Shallow gas automatic detection device and detection method based on engineering investigation drilling equipment

Abstract

The invention discloses a shallow gas automatic detection device and method based on engineering investigation drilling equipment. The shallow gas automatic detection device comprises a sealing component, a jacking component and a counter-force component. The sensing control component comprises a gas sensor installed on the inner side of the drill rod casing and an independently-arranged controller, and the gas sensor is used for detecting the shallow gas concentration and transmitting sensing information to the controller. In the drilling process, when the concentration of shallow gas in a drill pipe sleeve exceeds an alarm threshold value of a sensor, an automatic control system (controller) starts a jacking component to quickly close a sealing cover, the shallow gas in the drill pipe sleeve is guided to a gas guide pipe and a gas guide hose and then enters a barometer and a gas collection box, and gas pressure measurement and gas collection are achieved; the problem that an existing shallow gas detection device developed on the basis of static sounding equipment is poor in applicability in water area exploration construction is solved.

Description

Technical Field

[0001] The invention relates to the technical field of engineering survey, and in particular to an automatic shallow gas detection device and a detection method based on engineering survey drilling equipment. Background Art

[0002] my country's underground space development is developing rapidly, and projects such as rail transit tunnels, building basements, and underground municipal facilities have been developed and applied in large quantities. According to existing experience, shallow underground gas, mainly biogas, is often detected during engineering surveys and foundation pit excavation in coastal areas. If reasonable engineering measures are not taken, shallow gas can easily form dangerous situations such as sudden surges and quicksand during the construction or operation phase; at the same time, biogas is toxic and flammable, and when it reaches a certain concentration, it can cause poisoning or explosion accidents, seriously threatening the safety of on-site personnel and posing considerable construction risks.

[0003] In the past, due to the limitation of technical means, the work in the engineering survey stage often did not include gas detection in the soil layer. In recent years, with the needs of engineering construction, people have developed static penetration probes that integrate gas detection, air pressure measurement, gas storage and other functions, achieving the purpose of efficiently detecting shallow gas in the engineering survey stage (see patents with announcement numbers CN211122858U and CN218382328U). However, due to the difficulty of static penetration on water, low cost performance, and easy breakage of the probe rod, the above-mentioned types of technical equipment are generally only suitable for shallow gas detection in onshore surveys.

[0004] At present, the shallow gas detection technology that can be used in the survey stage of water engineering is still relatively limited. Publication No. CN110656926A discloses a shallow gas detection device based on drilling equipment. However, this technology has two limitations: 1. The drilling equipment lacks shallow gas early warning devices and anti-leakage devices. If shallow gas leaks during the drilling process, it will pose a threat to the personal safety of construction workers; 2. The shallow gas detection equipment can only be inserted after drilling to a predetermined depth. The differences and variability of actual strata often make it impossible to accurately judge the actual occurrence depth of shallow gas before survey and construction. During construction, it may be necessary to replace equipment multiple times, which reduces construction efficiency and affects the progress of the project, and is not conducive to the accuracy of the test results. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic shallow gas detection device and detection method based on engineering survey drilling equipment, aiming to overcome the limitations of the prior art in shallow gas detection and collection.

[0006] The object of the present invention is achieved as follows: an automatic shallow gas detection device based on engineering exploration drilling equipment, including a drill pipe and a drill pipe casing for casing the drill pipe, and also includes:

[0007] A gas collection box and a recovery pipeline, wherein the gas collection box is connected to the drill pipe casing through the recovery pipeline so that the shallow gas in the drill pipe casing can flow into the gas collection box;

[0008] A sealing component, comprising a base plate fixedly connected to the top of the drill pipe casing, and a pair of sealing covers relatively rotatably connected to the upper side of the base plate and capable of opening and closing. When collecting shallow gas, the two sealing covers are closed to seal the top of the drill pipe casing, and the base plate has a through hole for accommodating the drill pipe to pass through;

[0009] A lifting component and a reaction component, wherein the reaction component is fixedly connected to the drill pipe casing, the lifting component is fixedly connected to the reaction component and uses the reaction component as a reaction force support basis, the lifting component is configured as a structure that can be extended up and down, the lifting component is located directly above the two sealing covers, and when the sealing covers are closed, the lifting component extends downward and forces the two sealing covers to be in a closed state.

