticity, and since the sixties in 20th century, western developed country is applied to city underground and the construction of large size city outlet tunnel with this technology in a large number.Along with developing rapidly of urban track traffic field, metro shield worker law technology is used widely.Shield construction is to be tunneling equipment with the shield machine, does supporting with the shield shell of shield machine, with the front end knife cutting soil body, is advanced by jack pushing tow shield machine, does lining cutting with the prefabricated section of jurisdiction of assembly unit on the excavation face, thereby forms the job practices in tunnel.The metro shield fado is used for municipal construction, and the surrounding soil disturbance causes becoming flexible and depression of surrounding soil more greatly because the excavation of shield machine driving is to the tunnel, promptly causes the sedimentation on the face of land; Exist structure void that surrounding soil is also had certain influence between excavation face and lining segment; Therefore, can there be certain sedimentation in the shield-tunneling construction face of land along the line, influenced by it; Building around the tunnel will deform, sedimentation or displacement etc.; If do not take measures ground settlement is controlled,, may produce serious consequence in case take place to show sedimentation significantly.
In the shield machine tunneling process, construction parameter (like native storehouse pressure, shield structure fltting speed, the unearthed amount of shield structure, simultaneous grouting slurry match ratio etc.) is bigger to the influence of ground settlement.In existing shield-tunneling construction, through strictness control construction parameter, can face of land cumulative settling be controlled at-30mm～+ 10mm.Such sedimentation degree can meet construction requirement for general area.But thickly distinguish in house, the face of land, then need cumulative settling be controlled at ± 10mm in, just can effectively avoid the influence that causes because of ground settlement is excessive to surface buildings.Existing shield construction method still can not reach this requirement.And, be rich pigment soil flour sand area in construction environment, there is control accidentally slightly, dangerous situations such as face of land house crack promptly may take place because of ground settlement is excessive.Therefore, need more strictly to control ground settlement.Yet in rich pigment soil flour sand area, because this environment has high osmosis, poor stability, shield-tunneling construction is bigger to its influence, and there is bigger difficulty in the ground settlement of control this area.
Summary of the invention
It is bigger to the objective of the invention is to overcome existing shield construction method cumulative settling; Can not be controlled at ± 10mm is with interior deficiency; Provide a kind of silt powder stratum to wear intensive building shield construction method under continuously, this method can be controlled at face of land cumulative settling ± 10mm in.
In order to realize the foregoing invention purpose, the invention provides following technical scheme:
Wear intensive building shield-tunneling construction job practices under silt sandy silt soil stratum shield machine is continuous, may further comprise the steps:
(1) soil body improvement:
Use shield-tunneling construction soil body improvement foaming agent that the soil body is improved before the shield driving, said soil body improvement foaming agent is by HHZ-01 foaming agent stoste and water is mixed gets, and the volume ratio of foam dope and water is 3%: 97% in the soil body improvement foaming agent;
(2) shield driving:
Carry out shield driving after the soil body improvement, the parameter of shield driving is: shield machine thrust is 1500～1900T, and the cutterhead moment of torsion is 1.5～2.2MNm; Soil storehouse pressure is 1.8～2.2bar, fluctuates to be ± 0.2bar;
(3) pipe sheet assembling:
When shield machine advances the oil cylinder overhang to reach 1.2m, close the conveying worm gate, shield machine stops to advance after continuing to push ahead 2～3cm, carries out pipe sheet assembling work; After every endless tube sheet assembly unit is accomplished, carry out next ring shield driving;
(4) synchronous grouting:
When the shield structure is pushed ahead the formation of shield tail space, carry out synchronous grouting through the built-in Grouting Pipe of synchronous grouting system and shield tail, the grouting pressure of synchronous grouting is 4～5.5bar, the synchronous grouting amount is 250%～300%.
In the above-mentioned shield construction method, the soil body is improved, made that the soil body is more soft, have better workability through using the HHZ-01 foaming agent; Experimental data shows; Under aforementioned proportion and the consumption, when helping to alleviate shield driving to the disturbance of the soil body, thereby help to control ground settlement; On the other hand, soil body improvement makes that the soil body pliability of whole construction circuit is consistent, and the fltting speed and the cutterhead moment of torsion that help to keep stable in the shield driving advance; Above-mentioned job practices is optimized construction parameter, under the condition of above-mentioned job practices, can effectively control face of land cumulative settling in ± 10mm.
