CN1854462A - Shiedling construction without influence on top layer of earth - Google Patents
Shiedling construction without influence on top layer of earth Download PDFInfo
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- CN1854462A CN1854462A CN 200510025501 CN200510025501A CN1854462A CN 1854462 A CN1854462 A CN 1854462A CN 200510025501 CN200510025501 CN 200510025501 CN 200510025501 A CN200510025501 A CN 200510025501A CN 1854462 A CN1854462 A CN 1854462A
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Abstract
A construction method by using tunnel shield includes pre-set front earth pressure; improve front earth performance; control seal effect of tail shield; slurry pouring in simultaneously; and monitor shield progress.
Description
Technical field
The present invention relates to a kind of shield driving job practices of construction work, especially a kind of shield driving job practices that is used in silty strata propelling and Tunnel Crossing Piles of Building.
Background technology
At present, in the constructing tunnel, generally adopt the shield driving job practices.Especially in the city underground constructing tunnel, obtain a large amount of application.Yet for soil layer in the interval shield driving engineering of city underground is silty soil, and stream plasticity is poor, and water content height and underground obstacle are many etc., adopt existing shield driving job practices can produce following several problem:
(1) driving difficulty.Because the sand angle of internal friction causes bigger frictional resistance greatly, make under the equal conditions the normal weak soil of driving pressure ratio big, and sand grains is pressed tight more more in the pressure chamber because of dehydration is fixed, cause jack pressure to increase, the cutterhead moment of torsion increases, make difficult cutting even can't carry out, cause cutterhead simultaneously, the base bearing excessive wear.
(2) the excavation face is inhomogeneous.When earth pressure balanced shield, EPBS is constructed in sandy soil layer because sandy soil stream plasticity extreme difference, the soil body that cuts can not be full of whole pressure chamber, make in the cabin mud density up-small and down-big, be difficult to form the pressure that uniform pressure curtain comes dynamic equilibrium shield structure the place ahead.Therefore under high water head pressure, big cutterhead cutting vibration may cause near the sand liquefaction work plane, its shear strength is reduced greatly even loses, thereby cause the unstability of the top soil body.
(3) soil-discharging port is gushed.Generally, the water pressure of mud in the exit of soil output is zero in the cabin, fall into transport tape in the deadweight effect, yet when in the bigger sandy soil of permeability, constructing, the water pressure of the soil body in pressure chamber and the dumper on can not opposing excavation face in full force and effect, will produce at the oral area of soil output and gush, cause the pollution of work plane.
As the interval shield structure forward engineer of Shanghai City track traffic Brilliant Pearl Line the second stage of the project " Liyang way station-face level road station ", this running tunnel top thickness of earth covering 3.9m-13m, shield machine mainly passes through grey cement soil layer and two layers of grey sandy silt layer, full section passes through first floor grey sandy silt layer on wherein most of length, this layer soil has clay content low (less than 10%), stream plasticity is poor, and characteristics such as easy compression are very unfavorable to shield driving.The pipeline that passes through along the line of this running tunnel mainly is to pass through under the road and in the residential block and pipelines such as various coal gas, water pipe, phone and cable simultaneously.
Summary of the invention
The present invention is that will to solve existing shield driving job practices be silty soil at soil layer; stream plasticity is poor; the construction problem that exists under the conditions such as water content height and underground obstacle are many; and provide a kind of energy to solve the driving difficulty that shield-tunneling construction is prone in silty soil; soil body unstability; soil-discharging port problem and can effectively protect the building that repeatedly passes through, the Shiedling construction without influence on top layer of earth of underground utilities along the line such as gush.
For realizing purpose of the present invention, and the technical method that adopts is: a kind of Shiedling construction without influence on top layer of earth, and its method and step: (1) sets positive soil pressure; (2) improve head soil body performance; (3) control shield tail shutoff quality; (4) synchronous grouting; (5) monitoring shield driving process.
Set its setting value of positive soil pressure 1.4 times for the earth pressue at rest on stratum, shield structure cutter center.
