CN108104824A - A kind of Soft Soil Area slurry shield passes through existing constructing metro tunnel method - Google Patents

A kind of Soft Soil Area slurry shield passes through existing constructing metro tunnel method Download PDF

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Publication number
CN108104824A
CN108104824A CN201711145032.0A CN201711145032A CN108104824A CN 108104824 A CN108104824 A CN 108104824A CN 201711145032 A CN201711145032 A CN 201711145032A CN 108104824 A CN108104824 A CN 108104824A
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CN
China
Prior art keywords
grouting
slip casting
hole
tunnel
shield
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CN201711145032.0A
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Chinese (zh)
Inventor
丁智
费豪
张霄
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Zhejiang University City College ZUCC
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Zhejiang University City College ZUCC
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Application filed by Zhejiang University City College ZUCC filed Critical Zhejiang University City College ZUCC
Priority to CN201711145032.0A priority Critical patent/CN108104824A/en
Publication of CN108104824A publication Critical patent/CN108104824A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
    • E21D9/0607Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
    • E21D9/08Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield

Abstract

The present invention relates to a kind of Soft Soil Area slurry shields to pass through existing constructing metro tunnel method, it including preparation of construction, test section working measure, passes through preceding working measure, through section working measure and passes through rear working measure, wherein passing through rear working measure includes subway tunnel micro-destabilization slip-casting and slurry shield tunnel secondary grouting.The beneficial effects of the invention are as follows:The present invention can make slurry shield, and smoothly safety passes through existing subway tunnel, and can be good at controlling the deformation of existing subway and the neighbouring soil body, ensures the normal operation of existing subway;The present invention can be good at adaptation Soft Soil Area slurry shield and pass through the environment of existing subway, while can play the role of integer support well, can guarantee construction quality, ensure the successive projects construction of slurry shield, and application prospect is good.

Description

A kind of Soft Soil Area slurry shield passes through existing constructing metro tunnel method
Technical field
The present invention relates to the construction fields that slurry shield passes through existing subway, and in particular to slurry shield passes through existing subway Construction technology and deformation control method.
Background technology
Shield construction is applied since the interference effect from extraneous factors such as season, weather conditions and speed of application are fast The features such as worker person is few, and construction precision is high, it is shown that great superiority.Particularly slurry balance shield construction is suitable for various Complicated geological environment, is widely used in the tunnel construction of city underground engineering.In slurry shield work progress In, can there is a situation where to pass through existing tunnel, especially pass through existing operated subway.It is inevitable when passing through existing operated subway Ground has an impact existing operated subway and the periphery soil body.If this influence crosses senior general and causes existing operated subway and the periphery soil body Generation moderate finite deformation, in some instances it may even be possible to occur stratum collapse and the destruction of existing operated subway, so as to cause great peace occurs Full accident.Therefore, in order to reduce the influence that Soft Soil Area slurry shield is constructed to existing operated subway, it is ensured that the safety of construction, it must Effective construction technology and method must be formulated, rational slurry shield construction parameter is set, so as to which surrounding enviroment is controlled to influence.
The content of the invention
The purpose of the present invention is overcoming deficiency of the prior art, a kind of Soft Soil Area slurry shield is provided and passes through existing subway Method for tunnel construction.The purpose of the present invention is what is be achieved through the following technical solutions:
This Soft Soil Area slurry shield passes through existing constructing metro tunnel method, including subway tunnel micro-destabilization slip-casting and mud Water shield tunnel secondary grouting, comprises the following steps:
The construction procedure of subway tunnel micro-destabilization slip-casting:
1) setting-out:It drills on track both sides on the calibrated bolck section of jurisdiction of lower sleeping soil layer and arch bottom section of jurisdiction, then Hole position locating piece is processed, confirms sampling point before drilling;
2) drilling machine positions:It is drilled using electric hammer drill and setscrew is installed, hole-drilling system, and boring positioning are installed;Perforate: Perforate is carried out using hole-drilling system, hole-drilling system posture is adjusted before perforate;Mounting hole pipe:It is cleared up after pore-forming, pours into plant Muscle glue is connected using seamless steel pipe as orifice tube with section of jurisdiction;
3) ball valve is connected with orifice tube, when slip casting installs blowout hookup on ball valve;Tube wall is drilled with electric hammer drill;
4) slip casting core pipe uses the seamless steel pipe of silk mouth connection, and during construction, slip casting core pipe end is using enamel-cover cloth package;Root According to each slip casting depth, Grouting Pipe is set by underground layer by root by blowout hookup, ball valve and orifice tube;
5) dual slurry grouting pump, flow instrument, mixer and Grouting Pipe are connected by grouting pipeline;Slurry system is mixed with small-sized By 0.6~0.8 mixing cement mortar of the ratio of mud;Slip casting is carried out using double pump two fluid grouting method, side is starched using tube drawing apparatus marginal not Tube drawing, pipe-pulling speed match with flow rate of grouting, slip casting single-unit height, grouting amount;
It determines as the following formula:
Wherein, v-pipe-pulling speed/cm/min;L-single slip casting length/cm;V-single grouting amount/L;Q-dual slurry Flow/L/min;
6) slip casting is completed on request, after slurries initial set, is all pulled out Grouting Pipe using tube drawing apparatus;Close ball valve, Blowout hookup is removed, single slip casting is completed;
7) slip casting is repeated:It repeats to construct by step 5)~step 6), until reaching whole hole condition;After reaching whole hole condition, Ball valve is removed, carries out sealing of hole with hydrophilic epoxy, anker boring cover completes single hole technique;
The construction procedure of slurry shield tunnel secondary grouting:
1) the reserved injected hole of arrangement per ring, is evenly arranged along lining cutting annulus, and when slip casting carries out slip casting to each injected hole;Together Delamination pour slurry is carried out in one hole by the way of from outside to inside;The slip casting of different injected holes keeps symmetrical flat in same Lining Ring Weighing apparatus;Tunnel longitudinal direction grouting sequence takes the mode that spacer ring jump is beaten, 1~2 hole of once constructing per ring;
2) grouting pressure is not more than 0.3MPa during playing pipe slip casting;Cement mortar slurry flow is controlled, tunnel is made to lift every time Rising amount is not more than 2mm;When tunnel Uplifting amount is more than 2mm, suspend the slip casting in current hole, continue the after-teeming hole after sedimentation is fallen after rise Remaining slurry amount, until completing the hole all design grouting amounts;It, should be in the hole adjacent holes when the hole, slip casting needs to adjust grouting amount Supply grouting amount in position;
3) pipe-pulling speed is controlled, while drawing out note, pipe-pulling speed is gradually accelerated from outside to inside.
