CN101571044A - Subway shield gas tunnel construction method - Google Patents
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Abstract
本发明公开了一种地铁盾构瓦斯隧道施工方法，该方法包括以下步骤：一、将所施工的瓦斯隧道从头至尾分为一个或多个有害气体压力区段；二、按照所施工瓦斯隧道的施工工序依次对各有害气体压力区段分别进行施工，一有害气体压力区段的施工过程如下：计算极限瓦斯涌出量并相应判定瓦斯隧道等级，对盾构机的防爆性能、通风系统的通风量及瓦斯监测控制系统进行改造；设定盾构机的掘进速度；盾构掘进施工；管片拼装衬砌施工；三、施工完成所施工瓦斯隧道的所有有害气体压力区段直至实现所施工瓦斯隧道的贯通。本发明设计巧妙合理、实施方便、施工难度小且施工效果好，能有效解决穿越瓦斯储气层的盾构隧道即地铁盾构瓦斯隧道的安全施工问题。
The invention discloses a method for constructing a subway shield gas tunnel. The method comprises the following steps: 1. dividing the constructed gas tunnel into one or more harmful gas pressure sections from the beginning to the end; The construction process of each harmful gas pressure section is carried out in turn. The construction process of a harmful gas pressure section is as follows: calculate the limit gas emission and determine the gas tunnel level accordingly, which will affect the explosion-proof performance of the shield machine and the ventilation system. Renovation of the ventilation volume and gas monitoring and control system; setting the tunneling speed of the shield machine; shield tunneling construction; The penetration of the tunnel. The invention has ingenious and reasonable design, convenient implementation, low construction difficulty and good construction effect, and can effectively solve the safety construction problem of the shield tunnel passing through the gas storage layer, that is, the subway shield gas tunnel.
Description
Technical field
The invention belongs to shield construction subway tunnel technical field, especially relate to a kind of subway shield gas tunnel construction method.
Background technology
Along with Chinese economic development and quickening of urbanization process, the pressure of urban traffic further highlights, and underground rail traffic has at present become the main flow direction of Traffic Development.Yet at present in the flourishing coastal Yangtze River Delta city of China's economy (such as Shanghai, Hangzhou, Ningbo, Suzhou) and the underground shallow-layer pernicious gas of finding in the subway engineering prospecting process in city, landlocked great rivers basin (biogas) become a harm in the subway construction.
With Wuhan City's key construction project is that its subway engineering is that example describes, No. two lines of its Wuhan subway are first subway engineering of Wuhan City, model Chinese running tunnel also is the experimental section of No. two lines of Wuhan subway simultaneously, interval left line length 1010m, right line length 1007m, tunnel single line length overall 2017m (having comprised a service channel) adopts shield construction.Simultaneously, model Chinese running tunnel is external diameter 6m, single hole circular tunnel of internal diameter 5.4m and the lining cutting of employing pipe sheet assembling, section of jurisdiction ring width 1.5m, 10～16 meters of section of jurisdiction concrete C50, S12 edpth of tunnels.Stipulate according to " railway gas tunnel technical specification ": in railway tunnel exploration and the work progress, detect by geological prospecting or construction and to show and have gas in the tunnel, this tunnel should be decided to be gas tunnel, therefore, to be defined as gas tunnel be sure to the subway tunnel that the shield structure is passed through the gas stratum.Model Chinese running tunnel is the shield tunnel that the domestic first bar directly passes through the gas gas-bearing reservoir, and before this, the relevant construction experience of domestic nothing can be followed, and for similar gas tunnel, the following job practices of main at present employing is constructed:
(1) change designed lines: promptly directly change existing designed lines, get around the gas gas-bearing reservoir.The shortcoming that this method exists is: because No. two line design stages of Wuhan subway are not considered the interval underground methane gas that exists of the model Chinese, in case the change designed lines, subway No. two lines in then whole Wuhan all will be affected, and economic loss is huge, expends long in time limit.
(2) adopt cut and cover tunneling: promptly adopt the mode of ground excavation to construct.The shortcoming that this method exists is: the necessary blocked road of cut and cover tunneling, and huge to the urban traffic influence, and the duration is longer, and the construction cost of constructing accordingly also will improve.
(3) surface drilling firedamp drainage: the drawing-off gas hole of promptly in line range, constructing at a certain distance, adopt the precipitation well construction, when drawing water, underground methane gas is discharged outside the tunnel, to reduce the gas density in the stratum.The shortcoming that this method exists is: the gas exhaust DeGrain, and the firedamp drainage of face boring simultaneously needs blocked road, and is big to traffic impact, is difficult to carry out traffic and leads and change, and it is big to implement difficulty.
