CN113958333B - Underground harmful gas prevention and control method for subway tunnel construction for preventing road settlement - Google Patents
Underground harmful gas prevention and control method for subway tunnel construction for preventing road settlement Download PDFInfo
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- CN113958333B CN113958333B CN202111439092.XA CN202111439092A CN113958333B CN 113958333 B CN113958333 B CN 113958333B CN 202111439092 A CN202111439092 A CN 202111439092A CN 113958333 B CN113958333 B CN 113958333B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
- B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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- Agronomy & Crop Science (AREA)
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Abstract
The invention discloses a method for preventing and controlling underground harmful gas in subway tunnel construction, which comprises the following steps: 1. digging the ground; 2. drilling a first borehole and a second borehole; 3. reinforcing the hole wall; 4. drilling a third borehole; 5. exhausting and filling the air bag; 6. lifting the drill and backfilling the drill hole. According to the invention, a drill stem is used for driving a drill stem drill bit, harmful gas is collected through a gas collecting bag, concrete is stored in a concrete storage tank, cleaning water is stored in a water storage tank, a protective barrel is sleeved outside the drill stem, a partition plate is arranged in the protective barrel, the drill bit and the partition plate are matched to form a containing cavity for guiding the harmful gas to be discharged, the harmful gas enters the containing cavity through an air guide hole and is discharged through an air guide pipe, meanwhile, concrete is conveyed to a harmful gas accumulation position through a grouting pipe, a gap is filled, the potential safety hazard caused by the harmful gas in the tunnel shield construction of subway engineering is reduced to the maximum extent, ground subsidence is avoided, and subway construction and operation safety are ensured.
Description
Technical Field
The invention belongs to the technical field of underground harmful gas prevention and control in subway tunnel construction, and particularly relates to a method for preventing road settlement in underground harmful gas prevention and control in subway tunnel construction.
Background
In the prior urban subway tunnel construction, aiming at the stratum containing silty clay, peat soil, silty soil and silty soil, various harmful gases often exist, the harmful gases mainly comprise methane, the peat soil is mainly used as a source of gas generation, the gases are mainly stored in the silty soil, silty sand and silty clay layers, the methane mainly exists between the sandy soil above a gas generation layer and clay with poor air permeability, most of free methane is compressed in the concave part of the clay layers to form an air bag, wherein the release and aggregation of the gas in the tunnel directly threatens the safety of shield construction and operation, and aiming at the stratum containing multiple layers of peat soil, the gas eruption and combustion phenomena occur for many times in the past in the exploration holes, so that the subway construction and the safety of surrounding buildings are seriously influenced. And moreover, road settlement on the ground can be caused by using drilling exhaust, and the burden of ground traffic jam or no pass is increased, so that a subway tunnel construction underground harmful gas prevention and control method for preventing the road settlement is not convenient and rapid to implement at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for preventing underground harmful gas in subway tunnel construction, which comprises the steps of driving a drill rod drill bit by a drilling machine, collecting harmful gas by a gas collecting bag, storing concrete by a concrete storage tank, storing cleaning water by a water storage tank, sleeving a protective cylinder outside the drill rod, arranging a baffle plate in the protective cylinder, matching the protective cylinder, the drill bit and the baffle plate to form a containing cavity for guiding the harmful gas to be discharged, leading the harmful gas to enter the containing cavity through an air guide hole, discharging the harmful gas through an air guide pipe, conveying the concrete to a harmful gas accumulation position by a grouting pipe, filling a gap, furthest relieving potential safety hazard caused by the harmful gas in subway engineering tunnel shield construction, avoiding ground subsidence, ensuring subway construction and operation safety, and being convenient to popularize and use.
