Ground penetrating radar antenna device for tunnel face

Abstract

The utility model relates to the technical field of advance geological forecast of tunnels and underground engineering, and provides a ground penetrating radar antenna device for a tunnel face, which comprises an antenna and a coupling structure, the antenna is provided with a first side surface, and the orientation of the first side surface is consistent with the orientation of a signal transmitting end of the antenna; the coupling structure is arranged on the first side face, is a flexible structure, can deform along with a concave-convex working face on a tunnel face and is tightly attached to the concave-convex working face. The ground penetrating radar antenna device can be well coupled with a tunnel face, so that it is ensured that electromagnetic wave signals can be well transmitted to a rock mass in front of the tunnel face, and the situation that data interpretation is affected due to the fact that the event of the electromagnetic wave signals is discontinuous due to the uneven tunnel face is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to tunnel and underground engineering advanced geological prediction technical field especially relates to a ground penetrating radar antenna device for tunnel face. BACKGROUND

[0002] In the tunnel and underground engineering excavation process, due to the complexity of geological conditions, often will meet sudden mud gushing, collapse and other adverse geological problems. Therefore it is very necessary to prove the distribution of adverse geological body in advance through advanced geological prediction, effectively guide tunnel safety construction excavation. Ground penetrating radar technology is a kind of geophysical detection technology based on high-frequency electromagnetic wave reflection, is widely applied to tunnel advanced geological prediction. Electromagnetic wave propagates in the rock, when abnormal such as lithology interface, karst cave is met, reflection will be produced, through the analysis of the reflected electromagnetic wave signal, adverse geological body can be accurately identified and positioned.

[0003] Ground penetrating radar system is generally composed of host computer, cable and antenna, wherein the antenna is used for transmitting and receiving electromagnetic wave signal. In the tunnel advanced geological prediction data acquisition process, in order to electromagnetic wave signal can better propagate to the rock mass in front of the face, and avoid the discontinuity of electromagnetic wave signal caused by the uneven face and affect data interpretation, the antenna needs to be close to the face, makes the antenna and the face good coupling.

[0004] However, due to the objective reason of blasting excavation, the tunnel face is often very uneven, and the rock mass is uneven, which greatly affects the coupling of ground penetrating radar antenna and face. Therefore, an antenna device for ground penetrating radar of tunnel face is needed to realize the good coupling of ground penetrating radar antenna and tunnel face and improve the quality of field data acquisition. UTILITY MODEL CONTENTS

[0005] The utility model provides a ground penetrating radar antenna device for tunnel face to solve the problem of the uneven tunnel face affecting the coupling of ground penetrating radar antenna and face in the prior art.

[0006] The utility model provides a ground penetrating radar antenna device for tunnel face, comprising:

[0007] The antenna has a first side, and the direction of the first side is consistent with the direction of the signal transmitting end of the antenna.

[0008] The coupling structure is arranged on the first side, and the coupling structure is a flexible structure that can deform with the uneven working surface on the face and tightly fit the uneven working surface.

[0009] According to the ground penetrating radar antenna device for tunnel face provided by the utility model, the coupling structure comprises:

[0010] A flexible bag for containing a filler, the filler being movable within the flexible bag under the action of a squeezing force.

[0011] According to the utility model provides a kind of for tunnel face ground penetrating radar antenna device, the flexible bag is rubber bag, and / or, the filler is sand.

[0012] According to the utility model provides a kind of for tunnel face ground penetrating radar antenna device, the quantity of the flexible bag is multiple, the flexible bag is along first direction extension arrangement, multiple the flexible bag is along second direction arrangement, the first direction and the second direction are angle arrangement.

[0013] According to the utility model provides a kind of for tunnel face ground penetrating radar antenna device, the flexible bag is semicylindrical.

[0014] According to the utility model provides a kind of for tunnel face ground penetrating radar antenna device, the flexible bag is equipped with opening in one end in the first direction, the opening is equipped with cover, the cover is used to open and close the opening.

[0015] According to the utility model provides a kind of for tunnel face ground penetrating radar antenna device, further include:

[0016] Base plate, the base plate can be detachably installed on the first side, the flexible bag is fixed on the side of the base plate away from the first side.

[0017] According to the utility model provides a kind of for tunnel face ground penetrating radar antenna device, further include:

[0018] Level meter, the antenna also has second side, the second side is vertically arranged with the first side, and the level meter is installed on the second side.