Summary of the invention
Technical problem to be solved by this invention is at above-mentioned deficiency of the prior art, a kind of subway shield gas tunnel construction method is provided, its design is ingenious rationally, enforcement is convenient, difficulty of construction is little and construction effect good, and can effectively solve the shield tunnel that passes through the gas gas-bearing reservoir is the safe construction problem of subway shield gas tunnel.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of subway shield gas tunnel construction method is characterized in that this method may further comprise the steps:
Step 1, gas pressure value and pore air pressure value by the gas tunnel of constructing that geological mapping is measured compare, the gas tunnel of being constructed from first to last is divided into one or more pernicious gas pressure sections, described pernicious gas pressure section comprise gas pressure greater than pore air pressure section and gas pressure less than two types of pore air pressure sections;
Step 2, successively each pernicious gas pressure section is constructed respectively according to the working procedure of construction gas tunnel, for a pernicious gas pressure section, its work progress may further comprise the steps:
(1) preparation before the construction, its set-up procedure is as follows:
101, according to formula
Calculate the limit gas emission Q of the pernicious gas pressure section of constructing, be i.e. pour into the gas amount in digging space in the unit interval, and the corresponding driving speed v of shield machine and the corresponding relation between limit gas emission Q set up;
In the formula: v---the driving speed of shield machine, mm/min; S---the excavated section area of the gas tunnel of constructing, m
2The porosity maximum value of the soil layer of all soil layer type mesopore rate maximums that ξ---the gas tunnel of constructing passes through is an extreme value, %; P---the gas pressure value of the actual measurement gas tunnel maximum of constructing, MPa; Pst---standard atmospheric pressure, MPa; A---consider the safety factor of moulding tunnel effusion pernicious gas behind described shield machine shield tail and the driving, K---consider the difference of soil body gas release coefficient in the stratum that the gas tunnel of constructing passes through and inhomogeneities that gas discharges and the gas that is provided with gush out coefficient and A * K=1.2;
102, judge the gas tunnel grade of the pernicious gas pressure section of constructing: with limit gas emission Q=Q
0=0.5 ± 0.02m
3/ min is criterion, and (1-1) calculates Q according to formula
0The driving speed v of corresponding shield machine
0: as the driving speed v＜v of shield machine
0The time, the pernicious gas pressure section of being constructed is the present low gas tunnel; Driving speed v＞v when shield machine
0The time, the pernicious gas pressure section of being constructed is high gas tunnel;
103, according to the gas tunnel grade of the pernicious gas pressure section of constructing that is determined, and in conjunction with " railway gas tunnel technical specification ", the explosion-proof performance of the reply shield machine that adopts, the ventilation and the gas monitor control system of ventilation system are transformed mutually, the strict simultaneously burning things which may cause a fire disaster that may occur when constructing of controlling finally reaches the purpose that prevents the generation of gas disaster accident by improving the equipment explosion-proof performance, reduce methane gas concentration and controlling burning things which may cause a fire disaster;
104, setting the driving speed v of shield machine, the pernicious gas pressure section of being constructed is defined as the present low gas tunnel conditionally, specifically is that the driving speed v with shield machine is limited to v
0Below, thereby reach the purpose that prevents that further the gas disaster accident from taking place;
(2) shield driving construction: adopt improved shield machine, ventilation system and gas monitor control system and shield machine driving speed v in the step 103, the pernicious gas pressure section of being constructed is constructed according to conventional shield driving construction technology to set in the step 104; In the tunneling construction process, strict control shield structure spiral is unearthed, the quality of the sealing of shield tail, synchronous grouting and secondary grouting, is released into the tunnel in a large number to prevent gas, reduces construction risk;
(3) pipe sheet assembling lining construction: the shield driving construction is carried out the pipe sheet assembling lining construction according to conventional pipe sheet assembling lining construction technology after finishing a ring again; Constantly circulation, the integral construction of the pernicious gas pressure section of constructing until finishing; In the pipe sheet assembling lining construction process, need the quality of strict guarantee pipe sheet assembling;
Step 3, finish all pernicious gas pressure sections of the gas tunnel of constructing according to step 2 construction, until the perforation of the realization gas tunnel of constructing.
During described shield machine is transformed described in the above-mentioned steps 103, directly adopt the high relatively shield machine of explosion-proof performance grade, perhaps undertaken coming into operation again behind the local flow improvement by shield machine to existing non-explosion-proof type; Local flow improvement to the shield machine that has non-explosion-proof type now carries out comprises that mainly all electrical connectors to described shield machine carry out encapsulation process, electric control box is carried out explosion-proof processing and at the soil outlet place of shield machine exhaust system is set.
When the ventilation to described ventilation system described in the above-mentioned steps 103 is transformed, the draft type of the ventilation system that adopts is the forced ventilation mode, and the ventilation equipment that adopted comprise the explosion-proof fan of main air blower and a plurality of part that increases the pernicious gas pressure area intersegmental part ventilation of constructing; Described main air blower is big air quantity blower fan or two blower fans that are connected in series mutually; The explosion-proof fan in described part is installed in the place of finding to take place the methane gas gathering after field survey of described shield machine and supporting chassis inside, back.
