Surveying device for measuring horizontal displacement of soil body

[0015] This application will be further described in conjunction with the following embodiments.

[0016] An inclinometer for measuring the horizontal displacement of a soil body of the present application is used to observe the horizontal displacement inside the soil body. Such as figure 1 with figure 2 As shown, it includes an inclinometer tube 1, a tension member 2, a plurality of ranging sensors 3, and a data acquisition and processing device 4 connected to each ranging sensor 3. The inclinometer tube 1 can be a PVC inclinometer tube or an inclinometer tube made of other materials, as long as it can be used with the ranging sensor 3. The tension member 2 may be a metal or non-metal material with a low thermal expansion coefficient, such as indium steel wire. Preferably, when the distance measuring sensor 3 adopts an eddy current sensor or a magnetic induction sensor, the tension member 2 is made of a metal material. The distance between adjacent ranging sensors can be equal or unequal.

[0017] The tension member 2 is tensioned between the upper and lower ends of the inclinometer tube 1. Preferably, the tension member 2 is arranged on the central axis of the inclinometer tube 1, the tension member 2 is in a tensioned state, the distance measuring sensors 3 are arranged at intervals along the length of the inclinometer tube 1, and each distance sensor 3 measures its The horizontal distance from the tension member 2 directly in front. After the inclinometer tube 1 is installed, the tension member 2 is tightened along the central axis of the inclinometer tube 1, and each distance measuring sensor 3 is connected to the data acquisition and processing device 4.

[0018] If the soil is displaced, the inclinometer tube 1 will be tilted, so that the distance between each ranging sensor 3 and the tensioning member 2 will change, and each ranging sensor 3 will measure the distance between it and the tensioning member 2. Level distance and send the distance information to the data collection and processing device 4 for processing. The data collection and processing device 4 calculates the corresponding changes in the collected distance information and the depth position of each sensor, and the level of the soil can be drawn Displacement curve, that is, soil slope measurement, realizes the purpose of automatic and accurate monitoring. The specific principle is that when the soil is displaced, there will be two effects. One is that the top position of the inclinometer tube 1 appears horizontally; the other is that the inclinometer tube 1 may have an S-shape or multiple bends. Draw out the distance change value of each distance measuring sensor 3 on the tube wall of the inclinometer tube 1 and the tension member 2, and then superimpose the influence of the horizontal displacement of the top position of the inclinometer tube 1 to directly plot the horizontal displacement of the soil that meets the requirements of the specification curve. Since the inexpensive ranging sensor 3 is used to replace the expensive inclination sensor, the monitoring cost is greatly reduced.

[0019] In this application, the bottom end of the inclinometer tube 1 is covered with a chassis, the top end of the inclinometer tube 1 is covered with a top cover, and the two ends of the tension member 2 respectively fix the center position of the chassis and the center of the top cover, so as to facilitate the tension member 2Fixed in the inclinometer tube 1. Preferably, the tension member 2 is an indium steel wire, which has a low thermal expansion coefficient, and will not relax even if the temperature changes greatly, so that the tension member 2 is always kept in a tensioned state, and the measurement error of the distance measuring sensor 3 is reduced.

[0020] The distance measuring sensor 3 may be a contact sensor. Preferably, the contact sensor is a magnetoresistive displacement sensor, a drawstring displacement sensor, an LVDT displacement sensor, a capacitive displacement sensor or an inductive displacement sensor. The inductive displacement sensor can be installed on the inner or outer wall of the inclinometer tube 1 (measuring holes are required); while the pull rope displacement sensor can only be installed on the outer wall of the inclinometer tube with measuring holes (not shown in the figure). The flexible pull cord of the displacement sensor passes through the measuring hole and is connected to the tension member 2 in front of it. Waterproof measures should be taken between the measuring hole and the rope displacement sensor.

[0021] The distance measuring sensor 3 may also be a non-contact sensor. Preferably, the non-contact sensor is an eddy current displacement sensor, a magnetic induction displacement sensor, an ultrasonic displacement sensor or a photoelectric displacement sensor. Among them, the eddy current displacement sensor, the magnetic induction displacement sensor and the ultrasonic displacement sensor can be installed on the inner or outer wall of the inclinometer tube 1 (without measuring holes); and the photoelectric displacement sensor can be installed on the inner wall of the inclinometer tube 1 or installed in the The outer wall of the inclinometer tube 1 of the hole, and the signal reflection end of the photoelectric displacement sensor is facing the measuring hole. When different distance measuring sensors are used, the tensioner 2 and the inclinometer tube 1 can be adaptively selected or adjusted as required.

[0022] Preferably, considering that if a thinner tension member 2 is used, it will become more difficult for the ranging sensor 3 to capture the tension member 2. At this time, in order to improve the accuracy of ranging, such as image 3 As shown, the tension member 2 directly in front of each ranging sensor 3 can be fixed with a signal reflector 5, and each signal reflector 5 reflects the signal sent by its corresponding ranging sensor 3. The signal reflector may have a shape such as a spherical shape, a cylindrical shape, or a cross shape.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, rather than to limit the scope of protection. Although the application has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that, The technical solution of the present application can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the present application.