As priority:The construction parameter of subway tunnel micro-destabilization slip-casting is:Injected hole buries scope to wear influence under shield Section;Slip casting single-unit height is 10~30cm;Grouting sequence is:Vertical direction:It is incremented by from inside to outside, from bottom to top uniform tube drawing It constructs;Horizontal direction:Slip casting interval is repeated with hole to be no less than 3 days, the symmetrical carry out slip casting in every piece of section of jurisdiction, by settling amount Maximum point is carried out to both ends;Note is terminated when grouting amount reaches the requirement of each slip casting or single slip-casting lifting is more than alarming value Slurry.
As priority:In slurry shield tunnel secondary grouting, slip casting strengthening material uses dual slurry, and presetting period control exists 30 seconds~60 seconds, cubical contraction was less than 5%;Waterglass is 35 °~42 °;Compacted soil cement mixing content is 5~7%, and the ratio of mud is 0.5~0.6;Grouting equipment selects roudulf pump, and the same section open amount of Grouting Pipe spout is no less than 6;Grouting pump matches somebody with somebody remarks The accurate measuring instruments such as pressure, flow rate of grouting meter are starched, slip casting aperture sets blowout hookup, and Grouting Pipe and grout pipe line periodically carry out Cleaning;More than tunnel waist using tube drawing note dual slurry is beaten, replacement grouting is used below waist.
The beneficial effects of the invention are as follows:The present invention can make the existing subway tunnel that passes through of the smooth safety of slurry shield, and And can be good at the deformation for controlling existing subway and the neighbouring soil body, ensure the normal operation of existing subway.The present invention can be very Good adaptation Soft Soil Area slurry shield passes through the environment of existing subway, while can play the role of integer support well, can guarantee Construction quality, ensures the successive projects construction of slurry shield, and application prospect is good.
Description of the drawings
Fig. 1 is single hole single slip casting flow chart.
Fig. 2 is secondary grouting construction process figure.
Fig. 3 is shield tail grease pressure injection schematic diagram.
Fig. 4 is Slurry treatment system flow chart.
Fig. 5 passes through existing subway tunnel floor map for slurry shield.
Fig. 6 is shear pin schematic diagram.
Fig. 7 is to be arranged circumferentially pre-embedded steel slab schematic diagram.
Fig. 8 is housing injected hole distribution map.
Fig. 9 is the cross-section mapping of first of injected hole of anterior shield.
Figure 10 is the cross-section mapping of anterior shield second injected hole.
Figure 11 is the middle cross-section mapping of shield injected hole.
Figure 12 is cutterhead schematic diagram.
Figure 13 passes through existing constructing metro tunnel flow chart for slurry shield.
Reference sign:Existing subway uplink 1, existing subway downlink 2, certain underpass north line 3, certain underground lead to Road south line 4, shear pin 5, shear pin preformed hole 6, pre-embedded steel slab 7, interior survey weld steel 8, anterior shield 9, middle shield 10, shield tail 11, anterior shield First of injected hole 12, anterior shield second injected hole 13, middle shield injected hole 14, light-duty shell knife 15, scraper 16.
Specific embodiment
The present invention is described further with reference to embodiment.The explanation of following embodiments is only intended to help to understand this Invention.It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, also Can to the present invention some improvement and modification can also be carried out, these improvement and modification also fall into the protection domain of the claims in the present invention It is interior.
As shown in figure 1 to figure 13, it is that certain underpass slurry shield passes through Metro Tunnel, plan view such as Fig. 5 institutes Show.This slurry shield machine is equipped with weak soil cutterhead, and cutterhead aperture opening ratio is about 30%, and shield cutter schematic diagram is as shown in figure 12, and totally 217 Scraper 16,110 light-duty shell knife 15.A kind of Soft Soil Area slurry shield of the present embodiment passes through existing constructing metro tunnel side Method, the construction procedure pass through preceding working measure, through section working measure, after passing through by preparation of construction, test section working measure Five part of working measure forms.
1) preparation of construction
1.1) reconnaissance trip and data collection
Before this engineering starts construction, the track traffic to be passed through to shield is detected evaluation, understands the operating mode at scene Condition.
1.2) related network is established
It establishes and contacts with management unit, the right of injection traffic is obtained, convenient for the monitoring and accident in construction Emergency processing.Meanwhile exchange information in construction, ensure shield smooth construction and the safety of track traffic.
1.3) control zone divides
According to design requirement, due to the successively traverse track traffic twice of this engineering, the stage of passing through is divided into four pieces every time therefore Control area:Test section;Before passing through;Through section;After passing through.
1.4) technique preparation and equipment management
1.4.1) personnel depaly
Monitoring personnel is equipped at the scene, and operator on duty is equipped in duty room.Field monitoring personnel and duty room operator on duty It keeps in touch, information is summarized and instruction is communicated to construction teams and groups by operator on duty in time, and shield driving is instructed to construct.
1.4.2) mileage is checked and approved in measurement
Before shield crossing construction, review measurement shield machine mileage, confirms shield and track traffic relative position, together again When clear and definite shield crossing when each position position, to take corresponding technical measures.
1.4.3) construction parameter optimization
In work progress before shield crossing, the geological conditions that shield passes through soil layer is summed up in time, is developed suitable The method of slurry balance shield propelling construction, grasps shield driving construction parameter and synchronous mud jacking amount under the conditions of conjunction Soft Clay Change the influence degree to surface subsidence, and constantly it is optimized by practice, in the hope of reaching shield with most rationally Construction parameter traverse track traffic.
1.5) targeted design of section of jurisdiction
1.5.1) injected hole is added in section of jurisdiction
To strengthen secondary grouting and Ability of emergency management after shield crossing track traffic section, in 407 ring~437 of through section Injected hole is added in the section of jurisdiction of ring, and 2 injected holes are increased in every piece of section of jurisdiction, except the block that binds.
