CN115711152A - Tunnel exit work area low-gas section gas comprehensive management construction method - Google Patents
Tunnel exit work area low-gas section gas comprehensive management construction method Download PDFInfo
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Abstract
The invention belongs to the technical field of tunnel construction, and particularly discloses a tunnel exit work area low-gas section gas comprehensive management construction method, which comprises the following steps: s1, advance geological forecast, S2, construction ventilation, S3, gas monitoring, S4, gas drainage, S5 and gas drilling and blasting. The invention provides a scientific solution for the occurrence of gas explosion accidents in the low-gas section, ensures the construction safety of the low-gas tunnel, and has the advantages of less equipment investment, low cost, quick response and powerful safety guarantee.
Description
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to a comprehensive management construction method for low-gas section gas at a tunnel exit work area.
Background
In recent years, with the development of traffic engineering, the construction of gas tunnels is more and more common. The main component of the gas is methane which is colorless, tasteless, inflammable and explosive gas. The gas explosion can generate high-temperature and high-pressure shock waves and emit harmful gases. The gas has three conditions of explosion or combustion, namely the concentration of the gas reaches 5 to 16 percent; second, the ambient temperature; thirdly, the oxygen environment is sufficient, and explosion and combustion can occur when the oxygen concentration is more than 12 percent. And when the concentration of the gas in the air is less than 5%, the gas cannot be combusted, and when the concentration of the gas in the air is more than 16%, the gas cannot be exploded or combusted.
The low gas work area and the high gas work area can be judged according to the absolute gas emission quantity. When the gas emission quantity of the whole work area is less than 0.5m 3 At/min, the low gas work area is obtained; greater than or equal to 0.5m 3 At min, it is a high gas work area. In the prior art, in order to avoid the gas explosion accident, a plurality of gas comprehensive management construction methods related to a high gas work area are disclosed, but a gas comprehensive management construction method related to a low gas section of a work area at the exit of a tunnel is not disclosed, so that the gas explosion accident at the low gas section is reduced.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a comprehensive management construction method for low-gas section gas in a tunnel exit work area.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the method for comprehensively managing and constructing the low-gas section gas at the work area of the tunnel exit comprises the following steps:
s1, advanced geological prediction:
according to the geological conditions of the tunnel, the influence factors of the poor geologic body on the construction and the risk level of the poor geologic body, adopting different advanced geological prediction method combination modes to obtain the basic conditions of the low gas section of the work area at the exit of the tunnel;
s2, construction ventilation:
natural ventilation is adopted within 150m of tunnel excavation, and single-head press-in ventilation of a soft air pipe is adopted more than 150 m; when the working face is tunneled in one direction for a long time, the fans are connected in series according to the effective ventilation distance of the fans, relay ventilation is carried out, the distance between a hole fan and a hole is not less than 30m, and the distance between a wind pipe opening and a tunnel face is less than 15m;
s3, gas monitoring:
adopting a mode of combining manual detection and automatic monitoring, alarming when the gas concentration reaches 0.3%, stopping working when the gas concentration reaches 0.5%, withdrawing personnel, cutting off a power supply in a tunnel, and electrifying when the gas concentration is lower than 0.4%;
s4, gas drainage:
drainage path of groundwater: annular blind pipe → longitudinal blind pipe → water-gas separation chamber → water chamber/side ditch communicating pipe → tunnel inner ditch;
emission route of harmful gas: annular blind pipe → longitudinal blind pipe → water-gas separation chamber → gas drainage pipe at the bottom of side wall → discharge hole;
s5, gas drilling and blasting:
the drilling operation of the gas work area needs to adopt wet drilling, and the drilling operation needs to be carried out after boiling water and then blowing and then sending power; after drilling, firstly closing air and water, and then cutting off power; when the gas concentration in the wind flow within 20m of the vicinity of the operation site reaches 1%, the drilling operation must be stopped.
Further, in the step S1, the advanced geological prediction method includes a geological survey method, a geophysical prospecting method and an advanced drilling method; the geophysical prospecting method comprises a seismic wave reflection method and a geological radar method, and the advanced drilling method comprises advanced geological drilling and shot hole deepening.
