CN206292404U - A kind of Tunnel prediction device based on elastic wave reflex method - Google Patents

Abstract

The utility model discloses a tunnel advance forecasting device based on the elastic wave reflection method. The device includes a traveling mechanism, an exciting mechanism and a controller. The vibration mechanism is used for lifting adjustment; the vibration mechanism includes a vibration hammer and a speed/acceleration detector. The controller controls the vibration hammer to apply an excitation force to the predicted position of the palm face. Reflection and transmission occur on the surface, and the waveform is recorded by the velocity/acceleration detector and fed back to the controller, which records the waveform for analysis. The utility model has a simple structure and an ingenious design, and can be flexibly adjusted by using the azimuth control, the traveling wheels and the retractable mechanism, thereby improving the flexibility of the advance forecast of the tunnel.

Description

A Tunnel Advanced Forecasting Device Based on Elastic Wave Reflection Method

technical field

The utility model relates to a tunnel advance forecasting device based on elastic wave reflection method.

Background technique

With the rapid development of my country's transportation construction, the country's highway and railway networks are being planned and improved. In order to meet economic development and people's needs, when highways and railways enter mountainous areas, it is inevitable to use tunnels to cross them. Tunnel is a "lifeline" project and also an underground project. Its concealment and engineering geological conditions of the mountain will pose a major hidden danger to construction safety. Accurate forecasting of geological disasters in front of the tunnel face and supplementing with appropriate construction measures can Effectively avoid disasters.

In the field of advance prediction, geophysical methods such as TSP method and ground radar detection method have played beneficial effects and are widely used in the field of tunnel advance prediction, but they still have shortcomings. First of all, in the TSP method, the distance between the receiver and the tunnel surface is about 55m, and holes need to be drilled in advance and blasted. If the surface has better coupling, metal objects will also have a greater impact on the radar detection results.

In view of the above problems, there is an urgent need for a reasonable and flexible new equipment and method, so that the geophysical methods can be mutually assisted and mutually confirmed, so as to improve the accuracy of geophysical prospecting and the safety of construction operations.

Utility model content

In order to solve the above problems, the utility model proposes a tunnel advance forecasting device based on the elastic wave reflection method. The utility model is convenient, can detect the geological conditions in front of the tunnel face, and improves construction safety.

In order to achieve the above object, the utility model adopts the following technical solutions:

A tunnel advance forecasting device based on the elastic wave reflection method, comprising a traveling mechanism, an exciting mechanism and a controller, the exciting mechanism is fixed on the traveling mechanism through a telescopic mechanism, and the telescopic mechanism drives the exciting mechanism to perform lifting adjustment;

The vibration excitation mechanism includes a vibration hammer and a velocity/acceleration detector. The controller controls the vibration hammer to apply an excitation force to the predicted position of the face. The elastic wave caused by the vibration force is reflected on different wave impedance surfaces, In transmission, the waveform is recorded by the velocity/acceleration detector and fed back to the controller, which records the waveform.

The traveling mechanism includes a car body, the lower end of the car body is provided with traveling wheels, and a direction handle for controlling the angle of the traveling mechanism is fixed on the car body.

The telescopic mechanism includes a telescopic support rod and a plurality of fastening bolts, and the fastening bolts are sequentially arranged on the telescopic support rod to realize step-wise expansion and contraction of the telescopic support rod.

The top of the telescopic support rod is provided with a fixing groove for fixing the vibration excitation mechanism.

The vibration excitation mechanism is connected to the telescopic mechanism through a connecting rod, a plurality of telescopic push rods are arranged on the vibration excitation surface of the vibration excitation mechanism, and an excitation hammer is arranged at the end of each telescopic push rod.

There are multiple speed/acceleration detectors of the vibration excitation mechanism, which are evenly arranged on the vibration excitation surface.

The controller communicates with the remote control PC.

Based on the above method of using the tunnel advance forecasting device, lift the telescopic mechanism to the height to be measured, push the traveling mechanism, bring the vibration excitation mechanism to the position to be measured, make the speed/acceleration detector fit the tunnel face, and use the control Set the floating-point amplification, gain, unit and excitation parameters of the controller, control the vibration hammer to realize the excitation, and the speed/acceleration detector transmits the received signal to the controller, and conducts comprehensive analysis according to the amplitude and phase factors.