The concrete grammar that improves head soil body performance is: (1) injects sliding agent in the body of front in the shield driving process, to reduce the driving torque of cutterhead, reduces the oil pressure of cutterhead, and makes sand have suitable workability; (2) inject the water that is mixed with common sliding agent at shallow earthing place, injection rate is controlled at 2～5m
3/ h (needing to adjust) according to the oil pressure of cutterhead; (3) burying underground, effectively reduce the cutterhead oil pressure, the eruption that improves driving speed and prevent the screw machine soil outlet than depths employing foaming agent.
The concrete grammar of control shield tail shutoff quality is: control tunneling direction during shield driving well, keep around the gap of section of jurisdiction outer wall and shield machine inwall evenly the sealing of shield tail being brushed being in normal duty; Strengthen the pressure injection of tail seal grease of shield in the shield driving process, to guarantee the sealing performance of shield tail sealing brush.
The concrete grammar of synchronous grouting is: in shield structure progradation, carry out synchronous grouting in the annular building space, the lining cutting back side of deviating from the shield tail, adopt inert slurry, form through fully stirring by swell soil, water, flyash, yellow ground, its match ratio (weight ratio) is 1: 5: 3.5: 7, and slurry consistency is controlled at 8-10cm; When shield structure passing through building, underground utilities, carry out secondary grouting when going out shield tail 8～10 rings in the section of jurisdiction.
The concrete grammar of monitoring shield driving process is: under the normal condition, one day twice of construction monitoring, but before the shield structure is appeared, be provided with 3 deep settlement measurement points on construction ground, every driving 30cm observation once, with the vertical displacement situation of change on stratum in the monitoring shield structure progradation, grasp the setting of boring parameter; When important excessively building and pipeline, carry out tracking and monitoring, in time adjust positive soil pressure, the driving speed of shield machine, the setting of grouting amount parameter according to monitoring result, guarantee the safety of above ground structure and surrounding environment.
Job practices of the present invention is injected the water that is mixed with common sliding agent by the soil body at shallow overburden layer place, thereby effectively improved soil body performance and reduced the cutterhead oil pressure burying technical measures such as adopting foaming agent than the depths and control device underground, improve driving speed, can solve the problem that shield-tunneling construction is prone in silty soil driving difficulty, soil body unstability, soil-discharging port are gushed, and can control ground settlement, reach ground settlement to be controlled at-the 2mm-15mm target; In addition, owing to adopt monitoring shield driving process, instruct the setting of shield driving parameter with monitored data, carry out information-aided construction, the safety of ground and surrounding environment in the time of can guaranteeing the propelling of shield structure, control the displacement of ground and pipeline effectively, make the accumulative total maximum settlement amount of each monitoring point all less than 4mm.
The specific embodiment
The present invention is further illustrated below in conjunction with embodiment.
Shiedling construction without influence on top layer of earth, its method and step are:
(1) rationally set positive soil pressure:
Because of the grittiness soil characteristics, the shield structure tunnels as easy as rolling off a log causing and backbreaks in sandy soil layer, backbreaking to cause the bigger sedimentation in ground, so should suitably improve the setting value of positive soil pressure in this case, general positive soil pressure sets value 1.4 times for the earth pressue at rest on stratum, shield structure cutter center.By improving the setting value of positive soil pressure, make the sandy soil in shield structure front produce extruding drainage effect, reduce the flowing pressure of the soil body in the native cabin, prevent the liquefaction of sand in the conveying worm.
(2) improve head soil body performance:
A. in the shield driving process, in the soil body of front, inject sliding agent,, reduce the oil pressure of cutterhead, and make sand have suitable workability to reduce the driving torque of cutterhead;
B. inject the water that is mixed with common sliding agent at shallow earthing place, injection rate is controlled at 2～5m
3/ h (needing to adjust) according to the oil pressure of cutterhead;
C. burying underground, effectively reduce the cutterhead oil pressure, the eruption that improves driving speed and prevent the screw machine soil outlet than depths employing foaming agent.
The filling foaming agent can reduce ground settlement effectively under the condition on equal boring parameter society top, ground settlement can from the common sliding agent of annotating-10mm ~-30mm eases down to-2mm ~-15mm.In addition, the filling foaming agent can effectively prevent the eruption of screw machine soil outlet.
