Gas collecting device for gas escaped from fault soil for earthquake precursor observation

Abstract

The utility model discloses a gas collecting device for gas escaped from fault soil for earthquake precursor observation, which comprises a gas collecting bin, a gas guide pipe and a rubber plug, the gas guide pipe is communicated with the gas collecting bin, the top of the gas guide pipe is sealed by the rubber plug and exposed out of the ground, the gas collecting bin is buried underground, and the bottom end of the gas collecting bin is open. The gas sampling device is high in gas production rate, long in service life and good in gas tightness, improves the stability, accuracy and reliability of observation of gas escaped from fault soil, can be used in cooperation with various gas analysis instruments, provides real, effective and fresh underground deep gas for the various gas analysis instruments, forms a complete gas observation system, and is suitable for popularization and application. The method is used for fault soil escape gas observation points and station network construction, and is beneficial to obtaining effective gas parameters with scientific research significance.

Description

Technical Field

[0001] The utility model relates to the technical field of seismic observation, in particular to a gas collecting device for fault soil escaped gas used for earthquake precursor observation. Background Technique

[0002] Earthquakes often cause serious casualties, bringing catastrophic disasters and posing a huge threat to the safety of human life and property. Therefore, it is of great significance to improve the accuracy and scientific nature of earthquake prediction ability. Earthquakes and tectonic activities can cause the release of underground gases. Therefore, underground gases often carry information about the changes in the deep underground, have strong sensitivity to faults and tectonic activities, and there is a close connection between their abnormal changes and tectonic activities. Underground gases include gases escaped from groundwater and soil. China started the observation work of gases escaped from groundwater earlier. Now, gases such as radon, mercury, carbon dioxide and hydrogen in fault soil gas are widely used in the research of fault activity and fault structure characteristics. In recent years, earthquake cases have shown that observing the escaped soil gas of faults is one of the relatively effective ways for earthquake precursor prediction.

[0003] Reasonably designing and constructing the gas collecting device in the observation hole (well) of soil escaped gas is one of the important conditions to ensure that the soil escaped gas observation network can effectively capture earthquake precursors. The observation hole of soil escaped gas is usually built on the hanging wall of the fault or the active plate of fault activity. Therefore, it is often called the escaped gas of fault / rupture zone soil. A reasonable design of the fault gas collecting device on the observation well hole can more effectively reflect the situation of gas released from the deep crust and effectively avoid the interference of the surrounding environment. Since the observation of fault soil escaped gas is a long-term observation project, the gas collecting device of the observation hole should not only meet the supply of fresh gas in design, but also consider problems such as stability and service life for long-term use. At present, a part of the observation holes (wells) of fault soil escaped gas are transformed from groundwater observation holes, but the gas collecting devices therein are not suitable for soil observation conditions, gas observation instruments, etc., and have defects such as relatively low gas extraction rate, blockage or air leakage of the observation hole, which affect the stability and reliability of the observation of fault soil escaped gas.

[0004] In view of the above problems, the utility model provides a gas collecting device for fault soil escaped gas used for earthquake precursor observation with a high gas extraction rate and a long service life. Content of the Utility Model

[0005] The utility model provides a gas collecting device for fault soil escaped gas used for earthquake precursor observation with a high gas extraction rate and a long service life.

[0006] The purpose of the present utility model is to provide a gas collection device for fault soil escaping gas used in earthquake precursor observation, which includes a gas collection chamber, a gas guide pipe, and a rubber stopper. The gas guide pipe is communicated with the gas collection chamber. The top of the gas guide pipe is sealed with a rubber stopper and exposed on the ground. The gas collection chamber is buried underground, and the bottom end of the gas collection chamber is set to be open.

[0007] Further, a breathable layer is provided outside the gas collection chamber, with a height of half of the gas collection chamber. The diameter of the gas collection chamber is 50 cm, the height is 60 cm, and the wall thickness is 4 mm. The gas collection chamber is a polyvinyl chloride gas pipe.

[0008] Further, the outside of the gas guide pipe is backfilled with backfill soil to fix the gas guide pipe.

[0009] The present utility model has the following advantages: The present utility model has a high gas collection rate, a long service life, good airtightness, improves the stability, accuracy, and reliability of the fault soil escaping gas, and can be used in cooperation with a variety of gas analyzers, providing real and fresh underground deep gas for a variety of gas analyzers, forming a complete gas observation system, used for the construction of fault zone soil escaping gas observation points and networks, and is conducive to obtaining earthquake prediction parameters with seismogenic physical significance. Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of the present utility model.

