CN105257309A - Tool changing construction method for in-chamber grouting of earth pressure balance shield machine in sand bed - Google Patents
Tool changing construction method for in-chamber grouting of earth pressure balance shield machine in sand bed Download PDFInfo
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Abstract
The invention provides a tool changing construction method for in-chamber grouting of an earth pressure balance shield machine in sand bed. The tool changing construction method comprises the following steps: step 1, injecting bentonite slurry into a soil chamber; step 2, replacing air with muck slurry in the soil chamber; step 3, performing pressurized gap filling; step 4, backfilling the soil chamber; step 5, cleaning the chamber and exchanging tools; step 6, recovering tunneling. The tool changing construction method is used for chamber filling tool exchanging of the earth pressure balance shield machine in sand bed without ground reinforcing conditions, avoids difficult advanced grouting construction operation, makes clear the grouting construction operation mode, prevents cement mortar in a screw conveyor from being hardened to cause equipment damages, effectively reduces the construction operation workload, and is short in construction time and high in efficiency and safety.
Description
Technical field
The present invention relates to a kind of construction method of construction of tunnel technical field, particularly, relate to the construction method of slip casting tool changing in balancing earth-pressure shielding machine storehouse in a kind of layer of sand.
Background technology
In recent years, along with the continuous propelling of Urbanization Process In China, the congestion problems of urban traffic is also more and more serious.The construction of subway tunnel can solve or improve urban traffic present situation, is therefore widely used.These subway tunnels need to build by shield method.Earth pressure balanced shield, EPBS method is the full mechanical execution method of one conventional in shield construction, it adopts balancing earth-pressure shielding machine, by the knife cutting soil body in shield machine front, and quarrel soil is transferred out outside tunnel by conveying worm, advance under the supporting of shield machine shell-and-tube sheet outside.In shield driving process, need constantly to cut ground, when cut be competent bed time, cutter can produce excessive wear, burst and the destruction cutter head structure such as stuck, affects normal construction operation, need change cutter in time.Geological conditions residing for each city and the difference of surrounding environment, need to carry out shield machine cutter replacing under various geological conditions.After traditional normal pressure tool changing method, tool changing method with pressure and ground reinforce, tool changing method is widely applied in Analysis on Shield Tunnel Driven Process.But be in layer of sand when shield machine, shield machine excavation face upper base cannot carry out strengthening construction operation, and layer of sand self-stable ability is poor, when leaking gas serious, shield machine cutter is changed to construct still exists many-sided technical difficulty and serious potential safety hazard.Traditional shield machine cutter is changed construction method and is difficult to adopt without ground condition of reinforcing in layer of sand, produces shield machine tool changing difficulty, the unfavorable situation that efficiency of construction is low, long in time limit.
Through finding the literature search of prior art, patent of invention " [application number is 201210268682.5]; denomination of invention: the construction method of rich pigment soil sandy silt soil stratum shield structure tool changing with pressure under railway station track ", above-mentioned patent shield machine tool changing construction needs to adopt high-pressure rotary jet grouting pile to reinforce the tool changing place soil body, applies under without ground reinforcing condition and is restricted.Patent of invention " [application number is 201010554969.5]; denomination of invention: a kind of method for exchanging tool of shield machine for tunnel construction ", although this patent proposes and utilizes the filling system of shield machine to carry out Tu Cang displacement at native storehouse upper wall grouting port to fill, constructing operation method is filled in not mentioned concrete displacement filling mode and concrete displacement.This patent cementing mortar in native storehouse synchronously carries out with output dregs, adopts cement mortar to replace in native storehouse in dregs process, cannot prevent the cement mortar in conveying worm from hardening, cause damage of facilities.This patent adopts the pre-grouting reinforcing shield machine top soil body, but pre-grouting complex procedures, operating difficulties, speed of application is slow.Therefore need badly a kind of without balancing earth-pressure shielding machine tool changing construction method quick, safe in layer of sand under ground reinforcing condition.
