CN113417628A - Continuous detection and release method based on drilling machine shallow harmful gas detection device - Google Patents
Continuous detection and release method based on drilling machine shallow harmful gas detection device Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 72
- 238000005553 drilling Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000000523 sample Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000002689 soil Substances 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 230000001681 protective effect Effects 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 75
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 16
- 238000010276 construction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 206010047700 Vomiting Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
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Abstract
The invention discloses a continuous detection and release method based on a drilling machine shallow harmful gas detection device; the detection device comprises a probe rod, an air guide hose, a multifunctional air tank, a double-layer pipe and a drill rod; pre-drilling, and then knocking the double-layer pipe and the probe rod into the deepest area to be detected in the plurality of areas to be detected by adopting a hammering method; the core tube and the conical guide head extend into the area to be detected, and the probe rod and the core tube protection tube form sealing with the soil layer above the area to be detected; and (3) allowing the gas in the region to be detected to enter the multifunctional gas tank, detecting harmful gas, pulling up the double-layer pipe to the adjacent region to be detected above after the release is finished, and repeating the steps until the detection and the release of the harmful gas in all the regions to be detected are finished. The invention can continuously detect a plurality of areas to be detected and release harmful gas, has obvious advantages on water, and successfully overcomes the defects of the prior art of sectional implementation, detection and drilling cross operation; the detection operation of the shallow harmful gas is more convenient, the cost performance is higher, the safety and the reliability are realized, and the harmful gas is released more safely.
Description
Technical Field
The invention relates to the technical field of shallow harmful gas detection and release, in particular to a continuous detection and release method based on a drilling machine shallow harmful gas detection device.
Background
In shallow methane generally developed in a quaternary stratum like the coastal region of southeast of China, the methane is distributed sporadically and is locally enriched. The methane is combustible and has certain pressure, and is one of geological disasters possibly encountered by underground engineering, for example, a sewage discharge tunnel at the mouth of a Yangtze river in Shanghai, and the tunnel is broken due to the sudden surge of the gas in the shallow underground layer; the accident of ship damage and death caused by underground shallow gas eruption in the construction of the Hangzhou bay sea-crossing bridge pile foundation. A foundation pit of a working well on the long river side is excavated to a designed elevation, and methane is sprayed out when the foundation is poured to influence the foundation construction.
The existence of underground shallow methane can form potential safety hazards such as gushing and sand running for the construction of underground engineering (such as pile foundation, foundation pit, shield, and the like), and when shield tunneling construction operation is carried out, underground harmful gas can be released to cause instability of an underlying soil layer, so that a built tunnel is displaced and broken; meanwhile, when the biogas is contacted with air to reach a certain concentration, explosion accidents can be caused, the biogas is inflammable and harmful to human bodies, mild people cause nausea and vomiting, severe people can cause death or poisoning, and the construction risk is high.
Although there has been a disclosure of land-based biogas detection technology in the prior art, such as the utility model patent publication No. 201225967Y, "manufacturing technology of underground shallow harmful gas exploration tester", this technology uses static sounding instruments to press in test equipment to realize biogas pressure, flow and gas composition.
However, in practical application, the static sounding construction on water is difficult, the cost is expensive, the cost performance is not high, the implementation risk is also high, and the probe rod is easy to break under large waves, so that the risk of biogas leakage can be generated.
The invention of the invention patent CN201911110633.7 'shallow harmful gas detection device based on drilling equipment and a use method thereof' realizes convenient operation, high cost performance, safety and reliability of detection of the harmful gas on the water shallow layer. But the drilling and the methane detection are carried out in a crossed way, namely after the detection of 1 test section is finished, the drilling is carried out to the next target depth, and then the next target detection is carried out; meanwhile, the gas-isolating soil layer is considered, so that continuous detection cannot be realized.
Therefore, it is necessary to find the distribution of the gas in the shallow underground layer of the field before the construction of underground engineering, for example, the engineering experience in the Shanghai region, the methane distribution in the stratum of the quaternary period near Yangtze river and Huangpu river is relatively dense, the quantitative detection requirement for the methane on water is urgent, and the continuous detection and release are necessary.
Disclosure of Invention
In view of the above defects of the prior art, the invention provides a continuous detection and release method based on a drilling machine shallow harmful gas detection device, which aims to realize continuous, efficient and accurate detection of harmful gas pressure, flow and components, can implement release work, has obvious advantages on water, and successfully overcomes the defects of sectional implementation, detection and drilling cross operation in the prior art; the detection operation of the shallow harmful gas is more convenient, the cost performance is higher, the safety and the reliability are realized, the harmful gas is released more safely, and a large amount of water and soil loss can not be caused generally.