Gas monitor control system described in the above-mentioned steps 103 comprises personal monitoring system and automatic monitoring system;
Described personal monitoring system comprise in the shield driving work progress to the easy habitat of operation area gas, shield machine electronic component aggregation zone and the gas density in the pernicious gas pressure section return of constructing, portable gas explosion detector that detects stage by stage respectively and light dry type gas detector;
Described automatic monitoring system comprises automatic monitoring system one and automatic monitoring system two;
The signal processing circuit one that described automatic monitoring system one comprises many groups gas sensor of being laid in described shield machine and supporting chassis top, back, join with described many group gas sensors, the controller one, the acousto-optic warning unit one that join with described signal processing circuit one and the gauge tap that the conveying worm gate of described shield machine is carried out open and close control, described acousto-optic warning unit one and gauge tap are controlled by described controller one, carry out two-way communication in the heart in described controller one and the gas-monitoring;
Carry out two-way communication in the heart in the signal processing circuit two that described automatic monitoring system two comprises a plurality of infrared methane sensors in the moulding tunnel that evenly is laid in the gas tunnel of constructing, join with described infrared methane sensor, the controller two that joins with described signal processing circuit two and control acousto-optic warning unit two, described controller two and gas-monitoring by described controller two;
After the ventilation to described ventilation system described in the above-mentioned steps 103 is transformed, make the return flow velocity in the pernicious gas pressure section of constructing be not less than 1m/s.
Carrying out shield driving when construction described in the above-mentioned steps (2), by the real-time gas density data that detect of the gas monitor control system described in the step 103, judge when drawing actual absolute gas emission rate less than the limit gas emission Q that calculates in the step 101, then according to difference between actual absolute gas emission rate and limit gas emission Q and convolution (1-1), the driving speed v that tackles shield machine mutually adjusts, and the driving speed v of promptly corresponding raising shield machine is to guarantee construction speed.
Described many group gas sensors comprise a plurality of infrared methane sensors, a plurality of hydrogen sulfide sensor and a plurality of carbon monoxide transducer.
The present invention compared with prior art has the following advantages:
1, design is ingenious, reasonable, the account form of limit gas emission in the shield gas tunnel has creatively been proposed, and can judge the gas grade of construction gas tunnel exactly with reference to the aforementioned calculation formula, and, the follow-up construction of gas tunnel is instructed with reference to " railway gas tunnel technical specification ".
2, construction cost is low, gas grade according to the gas tunnel of constructing that is determined, the existing Suporting structure that is adopted in the construction is carried out correspondingly local flow improvement, simultaneously the ventilation and the gas monitor control system of ventilation system are carried out corresponding transformation, and the strict burning things which may cause a fire disaster that may occur when constructing of controlling promptly mainly reaches the purpose that prevents the generation of gas disaster accident by improving the equipment explosion-proof performance, reduce methane gas concentration and controlling burning things which may cause a fire disaster.
3, by setting the driving speed of shield machine, the pernicious gas pressure section of being constructed being defined as the present low gas tunnel conditionally, specifically is that the driving speed v with shield machine is limited to v
0Below, thereby reach the purpose that prevents that further the gas disaster accident from taking place.
4, construction safety, can effectively prevent the generation of gas disaster accident, during concrete construction to strengthen tunnel ventilation, it is auxilliary to strengthen transforming as of other equipment in the sealing of shield tail, shield machine and the tunnel, the aggregate measures that cooperate gas monitoring system and every safety management system guarantee that the safety of constructing carries out smoothly.
5, filled up the blank that domestic subway engineering uses earth pressure balance shield machine tunneling gas stratum, for the shield driving on gas stratum has accumulated a large amount of firsthand information, explored the successful construction experience that the shield structure passes through the gas stratum, for the shield driving on follow-up similar gas stratum provides actual theoretical foundation, have very important in theory and practice significance, have very big application value.
In sum, the present invention design ingenious rationally, implement convenient, difficulty of construction is little and construction effect good, it is on the basis of the shield gas tunnel gas emission account form that is proposed, carry out the local flow improvement of technology preparation and equipment, and cooperate the aggregate measures of gas monitoring system to guarantee that the safety of gas tunnel connects smoothly, thereby the present invention can effectively solve the safe construction problem that the shield tunnel that passes through the gas gas-bearing reservoir is a subway shield gas tunnel.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is a construction flow chart of the present invention.
The specific embodiment
As shown in Figure 1, subway shield gas tunnel construction method of the present invention may further comprise the steps:
Step 1, gas pressure value and pore air pressure value by the gas tunnel of constructing that geological mapping is measured compare, the gas tunnel of being constructed from first to last is divided into one or more pernicious gas pressure sections, described pernicious gas pressure section comprise gas pressure greater than pore air pressure section and gas pressure less than two types of pore air pressure sections.