In order to solve the technical problems, the invention adopts the following technical scheme: the underground harmful gas prevention method for preventing road settlement in subway tunnel construction is characterized by comprising the following steps of:
step one, ground excavation: excavating an excavation layer with the depth of 2m to 4m on the ground right above the air bag;
step two, drilling a first drilling hole and a second drilling hole: drilling a first drilling hole with the depth of 3m to 5m at the bottom center position of the excavation layer by using a first drilling rod, and drilling a second drilling hole with the depth of 4m to 8m at the bottom center position of the first drilling hole by using a second drilling rod;
the aperture of the second drilling hole is smaller than that of the first drilling hole;
step three, reinforcing the hole wall, namely extending a drilling tool into the center position of the bottom of the second drilling hole, and filling a supporting filling body between the drilling tool and the first drilling hole and between the drilling tool and the second drilling hole, wherein the top of the supporting filling body is higher than Kong Dinggao degrees of the first drilling hole;
the drilling tool comprises a casing and a drill bit arranged at the bottom of the casing, a partition plate is horizontally arranged at the lower side in the casing, a central hole, a first side hole, a second side hole and a third side hole are formed in the partition plate, the first side hole, the second side hole and the third side hole are all positioned at the outer side of the central hole, a drill rod penetrates through the central hole to be connected with the drill bit, one end of the drill rod, which is far away from the drill bit, is connected with the drill machine, an air duct is communicated with the first side hole, a vertical through hole for installing a one-way valve is formed in the drill bit, a grouting pipe penetrates through the second side hole to be communicated with the one-way valve, the water injection pipe is communicated with the third side hole, the casing, the drill bit and the partition plate are matched to form a containing cavity for guiding harmful gas to be exhausted, and a plurality of air ducts are formed in the bottom of the casing, and the containing cavity is communicated with the air duct through the first side hole;
one end of the air duct, which extends out of the pile casing, is connected with an air collecting bag, one end of the grouting pipe, which extends out of the pile casing, is connected with a concrete storage tank for storing concrete, and one end of the water injection pipe, which extends out of the pile casing, is connected with a water storage tank;
the position of the air duct, which extends out of the pile casing, is provided with an exhaust valve and a pressure gauge, the position of the grouting pipe, which extends out of the pile casing, is provided with a grouting valve, and the position of the grouting pipe, which extends out of the pile casing, is provided with a water injection valve;
step four, drilling a third drilling hole: closing the exhaust valve, the grouting valve and the water injection valve, and driving a drill rod by the drilling machine, and driving the drill bit to drill a third drilling hole by the drill rod until the drill bit stretches into the air sac;
the aperture of the third drilling hole is smaller than that of the second drilling hole;
fifth, the air bag is exhausted and filled: the method comprises the steps that harmful gas in an air bag enters a containing cavity through an air guide hole and then enters the air guide pipe, the pressure in the air guide pipe is increased, a pressure gauge displays a pressure value, an exhaust valve and a grouting valve are simultaneously opened, a gas collecting bag collects the harmful gas output by the air guide pipe, a grouting pump in a concrete storage tank pumps concrete to the grouting pipe, wherein the grouting pressure is larger than pressure data displayed by the pressure gauge, the position of the concrete entering the air bag is guaranteed, when the pressure gauge data is reduced or lowered, the water injection valve is opened, the air guide hole is cleaned by the water injection pipe, the blocking of the air guide hole is avoided until the harmful gas in the air bag is completely discharged, and the air bag is filled;
step six, lifting a drill and backfilling the drill hole: and (3) lifting the drilling tool, continuously pumping concrete to the grouting pipe by using a grouting pump in the concrete storage tank, backfilling the drilled holes, forming concrete reinforcing bodies by using the concrete in the air bag, the concrete in the third drilled hole, the concrete in the second drilled hole, the concrete in the first drilled hole and the support filling body, and realizing harmful gas prevention and treatment, namely stratum reinforcement and preventing road settlement.
The underground harmful gas prevention method for preventing road settlement in subway tunnel construction is characterized by comprising the following steps of: the position of the air guide hole in the protective barrel is provided with a first filter screen.
The underground harmful gas prevention method for preventing road settlement in subway tunnel construction is characterized by comprising the following steps of: a second filter screen is arranged in the first side hole.
The underground harmful gas prevention method for preventing road settlement in subway tunnel construction is characterized by comprising the following steps of: the gas collection bag is an FEP Teflon gas sampling bag.