1.5.2 tunnel entirety force design) is enhanced as increase section of jurisdiction rigidity, caused by reducing certain underpass self-deformation Subway tunnel settles, and increases tunnel longitudinal direction and hoop rigidity using following measures in the ring of 407 ring of through section~437:Section of jurisdiction longitudinal direction Shear pin 5 is set;Pre-embedded steel slab 7 is arranged circumferentially in tunnel.
1.6) subway tunnel prevents protuberance measure
Before subway is passed through, according to subway line tunnel traffic-operating period, take measures in subway tunnel, prevent that tunnel is grand It rises.
1.6.1) subway tunnel longitudinal connecting member
Using installation section of jurisdiction longitudinal connecting member, subway tunnel longitudinal rigidity is improved.Longitudinal connecting member is installed in subway tunnel Scope respectively extends out 12m (10 ring) for west section Nan Xian centers both sides, and uplink is the ring of the 178th ring~the 197th, and downlink is the 177th The ring of ring~the 196th.Connector position is more than tunnel waist, is adjusted in practice of construction according to deployment scenarios in tunnel.
1.6.2) tunnel ballast
Under conditions of metro operation is not influenced, the preloading section of jurisdiction in tunnel reduces tunnel heaving amount.
2) test section working measure
When test section slurry shield is constructed, main detection is during slurry shield tunnels, slurry shield construction pair It is deformed caused by the neighbouring soil body and certain controlling measurement is taken to deform, make the Deformation control of the neighbouring soil body in certain model Within enclosing, slurry shield driving is reduced in the influence passed through existing subway leading portion He pass through existing subway section, guarantee slurry shield Existing subway can smoothly be passed through.
3) preceding working measure is passed through
Pass through be pushed forward into when, mainly with regard to mud hydraulic pressure, muddy water quality, fltting speed, grouting amount and grouting pressure set It is analyzed with surface subsidence relation, changing rule is settled by this section of section shield driving soil body and gropes soil mass property pair Ground and the settlement influence rule of track traffic set construction parameter when passing through and corresponding measure are taken to reduce soil body sedimentation, Ensure the safety of track traffic.
3.1) mud hydraulic pressure is set
Mud hydraulic pressure setting corrects mud hydraulic pressure setting value, for safety in time according to the surface subsidence data for passing through leading portion It passes through and lays a solid foundation.
3.2) muddy water quality index
Pass through be pushed forward into when, by muddy water density domination in 1.15~1.30g/cm3Left and right, while viscosity control is in 18s More than.
3.3) fltting speed is set
Pass through be pushed forward into when, fltting speed is set as 2cm/min~3cm/min.
3.4) synchronous grouting
3.4.1) slip casting measure
Since the outer diameter of shield is more than the diameter of section of jurisdiction, with the propulsion of shield, generation is built between section of jurisdiction and the soil body Build gap.In order to fill these gaps in time, influence of the shield-tunneling construction to ground is reduced as far as possible.
So using synchronous grouting method.The synchronous grouting system of this slurry shield uses single fluid grouting mode, by sending slurry outside Liquid is sent to underground slurry bucket, the slurry bucket being transported to by trucd mixer on vehicle frame, and in shield driving, mouth injection soil is outpoured by 4 points Body fills structure void in time, prevents land subsidence.
In order to ensure simultaneous grouting slurry can be effectively injected the soil body, it is necessary to assure 4 position pipelines outpour the pressure of mouth Respectively greater than corresponding 11 mud hydraulic pressure of each position shield tail, since top to bottom is there are pressure differential, pressure differential also with shield 11 mud hydraulic pressure of tail is corresponding, from top to bottom the grouting theory pressure difference value in four cross sections be respectively 0.045MPa, 0.09MPa、0.045MPa.Due to consideration that the factors such as tunnel upward floating, therefore therefore grouting amount can also be adjusted, directly result in The adjustment of grouting pressure, the grouting pressure of four sections are all controlled by computer process.
3.4.2) synchronous grouting material
Synchronous grouting material is considered as single slurry, has the property that:
1. injecting paste material fillibility is good;
2. after filling, intensity suitable with the soil body or more can be obtained in early stage;
3. after hardening, the reduction volume of volume is small, sealing will be got well;
The water-reducible characteristic in underground is not affected or less affected by 4. possessing;
5. good fluidity, isolation is few;
6. pumpability is good, bleeding quantity is small during long distance delivery;
7. construction management will facilitate;
8. pollution is not generated;
3.4.3) mud jacking point:4 methods
By 4 slip casting points of shield body synchronous grouting system to the synchronization implementation slip casting of section of jurisdiction exterior building gap, ensure Timely, the reasonable filling in 11 gap of shield tail.
3.4.4) injecting paste material and proportioning
The proportioning of optimized synchronization slurries improves shear resistance and the presetting period of synchronous slurries, reduces section of jurisdiction abjection shield tail 11 Float-amount afterwards.West section south line crossing construction further optimizes grout coordinate ratio, increases sand dosage, and playing increases slurries shear resistance The effect of energy.Increase lime consumption, slurries shearing strength is made to reach 1kpa, required time is when 1 is small or so.
3.4.5) grouting pressure
Grouting pressure is set according to the following formula:
P=P1+P2+P3
Wherein, P is grouting pressure;P1For the notch water pressure of corresponding position;P2(taking 2bar) is hindered for pipe;P3For constant 1.5bar;POn=P+1bar;PUnder=P-1bar.
It should be also adjusted in construction according to actual conditions, accomplish that grouting pressure and Earth Pressure Around maintain balance.
3.4.6) grouting amount
Theoretical gap is:
To prevent tunnel upward floating, dense packing effect is answered in building gap, actual grouting amount be theoretical structure void 110%~ 130%, i.e. 11.93~14.10m3.Depending on the pressure value and stratum deformation monitoring data of mud jacking amount and mud jacking point when mud jacking.
3.4.7) pipeline-cleaning
To ensure that pipeline is unimpeded, slurry storing tube, grouting equipment and the timing of pipe network are cleaned.
3.5) pressure injection of shield tail grease and centralized lubrication material
Slurry shield machine shield tail 11 is provided with twice wire brush steel plate brush with together with, shield tail grease pressure injection hole 6.In order to Safety and the driving task for favorably accomplishing tunnel must effectively carry out the pressure injection work of shield tail grease, strictly press in the process It is required that the first time for implementing shield tail grease in new wire brush before appearing smears work.Shield tail grease pressure injection should regular, quantitative, positioning Pressure injection, the pressure injection amount per ring are just set to 175kg.When finding that shield tail 11 has a small amount of spillage, spillage position should be mended in time Press shield tail grease.The centralized lubrication material used in this engineering is centralized lubrication EP1.