In order further to improve the soil body, preferred, in the above-mentioned shield construction method, the consumption of soil body improvement foaming agent is 0.21 ‰ of unearthed amount in the step (1).
In order to make shield driving can stablize propelling, preferred, in the above-mentioned shield construction method, driving speed is 2.5～3cm/min in the step (2).
In order further to control ground settlement, keep excavated volume and the equilibrium of the amount of being unearthed, in the above-mentioned shield construction method, control the excavation soil layer in the shield driving process and be lost in 5 ‰.
In order further to control ground settlement; Prevent line clogging; The match ratio of the slurries that preferably, synchronous grouting is adopted in the step in the above-mentioned shield construction method (4) is: each material usage is in every cubic metre of slurries: fineness modulus is fine sand 750～930kg of 1.6～2.2, and gray scale is the flyash 390～455kg of II level; Sodium bentonite 40～65kg, water 550～650kg.Further being preferably of the proportioning of above-mentioned slurries: each material usage is in every cubic metre of slurries: modulus is fine sand 820～900kg of 1.6～2.2, II level flyash 400～450kg, sodium bentonite 40～60kg, water 550～600kg.
In order further to control ground settlement, preferred, when shield driving, carry out the monitoring of ground settlement, monitoring frequency is: the preceding 10m of cutterhead is 20m to the back, monitors once in per 4 hours; Otch the place ahead 20 rings are 30 ring scopes to the rear, monitor every day 3 times; 30 rings are monitored weekly 1 time to 100 rings behind the pressure surface; 100 rings are to 200 ring sections, monitoring in every month 1 time behind the pressure surface;
When every day ground settlement or accumulative total ground settlement surpass controlling value 70～80% the time, carry out secondary grouting, adopt single liquid slurry to carry out interstitial diffusion during secondary grouting earlier, adopt the biliquid slurry to fill then, in ground settlement is controlled at the controlling value scope.
Preferably, in the above-mentioned shield construction method, single slurries that said 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 the above-mentioned shield construction method, every day ground settlement be controlled at ± 3mm in, accumulative total ground settlement be controlled at+3～± 10mm in.
Scurry into the tunnel in order to prevent shield machine when driving underground water and simultaneous grouting slurry from the shield tail; Protected the shield ventral brush simultaneously; Reach the sealing function of shield structure, also comprise filling shield tail oil fat step in the above-mentioned shield construction method: when shield driving, shield tail steel plate is brushed the uniform shield tail oil fat of brush.
Compared with prior art, beneficial effect of the present invention:
1, shield construction method of the present invention uses foam solution that the soil body is improved, and makes that the soil body is more soft, have better workability, can alleviate the disturbance of shield structure to the soil body during driving, and then reduce ground settlement; On the other hand, soil body improvement makes that the soil body pliability of whole construction circuit is consistent, and then makes the shield structure can keep stable fltting speed and cutterhead moment of torsion to advance, and has improved operating efficiency, has reduced construction cost.
2, adopt shield construction method of the present invention; The single sedimentation of building can be controlled in the 3mm; In the settlement monitoring point of the face of land and building, 97.3% monitoring point settlement Control has been guaranteed the safety and normal use of unimpeded, the building of tunnel upper road in 10mm.
The specific embodiment
Below in conjunction with the Test Example and the specific embodiment the present invention is made further detailed description.But should this be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment, allly all belong to scope of the present invention based on the technology that content of the present invention realized.