(3) control shield tail shutoff quality:
Control tunneling direction during shield driving well, keep around the gap of section of jurisdiction outer wall and shield machine inwall evenly being in the works fine state as far as possible to guarantee shield tail sealing brush.
Strengthen the pressure injection of tail seal grease of shield in the shield driving process, to guarantee the sealing performance of shield tail sealing brush.
(4) synchronous grouting:
Stable and carry out the adjustment of parameters except that the front of control shield structure, also need in time carry out synchronous grouting.In shield structure progradation, slurries carry out synchronous grouting with the quantity and the reasonable proportioning of suitable pressure, necessity in the annular building space, the lining cutting back side of deviating from the shield tail, and this is the key measure that reduces surface settlement in sandy soil.
What this interval uplink adopted is inert slurry, is formed through fully stirring by swell soil, water, flyash, yellow ground, and its match ratio (weight ratio) is 1: 5: 3.5: 7, and slurry consistency is controlled at about 9cm, and is rare excessively, the easy spillage of shield tail; The blocked up grouting pipeline that then stops up easily.
Theoretical lining cutting outer ring structure void was 1.521m when the shield structure advanced
3, theoretic slurries only need 100% filling structure void get final product, though consider that the dehydration contraction of slurries, shield structure are rectified a deviation, the splitting of part slurries in stratum on every side, influence such as shield machine housing peripheral zone soil, grouting amount is the 120%-180% of calculated value.
Guaranteeing the shield tail not under the prerequisite of spillage, the actual grouting amount in this interval is the 200%-270% of theoretical structure void; Slip casting is synchronous with driving.Slip casting time lag, do not have the section of jurisdiction and throw off the purpose that the control top soil body sinks behind the shield tail.
When shield structure passing through building, underground utilities, in order to remedy the deficiency of synchronous grouting, reduce surface settlement, carry out secondary grouting when going out shield tail 8-10 ring in the section of jurisdiction.
(5) monitoring shield driving process:
The ground surface environment monitoring is a reliable means of guaranteeing above ground structure and underground utilities safety.Instruct the setting of shield driving parameter with monitored data, carry out information-aided construction, the safety of ground and surrounding environment when guaranteeing that the shield structure advances.
Under the normal condition, one day twice of construction monitoring.But before the shield structure is appeared, be provided with 3 deep settlement measurement points on construction ground, every driving 30cm observation once, with the vertical displacement situation of change on stratum in the monitoring shield structure progradation, whether the setting of grasping boring parameter reasonable.
When important excessively building and pipeline such as sewage dam arm, gas pipe, upper hose, except one day twice normal monitoring, also carry out tracking and monitoring, in time adjust the isoparametric setting of positive soil pressure, driving speed, grouting amount of shield machine according to monitoring result, guarantee the safety of above ground structure and surrounding environment.
Claims (6)
1. Shiedling construction without influence on top layer of earth, it is characterized in that: its method and step are; (1) sets positive soil pressure; (2) improve head soil body performance; (3) control shield tail shutoff quality; (4) synchronous grouting; (5) monitoring shield driving process.
2. Shiedling construction without influence on top layer of earth according to claim 1 is characterized in that its setting value of the positive soil pressure of described setting 1.4 times for the earth pressue at rest on stratum, shield cutter center.
3. Shiedling construction without influence on top layer of earth according to claim 1, it is characterized in that, the described concrete grammar that improves head soil body performance is: (1) injects sliding agent in the soil body of front in the shield driving process, to reduce the driving torque of cutterhead, reduce the oil pressure of cutterhead, and make sand have suitable workability; (2) inject the water that is mixed with common sliding agent at shallow earthing place, injection rate is controlled at 2～5m
3/ h (needing to adjust) according to the oil pressure of cutterhead; (3) burying underground, effectively reduce the cutterhead oil pressure, the eruption that improves driving speed and prevent the screw machine soil outlet than depths employing foaming agent.
