CN101131090A - Construction method for shallow soil-covered river bed under shield tunnel - Google Patents
Construction method for shallow soil-covered river bed under shield tunnel Download PDFInfo
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Abstract
The construction process for shielded tunnel to penetrate through river bed with shallow covered soil layer includes the following steps: engineering investigation, river bed analogy, calculation and analysis, research and determination of technological scheme, determining auxiliary measures and setting the initial shielding parameters, river bed penetrating construction, etc. The auxiliary measures include foundation consolidation, setting anti-floating plate, surface blasting weight, etc. The initial shielding parameters include earth pressure, earth output amount, propulsion speed, grouting amount, etc. During the construction, one computerized real-time monitoring system is adopted for comprehensive monitoring on tunnel sedimentation, displacement and other conditions. The construction process can ensure safety and avoid water inrush, collapse and other accidents.
Description
Technical field
The present invention relates to a kind of job practices of shallow soil-covered river bed under shield tunnel, belong to the tunneling shield technical field of construction.
Background technology
Along with the development and utilization of the underground space, shield construction has obtained application more and more widely in China.The shield tunnel construction is a kind of job practices of building the tunnel in the underground tunneling, utilizes the facility of shield structure as the underground soil body of excavation and the supporting soil body and assembly unit tunnel lining, excavation 1 ring, and assembly unit 1 ring, periodic duty is until finishing the whole piece tunnel.The successful Application of city underground shield construction such as Beijing, Shanghai makes this construction technology become better and approaching perfection day by day in China.
Compare with traditional drill bursting construction, shield construction have automaticity height, different geological conditions compliance strong, little to the influence of townsfolk and building, in soft stratum, help controlling advantages such as subsidence, safety height.
But both at home and abroad wait the research of shield-tunneling construction under the environment deep not enough shallow soil-covered river bed down, this type of shield-tunneling construction situation is seldom related to and discusses, its construction technology is still waiting perfect.
It is along the line that No. 9 line first stage of the project of Shanghai Rail Transit R413 bid section shield tunnel (nine booths station-Sapporo station) is positioned at Minhang District Shanghai, Shanghai City pine highway, is made up of the main track (two-wire) and section line (two sections) two parts of coming in and going out, and total length 6249.676m adopts shield construction.
Interval shield tunnel needs little Lai port, river crossing, and its minimum place of thickness of earth covering, shield tunnel apex distance planning riverbed only is 2.3m.Not only there is the problem of shallow earthing in the shield structure when passing through the riverbed, and because geological condition changes rapid, soil property and underground water situation are also very complicated, very easily produce water burst, cave-in accident, the positive setting of soil pressure rationally of shield structure also is a difficult point, and it is all very unfavorable that these advance the shield structure.
Therefore, seeking rationally under environment like this, perfect shield-tunneling construction scheme is one technical barrier that the utmost point need solve in this constructing tunnel process.
Summary of the invention
The purpose of this invention is to provide a kind of shallow soil-covered river bed under shield tunnel job practices, applicable to carrying out shield-tunneling construction, and accident such as avoid producing water burst in the work progress, cave in, guarantee construction safety following shallow soil-covered river bed the grade under the environment.
