CN102758635A - Construction method for tool changing under pressure in shield of water-rich silty soil and silty sand stratum under station tracks of railways - Google Patents
Construction method for tool changing under pressure in shield of water-rich silty soil and silty sand stratum under station tracks of railways Download PDFInfo
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- CN102758635A CN102758635A CN2012102686825A CN201210268682A CN102758635A CN 102758635 A CN102758635 A CN 102758635A CN 2012102686825 A CN2012102686825 A CN 2012102686825A CN 201210268682 A CN201210268682 A CN 201210268682A CN 102758635 A CN102758635 A CN 102758635A
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Abstract
The invention discloses a construction method for tool changing under pressure in a shield of the water-rich silty soil and silty sand stratum under station tracks of railways. The construction method comprises the following steps of: carrying out reinforcement on a soil body at a tool changing position by adopting a high-pressure rotary jet pile; inspecting whether holes exist on the ground surface in the soil reinforcing area, and adjusting the tunneling posture and the tunneling direction of a shield machine; after reinforcing soil enters a cutting port of the shield machine, reducing the pressure of a soil warehouse, and adjusting construction parameters; injecting bentonite into the soil warehouse of the shield; determining an air pressure value, and determining a tool-changing air pressure value in the soil warehouse according to the obtained water-soil pressure value; and finally, clearing the warehouse, and reducing the pressure; and workers enter to change a tool, and after tool changing, the shield machine restores the tunneling working state. The construction method disclosed by the invention has the advantages that the risk that water-rich soft soil is easy to flow to cause collapse when the tool is changed under pressure in tunnel shield construction of the water-rich silty soil and silty sand stratum is overcome, and the operation safety of upper railways is ensured.
Description
Technical field
The present invention relates to the shield-tunneling construction technical field, rich pigment soil sandy silt soil stratum shield structure band is pressed the job practices of tool changing under particularly a kind of railway station track.
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.Shield machine carries out earth cutting and catalase through cutter in tunnel excavating process; Shield machine long distance driving back is because tool wear need be carried out cutter changing; And be with the pressure tool changing is an excessive risk operation, is rich pigment soil sandy silt soil stratum under the railway station track in construction environment especially, has control accidentally slightly; Ground, railway station track, top promptly may take place because of ground settlement is excessive cave in, have a strong impact on railway operation safety.
Summary of the invention
The objective of the invention is to overcome existing above-mentioned deficiency in the prior art, the job practices of rich pigment soil sandy silt soil stratum shield structure band pressure tool changing under a kind of railway station track is provided.The inventive method has overcome the risk that the easy quicksand of rich water weak soil caved in when band was pressed tool changing in the rich pigment soil sandy silt soil stratum constructing tunnel under the railway station track, guarantees the operation security of top railway.
In order to realize the foregoing invention purpose, the invention provides following technical scheme:
Rich pigment soil sandy silt soil stratum shield structure band is pressed the job practices of tool changing under a kind of railway station track, and said method comprises the steps:
Preparation before A, the tool changing:
Adopt high-pressure rotary jet grouting pile that the tool changing place soil body is reinforced; Whether the face of land in the soil stabilization district is existed hole inspection, if exist hole then to utilize cement mortar that hole is carried out shutoff; Feed back to shield structure measuring system through concrete measurement face of land tool changing mileage and confirm shield machine tool changing place, the driving attitude and the direction of adjustment shield machine guarantee that shield machine arrives the tool changing point smoothly before shield machine arrives the tool changing place.
Construction parameter adjustment behind B, the shield machine contact compacted soil:
The shield machine otch slowly reduces native storehouse pressure according to detection case after getting into compacted soil, and native storehouse pressure is not less than 1.5bar; Shield machine shield structure fltting speed is controlled in the 1cm/min; The cutter head of shield machine rotating speed is controlled at 1 rev/min; Shield machine shield tail oil fat is controlled at the 29-31kg/ ring.
