CN105134228A - Improved thick mud type tunneling construction method for shield tunneling machine - Google Patents
Improved thick mud type tunneling construction method for shield tunneling machine Download PDFInfo
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- CN105134228A CN105134228A CN201510547819.4A CN201510547819A CN105134228A CN 105134228 A CN105134228 A CN 105134228A CN 201510547819 A CN201510547819 A CN 201510547819A CN 105134228 A CN105134228 A CN 105134228A
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Abstract
The invention relates to an improved thick mud type tunneling construction method for a shield tunneling machine. According to the method, by generating high-fluidity and high-expansibility uniform liquid high-purity mud in an excavation chamber and doubling mixing power within a short period of time, tunneling speed is increased by three times compared with that of a single cutter adopted in the prior art; soil discharge inside and outside the machine is conducted intermittently through two soil discharge ports at different positions, overall soil discharge amount on the ground is reduced, propelling force is reduced, and the earth pressure of gap soil can be stabilized; the rate of accidents occurring often before during dredging is reduced to be zero by means of an automatic sucking device and a vacuum conveying device, and 2000 m ultra-long distance conveyance can be achieved without a relay pump; the automatic sucking device and the vacuum conveyance mud discharge mode are low in workload and high in safety performance and can help with forced ventilation inside a tunnel, and then damages caused by harmful gas such as gas in the tunnel are avoided.
Description
Technical field
The present invention relates to a kind of method for tunnel construction, especially a kind of modified form mud dense formula driving engineering method of shield machine (containing push-bench).
Background technology
At present, China's major part urban tunnel construction adopts earth pressure balanced shield, EPBS construction, this method is comparatively suitable for based on fine grained, water permeability is less and be easy to the stratum forming Plastic Flow state after disturbance, and cost also can cheap about 30% compared with Slurry Shield.But when when the interval most of paragraph of shield structure is fine grained soil layer there is the larger coarse sand of permeability and sand and gravel stratum in local, the paragraph of the large water permeability of earth pressure balanced shield, EPBS well can not keep the stable of excavation face, is easy to cause excavation face unstability to cave in and the accident such as surface subsidence.If because local segment drops out now large water permeability stratum and adopt Slurry Shield between the whole district, then construction costs can be caused significantly to rise.
Summary of the invention
The technical problem to be solved in the present invention is: the modified form mud dense formula driving engineering method proposing a kind of shield machine (containing push-bench).
The technical solution adopted in the present invention is: a kind of modified form dense mud formula driving engineering method of shield machine, comprises the following steps:
1) the mud centrifugal mixer device of type is also used in the head end equipment different driving of development machine; Described mud centrifugal mixer device comprises operator and crushing cutter;
2) mixing power that wing of operating rotates forward generation and crushing cutter wing reversely rotate Positive-Negative Action together with the mixing power that produces, produce strong W type whirlpool, and generation have the high-purity mud of mobility in digging bin; The high-purity mud of good fluidity can be generated in short time, be convenient to use vacuum transportation device to be discharged at short notice.The mud dense formula driving engineering method employing short time mixing power double method can realize driving speed and tunnel than the high speed of fast 3 times of past hilted broadsword tool type.
3) soil pressuring management: lower pressure limiting is ground water pressure+0.02MPa, upper pressure limiting is ground water pressure+0.06MPa; High-purity mud relies on the pressure differential of the 0.04MPa of upper pressure limiting and lower pressure limiting, first wave spoil disposal extrudes to cabin from the mud discharging mouth of multiple position when reaching upper pressure limiting, formed and soak into stream to tail sealing and surrounding formation, fill surrounding formations space in propelling construction, suppress domain to sink in advance;
4), after first wave spoil disposal completes, a rear ripple spoil disposal, by mud valve (10), is discharged to pressure within the scope of low pressure limit by pressure differential method;
5) utilize in two ripple spoil disposals the atmospheric pressure in digging bin to coordinate afterwards automatically to add inhale device on one side forced air while carry out suction mud with the suction of ground vacuum generating device.Utilize automatically add inhale device and pressing force with the use of method, even if the transporting velocity of casting movement also can keep the speed of 7.0m/s ~ 9.0m/s when long Distance geometry has difference of height, relay pump also can not be needed just to realize the extra long distance conveying of 2000m.