The technical solution adopted for the present invention to solve the technical problems is:
The shallow soil-covered river bed under shield tunnel job practices comprises following key step:
The first, the engineering investigation;
Basic conditions such as the riverbed that the interval shield tunnel of investigation through section need pass through, earthing, as: the discrepancy in elevation of shield tunnel apex distance planning river bed, shield tunnel apart from the soil property on the length of the discrepancy in elevation of present situation river bed, the interval shield tunnel of through section and width, through section stratum etc.;
The second, analogy, the computational analysis of wearing the riverbed down:
On investigation gained related data basis, according to shield-tunneling construction characteristics and tunnel two lines intersection influence each other degree numerical simulation analysis and model testing, carry out class computational analysis when, reach designing requirement for guaranteeing through section constructing tunnel quality, draft the construction control benchmark, mainly comprise:
Ground settlement changes (accumulative total settling amount, the rate of settling),
Tunnel (ring plate) sedimentation, displacement (accumulative total variable quantity, the rate of settling),
Variation (accumulative total length of side variable quantity, rate of change) is radially restrained in the tunnel,
Deep soil body deformability (accumulative total maximum displacement and rate of displacement, the maximum delaminating deposition amount of accumulative total and the rate of settling) etc.;
The 3rd, project study and definite, determine ancillary method and just establish shield structure parameter:
(1), ancillary method mainly comprises the face of land, stratum ancillary method and section of jurisdiction ancillary method etc.:
1. the face of land, stratum ancillary method mainly comprise:
(a), ground stabilization:
For the construction safety of shallow earthing section and tunnel safety in operation stage, all adopt deep water earth agitation pile strengthening stratum at the section of wearing tunnel top down apart from the paragraph of planning riverbed thickness of earth covering below 5m, the agitation pile top reaches the planning riverbed and gets final product;
Index after the ground stabilization is: unconfined compression strength qu 〉=0.8MPa, coefficient of permeability K≤1 * 10
-8Cm/s;
(b), the anti-floating plate is set:
Shield machine comes back in the shallow earthing section riverbed shield structure progradation in order to prevent from down to wear, and is planning that riverbed surface pours into the concrete anti-floating plate of thick 50cm, and φ 600 boring uplift piles are established in anti-floating plate both sides, and stake is long to be 15m under the plate; If the top longeron is connected as a single entity bored pile and guard shield;
(c), face of land ballast:
The preceding paragraph to the not enough shield structure of the local earthing of existing riverbed section diameter D of construction adopts packed slag or yellow sand ballast, and to increase thickness of earth covering, the conversion thickness of earth covering is answered 〉=1D; Can pass through the shield structure after waiting to satisfy the earthing requirement; After constructing tunnel is finished, treat that grouting serous fluid reaches design strength in the hole after, unload the top ballast by stages, simultaneously tunnel deformation, protuberance are monitored, and adjust discharge time and unloading value according to monitoring result;
Face of land ballast scope comprises:
Laterally: with the tunnel center line is the center, and left and right sides width is according to the tunnel width adjustment; Vertically: whole section of shallow earthing section;
2. the section of jurisdiction ancillary method is mainly: when the shield structure passed through the riverbed, shield tail oil fat pressure injection put in place to guarantee the sealing of shield tail; If shield tail sealing existing problems also can be pasted sponge at every endless tube sheet back side;
(2), shield driving parameter is just established as follows:
1. soil pressure:
Under measure the river bed depth of water when wearing the riverbed, check the thickness of tunnel overburden layer, calculate the setting soil pressure, its undulating value is controlled in the 0.02MPa;
2. the amount of being unearthed control:
The control shield structure amount of being unearthed can not be backbreak, and owes to dig to be controlled in 3%, looks the monitoring situation simultaneously and rationally adjusts the amount of being unearthed;
3. fltting speed:
Evenly advance continuously, fltting speed is controlled at 2-3cm/min;
4. grouting amount:
The synchronous grouting amount just is made as 2.6～2.8m
3/ ring, slurry consistency 9～11cm, synchronous grouting pressure are generally than the big 0.1-0.2MPa of positive soil pressure;
Every assembly unit two rings promptly carry out coagulating compound morning slurries secondary pressure injection to back two endless tube sheets; Secondary grouting pressure is controlled at below the 0.5Mpa; Flow rate of grouting is controlled at 10～15L/min, the about 0.5m of grouting amount
3/ ring;
5. pipe sheet assembling:
Through seam assembling is adopted in the section of jurisdiction, and " assembly unit placed in the middle " taked in strictness; When correction can't be satisfied in assembly unit and curve section of jurisdiction between two parties, adopt the cork chock to adjust;
6. shield tail waterproof:
When the shield structure passed through the riverbed, shield tail oil fat pressure injection put in place to guarantee the sealing of shield tail, cuts off the rear portion penetrating passage;
The 4th, wear the riverbed shield-tunneling construction down:
Under wear in the riverbed shield-tunneling construction process, adopt situations such as real-time monitoring of computer system omnidistance monitoring tunnel subsidence, displacement, convergence, as sedimentation, displacement, convergence equivalence greater than benchmark, then need in time to optimize the shield-tunneling construction parameter, make it less than benchmark, with strict control construction quality, and guarantee construction safety; Until under wear the construction of riverbed section and finish;
Under wear and should also be noted that axial line control in the riverbed shield-tunneling construction process: shield attitude, section of jurisdiction attitude must be adjusted to the right place before the shield structure enters, note upwards coming back; Forbid under excess correction when wearing the riverbed, the swing of crawling; Retreat when forbidding shield machine propelling and pipe sheet assembling; The section of jurisdiction must strictly be installed between two parties, and the elimination section of jurisdiction is cracked etc., and correction in time; Traverse station of every propelling 5 ring repetition measurements.