[0019] According to the utility model provides a kind of for tunnel face ground penetrating radar antenna device, further include:

[0020] Laser unit, both sides of the level meter are respectively equipped with the laser unit, for respectively emitting infrared laser towards the sidewall of both sides of tunnel.

[0021] According to the utility model provides a kind of for tunnel face ground penetrating radar antenna device, the side of the antenna away from the first side is fixed with handle.

[0022] The ground penetrating radar antenna device for a tunnel face provided by the utility model, through setting the antenna in the antenna, setting the flexible coupling structure on the first side surface corresponding to the signal transmitting end of the antenna on the antenna, filling the air gap between the first side surface and the concave-convex operation surface by the deformation characteristics of the coupling structure, making the ground penetrating radar antenna device and the concave-convex operation surface closely adhere, realizing the good coupling of the ground penetrating radar antenna device and the face, thereby guaranteeing that the electromagnetic wave signal can be better propagated into the rock mass in front of the face, and avoiding the discontinuity of the electromagnetic wave signal in-phase axis caused by the uneven face from affecting data interpretation. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0024] Figure 1 It is the coupling structure of the ground penetrating radar antenna device for a tunnel face provided by the utility model in the opening state schematic view.

[0025] Figure 2 It is the coupling structure of the ground penetrating radar antenna device for a tunnel face provided by the utility model in the closing state schematic view.

[0026] Figure 3 It is one of the front views of the ground penetrating radar antenna device for a tunnel face provided by the utility model.

[0027] Figure 4 It is the second front view of the ground penetrating radar antenna device for a tunnel face provided by the utility model.

[0028] Figure 5 It is the working schematic view of the ground penetrating radar antenna device for a tunnel face provided by the utility model applied to the tunnel face.

[0029] Figure 6 It is the detection data without the ground penetrating radar antenna device for a tunnel face provided by the utility model.

[0030] Figure 7 It is the detection data of the ground penetrating radar antenna device for a tunnel face provided by the utility model.

[0031] 1, antenna; 11, first side; 12, second side; 13, third side; 2, coupling structure; 21, flexible bag; 22, filler; 23, cover; 31, level; 32, laser unit; 33, housing; 4, handle; 51, tunnel; 52, sidewall; 6, auxiliary mark. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "first", "second", "third" are numbered for the purpose of clearly describing the product components, and do not represent any substantial difference. The terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances. In addition, the meaning of "multiple" is two or more than two.

[0034] The following will be described in combination with Figures 1-7 The ground penetrating radar antenna device for tunnel face of the present application is described.

[0035] As Figure 1 and Figure 2 shown, the ground penetrating radar antenna device for tunnel face provided by the embodiments of the present application comprises an antenna 1 and a coupling structure 2. The antenna 1 has a first side 11, and the orientation of the first side 11 is consistent with the orientation of the signal transmitting end of the antenna. The coupling structure 2 is arranged on the first side 11, and the coupling structure 2 is a flexible structure which can be deformed with the concave-convex working surface on the tunnel face and tightly fit with the concave-convex working surface.

[0036] It can be understood that the first side 11 is one outer side of the antenna 1, which is usually a plane. The orientation of the signal transmitting end of the antenna is consistent with the orientation of the first side 11, so as to adjust the direction of electromagnetic wave signal transmission by adjusting the attitude of the first side 11. For example, when the first side 11 is in a vertical state, the electromagnetic wave signal of the antenna propagates in a horizontal direction.

[0037] In use, the first side 11 faces the rock mass in front of the tunnel face, and the antenna 1 emits radar wave electromagnetic signals towards the rock mass in front of the tunnel face. The ground penetrating radar antenna device is pressed towards the concave-convex working surface of the tunnel face by an external force, the coupling structure 2 is pressed between the working surface and the antenna 1, and the flexible coupling structure 2 can change the shape under the action of the external force to fill the air gap between the first side 11 and the concave-convex working surface.

[0038] The ground penetrating radar antenna device for the tunnel face provided in the embodiment of the utility model fills the air gap between the first side 11 and the concave-convex working surface by the deformation characteristics of the coupling structure 2, makes the ground penetrating radar antenna device closely adhere to the concave-convex working surface, realizes good coupling between the ground penetrating radar antenna device and the tunnel face, thereby ensuring that the electromagnetic wave signals can be well transmitted into the rock mass in front of the tunnel face, and avoiding the discontinuity of the electromagnetic wave signals caused by the uneven tunnel face from affecting data interpretation.