Summary of the invention
For defect of the prior art, the object of this invention is to provide the construction method of slip casting tool changing in balancing earth-pressure shielding machine storehouse in a kind of layer of sand, overcome that ground in prior art cannot reinforce, layer of sand protect gas ability, grouting port easily blocks, mortar depositing construction operating type is indefinite, pre-grouting strengthening construction difficulty and the shortcoming and defect such as workload is large, the safe tool changing realized without balancing earth-pressure shielding machine under ground reinforcing condition in layer of sand is constructed.
For realizing above object, the invention provides the construction method of slip casting tool changing in balancing earth-pressure shielding machine storehouse in a kind of layer of sand, described construction method comprises the steps:
Note bentonite slurry in the first step, Xiang Tucang:
Inject bentonite slurry by the ball valve being positioned at 3 positions and 12 positions in native storehouse to native storehouse, bentonite slurry injection rate be native warehouse long-pending 10% ~ 15%;
Dregs mud in second step, air displacement soil storehouse:
Rotation conveying worm exports the dregs mud in native storehouse, until dregs mud is discharged completely, namely conveying worm no longer exports dregs mud; Export in dregs sludge process, to keep in native storehouse pressure stability in the first setting value;
3rd step, filling space with pressure:
In soil storehouse, pressure remains on described first setting value, with cotton-wool by the gap jam-pack between cutterhead otch ring place's anterior shield and the soil body, and adopts leak stopping spirit to carry out shutoff;
4th step, backfill storehouse:
(1) be connected in native storehouse by mini-valve tube by the ball valve on native bulkhead, the layout of each ball valve and mini-valve tube is as follows: 12 position ball valve cementing mortars; 10 position ball valves connect mini-valve tube, and mini-valve tube is fixed on 11 positions and 12 position hangers, cement injection; 2 position ball valves are for checking the slip casting situation of 10 position ball valves;
(2) cementing mortar: cement mortar is annotated in native storehouse from 12 position ball valves; Open 3 positions and 9 position ball valve slow releasing air, until discharge cement mortar simultaneously; Close 3 positions and 9 position ball valves, continue filled with water cement mortar, adopt 1 position ball valve slow releasing air; With in cement mortar displaced air process, pressure in native storehouse is remained on the second setting value, after cement mortar fills up Tu Cang, stop cementing mortar, close 1 position ball valve; Fill out in cement mortar process the conveying worm that reverses after certain interval of time, prevent conveying worm stuck;
(3) cement injection: after the cement mortar initial set of injecting in native storehouse, from 10 position ball valves to native storehouse filled with water mud; In cement injection process, open people's lock relief hole, air in slow releasing storehouse; After 2 position ball valves flow out cement paste, stop cement injection;
5th step, bring down stocks tool changing:
After backfill storehouse completes the 24th hour starts, judge slurries set strength in native storehouse every 2 hours by people's lock relief hole place, treat grout cures in native storehouse, cut the cement mortar and cement paste of solidifying with pneumatic pick from lower to upper, Tu Cang is cleaned out, now not chisel dish opening; Ensure cutterhead face integrality and carry out cutter changing from the bottom up, firmly table top being installed during tool changing, taking bolt and self-locking nut apart, remove old cutter, more renew cutter, bolt on;
6th step, recovery driving:
After cutter changing whole on cutter head of shield machine completes, shield machine recovers driving.
Preferably, in the first step, described bentonite slurry is chemical slurry, and material with slurry is calcium-base bentonite and water, and the volume ratio of calcium-base bentonite and water is 1:3.
Preferably, in the first step, described some position is the orientation that on clock face scale, hour hands point to.
Preferably, in the first step, described ball valve is that spheroid opening and closing element is driven by valve rod, and around the valve that ball valve axis rotates.
Preferably, in the 3rd step, described cutterhead otch ring is be positioned at the circulus of the most front section of shield machine with cutting edge, plays excavation and the effect of gear soil.
Preferably, in the 3rd step, it is anterior that described anterior shield is positioned at shield structure, and be cylindrical shape steel work, its inside is provided with for supporting cutterhead main drive and conveying worm.
Preferably, in the 3rd step, described leak stopping spirit is a kind of cement admixture of fast blockage, has rapid hardening, early strong, impervious, microdilatancy, nontoxic feature.