Shield tunnel advances and adopts automatic measurement system, and every 3min measures a shield attitude automatically during propelling.
Compared with prior art, the invention has the beneficial effects as follows:
Complete construction technologies such as shallow soil-covered river bed under shield tunnel job practices integrated use theory analysis of the present invention, face of land ballast technology, field measurement technology, the selected technology of shield structure propulsive parameter, applicable to carrying out shield-tunneling construction following shallow soil-covered river bed the grade under the environment, surrounding environment is not impacted, and avoid that upthrow appears in the shield structure in the work progress, phenomenons such as structure floats, leaks, caves in are guaranteed construction safety.
Description of drawings
Fig. 1 is a shallow soil-covered river bed under shield tunnel job practices process flow diagram of the present invention.
The specific embodiment
The present invention is described in further detail below in conjunction with the specific embodiment.
But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment.
Embodiment
Present embodiment is the job practices at No. 9 line first stage of the project of Shanghai Rail Transit R413 bid section shield tunnel (nine booths station-Sapporo station) little Lai port, shield-tunneling construction river crossing, and its technological process specifically comprises following key step as shown in Figure 1:
The first, the engineering investigation:
Investigate the interval shield tunnel of this section and need basic conditions such as the riverbed at little Lai port, river crossing, earthing, wherein:
The discrepancy in elevation of shield tunnel apex distance planning river bed is: upper and lower line is about about 5.1m, and the section line is come in and gone out about about 2.3m in east;
Shield tunnel apart from the discrepancy in elevation of present situation river bed is: upper and lower line is about about 6.6m, and the section line is come in and gone out about about 4.0m in east; The minimum place of thickness of earth covering of i.e. this section shield tunnel apex distance planning river bed only is 2.3m;
The interval shield tunnel that need pass through this riverbed is about 19 meters, and is wide about 13.7 meters;
The interval shield tunnel of this section mainly passes through grey silty clay, gray clay; The stratum major part of the section of coming in and going out line shield driven tunnel crossing is the grey silty clay, and shield structure top is main by the grey flour sand, mainly passes through gray clay at the bottom of the shield structure;
This section soil layer mean specific gravity is 1850kg/m
3
The second, analogy, the computational analysis of wearing the riverbed down:
On investigation gained related data basis, according to the construction characteristic of shield structure small radius, shallow earthing and tunnel two lines intersection influence each other degree numerical simulation analysis and model testing, carry out class computational analysis when, for guaranteeing that this section constructing tunnel quality reaches designing requirement, it is as follows to draft this section constructing tunnel control benchmark:
(1) ground settlement changes: accumulative total settling amount :+10mm～-30mm, the rate of settling: ± 2mm/ time;
(2) tunnel (ring plate) sedimentation, displacement: accumulative total variable quantity: ± 30mm, the rate of settling: ± 3mm/ time;
(3) variation is radially restrained in the tunnel: accumulative total length of side variable quantity: ± 20mm, and rate of change: ± 2mm/ time;
(4) deep soil body deformability:
Displacement: accumulative total peak discharge: ± 30mm, rate of displacement: ± 3mm/d;
Delaminating deposition: accumulative total peak discharge :+10mm～-30mm, the rate of settling: ± 3mm/d;
The 3rd, project study and definite, determine ancillary method and just establish shield structure parameter:
(1), ancillary method mainly comprises the face of land, stratum ancillary method and section of jurisdiction ancillary method etc.:
1. the face of land, stratum ancillary method mainly comprise:
(a), ground stabilization:
For the construction safety of shallow earthing section and tunnel safety in operation stage, all adopt deep water earth agitation pile strengthening stratum at the section of wearing tunnel top down apart from the paragraph of planning riverbed thickness of earth covering below 5m, the agitation pile top reaches the planning riverbed and gets final product;
Index after the ground stabilization is: unconfined compression strength qu 〉=0.8MPa, coefficient of permeability K≤1 * 10