In order to achieve the aim, the invention discloses a continuous detection and release method based on a drilling machine shallow harmful gas detection device; the detection device comprises a probe rod, an air guide hose, a multifunctional air tank, a double-layer pipe and a drill rod; the detection device is arranged on a water operation platform, a water operation ship or a land area; the double-layer pipe is vertically arranged, and the upper end of the double-layer pipe is sequentially connected with the probe rod and the drill rod; the total length of the double-layer pipe and the probe rod is the sum of the detection depth of the deepest area to be detected and the depth of a pre-drilled hole; the upper end of the drill rod is positioned on the above-water work platform, the above-water work ship or the land area and is connected with the multifunctional gas tank through the gas guide hose; the inner layer of the double-layer pipe is a core pipe, and the outer layer of the double-layer pipe is a core pipe protection pipe; the outer diameter of the core tube is in clearance fit with the inner diameter of the core tube protection tube, and the core tube can slide in a reciprocating manner along the length direction of the core tube protection tube; the lower end of the core tube is provided with a conical guide head; the outer wall of the core pipe is a breathable inner pipe with a filter screen; when the detection device is knocked into a soil layer to be detected, the core tube protective tube, the probe rod and a closed soil layer above the soil layer to be detected form sealing; the steps of the continuous probing and releasing method are as follows:
if not, observing the pressure gauge with a large measuring range of the multifunctional gas tank, if the pressure is less than 0.1MPa, simultaneously opening the valves of the pressure gauge with a large measuring range and the pressure gauge with a small measuring range, and stopping observation after the pressure is stable;
7, after the pressure is observed, starting deflation, if the flow and the components need to be measured, connecting a flowmeter through a deflation interface of the multifunctional gas tank, and collecting a gas sample; if the flow rate and the components do not need to be measured, the air can be discharged through the air tank or the air guide hose is detached for direct air discharge;
and 8, pulling up the double-layer pipe to the area to be detected which is adjacent to the area to be detected above the area to be detected and is deflated, repeating the steps 4 to 8, and continuously detecting each area to be detected until the harmful gas detection and release of all the areas to be detected are completed.
The regions to be detected may be distributed continuously or intermittently.
Preferably, the detection device is arranged on a water operation platform, a water operation ship or a land area;
the upper end of the drill rod is positioned on the above-water work platform, the above-water work ship or the land area.
Preferably, the upper end of the core tube protection tube is connected with the lower end of the probe rod.
Preferably, the upper end of the core tube is provided with a flange structure which is turned outwards; the lower end of the core tube protection tube is provided with a retaining shoulder which is turned inwards corresponding to the flange structure.
Preferably, a sealing ring is arranged at the joint of the lower end of the core tube and the conical guide head, and when the core tube is retracted into the core tube protection tube, the sealing ring seals a gap between the core tube and the core tube protection tube.
Preferably, the double-layer pipe is connected with the probe rod, a conversion joint is arranged between the probe rod and the drill rod, and the probe rod is connected with the drill rod through the conversion joint.
Preferably, a drill rod hose adapter is arranged between the drill rod and the air guide hose, and the drill rod and the air guide hose are connected through the drill rod hose adapter.
Preferably, in the step 6, it is observed that all pressure gauges of the multifunctional gas cylinder reach a steady state.
Preferably, the multifunctional gas tank comprises 2 pressure gauges with different measuring ranges, a tank body, a gas inlet, a gas outlet and a muddy water discharge outlet;
the multifunctional gas tank can realize measurement of different pressures, a valve of the pressure gauge with a large measuring range is opened, and if the pressure is less than 0.1MPa, a valve of the pressure gauge with a small measuring range is opened, so that accurate measurement of the pressure of the harmful gas in the shallow layer is realized; the discharge of harmful gas and mud is realized through the exhaust port arranged at the top and the mud water discharge port arranged at the bottom of the tank.
More preferably, the pressure gauge, the exhaust port and the muddy water discharge port having 2 different strokes are provided with valves.