Preferably, in the 4th step (1), described mini-valve tube be a kind of can only to pulp outside pipe, the unidirectional closing device that can not return slurry in pipe, it is made up of pipe, rubber case, sealing ring in PVC outer tube, 6 points of zinc-plated slip castings.
Preferably, in the 4th step (1), the quality mixture ratio of described cement mortar is cement: sand: water=1:a:b, wherein: 0.5≤a≤1.5, and 1≤b≤2.
Preferably, in the 4th step (1), the quality mixture ratio of described cement paste is cement: water=1:1.
Preferably, in the 4th step (3), described people's lock relief hole is can according to the valve of pressure size opening and closing, and it is arranged in the top of native storehouse dividing plate.
Preferably, in the 5th step, if any leaking in exchanging knives process, cotton-wool and leak stopping spirit is adopted to carry out shutoff.
Preferably, in the 5th step, described cutterhead opening is eating dishes without rice or wine on cutterhead, cuts dregs chip removal for realizing.
Preferably, in the 5th step, described self-locking nut is the nut of a kind of frictionally self-locking anti-loosing, vibrationproof.
Preferably, in second step and the 3rd step: in the native storehouse of described maintenance, pressure stability is in the first setting value, and the first setting value is 0.06MPa.
Preferably, in the 4th step: described pressure in native storehouse is remained on the second setting value, the second setting value is 0.06 ~ 0.07MPa.
Compared with prior art, the present invention has following beneficial effect:
The present invention is directed in layer of sand and to fill in barn tool changing problem without balancing earth-pressure shielding machine under ground reinforcing condition, a kind of being applicable to is provided in layer of sand, to carry out the construction method without slip casting tool changing in the balancing earth-pressure shielding machine storehouse under ground reinforcing condition, compare existing patented technology, avoid the pre-grouting construction operation of difficulty, specify that mortar depositing construction operating type, prevent the cement mortar in conveying worm to harden and cause damage of facilities, effectively reduce construction operation amount; Engineering time of the present invention is short, and efficiency is high, high safety.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the balancing earth-pressure shielding machine schematic diagram in the output dregs sludge process in the embodiment of the present invention;
Fig. 2 is that in the cement mortar displacement step in the embodiment of the present invention, ball valve and mini-valve tube arrange schematic diagram;
Fig. 3 is the cutterhead aperture position schematic diagram in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
As Figure 1-3, the present embodiment provides the construction method of slip casting tool changing in balancing earth-pressure shielding machine storehouse in a kind of layer of sand, for tunnel, Guangzhou; Bottom cutter head of shield machine, the degree of depth is underground 14m; stop position upper base is intersection; for prevent because of cutter excessive wear, burst and destroy cutter head structure with stuck etc.; affect normal construction operation; the construction method of tool changing of filling in barn need be adopted; ensure that tool changing construction safety carries out effectively, Specific construction step is summarized as follows:
The first step, construction field geology are investigated:
Determine that bottom cutter head of shield machine, 6m below present position is to the distribution of strata situation of upper base by consulting geologic prospect report; Investigation cutter head of shield machine upper base situation (namely 45 ° of oblique lines pass to earth's surface scope top existing building or structure condition from cutter head of shield machine bottom surface), has determined whether that ground reinforces condition;
The plain fill layer of the argillic horizon of 6m below present position to the distribution of strata of upper base to be thickness be 5m bottom the present embodiment cutter head of shield machine, thickness to be the layer of sand of 10.5m and thickness be 4.5m, cutter head of shield machine is in layer of sand; The transmission coefficient of argillic horizon is 1.5m/d, and the transmission coefficient of layer of sand is 10m/d; The transmission coefficient of plain fill layer is 0.4m/d.Shield machine upper base is intersection, reinforces condition without ground.
Second step, determine cutter replacing method:
Determine that shield machine is arranged in layer of sand, and reinforce condition without ground, can not carry out normal pressure tool changing to shield machine under this condition, layer of sand protects gas ability simultaneously, can not carry out tool changing with pressure in layer of sand.So determine the construction method adopting slip casting tool changing in balancing earth-pressure shielding machine storehouse in layer of sand.