Further, the driving of operator of the present invention adopts periphery to drive or midway drive type, and direction of rotation is left-handed or dextrorotation; The driving of described crushing cutter adopts central axis to drive, and direction of rotation is left-handed or dextrorotation; Direction of rotation is different according to operation, can realize forward and reverse rotation.The shape of tool of described operator is wing for the retrogressing of tunneling direction, and the shape of tool of crushing cutter is that the advance of the outstanding 15 ° ~ 30 ° of bevels of stirring efficiency is wing; Described operator and crushing cutter composition retreat wing advance aerofoil profile W set of knives; Till the central axis of described operator extends to dividing plate below from front end; The corresponding central axis of different driving in machine arranges in the form of a ring, in the circumferential position of the power transmission shaft of operator 0.2 ~ 0.3 meter, side, multi-ply construction is formed at the central part of dividing plate via planetary gear, outer mandrel power transmission shaft in the form of a ring, with the outer mandrel power transmission shaft of ring-type for pedestal, use and operate different drive, and chord is coated to cover plate and wraps in inside; When multiple wings of crushing cutter rotate, outer mandrel power transmission shaft is arranged in a linear.
Further say, of the present invention automatically adding, inhales device and utilizes 2 ~ 3 interrupted air pressure per second automatically to drop into; Described high-purity mud is slump 28cm, proportion 1.8, viscosity 45sec.
Further say, the muddy water jet of operator inside of the present invention has installed non retern valve, can eject muddy water from center and the multiple point of circumferential position.
Further say, first wave spoil disposal of the present invention: by through inside and outside the dividing plate at crushing cutter rear and digging bin rear portion, form wide 20mm, long 200mm, the gap of closedown can be opened by hydraulic pressure, air pressure or spring; On this gap, road, symmetry installs 2 ~ 4 holes up and down; Digging bin pressure increase on pressure limiting time, first open the aperture on gap, development machine periphery high-purity mud discharged to shield tail space fast by pressure; Shield tail space the high-purity mud of discharging of being under pressure soak into stream pressure effect under, make mud all-around mobile from tube coupling (sheet) outer peripheral face, produce an osmotic flow, fill the space between the space of contingent surrounding formations in propelling construction or loose soil pressure instantaneously, suppress domain to sink in advance.
Further say, a ripple spoil disposal after the present invention: by the mud valve of diameter 300mm as opening, till making the pressure in digging bin be discharged to lower pressure limiting; The high-purity mud of discharging in digging bin is by storing up mud groove in mud valve arrival machine, then utilizes the suction of vacuum transportation device to suck air slurry conveyed by diameter 125mm and above little comb.Because be high-purity mud, even so long distance delivery also can not adhere to tube wall cause blocking, blocking obstacle rate is the structure of 0.00%.
The invention has the beneficial effects as follows:
The homogeneous liquid high-purity mud of golden ratio of the dense formula engineering method of applicable mud with high fluidity, high-expansion can be generated with the mud centrifugal mixer device of type in digging bin by different driving;
Different with the wing-like of cutter by direction of rotation, the cutter group arranged in a straight line of several functions is had to guarantee that the influence basin stirring W whirlpool reaches on the basis of 0.7m, inside and outside two-layer structure directly links, and stirring capacity (time proterties) can be made to obtain revolutionary lifting.