[0039] In the embodiment of the utility model, the coupling structure can be made of flexible materials as a whole, such as rubber materials or silica gel materials.

[0040] The filling material 22 has fluidity, such as the filling material 22 being sand or fine sand. The filling material 22 can also be other fine particle materials or water that are convenient to accommodate in the flexible bag 21. Under the action of the external force, the filling material 22 is extruded to the recessed area of the working surface by the protruding part of the working surface, thereby filling the recessed area of the working surface, and achieving the filling effect.

[0041] Optionally, the flexible bag 21 is a rubber bag. The rubber has strong plasticity and good wear resistance, which can improve the service life of the coupling structure 2. In a specific embodiment, the flexible bag 21 is a rubber bag, and the filling material 22 is sand.

[0042] In the embodiment of the utility model, the number of flexible bags 21 is multiple, the flexible bags 21 are arranged in the first direction, and the multiple flexible bags 21 are arranged in the second direction. The first direction and the second direction are arranged at an angle.

[0043] Optionally, the first direction and the second direction are perpendicular. The first side 11 is a rectangular surface, the first direction is the width direction of the first side 11, and the second direction is the length direction of the first side 11. In this way, the shape and size of each flexible bag 21 are the same, and the multiple flexible bags 21 cover the first side 11.

[0044] The embodiment divides the filling material 22 into multiple flexible bags 21, and forms multiple accommodating spaces arranged in the first direction on the first side face 11. In actual use, the filling material in each flexible bag 21 is limited to flow in the first direction, so that the uneven working surface can be filled more quickly and effectively.

[0045] Specifically, the flexible bag 21 is a cylindrical bag structure arranged in the first direction, and the size of the flexible bag 21 in the second direction can be set according to the uneven degree of the tunnel working surface. The more uneven the tunnel working surface, the larger the size of the flexible bag 21 in the second direction needs to be. For example, the flexible bag 21 is a semi-cylindrical bag. Figure 3 The flexible bag 21 with a smaller diameter is suitable for a tunnel working surface with a better flatness, Figure 4 The flexible bag 21 with a larger diameter is suitable for a tunnel working surface with a poor flatness.

[0046] As shown in the drawings, one end of the flexible bag 21 in the first direction is provided with an opening. Figure 2 The flexible bag 21 is arranged in the first direction, and the first direction is perpendicular to the second direction. In the use state, the first direction is consistent with the vertical direction, the second direction is consistent with the horizontal direction, and the opening of the flexible bag 21 is located at the top of the flexible bag 21 in the first direction, so as to prevent the filling material 22 from leaking out of the flexible bag 21.

[0047] It should be noted that the flexible bag 21 can also be a closed bag that cannot be opened. The embodiment is provided with the opening for injecting and taking out the filling material 22. When not in use, the filling material 22 can be taken out, so as to reduce the weight of the whole device and improve the portability of the device.

[0048] Further, the opening of the flexible bag 21 is provided with a cover 23 for opening and closing the opening. The cover 23 is opened when the filling material 22 needs to be injected or taken out, and the cover 23 is closed when detection is performed. Alternatively, the cover 23 and the flexible bag 21 can be connected through a pull tab or through a zipper.

[0049] In some embodiments of the utility model, the flexible bag 21 is fixedly connected to the first side face 11. Alternatively, the flexible bag 21 can be detachably connected to the first side face 11, for example, the flexible bag 21 and the first side face 11 are fixedly attached through a magic tape. The multiple flexible bags 21 can be connected to the first side face 11 respectively, or the multiple flexible bags 21 can be connected as a whole and then connected to the first side face 11.

[0050] In some other embodiments, the ground penetrating radar antenna device for tunnel face further comprises a base plate (not shown in the figure). The base plate is detachably mounted on the first side face 11, and the flexible bag 21 is fixed on the side of the base plate away from the first side face 11. The base plate and the flexible bag 21 are fixed to form a coupling module, and the coupling module is detachably connected with the antenna 1 through the base plate, so that the installation of the flexible bag 21 and the antenna 1 can be facilitated. When the flexible bag 21 is damaged, the entire coupling module can be replaced. Alternatively, the base plate is detachably connected with the first side face 11 through a plurality of bolts or screws or other detachable connecting members.