The invention has the beneficial effects that:
the invention realizes the continuous detection and gas release method of the shallow harmful gas detection device based on the drilling equipment, forms a set of complete innovative exploration process, can continuously detect and release the harmful gas in a plurality of areas to be detected from bottom to top; the regions to be detected can be distributed continuously or discontinuously; the device realizes continuous, efficient and accurate detection of the pressure, flow and components of the harmful gas, can implement release work, has obvious advantages on water, and successfully overcomes the defects of sectional implementation, detection and drilling cross operation in the prior art; the detection operation of the shallow harmful gas is more convenient, the cost performance is higher, the safety and the reliability are realized, the harmful gas is released more safely, and a large amount of water and soil loss can not be caused generally.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 shows a schematic structural diagram of a detection device in an embodiment of the present invention.
Fig. 2 shows a schematic structural view of a double tube in an embodiment of the present invention.
Fig. 3 is a schematic structural view showing a core tube in a double tube in an extended state according to an embodiment of the present invention.
Fig. 4 shows a schematic view of the structure of a multifunctional gas cylinder in use according to an embodiment of the present invention.
FIG. 5 illustrates a flow chart of continuous probing and release of an embodiment of the present invention.
FIG. 6 is a diagram illustrating a state where step one is performed during use according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating a state where step two is performed during use according to an embodiment of the present invention.
FIG. 8 is a schematic diagram of an in-process state when step three is performed during use in accordance with an embodiment of the present invention.
Detailed Description
Examples
As shown in fig. 1 to 3, a specific embodiment of the continuous detection and release method based on a drilling machine shallow harmful gas detection device of the present invention.
The detection device comprises a probe rod 1, an air guide hose 2, a multifunctional air tank 3, a double-layer pipe 4 and a drill rod 5. The detection device is arranged on a water operation platform, a water operation ship or a land area 9;
the double-layer pipe 4 is vertically arranged, and the upper end of the double-layer pipe is sequentially connected with the probe rod 1 and the drill rod 5; the total length of the double-layer pipe 4 and the probe rod 1 is the sum of the detection depth of the deepest area to be detected and the depth of a pre-drilled hole;
the upper end of the drill rod 5 is positioned on an above-water operation platform, an above-water operation ship or a land area 9 and is connected with the multifunctional gas tank 3 through the gas guide hose 2;
the inner layer of the double-layer pipe 4 is a core pipe 42, and the outer layer is a core pipe protective pipe 41;
the outer diameter of the core tube 42 is in clearance fit with the inner diameter of the core tube protection tube 41 and can slide back and forth along the length direction of the core tube protection tube 41;
the lower end of the core tube 42 is provided with a conical guide head 43;
the outer wall of the core tube 42 is a breathable inner tube 46 with a filter screen 45;
when the detection device is knocked into a soil layer 7 to be detected, the core tube protective tube 41, the probe rod 1 and the closed soil layer 6 above the soil layer 7 to be detected form sealing;
the steps of the continuous probing and releasing method are as follows:
2, sequentially connecting a probe rod 1 and a drill rod 5 at the upper end of the double-layer pipe 4, and placing the double-layer pipe into a drill hole 8;
if not, observing the pressure gauge with a large measuring range of the multifunctional gas tank 3, if the pressure is less than 0.1MPa, simultaneously opening the valves of the pressure gauge with a large measuring range and the pressure gauge with a small measuring range, and stopping the observation after the pressure is stable;
and 8, pulling up the double-layer pipe 4 to the adjacent to-be-detected area 7 above the to-be-detected area 7 after the deflation is finished, and repeatedly executing the steps 4 to 8 to continuously detect each to-be-detected area 7 until the harmful gas detection and release of all to-be-detected areas 7 are finished.
The regions to be detected 7 may be distributed continuously or intermittently.
The principle of the invention is as follows:
the invention is an innovative process for continuously detecting and releasing a shallow harmful gas detection device based on drilling equipment; when the detection device is knocked into the bottom of the preset detection depth, the detection device is pulled out for a certain length and detects and releases harmful gas every time according to actual needs, so that the harmful gas is continuously detected and released from the bottom upwards; the regions to be detected can be distributed continuously or discontinuously; a set of complete innovative exploration process is formed, the accurate detection of the pressure, flow and components of the harmful gas is realized continuously and efficiently, the releasing work can be implemented, the method has obvious advantages on water, and the defects of the sectional implementation, detection and drilling cross operation in the prior art are successfully overcome; the detection operation of the shallow harmful gas is more convenient, the cost performance is higher, the safety and the reliability are realized, the harmful gas is released more safely, and a large amount of water and soil loss can not be caused generally.