-8M/s;
(b), the anti-floating plate is set:
Shield machine comes back in the shallow earthing section riverbed shield structure progradation in order to prevent from down to wear, and is planning that riverbed surface pours into the concrete anti-floating plate of thick 50cm, and φ 600 boring uplift piles are established in anti-floating plate both sides, and stake is long to be 15m under the plate; If the top longeron is connected as a single entity bored pile and guard shield;
(c), face of land ballast:
The preceding paragraph to the not enough shield structure of the local earthing of existing riverbed section diameter D of construction adopts packed slag or yellow sand ballast, and to increase thickness of earth covering, the conversion thickness of earth covering is answered 〉=1D; Can pass through the shield structure after waiting to satisfy the earthing requirement; After constructing tunnel is finished, treat that grouting serous fluid reaches design strength in the hole after, unload the top ballast by stages, simultaneously tunnel deformation, protuberance are monitored, and adjust discharge time and unloading value according to monitoring result;
Face of land ballast scope comprises:
Laterally: with the tunnel center line is the center, each side 6m, wide 12m altogether; Vertically: whole section of shallow earthing section;
2. the section of jurisdiction ancillary method is mainly: when the shield structure passed through the riverbed, shield tail oil fat pressure injection put in place to guarantee the sealing of shield tail; During shield tail sealing existing problems, paste sponge at every endless tube sheet back side;
(2), shield driving parameter is just established as follows:
1. soil pressure:
Under measure the river bed depth of water when wearing the riverbed, check the thickness of tunnel overburden layer, calculate the setting soil pressure, its undulating value is controlled in the 0.02MPa;
2. the amount of being unearthed control:
The control shield structure amount of being unearthed can not be backbreak, and owes to dig to be controlled in 3%, looks the monitoring situation simultaneously and rationally adjusts the amount of being unearthed;
3. fltting speed:
Evenly advance continuously, fltting speed is controlled at 2-3cm/min;
4. grouting amount:
The synchronous grouting amount just is made as 2.6～2.8m
3/ ring, slurry consistency 9～11cm, synchronous grouting pressure are generally than the big 0.1-0.2MPa of positive soil pressure;
Every assembly unit two rings promptly carry out coagulating compound morning slurries secondary pressure injection to back two endless tube sheets; Secondary grouting pressure is controlled at below the 0.5Mpa; Flow rate of grouting is controlled at 10～15L/min, the about 0.5m of grouting amount
3/ ring;
5. pipe sheet assembling:
Through seam assembling is adopted in the section of jurisdiction, and " assembly unit placed in the middle " taked in strictness; When correction can't be satisfied in assembly unit and curve section of jurisdiction between two parties, adopt the cork chock to adjust;
6. shield tail waterproof:
When the shield structure passed through the riverbed, shield tail oil fat pressure injection put in place to guarantee the sealing of shield tail, cuts off the rear portion penetrating passage;
The 4th, wear the riverbed shield-tunneling construction down:
Under wear in the riverbed shield-tunneling construction process, adopt situations such as real-time monitoring of computer system omnidistance monitoring tunnel subsidence, displacement, convergence, as sedimentation, displacement, convergence equivalence greater than benchmark, then need in time to optimize the shield-tunneling construction parameter, make it less than benchmark, with strict control construction quality, and guarantee construction safety; Until under wear the construction of riverbed section and finish;
Under wear and note axial line control in the riverbed shield-tunneling construction process: before the shield structure enters shield attitude, section of jurisdiction attitude are adjusted to the right place, note upwards not coming back; Not under excess correction when wearing the riverbed, the swing of crawling; When shield machine propelling and pipe sheet assembling, do not retreat; Strict placed in the middle installation the in section of jurisdiction, the elimination section of jurisdiction is cracked etc., and correction in time; Traverse station of every propelling 5 ring repetition measurements; Shield tunnel advances and adopts automatic measurement system, and every 3min measures a shield attitude automatically during propelling.