4. Shiedling construction without influence on top layer of earth according to claim 1, it is characterized in that, the concrete grammar of described control shield tail shutoff quality is: control tunneling direction during shield driving well, keep the gap of section of jurisdiction outer wall and shield machine inwall even all around, make shield tail sealing brush be in normal duty; Strengthen the pressure injection of tail seal grease of shield in the shield driving process, to guarantee the sealing performance of shield tail sealing brush.
5. Shiedling construction without influence on top layer of earth according to claim 1, it is characterized in that, the concrete grammar of described synchronous grouting is: in shield structure progradation, carry out synchronous grouting in the annular building space, the lining cutting back side of deviating from the shield tail, adopt inert slurry, formed through fully stirring by swell soil, water, flyash, yellow ground, its match ratio (weight ratio) is 1: 5: 3.5: 7, and slurry consistency is controlled at 9cm; When shield structure passing through building, underground utilities, carry out secondary grouting when going out shield tail 8～10 rings in the section of jurisdiction.
6. the Shiedling construction without influence on top layer of earth of establishing according to claim 1 is characterized in that, the concrete grammar of described monitoring shield driving process is: under (1) normal condition, and one day twice of construction monitoring; (2) before the shield structure is appeared, 3 deep settlement measurement points are set on construction ground, every driving 30cm observation once with the vertical displacement situation of change on stratum in the monitoring shield structure progradation, is grasped the setting of boring parameter; (3) when important excessively building and pipeline, carry out tracking and monitoring, in time adjust positive soil pressure, the driving speed of shield machine, the setting of grouting amount parameter, guarantee the safety of above ground structure and surrounding environment according to monitoring result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510025501 CN1854462A (en) | 2005-04-28 | 2005-04-28 | Shiedling construction without influence on top layer of earth |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510025501 CN1854462A (en) | 2005-04-28 | 2005-04-28 | Shiedling construction without influence on top layer of earth |
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| CN1854462A true CN1854462A (en) | 2006-11-01 |
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| CN 200510025501 Pending CN1854462A (en) | 2005-04-28 | 2005-04-28 | Shiedling construction without influence on top layer of earth |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606163A (en) * | 2012-03-20 | 2012-07-25 | 天津城建隧道股份有限公司 | Shield tunnel construction ground settlement control method |
| CN102720508A (en) * | 2012-04-28 | 2012-10-10 | 中铁二局股份有限公司 | Shield construction method for continuously under-passing dense buildings in silty-soil and silty-sand formation |
| CN106437723A (en) * | 2016-08-08 | 2017-02-22 | 中国矿业大学(北京) | Grouting method for controlling stratum settlement when shield tunneling machine passes through risk source |
| CN107165642A (en) * | 2017-06-06 | 2017-09-15 | 中铁十九局集团轨道交通工程有限公司 | Accurately control the shield construction method of ground settlement |
| CN108643937A (en) * | 2018-04-27 | 2018-10-12 | 中铁十二局集团有限公司 | The prevention restoration methods of residential area are worn under hydraulic tunnel |
-
2005
- 2005-04-28 CN CN 200510025501 patent/CN1854462A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606163A (en) * | 2012-03-20 | 2012-07-25 | 天津城建隧道股份有限公司 | Shield tunnel construction ground settlement control method |
| CN102720508A (en) * | 2012-04-28 | 2012-10-10 | 中铁二局股份有限公司 | Shield construction method for continuously under-passing dense buildings in silty-soil and silty-sand formation |
| CN106437723A (en) * | 2016-08-08 | 2017-02-22 | 中国矿业大学(北京) | Grouting method for controlling stratum settlement when shield tunneling machine passes through risk source |
| CN107165642A (en) * | 2017-06-06 | 2017-09-15 | 中铁十九局集团轨道交通工程有限公司 | Accurately control the shield construction method of ground settlement |
| CN108643937A (en) * | 2018-04-27 | 2018-10-12 | 中铁十二局集团有限公司 | The prevention restoration methods of residential area are worn under hydraulic tunnel |
| CN108643937B (en) * | 2018-04-27 | 2020-01-31 | 中铁十二局集团有限公司 | Prevention and recovery method for hydraulic tunnel lower-crossing residential area |
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