Shallow gas detection device based on engineering investigation drilling equipment

Abstract

The utility model discloses a shallow gas detection device based on engineering investigation drilling equipment, which aims to overcome the limitation of the prior art in the aspects of shallow gas detection and collection, and integrates a drill rod, a drill rod sleeve, a sealing part, a gas guide pipe, a gas guide hose, a barometer, a gas collection box and the like. Once shallow gas escapes from the top of the drill pipe sleeve in the drilling process, the two sealing covers are driven to move relatively to close the sealing covers and seal the top of the drill pipe sleeve, the gas is guided to the gas guide pipe and the gas guide hose and then enters the barometer and the gas collection box, and gas pressure measurement and gas collection are achieved. By adopting the shallow gas detection equipment and technology, the shallow gas can be simply, conveniently and efficiently detected and collected without additionally judging a stratum to be detected or newly adding construction equipment, and the overall efficiency of construction is greatly improved. And a more accurate and efficient shallow gas detection and collection solution is provided for the field of engineering investigation.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering survey technical field, concretely is a shallow gas detection device based on engineering survey drilling equipment. BACKGROUND

[0002] The underground space development in China is developing rapidly, and projects such as rail transit tunnels, building basements, and underground municipal facilities have been developed and applied on a large scale. According to existing experience, during the construction process of engineering survey and foundation pit excavation in coastal areas, underground shallow gas dominated by marsh gas is often found. If reasonable engineering measures are not taken, shallow gas is prone to form sudden gushing, sand flow and other dangerous situations during the construction or operation stage; at the same time, marsh gas is toxic and flammable, and can cause poisoning or explosion accidents when reaching a certain concentration, which seriously threatens the safety of on-site personnel and has considerable construction risks.

[0003] In the past, due to the limitations of technical means, the work of engineering survey stage often does not include gas detection in soil layer. In recent years, with the needs of engineering construction, people have developed static sounding probes integrating gas detection, gas pressure measurement, and gas storage functions to achieve efficient detection of shallow gas during the engineering survey stage (patents with authorization announcement numbers CN211122858U and CN218382328U). However, due to the characteristics of difficult water-based static sounding, low cost performance, and easy breaking of the probe rod, the above type of technical equipment is generally only suitable for shallow gas detection in land-based survey.

[0004] Currently, there are still limited shallow gas detection technologies available for water-based engineering survey stage. Patent CN110656926A discloses a shallow gas detection device based on drilling equipment. This technology requires first drilling to the depth of marsh gas occurrence and then knocking in the shallow gas detection equipment for marsh gas collection. Due to the differences and variability of actual strata, the actual occurrence depth of shallow gas cannot be accurately determined during survey construction, which is complicated and inefficient in actual construction, and may lead to inaccurate test results due to marsh gas leakage. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a shallow gas detection device based on engineering survey drilling equipment, aiming to overcome the limitations of existing technologies in shallow gas detection and collection.

[0006] The utility model is achieved as follows: a shallow gas detection device based on engineering survey drilling equipment, including a drill rod and a drill rod sleeve set on the drill rod, further including:

[0007] The sealing part comprises a base plate fixedly connected to the top of the drill pipe casing, and a pair of openable and closable sealing covers oppositely and slidably arranged on the upper side of the base plate, the base plate is provided with a hole through which the drill pipe is relatively movably arranged, and the sealing covers are closed and sealed to the top of the drill pipe casing when shallow gas is recovered.

[0008] The gas collection box and the gas recovery pipeline thereof are connected with the drill pipe casing through the gas recovery pipeline.

[0009] Further, opposite side edges of the two sealing covers are provided with semicircular grooves, and the semicircular grooves of the two sealing covers are combined into a circular hole for accommodating the drill pipe when the sealing covers are closed.

[0010] Further, the base plate is fixedly connected with a sliding rail, and the sealing covers are movably connected with the sliding rail.

[0011] Further, the lower side of the sealing cover is rotatably connected with a plurality of rollers which are rollingly connected with the sliding rail.

[0012] Further, the opposite side edges, the semicircular grooves and the lower side of the sealing cover are attached with air-tight pads, and the air-tight pads seal the joint of the two sealing covers, the gap between the semicircular grooves of the sealing covers and the drill pipe, and the gap between the two sealing covers and the upper side of the base plate when the sealing covers are closed.