In the present embodiment, point out that through the geological mapping report gas tunnel of being constructed is that model Chinese running tunnel is divided into two pernicious gas pressure sections, promptly greater than pore air pressure section (I district) with less than pore air pressure section (II district), and field investigation result according to the interval underground methane gas of the model Chinese, the limit gas pressure in I district is 0.31Mpa, and the limit gas pressure in II district is 0.23Mpa.
Step 2, successively each pernicious gas pressure section is constructed respectively according to the working procedure of construction gas tunnel, for a pernicious gas pressure section, its work progress may further comprise the steps:
(1) preparation before the construction, its set-up procedure is as follows:
101, according to formula
Calculate the limit gas emission Q of the pernicious gas pressure section of constructing, be i.e. pour into the gas amount in digging space in the unit interval, and the corresponding driving speed v of shield machine and the corresponding relation between limit gas emission Q set up.
In the formula: v---the driving speed of shield machine, mm/min; S---the excavated section area of the gas tunnel of constructing, m
2The porosity maximum value of the soil layer of all soil layer type mesopore rate maximums that ξ---the gas tunnel of constructing passes through is an extreme value, %; P---the gas pressure value of the actual measurement gas tunnel maximum of constructing, MPa; Pst---standard atmospheric pressure, MPa; A---consider the safety factor of moulding tunnel effusion pernicious gas behind described shield machine shield tail and the driving; K---consider the difference of soil body gas release coefficient in the stratum that the gas tunnel of constructing passes through and inhomogeneities that gas discharges and the gas that is provided with gush out coefficient and A * K=1.2.
By formula (1-1) as can be known, the driving speed v of shield machine has determined the size of unearthed amount in the shield tunnel construction, methane gas concentration in the tunnel is directly proportional with the amount of being unearthed, the dregs that is unearthed then is the of paramount importance source of overflowing of gas, so the driving speed v of shield machine is the key influence factor of gas emission.
In addition, because in shield driving stage of shield construction and pipe sheet assembling stage two stages, dregs enters in the tunnel endlessly in the shield driving stage along with the driving of shield machine, the methane gas that is rich in the soil body fully discharges in the tunnel, enter the main path in tunnel for methane gas, the gas infiltration capacity of shield tail place and moulding tunnel seam crossing is less, can ignore.Pipe sheet assembling stage shield machine is in stopped status, does not have dregs to enter in the tunnel, thus when calculating gas emission only the gas emission to the shield driving stage calculate.
During the construction of model Chinese running tunnel, the stratum that its shield machine passed through is followed successively by mud matter farinose argillic horizon, silty clay folder silt and flour sand layer and silty clay, silt and three stratum of flour sand interlayer layer, wherein the porosity of sandy soil layer is the highest, according to the least favorable principle, the sandy soil layer of maximum of selecting porosity ξ for use is as basis of calculation value; Actual measurement shows that the porosity of sandy soil layer is generally 15～25% according to petroleum industry, and get limiting value 30% and calculate this moment.
102, judge the gas tunnel grade of the pernicious gas pressure section of constructing: with limit gas emission Q=Q
0=0.5 ± 0.02m
3/ min is criterion, and (1-1) calculates Q according to formula
0The driving speed v of corresponding shield machine
0: as the driving speed v＜v of shield machine
0The time, the pernicious gas pressure section of being constructed is the present low gas tunnel; Driving speed v＞v when shield machine
0The time, the pernicious gas pressure section of being constructed is high gas tunnel.
In the present embodiment, because model Chinese running tunnel is the shield tunnel that the domestic first bar directly passes through the gas gas-bearing reservoir, the standard that domestic nothing is relevant can be used for reference, therefore with reference to the division principle in " railway gas tunnel technical specification " the interval gas tunnel grade of the model Chinese is judged, and as reference, carry out every preparation of construction work, that is to say Q
0=0.5m
3/ min.
According to the driving speed v difference of shield machine, limit gas emission Q is also inequality in the unit interval, and the statistics that the I district is specifically added up sees Table 1:
Table 1
| Sequence number | Driving speed mm/min | Cross-sectional area m 2 | Porosity % | Gas pressure MPa | Coefficient A * K | Limit gas emission m 3/min | Gas grade 20 |
| 1 | 10 | 30.95 | 0.30 | 0.31 | 1.2 | 0.34 | Low |
| 2 | 14.5 | 30.95 | 0.30 | 0.31 | 1.2 | 0.50 | High |
| 3 | 20 | 30.95 | 0.30 | 0.31 | 1.2 | 0.69 | High |
| 4 | 30 | 30.95 | 0.30 | 0.31 | 1.2 | 1.03 | High |
| 5 | 40 | 30.95 | 0.30 | 0.31 | 1.2 | 1.38 | High 25 |
| 6 | 50 | 30.95 | 0.30 | 0.31 | 1.2 | 1.72 | High |
The statistics that the II district is specifically added up sees Table 2:
Table 2
| Sequence number | Driving speed mm/min | Cross-sectional area m 2 | Porosity % | Gas pressure MPa | Coefficient A * K | Limit gas emission m 3/min | The gas class 5 |
| 1 | 10 | 30.95 | 0.30 | 0.23 | 1.2 | 0.26 | Low |
| 2 | 14.5 | 30.95 | 0.30 | 0.23 | 1.2 | 0.37 | Low |
| 3 | 20 | 30.95 | 0.30 | 0.23 | 1.2 | 0.51 | High |
| 4 | 30 | 30.95 | 0.30 | 0.23 | 1.2 | 0.77 | High 10 |
| 5 | 40 | 30.95 | 0.30 | 0.23 | 1.2 | 1.02 | High |
| 6 | 50 | 30.95 | 0.30 | 0.23 | 1.2 | 1.28 | High |
Result of calculation according to table 1 and table 2: be defined as the present low gas tunnel when driving speed v is lower than 14.5mm/min in the I district, be defined as high gas tunnel when being higher than 14.5mm/min.Be defined as the present low gas tunnel when driving speed v is lower than 20mm/min in the II district, be defined as high gas tunnel when being higher than 20mm/min.