The multifunctional gas tank 3 can measure harmful gases with different pressures, is convenient for measuring the flow of the harmful gases and sampling the gases, and can release the harmful gases and discharge slurry and water.
In some embodiments, the upper end of the core tube protection tube 41 is connected to the lower end of the probe rod 1.
In some embodiments, the upper end of the core tube 42 is provided with an outwardly turned flange structure; the lower end of the core tube protection tube 42 is provided with an inward-folded retaining shoulder 44 corresponding to the flange structure.
In some embodiments, a sealing ring 47 is provided at the connection between the lower end of the core tube 42 and the tapered guide head 43, and the sealing ring 47 seals the gap between the core tube 42 and the core tube protection tube 41 when the core tube 42 is retracted into the core tube protection tube 41.
In some embodiments, the double-layer tube 4 is connected with the probe rod 1, an adapter is arranged between the probe rod 1 and the drill rod 5, and the probe rod 1 and the drill rod 5 are connected through the adapter.
In some embodiments, a drill pipe hose adapter is provided between the drill pipe 5 and the air guide hose 2, and the drill pipe 5 and the air guide hose 2 are connected by the drill pipe hose adapter.
In certain embodiments, in step 6, it is observed that all pressure gauges of the multi-functional gas tank 3 reach a steady state.
As shown in fig. 4, in some embodiments, the multifunctional gas tank 3 includes 2 different-stroke pressure gauges 31, a tank body 32, a gas inlet 33, a gas outlet 34, and a muddy water discharge port 35;
the multifunctional gas tank 3 can realize the measurement of different pressures, the valve of the pressure gauge 31 with a large measuring range is opened firstly, and if the pressure is less than 0.1MPa, the valve of the pressure gauge 31 with a small measuring range is opened, so that the pressure of the harmful gas in the shallow layer can be accurately measured; the discharge of harmful gas and mud is realized by arranging a gas outlet 34 at the top and a mud water discharge outlet 35 at the bottom of the tank.
In some embodiments, 2 different stroke pressure gauges 31, vent 34 and muddy water discharge port 35 are provided with valves.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. A continuous detection and release method based on a drilling machine shallow harmful gas detection device; the method is characterized in that: the detection device comprises a probe rod (1), an air guide hose (2), a multifunctional air tank (3), a double-layer pipe (4) and a drill rod (5);
wherein the detection device is arranged on a water work platform, a water work ship or a land area (9);
the double-layer pipe (4) is vertically arranged, and the upper end of the double-layer pipe is sequentially connected with the probe rod (1) and the drill rod (5); the total length of the double-layer pipe (4) and the probe rod (1) is the detection depth of the deepest area to be detected minus the pre-drilling depth;
the upper end of the drill rod (5) is positioned on the above-water work platform, the above-water work ship or the land area (9) and is connected with the multifunctional gas tank (3) through the gas guide hose (2);
the inner layer of the double-layer pipe (4) is a core pipe (42), and the outer layer is a core pipe protection pipe (41);
the outer diameter of the core tube (42) is in clearance fit with the inner diameter of the core tube protective tube (41), and the core tube protective tube can slide in a reciprocating manner along the length direction of the core tube protective tube (41);
the lower end of the core tube (42) is provided with a conical guide head (43);
the outer wall of the core pipe (42) is a breathable inner pipe (46) with a filter screen (45);
when the detection device is knocked into a soil layer (7) to be detected, the core tube protective tube (41), the probe rod (1) and a closed soil layer (6) above the soil layer (7) to be detected form sealing;
the steps of the continuous probing and releasing method are as follows:
step 1, vertically drilling a hole above the closed soil layer (6) by using a drilling machine to form a drilling hole (8); the thickness of the closed soil layer (6) is not less than 1 meter;
2, sequentially connecting the probe rod (1) and the drill rod (5) at the upper end of the double-layer pipe (4), and placing the probe rod and the drill rod into a drill hole (8);
step 3, knocking the double-layer pipe (4) and the probe rod (1) into the soil layer (7) to be detected by adopting a hammering method, and penetrating through a plurality of areas to be detected with different depths in the soil layer (7) to be detected until the deepest area to be detected;
step 4, sequentially connecting the air guide hose (2) and the multifunctional air tank (3) to the upper end of the drill rod (5);
step 5, pulling up the drill rod (5) for not less than 0.5 m, and moving the core tube protective tube (41) of the double-layer tube (4) upwards to enable the core tube (42) to move oppositely relative to the core tube protective tube (41) so as to communicate with the area to be detected; at the moment, the double-layer pipe (4) and the probe rod (1) are combined with the closed soil layer (6) and the soil layer above the corresponding area to be detected to form sealing, and the gas in the area to be detected enters the multifunctional gas tank (3) through the double-layer pipe (4), the probe rod (1), the drill rod (5) and the gas guide hose (2);