[0010] Furthermore, the sealing cover is elastically rotatably connected to the upper side of the base plate, and in the open state, the sealing cover is tilted upward based on its rotation connection point.

[0011] Furthermore, it also includes a sensor control component, which includes a gas sensor installed on the inner side of the drill pipe casing and an independently arranged controller. The gas sensor is used to detect the shallow gas concentration and transmit the sensor information to the controller. If the shallow gas concentration exceeds the threshold, the lifting component is in motion under the drive of the controller.

[0012] Furthermore, semicircular notches are provided on opposite sides of the two sealing covers, and in the closed state, the semicircular notches of the two sealing covers are combined into a circular hole structure that matches the cross-sectional circle of the drill rod.

[0013] Furthermore, the opposite sides of the sealing cover and its semicircular notch, as well as the lower surface of the sealing cover, are all equipped with airtight gaskets, which seal the gap between the two sealing covers, the gap between the semicircular notch of the sealing cover and the drill rod, and the gap between the sealing cover and the base plate when closed.

[0014] Furthermore, the downward pressure point of the lifting component is staggered with the semicircular notch of the sealing cover, and the lifting component is provided with one or two.

[0015] Furthermore, two lifting components are provided, the semicircular notch of the sealing cover is located at the center of the opposite side edges of the sealing cover, and the two lifting components are located at both sides of the drill rod.

[0016] Furthermore, the reaction force component includes a reaction frame and at least two support rods, and also includes two force transmission bases, the two force transmission bases respectively constitute the bottom of two lifting components, the top of the lifting component is connected to the reaction frame, the reaction frame is fixedly connected to the outer wall of the drill pipe casing through the support rods, and the reaction frame is provided with a gap to accommodate the drill pipe to pass through.

[0017] Furthermore, the recovery pipeline of the gas collection box includes an air pipe and a air hose. One end of the air pipe is connected to the drill pipe casing, the other end of the air pipe is connected to one end of the air hose, and the other end of the air hose is connected to the gas collection box. A barometer for detecting shallow gas pressure is installed on the air hose.

[0018] As another aspect of the present invention, a shallow gas detection method is proposed, comprising the following steps:

[0019] During drilling, keep the sealing cover in the sealing component open;

[0020] When the drill pipe and the drill pipe casing expose the shallow gas-bearing stratum, gas enters the drill pipe casing. When the shallow gas concentration in the drill pipe casing exceeds the threshold, the sensor control component is activated, and the lifting component is started. The lifting component presses down and closes the sealing cover to perform air-tight sealing on the top of the drill pipe casing, so that the shallow gas in the drill pipe casing can only enter the gas collection box through the recovery pipeline;

[0021] Perform air pressure measurement and gas collection.

[0022] The beneficial effects of the present invention are:

[0023] 1. The use of prefabricated equipment and easy and fast on-site installation improves the convenience and efficiency of construction. No additional bottom judgment or manpower operation is required. During the drilling construction, the shallow gas in the formation is automatically and efficiently detected and collected, which greatly improves the overall efficiency of the construction.

[0024] 2. Use gas sensors to warn of shallow gas leakage, automatically control the closing of sealing components, and start shallow gas detection and collection. During the drilling process, if the shallow gas concentration in the drill pipe casing exceeds the sensor alarm threshold, the automatic control system (controller) starts the lifting component to quickly close the sealing cover and guide the shallow gas inside the drill pipe casing to the gas guide pipe and gas guide hose, and then enter the barometer and gas collection box to achieve air pressure measurement and gas collection;

[0025] 3. There is no need to judge the shallow gas storage strata in advance, and shallow gas detection and collection can be achieved while drilling, which simplifies the complexity of construction;

[0026] 4. It solves the problem that the existing shallow gas detection device developed based on static detection equipment has poor applicability in water area survey and construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a system layout diagram of the present invention in an open state.

