CN101571600B - Integral transient electromagnetism advanced prediction measuring device - Google Patents

Abstract

The invention relates to an integral transient electromagnetism advanced prediction measuring device, wherein the integral device has the shape of a windmill. The integral transient electromagnetism advanced prediction measuring device comprises central fixed rods, wherein both ends of each central fixed rod are provided with a front disc and a rear disc respectively; a supporting device is arranged on the rear disc; a star framework is arranged on the front disc; three fixed rods in the center are parallel to each other and firmly connected with the discs at both ends of the fixed rods; the telescopic star frameworks which simultaneously have supporting function are connected with discs at the front ends of the fixed rods, and transmitting loops, receiving probes and receiving coils can be conveniently assembled and disassembled; and two splayed rods are connected with discs at the rear ends of the fixed rods for rear supporting. The integral measuring device uses nonmetallic materials, so that the interference on measuring signals can be avoided. Under the condition of measurement, the device can be used only by unfolding the star frameworks and rear supports; and when the deviceis not used, the star frameworks and the rear supports are disassembled and the integral device forms a cylinder so as to be convenient to carry. The measuring device is light and convenient, has hig h strength, convenient rolling movement and high measurement and coupling precision, and is easy for disassembly and maintenance because each joint of the device is flexible.

Description

Integrated transient electromagnetic advanced forecasting and measuring device

technical field

The invention relates to a transient electromagnetic advanced forecast technology in a tunnel or tunnel, in particular to an integrated transient electromagnetic advanced forecast measurement device.

Background technique

There are a large number of tunnel engineering projects in the fields of water conservancy, hydropower, and transportation in my country. Geological hazards in tunnel engineering are the key factors restricting tunnel construction. Often due to the unknown geological conditions ahead of tunnel excavation, unpredictable geological disasters often occur, such as water inrush, mud inrush, collapse etc. In the process of underground coal mining, geological disasters such as Laokongshui are often encountered. The consequences of these geological disasters range from washing away machines and tools, flooding tunnels, and interrupting normal construction; Huge economic losses, and even some underground projects will be forced to stop construction or reroute. Therefore, it is very necessary and meaningful to make advanced detection or prediction of these geological hazards.

As an important electromagnetic prospecting method, the transient electromagnetic method (TEM) is widely used in resource exploration and engineering survey because of its unique advantages: economical, non-destructive, fast, long detection distance and rich detection information. middle. Since the transient electromagnetic method is sensitive to low-resistance unfavorable geological bodies such as water in front of the working face, and the secondary field induced by the excited eddy current received by the receiving probe can be received regardless of the occurrence of the target body. Useful signal, and image the target body. It can be said that the transient electromagnetic method is one of the most promising methods among all advanced detection methods at present.

In the actual advanced forecasting, the transient electromagnetic method transmits a pulsed electromagnetic field to the front of the working face, and uses the receiving probe or receiving coil to observe the change of the eddy current field induced by the target in front during the field interval, so as to achieve the purpose of advanced detection or forecasting . The structure and performance of the measurement device in the transient electromagnetic equipment is one of the important factors affecting the efficiency and accuracy of the transient electromagnetic advanced forecasting. Most of the current measurement devices have no fixed structure, basically a square frame or a folded frame temporarily built on site, all of which have varying degrees of poor reception signal accuracy, difficulty in moving, poor coupling between transmitting and receiving electromagnetic fields, time-consuming and laborious measurement, installation and disassembly Disadvantages such as inconvenience. In 2007, a hand-held umbrella-shaped transient electromagnetic transmitter designed by the inventor participated in the application for an invention patent (patent number: 200710115317). Compared with the previous rough and crude The launching device has been greatly improved in all aspects. However, some problems have been found through practical use. The main defects of this device are listed below: First, the umbrella-shaped device cannot be made too large, and the length is generally not more than 1.5 meters, otherwise it will be difficult to move after the device is deployed. Difficulty; secondly, the transient electromagnetic launcher must use non-metallic materials, and several key support points of the umbrella structure are easily damaged because they are often pushed up and down; Coarse material, which increases the inconvenience of hand-holding. In addition, although the central fixing rod is hollow, it is inconvenient to install the receiving probe and its lead wires in the center of the umbrella surface due to its long length; finally, the entire launch device Each connection is basically fixed, and it is inconvenient to disassemble and maintain.

Contents of the invention

In order to overcome the deficiencies of the prior art above, the present invention provides a scalable integrated transient transmitter with good signal transmission and reception, convenient movement, adjustable measurement elevation angle, detachable assembly, portability, and high measurement and coupling accuracy. Electromagnetic advance forecast measurement device.