C, pressure are annotated swell soil:
Shield structure soil injects swell soil in the storehouse, utilizes the slit of radial hole between fuselage and compacted soil of shield machine fuselage to carry out bentonitic pressure notes.
D, band are pressed tool changing:
Confirm atmospheric pressure value, confirm tool changing atmospheric pressure value in the native storehouse according to the water and soil force value that calculates.
Bring down stocks to build pressure, export the dregs in the native storehouse to native storehouse topmost peep hole, be unearthed after the completion, survey situation in the native storehouse; Soil under all right situation, continues to be unearthed to 4-6cm place, people's lock below in the storehouse, adopts respirator system to pressurize at this moment, and the person of sending someone entering people lock is observed native storehouse environment; Be unearthed once more to the shield machine middle part, personnel get into tool changing, and shield machine recovers the headwork state after the tool changing.
Wherein, tool changing place soil stabilization adopts φ 600 high-pressure rotary jet grouting piles to reinforce in the said steps A, stake stake overlap joint 200mm, and cement mixing content is 35%, cement 28d compressive strength is not less than 2.0Mpa; Reinforcement depth is below ground 25.45m, and face of land 3.45m does not reinforce, and promptly effective reinforcement depth is 22m, and reinforcing length is 37.2m, and the reinforcing width is 7.6m, guarantees railway security and tool changing safety.
Adjust the driving attitude and the direction of shield machine in the said steps A before the shield machine arrival tool changing place; Guarantee that shield machine arrives the tool changing point smoothly; Shield machine arrives driving attitude and the direction that preceding 30 rings in tool changing place are checked a shield machine; Through preceding 15 rings the attitude and the tunneling direction of shield structure are adjusted to normal range (NR) (± 50mm scope), this moment, cutter head of shield machine stretched out 5cm, prevented that shield structure stabilization zone driving is stuck.
Preferably, shield machine shield tail oil fat is the 30kg/ ring among the said step B.(inferior
The swell soil that uses among the said step C adopts thin mould degree sodium bentonite; And the bentonite slurry fit quality is than being swell soil: water=250kg:1000kg; Swell soil proportion is 1.2g/cm3, and swell soil viscosity is 35s, guarantees the good gas retaining after swell soil injects the soil body.
Further, swell soil adopts external pipe directly to press notes, presses the notes mode to have two kinds,
1) shift to an earlier date radial hole pressure notes in the 5 ring shields, set up shield body periphery mud film, swelling soil pressure notes are controlled according to pressure, after pressure is greater than 5bar, stops pressure and annotate; Perhaps
2) press the notes swell soil in the native storehouse, set up face mud film; Set up mud and constantly carry out dregs displacement in the native storehouse through conveying worm when unconcerned, the slag that goes out when the conveying worm soil outlet stops displacement when being swell soil; Per tour utilizes fresh bentonite slurry to carry out the unconcerned maintenance work of face mud, and maintenance adopts fresh swell soil to fill with Tu Cang.
Confirm that according to the water and soil force value that calculates native storehouse internal gas pressure value is specially among the said step D: calculate the water and soil force value according to formula P=k0gh; The tool changing atmospheric pressure value is than the high 0.1～0.2bar of water and soil force value in the soil storehouse; Wherein P is the water and soil force value; K0 is the side direction static balance pressure coefficient of soil, and g is the weighted average severe of the soil body, and h is center, a tunnel buried depth.
Compared with prior art, beneficial effect of the present invention:
The inventive method is through reinforcing the tool changing place soil body; Adjustment attitude of shield machine, tunneling direction and construction parameter are pressed the good gas retaining of annotating after swell soil is guaranteed its injection soil body, tool changing atmospheric pressure value in the unearthed storehouse of accurate Calculation; And through on-the-spot unmanned warehouse entry test; Confirm that the tool changing atmospheric pressure value is with the pressure tool changing, safe and reliable, especially under the railway station track, be with the pressure tool changing in the rich pigment soil sandy silt soil stratum constructing tunnel; Overcome rich water weak soil and be prone to the risk that quicksand caves in, guaranteed the operation security of top railway.