[0028] Figure 2 It is a system layout diagram of the present invention in a closed state.

[0029] Figure 3 It is a top view of the sealing component in the open state.

[0030] Figure 4 yes Figure 3 AA section view in.

[0031] Figure 5 It is a top view of the sealing component in the closed state.

[0032] Figure 6 yes Figure 5 BB section view in.

[0033] Figure 7 This is a diagram of the use status of the sensor control component when the sealing component is opened and closed.

[0034] Figure 8 It is a structural diagram of the reaction force component.

[0035] Explanation of the reference numerals: 1-drill rod; 2-drill rod casing; 3-sealing component, 3.1-base plate, 3.2-joint, 3.3-connector, 3.4-sealing cover, 3.5-airtight pad, 3.6-torsion spring; 4-sensing control component, 4.1-gas sensor, 4.2-sheathed wire, 4.3-controller; 5-lifting component; 6-reaction component, 6.1-reaction frame, 6.2-support rod, 6.3-force transmission base; 7-gas duct; 8-gas hose; 9-barometer; 10-gas collection box. DETAILED DESCRIPTION

[0036] The following will be combined with the attached embodiment of the present invention Figure 1-8 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] like Figure 1-2 As shown, a shallow gas automatic detection device based on engineering survey drilling equipment is proposed, comprising:

[0038] A drill rod 1, wherein the drill rod 1 is sleeved with a drill rod casing 2, and there is a gap between the drill rod casing 2 and the drill rod 1;

[0039] A gas collection box 10 and a recovery pipeline, wherein the gas collection box 10 is connected to the drill pipe casing 2 through the recovery pipeline, so that the shallow gas in the drill pipe casing 2 can flow into the gas collection box 10;

[0040] The sealing component 3 has a base plate 3.1 fixedly connected to the top of the drill pipe casing 2, and a pair of sealing covers 3.4 relatively rotatably connected to the upper side of the base plate 3.1 and can be opened and closed. The two sealing covers 3.4 have the same structure and are arranged symmetrically with respect to the drill pipe 1. The base plate 3.1 is a circular metal plate with a certain thickness, which is the basis of the entire sealing component 3 and provides support and stability. In order to facilitate tight connection, the base plate 3.1 is integrally connected with a joint 3.2, which is penetrated from top to bottom so that the drill pipe 1 can pass through it movably. The base plate 3.1 is fixedly connected to the top of the drill pipe casing 2 through the joint 3.2. When collecting shallow gas, the two sealing covers 3.4 are closed to seal the top of the drill pipe casing 2. The base plate 3.1 has a through hole for accommodating the drill pipe 1 to pass through;

[0041] The jacking component 5 and the reaction component 6, the jacking component 5 is configured as a telescopic component up and down, and can be a small jack or other telescopic components, the reaction component 6 is fixedly connected to the drill pipe casing 2, the jacking component 5 is fixedly connected to the reaction component 6 and uses the reaction component 6 as the reaction force support basis, the jacking component 5 is configured as a telescopic structure up and down, the jacking component 5 is directly above the two sealing covers 3.4, and when the sealing covers 3.4 are closed, the jacking component 5 extends downward and forces the two sealing covers 3.4 to be in a closed state.

[0042] The sealing cover 3.4 is elastically rotatably connected to the upper side of the base plate 3.1, and when in the open state, the sealing cover 3.4 is tilted upward based on its rotation connection point, which is equivalent to being in a semi-open state (such as Figure 3 , 4 shown).