Embodiment
With certain silt sandy silt soil stratum shield-tunneling construction is example, and this project two-wire total length 2238.442m amounts to section of jurisdiction 1866 rings, 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 rings, wherein left line length 1116.447m (931 ring), right line length 1121.995m (935 ring).Interval plane least radius 450m, vertically minimum grade is 2 ‰, maximum gradient is 25.567 ‰.The minimum buried depth in center, tunnel is 12.635m, and maximum buried depth is 20.35m.Left side line is advanced into 21 rings, intensive house is worn under beginning continuously in right line 22 ring tunnels, accomplishes passing through of residential block to left line propelling 695 rings, right line 701 rings, wears raw water tubes under beginning, pastes Shahe; When left tunnel line advances 715 rings, right line 721 rings, accomplish passing through of subsides Shahe and begin rail wear trestle down.After wearing the construction of accomplishing the railway trestle under the shield machine, just descend successively behind rail wear station track, discarded stake, walkway, overhead waiting hall and the Zhejiang Railway Hotel and the arrival reception of station, station, city.What the interval was passed through mainly is that the silt sandy silt soil stratum 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 mud matter silty clay, 1 farinose argillic horizon, 2 layers of silty clay.Interval silt, flour sand layer all are saturation state, and permeability is omited, and belong to aquitard; Be main phreatic aquifer; Its mechanical property has remarkable characteristic of thixotropic property and flowability, under the hydrodynamic condition effect, is prone to produce piping, quicksand and thixotropy phenomenon; Thereby reduce soil layer construction intensity, influence construction safety.
This silt powder stratum shield construction method may further comprise the steps:
(1) soil body improvement:
Use shield-tunneling construction soil body improvement foaming agent that the soil body is improved before the shield driving; Said soil body improvement foaming agent is by homemade clear and bright HHZ-01 foaming agent stoste and water is mixed gets; The volume ratio of foam dope and water is 3%: 97% in the soil body improvement foaming agent; The consumption of foaming agent is: every driving one ring needs foam dope 1.1L, water 35.6L;
(2) shield driving:
Carry out shield driving after the soil body improvement, the parameter of shield driving is: shield machine thrust is 1500～1900T, and the cutterhead moment of torsion is 1.5～2.2MNm; Soil storehouse pressure is 1.8～2.2bar, fluctuates to be ± 0.2bar; Driving speed is 2.5～3cm/min; The loss of excavation soil layer will be controlled in 5 ‰, and the unearthed amount of strict control is accomplished the excavated volume and the amount equilibrium of being unearthed.This tunnel excavation diameter 6.2m considers shield attitude changes or other reasons causes the soil layer loss and the soil layer coefficient of volumetric expansion, and every ring 1.2m is unearthed and measures about 38.4m
3
(3) pipe sheet assembling:
When shield machine advances the oil cylinder overhang to reach 1.2m, close the conveying worm gate, shield machine stops to advance after continuing to push ahead 2～3cm, carries out pipe sheet assembling work; After every endless tube sheet assembly unit is accomplished, carry out next ring shield driving;
(4) synchronous grouting:
When the shield structure is pushed ahead the formation of shield tail space, carry out synchronous grouting through the built-in Grouting Pipe of synchronous grouting system and shield tail, the grouting pressure of synchronous grouting is 4～5.5bar; The synchronous grouting amount is 6.8-7.5 side; The match ratio of the slurries that synchronous grouting adopted is: each material usage is in every cubic metre of slurries: modulus is 1.6～2.2 the about 900kg of fine sand, the about 450kg of II level flyash, sodium bentonite 40～60kg; Water 550～600kg, slurry consistency are 120mm.Simultaneous grouting slurry makes through following method: (1) adds sodium bentonite and water in slurry mixing tank, the consumption of water is 1/3 of a sodium bentonite consumption, mixes system 30min; (2) in slurry mixing tank, to drop into fineness modulus be 1.6～2.2 fine sand, ash for gray scale is that the flyash and the water of II level is mixed system, mixes system 20min.
In the above-mentioned shield construction method, the soil body is improved, made that the soil body is more soft, have better workability through using the HHZ-01 foaming agent; 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, when helping to alleviate shield driving to the disturbance of the soil body, thereby help to control ground settlement; On the other hand, soil body improvement makes that the soil body pliability of whole construction circuit is consistent, and the fltting speed and the cutterhead moment of torsion that help to keep stable in the shield driving advance; Above-mentioned job practices is optimized construction parameter, under the condition of above-mentioned job practices, can effectively control face of land cumulative settling in ± 10mm.