The underground harmful gas prevention method for preventing road settlement in subway tunnel construction is characterized by comprising the following steps of: the supporting filling body is a broken stone supporting filling body.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the drill rod drill bit is driven by the drilling machine, harmful gas is collected through the gas collecting bag, the concrete storage tank stores concrete, and the water storage tank stores cleaning water so as to clean the air guide hole, so that the device is convenient to popularize and use.
2. The vertical through hole for installing the one-way valve is formed in the drill bit, the grouting pipe penetrates through the second side hole and is communicated with the one-way valve, concrete backflow is avoided, the purpose of releasing harmful gas in a shield zone in advance is achieved, the safety risk of underground shield construction of a subway is reduced, the contradiction between construction and ground traffic untwining is relieved to the greatest extent, the ground subsidence problem is eliminated, and the potential safety hazard caused by the harmful gas in the shield construction of a tunnel of the subway engineering is relieved to the greatest extent.
3. According to the invention, the protective cylinder is arranged on the protective cylinder, the drill bit is arranged at the bottom of the protective cylinder, the drill rod is positioned in the protective cylinder, the partition plate is arranged in the protective cylinder, the drill bit and the partition plate are matched to form the containing cavity for guiding the harmful gas to be discharged, the harmful gas enters the containing cavity through the gas guide hole and is discharged through the gas guide pipe, meanwhile, the grouting pipe is used for conveying concrete to the harmful gas accumulation position, the gap is filled, the potential safety hazard caused by the harmful gas in the tunnel shield construction of the subway engineering is reduced to the maximum extent, the ground subsidence is avoided, and the gas guide hole is cleaned and blocked by the water injection pipe.
4. The method has simple steps, and the concrete in the air bag, the concrete in the third drilling hole, the concrete in the second drilling hole, the concrete in the first drilling hole and the supporting filling body form a concrete reinforcement body to form an I-shaped anchor body, so that the stratum is effectively reinforced, and the popularization and the use are convenient.
In summary, the drilling machine is used for driving the drill stem and the drill bit, harmful gas is collected through the gas collecting bag, the concrete is stored in the concrete storage tank, the cleaning water is stored in the water storage tank, the protective barrel is sleeved outside the drill stem, the partition plate is arranged in the protective barrel, the drill bit and the partition plate are matched to form the containing cavity for guiding the harmful gas to be discharged, the harmful gas enters the containing cavity through the gas guide hole and is discharged through the gas guide pipe, and meanwhile, the grouting pipe is used for conveying the concrete to the harmful gas accumulation position, so that gaps are filled, potential safety hazards caused by the harmful gas in the tunnel shield construction of subway engineering are reduced to the maximum extent, ground subsidence is avoided, subway construction and operation safety are ensured, and popularization and use are facilitated.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic view showing the implementation effect of the drilling tool extending into the air bag.
Fig. 2 is an enlarged view at a of fig. 1.
Fig. 3 is a schematic structural view of the drilling tool of the present invention.
Fig. 4 is a B-B cross-sectional view of fig. 3.
FIG. 5 is a diagram showing the effect of the concrete backfill according to the present invention.
Fig. 6 is a flow chart of the method of the present invention.
Reference numerals illustrate:
1-protecting a cylinder; 2-a drill bit; 3-a separator;
4, a drill rod; 5-an air duct; 6, grouting pipe;
7-a water injection pipe; 8-a first filter screen; 9-a second filter screen;
10-a one-way valve; 11-an exhaust valve; 12-a pressure gauge;
13-grouting valve; 14-a water filling valve; 15-a first bypass hole;
16-a second side hole; 17-a third side hole; 18-a central hole;
19-peat soil layer; 20-sandy silty soil layer; 21-a clay layer;
22-an air bag; 23-concrete; 24-excavating a layer;
25-first drilling; 26-second drilling; 27-supporting the filling body;
28-a gas collection bag; 29-a concrete storage tank; 30-a drilling machine;
31-a water storage tank; 32-concrete reinforcement.