By the mud dense formula pusher of short time mixing power double method and mud dense formula extrusion or mud dense formula shield machine and the dense formula shield method of mud, driving speed can be realized and tunnel than the high speed of fast 3 times of past hilted broadsword tool type;
Carry out the mud dense formula pusher of casting inside and outside machine and mud dense formula extrusion or mud dense formula shield machine and the dense formula shield method of mud intermittently by the soil-discharging port of 2 positions, the total soil discharge quantity reducing ground, the soil pressure stabilization reducing propulsive force, space soil property can also be made can be realized;
By automatically adding the mud dense formula pusher and dense formula extrusion or mud dense formula shield machine and the dense formula shield method of mud of inhaling device and vacuum transportation device, accident rate recurrent during former dredge blockage can be reduced to 0, relay pump also can not be needed just to realize the extra long distance conveying of 2000m.Automatically add and inhale device and vacuum handling sludge discharge way not only workload is little, and safety is high, can drive forced ventilation in tunnel, stop the generation of the pernicious gas harm such as gas in tunnel.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the structural representation of shield machine of the present invention (containing push-bench);
Fig. 2 is the end view drawing of mud centrifugal mixer device;
In figure: 1, development machine; 2, operate; 3, central axis; 4, dividing plate; 5, crushing cutter; 6, mud centrifugal mixer device; 7, wall bar; 8, muddy water jet; 9, digging bin; 10, mud valve; 11, mud groove is stored up; 12, little comb; 13, vacuum transportation device; 14, suction device is automatically added.
Detailed description of the invention
The present invention is further detailed explanation with preferred embodiment by reference to the accompanying drawings now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present invention are described in a schematic way, and therefore it only shows the formation relevant with the present invention.
As shown in Figure 1-2, spoked cutter or hobboing cutter on the overlay of the front end circumferential position of development machine 1, claim this to be operator 2.Operator 2 central axis 3 extend to dividing plate 4 below from front end till.The corresponding central axis 3 of different driving in machine arranges in the form of a ring, in the circumferential position of the power transmission shaft of about the about 0.3 meter distance in operator 2 side, multi-ply construction is formed at the central part of dividing plate 4 via planetary gear, outer mandrel power transmission shaft design in the form of a ring, with the outer mandrel power transmission shaft of ring-type for pedestal, use and operate 2 different drive, chord is wanted to be coated to cover plate and is wrapped in inside, when multiple wings of the crushing cutter 5 that can take out rotate, outer mandrel power transmission shaft is arranged in a straight line for being designed to, large cutter on development machine 1, multiple wings of little cutter composition, the structure inlayed inside and outside multi-direction cutter group is formed, directly link for the purpose of the high speed of driving speed, stirring capacity (time proterties) is made to have revolutionary progress.
The driving of operator 2 adopts the driving or midway drive type in periphery, and drive periphery by motor M 1, periphery connects operator 2 by wall bar 7 again, and make operator 2 or to right rotation, rotary speed is 5 ~ 10rpm left, blade number is 4 ~ 6.The driving of crushing cutter 5 adopts centre-driven, and install planetary gear, drive power transmission shaft by motor M 2, and then crushing cutter 5 is rotated, rotary speed is 5 ~ 20rpm, and blade number is 4 ~ 8, also can left or to right rotation.Direction of rotation is different according to operation, can turn, also can turn round about to a direction.When these two kinds of cuttves rotate, direction of rotation is arranged to a positive and a negative usually, makes air motion produce W type whirlpool.Play a role together with periphery driving drives with central axis and make development machine 1 to comprise operator 2, the blade group of crushing cutter 5 is connected into internal layer and outer field structure directly links, and makes stirring capacity (time proterties) can obtain revolutionary lifting like this.
The basic function of operator 2 is cutting power and the stirring capacity of reply excavation face, and the shape of cutter is wing for the retrogressing of direction of propulsion.The muddy water jet 8 of 2 inside of operating has installed non retern valve, can eject muddy water from center and the multiple point of circumferential position.Near operator 2, the basic function of the crushing cutter 5 of about 0.7m place equipment is to provide stirring capacity, is used for smashing clay block and gravel.The shape of cutter is that the advance of the outstanding 15 ° ~ 30 ° of bevels of stirring efficiency is wing.On the pusher being equipped with these cutters, operator 2, crushing cutter 5 carry out positive and negative direction rotation simultaneously, because direction of rotation is different with the wing-like of cutter, the cutter group arranged in a straight line of several functions is had to guarantee that the influence basin stirring whirlpool reaches on the basis of 0.7m, inside and outside two-layer structure directly links, and makes stirring capacity (time proterties) obtain revolutionary lifting.
Here it is is equipped with and retreats the wing and to advance the mud dense formula pusher of mud centrifugal mixer device (6) of wing W set of knives and mud dense formula extrusion or mud dense formula shield machine and the dense formula shield method of mud on development machine.