When shield driving, carry out the monitoring of ground settlement, monitoring frequency is: the preceding 10m of cutterhead is 20m to the back, and monitoring in per 4 hours once; Otch the place ahead 20 rings are 30 ring scopes to the rear, monitor every day 3 times; 30 rings are monitored weekly 1 time to 100 rings behind the pressure surface; 100 rings are to 200 ring sections, monitoring in every month 1 time behind the pressure surface;
When every day ground settlement surpass ± when 2mm or accumulative total ground settlement surpass 7mm, carry out secondary grouting, use single liquid slurry to carry out interstitial diffusion earlier, adopt the biliquid slurry to fill then, in ground settlement is controlled at the controlling value scope.Said 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.
Scurry into the tunnel in order to prevent shield machine when driving underground water and simultaneous grouting slurry from the shield tail; Protected the shield ventral brush simultaneously; Reach the sealing function of shield structure; Also comprise filling shield tail oil fat step in the above-mentioned shield construction method: when shield driving, shield tail steel plate is brushed the uniform shield tail oil fat of brush, every ring filling shield tail oil quantity 35～45kg.
Adopt the simultaneous grouting slurry of above-mentioned cooperation preparation method's preparation when, have good workability and pumpability, can alleviate the disturbance of construction, reduced the slurries segregation simultaneously, stopped up the Grouting Pipe phenomenon, accelerated construction speed the soil body.
Through adopting above-mentioned silt sandy silt soil stratum shield construction method; This project has overcome existing shield construction method can not satisfy the requirement of rich pigment soil sandy silt soil stratum shield-tunneling construction to ground settlement; Make the single settlement Control of building in 3mm, in the settlement monitoring point of the face of land and building, 97.3% monitoring point settlement Control is in 10mm; The safety and normal use of unimpeded, the building of tunnel upper road have been guaranteed; The life to the resident does not have any impact, and has safeguarded the favorable image in city, and environmental benefit is good.
The selection test of Test Example soil body improvement foaming agent
Carrying out soil body improved test with the test section in the similar location of embodiment; Soil body improvement foaming agent is selected; Be beneficial to effectively control ground settlement; In process of the test, use the import Condar special and homemade clear and bright respectively according to 3%, 5% proportioning and do not use foaming agent to carry out field trial respectively, its shield driving parameter is respectively as showing shown in the 1-table 4.
Table 1 sandy silt soil stratum does not add the boring parameter of foam
Table 1 is the result show; Under the situation of using foaming agent that the soil body is improved, the situation of the excessive autostop of cutterhead moment of torsion repeatedly takes place, and the shield structure advances slowly in tunneling process; Only can maintain 2mm/min; Mechanical load strengthens, and temperature is up to more than 50 ° in the tunnel, and material consumptions such as shield tail oil fat, cutterhead grease are huge; Furthermore do not have drilling depth shield structure to be unearthed and show as the water and soil released state, had a strong impact on the civilized construction in tunnel.Advance because the shield structure is positioned at rich pigment soil sandy silt soil stratum, the face of land 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 the dregs improvement.Through think in the shield structure progradation 3. 6,3. 8 layers of " iron plate sand " stratum that is commonly called as for Hangzhou; The original relatively difficulty that just advances, the shield structure thrusts always in addition, the continuous dehydration of sandy soil on the card; To such an extent as to be deposited on cutterhead face and support arm top, influence 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
Keeping identical native storehouse pressure to carry out the driving of shield structure, 2-3 result can know that after injecting the import foam of different additions to the excavation face, the shield driving parameter has had tangible improvement from table.
Wherein, add the import foaming agent according to 5% proportioning after, make that the average driving speed in driving the 20th ring～the 24 ring process reaches 28.8mm/min, and the jack gross thrust reduces approximately 44.3%, the cutterhead moment of torsion reduces about 31.0%; The phenomenon but face of land generation foam is emerged.
After adding the import foaming agent according to 3% proportioning, make that the average driving speed in driving the 30th ring～the 34 ring process reaches 19.6mm/min, and the jack gross thrust reduces approximately 31.7%, the cutterhead moment of torsion reduces about 21.5%.
Therefore homemade clear and bright foaming agent test directly adopts 3% to carry out, and test is like table 4.
Table 4 sandy silt soil stratum adds the boring parameter record sheet of 3% homemade clear and bright foaming agent
After adding homemade foaming agent according to 3% proportioning, make that the average driving speed in driving the 41st ring～the 45 ring process reaches 22.7mm/min, and the jack gross thrust reduces approximately 31.3%, the cutterhead moment of torsion reduces about 26.7%.