3.6) making of segments' joints waterproofing coating
3.6.1) segment mobilization and stacking
2, section of jurisdiction underlay sleeper (along section of jurisdiction longitudinal direction), section of jurisdiction is embarked on journey, is stacked in column neatly.
3.6.2) section of jurisdiction makes and can be stained with dirt, oil stain in transporting, it is necessary to specialist tools such as wire brush, hairbrush to pipe The end face of the ad hoc capillary groove of piece and section of jurisdiction carries out dirt and floating dust cleaning.
3.6.3) the stickup of water proof rubber gasket
Section of jurisdiction selects the elastic rubber gasket of homotype to be inserted in it from top, and the face for needing brushing bonding agent is inverted court Outside, it is necessary to correctly select model, prevent and get wrong.The uniform brushing neoprene bonding agent 1~2 in clean, dry section of jurisdiction capillary groove Time, while in water proof rubber gasket inner face also uniform brushing neoprene bonding agent 1 time, brushing must uniformly, exhaustive.It waits to be bonded Agent is just dry (contacting tack-free, not wire drawing with hand), and gasket is put into slot and is pasted, program:First both ends of the surface, rear ring Face, it is intermediate gradually to extend to both ends, the necessary smooth fitting in corner is pasted, it can not protrusion or weak.Then it is hit with wooden mallet, makes it It pastes fully, avoids floating, to prevent that gasket dislocation is lost when going into the well handling and assembly, causes assembled difficulty and waterproof mistake Effect.
3.6.4) the installation of section of jurisdiction vertical positioning rod
In order to during pipe sheet assembling, preferably be positioned to Longitudinal Joint between Segments, Φ is used in Longitudinal Joint between Segments design 58.7 locating bar.After water-repellent paint completes in section of jurisdiction, the installation (glue bonding) of locating bar is carried out.
3.7) pipe sheet assembling and waterproof
3.7.1) pipe sheet assembling
The lifting requirements of prefabricated components have good contact surface with circular tunnel, to carry out tunnel water proofing, full circle degree etc. Control.The pipe sheet assembling operation of slurry shield should avoid a large amount of ponding in working region, should under the premise of drainage equipment is added The good hydraulic pipeline leakage water spot of timely processing creates good operating environment for pipe sheet assembling.
1. before shield driving construction
A. back seat is strengthened.To ensure that reference rings anchor ring is smooth during shield starting, and it is vertical with design axis.
B. section of jurisdiction must carry out section of jurisdiction before assembly the cleaning of anchor ring, end face.
2. in shield driving
A. according to the gap of the deviation and shield shell of elevation in shield report and plane and section of jurisdiction surrounding, shield is strictly controlled Posture avoids shield from blocking annulus section of jurisdiction.
B. shield driving axis is rationally controlled, reduces unnecessary shield driving correction, and correction amount must be grasped every time In allowed band.
3. during pipe sheet assembling
A. during entire assembly, left-hand rotation should be implemented in the case of straight line, the principle separately arranged of turning right;Plane curve feelings Under condition, section of jurisdiction rotation angle should be reasonably selected in time according to data such as current shield attitude, segment overshoots.
B. the rubbish and sundries at assembly position at shield tail 11 are removed during assembly, while must be noted that section of jurisdiction positions It is correct, the positioning of especially first piece section of jurisdiction can influence the quality after the cyclization of domain section of jurisdiction and good with the relative position of shield Good degree.
C. to accomplish that segment joint is closely connected as far as possible, anchor ring is smooth meticulously per ring pipe sheet assembling.
D. when assembled, it is to be ensured that " T " word connector is smooth.
E. anchor ring advanced argument is strictly controlled.
F. before the block that binds per ring assembly is inserted into, it is necessary to measure the opening between adjacent block, too small openings is avoided to cause to bind Fragmentation or the excessive block insert port longitudinal joint that binds of opening are larger after block insertion.
G. annulus section of jurisdiction is bolted by vertical, circumferential direction, and the tight ness rating of connection will directly influence the entirety in tunnel Performance and quality.Therefore tightened immediately after every endless tube piece cyclization;It is multiple under the action of top power is promoted when promoting next ring Tight longitudinal bolt.
H. after each piece of pipe sheet assembling, stretch out jack and control to required top power, then carry out next piece of section of jurisdiction Assembly, such block-by-block carries out, and completes the assembly of a ring.
I. the top power of jack is adjusted after assembly in time, prevents shield attitude from undergoing mutation.
J. due to being connected section of jurisdiction with the pattern that embedded nut connects using oblique bolt, in assembly, section of jurisdiction must be accurate Positioning, it is ensured that oblique bolt is docked with embedded nut.
3.7.2) section of jurisdiction waterproof
1. in strict accordance with the application work for requiring to carry out segments' joints waterproofing coating.
2. as found the seam infiltration of cyclic tunnel, using the timely slip casting of section of jurisdiction injected hole, to block penetrating passage.
3.8) axial line control
3.8.1 the measurement accuracy in tunnel) is ensured
3.8.2) segment selection
What is applied in this engineering is general endless tube piece, selects correct section of jurisdiction rotation angle, can guarantee the suitable of assembled work Profit carries out and improves assembled quality, and guarantee constructs tunnel and meets design axis.
3.8.3) TBM's position control
It during shield driving, constantly pushes ahead by jack, for ease of axial line control, jack setting is divided into Different zones.On the premise of notch hydraulic pressure correctly setting, the stroke of each region oil pressure and jack, while shield should be strictly controlled The related shield spatial position and the continuous newer information in orientation that structure driver is provided according to shield attitude monitoring system, are adjusted at any time Whole shield driving direction and posture are rationally rectified a deviation, and are accomplished frequently to entangle, are reduced single correction amount, realize shield along design axis direction It promotes.
3.8.4 construction parameter) is strictly controlled
Notch hydraulic pressure should be correctly set when being promoted per ring, ensures to reduce soil disturbance close to theoretical value per ring soil sand amount.
3.9) Land-Subsidence Control
3.9.1) per in ring progradation, stringent to control notch hydraulic pressure, fluctuation range is controlled within 0.005MPa
The notch front soil body keeps stable state, to reduce the level of disruption to the soil body.