[0043] like Figure 3-6 As shown, as a rotation connection scheme of the sealing cover 3.4, the sealing cover 3.4 is equipped with a connecting piece 3.3 and a torsion spring 3.6. The connecting piece 3.3 is fixedly connected to the base plate 3.1, and the sealing cover 3.4 is elastically rotatably connected to the connecting piece 3.3 through the torsion spring 3.6. The torsion spring 3.6 is the basis for the elastic rotation connection of the sealing cover 3.4. When the sealing cover 3.4 is not under pressure, the torsion spring 3.6 drives the sealing cover 3.4 to tilt upward, so that the sealing cover 3.4 is in a semi-open state. When closing the sealing cover 3.4, the lifting component 5 needs to overcome the elastic force of the torsion spring 3.6 to drive the sealing cover 3.4 to rotate downward to the closed position (combined with the sealing cover 3.4). Figure 4 , 6 shown).

[0044] like Figure 7As shown, in order to facilitate the control of the opening and closing state of the sealing cover 3.4, the device also includes a sensor control component 4, which includes a gas sensor 4.1 installed on the inner side of the drill pipe casing 2 and an independently arranged controller 4.3. The controller 4.3 is connected to the connection terminal of the jacking component 5 through the sheath wire 4.2, so that the jacking component 5 and the controller 4.3 form an electric control relationship. Similarly, the gas sensor 4.1 is connected to the controller 4.3 through the sheath wire 4.2, so that the gas sensor 4.1 and the controller 4.3 form an electric control relationship; the gas sensor 4.1 is used to detect the shallow gas concentration and transmit the sensing information to the controller 4.3, and display the detection information (such as the shallow gas concentration) on the display screen of the controller 4.3. If the shallow gas concentration exceeds the threshold, the jacking component 5 is in motion under the drive of the controller 4.3.

[0045] As an optimization solution for the sealing cover 3.4, the opposite sides of the two sealing covers 3.4 are provided with semicircular notches. In the closed state, the semicircular notches of the two sealing covers 3.4 are combined into a circular hole structure that matches the cross-sectional circle of the drill rod 1. Figure 5 shown.

[0046] The opposite sides of the sealing cover 3.4 and the semicircular notch thereof, as well as the lower surface of the sealing cover 3.4, are all attached with airtight gaskets 3.5. When closed, the airtight gaskets 3.5 seal the gap between the two sealing covers 3.4, the gap between the semicircular notch of the sealing cover 3.4 and the drill pipe 1, and the gap between the sealing cover 3.4 and the base plate 3.1. Therefore, when the two sealing covers 3.4 are in a closed state, they are in an all-round sealing state to prevent shallow gas from leaking from the top of the drill pipe casing 2.

[0047] The lifting component 5 and its downward pressure point are staggered with the semicircular notch of the sealing cover 3.4. The number of the lifting component 5 may be one or two.

[0048] like Figure 6 , 7 As shown, there are two lifting components 5, the semicircular notch of the sealing cover 3.4 is located in the center of the opposite side of the sealing cover 3.4, and the two lifting components 5 are located on both sides of the drill pipe 1, so that the sealing cover 3.4 is compressed on both sides to better perform the closing operation.

[0049] like Figure 8 As shown, the reaction component 6 includes a reaction frame 6.1 and at least two support rods 6.2, and also includes two force transmission bases 6.3. The two force transmission bases 6.3 respectively constitute the bottom of the two jacking components 5 (fixed connection relationship), and the top of the jacking component 5 is connected to the reaction frame 6.1. The reaction frame 6.1 is fixedly connected to the outer wall of the drill pipe casing 2 through the support rods 6.2. A gap is provided in the center of the reaction frame 6.1 to allow the drill pipe 1 to move through.

[0050] like Figure 2 As shown, the recovery pipeline of the above-mentioned gas collection box 10 includes an air guide pipe 7 and an air guide hose 8. One end of the air guide pipe 7 is connected to the drill pipe casing 2, and the other end of the air guide pipe 7 is connected to one end of the air guide hose 8. The other end of the air guide hose 8 is connected to the gas collection box 10. A barometer 9 for detecting shallow gas pressure is installed on the air guide hose 8.