Further, in step S3, the manual detection method includes the following steps:
(1) Detecting each measuring point in the tunnel by using an optical interference methane detector by adopting a five-point method, namely detecting the positions of the top, two sides of the waist and two sides of the bottom of the tunnel, which are 200mm away from the periphery of the tunnel, and taking the maximum concentration in the five points as the gas concentration at the position;
(2) Detecting the hidden material storage chamber manual gas at the innermost part of the chamber, detecting the lining section change part at the highest section change part, and detecting by adopting a five-point method;
(3) Detecting a tunnel face in a section 0.5-1 m in front of the tunnel face, detecting return air in a section 15m away from a return air inlet to the tunnel face, detecting inlet air at an inlet of a press-in fan, detecting a high-emission area by adopting a five-point method, and detecting total return air in a straight tunnel in front of the inlet of a draw-out fan;
(4) Detecting the cavern, the total return air, the high emission area, the inlet air, the return air and the tunnel face once every two hours; detecting once per hour during electric welding; the detection is carried out once per hour when the palm surface is subjected to slag tapping, and the detection is carried out according to a five-point method.
Further, in step S5, the gas drilling and blasting includes the following steps:
(1) The gas concentration in the air flow must be less than 1% within 20m of the blasting site;
(2) Within 20m of the blasting place, the blocking excavation section of mine cars, broken stones, coal slag and other objects is not more than 1/3;
(3) The ventilation air quantity is sufficient and the wind direction is stable;
(4) Cleaning coal and rock powder in the blasting holes;
(5) The blast hole has insufficient sealing mud or is not tight and can not be blasted.
The invention has the beneficial effects that:
the invention provides a comprehensive management and construction method for low-gas section gas in a work area at a tunnel exit, provides a scientific solution for the occurrence of gas explosion accidents of the low-gas section, and ensures the construction safety of the low-gas tunnel.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic view of ventilation in tunnel construction of a small new street according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a gas discharge path of a tunnel main tunnel in a new street according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Examples
Referring to fig. 1, a comprehensive management construction method for low-gas section gas in a work area at a tunnel exit is provided, and the method comprises the following steps:
s1, advanced geological prediction:
and acquiring the basic conditions of the low gas section of the work area at the exit of the tunnel by adopting different advanced geological forecast method combination modes according to the geological conditions of the tunnel, the influence factors of the unfavorable geologic body on the construction and the risk level of the unfavorable geologic body. The advanced geological forecast method comprises a geological survey method, a geophysical prospecting method and an advanced drilling method; the geophysical prospecting method comprises a seismic wave reflection method and a geological radar method, and the advanced drilling method comprises advanced geological drilling and shot hole deepening. In the embodiment, a low-gas section of a work area at the exit of a tunnel of a small new street is selected as a construction object, and the specific implementation method of the advanced geological forecast is shown in tables 1-3.
TABLE 1 Small New street tunnel exit advanced geological forecast implementation method
TABLE 2 geophysical Classification and methods
TABLE 3 advanced geological borehole classification
S2, construction ventilation:
referring to fig. 2, when the front tunnel is constructed at the inlet and outlet of the small new street tunnel, the ventilation adopts press-in ventilation, the axial flow fan is arranged at the tunnel opening, and the local fan is arranged at the excavation section of the tunnel body. Natural ventilation is adopted within 150m of tunneling, and single-head press-in ventilation of a soft air pipe is adopted more than 150m of tunneling. When the working face is tunneled in one direction for a long time, the fans can be connected in series according to the effective ventilation distance of the fans, relay ventilation is achieved, and the air pipes are all large-caliber soft air pipes so as to reduce air leakage of joints. The distance between the fan at the hole opening and the hole opening is not less than 30m, and the distance between the fan opening and the tunnel face is less than 15m.