[0051] As shown in Figure 1 and Figure 2 The ground penetrating radar antenna device for tunnel face provided by the embodiments of the utility model further comprises a level 31. The antenna 1 further has a second side face 12, which is arranged perpendicularly to the first side face 11, and the level 31 is mounted on the second side face 12.

[0052] When the second side face 12 is in a horizontal state, the first side face 11 is in a vertical state, so that the antenna can emit electromagnetic wave signals in a horizontal direction. In the process of collecting data for tunnel geological prediction, the level 31 is used to detect the levelness of the second side face 12, and the posture of the ground penetrating radar antenna device is adjusted accordingly, so as to ensure that the antenna emits electromagnetic wave signals in a horizontal direction.

[0053] Alternatively, the level 31 is a bubble level, and when the bubble level is centered, it indicates that the second side face 12 is in a horizontal state and the first side face 11 is in a vertical state, which means that the electromagnetic wave signals of the antenna are emitted in a horizontal direction. The level 31 can also be other forms of levels, such as an electronic level. In order to facilitate observation of the level 31, the second side face 12 is the top surface of the antenna 1 in the use state.

[0054] In the process of collecting data for tunnel geological prediction, the ground penetrating radar antenna not only needs to be close to the tunnel face, but also usually needs to move along a horizontal survey line from one side of the tunnel face to the other side point by point at a certain collection interval to complete the data collection of a survey line. In the moving process, the posture of the ground penetrating radar antenna device is prone to change, and the error is large when moving along the horizontal survey line by artificial feeling, and the survey line is not an absolute straight line, which affects the accuracy of measurement.

[0055] To this end, the ground penetrating radar antenna device for tunnel face provided by the embodiments of the utility model further comprises a laser unit 32. The two sides of the level 31 are respectively provided with laser units 32 for emitting infrared laser beams towards the side walls of the tunnel on both sides. The level 31 and the laser unit 32 are used to assist the horizontal movement of the ground penetrating radar antenna device.

[0056] Specifically, there are two laser units 32, which are installed on both sides of the level 31 or on both sides of the antenna 1, emitting infrared lasers in opposite directions. Figure 5 As shown, auxiliary marks 6 can be pre-marked on the sidewall 52 of tunnel 51. When the ground-penetrating radar antenna device moves to each acquisition point, ensure that the level 31 displays a horizontal state and that the infrared laser beams of the two laser units 32 are aligned with the auxiliary marks 6 on both sides. In this way, within a controllable error range, the horizontal movement of the ground-penetrating radar antenna device can be kept as straight as possible, thereby improving the accuracy of the horizontal positioning of the ground-penetrating radar antenna device.

[0057] Optionally, the ground-penetrating radar antenna device for tunnel face provided in this embodiment of the present invention further includes a housing 33, which is mounted on the second side 12. A level 31 and a laser unit 32 are mounted on the housing 33, the display surface of the level 31 faces the same direction as the second side 12, and the laser unit 32 is mounted on the opposite sides of the housing 33.

[0058] In this embodiment, the level 31 and laser unit 32 are integrated into the housing 33, which can be installed and fixed as a whole component with the antenna 1 to ensure the consistency of the level measurement results of the level 31 and the laser unit 32. Optionally, the housing is connected to the antenna by bolts, which facilitates the replacement of the level 31 and the laser unit 32 as a whole.

[0059] In this embodiment of the invention, a handle 4 is fixed to the side of the antenna 1 away from the first side 11. Specifically, the antenna 1 also has a third side 13, which is opposite to the first side 11, and the handle 4 is fixed to the third side 13.

[0060] Specifically, such as Figure 1 As shown, antenna 1 is rectangular in shape, with the first side 11 and the third side 13 being two parallel and opposite rectangular sides, and the second side 12 being a rectangular side connecting the first side 11 and the second side 12. There are two handles 4, spaced apart along the length of the third side 13. Flexible bags 21 extend along the width of the first side 11, and multiple semi-cylindrical flexible bags 21 are arranged sequentially along the length of the first side 11.

[0061] The specific steps for collecting ground-penetrating radar advance prediction data using the ground-penetrating radar antenna device according to this utility model embodiment are as follows:

[0062] Step 1: Based on the flatness of the tunnel face, select a semi-cylindrical flexible bag 21 of appropriate size and install it on the first side 11 of the antenna 1 to achieve the best coupling effect.