The present invention specifically adopts following technical scheme to realize:

An integrated transient electromagnetic advanced forecasting and measuring device, which is in the shape of a windmill as a whole, and includes a central fixed rod, and the two ends of the central fixed rod are respectively provided with front and rear discs, wherein the rear disc is provided with a support device, There is a star-shaped skeleton on the front disc.

The star-shaped framework is composed of several telescopic rods, one end of which is movably connected to the front disc, and is evenly distributed in a radial shape in the same plane, which can facilitate loading and unloading of the transmitting loop, receiving probe and receiving coil.

There are movable ring buckles on the said telescopic rods, threading holes are provided on the outward ends of the telescopic rods, and scales are provided on the surface of the telescopic rods; two of them are separated by one telescopic rod and also play the role of front-end support The end of the telescopic rod is equipped with rollers to facilitate the movement of the measuring device. Each telescopic rod can freely expand and contract within the design range. The launch loop (wire) can be fixed on the movable ring buckle.

The support device is two telescopic support rods distributed in a figure-eight shape, one end of the support rod is movably connected with the rear disc, and the other end is provided with rollers, which is easy to move; since the support rod is scalable, it cooperates with the front end to play a supporting role. The rod can adjust the elevation angle of the measurement.

The front disc is provided with a receiving probe fixing hole, a receiving probe placement hole and a number of evenly distributed central fixing rod mounting holes.

The rear disc is provided with wiring holes and a number of evenly distributed central fixing rod mounting holes.

The central fixing rod is composed of several horizontal rods that are not on the same plane and are arranged in parallel and vertically connected with the front and rear discs.

The central fixing rod is composed of three horizontal bars that are not on the same plane but are arranged in parallel and vertically connected with the front and rear discs, and the three horizontal bars are distributed in a triangle. The first reason for doing this is to firmly connect with the discs at both ends, and the second is to freely disassemble the receiving probe in the central area of the triangle surrounded by the three rods

The actual application process of the present invention is easy to operate: before use, according to the actual working conditions and measurement parameters, install the transmitting loop and the receiving probe or receiving coil as required, and then unfold the star-shaped skeleton and the rear support of the measuring device, wherein the front end The star frame faces the working surface, and the corresponding measurement can be carried out after the connection with the host is completed. After the measurement, remove the probe and wiring, fold down the star frame and the back support, and the whole device will form a cylindrical shape, which is easy to carry. In addition, each connection of the device is a live connection, which is easy to disassemble and maintain. The entire measuring device (including connecting parts) is made of non-metallic materials, which can prevent the measuring device itself from interfering with transient electromagnetic signals.

Description of drawings

Fig. 1A is a schematic diagram of the structure of the front disk part of the present invention;

Fig. 1B is a schematic diagram of the structure of the rear disk part of the present invention;

Fig. 2 is a diagram of the state of use of the present invention;

Fig. 3 is a state diagram of the present invention when it is folded and placed flat;

Fig. 4 is a state diagram of the present invention when it is folded up and placed vertically;

Among them, 1. roller, 2. transmitting loop, 3. receiving coil, 4. receiving probe fixed opening, 5. receiving probe placement hole, 6. front disc, 7. telescopic rod, 8. movable ring buckle, 9. center fixing rod mounting hole, 10. threading hole, 11. center fixing rod, 12. rear disc, 13. wiring (cable) hole, 14. support rod, 15. star-shaped skeleton, 16. working surface.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Embodiment 1: Among Fig. 1-4, device overall is windmill shape, and it comprises central fixed rod 11, and the two ends of central fixed rod 11 are respectively provided with front and rear disc 6,12, and wherein, 12 is set on the rear disc There is a supporting device, and the front disc 6 is provided with a star-shaped skeleton 15 .

The star frame 15 is made up of eight telescopic rods 7 that are movably connected to the front disc 6 at one end and are evenly distributed in the same plane, which can facilitate the loading and unloading of the transmitting loop, the receiving probe and the receiving coil.

The telescopic rod 7 is provided with movable ring buckles 8, and the outward end of the telescopic rod 7 is provided with threading holes 10, and the surface of the telescopic rod 7 is provided with scales; The end of the telescopic rod 7 supporting the front end is provided with a roller 1 to facilitate the movement of the measuring device. Every telescopic rod 7 can freely expand and contract within the design range. The launch loop (wire) 2 can be fixed on the movable ring buckle 8.