3.9.2 the construction method that information is fed back) is taken to carry out control settlement amount to shield crossing localized ground longitudinal axis position Put laying settlement observation point, and it is spaced apart lay horizontal measuring frequency section into line trace settlement observation, by settlement number According to timely feedbacking and analyzing, the construction parameter to adjust the next stage provides foundation.
3.9.3) fltting speed control is in setting range.
3.9.4) grind slurries quality and synchronous grouting construction parameter is controlled to fill 11 structure void of shield tail in time, to settling amount compared with Big scope can make ftercompction slurry more than twice.
3.9.5) according to sedimentation situation, muddy water index is adjusted in time, to ensure the stabilization of excavation face.
4) staged construction measure is passed through
4.1) mud and water balance pressure in front is set
According to west section north line condition of construction, notch enters below subway tunnel, and notch water pressure is adjusted to 0.33MPa, It monitors situation according to existing subway tunnel afterwards to be adjusted, the amplitude adjusted every time is 0.005MPa.
4.2) muddy water quality index
Under normal circumstances, muddy water density domination is in 1.15~1.30g/cm3Left and right, while viscosity control is in more than 18s.Together When, when 2 rings to notch crosses the construction of 1 ring of track traffic before shield machine reaches track traffic, pass through the new slurry mixing system on vehicle frame Unite addition HS-2 (New Kind of Plugging Agent), the direct pressure injection of past excavation face, increases itself leak stopping function of muddy water, ensures the matter of mud film Amount further improves the stability of the front soil body.
4.3) fltting speed setting
Rational fltting speed is controlled, shield is made at the uniform velocity to construct at a slow speed, reduces disturbance of the shield to the soil body.It is applied passing through area During work, shield driving speed control is stablized in 1cm/min~2cm/min, as far as possible holding fltting speed, it is ensured that shield is equal Weighing apparatus, evenly traverse track traffic, to reduce the disturbing influence to the periphery soil body.
4.4) pipe sheet assembling
When passing through, to avoid causing surface subsidence due to segment assembly causes the retrogressing of shield machine, therefore pushed away in shield Should not be assembled immediately after into end, after waiting 2~3 minutes, after being consolidated to surrounding soil and shield machine again into The retraction of row jack, the jack of retraction should lack as far as possible, and should telescopic jack one by one, pipe sheet assembling can be met i.e. Can, keep the balance pressure of excavation face.During assembly, the control of mud hydraulic pressure is paid attention to, maintain soil body balance in front of shield, to the greatest extent Measure skilled assembling process, it is ensured that high-quality quick-assembling section of jurisdiction.In addition the anchor ring flatness of section of jurisdiction is strictly controlled in pipe sheet assembling And full circle degree;By the reasonable selection for block position of binding, control section of jurisdiction and the gap of shield tail 11 prevent the broken of section of jurisdiction extrados It splits.
4.5) synchronous grouting
When passing through, synchronous grout coordinate ratio will be adjusted correspondingly according to examination propulsion data, optimize grout coordinate ratio,
And carry out verification experimental verification.Synchronous grouting amount and grind slurries quality are strictly controlled in construction, every ring synchronous grouting is starched Liquid carries out slump test, it is desirable that controls between 14 ± 2cm, must be adjusted for undesirable slurries.Simultaneously For uniformly, be sufficient filling with 11 structure void of shield tail, in shield driving, synchronous grouting amount must match with fltting speed, work as rank Section grouting amount must stop promoting when being less than calculation stages grouting amount 10%, be promoted again after grouting amount reaches requirement.
4.6) housing slip casting
In order to ensure slurry shield machine can smoothly, safety pass through existing subway, it is necessary to effectively control soil disturbance And soil layer loss late.Housing slip casting can fill shield-tunneling construction structure void in advance, further hold shield machine body, reduce shield Disturbance of the structure machine to the soil body reduces ground loss ratio, and effectively controls tunnel upward floating and tunnel convergence.
Shield housing slip casting, housing injected hole distribution map as shown in figure 8, this TV station slurry shield machine in itself middle shield 10 be equipped with 11 A injected hole, position is as shown in figure 11, and bottom is set there are one injected hole, and shield shell both sides are uniformly distributed 10 injected holes, and the later stage exists 16 injected holes are added at 9 plastron of anterior shield, position is as shown in Fig. 9,10, and first of injected hole of anterior shield 12 is 6, anterior shield second Injected hole 13 is 10.When needing slip casting, ball valve at the injected hole of shield machine housing is opened, if necessary to each injected hole into Row slip casting, operating pressure are about 0.3MPa;According to the position and side of the appropriate adjustment slip casting of surface state and shield axis situation Amount.It is made to increase while the soil body carries shield machine, effectively protective effect is also functioned to ground.
4.7) control of shield attitude
In crossing process, ensuring that shield front settlement Control is good, make as far as possible shield at the uniform velocity, straight line By reducing shield correction amount and correction number.It is promoted using steady slope method, gentle slope method, to reduce shield-tunneling construction to track traffic With the influence on ground.When curved section is constructed, shield attitude constantly changes shield with shield driving, shield cutting part The continuous soil body of backbreaking, causes Stratum Loss, so as to cause subsidence.Therefore injected hole on shield machine is set, works as shield machine When curved section tunnels, slip casting is carried out on the outside of curve by the injected hole on shield machine, supplements Stratum Loss caused by driving, Simultaneously because one lateral pressure of shield machine can be given on the outside of curve by mending slurry, shield chain-drive section is made to be deflected to the inner side of curve, so as to Not only Stratum Loss caused by being tunneled due to curve had been supplemented, but also shield chain-drive section can be promoted to be tunneled along axis.
4.8) ballast in tunnel
In west section south during line crossing construction, tunnel weight is increased using tunnel duct piece preloading, reduces tunnel upward floating amount.
4.8.1) section of jurisdiction preloading
After the completion of the stage is passed through per ring assembly, first mouth word part is installed in place, then by 3 pieces of placements in next endless tube piece On section of jurisdiction between mouth word part and shield tail 11, then carry out next ring propulsion.
4.8.2) ballast preloading
Ballast is not noted with 1# vehicle frame counterweights in tunnel, and weight total weight is 100T in preliminary project tunnel, is uniformly distributed in 1# vehicle frames.