Description of drawings:
Fig. 1 is a Hangzhou Subway Line 1 tool changing ground plane sketch map in the specific embodiment of the invention.
Fig. 2 is a Hangzhou Subway Line 1 tool changing place surrounding environment floor map in the specific embodiment of the invention.
Mark among the figure: the 1-stabilization zone, 2-pastes Shahe.
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.
Rich pigment soil sandy silt soil stratum shield structure band presses the job practices of tool changing to be mainly used in rich pigment soil sandy silt soil stratum under the railway of the present invention station track, comprises the steps:
Preparation before A, the tool changing:
Adopt high-pressure rotary jet grouting pile that the tool changing place soil body is reinforced, to railway interests's detail knowledge railway main track settlement Control standard, like rail track protuberance amount≤2mm per hour; Settling amount≤4mm per hour; Whenever add up protuberance amount≤4mm round the clock; Whenever add up settling amount≤10mm round the clock; The two top-of-rail level discrepancy in elevation≤2mm; The accumulative total protuberance amount≤10mm of final circuit in half a year; Accumulative total sedimentation≤40mm.Whether the shield structure exists hole inspection to the face of land in the stabilization zone before arriving the tool changing zone, prevents that gas is overflowed and can't be pressurizeed from hole, if exist hole then to utilize cement mortar that hole is carried out shutoff in band pressure process; Feed back to shield structure measuring system through concrete measurement face of land tool changing mileage and confirm shield machine tool changing place, guarantee that shield structure shutdown tool change position is accurate.The driving attitude and the direction of adjustment shield machine are adjusted to normal range (NR) with the attitude and the tunneling direction of shield structure before shield machine arrives the tool changing place, guarantee that shield machine arrives the tool changing point smoothly.
Construction parameter adjustment behind B, the shield machine contact compacted soil:
The shield machine otch slowly reduces native storehouse pressure according to detection case after getting into compacted soil, and native storehouse pressure is not less than 1.5bar; Shield machine shield structure fltting speed is controlled in the 1cm/min; The cutter head of shield machine rotating speed is controlled at 1 rev/min; Shield machine shield tail oil fat is controlled at the 29-31kg/ ring.Preferably, shield tail oil fat is the 30kg/ ring.
C, pressure are annotated swell soil:
Shield structure soil injects swell soil in the storehouse, utilizes the slit of radial hole between fuselage and compacted soil of shield machine fuselage to carry out bentonitic pressure notes.
D, band are pressed tool changing:
At first confirm atmospheric pressure value, confirm tool changing atmospheric pressure value in the native storehouse according to the water and soil force value that calculates, concrete; Calculate the water and soil force value according to formula P=k0gh; The tool changing atmospheric pressure value is than the high 0.1～0.2bar of water and soil force value in the soil storehouse, and wherein P is the water and soil force value, and k0 is the side direction static balance pressure coefficient of soil; G is the weighted average severe of the soil body, and h is center, a tunnel buried depth.
P=k0gh=0.32*1.85*17.85*1000=1.05bar in the specific embodiment of the invention, atmospheric pressure value is initially set 1.2bar, carries out actual adjustment according to changing in ground settlement and the native storehouse afterwards.To compress into the storehouse be through air pressure opposing underground water soil pressure to band in rich pigment soil silty strata, stops underground water to flow to Tu Cang, with guarantee sandy soil from steady, prevent to cave in.Confirming of atmospheric pressure value to being with the safety of pressing in the tool changing construction to play important effect.