The support device is two telescopic support rods 14 distributed in a figure-eight shape, one end of the support rods 14 is flexibly connected with the rear disc 12, and the other end is provided with a roller 1, which is easy to move; since the support rods 14 are scalable, they cooperate with the front end to play a supporting role The telescopic rod 7 can adjust the elevation angle of the measurement.

The front disc 6 is provided with a receiving probe fixing hole 4, a receiving probe placement hole 5 and three center fixing rod mounting holes 9 evenly distributed.

The rear disc 12 is provided with wiring (cable) holes 13 and three uniformly distributed central fixing rod mounting holes 9 .

The central fixed rod 11 is made up of three horizontal bars that are not on the same plane and are arranged in parallel and vertically connected with the front and rear discs 6, 12, and the three horizontal bars are distributed in a triangle. The first is to be connected firmly with the front and rear discs 6, 12, and the second is to freely disassemble the receiving probe in the triangular central area surrounded by three bars.

Adopt quadrilateral loop to launch and probe to receive. Firstly, unfold the entire measuring device and face the working surface 16, as shown in Fig. 2 . According to the measurement parameters, such as the size of the wire frame and the elevation angle of the measurement, the purpose can be achieved by adjusting the length of the front and rear telescopic rods 7 and the length of the support rods 14. It should be noted that the eight telescopic rods at the front end only need to be spaced apart. Adjust four telescopic rods 7 that are perpendicular to each other and get final product. The launch loop 2 is fixed on the threading hole 10, and can also be fixed on the movable ring buckle 8. The receiving probe is placed on the receiving probe placement hole 5, and the probe is fixed through the receiving probe fixing hole 4 with the prepared bolts. Finally, connect the transmitting loop 2 and the lead wire of the receiving probe to the host of the transient electromagnetic instrument through the routing (cable) hole 13, and then the measurement work can be carried out.

At this time, in order to reduce electromagnetic interference, it is best not to hang up the receiving coil 3 . During the measurement, if it is necessary to move from one measurement point to another, it can be realized by moving the roller 1 . After the measurement work is finished, the lead wire and the probe are first unloaded, and the launch loop 2 can not be unloaded for the next use. Finally, the star frame 15 and the support rod 14 at the front and rear ends are folded down, and the stowed state is shown in Fig. 3 and Fig. 4 .

Embodiment 2: Octagonal loop emission (approximate circular emission), probe reception. Eight telescopic rods 7 are stretched to be the same length, and all the other are the same as embodiment 1.

Embodiment 3: The quadrilateral loop transmits, and the receiving coil 3 receives. Hang up the receiving coil 3, remove the receiving probe, and the rest are the same as in Embodiment 1.

Embodiment 4: Octagonal loop transmission (approximate circular transmission), probe coil 3 reception. Hang up the receiving coil 3, unload the receiving probe, and the rest are the same as in Embodiment 2.

Embodiment 5: The quadrilateral loop transmits, and the receiving probe and the receiving coil 3 receive together. When there are two transient electromagnetic receivers, or the transient electromagnetic receiver is a dual-channel premise, in order to do some research work, you can hang the receiving probe and the receiving wire frame together, and the rest are the same as in Example 1.

Embodiment 6: Octagonal loop transmission (approximately circular transmission), the receiving probe and the receiving coil 3 receive together. The receiving coil 3 at this moment can only be fixed with the movable ring buckle 8 . The rest are the same as Example 5.

Claims (1)

1. An integrated transient electromagnetic advanced forecasting and measuring device, characterized in that it includes a central fixed rod, and the two ends of the central fixed rod are respectively provided with front and rear discs, wherein the rear disc is provided with a supporting device, and the front disc There is a star-shaped skeleton on the plate; The star-shaped skeleton is composed of several telescopic rods that are movably connected to the front disc at one end and are evenly distributed in the same plane in a radial manner; The said telescopic rods are all provided with movable ring buckles, the outward ends of the telescopic rods are all provided with threading holes, and the surfaces of the telescopic rods are all provided with scales; There are rollers at the end of the telescopic rod; The support device is two telescopic support rods distributed in a figure-eight shape, one end of the support rod is movably connected with the rear disc, and the other end is provided with a roller; The front disc is provided with a receiving probe fixing hole, a receiving probe placement hole and a number of evenly distributed central fixing rod installation holes; The rear disc is provided with wire routing holes and a number of evenly distributed central fixing rod mounting holes; The central fixing rod is composed of several horizontal rods that are not on the same plane and are arranged in parallel and vertically connected with the front and rear discs; The central fixing rod is composed of three horizontal bars that are not on the same plane but are arranged in parallel and vertically connected with the front and rear discs, and the three horizontal bars are distributed in a triangle.

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