103, according to the gas tunnel grade of the pernicious gas pressure section of constructing that is determined, and in conjunction with " railway gas tunnel technical specification ", the explosion-proof performance of the reply shield machine that adopts, the ventilation and the gas monitor control system of ventilation system are transformed mutually, the strict simultaneously burning things which may cause a fire disaster that may occur when constructing of controlling finally reaches the purpose that prevents the generation of gas disaster accident by improving the equipment explosion-proof performance, reduce methane gas concentration and controlling burning things which may cause a fire disaster.
When described shield machine is transformed, directly adopt the high relatively shield machine of explosion-proof performance grade, perhaps undertaken coming into operation again behind the local flow improvement by shield machine to existing non-explosion-proof type.For reducing construction cost, usually adopt the mode of the shield machine of existing non-explosion-proof type being carried out local flow improvement, the local flow improvement that carries out comprises that mainly all electrical connectors to described shield machine carry out encapsulation process, electric control box is carried out explosion-proof processing and at the soil outlet place of shield machine exhaust system is set.
When the ventilation of described ventilation system is transformed, the draft type of the ventilation system that adopts is the forced ventilation mode, and the ventilation equipment that adopted comprise the explosion-proof fan of main air blower and a plurality of part that increases the pernicious gas pressure area intersegmental part ventilation of constructing.Described main air blower is big air quantity blower fan or two blower fans that are connected in series mutually.The explosion-proof fan in described part is installed in the place of finding to take place the methane gas gathering after field survey of described shield machine and supporting chassis inside, back.
In the present embodiment, adopt two blower fans to carry out tunnel ventilation, as the major measure of preventing gas density to exceed standard with the relay form.The local explosion-proof fan of being installed in shield machine and supporting chassis inside, back prevents that gas is in local accumulation.And, after the ventilation of described ventilation system transformed, make the return flow velocity in the pernicious gas pressure section of constructing be not less than 1m/s.
Described gas monitor control system comprises personal monitoring system and automatic monitoring system.Described personal monitoring system comprise in the shield driving work progress to the easy habitat of operation area gas, shield machine electronic component aggregation zone and gas density, the portable gas explosion detector that detects stage by stage respectively and the light dry type gas detector in the pernicious gas pressure section return of constructing.
Described automatic monitoring system comprises automatic monitoring system one and automatic monitoring system two.The signal processing circuit one that described automatic monitoring system one comprises many groups gas sensor of being laid in described shield machine and supporting chassis top, back, join with described many group gas sensors, the controller one, the acousto-optic warning unit one that join with described signal processing circuit one and the gauge tap that the conveying worm gate of described shield machine is carried out open and close control, described acousto-optic warning unit one and gauge tap are controlled by described controller one, carry out two-way communication in the heart in described controller one and the gas-monitoring.Described many group gas sensors comprise a plurality of infrared methane sensors, a plurality of hydrogen sulfide sensor and a plurality of carbon monoxide transducer.Carry out two-way communication in the heart in the signal processing circuit two that described automatic monitoring system two comprises a plurality of infrared methane sensors in the moulding tunnel that evenly is laid in the gas tunnel of constructing, join with described infrared methane sensor, the controller two that joins with described signal processing circuit two and control acousto-optic warning unit two, described controller two and gas-monitoring by described controller two.
That is to say, in the present embodiment, adopt manual monitoring and monitor the monitoring scheme that combines automatically.Concrete installation one a cover watt electric locking monitoring system is an automatic monitoring system one in the gas tunnel, on the supporting chassis of shield machine and back 10 infrared methane sensors, 3 hydrogen sulfide sensors and 3 carbon monoxide transducers are set altogether, thereby can realize the real-time measurement of tunnel gas concentration, show and function such as the sound and light alarm that transfinites on the spot, and can convert tunnel gas concentration to the standard electric signal continuously and automatically and flow to the gas-monitoring center, to reach the purpose of control shield machine power supply.When any point infrared methane sensor reaches alarming value, monitor control system specifically is the control instruction that controller one sends alarm signal and associate device, and the described conveying worm gate of emergency cut-off stops shield driving.