Detailed Description
As shown in fig. 1 to 6, the underground harmful gas prevention method for subway tunnel construction, which prevents road settlement, of the present invention comprises the steps of:
step one, ground excavation: an excavation layer 24 having a depth of 2m to 4m is excavated on the ground just above the air bag 22;
step two, drilling a first drilling hole and a second drilling hole: drilling a first drilling hole 25 with the depth of 3m to 5m at the center position of the bottom of the excavation layer 24 by using a first drilling rod, and drilling a second drilling hole 26 with the depth of 4m to 8m at the center position of the bottom of the first drilling hole 25 by using a second drilling rod;
the aperture of the second bore 26 is smaller than the aperture of the first bore 25;
step three, reinforcing the hole wall, namely extending a drilling tool into the center position of the bottom of the second drilling hole 26, and filling a supporting filling body 27 between the drilling tool and the first drilling hole 25 and between the drilling tool and the second drilling hole 26, wherein the top of the supporting filling body 27 is higher than Kong Dinggao degrees of the first drilling hole 25;
the drilling tool comprises a casing 1 and a drill bit 2 arranged at the bottom of the casing 1, a partition plate 3 is horizontally arranged at the lower side in the casing 1, a central hole 18, a first side hole 15, a second side hole 16 and a third side hole 17 which are all positioned at the outer side of the central hole 18 are formed in the partition plate 3, a drill rod 4 passes through the central hole 18 to be connected with the drill bit 2, one end, far away from the drill bit 2, of the drill rod 4 is connected with a drilling machine 30, an air duct 5 is communicated with the first side hole 15, a vertical through hole for installing a one-way valve 10 is formed in the drill bit 2, a grouting pipe 6 passes through the second side hole 16 to be communicated with the one-way valve 10, a water injection pipe 7 is communicated with the third side hole 17, a holding cavity for guiding harmful gas to be discharged is formed by cooperation of the casing 1, the drill bit 2 and the partition plate 3, and a plurality of air guide holes are formed in the bottom of the casing 1, and the holding cavity is communicated with the air duct 5 through the first side hole 15;
one end of the air duct 5 extending out of the pile casing 1 is connected with an air collecting bag 28, one end of the grouting pipe 6 extending out of the pile casing 1 is connected with a concrete storage tank 29 for storing concrete 23, and one end of the water injection pipe 7 extending out of the pile casing 1 is connected with a water storage tank 31;
an exhaust valve 11 and a pressure gauge 12 are arranged at the position of the air duct 5 extending out of the pile casing 1, a grouting valve 13 is arranged at the position of the grouting pipe 6 extending out of the pile casing 1, and a water injection valve 14 is arranged at the position of the water injection pipe 7 extending out of the pile casing 1;
step four, drilling a third drilling hole: closing the exhaust valve 11, the grouting valve 13 and the water injection valve 14, driving the drill rod 4 by the drilling machine 30, and driving the drill bit 2 to drill a third drilling hole by the drill rod 4 until the drill bit 2 stretches into the air bag 20;
the aperture of the third bore is smaller than the aperture of the second bore 26;
fifth, the air bag is exhausted and filled: harmful gas in the air bag 20 enters the accommodating cavity through the gas guide hole and then enters the gas guide pipe 5, the pressure in the gas guide pipe 5 is increased, the pressure gauge 12 displays a pressure value, the exhaust valve 11 and the grouting valve 13 are simultaneously opened, the harmful gas output by the gas guide pipe 5 is collected by the gas collection bag 28, concrete is pumped to the grouting pipe 6 by the grouting pump in the concrete storage tank 29, wherein the grouting pressure is larger than the pressure data displayed by the pressure gauge 12, the concrete is ensured to enter the position of the air bag 20, when the data of the pressure gauge 12 is reduced or lowered, the water injection valve 14 is opened, the gas guide hole is cleaned by the water injection pipe 7, the blockage of the gas guide hole is avoided until the discharge of the harmful gas in the air bag is completed, and the filling of the air bag 20 is realized;
step six, lifting a drill and backfilling the drill hole: the lifting drilling tool, the grouting pump in the concrete storage tank 29 continues to pump concrete to the grouting pipe 6, the drill holes are backfilled, the concrete in the air bag, the concrete in the third drill hole, the concrete in the second drill hole, the concrete in the first drill hole and the supporting filling body 27 form a concrete reinforcing body 32, and the prevention and treatment of harmful gas, namely the formation reinforcement, are realized, and the road settlement is prevented.