The boring parameter fruit of shield structure in the process is advanced in comprehensive on-the-spot sondage, finally confirms to select for use homemade clear and bright foaming agent.Volume ratio according to foam dope and water in shield-tunneling construction is prepared foam solution at 3%: 97%, reaches 15 times according to this foam liquid of test in the pressure lower frothing multiplying power of 0.03MPa, and the maximum injection rate in grittiness stone soil layer reaches 50%.According to the casting amount of every driving one ring is that 52m3 (loose measure) calculates and can know and need foam dope 1.1L, needs water 35.6L.
Claims (9)
1. silt sandy silt soil stratum shield machine is worn intensive building shield-tunneling construction job practices under continuously, may further comprise the steps:, it is characterized in that, may further comprise the steps:
(1) soil body improvement:
Use shield-tunneling construction soil body improvement foaming agent that the soil body is improved before the shield driving, said soil body improvement foaming agent is by HHZ-01 foaming agent stoste and water is mixed gets, and the volume ratio of foam dope and water is 3%:97% in the soil body improvement foaming agent;
(2) shield driving:
Carry out shield driving after the soil body improvement, the parameter of shield driving is: shield machine thrust is 1500～1900T, and the cutterhead moment of torsion is 1.5～2.2MNm; Soil storehouse pressure is 1.8～2.2bar, fluctuates to be ± 0.2bar; Driving speed is 2～3cm/min;
(3) pipe sheet assembling:
When shield machine advances the oil cylinder overhang to reach 1.2m, close the conveying worm gate, shield machine stops to advance after continuing to push ahead 2～3cm, carries out pipe sheet assembling work; After every endless tube sheet assembly unit is accomplished, carry out next ring shield driving;
(4) synchronous grouting:
When the shield structure is pushed ahead the formation of shield tail space, carry out synchronous grouting through the built-in Grouting Pipe of synchronous grouting system and shield tail, the grouting pressure of synchronous grouting is 4～5.5bar, the synchronous grouting amount is 250%～300%.
2. shield construction method according to claim 1 is characterized in that, the consumption of soil body improvement foaming agent is 0.21 ‰ of the amount of being unearthed in the step (1).
3. shield construction method according to claim 1 is characterized in that, driving speed is 2.5～3cm/min described in the step (2).
4. shield construction method according to claim 1 is characterized in that, controls the excavation soil layer in the step (2) in the shield driving process and is lost in 5 ‰.
5. shield construction method according to claim 1; It is characterized in that; The match ratio of the slurries that synchronous grouting is adopted in the step (4) is: each material usage is in every cubic metre of slurries: fineness modulus is 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.
6. shield construction method according to claim 5; It is characterized in that; The match ratio of the slurries that synchronous grouting is adopted in the step (4) is: each material usage is in every cubic metre of slurries: modulus is fine sand 820～900kg of 1.6～2.2, II level flyash 400～450kg, sodium bentonite 40～60kg; Water 550～600kg, slurry consistency are 120mm.
7. any described shield construction method of claim 1-6 is characterized in that, further comprising the steps of: when shield driving, carry out the monitoring of ground settlement, monitoring frequency is: the preceding 10m of cutterhead is 20m to the back, and monitoring in per 4 hours once; Otch the place ahead 20 rings are 30 ring scopes to the rear, monitor every day 3 times; 30 rings are monitored weekly 1 time to 100 rings behind the pressure surface; 100 rings are to 200 ring sections, monitoring in every month 1 time behind the pressure surface;
When every day ground settlement or accumulative total ground settlement surpass controlling value 70～80% the time, carry out secondary grouting, adopt single liquid slurry to carry out interstitial diffusion during secondary grouting earlier, adopt the biliquid slurry to fill then, in ground settlement is controlled at the controlling value scope.
8. shield construction method according to claim 7 is characterized in that, single slurries that said 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.
9. according to any described shield construction method of claim 1-6, it is characterized in that, also comprise filling shield tail oil fat step: when shield driving, shield tail steel plate is brushed the uniform shield tail oil fat of brush.
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