Described automatic monitoring system two is included in specifically that every 100m installs one infrared methane sensor in the described moulding tunnel, and this monitoring system can convert gas density in the tunnel to the standard electric signal continuously and automatically and carry the gas-monitoring center, and the gas-monitoring center is provided with station, model lake top board.The gas density of surveying when any point infrared methane sensor reaches alarming value, and second automatic monitoring system can send the control instruction of alarm signal and associate device immediately, and starts the locking emergency function.
For the personal monitoring system, every shift arranges the frequency 12 hour continuous parallel detection of two watts of inspection persons with 30min, in time reports and carry out file record.Manual detection is to effectively the replenishing of automatic gas detection system, and adopts monitoring scheme that both combine to guarantee construction safety.
To sum up, when the ventilation of the explosion-proof performance of employing shield machine, ventilation system and gas monitor control system are transformed, for reaching the purpose of stopping the gas disaster accident, the trigger condition of reply accident is controlled, and promptly the methane gas disaster accident must reach three necessary conditions: the first, certain airtight space; The second, methane gas concentration reaches 1～5% (burning); Methane gas concentration reaches 5～16% (blasts); Three, trigger point, burning things which may cause a fire disaster are controlled.
For model Chinese running tunnel, the methane gas blast must reach above-mentioned three necessary conditions being embodied as in shield construction: shield tunnel is the circular tunnel of concrete pipe sheet assembly unit lining cutting, and spatial dimension is little, and can not enlarge; Reducing the interior whole methane gas concentration of shield tunnel can be by strengthening tunnel ventilation, and measures such as enhancing tunnel overall tightness realize; Because apart from the face 80m scope be shield structure electric fixtures compact district, and shield machine spiral soil outlet position also is in this zone as the source that gushes out of main gas in the tunnel, therefore apart from the face 80m scope for preventing and treating the emphasis of gas disaster.In the present embodiment, mainly control, guarantee carrying out smoothly of shield driving from reducing in the tunnel gas gas concentration and control burning things which may cause a fire disaster two aspects.
104, setting the driving speed v of shield machine, the pernicious gas pressure section of being constructed is defined as the present low gas tunnel conditionally, specifically is that the driving speed v with shield machine is limited to v
0Below, thereby reach the purpose that prevents that further the gas disaster accident from taking place.
In the practice, when employed shield machine can't carry out explosion-proof transformation owing to reasons such as technology, then adopt the method that the pernicious gas pressure section of being constructed is defined as conditionally the present low gas tunnel,
" railway gas tunnel technical specification " regulation, the electric fixtures in present low gas work area and Work machine can use non-explosion-proof type in the tunnel, therefore under the situation of artificial control driving speed, we can be with the interval present low gas tunnel that is defined as with good conditionsi of the model Chinese, and with this basis, for the shield gas tunnel safe construction provides foundation as the research of the interval gas tunnel construction technology of the model Chinese.
(2) shield driving construction: adopt improved shield machine, ventilation system and gas monitor control system and shield machine driving speed v in the step 103, the pernicious gas pressure section of being constructed is constructed according to conventional shield driving construction technology to set in the step 104; In the tunneling construction process, strict control shield structure spiral is unearthed, the quality of the sealing of shield tail, synchronous grouting and secondary grouting, is released into the tunnel in a large number to prevent gas, reduces construction risk.
During the shield driving construction,, judge that drawing actual absolute gas emission rate (pours into the gas amount in digging space, be called absolute gas emission rate, use m in the unit interval by the real-time gas density data that detect of the gas monitor control system described in the step 103
3/ min represents) during less than the limit gas emission Q that calculates in the step 101, then according to difference between actual absolute gas emission rate and limit gas emission Q and convolution (1-1), the driving speed v that tackles shield machine mutually adjusts, and the driving speed v of promptly corresponding raising shield machine is to guarantee construction speed.
(3) pipe sheet assembling lining construction: the shield driving construction is carried out the pipe sheet assembling lining construction according to conventional pipe sheet assembling lining construction technology after finishing a ring again; Constantly circulation, the integral construction of the pernicious gas pressure section of constructing until finishing.In the pipe sheet assembling lining construction process, need the quality of strict guarantee pipe sheet assembling.
Step 3, finish all pernicious gas pressure sections of the gas tunnel of constructing according to step 2 construction, until the perforation of the realization gas tunnel of constructing.
In addition, according to the high risk construction characteristic of gas tunnel, and actual conditions in conjunction with shield-tunneling construction, work out multinomial gas tunnel safety management system, comprising gate sentry system, the system of getting angry, tool changing system, emergency processing flow or the like open a position, before shield launching, the employee that all takes part in building has been carried out a surname and passed through, and printing is bound into book form separately, provide and give every employee.After safety management system brochure was handed down to each personnel, seminar's tissue was examined every personnel, and the examination qualification rate reaches 100%.