Then, bring down stocks to build pressure, export the dregs in the native storehouse to native storehouse topmost peep hole, be unearthed after the completion, survey situation in the native storehouse; Soil under all right situation, continues to be unearthed to 4-6cm place, people's lock below, 5cm place below preferred people's lock in the storehouse.Adopt respirator system to pressurize this moment, and the person of sending someone gets into people's lock and observes native storehouse environment; Be unearthed once more to the shield machine middle part, personnel get into tool changing, and shield machine recovers the headwork state after the tool changing.Tool changing requires to tear one open, adorns one.The principle of cutter changing is easy first and difficult later, and disassembling bolts and fastening employing pneumatic impact wrench are guaranteed the cutter installation quality.The plus-minus pressure-controlled must have the professional to operate, and carries out operation in strict accordance with " 0.6～3.0kgf/cm2 tunnel hyperbar operation decompression table ".
The tool changing place is positioned at intensive below, railway station track; For guaranteeing railway and tool changing safety; In advance the tool changing place is reinforced, tool changing place soil stabilization adopts φ 600 high-pressure rotary jet grouting piles to reinforce in the said steps A, stake stake overlap joint 200mm; Cement mixing content is 35%, and cement 28d compressive strength is not less than 2.0Mpa; Reinforcement depth is below ground 25.45m, and face of land 3.45m does not reinforce, and promptly effective reinforcement depth is 22m, and reinforcing length is 37.2m, and the reinforcing width is 7.6m, guarantees railway security and tool changing safety.
Preferably; Adjust the driving attitude and the direction of shield machine in the said steps A before the shield machine arrival tool changing place; Shield machine arrives driving attitude and the direction that preceding 30 rings in tool changing place are checked a shield machine; Through preceding 15 rings the attitude and the tunneling direction of shield structure are adjusted to normal range (NR) (± 50mm scope), guarantee that shield machine arrives the tool changing point smoothly.This moment, cutter head of shield machine stretched out 5cm, prevented that shield structure stabilization zone driving is stuck.
Rich pigment soil sandy silt soil stratum shield structure band presses the tool changing construction to be the excessive risk operation under the railway station track, need before the construction to personnel check UP, machinery overhauls and all goods and materials need be reached the spot and capacity, and is special; The swell soil that uses among the said step C adopts thin mould degree sodium bentonite; And the bentonite slurry fit quality is than being swell soil: water=250kg:1000kg, and swell soil proportion is 1.2g/cm3, and swell soil viscosity is 35s; And need to mix in 24 hours in advance to make to ferment; Guarantee its good gas retaining, sealing property after injecting soil body, thereby prevent that gas is overflowed and can't be pressurizeed in band pressure process.
Further, swell soil adopts external pipe directly to press notes, presses the notes mode to have two kinds,
1) shift to an earlier date radial hole pressure notes in the 5 ring shields, set up shield body periphery mud film, swelling soil pressure notes are controlled according to pressure, after pressure is greater than 5bar, stops pressure and annotate; Perhaps
2) press the notes swell soil in the native storehouse, set up face mud film; Set up mud and constantly carry out dregs displacement in the native storehouse through conveying worm when unconcerned, the slag that goes out when the conveying worm soil outlet stops displacement when being swell soil; Per tour utilizes fresh bentonite slurry to carry out the unconcerned maintenance work of face mud, and maintenance adopts fresh swell soil to fill with Tu Cang.