S3, gas monitoring:
in construction, the gas (the main component is CH) has the greatest influence on the safe production 4 ) Carbon dioxide (CO) 2 ) The concentration of (c). Therefore, in the tunnel construction, CH is mainly used 4 、CO 2 And monitoring the concentration of harmful gas in the tunnel for monitoring the object. This tunnel gas monitoring adopts artifical and automatic monitoring mode that combines together, and the numerical value of both monitoring is verified, avoids the wrong report phenomenon. In combination with the actual situation of the tunnel, the KJ350X gas monitoring system is selected for automatic monitoring of the exit of the tunnel in the small new street of the embodiment.
The manual detection requirement is as follows:
(1) when people at each measuring point in the tunnel use the optical interference methane measuring device for detection, a five-point method is adopted for detection, namely, the positions of the top, two sides of the waist and two sides of the bottom of the tunnel, which are 200mm away from the periphery of the tunnel, are detected, and the maximum concentration in the five points is taken as the concentration of gas (containing carbon dioxide) at the position for daily management;
(2) manual gas detection of the sheltering type material storage chamber is carried out at the innermost position of the chamber, and the change position of the lining section is detected at the highest position of the section change, and the five-point method is still adopted for detection;
(3) the tunnel face detection is to be detected in a cross section 0.5-1 m in front of the tunnel face, the return air detection is to be detected in a cross section 15m away from a return air inlet to the tunnel face, the inlet air detection is to be detected at an inlet of a press-in type fan, the high-emission area detection is to be detected in a high-emission area by adopting a five-point method, and the total return air is to be detected in a straight roadway in front of an inlet of a draw-out type main fan;
(4) the regulation of detection frequency (times) is that the cavern, the total return air, the high emission area, the air inlet, the return air and the tunnel face are detected once every two hours in principle; detecting once per hour during electric welding; the detection is carried out once per hour when the slag is discharged from the tunnel face, the detection is carried out according to a five-point method, and the detection is carried out according to the requirement of 'one-gun three-detection' system when a gun is placed at a blasting place once (the gas concentration in the blast current of the blasting place and the blasting place is checked, CH) 4 Blasting if the concentration is lower than 0.5%).
(5) Concentration control and measures:
the application gas detection concentration control standard is as follows: when the gas concentration reaches 0.3%, alarming (the tile detector gives an alarm to the field leader, the field leader reports to all levels and immediately organizes the relevant personnel to find out the reason for treatment), when the gas concentration reaches 0.5%, the tile detector immediately reports to the field construction leader, the field construction leader immediately organizes and stops working, withdraws the personnel, cuts off the power supply in the tunnel, reports to the project manager, reports to all levels, and the relevant personnel make measures for treatment. If the gas concentration is lower than 0.4%, the power can be recovered.
An artificial gas detection site:
(1) digging the working face and other working places in the wind flow.
(2) In the wind flow within 20m of the vicinity of the blast site.
(3) In the wind flow within 20m in the vicinity of the work vehicle and the work machine.
(4) The local fan and the electric switch 20 m.
(5) In the wind flow within 20m near the motor and the switch.
(6) The gas accumulation parts such as section change, local collapse, cavern, advanced drilling, deepened blast hole and the like are easy to generate.
(7) Coal seam passing, fault fracture zone, fissure zone and abnormal gas gushing point.
(8) A site within the tunnel where a fire source may be created.
(9) And the air return flow of tunnel type ventilation is adopted.
Other ventilation blind areas and ventilation weak areas.
When the gas concentration is 0.5-0.75%, organizing and treating by a construction unit; when the gas concentration is 0.75-1%, the supervision unit and the construction unit jointly research and process and report to the construction unit; when the gas concentration exceeds 1%, the construction unit organizes construction and supervision units to jointly study and process. When the gas automatic monitoring system fails, the gas automatic monitoring system needs to process timely, and safety measures such as human-type detection and the like need to be adopted during the failure, and a failure record is filled in.
S4, gas drainage:
(1) The small new street tunnel DK665+ 650-DK 665+755 section is a Longtan group (P2 l) stratum, a low gas section, the gas content per ton coal is 3.59m3/t, the gas pressure is 0.15-0.74 Mpa, and the small new street tunnel DK is a gas secondary defense section.