On the development machine 1 of about total length 5.0m, from the front end of operator 2 to the dividing plate 4 after crushing cutter 5, size is about on the long position of 1m and produces cyclone continuously to form W type whirlpool, operator 2 cut the Powdered clay viscosifier blocking agent lower native sand and operator 2 front ends ejected add water mix after form mud.When digging amount reaches 1.0m3, inject about 30 ~ 50% this mud, 2 wings of operating rotate forward produced mixing power and rear crushing cutter 5 wing and reversely rotate and positive and negatively together with the mixing power that produces to operate simultaneously, stirring capacity is strengthened at double, strong W type whirlpool is produced continuously in digging bin 9, as long as only in short time (needing about 60 seconds in the past) of about 20 seconds, just can generate and there is high fluidity, the even aqueous high-purity mud (is past spoil disposal thing) of the golden ratio (slump 28cm proportion 1.8 viscosity 45sec) of high bloating tendency and applicable mud dense formula engineering method.Mud centrifugal mixer device 6 is arranged in a straight line for the set of knives of the difform wing composition of operator 2 on pusher, crushing cutter 5, the ectonexine structure that formation can directly link, make stirring capacity (time proterties) obtain revolutionary lifting, generate the high-purity mud for golden ratio necessary pressure balance during casting and vacuum handling at short notice.
Employ the mud dense formula pusher of short time mixing power double method and mud dense formula extrusion or mud dense formula shield machine and mud dense formula shield method can realize driving speed and tunnel than the high speed of fast 3 times of past hilted broadsword tool type.
The mud of the sand that operator 2 is cut and front end ejection stirs in digging bin 9 internal mix, the power that rotates forward of 2 wings (wingspread is about 20cm) of operating and crushing cutter 5) effect that is multiplied of counter-rotating power of wing (wingspread is about 10cm), create strong W type whirlpool, in the short time, just can generate the above-mentioned high-purity mud with good fluidity mentioned.
In soil pressuring management, lower pressure limiting is ground water pressure+0.02Mpa, and upper pressure limiting is ground water pressure+0.06Mpa.Upper limit pressure ratio can be made to stabilize the theoretical value of liquid engineering method by this engineering method taller.The spoil disposal of digging bin 9 have employed the pressure differential method not needing to force mud discharging device.First wave spoil disposal: by through inside and outside the dividing plate 4 at crushing cutter 5 rear and digging bin 9 rear portion, form wide 20mm, long 200mm, can be opened the gap of closedown by hydraulic pressure, air pressure or spring, on this gap, road, symmetry installs 2 ~ 4 holes up and down.Such equipment group can the pressure increase of digging bin 9 near pressure limiting time, first open the aperture on gap, development machine 1 periphery high-purity mud discharged to shield tail space fast by pressure.Shield tail space the high-purity mud of discharging of being under pressure soak into stream pressure effect under, more easily make mud all-around mobile from tube coupling (sheet) outer peripheral face, the osmotic flow that a scope is about 1.0m size can be produced, the space between the space of contingent surrounding formations in propelling construction or loose soil pressure can be filled instantaneously, suppress domain to sink in advance.
Utilize the effect of osmotic flow pressure, the soil accounting in total soil discharge quantity V about 10% directly can be fallen in subsurface processes, and need not be discharged on the ground.The shield tail space of amplitude 30 ~ 50mm can be made to be full of the spoil disposal (generally can only be full of 60%) of 120% simultaneously, can little by little will the frictional force produced during tube coupling be advanced to be reduced to about 70% (periphery opposing value R=0.01t/ ㎡) at leisure.
Mixing time (T) is shorter, and driving speed (V) is faster, and these two is inverse relation.The speed doublings time condensation method of the dense engineering method uniqueness of modified form mud can be set up with the formula of L/v=T.For example, the speed of driving speed from travel speed (advancing endless tube joint (sheet) to need the time of 100 ~ 120 minutes) speed-raising of J.S (jack speed) 30mm per minute to maximum 3 times, i.e. the high speed driving of the stroke (advancing endless tube joint (sheet) to need the time of 30 ~ 40 minutes) of 90mm per minute.Pusher 1 has the mud centrifugal mixer device 6 of long 1.0m, the set of knives of large cutter head small bit tool different blade contour composition is arranged in a straight line by the mode that ectonexine is nested, has many places spoil disposal function from inside to outside.To can dig at a high speed evolutionary control within the scope of the rate of load condensate of existing permission like this.