[0013] Further, the drill pipe is integrally connected with a driving drill pipe body and a drilling drill pipe body, the cross-sectional circular diameter of the driving drill pipe body is larger than that of the drilling drill pipe body and the diameter of the circular hole combined by the semicircular grooves of the two sealing covers, the driving drill pipe body is located at the top of the drilling drill pipe body, and the driving drill pipe body presses the two sealing covers downward and covers the circular hole combined by the semicircular grooves of the two sealing covers when the sealing covers are closed.

[0014] Further, the lower side of the base plate is integrally connected with a connector, the base plate is fixedly connected to the top of the drill pipe casing through the connector, the connector is provided as a hollow structure penetrating from top to bottom, and the drill pipe movably penetrates the connector.

[0015] Further, the gas recovery pipeline comprises a gas guide pipe and a gas guide hose, the gas guide pipe is fixedly connected and communicated with the drill pipe casing, the two ends of the gas guide hose are connected with the gas guide pipe and the gas collection box respectively, and the gas guide hose is provided with a gas pressure gauge for detecting the pressure of the shallow gas.

[0016] The utility model discloses beneficial effect lies in:

[0017] 1, adopt prefabricated equipment, on -the -spot installation simple and quick, has improved the convenience and efficiency of construction;

[0018] 2. Without judging the shallow gas bearing stratum in advance, the shallow gas detection and collection can be realized while drilling, the complexity of construction is simplified, once the shallow gas escapes from the top of the drill pipe casing during drilling, the two sealing covers are relatively moved to close the sealing cover, the top of the drill pipe casing is sealed, the gas will be guided to the gas guide pipe and the gas guide hose, and then enters the gas pressure gauge and the gas collection box, realizing the gas pressure measurement and gas collection;

[0019] 3. The problem of poor applicability of the existing shallow gas detection device developed based on static detection equipment in water area survey construction is solved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the system arrangement drawing of the utility model.

[0021] Figure 2 is the schematic view of the sealing cover in the opening state.

[0022] Figure 3 is Figure 2 the A-A sectional view in the figure.

[0023] Figure 4 is the schematic view of the sealing cover in the closing state.

[0024] Figure 5 is Figure 4 the B-B sectional view in the figure.

[0025] BRIEF DESCRIPTION OF DRAWINGS: 1-drill pipe, 1.1-active drill pipe body, 1.2-drilling drill pipe body; 2-drill pipe casing; 3-sealing part, 3.1-base plate, 3.2-joint, 3.3-slideway, 3.4-roller, 3.5-sealing cover, 3.6-air-tight pad; 4-gas guide pipe; 5-gas guide hose; 6-gas pressure gauge; 7-gas collection box. DETAILED DESCRIPTION

[0026] The technical scheme in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0027] As shown in Figure 1 , a shallow gas detection device based on engineering survey drilling equipment is proposed, comprising:

[0028] a drill pipe 1;

[0029] a drill pipe casing 2 sleeved with the drill pipe 1;

[0030] The sealing component 3 comprises a base plate 3.1 fixedly connected to the top of the drill pipe casing 2, and a pair of openable and closable sealing covers 3.5 slidably disposed horizontally above the base plate 3.1. When recovering shallow gas, the sealing covers 3.5 close and seal the top of the drill pipe casing 2. The base plate 3.1 serves as the foundation of the entire sealing component 3, providing support and stability. A circular hole matching the diameter of the drill pipe body 1.2 is provided in its center for the relatively movable passage of the drill pipe body 1.2.

[0031] The gas collection box 7 and its gas recovery pipeline are connected to the drill pipe casing 2 through the gas recovery pipeline.

[0032] The two sealing covers 3.5 have semicircular grooves in the centers of their opposing sides. When the sealing covers 3.5 are closed, the semicircular grooves combine to form a circular hole that accommodates the drill rod 1 and provides a movably sealed fit with the drill rod 1. The two sealing covers 3.5 are two semicircular cover plates of the same size, slightly larger than the base plate 3.1, and can be opened and closed by sliding.