4.9) Land-Subsidence Control
4.9.1) per in ring progradation, stringent to control notch hydraulic pressure, fluctuation range is controlled within 0.005MPa
The notch front soil body keeps stable state, to reduce the level of disruption to the soil body.
4.9.2 the construction method that information is fed back) is taken to carry out control settlement amount to shield crossing localized ground longitudinal axis position Put laying settlement observation point, and it is spaced apart lay horizontal measuring frequency section into line trace settlement observation, by settlement number According to timely feedbacking and analyzing, the construction parameter to adjust the next stage provides foundation.
4.9.3) fltting speed control is in setting range.
4.9.4) grind slurries quality and synchronous grouting construction parameter is controlled to fill 11 structure void of shield tail in time, to settling amount compared with Big scope can make ftercompction slurry more than twice.
4.9.5) according to sedimentation situation, muddy water index is adjusted in time, to ensure the stabilization of excavation face.
4.10) structure synchronization is constructed
The placement of this slurry shield tunnel synchronous construction mouth word part and the casting and compacting of concrete of tunnel bracket will closely follow shield Structure is constructed.The weight of mouth word part and concrete bracket can generate ballast effect to tunnel, and one will be played to the floating for preventing tunnel Fixed effect.
4.11) transmission of multidate information
Measurement results will summarize in time each time gives construction technology department, in order to which construction technical staff understands construction in time Present situation and corresponding region deformation, determine the information such as new construction parameter and grouting amount and instruction, and pass to shield driving Face makes propelling construction face be adjusted accordingly in time, and effect is determined finally by monitoring, so as to iterative cycles, verification, perfect, really Protect constructing tunnel quality.
5) rear working measure is passed through
After region is passed through in the disengaging of shield tail 11, enter and pass through the rear stage, fltting speed 2cm/min~3cm/min, control The parameters such as good mud hydraulic pressure, fltting speed, region oil pressure cntrol and synchronous grouting.The subsequent sedimentation of track traffic must be carried out Tracking and monitoring, and prepare sufficient ftercompction pulp material and equipment in tunnel, later stage ftercompction is carried out according to settlement monitoring situation Slurry, it is ensured that control the posterior settlement of track traffic in allowed band.Certain underpass slurry shield tunnels, and only adopts in principle With synchronous grouting, when subway tunnel deformation reaches early warning value, subway tunnel inner micro-destabilization slip-casting and slurry shield tunnel can be used Road secondary grouting.
5.1) subway tunnel micro-destabilization slip-casting
When existing subway tunnel is passed through under newly built tunnels causes tunnel appearance larger sedimentation, in order to control tunnel subsidence, Using subway tunnel micro-destabilization slip-casting strengthening construction engineering method.
5.1.1) construction technology
1. setting-out
Since section of jurisdiction is staggered joint erection, and there is part section of jurisdiction for irregular staggered joint erection, it, can be in-orbit when designing injected hole Road both sides drill on the section of jurisdiction of lower sleeping soil layer, and a hole is located at calibrated bolck section of jurisdiction, and a hole is located at arch bottom pipe Then piece processes hole position locating piece, to ensure the uniformity of every piece of section of jurisdiction hole position, accurate setting-out, hole according to actual section of jurisdiction Setting-out error in position is less than 2mm;Sampling point is confirmed before drilling, in order to avoid the cut-out main reinforcing bar in section of jurisdiction;
2. drilling machine positions
It is first drilled using multifunctional electric hammer and setscrew is installed, hole-drilling system, and boring positioning are installed;
3. perforate (perforate)
Perforate, aperture about 62mm, hole depth about 300mm are carried out using hole-drilling system.Hole-drilling system posture is adjusted before perforate, is protected Demonstrate,prove the verticality of perforate;
4. mounting hole pipe
It after pore-forming, is first cleared up, pours into anchoring adhesive, be connected using 57 seamless steel pipes of Φ as orifice tube with section of jurisdiction;With Locating rack confirms that injected hole structure height is less than limit for height;
5. mounting ball valve and blowout hookup
2 cun of ball valves are connected with orifice tube, when slip casting installs blowout hookup on ball valve;
6. drill tube wall (secondary perforate)
It is bored with TE80 multifunctional electric hammers, drills tube wall, aperture is about 35mm;
7. being inserted into slip casting core pipe, Grouting Pipe is set
Slip casting core pipe uses 28 seamless steel pipes of Φ of silk mouth connection, and the lateral cross in core pipe end opens 2 row, 4 hole, aperture 4mm, Aperture guard device grows at least 10cm, slightly thicker than Grouting Pipe.During construction, core pipe end is wrapped up using enamel-cover cloth, prevents its blocking that comes off Slurry outlet;With special equipment, according to each slip casting depth, Grouting Pipe is beaten by root by blowout hookup, ball valve and orifice tube If underground layer;
8. connect grouting pipeline
Dual slurry grouting pump, flow instrument, mixer and Grouting Pipe are connected by grouting pipeline;
9. prepare slurries
With the small-sized slurry system of mixing of self-control by 0.6~0.8 mixing cement mortar of the ratio of mud;
10. slip casting, tube drawing
Slip casting is carried out using double pump two fluid grouting method, side tube drawing is starched using special tube drawing apparatus marginal not, it is slowly continuous equal Even progress, pipe-pulling speed match with flow rate of grouting, slip casting single-unit height, grouting amount.
It determines as the following formula:
Wherein, v-pipe-pulling speed (cm/min);L-single slip casting length (cm);V-single grouting amount (L);Q-biliquid Starch flow (L/min).
Pull out Grouting Pipe
Slip casting is completed on request, and Grouting Pipe is stagnated 15 minutes or more, after slurries initial set, will be noted using special tube drawing apparatus Slurry pipe is all pulled out;Ball valve is closed, removes blowout hookup, single slip casting is completed;
Repeat slip casting
It pressesWorking procedure requires to repeat to construct according to practice of construction, until reaching whole hole condition;
Remove ball valve, sealing of hole
After reaching whole hole condition, ball valve is removed, carries out sealing of hole with hydrophilic epoxy, anker boring cover completes single hole technique.
5.1.2) construction parameter
1. injected hole buries scope:Influence section, settling amount and rate of settling larger part are worn under shield.2 are opened up per ring Injected hole, single hole slip casting number, slip casting depth will be depending on slip casting effects and monitoring data.