[0051] See also Figure 1-8 As shown, based on the above device, a shallow gas automatic detection method is proposed, comprising the following steps:

[0052] S1, fix the air guide tube 7 to the outside of the drill pipe casing 2 and connect it to the drill pipe casing 2, and tightly install the sealing component 3 on the top of the drill pipe casing 2;

[0053] S2, fix the gas sensor 4.1 on the inner side of the drill pipe casing 2, assemble the sensor control component 4, and perform wiring operations;

[0054] S3, the support rod 6.2 of the reaction component 6 is fixedly connected to the drill pipe casing 2, and the top of the jacking component 5 is connected to the reaction frame 6.1 of the reaction component 6;

[0055] S4, connecting the gas collection box 10 and the drill pipe casing 2 with a recovery pipeline, that is, connecting the gas hose 8 to the gas pipe 7, the barometer 9 and the gas collection box 10 in sequence;

[0056] S5, passing the drill rod 1 through the reaction frame 6.1 of the reaction component 6 and the sealing component 3, so as to place it inside the drill rod casing 2;

[0057] S6, adjust the lifting component 5 so that the force transmission base 6.3 of the lifting component 5 is in contact with the two sealing covers 3.4 in the semi-open state, and use the sheathed wire 4.2 to electrically connect the lifting component 5 and the controller 4.3;

[0058] S7, the drilling rig is engaged in drilling construction, and the sealing cover 3.4 in the sealing component 3 is kept in an open state;

[0059] S8, when the drill pipe 1 and the drill pipe casing 2 reveal the shallow gas-bearing stratum, the gas enters the drill pipe casing 2. When the shallow gas concentration in the drill pipe casing 2 exceeds the threshold, the sensor control component 4 is activated, and the lifting component 5 is started. The lifting component 5 presses down and closes the sealing cover 3.4 to perform an airtight seal on the top of the drill pipe casing 2, so that the shallow gas in the drill pipe casing 2 can only enter the gas collection box 7 through the recovery pipeline;

[0060] S9. Perform air pressure measurement and gas collection.

[0061] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention; in the present invention, it should also be noted that the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integrally formed connection, a mechanical connection, or an indirect connection through an intermediate connecting component, and the specific meaning of the terms in this utility model can be understood according to the specific circumstances.

[0062] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0063] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An automatic shallow gas detection device based on engineering exploration drilling equipment, comprising a drill pipe (1) and a drill pipe casing (2) for casing the drill pipe (1), characterized in that: Also includes: A gas collection box (10) and a recovery pipeline, wherein the gas collection box (10) is connected to the drill pipe casing (2) through the recovery pipeline so that the shallow gas in the drill pipe casing (2) can flow into the gas collection box (10); A sealing component (3) comprising a base plate (3.1) fixedly connected to the top of a drill pipe casing (2), and a pair of sealing covers (3.4) connected to the upper side of the base plate (3.1) in a relatively rotatable manner and capable of being opened and closed. When collecting shallow gas, the two sealing covers (3.4) are closed to seal the top of the drill pipe casing (2). The base plate (3.1) has a through hole for accommodating the drill pipe (1) to pass through. A lifting component (5) and a reaction component (6), wherein the reaction component (6) is fixedly connected to the drill pipe casing (2), the lifting component (5) is fixedly connected to the reaction component (6) and uses the reaction component (6) as a reaction force support basis, the lifting component (5) is configured as a structure that can be extended up and down, the lifting component (5) is located directly above the two sealing covers (3.4), and when the sealing covers (3.4) are closed, the lifting component (5) extends downward and forces the two sealing covers (3.4) to be in a closed state.

2. According to claim 1, an automatic shallow gas detection device based on engineering survey drilling equipment is characterized in that: The sealing cover (3.4) is elastically rotatably connected to the upper side of the base plate (3.1), and in an open state, the sealing cover (3.4) tilts upward based on its rotation connection point.