Be that example briefly explains with the Hangzhou Subway Line 1 below, as depicted in figs. 1 and 2, interval tool changing place, Hangzhou Subway Line 1 Qiu Tao way station to station, station, city is positioned at the 11st station track, railway terminal, station, city, the 12nd station track (parking line; The ballast aggregate railway roadbed) between, distance is pasted Shahe 2 riverbank 25m, center, tunnel buried depth 17.7m; Tool changing stabilization zone 1 other about 25m scope is pastes Shahe 2; Engineering district superficial part underground water belongs to porosity diving type, main compose be stored in that upper layer is banketed and big layer silt, flour sand in, Source Of Supply is mainly Atmospheric precipitation and surface water; And being supply each other relation with river embankment, groundwater table is with seasonal variety.It is under the face of land about 0.50m that water level is superlatively descended in the place annual mean, and it is very abundant to reinforce the tool changing district water yield.It is sandy silt that this tunnel, zone passes through soil layer; The tunnel upper formation is miscellaneous fill, sandy silt, sandy silt folder flour sand; The understratum, tunnel is a silty clay, and the flour sand vibration is prone to liquefaction, and distortion is prone to cave in; Under groundwater effect, be prone to produce quicksand; Be with in this zone and press tool changing to have very big risk, adopted rich pigment soil sandy silt soil stratum shield structure band under the railway of the present invention station track to press the job practices of tool changing, shield machine is along the safety of confirming that good having guaranteed constructed in this zone; Overcome rich water weak soil and be prone to the risk that quicksand caves in, guaranteed the operation security of top railway.And because rich pigment soil sandy silt soil stratum railway station track is with the pressure tool changing down is that the whole nation is the first, and the successful implementation of the interval left and right sides of this engineering tape pressure tool changing has guaranteed railway and follow-up safety of passing through the stake of giving up, and has also filled up the blank of Hangzhou Subway construction simultaneously.
Combine accompanying drawing that embodiment of the present invention is described in detail above; But the present invention is not limited to above-mentioned embodiment; In the ken that those of ordinary skills possessed, can also make various variations, these variations all belong within protection scope of the present invention.
Claims (7)
1. rich pigment soil sandy silt soil stratum shield structure band is pressed the job practices of tool changing under the railway station track, it is characterized in that said method comprises the steps:
Preparation before A, the tool changing:
Adopt high-pressure rotary jet grouting pile that the tool changing place soil body is reinforced; Whether the face of land in the soil stabilization district is existed hole inspection, if exist hole then to utilize cement mortar that hole is carried out shutoff; Feed back to shield structure measuring system through concrete measurement face of land tool changing mileage and confirm shield machine tool changing place, the driving attitude and the direction of adjustment shield machine before shield machine arrives the tool changing place;
Construction parameter adjustment behind B, the shield machine contact compacted soil:
The shield machine otch slowly reduces native storehouse pressure according to detection case after getting into the soil stabilization district, and native storehouse pressure is not less than 1.5bar; Shield machine shield structure fltting speed is controlled in the 1cm/min; The cutter head of shield machine rotating speed is controlled at 1 rev/min; Shield machine shield tail oil fat is controlled at the 29-31kg/ ring;
C, pressure are annotated swell soil:
Shield structure soil injects swell soil in the storehouse, utilizes the slit of radial hole between fuselage and compacted soil of shield machine fuselage to carry out bentonitic pressure notes;
D, band are pressed tool changing:
Confirm atmospheric pressure value, confirm tool changing atmospheric pressure value in the native storehouse according to the water and soil force value that calculates;
Bring down stocks to build pressure, export the dregs in the native storehouse to native storehouse topmost peep hole, be unearthed after the completion, survey situation in the native storehouse; Soil under all right situation, continues to be unearthed to 4-6cm place, people's lock below in the storehouse, adopts respirator system to pressurize at this moment, and the person of sending someone entering people lock is observed native storehouse environment; Be unearthed once more to the shield machine middle part, personnel get into tool changing, and shield machine recovers the headwork state after the tool changing.
2. rich pigment soil sandy silt soil stratum shield structure band is pressed the job practices of tool changing under the railway according to claim 1 station track; It is characterized in that; Tool changing place soil stabilization adopts φ 600 high-pressure rotary jet grouting piles to reinforce in the said steps A; Stake stake overlap joint 200mm, cement mixing content is 35%, cement 28d compressive strength is not less than 2.0Mpa; Reinforcement depth is below ground 25.45m, and face of land 3.45m does not reinforce, and promptly effective reinforcement depth is 22m, and reinforcing length is 37.2m, and the reinforcing width is 7.6m.