(2) The gas fortification sections extend 50m respectively, and the tunnel DK665+ 600-DK 665+805 sections are gas secondary fortification sections and are fully-closed lined. An EVA waterproof plate and a geotextile cushion layer are laid on the primary support and the secondary lining of the full-sealed section in a full-ring mode, a ring-shaped blind pipe and a longitudinal blind pipe are arranged behind the lining, and in order to prevent underground water from bringing gas into a tunnel, the longitudinal blind pipe and the ring-shaped blind pipe cannot be connected into a side ditch. The annular blind pipe is connected with the longitudinal blind pipe through a tee joint, the longitudinal blind pipe is connected with a water-gas separation type, underground water can be discharged into a side ditch after water-gas separation is carried out, and separated gas is led out from a front hole opening through a phi 100 gas drainage pipe and is discharged at a high position, as shown in figure 3.
Drainage path of groundwater: annular blind pipe → longitudinal blind pipe → water-gas separation chamber → water chamber/side ditch communicating pipe → tunnel inner ditch.
Discharge route of harmful gas such as gas: annular blind pipe → longitudinal blind pipe → water-gas separation chamber → gas drainage pipe at the bottom of side wall → discharge hole.
(3) The tunnel is provided with 1 group of 2 water-gas separation chambers, and the DK665+805 part is provided with 1 group of water-gas separation chambers.
(4) The gas separated from the water-gas separation chambers at the two sides of the gas defense section is guided and discharged to one side of the circuit and is guided and discharged through the gas guide and discharge pipe at the bottom of the side wall. Gas separated from the DK665+ 650-DK 665+850 sections is discharged from the water-gas separation chamber at the DK665+805 part to the outside of the tunnel from the tunnel outlet through a gas drainage pipe, and the longitudinal gas drainage pipe is arranged between the primary support at the left side of the line and the secondary lining.
(5) The special pipeline for the gas drainage adopts a steel skeleton Polyethylene (PE) plastic composite pipe for ID100 gas, and when the special pipeline for the gas drainage is arranged in a clearance of a tunnel hole, attention needs to be paid to protection during construction, collision between vehicles, construction machinery and the like and the gas drainage pipe is avoided, and a specially-assigned person is arranged to regularly carry out inspection and maintenance.
(6) The distance between the upper part of the outlet of the gas drainage pipeline outside the outlet hole and the top of the vault is not less than 3m, a rain shielding pipe cap is arranged at the upper end of the gas drainage pipeline, and open fire sources and flammable and explosive materials are forbidden in the surrounding 20 m.
(7) During construction, the gas drainage pipeline is ensured to be connected perfectly. The air permeability of the guide and exhaust pipeline and the water-gas chamber is not more than 1 multiplied by 10 < -14 > cm/s, and the exhaust is smooth.
S4, gas drilling and blasting:
(1) The drilling operation of the gas work area needs to adopt wet drilling, and the drilling operation needs to be carried out after boiling water and then blowing and then sending power; after drilling, closing air and water, and then cutting off power; when the gas concentration in the wind flow within 20m of the vicinity of the operation site reaches 1%, the drilling operation must be stopped.
(2) The charging and blasting operation of the gas work area meet the following regulations:
(1) the gas concentration in the air flow must be less than 1% within 20m of the blasting site;
(2) within 20m of the blasting place, the blocking excavation section of mine cars, broken stones, coal slag and other objects is not more than 1/3;
(3) the ventilation air quantity is sufficient and the wind direction is stable;
(4) cleaning coal and rock powder in the blasting holes;
(5) the blast hole has insufficient sealing mud or is not tight and can not be blasted.
(3) The blasting operation of the gas work area must adopt coal mine permitted explosives, and the following regulations are met:
(1) tunneling a rock stratum of the low-gas work area, and using the coal mine allowable explosive with the safety grade not lower than the first grade;
(2) the coal uncovering and coal seam and half coal seam tunneling in the low gas work area use the coal mine permitted explosive with the safety grade not lower than the second grade.