Note bentonite slurry in 3rd step, Xiang Tucang:
Inject bentonite slurry by the ball valve being positioned at 3 positions and 12 positions in native storehouse to native storehouse, bentonite slurry injection rate be native warehouse long-pending 15%, i.e. 4.5m
3.
4th step, the dregs mud in air displacement soil storehouse
Rotation conveying worm exports the dregs mud in native storehouse, until dregs mud is discharged completely, namely conveying worm no longer exports dregs mud; Export in dregs sludge process, keep pressure stability in native storehouse at 0.06MPa, to export dregs sludge process as shown in Figure 1.
5th step, filling space with pressure:
In soil storehouse, pressure remains on 0.06MPa, with cotton-wool by the gap jam-pack between cutterhead otch ring place's anterior shield and the soil body, and adopts leak stopping spirit to carry out shutoff.
6th step, backfill storehouse, concrete:
(1) be connected in native storehouse by mini-valve tube by the ball valve on native bulkhead, the layout of each ball valve and mini-valve tube is as follows: 12 position ball valve cementing mortars; 10 position ball valves connect mini-valve tube, and mini-valve tube is fixed on 11 positions and 12 position hangers, cement injection; 2 position ball valves are for checking the slip casting situation of 10 position ball valves; The layout of ball valve and mini-valve tube as shown in Figure 2.
(2) cementing mortar: cement mortar medium sand is 0.75 with cement quality than a value, water is 1.18 with cement quality than b value, cement mortar is annotated in native storehouse from 12 position ball valves; Open 3 positions and 9 position ball valve slow releasing air, until discharge cement mortar simultaneously; Close 3 positions and 9 position ball valves, continue filled with water cement mortar, adopt 1 position ball valve slow releasing air; With in cement mortar displaced air process, pressure in native storehouse is remained on 0.06MPa, after cement mortar fills up Tu Cang, stop cementing mortar, close 1 position ball valve; Fill out the 20 minutes reversion conveying worms in interval in cement mortar process, prevent conveying worm stuck.
(3) cement injection: the cement mortar injected in native storehouse completes initial set after 4 hours, from 10 position ball valves to native storehouse filled with water mud; In cement injection process, open people's lock relief hole, air in slow releasing storehouse; After 2 position ball valves flow out cement paste, stop cement injection.
7th step, bring down stocks tool changing:
After backfill storehouse completes the 24th hour starts, and rushed down pressure hole place every two hours by people's lock and judge slurries set strength in native storehouse, after backfill storehouse completes 72 hours, in native storehouse, slurries solidify completely; Cut the cement mortar and cement paste of solidifying with pneumatic pick from lower to upper, Tu Cang is cleaned out, now not chisel dish opening; Ensure cutterhead face integrality and carry out cutter changing from the bottom up, firmly table top being installed during tool changing, taking bolt and self-locking nut apart, remove old cutter, more renew cutter, bolt on.When changing upper knife, bottom has finished changing cutter place has water droplet to ooze out, and after adopting cotton-wool to block gap, lower tool rises, adopt leak stopping spirit to carry out shutoff, stagnant water effect is good.Bring down stocks in exchanging knives process, face is stablized, without water level rise phenomenon.Cutterhead opening is eating dishes without rice or wine on cutterhead, and cut dregs chip removal for realizing, its position as shown in Figure 3.
8th step, recovery driving:
After on cutter head of shield machine, whole cutter changing completes, preliminary operation conveying worm, conveying worm normal operation, shield machine recovers driving.