2. slip casting single-unit height:10~30cm, depending on live actual monitoring data;
3. grouting pressure:Grouting pressure is determined according to practice of construction monitoring needs;
4. grouting sequence:
Vertical direction:It is incremented by from inside to outside, from bottom to top uniform tube drawing is constructed;
Horizontal direction:It constructs every 23 Huantiao rings, repeating slip casting interval with hole is no less than 3 days.And according to monitoring situation and When adjust;The symmetrical carry out slip casting in every piece of section of jurisdiction;It is carried out from settling amount maximum point to both ends, specific injected hole position of constructing every time It is determined according to deformation measurement data before construction;
5. A liquid:Water (tap water, 0.6~0.8), cement (PC32.5/P042.5 grades of conch, 1), additive (Bx-2, 0.005~0.01), B liquid:35 ° of Be ' neutral water glasss, dual slurry volume ratio:A liquid:B liquid=1:0.4~1
6. slip casting end condition:Grouting amount reaches the requirement of each slip casting;Single slip-casting lifting be more than alarming value (± 1~ 2mm)。
5.2) certain slurry shield tunnel secondary grouting
5.2.1) designing scheme
When slurry shield is by existing subway, the pre-buried injected hole in section of jurisdiction added in acrossing range is opened, is taken timely, more To carrying out mending slurry construction after the wall of section of jurisdiction, range of grouting is 2 meters outside tunnel for secondary, enough ftercompction slurry measures.
5.2.2) arrangement and method for construction
Slip casting strengthening material uses dual slurry, and at 30 seconds~60 seconds, cubical contraction was less than 5% for presetting period control.Institute It it is P.O.42.5 grades with raw material strength of cement grade, waterglass is 35 °~42 °;Compacted soil cement mixing content (weight ratio) for 5~ 7%, the ratio of mud is generally 0.5~0.6, can be appropriately adjusted according to stratum and field experiment situation.Grouting equipment selects Hai Na Pump, Grouting Pipe spout hatch bore diameter 5mm, same section open amount are no less than 6.Grouting pump is equipped with grouting pressure, slip casting stream The accurate measuring instrument such as gauge, slip casting aperture set blowout hookup, and Grouting Pipe and grout pipe line should be cleaned periodically, to prevent It blocks.More than tunnel waist using tube drawing note dual slurry is beaten, length of tube is beaten as 1.5m, replacement grouting is used below waist.
Construction process is as follows:Per ring, the reserved injected hole of arrangement is 22, every piece of section of jurisdiction three, along the uniform cloth of lining cutting annulus It puts.During slip casting slip casting (except the block that binds) need to be carried out to each injected hole.Divided in same hole by the way of from outside to inside Layer slip casting, each tube drawing length 15cm.The slip casting of different injected holes keeps symmetrical balance in same Lining Ring.Under normal circumstances, Tunnel longitudinal direction grouting sequence takes the mode that spacer ring jump is beaten, 1~2 hole of once constructing per ring, each two construction 4 ring of central spacer.It is special It should suitably be adjusted according to subway tunnel monitoring date in the case of different.Time for injecting should be selected according to the variation of monitoring data, adjacent Slip casting twice preferably selects, when sedimentation falls back to 0 or its settling amount is more than 2mm, to remain that subway line is in micro crowned State (2~3mm).Grouting pressure crosses senior general and region soil body is generated compared with large disturbances, therefore plays pipe slip casting and should strengthen in the process pair The control of grouting pressure, grouting pressure should be not more than 0.3MPa.Cement mortar slurry flow is preferably controlled in 15L/min, ensures tunnel Each Uplifting amount is not more than 2mm.When tunnel Uplifting amount is more than 2mm, the slip casting in current hole should be suspended, continued after sedimentation is fallen after rise After-teeming hole residue slurry amount, until completing the hole all design grouting amounts.When the hole, slip casting truly has difficulty to need to adjust grouting amount When, grouting amount should be supplied in the hole adjacent holes position.Tube drawing uniformly strictly will control pipe-pulling speed during slip casting, while note is drawn out, Each tube drawing length is 15cm, and pipe-pulling speed is generally gradually accelerated from outside to inside.
When certain underpass slurry shield tunnels, in principle only with synchronous grouting, reach early warning in subway tunnel deformation During value, subway tunnel inner micro-destabilization slip-casting and slurry shield tunnel secondary grouting can be used.

Claims (3)

1. a kind of Soft Soil Area slurry shield passes through existing constructing metro tunnel method, it is characterised in that:Including subway tunnel perturbation Dynamic slip casting and slurry shield tunnel secondary grouting, comprise the following steps:
The construction procedure of subway tunnel micro-destabilization slip-casting:
1) setting-out:It drills, reprocesses on the calibrated bolck section of jurisdiction of lower sleeping soil layer and arch bottom section of jurisdiction on track both sides Hole position locating piece, confirms sampling point before drilling;
2) drilling machine positions:It is drilled using electric hammer drill and setscrew is installed, hole-drilling system, and boring positioning are installed;Perforate:Using Hole-drilling system carries out perforate, and hole-drilling system posture is adjusted before perforate;Mounting hole pipe:It is cleared up after pore-forming, pours into anchoring adhesive, It is connected using seamless steel pipe as orifice tube with section of jurisdiction;
3) ball valve is connected with orifice tube, when slip casting installs blowout hookup on ball valve;Tube wall is drilled with electric hammer drill;
4) slip casting core pipe uses the seamless steel pipe of silk mouth connection, and during construction, slip casting core pipe end is using enamel-cover cloth package;According to every Grouting Pipe is set underground layer by secondary slip casting depth by blowout hookup, ball valve and orifice tube by root;
5) dual slurry grouting pump, flow instrument, mixer and Grouting Pipe are connected by grouting pipeline;With small-sized slurry system of mixing by water 0.6~0.8 mixing cement mortar of gray scale;Slip casting is carried out using double pump two fluid grouting method, side tube drawing is starched using tube drawing apparatus marginal not, Pipe-pulling speed matches with flow rate of grouting, slip casting single-unit height, grouting amount;
It determines as the following formula:
<mrow> <mi>v</mi> <mo>=</mo> <mfrac> <mi>l</mi> <mrow> <mi>V</mi> <mo>/</mo> <mi>q</mi> </mrow> </mfrac> </mrow>
Wherein, v-pipe-pulling speed/cm/min;L-single slip casting length/cm;V-single grouting amount/L;Q-dual slurry flow/ L/min;
6) slip casting is completed on request, after slurries initial set, is all pulled out Grouting Pipe using tube drawing apparatus;Ball valve is closed, is removed Blowout hookup, single slip casting are completed;
7) slip casting is repeated:It repeats to construct by step 5)~step 6), until reaching whole hole condition;After reaching whole hole condition, remove Ball valve carries out sealing of hole with hydrophilic epoxy, and anker boring cover completes single hole technique;
The construction procedure of slurry shield tunnel secondary grouting:
1) the reserved injected hole of arrangement per ring, is evenly arranged along lining cutting annulus, and when slip casting carries out slip casting to each injected hole;Same hole It is interior that delamination pour slurry is carried out by the way of from outside to inside;The slip casting of different injected holes keeps symmetrical balance in same Lining Ring;Tunnel Road longitudinal direction grouting sequence takes the mode that spacer ring jump is beaten, 1~2 hole of once constructing per ring;
2) grouting pressure is not more than 0.3MPa during playing pipe slip casting;Cement mortar slurry flow is controlled, makes each Uplifting amount in tunnel No more than 2mm;When tunnel Uplifting amount is more than 2mm, suspend the slip casting in current hole, it is remaining to continue the after-teeming hole after sedimentation is fallen after rise Slurry amount, until completing the hole all design grouting amounts;When the hole, slip casting needs to adjust grouting amount, it should be mended in the hole adjacent holes position Sufficient grouting amount;
3) pipe-pulling speed is controlled, while drawing out note, pipe-pulling speed is gradually accelerated from outside to inside.