(4) The blasting in the gas work area uses an instant electric detonator allowed for coal mines or a millisecond delay electric detonator allowed for coal mines, and uses an explosion-proof type blasting machine for blasting. No detonating tube or common detonating cord should be used, and fire detonator is strictly forbidden. When the millisecond delay electric detonator allowed in the coal mine is used, the delay time from the initiation to the last section should not exceed 130ms, and the electric detonator cannot be used in a jump section.
(5) The blast hole in the gas work area is necessarily filled with clay or clay-sand mixture and other non-combustible materials, and the filling and clay-sealing materials do not contain coal powder, block materials or other combustible materials. The filling length of the blast hole meets the following requirements:
(1) the depth of the blast hole is not less than 0.6m; under special conditions, when the depth of the blast hole is less than 0.6m, special safety measures must be adopted, and the stemming is sealed;
(2) when the depth of the blast hole is 0.6-1 m, the length of the sealing mud is not less than 1/2 of the length of the blast hole;
(3) when the depth of the blast hole exceeds 1m, the sealing mud length is not less than 0.5m;
(4) when the depth of the blast hole exceeds 2.5m, the mud sealing length is not less than 1m;
(5) during smooth blasting, the peripheral smooth blasting holes are sealed by using stemming, and the sealing length is not less than 0.5m;
(6) when the working face has two or more free faces, the minimum resistance line in the coal seam should not be less than 0.5m, and the minimum resistance line in the rock should not be less than 0.3m. When the large rock is blasted by shallow hole charging, the minimum resisting line and the sealing mud length are not less than 0.3m;
(7) when the blast hole is plugged by water stemming, sealing the rest of the blast hole outside the water stemming by using clay stemming, wherein the length of the blast hole is not less than 0.3m;
(8) blast holes without sealing mud, insufficient sealing mud or unrealistic sealing mud are strictly forbidden to blast;
(9) the reverse charging is strictly forbidden.
(6) Blasting networks and connections must meet the following requirements:
(1) a series connection must be used. All the connecting joints of the circuit are tightly twisted, and the open wire part is wrapped by the insulating layer and suspended;
(2) the bus, the cable, the electric wire and the signal wire are hung on two sides of the roadway respectively. If the bus bars are required to be arranged on the same side, the bus bars are required to be hung below the cables and the distance between the bus bars and the cables is required to be kept more than 0.3m;
(3) the bus should adopt the copper core cable that has good insulating nature and compliance, hangs along with using, forbids to fix it strictly. The length of the bus must be greater than the specified blasting safety distance;
(4) insulated bus single loop blasting must be employed.
(5) The instantaneous electric detonator and the millisecond electric detonator are strictly forbidden to be used in the same series network.
(7) The electric initiation must use explosion-proof type exploder operation initiation power, and one excavation working face must not use two or more exploders to initiate simultaneously.
(8) When blasting operation is carried out in a low-gas work area, a safener and a gas checker jointly tour the blasting site after blasting for 30min, and check the conditions of ventilation, gas, coal dust, misfire, running and the like, and the blasting must be immediately processed when danger exists. The blind and incomplete run processing is carried out according to the relevant regulations of coal mine safety regulations. When the gas concentration is less than 0.5 percent and the carbon dioxide concentration is less than 1.5 percent, the worker can enter the excavation working face to work after the warning is removed.
(9) The operations of purchasing, transporting, warehousing, issuing, returning, destroying, storing and the like of the blasting equipment are executed according to relevant regulations of the state and the Ministry of railways; the blasting materials are uniformly managed and distributed, and the blasting materials are not uniformly used without meeting the requirements. The initiating explosive device entering the hole must be managed by a special person to determine the quantity of the blasting equipment,
and keeping away from a dangerous source, strictly prohibiting non-blasting personnel from blasting construction, monitoring the blasting on site, constructing strictly according to a blasting design, and making a blasting monitoring record.