The present invention is directed in layer of sand and to fill in barn tool changing problem without balancing earth-pressure shielding machine under ground reinforcing condition, a kind of being applicable to is provided in layer of sand, to carry out the construction method without slip casting tool changing in the balancing earth-pressure shielding machine storehouse under ground reinforcing condition, compare existing patented technology, this method avoid the pre-grouting construction operation of difficulty, specify that mortar depositing construction operating type, prevent the cement mortar in conveying worm to harden and cause damage of facilities, effectively reduce construction operation amount; Engineering time of the present invention is short, and efficiency is high, high safety.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (10)
1. a construction method for slip casting tool changing in balancing earth-pressure shielding machine storehouse in layer of sand, is characterized in that, described construction method comprises the steps:
Note bentonite slurry in the first step, Xiang Tucang:
Inject bentonite slurry by the ball valve being positioned at 3 positions and 12 positions in native storehouse to native storehouse, bentonite slurry injection rate be native warehouse long-pending 10% ~ 15%;
Dregs mud in second step, air displacement soil storehouse:
Rotation conveying worm exports the dregs mud in native storehouse, until dregs mud is discharged completely, namely conveying worm no longer exports dregs mud; Export in dregs sludge process, to keep in native storehouse pressure stability in the first setting value;
3rd step, filling space with pressure:
In soil storehouse, pressure remains on described first setting value, with cotton-wool by the gap jam-pack between cutterhead otch ring place's anterior shield and the soil body, and adopts leak stopping spirit to carry out shutoff;
4th step, backfill storehouse:
(1) be connected in native storehouse by mini-valve tube by the ball valve on native bulkhead, the layout of each ball valve and mini-valve tube is as follows: 12 position ball valve cementing mortars; 10 position ball valves connect mini-valve tube, and mini-valve tube is fixed on 11 positions and 12 position hangers, cement injection; 2 position ball valves are for checking the slip casting situation of 10 position ball valves;
(2) cementing mortar: cement mortar is annotated in native storehouse from 12 position ball valves; Open 3 positions and 9 position ball valve slow releasing air, until discharge cement mortar simultaneously; Close 3 positions and 9 position ball valves, continue filled with water cement mortar, adopt 1 position ball valve slow releasing air; With in cement mortar displaced air process, pressure in native storehouse is remained on the second setting value, after cement mortar fills up Tu Cang, stop cementing mortar, close 1 position ball valve; Fill out in cement mortar process the conveying worm that reverses after certain interval of time, prevent conveying worm stuck;
(3) cement injection: after the cement mortar initial set of injecting in native storehouse, from 10 position ball valves to native storehouse filled with water mud; In cement injection process, open people's lock relief hole, air in slow releasing storehouse; After 2 position ball valves flow out cement paste, stop cement injection;
5th step, bring down stocks tool changing:
After backfill storehouse completes the 24th hour starts, after 2 hours, judge slurries set strength in native storehouse by people's lock relief hole place, after grout cures in native storehouse, cut the cement mortar and cement paste of solidifying from lower to upper with pneumatic pick, Tu Cang is cleaned out, now not chisel dish opening; Ensure cutterhead face integrality and carry out cutter changing from the bottom up, firmly table top being installed during tool changing, taking bolt and self-locking nut apart, remove old cutter, more renew cutter, bolt on;
6th step, recovery driving:
After cutter changing whole on cutter head of shield machine completes, shield machine recovers driving.
2. the construction method of slip casting tool changing in balancing earth-pressure shielding machine storehouse in a kind of layer of sand according to claim 1, it is characterized in that, in the first step, described bentonite slurry is chemical slurry, material with slurry is calcium-base bentonite and water, and the volume ratio of calcium-base bentonite and water is 1:3.
3. the construction method of slip casting tool changing in balancing earth-pressure shielding machine storehouse in a kind of layer of sand according to claim 1, is characterized in that, in the first step:
Described some position is the orientation that on clock face scale, hour hands point to;
Described ball valve is that spheroid opening and closing element is driven by valve rod, and around the valve that ball valve axis rotates.
4. the construction method of slip casting tool changing in balancing earth-pressure shielding machine storehouse in a kind of layer of sand according to claim 1, is characterized in that, in the 3rd step:
Described cutterhead otch ring is be positioned at the circulus of the most front section of shield machine with cutting edge;
It is anterior that described anterior shield is positioned at shield structure, and be cylindrical shape steel work, its inside is provided with for supporting cutterhead main drive and conveying worm.