3. According to claim 1, an automatic shallow gas detection device based on engineering survey drilling equipment is characterized in that: The invention also comprises a sensing control component (4), wherein the sensing control component (4) comprises a gas sensor (4.1) installed inside the drill pipe casing (2) and an independently arranged controller (4.3), wherein the gas sensor (4.1) is used to detect the shallow gas concentration and transmit the sensing information to the controller (4.3); if the shallow gas concentration exceeds a threshold value, the lifting component (5) is driven by the controller (4.3) to be in motion.

4. The shallow gas automatic detection device based on engineering survey drilling equipment according to claim 1 is characterized in that: Semicircular notches are provided on opposite sides of the two sealing covers (3.4), and in a closed state, the semicircular notches of the two sealing covers (3.4) are combined into a circular hole structure that matches the cross-sectional circle of the drill rod (1).

5. The automatic shallow gas detection device based on engineering survey drilling equipment according to claim 4 is characterized in that: The opposite sides of the sealing cover (3.4) and its semicircular notch, as well as the lower surface of the sealing cover (3.4), are all attached with airtight gaskets (3.5). When closed, the airtight gaskets (3.5) seal the gap between the two sealing covers (3.4), the gap between the semicircular notch of the sealing cover (3.4) and the drill rod (1), and the gap between the sealing cover (3.4) and the base plate (3.1).

6. The automatic shallow gas detection device based on engineering survey drilling equipment according to claim 4 is characterized in that: The downward pressure point of the lifting component (5) is staggered from the semicircular notch of the sealing cover (3.4), and the lifting component (5) is provided with one or two.

7. The automatic shallow gas detection device based on engineering survey drilling equipment according to claim 6 is characterized in that: Two lifting components (5) are provided, the semicircular notch of the sealing cover (3.4) is located at the center of the opposite side edges of the sealing cover (3.4), and the two lifting components (5) are located at both sides of the drill rod (1).

8. The automatic shallow gas detection device based on engineering survey drilling equipment according to claim 7 is characterized in that: The reaction force component (6) comprises a reaction force frame (6.1) and at least two support rods (6.2), and also comprises two force transmission bases (6.3), the two force transmission bases (6.3) respectively forming the bottoms of two lifting components (5), the tops of the lifting components (5) are connected to the reaction force frame (6.1), the reaction force frame (6.1) is fixedly connected to the outer wall of the drill pipe casing (2) through the support rods (6.2), and the reaction force frame (6.1) is provided with a gap for accommodating the drill pipe (1) to movably pass through.

9. The automatic shallow gas detection device based on engineering survey drilling equipment according to any one of claims 1 to 8, characterized in that: The recovery pipeline of the gas collection box (10) comprises an air guide pipe (7) and an air guide hose (8); one end of the air guide pipe (7) is connected to the drill pipe casing (2); the other end of the air guide pipe (7) is connected to one end of the air guide hose (8); the other end of the air guide hose (8) is connected to the gas collection box (10); and a barometer (9) for detecting shallow gas pressure is installed on the air guide hose (8).

10. A detection method based on the shallow gas automatic detection device based on engineering survey drilling equipment according to claim 3, characterized in that: The steps include: The drilling rig is engaged in drilling construction, and the sealing cover (3.4) in the sealing component (3) is kept in an open state; When the drill pipe (1) and the drill pipe casing (2) expose a shallow gas-bearing stratum, gas enters the drill pipe casing (2). When the shallow gas concentration in the drill pipe casing (2) exceeds a threshold value, the sensor control component (4) is activated, and the lifting component (5) is started. The lifting component (5) presses down and closes the sealing cover (3.4), thereby air-sealing the top of the drill pipe casing (2), so that the shallow gas in the drill pipe casing (2) can only enter the gas collection box (7) through the recovery pipeline. Perform air pressure measurement and gas collection.

Images