2. Soft Soil Area slurry shield according to claim 1 passes through existing constructing metro tunnel method, it is characterised in that:Ground The construction parameter of iron tunnel micro-destabilization slip-casting is:Injected hole buries scope to wear influence section under shield;Slip casting single-unit height is 10~30cm;Grouting sequence is:Vertical direction:It is incremented by from inside to outside, from bottom to top uniform tube drawing is constructed;Horizontal direction: Slip casting interval is repeated with hole to be no less than 3 days, the symmetrical carry out slip casting in every piece of section of jurisdiction is carried out from settling amount maximum point to both ends; Slip casting is terminated when grouting amount reaches the requirement of each slip casting or single slip-casting lifting is more than alarming value.
3. Soft Soil Area slurry shield according to claim 1 passes through existing constructing metro tunnel method, it is characterised in that:Mud In water shield tunnel secondary grouting, slip casting strengthening material uses dual slurry, and presetting period control was at 30 seconds~60 seconds, volume contraction Rate is less than 5%;Waterglass is 35 °~42 °;Compacted soil cement mixing content is 5~7%, and the ratio of mud is 0.5~0.6;Grouting equipment selects With roudulf pump, the same section open amount of Grouting Pipe spout is no less than 6;Grouting pump is equipped with grouting pressure, flow rate of grouting meter etc. Accurate measuring instrument, slip casting aperture set blowout hookup, and Grouting Pipe and grout pipe line are periodically cleaned;It more than tunnel waist adopts With tube drawing note dual slurry is beaten, replacement grouting is used below waist.
CN201711145032.0A 2017-11-17 2017-11-17 A kind of Soft Soil Area slurry shield passes through existing constructing metro tunnel method Pending CN108104824A (en)

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CN109184743A (en) * 2018-09-25 2019-01-11 中铁十二局集团有限公司 Existing tunnel construction method is worn under circle boulder clay rock compound stratum slurry shield short distance
CN109736842A (en) * 2019-01-10 2019-05-10 中铁隧道集团二处有限公司 The construction method in foundation-free residential house area is passed through in a kind of slurry shield reduction disturbance
CN109779639A (en) * 2019-01-03 2019-05-21 上海隧道工程有限公司 Suitable for wearing the anti-floating control method in existing major diameter tunnel in arenaceous stratum shield
CN109812271A (en) * 2019-01-25 2019-05-28 中铁十一局集团城市轨道工程有限公司 A kind of shield crosses the construction method for invading limit box culvert
CN110043270A (en) * 2019-05-14 2019-07-23 上海隧道工程有限公司 Administer the construction method of Shield Tunnel in Soft Soil convergent deformation
CN110820721A (en) * 2019-11-25 2020-02-21 中铁隧道局集团有限公司 Process for reinforcing blasting area by sleeve valve pipe grouting
CN112031801A (en) * 2020-07-27 2020-12-04 北京中煤矿山工程有限公司 Subsidence control method for subway tunnel to penetrate existing operation line
CN112228116A (en) * 2020-10-27 2021-01-15 中铁十二局集团有限公司 Construction method for synchronous slurry supplement in shield construction of water-rich stratum

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109184743A (en) * 2018-09-25 2019-01-11 中铁十二局集团有限公司 Existing tunnel construction method is worn under circle boulder clay rock compound stratum slurry shield short distance
CN109779639A (en) * 2019-01-03 2019-05-21 上海隧道工程有限公司 Suitable for wearing the anti-floating control method in existing major diameter tunnel in arenaceous stratum shield
CN109736842A (en) * 2019-01-10 2019-05-10 中铁隧道集团二处有限公司 The construction method in foundation-free residential house area is passed through in a kind of slurry shield reduction disturbance
CN109812271A (en) * 2019-01-25 2019-05-28 中铁十一局集团城市轨道工程有限公司 A kind of shield crosses the construction method for invading limit box culvert
CN109812271B (en) * 2019-01-25 2020-08-28 中铁十一局集团城市轨道工程有限公司 Construction method for shield-crossing limited box culvert
CN110043270A (en) * 2019-05-14 2019-07-23 上海隧道工程有限公司 Administer the construction method of Shield Tunnel in Soft Soil convergent deformation
CN110820721A (en) * 2019-11-25 2020-02-21 中铁隧道局集团有限公司 Process for reinforcing blasting area by sleeve valve pipe grouting
CN112031801A (en) * 2020-07-27 2020-12-04 北京中煤矿山工程有限公司 Subsidence control method for subway tunnel to penetrate existing operation line
CN112228116A (en) * 2020-10-27 2021-01-15 中铁十二局集团有限公司 Construction method for synchronous slurry supplement in shield construction of water-rich stratum

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