The mud dense formula pusher in shield tail space and mud dense formula extrusion or mud dense formula shield machine and the dense formula shield method of mud can be guaranteed like this by means of shortening mixing time to make driving speed high speed.
The advance aerofoil profile crushing cutter 5 that the retrogressing aerofoil profile being mainly used in cutting operator 2 on development machine 1 and rear are mainly used in stirring is arranged in a linear, guarantee the ectonexine nested designs having 0.7m spacing, these two kinds of cuttves are respectively by independently driving the revolving force producing both forward and reverse directions simultaneously, the mud centrifugal mixer device 6 that about 1.0m is long to dividing plate 4 from operator 2 front end comprising digging bin 9, produce violent W type whirlpool, spend the time of about 20 seconds by cut under soil together with mud mixture.Rely on excellent stirring capacity can generate the high-purity mud of the golden ratio (slump value 28cm, proportion 1.8, viscosity 45sec) playing mud dense formula engineering method effect to greatest extent.
High-purity mud relies on the pressure differential of the about 0.04Mpa of upper pressure limiting and lower pressure limiting, extrudes from the mud discharging mouth of multiple position when reaching upper pressure limiting to cabin, is formed to soak into stream to tail sealing and the motion of surrounding domain, can reduce by total soil discharge quantity of 10%.Second Wave spoil disposal: by subsequent diameter 300mm mud valve 10 as opening, till making the pressure in digging bin 9 be discharged to lower pressure limiting.The gravel of more than 50mm if had an appointment, carry out classification.The high-purity mud of discharging in digging bin 9 is arrived in machine by mud valve 10 to store up mud groove 11, then by little comb 12 more than diameter 125mm level, utilize the suction of vacuum transportation device 13 to suck air slurry conveyed.Because be high-purity mud, even so long distance delivery also can not adhere to tube wall cause blocking, it is the structure of the risk of blocking obstacle rate 0.00%.
Drainage rock method is the product of high-purity mud, in order to different objects, carries out casting inside and outside machine intermittently by the soil-discharging port of 2 positions, the soil pressure stabilization that the total soil discharge quantity being discharged to ground reduces, reduces propulsive force, can also make space soil property.
The sludge drainage system of modified form mud dense formula driving engineering method is that soil under cutting and the ratio of muddy water in development machine 1 front end according to 1:0.3 ~ 0.5 mix, with the wing Stirring to the right of operator 2, the air-flow of right rotation improves mobility, be uniformly mixed to anticlockwise at the wing of the rear of 0.7m equipment crushing cutter 5 simultaneously, anticlockwise air-flow is multiplied with the draught effect of right rotation, and mobility is improved further.Direction of rotation is on the contrary two-way, the wing of crushing cutter 5 can also corresponding soil property, external diameter increase and decrease in the scope of 8 wings from 4 wings, the shape of wing be by the complex of vertical tail, and front guide vane in other words Special body form, the shape of cutter head has fully taken into account soil condition, is equipped with and huge gravel can be cut in half, the sharp knife head of ball clay pulverizing and unit cutter head.
Air-flow in digging bin 9 flows by positive and negative simultaneously, produces high concentration in the W type whirlpool short time, high flowing, high specific gravity mud continuously, the size of clay block can also be made on average all to be in below 10mm, huge gravel is cut in half.
The high-purity mud of discharging in digging bin 9 does not need graded operation just by the suction pipe of diameter 125mm level, utilizes the atmospheric pressure in digging bin 9 to coordinate and automatically adds suction device 14 forced air while carry out suction mud with the suction of ground vacuum transportation device 13.The power output of this vacuum transportation device 13 has each rank of 37KW to 100KW.About suction pipe inside, the region air pressure at top 1/3rd accelerates feed status, and region, bottom 2/3rds relies on the pressing force of mud to guarantee high-speed mobile.