In conjunction with the special constructure scheme of gas tunnel, establishment is respectively " gas explosion safety emergency preplan ", " gas combustion safety emergency preplan ", " poisonous gas poisoning safety emergency preplan " at three safe emergency preplans of gas tunnel construction simultaneously.Before shield launching, all employees that take part in building are giveed training, and in the practice of construction process, back two safe emergency preplans have been carried out repeatedly actual rehearsal, guarantee that the very first time forms effective tissue, the constructor is carried out emergency relief, every economic loss is controlled at minimum degree.
The above; it only is preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, everyly any simple modification that above embodiment did, change and equivalent structure changed, all still belong in the protection domain of technical solution of the present invention according to the technology of the present invention essence.
Claims (7)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100229575A CN101571044B (en) | 2009-06-16 | 2009-06-16 | Subway shield gas tunnel construction method |
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| CN102128034A (en) * | 2011-01-27 | 2011-07-20 | 同济大学 | Methane safe control method for tunneling methane stratum-containing tunnel shield |
| CN103266896A (en) * | 2013-05-24 | 2013-08-28 | 上海市城市建设设计研究总院 | Construction method for shield tunneling machine retaining structure taking position firstly and being constructed secondly and for shield shaft excavation |
| CN103696806A (en) * | 2013-12-19 | 2014-04-02 | 中铁八局集团有限公司 | Gas tunnel control method and system thereof |
| RU2541342C1 (en) * | 2014-01-30 | 2015-02-10 | Федеральное государственное бюджетное учреждение науки ИНСТИТУТ ПРОБЛЕМ КОМПЛЕКСНОГО ОСВОЕНИЯ НЕДР РОССИЙСКОЙ АКАДЕМИИ НАУК (ИПКОН РАН) | Forecasting method of gas balance of working face |
| CN104747229A (en) * | 2015-02-27 | 2015-07-01 | 神华集团有限责任公司 | Safe mining method of high gas area driving working face in low gas mine |
| RU2564887C1 (en) * | 2014-01-30 | 2015-10-10 | Федеральное государственное бюджетное учреждение науки ИНСТИТУТ ПРОБЛЕМ КОМПЛЕКСНОГО ОСВОЕНИЯ НЕДР РОССИЙСКОЙ АКАДЕМИИ НАУК (ИПКОН РАН) | Method of determination of mine air influx into degassing well |
| CN104989418A (en) * | 2015-04-02 | 2015-10-21 | 四川省交通运输厅公路规划勘察设计研究院 | Tunnel structure for gas tunnel |
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| CN109139083A (en) * | 2018-09-12 | 2019-01-04 | 中国矿业大学 | Shield-tunneling construction tunnel ventilation dilutes the experimental system for simulating for pouring in methane gas |
| CN109209402A (en) * | 2018-10-22 | 2019-01-15 | 中国电建集团铁路建设有限公司 | A kind of present low gas shield tunnel construction method |
| RU2730470C1 (en) * | 2019-06-20 | 2020-08-24 | Федеральное Государственное Бюджетное Учреждение Науки Институт Проблем Комплексного Освоения Недр Им. Академика Н.В. Мельникова Российской Академии Наук (Ипкон Ран) | Method of predicting intensity of releasing methane from coal broken-down in bottomhole |
| RU2731011C1 (en) * | 2019-06-20 | 2020-08-28 | Федеральное Государственное Бюджетное Учреждение Науки Институт Проблем Комплексного Освоения Недр Им. Академика Н.В. Мельникова Российской Академии Наук (Ипкон Ран) | Method for determination of residual methane content of coal beaten in the bottomhole |
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| CN102128034A (en) * | 2011-01-27 | 2011-07-20 | 同济大学 | Methane safe control method for tunneling methane stratum-containing tunnel shield |
| CN103266896B (en) * | 2013-05-24 | 2015-05-20 | 上海市城市建设设计研究总院 | Construction method for shield tunneling machine retaining structure taking position firstly and being constructed secondly and for shield shaft excavation |
| CN103266896A (en) * | 2013-05-24 | 2013-08-28 | 上海市城市建设设计研究总院 | Construction method for shield tunneling machine retaining structure taking position firstly and being constructed secondly and for shield shaft excavation |
| CN103696806B (en) * | 2013-12-19 | 2015-11-11 | 中铁八局集团有限公司 | Gas tunnel prevention and controls and system thereof |