The invention provides a comprehensive management and construction method for low-gas section gas in a work area at a tunnel exit, provides a scientific solution for the occurrence of gas explosion accidents of the low-gas section, and ensures the construction safety of the low-gas tunnel.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. A tunnel exit work area low-gas section gas comprehensive management construction method is characterized by comprising the following steps:
s1, advanced geological prediction:
according to the geological conditions of the tunnel, the influence factors of the bad geological body on the construction and the risk level of the bad geological body, adopting different advanced geological forecast method combination modes to obtain the basic condition of the low gas section of the work area at the exit of the tunnel;
s2, construction ventilation:
natural ventilation is adopted within 150m of tunnel excavation, and single-head press-in ventilation of a soft air pipe is adopted more than 150 m; when the working face is tunneled in one direction for a long time, the fans are connected in series according to the effective ventilation distance of the fans, relay ventilation is carried out, the distance between a hole fan and a hole is not less than 30m, and the distance between a wind pipe opening and a tunnel face is less than 15m;
s3, monitoring gas:
adopting a mode of combining manual detection and automatic monitoring, alarming when the gas concentration reaches 0.3%, stopping working when the gas concentration reaches 0.5%, withdrawing personnel, cutting off a power supply in a tunnel, and electrifying when the gas concentration is lower than 0.4%;
s4, gas drainage:
drainage path of groundwater: circular blind pipe → longitudinal blind pipe → water-gas separation chamber → water chamber/side ditch communicating pipe → tunnel inner side ditch;
discharge path of harmful gas: annular blind pipe → longitudinal blind pipe → water-gas separation chamber → gas drainage pipe at the bottom of side wall → discharge hole;
s5, gas drilling and blasting:
the drilling operation of the gas work area needs to adopt wet drilling, and the drilling operation needs to be carried out after boiling water and then blowing and then sending power; after drilling, shutting off the wind and water, and then cutting off the power; when the gas concentration in the wind flow within 20m near the operation site reaches 1%, the drilling operation must be stopped.
2. The construction method of the low gas section of the tunnel exit workplace according to claim 1, wherein in the step S1, the advanced geological prediction method comprises a geological survey method, a geophysical prospecting method and an advanced drilling method; the geophysical prospecting method comprises a seismic wave reflection method and a geological radar method, and the advanced drilling method comprises advanced geological drilling and shot hole deepening.
3. The construction method of the tunnel exit work area low gas section according to claim 1, wherein in step S3, the manual detection method comprises the following steps:
(1) Detecting each measuring point in the tunnel by using an optical interference methane detector by adopting a five-point method, namely detecting the positions of the top, two sides of the waist and two sides of the bottom of the tunnel, which are 200mm away from the periphery of the tunnel, and taking the maximum concentration in the five points as the gas concentration at the position;
(2) Detecting the hidden material storage chamber manual gas at the innermost part of the chamber, detecting the lining section change part at the highest section change part, and detecting by adopting a five-point method;
(3) Detecting a tunnel face in a section 0.5-1 m in front of the tunnel face, detecting return air in a section 15m away from a return air inlet to the tunnel face, detecting inlet air at an inlet of a press-in fan, detecting a high-emission area by adopting a five-point method, and detecting total return air in a straight tunnel in front of the inlet of a draw-out fan;
(4) Detecting the cavern, the total return air, the high-emission area, the inlet air, the return air and the tunnel face every two hours; detecting once per hour during electric welding; the detection is carried out once per hour when the palm surface is subjected to slag tapping, and the detection is carried out according to a five-point method.
4. The construction method of the low gas section of the tunnel exit working area according to claim 1, wherein in the step S5, the gas drilling and blasting comprises the following steps:
(1) The gas concentration in the air flow must be less than 1% within 20m of the blasting site;
(2) Within 20m of the blasting place, the blocking excavation section of mine cars, broken stones, coal slag and other objects is not more than 1/3;
(3) The ventilation response air quantity is sufficient, and the air direction is stable;
(4) Cleaning coal and rock powder in the blast hole;
(5) The blast hole has insufficient sealing mud or is not tight and can not be blasted.
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| CN117662227A (en) * | 2023-10-23 | 2024-03-08 | 中铁七局集团第四工程有限公司 | Construction method applied to gas tunnel |
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| CN117662227A (en) * | 2023-10-23 | 2024-03-08 | 中铁七局集团第四工程有限公司 | Construction method applied to gas tunnel |
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