[0063] Step 2: Open the cover 23 of the flexible bag 21, inject the filler 22 into the flexible bag 21, and then close the cover 23.

[0064] Step 3: With the second side 12 of antenna 1 facing upward, attach the coupling structure 2 to the preset survey line height at the tunnel face, and adjust the attitude of the ground penetrating radar antenna device by judging the level 31 to keep antenna 1 transmitting electromagnetic wave signals in the horizontal direction.

[0065] Step 4: As Figure 5 As shown, the laser unit 32 is turned on, and infrared lasers are emitted towards the side walls 52 on both sides of the tunnel 51. Then, a circle is drawn on each side wall 52 with the laser point as the center as an auxiliary mark 6. The radius of the circle can be determined according to the error range that needs to be controlled. The smaller the movement error that needs to be controlled, the smaller the radius of the circle. During the movement of the ground penetrating radar antenna device along the survey line, it is necessary to ensure that the laser hits within the range of the auxiliary mark 6.

[0066] Step 5: Under normal circumstances, the ground-penetrating radar antenna device is moved from the far left of the tunnel face along the survey line from left to right at certain acquisition intervals to collect data.

[0067] In the aforementioned data acquisition process, firstly, coupling structure 2 ensures good coupling between the ground-penetrating radar antenna device and the tunnel face; secondly, level 31 is used to determine and adjust the attitude of the ground-penetrating radar antenna device, ensuring that antenna 1 emits electromagnetic wave signals horizontally; and thirdly, laser unit 32 and auxiliary marks on the sidewall ensure that the ground-penetrating radar antenna device moves horizontally as close to a straight line as possible. This effectively solves the problem of good coupling of the ground-penetrating radar antenna on uneven tunnel faces, as well as the problem of large horizontal positioning errors during ground-penetrating radar antenna movement on tunnel faces. Figure 6 and Figure 7 As shown, the ground-penetrating radar antenna device for tunnel faces provided by this utility model embodiment effectively improves the quality of data acquisition.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A ground penetrating radar antenna device for a tunnel face, characterized in that The utility model relates to a tunnel antenna, comprising: An antenna, the antenna has a first side, the orientation of the first side is consistent with the orientation of the signal emission end of the antenna; A coupling structure is arranged on the first side, the coupling structure is a flexible structure, can be deformed along with the concave-convex operation surface on the tunnel face and closely contact with the concave-convex operation surface.

2. The ground penetrating radar antenna device for a tunnel face according to claim 1, characterized in that The coupling structure comprises: A flexible bag and a filler, the flexible bag is used to contain the filler, and the filler can move in the flexible bag under the action of extrusion force.

3. The ground penetrating radar antenna device for a tunnel face according to claim 2, characterized in that The flexible bag is a rubber bag, and / or the filler is sand.

4. The ground penetrating radar antenna device for a tunnel face according to claim 2, characterized in that The number of flexible bags is multiple, the flexible bags are arranged along a first direction, and multiple flexible bags are arranged along a second direction, the first direction and the second direction are arranged at an angle.

5. The ground penetrating radar antenna device for a tunnel face according to claim 4, characterized in that The flexible bag is a semi-cylindrical shape.

6. The ground penetrating radar antenna device for a tunnel face according to claim 4, characterized in that One end of the flexible bag in the first direction is provided with an opening, and a cover is arranged at the opening, the cover is used to open and close the opening.

7. The ground penetrating radar antenna device for a tunnel face according to claim 2, characterized in that Further comprising: A base plate, the base plate is detachably mounted on the first side, and the flexible bag is fixed to the side of the base plate away from the first side.

8. The ground penetrating radar antenna device for a tunnel face according to claim 1, characterized in that Further comprising: A level, the antenna further has a second side, the second side is arranged perpendicularly to the first side, and the level is mounted on the second side.

9. The ground penetrating radar antenna device for a tunnel face according to claim 8, characterized in that Further comprising: A laser unit, the two sides of the level are respectively provided with the laser unit, and infrared laser is respectively emitted towards the sidewall on both sides of the tunnel.

10. The ground penetrating radar antenna device for a tunnel face according to claim 1, characterized in that The antenna is fixed with a handle on the side away from the first side.

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