Claims (3)
1. shallow soil-covered river bed under shield tunnel job practices comprises following key step:
The first, the engineering investigation;
The second, analogy, the computational analysis of wearing the riverbed down;
The 3rd, project study and definite, determine ancillary method and just establish shield structure parameter:
(1), ancillary method mainly comprises the face of land, stratum ancillary method and section of jurisdiction ancillary method:
1. the face of land, stratum ancillary method mainly comprise:
(a), ground stabilization:
For the construction safety of shallow earthing section and tunnel safety in operation stage, all adopt deep water earth agitation pile strengthening stratum at the section of wearing tunnel top down apart from the paragraph of planning riverbed thickness of earth covering below 5m, the agitation pile top reaches the planning riverbed and gets final product;
Index after the ground stabilization is: unconfined compression strength qu 〉=0.8MPa, coefficient of permeability K≤1 * 10
-8Cm/s;
(b), the anti-floating plate is set:
Shield machine comes back in the shallow earthing section riverbed shield structure progradation in order to prevent from down to wear, and is planning that riverbed surface pours into the concrete anti-floating plate of thick 50cm, and φ 600 boring uplift piles are established in anti-floating plate both sides, and stake is long to be 15m under the plate; If the top longeron is connected as a single entity bored pile and guard shield;
(c), face of land ballast:
The preceding paragraph to the not enough shield structure of the local earthing of existing riverbed section diameter D of construction adopts packed slag or yellow sand ballast, and to increase thickness of earth covering, the conversion thickness of earth covering is answered 〉=1D; Can pass through the shield structure after waiting to satisfy the earthing requirement; After constructing tunnel is finished, treat that grouting serous fluid reaches design strength in the hole after, unload the top ballast by stages, simultaneously tunnel deformation, protuberance are monitored, and adjust discharge time and unloading value according to monitoring result;
Face of land ballast scope comprises:
Laterally: with the tunnel center line is the center, and left and right sides width is according to the tunnel width adjustment; Vertically: whole section of shallow earthing section;
2. the section of jurisdiction ancillary method is mainly: when the shield structure passed through the riverbed, shield tail oil fat pressure injection put in place to guarantee the sealing of shield tail; If shield tail sealing existing problems are pasted sponge at every endless tube sheet back side;
(2), shield driving parameter is just established as follows:
1. soil pressure:
Under measure the river bed depth of water when wearing the riverbed, check the thickness of tunnel overburden layer, calculate the setting soil pressure, its undulating value is controlled in the 0.02MPa;
2. the amount of being unearthed control:
The control shield structure amount of being unearthed can not be backbreak, and owes to dig to be controlled in 3%, looks the monitoring situation simultaneously and rationally adjusts the amount of being unearthed;
3. fltting speed:
Evenly advance continuously, fltting speed is controlled at 2-3cm/min;
4. grouting amount:
The synchronous grouting amount just is made as 2.6～2.8m
3/ ring, slurry consistency 9～11cm, the big 0.1-0.2MPa of the positive soil pressure of synchronous grouting pressure ratio;
Every assembly unit two rings promptly carry out coagulating compound morning slurries secondary pressure injection to back two endless tube sheets; Secondary grouting pressure is controlled at below the 0.5Mpa; Flow rate of grouting is controlled at 10～15L/min, the about 0.5m of grouting amount
3/ ring;
5. pipe sheet assembling:
Through seam assembling is adopted in the section of jurisdiction, and " assembly unit placed in the middle " taked in strictness; When correction can't be satisfied in assembly unit and curve section of jurisdiction between two parties, adopt the cork chock to adjust;
6. shield tail waterproof:
When the shield structure passed through the riverbed, shield tail oil fat pressure injection put in place to guarantee the sealing of shield tail, cuts off the rear portion penetrating passage;
The 4th, wear the riverbed shield-tunneling construction down:
Under wear in the riverbed shield-tunneling construction process, adopt real-time monitoring of computer system omnidistance monitoring tunnel subsidence, displacement, convergence situation; Sedimentation, displacement, convergency value are in time optimized the shield-tunneling construction parameter during greater than benchmark, make it less than benchmark; Until under wear the construction of riverbed section and finish;
Before entering, the shield structure shield attitude, section of jurisdiction attitude must be adjusted to the right place; Upwards come back when passing through the riverbed, not under excess correction when wearing the riverbed, the swing of crawling; When shield machine propelling and pipe sheet assembling, do not retreat; Strict placed in the middle installation the in section of jurisdiction, the elimination section of jurisdiction is cracked, and correction in time; Traverse station of every propelling 5 ring repetition measurements.
2. shallow soil-covered river bed under shield tunnel job practices according to claim 1 is characterized in that: the slurry constituents and the proportioning of " secondary grouting " are in described " shield driving parameter ":
Cement: calcium chloride: water glass=30: 1: 1, water/binder ratio are 0.6.
3. shallow soil-covered river bed under shield tunnel job practices according to claim 1, it is characterized in that: in described " wearing the riverbed shield-tunneling construction down " process, shield tunnel advances and adopts automatic measurement system, and every 3min measures a shield attitude automatically during propelling.