Whole process is first converted into the monomer that length is about 3m, set according to weight ratio W=66.3kg, automatically adding near intake, inhales device 14 and utilizes 2 ~ 3 interrupted air pressure per second automatically to drop into, be delivered to little comb 12 again, whole pipeline, the gentle swaging of high-purity mud become a similar sandwich type to accomplish to inhale mud casting.
Automatically adding suction device 14 is be made up of compressor, tracheae, electromagnetic valve, the comb of 3.0m length, hose coupling, gravimetry device.The automatic switch of Controlling solenoid valve is responsible for by gravimetry device.In weight ratio, the mud controlling monomer discharge can not exceed the device of suction.Utilize suction and pressing force with the use of method, even the transporting velocity of casting movement is when long Distance geometry has difference of height, also can keep the speed of 7.0m ~ 9.0m per second.
On this basis from excavation face to the casting of ground, in order to inside of making provision against emergencies there will be adhesion blocking, be equipped with the pressure differential casting method of the steel mud pipe 12 of low friction, can not produce completely gravel blocking or adhesion blocking situation.Automatically the sandwich type inhaling device 14 generation that adds of adding by connecting (diameter 125mm level) little comb 12 attracts method, the mud utilizing pusher 1 front position to be equipped with is separated mixing plant 6 to improve stirring capacity, make the high-purity mud syncretization of generation, reach 0.00% blocking obstacle rate.
This adds suction device 14 suction pipeline automatically can reduce to 0 by accident rate recurrent during former dredge blockage, has nothing to do in soil property, even if in the narrow pipe of medium caliber, relay pump also can not be needed just to realize the extra long distance conveying of 2000m.
Here it is is equipped with one-piece type stirring type pressure differential, automatically add the mud dense formula pusher of inhaling device vacuum transportation device and dense formula extrusion or mud dense formula shield machine and the dense formula shield method of mud.
The present invention can apply in daily tunnel construction, comprises shield-tunneling construction, shield structure and propelling construction or propelling construction.
The just the specific embodiment of the present invention described in above manual, various illustrating is not construed as limiting flesh and blood of the present invention, person of an ordinary skill in the technical field after having read manual can to before described detailed description of the invention make an amendment or be out of shape, and do not deviate from the spirit and scope of the invention.
Claims (6)
1. the modified form of a shield machine dense mud formula driving engineering method, is characterized in that comprising the following steps:
1) the mud centrifugal mixer device of type is also used in the head end equipment different driving of development machine; Described mud centrifugal mixer device comprises operator and crushing cutter;
2) mixing power that wing of operating rotates forward generation and crushing cutter wing reversely rotate Positive-Negative Action together with the mixing power that produces, produce strong W type whirlpool, and generation have the high-purity mud of mobility in digging bin;
3) soil pressuring management: lower pressure limiting is ground water pressure+0.02MPa, upper pressure limiting is ground water pressure+0.06MPa; High-purity mud relies on the pressure differential of the 0.04MPa of upper pressure limiting and lower pressure limiting, first wave spoil disposal extrudes to cabin from the mud discharging mouth of multiple position when reaching upper pressure limiting, formed and soak into stream to tail sealing and surrounding formation, fill surrounding formations space in propelling construction, suppress domain to sink in advance;
4), after first wave spoil disposal completes, a rear ripple spoil disposal, by mud valve (10), is discharged to pressure within the scope of low pressure limit by pressure differential method;
5) utilize in two ripple spoil disposals the atmospheric pressure in digging bin to coordinate afterwards automatically to add inhale device on one side forced air while carry out suction mud with the suction of ground vacuum generating device.