In this embodiment, the drill bit 2 extends into the air pocket 22, and the air pocket 22 is located between the sandy clay layer 20 and the clay layer 21 in the formation.
The peat soil layer 19 is a main source of gas, and is prone to generate harmful gas, the harmful gas is mainly methane, and the harmful gas permeates through pores in the sandy clay soil layer 20 and gathers at the bottom of the clay soil layer 21 to form an air bag.
In this embodiment, a first filter screen 8 is disposed in the casing 1 at a position located at the air vent.
In this embodiment, the second filter screen 9 is disposed in the first side hole 15.
In this embodiment, the gas collection bag 28 is an FEP Teflon gas sampling bag.
In this embodiment, the supporting filler 27 is a crushed stone supporting filler.
When the method is used, the steps of the method are simple, concrete in the air bag, concrete in the third drilling hole, concrete in the second drilling hole, concrete in the first drilling hole and the supporting filling body form a concrete reinforcement body to form an I-shaped anchor body, so that a stratum is effectively reinforced, a drill rod drill bit is driven by a drilling machine, harmful gas is collected by a gas collecting bag, concrete is stored in a concrete storage tank, and cleaning water is stored in a water storage tank so as to clean an air guide hole; the vertical through hole for installing the one-way valve is formed in the drill bit, the grouting pipe penetrates through the second side hole and is communicated with the one-way valve, so that concrete backflow is avoided, the purpose of releasing harmful gas in a shield zone in advance is achieved, the safety risk of underground shield construction of a subway is reduced, the contradiction between construction and ground traffic untwining is relieved to the maximum extent, the ground subsidence problem is eliminated, and the potential safety hazard caused by the harmful gas in the tunnel shield construction of the subway engineering is relieved to the maximum extent; through setting up a section of thick bamboo dado, set up the drill bit in a section of thick bamboo bottom of protecting, the drilling rod is located a section of thick bamboo of protecting, set up the baffle in a section of thick bamboo of protecting, drill bit and baffle cooperation form and be used for guiding harmful gas exhaust to hold the chamber, harmful gas gets into through the air vent and holds the chamber, rethread air duct is discharged, utilize the slip casting pipe to carry concrete to harmful gas accumulation position simultaneously, fill the space, furthest lightens the potential safety hazard that causes by harmful gas in the subway engineering tunnel shield construction, avoid ground subsidence, through setting up the water injection pipe, utilize the water injection pipe to wash the air vent, avoid the air vent to block up.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (5)
1. The underground harmful gas prevention method for preventing road settlement in subway tunnel construction is characterized by comprising the following steps of:
step one, ground excavation: an excavation layer (24) having a depth of 2m to 4m is excavated on the ground just above the air bag (22);
step two, drilling a first drilling hole and a second drilling hole: drilling a first drilling hole (25) with the depth of 3m to 5m at the center position of the bottom of the excavation layer (24) by using a first drilling rod, and drilling a second drilling hole (26) with the depth of 4m to 8m at the center position of the bottom of the first drilling hole (25) by using a second drilling rod;
the aperture of the second bore (26) is smaller than the aperture of the first bore (25);
step three, reinforcing the hole wall, namely extending a drilling tool into the center of the bottom of a hole of a second drilling hole (26), and filling a supporting filling body (27) between the drilling tool and the first drilling hole (25) and between the drilling tool and the second drilling hole (26), wherein the top of the supporting filling body (27) is higher than Kong Dinggao degrees of the first drilling hole (25);
the drilling tool comprises a protective cylinder (1) and a drill bit (2) arranged at the bottom of the protective cylinder (1), a partition plate (3) is horizontally arranged at the lower side in the protective cylinder (1), a central hole (18) and a first side hole (15), a second side hole (16) and a third side hole (17) which are all arranged at the outer side of the central hole (18) are formed in the partition plate (3), a drill rod (4) penetrates through the central hole (18) to be connected with the drill bit (2), one end, far away from the drill bit (2), of the drill rod (4) is connected with a drilling machine (30), an air duct (5) is communicated with the first side hole (15), a vertical through hole for installing a one-way valve (10) is formed in the drill bit (2), a grouting pipe (6) penetrates through the second side hole (16) to be communicated with the one-way valve (10), a water injection pipe (7) is communicated with the third side hole (17), the protective cylinder (1), the drill bit (2) and the partition plate (3) are matched to form a containing cavity for guiding harmful gas to be discharged, and the bottom of the protective cylinder (1) is provided with a plurality of air ducts, and the air ducts are communicated with the first side air duct (15;