step 6, whether the gas in the area to be detected only releases harmful gas or not is judged; if yes, skipping the subsequent steps and executing step 7;
if not, observing the pressure gauge with a large measuring range of the multifunctional gas tank (3), if the pressure is less than 0.1MPa, simultaneously opening the valves of the pressure gauge with a large measuring range and the pressure gauge with a small measuring range, and stopping observation after the pressure is stable;
7, after the pressure is observed, starting deflation, if the flow and the components need to be measured, connecting a flowmeter through a deflation interface of the multifunctional gas tank (3), and collecting a gas sample; if the flow rate and the components do not need to be measured, the air can be discharged through the air tank or the air guide hose (2) is detached for direct air discharge;
and 8, pulling up the double-layer pipe (4) to another area to be detected which is adjacent to the area to be detected and above the area to be detected and is deflated, repeating the steps 4 to 8, and continuously detecting each area to be detected until the harmful gas detection and release of all the areas to be detected are completed.
2. The continuous detecting and releasing method based on the harmful gas detecting device of the shallow layer of the drilling machine according to the claim 1, characterized in that the upper end of the core tube protecting tube (41) is connected with the lower end of the probe rod (1).
3. The continuous detection and release method based on the drilling machine shallow harmful gas detection device according to claim 1, characterized in that the upper end of the core tube (42) is provided with an outwardly turned flange structure; the lower end of the core tube protective tube (42) is provided with a retaining shoulder (44) which is turned inwards corresponding to the flange structure.
4. The continuous detecting and releasing method based on the drilling machine shallow harmful gas detecting device according to the claim 1, characterized in that the connection between the lower end of the core tube (42) and the conical guiding head (43) is provided with a sealing ring (47), when the core tube (42) retracts into the core tube protecting tube (41), the sealing ring (47) seals the gap between the core tube (42) and the core tube protecting tube (41).
5. The continuous detection and release method based on the drilling machine shallow harmful gas detection device is characterized in that the double-layer pipe (4) is connected with the probe rod (1), a conversion joint is arranged between the probe rod (1) and the drill rod (5), and the probe rod (1) and the drill rod (5) are connected through the conversion joint.
6. The continuous detection and release method based on the harmful gas detection device in the shallow layer of the drilling machine according to claim 1, characterized in that a drill pipe hose adapter is arranged between the drill pipe (5) and the air guide hose (2), and the drill pipe (5) and the air guide hose (2) are connected through the drill pipe hose adapter.
7. The continuous detection and release method based on the drilling machine shallow harmful gas detection device according to the claim 1, characterized in that in the step 6, all pressure gauges of the multifunctional gas tank (3) are observed to reach a steady state.
8. The continuous detection and release method based on the drilling machine shallow harmful gas detection device according to claim 1, characterized in that the multifunctional gas tank (3) comprises 2 different-stroke pressure gauges (31), a tank body (32), a gas inlet (33), a gas outlet (34) and a muddy water discharge port (35);
the multifunctional gas tank (3) can realize measurement of different pressures, a valve of the pressure gauge (31) with a large measuring range is opened, and if the pressure is less than 0.1MPa, a valve of the pressure gauge (31) with a small measuring range is opened, so that accurate measurement of the pressure of the harmful gas in the shallow layer is realized; the discharge of harmful gas and mud is realized by arranging the gas outlet (34) at the top and the mud water discharge outlet (35) at the bottom of the tank.
9. The continuous detecting and releasing method based on the harmful gas detecting device of the shallow layer of the drilling machine according to the claim 8, characterized in that the pressure gauge (31), the exhaust port (34) and the muddy water exhaust port (35) with 2 different measuring ranges are all provided with valves.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114442187A (en) * | 2022-01-27 | 2022-05-06 | 杭州市勘测设计研究院有限公司 | Shallow harmful gas surveying device and method |
| CN115100821A (en) * | 2022-07-22 | 2022-09-23 | 国网新疆电力有限公司克州供电公司 | Device for monitoring operation environment in process of excavating foundation pit |
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