[0033] like Figures 2-5 As shown, the base plate 3.1 is fixedly connected to a horizontally extending slide rail 3.3, with which the sealing cover 3.5 movably engages. To reduce resistance during the movement of the sealing cover 3.5, a plurality of rollers 3.4 are rotatably connected to the underside of the sealing cover 3.5, which roll in engagement with the slide rail 3.3. There are two slide rails 3.3, and two rows of rollers 3.4 are rotatably connected to the underside of the sealing cover 3.5. These two rows of rollers 3.4 roll in engagement with the two slide rails 3.3, thereby smoothly guiding the sealing cover 3.5 in opening and closing.

[0034] Airtight gaskets 3.6 are attached to the opposite sides, semicircular grooves and lower sides of the above-mentioned sealing covers 3.5. When the sealing covers 3.5 are closed, the airtight gaskets 3.6 seal the joints between the two sealing covers 3.5, the gap between the semicircular grooves of the sealing covers 3.5 and the drill rod 1, and the gap between the two sealing covers 3.5 and the upper side of the base plate 3.1, thereby ensuring the airtight effect of the sealing component 3 in the closed state.

[0035] The drill rod 1 is formed by an active drill rod body 1.1 and a drilling drill rod body 1.2 connected as one body. The cross-sectional diameter of the active drill rod body 1.1 is larger than the cross-sectional diameter of the drilling drill rod body 1.2, and larger than the diameter of the circular hole formed by the semicircular grooves of the two sealing covers 3.5. The active drill rod body 1.1 is located at the top of the drilling drill rod body 1.2. When the sealing covers 3.5 are closed, the active drill rod body 1.1 presses the two sealing covers 3.5 downwardly and covers the circular hole formed by the semicircular grooves of the two sealing covers 3.5, further ensuring the sealing effect. The radius of the semicircular groove of the sealing cover 3.5 matches the cross-sectional radius of the drilling drill rod body 1.2. The radius of the semicircular groove of the sealing cover 3.5 is consistent with the radius of the circular hole on the base plate 3.1. When closed, the semicircular groove of the sealing cover 3.5 is coaxial with the circular hole on the base plate 3.1 to accommodate the smooth passage of the drilling drill rod body 1.2.

[0036] In order to make the position of the base plate 3.1 more stable, a joint 3.2 is integrally connected to the lower side of the base plate 3.1. The base plate 3.1 is fixedly connected to the top of the drill pipe casing 2 through the joint 3.2. The joint 3.2 is a hollow structure that passes through from top to bottom, and the drill pipe 1 movably passes through the joint 3.2.

[0037] The above-mentioned gas recovery pipeline includes an air pipe 4 and an air hose 5. The air pipe 4 is fixedly connected to and communicates with the drill pipe casing 2. The two ends of the air hose 5 are respectively connected to the air pipe 4 and the gas collection box 7. The air hose 5 is provided with a barometer 6 for detecting shallow gas pressure.

[0038] Based on the above device, a construction method is proposed, which includes the following steps:

[0039] S1. Install the air guide tube 4 on the outside of the drill pipe casing 2 and tightly install the sealing component 3 on the top of the drill pipe casing 2;

[0040] S2. Connect the air guide hose 5 to the air guide tube 4, the barometer 6 and the gas collection box 7 in sequence;

[0041] S3, pass the drilling rod body 1.2 through the sealing component 3 and place it inside the drill rod casing 2;

[0042] S4 drilling rig construction, keep the sealing member 3 in the sealing cover 3.5 is in the open state;

[0043] S5. When drilling through the drill pipe body 1.2 and the drill pipe casing 2 reveals a shallow gas-bearing formation, gas escapes from the sealing member 3. The sliding roller 3.4 closes the sealing cap 3.6, pressing down on the active drill pipe body 1.1 to tighten it. This allows the shallow gas in the drill pipe casing 2 to enter the barometer 6 and gas collection box 7 only through the gas guide tube 4.

[0044] S6. The gas pressure is measured by using the barometer 6, and the shallow gas is guided into the gas collection box 7 through the gas guide pipe 4 and the gas guide hose 5.

[0045] The embodiment has the following advantages:

[0046] 1. The prefabricated equipment is simple and fast to install on site, improving the convenience and efficiency of construction.