5. the construction method of slip casting tool changing in balancing earth-pressure shielding machine storehouse in a kind of layer of sand according to claim 1, is characterized in that, in the 4th step (1):
The quality mixture ratio of described cement mortar is cement: sand: water=1:a:b, wherein: 0.5≤a≤1.5, and 1≤b≤2;
The quality mixture ratio of described cement paste is cement: water=1:1.
6. the construction method of slip casting tool changing in balancing earth-pressure shielding machine storehouse in a kind of layer of sand according to claim 1, it is characterized in that, in 4th step (1), described mini-valve tube be a kind of can only to pulp outside pipe, the unidirectional closing device that can not return slurry in pipe, it is made up of pipe, rubber case, sealing ring in PVC outer tube, 6 points of zinc-plated slip castings.
7. the construction method of slip casting tool changing in balancing earth-pressure shielding machine storehouse in a kind of layer of sand according to claim 1, it is characterized in that, in 4th step (3), described people's lock relief hole is can according to the valve of pressure size opening and closing, and it is arranged in the top of native storehouse dividing plate.
8. the construction method of slip casting tool changing in balancing earth-pressure shielding machine storehouse in a kind of layer of sand according to claim 1, is characterized in that, in the 5th step, if any leaking in exchanging knives process, adopts cotton-wool and leak stopping spirit to carry out shutoff.
9. the construction method of slip casting tool changing in balancing earth-pressure shielding machine storehouse in a kind of layer of sand according to claim 1, is characterized in that, in the 5th step, described cutterhead opening is eating dishes without rice or wine on cutterhead, cuts dregs chip removal for realizing; In 5th step, described self-locking nut is the nut of a kind of frictionally self-locking anti-loosing, vibrationproof.
10. the construction method of slip casting tool changing in balancing earth-pressure shielding machine storehouse in a kind of layer of sand according to claim 1, is characterized in that, in second step and the 3rd step: in the native storehouse of described maintenance, pressure stability is in the first setting value, and the first setting value is 0.06MPa;
In 4th step: described pressure in native storehouse is remained on the second setting value, the second setting value is 0.06 ~ 0.07MPa.
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| CN201510730729.9A CN105257309B (en) | 2015-10-30 | 2015-10-30 | In a kind of layer of sand in balancing earth-pressure shielding machine storehouse slip casting tool changing construction method |
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| CN201510730729.9A CN105257309B (en) | 2015-10-30 | 2015-10-30 | In a kind of layer of sand in balancing earth-pressure shielding machine storehouse slip casting tool changing construction method |
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| CN105952461A (en) * | 2016-06-17 | 2016-09-21 | 西南交通大学 | Testing apparatus and testing method for simulating improvement of residue earth during earth pressure balance shield construction |
| CN106837360A (en) * | 2017-02-13 | 2017-06-13 | 中铁十九局集团轨道交通工程有限公司 | Upper-soft lower-hard ground shield machine open a position tool changing when mud film construct mechanism and construction method |
| CN108266195A (en) * | 2018-01-11 | 2018-07-10 | 中铁工程装备集团机电工程有限公司 | A kind of shield machine soil storehouse ball valve slag cleaning device |
| CN111742626A (en) * | 2020-07-10 | 2020-10-09 | 赵小英 | Municipal works underground soil layer equipment of changing soil |
| CN108571327B (en) * | 2018-05-16 | 2023-11-17 | 华东交通大学 | Rapid compensation device for dregs in shield machine soil cabin and working method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106837360A (en) * | 2017-02-13 | 2017-06-13 | 中铁十九局集团轨道交通工程有限公司 | Upper-soft lower-hard ground shield machine open a position tool changing when mud film construct mechanism and construction method |
| CN108266195A (en) * | 2018-01-11 | 2018-07-10 | 中铁工程装备集团机电工程有限公司 | A kind of shield machine soil storehouse ball valve slag cleaning device |
| CN108571327B (en) * | 2018-05-16 | 2023-11-17 | 华东交通大学 | Rapid compensation device for dregs in shield machine soil cabin and working method thereof |
| CN111742626A (en) * | 2020-07-10 | 2020-10-09 | 赵小英 | Municipal works underground soil layer equipment of changing soil |
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|---|---|
| CN105257309B (en) | 2018-02-09 |
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