[0011] In the figure: 1. Gas guide pipe; 2. Backfill soil; 3. Breathable layer; 4. Gas collection chamber; 5. Instrument probe; 6. Rubber stopper. Detailed Embodiment

[0012] The present utility model provides a gas collection device for fault soil escaping gas used in earthquake precursor observation, which includes a gas collection chamber 4, a gas guide pipe 1, and a rubber stopper 6. The gas guide pipe 1 is communicated with the gas collection chamber 4. The top of the gas guide pipe 1 is sealed with a rubber stopper 6 and exposed on the ground. The gas collection chamber 4 is buried underground, and the bottom end of the gas collection chamber 4 is set to be open.

[0013] In this embodiment, a breathable layer 3 is provided outside the gas collection chamber 4, with a height of half of the gas collection chamber 4. The diameter of the gas collection chamber 4 is 50 cm, the height is 60 cm, and the wall thickness is 4 mm. The gas collection chamber 4 is a polyvinyl chloride gas pipe.

[0014] In this embodiment, the outside of the gas guide pipe 1 is backfilled with backfill soil 2 to fix the gas guide pipe 1.

[0015] In this embodiment, the air duct 1 is connected to the gas collecting chamber 4, and the top of the air duct 1 is closed and exposed above the ground. The general air permeable layer 3 is arranged at a depth of 3 to 5 meters underground. The air permeable layer 3 is a cylinder with a diameter greater than 50 cm and a height of 35 cm, which is mainly formed by neatly stacking gravel with the same particle size and a diameter of about 2 to 5 cm. The gravel selected is clean cobblestones. The gas collecting chamber 4 is vertically inserted into the air permeable layer 3 and located at the center of the air permeable layer 3. The cobblestones are submerged to half of the height of the gas collecting chamber 4. The gas collecting chamber 4 is a polyvinyl chloride pipe with a diameter of 50 cm, a height of 60 cm, and a wall thickness of 4 mm. The bottom end of the gas collecting chamber 4 is open, and there is a certain distance between the bottom end of the gas collecting chamber 4 and the bottom surface of the air permeable layer 3, generally 5 cm, that is, the bottom end of the gas collecting chamber 4 cannot directly touch the bottom of the observation well hole. As Figure 1 shown, the air duct 1 is communicated with the gas collecting chamber 4, and the material is the same as that of the gas collecting chamber 4, which is also a polymer material pipe, made of PVC material, which can ensure a certain pressure resistance and at the same time has the function of preventing insects and ants from biting and corroding. After the gas collecting chamber 4 and the air duct 1 are installed, they are backfilled with backfill soil 2 around them and above the air permeable cover to fix the air duct 1 device and ensure that the air duct 1 is perpendicular to the ground. During the backfilling process, for every 20 cm of backfilling, compaction operation is required to prevent the backfill soil 2 from collapsing. The gas escaping from the fault soil flows through the air permeable layer 3 into the gas collecting chamber 4, and then flows into the air duct 1. The instrument probe 5 in the air duct 1 transports the collected gas escaping from the fault soil to the gas analysis instrument.

[0016] In this embodiment, the gas escaping from the fault soil flows through the air permeable layer 3 into the gas collecting chamber 4, and then flows into the air duct 1. The instrument probe 5 in the air duct 1 transports the collected gas escaping from the fault soil to the gas analysis instrument.

[0017] Although the specific implementation manners of the present utility model have been described in detail with reference to the accompanying drawings, it should not be construed as a limitation to the protection scope of this patent. Within the scope described in the claims, various modifications and deformations that can be made by those skilled in the art without creative labor still fall within the protection scope of this patent.

Claims

1. A gas collection device for fault soil escaping gas in earthquake precursor observation, comprising a gas collection chamber, a gas guide pipe and a rubber stopper, characterized in that: The air duct is communicated with the gas collecting bin. The top of the air duct is sealed with a rubber stopper and exposed above the ground. The gas collecting bin is buried underground, and the bottom end of the gas collecting bin is open. An air permeable layer is provided outside the gas collecting bin, with a height of half of the gas collecting bin. The diameter of the gas collecting bin is 50 cm, the height is 60 cm, and the wall thickness is 4 mm. The gas collecting bin is a polyvinyl chloride gas pipe. The outside of the air duct is backfilled with backfill soil to fix the air duct.

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