3. rich pigment soil sandy silt soil stratum shield structure band is pressed the job practices of tool changing under the railway according to claim 1 station track; It is characterized in that; Shield machine arrives driving attitude and the direction that preceding 30 rings in tool changing place are checked a shield machine in the said steps A; Through preceding 15 rings the attitude and the tunneling direction of shield structure are adjusted to normal range (NR) (± 50mm scope), this moment, cutter head of shield machine stretched out 5cm.
4. rich pigment soil sandy silt soil stratum shield structure band is pressed the job practices of tool changing under the railway according to claim 1 station track, it is characterized in that shield machine shield tail oil fat is the 30kg/ ring among the said step B.
5. press the job practices of tool changing according to rich pigment soil sandy silt soil stratum shield structure band under each described railway station track of claim 1 to 4; It is characterized in that; The swell soil that uses among the said step C adopts thin mould degree sodium bentonite; And the bentonite slurry fit quality is than being swell soil: water=250kg:1000kg, and swell soil proportion is 1.2g/cm3, and swell soil viscosity is 35s.
6. rich pigment soil sandy silt soil stratum shield structure band is pressed the construction method of tool changing under the railway according to claim 5 station track, it is characterized in that bentonite adopts external pipe directly to carry out pressure injection, and the pressure injection mode has two kinds,
1) shift to an earlier date radial hole pressure notes in the 5 ring shields, set up shield body periphery mud film, swelling soil pressure notes are controlled according to pressure, after pressure is greater than 5bar, stops pressure and annotate; Perhaps
2) press the notes swell soil in the native storehouse, set up face mud film; Set up mud and constantly carry out dregs displacement in the native storehouse through conveying worm when unconcerned, the slag that goes out when the conveying worm soil outlet stops displacement when being swell soil; Per tour utilizes fresh bentonite slurry to carry out the unconcerned maintenance work of face mud, and maintenance adopts fresh swell soil to fill with Tu Cang.
7. rich pigment soil sandy silt soil stratum shield structure band is pressed the job practices of tool changing under the railway according to claim 1 station track, it is characterized in that, confirms that according to the water and soil force value that calculates native storehouse internal gas pressure value is specially among the said step D:
Calculate the water and soil force value according to formula P=k0gh, the tool changing atmospheric pressure value is than the high 0.1～0.2bar of water and soil force value in the native storehouse, and wherein P is the water and soil force value, and k0 is the side direction static balance pressure coefficient of soil, and g is the weighted average severe of the soil body, and h is center, a tunnel buried depth.
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| CN108756916A (en) * | 2018-06-12 | 2018-11-06 | 中铁隧道局集团有限公司 | High intensity basement rock protrusion stratum shield construction method |
| CN108756916B (en) * | 2018-06-12 | 2019-11-05 | 中铁隧道局集团有限公司 | High-intensitive basement rock protrusion stratum shield construction method |
| CN110397444A (en) * | 2019-08-19 | 2019-11-01 | 中铁十二局集团有限公司 | Shallow earthing upper-soft lower-hard ground shield machine opens a position the method for tool changing |
| CN113847042A (en) * | 2021-09-01 | 2021-12-28 | 宁波市轨道交通集团有限公司 | Construction method for side-penetrating high-voltage electric tower of subway shield tunnel |
| CN113847042B (en) * | 2021-09-01 | 2023-07-21 | 宁波市轨道交通集团有限公司 | Construction method for side-penetrating high-voltage electric tower of subway shield tunnel |
| CN114033402A (en) * | 2021-11-16 | 2022-02-11 | 中铁十二局集团有限公司 | Hard rock stratum shield tunneling machine cutter head repairing construction method |
| CN114412486A (en) * | 2021-12-22 | 2022-04-29 | 中国建筑第八工程局有限公司 | Construction Method of Shield Tunnel Belt Pressure Tool Change in High Water Pressure Composite Formation Crossing the River |
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