2. the modified form of a kind of shield machine as claimed in claim 1 dense mud formula driving engineering method, is characterized in that: the driving of described operator adopts periphery to drive or midway drive type, and direction of rotation is left-handed or dextrorotation; The driving of described crushing cutter adopts central axis to drive, and direction of rotation is left-handed or dextrorotation; The shape of tool of described operator is wing for the retrogressing of tunneling direction, and the shape of tool of crushing cutter is that the advance of the outstanding 15 ° ~ 30 ° of bevels of stirring efficiency is wing; Described operator and crushing cutter composition retreat wing advance aerofoil profile W set of knives; Till the central axis of described operator extends to dividing plate below from front end; The corresponding central axis of different driving in machine arranges in the form of a ring, in the circumferential position of the power transmission shaft of operator 0.2 ~ 0.3 meter, side, multi-ply construction is formed at the central part of dividing plate via planetary gear, outer mandrel power transmission shaft in the form of a ring, with the outer mandrel power transmission shaft of ring-type for pedestal, use and operate different drive, and chord is coated to cover plate and wraps in inside; When multiple wings of crushing cutter rotate, outer mandrel power transmission shaft is arranged in a linear.
3. the modified form of a kind of shield machine as claimed in claim 1 dense mud formula driving engineering method, is characterized in that: described automatically adding is inhaled device and utilized 2 ~ 3 interrupted air pressure per second automatically to drop into; Described high-purity mud is slump 28cm, proportion 1.8, viscosity 45sec.
4. the modified form of a kind of shield machine as claimed in claim 1 dense mud formula driving engineering method, is characterized in that: the muddy water jet of described operator inside has installed non retern valve, can eject muddy water from center and the multiple point of circumferential position.
5. the modified form of a kind of shield machine as claimed in claim 1 dense mud formula driving engineering method, it is characterized in that: first wave spoil disposal: by through inside and outside the dividing plate at crushing cutter rear and digging bin rear portion, form wide 20mm, long 200mm, the gap of closedown can be opened by hydraulic pressure, air pressure or spring; On this gap, road, symmetry installs 2 ~ 4 holes up and down; Digging bin pressure increase on pressure limiting time, first open the aperture on gap, development machine periphery high-purity mud discharged to shield tail space fast by pressure; Shield tail space the high-purity mud of discharging of being under pressure soak into stream pressure effect under, make mud all-around mobile from tube coupling (sheet) outer peripheral face, produce an osmotic flow, fill the space between the space of contingent surrounding formations in propelling construction or loose soil pressure instantaneously, suppress domain to sink in advance.
6. the modified form of a kind of shield machine as claimed in claim 1 dense mud formula driving engineering method, is characterized in that: a rear ripple spoil disposal: by the mud valve of diameter 300mm as opening, till making the pressure in digging bin be discharged to lower pressure limiting; The high-purity mud of discharging in digging bin is by storing up mud groove in mud valve arrival machine, then utilizes the suction of vacuum transportation device to suck air slurry conveyed by diameter 125mm and above little comb.
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| CN110195596A (en) * | 2019-06-03 | 2019-09-03 | 石家庄铁道大学 | A kind of model test earth pressure balanced push-bench analogy method and constructional device |
| CN110331986A (en) * | 2019-08-14 | 2019-10-15 | 江苏格睿特管网工程有限公司 | A kind of spoil disposal structure and engineering method for middle-size and small-size balancing earth-pressure shielding machine |
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| CN104695970A (en) * | 2014-08-04 | 2015-06-10 | 江苏锐成机械有限公司 | Mud concentration type shield tunneling construction method for shield tunneling machine |
| CN104265311A (en) * | 2014-09-20 | 2015-01-07 | 无锡市翱宇特新科技发展有限公司 | Soil stirring device for cutter head of shield tunneling machine |
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| CN109026153A (en) * | 2018-08-03 | 2018-12-18 | 中国电建集团铁路建设有限公司 | A kind of pre- prevention and control device of earth pressure balanced shield, EPBS gas |
| CN110195596A (en) * | 2019-06-03 | 2019-09-03 | 石家庄铁道大学 | A kind of model test earth pressure balanced push-bench analogy method and constructional device |
| CN110331986A (en) * | 2019-08-14 | 2019-10-15 | 江苏格睿特管网工程有限公司 | A kind of spoil disposal structure and engineering method for middle-size and small-size balancing earth-pressure shielding machine |
| CN110331986B (en) * | 2019-08-14 | 2020-02-14 | 江苏格睿特管网工程有限公司 | Mud discharging structure and construction method for small and medium-sized earth pressure balance shield machine |
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