| CN103696806A (en) * | 2013-12-19 | 2014-04-02 | 中铁八局集团有限公司 | Gas tunnel control method and system thereof |
| RU2541342C1 (en) * | 2014-01-30 | 2015-02-10 | Федеральное государственное бюджетное учреждение науки ИНСТИТУТ ПРОБЛЕМ КОМПЛЕКСНОГО ОСВОЕНИЯ НЕДР РОССИЙСКОЙ АКАДЕМИИ НАУК (ИПКОН РАН) | Forecasting method of gas balance of working face |
| RU2564887C1 (en) * | 2014-01-30 | 2015-10-10 | Федеральное государственное бюджетное учреждение науки ИНСТИТУТ ПРОБЛЕМ КОМПЛЕКСНОГО ОСВОЕНИЯ НЕДР РОССИЙСКОЙ АКАДЕМИИ НАУК (ИПКОН РАН) | Method of determination of mine air influx into degassing well |
| CN104747229A (en) * | 2015-02-27 | 2015-07-01 | 神华集团有限责任公司 | Safe mining method of high gas area driving working face in low gas mine |
| CN104989418A (en) * | 2015-04-02 | 2015-10-21 | 四川省交通运输厅公路规划勘察设计研究院 | Tunnel structure for gas tunnel |
| RU2600000C1 (en) * | 2015-04-02 | 2016-10-20 | Федеральное государственное бюджетное учреждение науки ИНСТИТУТ ПРОБЛЕМ КОМПЛЕКСНОГО ОСВОЕНИЯ НЕДР РОССИЙСКОЙ АКАДЕМИИ НАУК (ИПКОН РАН) | Method of stope ore methane balance predicting |
| CN107035403B (en) * | 2016-12-13 | 2019-06-04 | 中铁隧道集团有限公司 | A kind of high methane and the non-explosion-proof flexible transport method in Gas Outburst tunnel |
| CN107035403A (en) * | 2016-12-13 | 2017-08-11 | 中铁隧道集团有限公司 | A kind of non-explosion-proof flexible transport method in high methane and Gas Outburst tunnel |
| CN108222008A (en) * | 2018-01-30 | 2018-06-29 | 中国建筑第八工程局有限公司 | Harmful gases in deep foundation pit processing system and method |
| CN108166982A (en) * | 2018-01-31 | 2018-06-15 | 中铁隧道集团二处有限公司 | A kind of limit alarm device tunneled in shield machine steel bushing |
| CN108166982B (en) * | 2018-01-31 | 2024-04-02 | 中铁隧道集团二处有限公司 | Limiting alarm device for tunneling in steel sleeve of shield tunneling machine |
| CN109026153A (en) * | 2018-08-03 | 2018-12-18 | 中国电建集团铁路建设有限公司 | A kind of pre- prevention and control device of earth pressure balanced shield, EPBS gas |
| CN109139083A (en) * | 2018-09-12 | 2019-01-04 | 中国矿业大学 | Shield-tunneling construction tunnel ventilation dilutes the experimental system for simulating for pouring in methane gas |
| CN109209402B (en) * | 2018-10-22 | 2019-08-20 | 中国电建集团铁路建设有限公司 | A kind of present low gas shield tunnel construction method |
| CN109209402A (en) * | 2018-10-22 | 2019-01-15 | 中国电建集团铁路建设有限公司 | A kind of present low gas shield tunnel construction method |
| RU2730470C1 (en) * | 2019-06-20 | 2020-08-24 | Федеральное Государственное Бюджетное Учреждение Науки Институт Проблем Комплексного Освоения Недр Им. Академика Н.В. Мельникова Российской Академии Наук (Ипкон Ран) | Method of predicting intensity of releasing methane from coal broken-down in bottomhole |
| RU2731011C1 (en) * | 2019-06-20 | 2020-08-28 | Федеральное Государственное Бюджетное Учреждение Науки Институт Проблем Комплексного Освоения Недр Им. Академика Н.В. Мельникова Российской Академии Наук (Ипкон Ран) | Method for determination of residual methane content of coal beaten in the bottomhole |
| CN112554948A (en) * | 2020-12-14 | 2021-03-26 | 中铁第一勘察设计院集团有限公司 | Harmful gas monitoring system for tunnel excavation |
| CN112554948B (en) * | 2020-12-14 | 2023-10-10 | 中铁第一勘察设计院集团有限公司 | Harmful gas monitoring system for tunnel excavation |
| CN113958333A (en) * | 2021-11-29 | 2022-01-21 | 中铁二十局集团第五工程有限公司 | Underground harmful gas prevention and control method for subway tunnel construction for preventing road settlement |
| CN113958333B (en) * | 2021-11-29 | 2023-05-26 | 中铁二十局集团第五工程有限公司 | Underground harmful gas prevention and control method for subway tunnel construction for preventing road settlement |
| CN115163172A (en) * | 2022-08-10 | 2022-10-11 | 河南理工大学 | Advanced pre-extraction rapid coal uncovering method for gas tunnel |
| CN115163172B (en) * | 2022-08-10 | 2023-03-07 | 河南理工大学 | Advanced pre-extraction rapid coal uncovering method for gas tunnel |
| CN115929407A (en) * | 2023-01-03 | 2023-04-07 | 中铁七局集团武汉工程有限公司 | A tunnel gas concentration monitoring method and system |
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