one end of the air duct (5) extending out of the pile casing (1) is connected with an air collecting bag (28), one end of the grouting pipe (6) extending out of the pile casing (1) is connected with a concrete storage tank (29) for storing concrete (23), and one end of the water injection pipe (7) extending out of the pile casing (1) is connected with a water storage tank (31);
an exhaust valve (11) and a pressure gauge (12) are arranged at the position of the air duct (5) extending out of the pile casing (1), a grouting valve (13) is arranged at the position of the grouting pipe (6) extending out of the pile casing (1), and a water injection valve (14) is arranged at the position of the water injection pipe (7) extending out of the pile casing (1);
step four, drilling a third drilling hole: closing the exhaust valve (11), the grouting valve (13) and the water injection valve (14), and driving the drill rod (4) by the drilling machine (30), and driving the drill bit (2) to drill a third drilling hole by the drill rod (4) until the drill bit (2) stretches into the air bag (20);
the aperture of the third bore is smaller than the aperture of the second bore (26);
fifth, the air bag is exhausted and filled: harmful gas in the air bag (20) enters the accommodating cavity through the gas guide hole and then enters the gas guide pipe (5), the pressure in the gas guide pipe (5) is increased, the pressure gauge (12) displays a pressure value, the exhaust valve (11) and the grouting valve (13) are opened simultaneously, the gas collecting bag (28) collects the harmful gas output by the gas guide pipe (5), the grouting pump pumps concrete to the grouting pipe (6) in the concrete storage tank (29), wherein the grouting pressure is larger than the pressure data displayed by the pressure gauge (12), the position of the concrete entering the air bag (20) is ensured, when the data of the pressure gauge (12) is reduced or lowered, the water injection valve (14) is opened, the gas guide hole is cleaned by the water injection pipe (7), the blocking of the gas guide hole is avoided until the discharge of the harmful gas in the air bag is completed, and the filling of the air bag (20) is realized;
step six, lifting a drill and backfilling the drill hole: lifting drilling tools, pumping concrete into the grouting pipe (6) by a grouting pump in the concrete storage tank (29), backfilling the drilled holes, forming concrete reinforcing bodies (32) by concrete in the air bags, concrete in the third drilled holes, concrete in the second drilled holes, concrete in the first drilled holes and supporting filling bodies (27), and realizing harmful gas prevention and treatment, namely stratum reinforcement and road settlement prevention.
2. The method for preventing and controlling harmful gas under subway tunnel construction, which is used for preventing road settlement, according to claim 1, is characterized in that: a first filter screen (8) is arranged at the position of the air guide hole in the casing (1).
3. The method for preventing and controlling harmful gas under subway tunnel construction, which is used for preventing road settlement, according to claim 1, is characterized in that: a second filter screen (9) is arranged in the first side hole (15).
4. The method for preventing and controlling harmful gas under subway tunnel construction, which is used for preventing road settlement, according to claim 1, is characterized in that: the gas collection bag (28) is a FEP Teflon gas sampling bag.
5. The method for preventing and controlling harmful gas under subway tunnel construction, which is used for preventing road settlement, according to claim 1, is characterized in that: the supporting filling body (27) is a broken stone supporting filling body.
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| CN113958333B true CN113958333B (en) | 2023-05-26 |
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| CN110863858A (en) * | 2019-11-13 | 2020-03-06 | 中铁十局集团有限公司 | Outburst prevention control program and outburst prevention method for high-pressure harmful gas of non-coal-series stratum tunnel |
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