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| CN200710050176A CN100580221C (en) | 2007-10-09 | 2007-10-09 | Construction method for shallow soil-covered river bed under shield tunnel |
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| CN200710050176A CN100580221C (en) | 2007-10-09 | 2007-10-09 | Construction method for shallow soil-covered river bed under shield tunnel |
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2007
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| CN101672182B (en) * | 2009-10-22 | 2011-09-07 | 上海市第二市政工程有限公司 | Method for leading shield to pass through underground structure |
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| CN102312673B (en) * | 2010-07-09 | 2013-10-23 | 上海市基础工程集团有限公司 | Construction method for allowing shield to pass through operated subway tunnel in short distance under complex working conditions |
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| CN103195435B (en) * | 2013-03-22 | 2015-04-08 | 同济大学 | Method for preventing shield penetration of building compact district from inducing ground subsidence |
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| CN108022027B (en) * | 2018-02-06 | 2021-06-25 | 苏交科集团股份有限公司 | Prediction method for soil output when shield passes through surrounding rock contact zone |
| CN108625864A (en) * | 2018-03-22 | 2018-10-09 | 深圳市市政设计研究院有限公司 | A kind of shield construction method for wearing shallow embedding waters tunnel |
| CN108590678A (en) * | 2018-04-08 | 2018-09-28 | 中交公局桥隧工程有限公司 | Based on the construction method for wearing multiply road railway under shallow embedding Soft Soil Layer earth pressure balanced shield, EPBS |
| CN108533277A (en) * | 2018-04-12 | 2018-09-14 | 中启胶建集团有限公司 | Major diameter slurry shield passes through shanty town settlement Control construction over long distances under the conditions of non-reinforced |
| CN108533277B (en) * | 2018-04-12 | 2020-07-24 | 中启胶建集团有限公司 | Sedimentation control construction method for long-distance penetration of large-diameter slurry shield through shed area under non-reinforced condition |
| CN108978645A (en) * | 2018-08-21 | 2018-12-11 | 中铁九局集团第四工程有限公司 | Rich water sandy gravel shallow embedding riverbed uplift pile anti-floating plate reinforced construction method is worn under shield |
| CN109519184A (en) * | 2018-10-22 | 2019-03-26 | 中铁建大桥工程局集团第二工程有限公司 | A kind of construction method of advance borehole control attitude of shield machine drift |
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| 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 |
| CN110792443A (en) * | 2019-11-25 | 2020-02-14 | 中铁隧道局集团有限公司 | Construction method for shield tunnel to penetrate through seabed shallow covered silt and silt clay |
| CN110985021A (en) * | 2019-12-12 | 2020-04-10 | 中铁十二局集团第二工程有限公司 | Long-distance river-crossing construction method for earth pressure balance shield |
| CN110985021B (en) * | 2019-12-12 | 2022-02-15 | 中铁十二局集团第二工程有限公司 | Long-distance river-crossing construction method for earth pressure balance shield |
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| CN113006808A (en) * | 2021-04-23 | 2021-06-22 | 中铁六局集团有限公司交通工程分公司 | Construction method for viscous geological shield initial section to penetrate shallow soil-covered river channel downwards |
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| CN113818889A (en) * | 2021-09-01 | 2021-12-21 | 宁波市轨道交通集团有限公司 | Construction method for subway shield tunnel to cross and penetrate civil air defense tunnel |
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| CN113847042B (en) * | 2021-09-01 | 2023-07-21 | 宁波市轨道交通集团有限公司 | Construction method for side-penetrating high-voltage electric tower of subway shield tunnel |
| CN113818889B (en) * | 2021-09-01 | 2023-08-18 | 宁波市轨道交通集团有限公司 | Construction method for crossing underground shield tunnel through civil air defense roadway |
| CN113931648A (en) * | 2021-10-13 | 2022-01-14 | 中交天和机械设备制造有限公司 | Control system for automatically adjusting posture of shield tunneling machine |
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Address after: No. 16, Jinniu District Road, Jinniu District Road, Chengdu, Sichuan Patentee after: China Railway No. 2 Engineering Group Co., Ltd. Address before: No. 16, Jinniu District Road, Jinniu District Road, Chengdu, Sichuan Patentee before: CHINA RAILWAY NO.2 BUREAU ENGINEERING CO., LTD. |