[0047] 2. The shallow gas can be detected and collected while drilling without prior judgment of the shallow gas bearing stratum, simplifying the complexity of construction.

[0048] 3. The problem of poor applicability of the existing shallow gas detection device based on static exploration equipment in water exploration construction is solved.

[0049] In the description of the utility model, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model; In the utility model, it should be explained that the terms "mounting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, or it can be mechanically connected, or it can be indirectly connected through an intermediate connecting part, and the specific meaning of the terms in the utility model can be understood according to the specific circumstances.

[0050] For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model, and any reference signs in the claims should not be regarded as limiting the involved claims.

[0051] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A shallow gas detection device based on engineering exploration drilling equipment, comprising a drill pipe (1) and a drill pipe casing (2) for sleeved drill pipe (1), characterized in that: Also includes: 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 (3.5) relatively slidably arranged on the upper side of the base plate (3.1) and capable of opening and closing. The base plate (3.1) is provided with a hole for the drill pipe (1) to relatively movably pass through. When recovering shallow gas, the sealing covers (3.5) close and seal the top of the drill pipe casing (2); A gas collection box (7) and a gas recovery pipeline thereof; the gas collection box (7) is connected to the drill pipe casing (2) via the gas recovery pipeline.

2. The shallow gas detection device based on engineering survey drilling equipment according to claim 1 is characterized in that: Semicircular grooves are provided on opposite sides of the two sealing covers (3.5). When the sealing covers (3.5) are closed, the semicircular grooves of the two sealing covers (3.5) are combined into a circular hole that accommodates the drill rod (1) passing through and is movably sealed with the drill rod (1).

3. The shallow gas detection device based on engineering exploration drilling equipment according to claim 1 is characterized in that: The base plate (3.1) is fixedly connected to a slide rail (3.3), and the sealing cover (3.5) is movably matched with the slide rail (3.3).

4. The shallow gas detection device based on engineering survey drilling equipment according to claim 3 is characterized in that: The lower side of the sealing cover (3.5) is rotatably connected to a plurality of rollers (3.4) that roll in cooperation with the slide rail (3.3).

5. The shallow gas detection device based on engineering survey drilling equipment according to claim 2 is characterized in that: Airtight gaskets (3.6) are attached to the opposite sides, semicircular grooves and lower sides of the sealing covers (3.5). When the sealing covers (3.5) are closed, the airtight gaskets (3.6) seal the joints between the two sealing covers (3.5), the gap between the semicircular grooves of the sealing covers (3.5) and the drill rod (1), and the gap between the two sealing covers (3.5) and the upper side of the base plate (3.1).

6. The shallow gas detection device based on engineering survey drilling equipment according to claim 2 is characterized in that: The drill rod (1) is formed by an active drill rod body (1.1) and a drilling drill rod body (1.2) connected in one piece. The cross-sectional diameter of the active drill rod body (1.1) is larger than the cross-sectional diameter of the drilling drill rod body (1.2) and larger than the diameter of a circular hole formed by combining the semicircular grooves of two sealing covers (3.5). The active drill rod body (1.1) is located at the top of the drilling drill rod body (1.2). When the sealing cover (3.5) is closed, the active drill rod body (1.1) presses the two sealing covers (3.5) downwards and covers the circular hole formed by combining the semicircular grooves of the two sealing covers (3.5).

7. The shallow gas detection device based on engineering survey drilling equipment according to claim 1 is characterized in that: A joint (3.2) is integrally connected to the lower side of the base plate (3.1); the base plate (3.1) is fixedly connected to the top of the drill rod casing (2) via the joint (3.2); the joint (3.2) is configured as a hollow structure that passes through from top to bottom; the drill rod (1) movably passes through the joint (3.2).

8. A shallow gas detection device based on engineering survey drilling equipment according to any one of claims 1 to 7, characterized in that: The gas recovery pipeline comprises an air guide pipe (4) and an air guide hose (5); the air guide pipe (4) is fixedly connected to and communicates with the drill pipe casing (2); the two ends of the air guide hose (5) are respectively connected to the air guide pipe (4) and a gas collection box (7); and the air guide hose (5) is provided with a barometer (6) for detecting shallow gas pressure.

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