The analysis method is common knowledge of elastic wave principle. The basic principle is: if the structural integrity of the surrounding rock is good, the waveform is gentle; if there is a high reflection amplitude, it means that the rock density at the reflection interface is high; A reflection amplitude with a negative phase in the waveform indicates that the reflection interface is weak.

The speed/acceleration detector is fitted to the position to be measured on the tunnel face for vibration excitation. The telescopic push rod pushes the vibration hammer to the tunnel face and retracts it after applying the hammering force to realize multi-point excitation and multi-point vibration. signal reception.

The beneficial effects of the utility model are:

(1) The utility model has a simple structure and an ingenious design. It can be adjusted flexibly by using azimuth control, traveling wheels and a telescopic mechanism, which improves the flexibility of tunnel forecasting;

(2) The excitation source of the utility model and the receiver detector are on the same excitation surface, realizing the real-time feedback of the forecast result;

(3) Combined with other geophysical prospecting methods, the accuracy of advanced forecasting is improved. Multi-solution is an inherent attribute of geophysical detection. The utility model can be combined with geological radar detection based on different principles, which is beneficial to narrowing the range of solutions, corroborating with detection results, and improving the accuracy of advanced forecasting.

(4) Simple operation, wide applicability, minimal disturbance to the face during forecasting, avoiding safety risks in advance forecasting

Description of drawings

Fig. 1 Schematic diagram of tunnel advanced forecasting system based on elastic wave reflection method;

Fig. 2 schematic diagram of control and data processing device;

Fig. 3 schematic diagram of excitation receiving device;

Figure 4 Plan view of the vibration receiving device.

In the figure, 1—vibration mechanism; 2—connecting rod; 3—heavy caster; 4—extensible support rod; 5—advanced forecasting system body; 6—fixing groove; 7—fastening bolt; 9—fastening bolt; 10—control and data processing device (PDA); 11—console; 12—direction handle; 13—touchable LCD display; 14—power button; 15—selection button; 16—data transmission Connection slot; 17—setting button; 18—filter button; 19—excitation button; 20—analysis button; 21—exciting hammer; 22—extensible push rod; 23—velocity/acceleration detector.

detailed description:

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1, a tunnel forecast system based on the elastic wave reflection method includes a traveling mechanism, an excitation mechanism and a control mechanism. The walking mechanism includes casters and direction handles to control the orientation of the forecasting system. The vibration excitation mechanism includes a height adjustment device and an excitation device. The height adjustment device is composed of a fastening bolt and a telescopic support rod. The telescopic support rod realizes lifting, and the fastening bolt plays a fixing role. The vibration excitation device includes a vibration hammer and a velocity/acceleration detector. The control mechanism controls the vibration hammer to apply an excitation force to the predicted position of the face. The elastic wave caused by the excitation force is reflected and transmitted on different wave impedance surfaces. The velocity/acceleration detector records the waveform, and is processed, recorded and analyzed by the PDA in the control device.

The heavy-duty casters 8 improve the flexibility of the advanced forecasting system. The walking direction is controlled by the direction handle 12. The forecaster pushes the direction handle and controls it to be lowered.

Exciting mechanism: the exciting device includes a vibrating hammer head 21 , a retractable vibrating hammer body 22 and a velocity/acceleration detector 23 . The height adjustment device comprises a telescopic support rod 4 and a fastening bolt. The forecaster rotates the fastening bolts to adjust the height of the forecast area, adjusts the orientation of the forecast system through the traveling mechanism, and makes the speed/acceleration detector fit the position to be tested on the tunnel face, press the excitation button 19, and the retractable push rod 22 The vibrating hammer 21 is pushed out toward the face of the palm, retracted after applying the hammering force, so as to realize multi-point excitation and multi-point signal reception. The wave detector records the received elastic wave velocity signal and acceleration signal, and wirelessly transmits it to the control and data processing device 10 .

Control mechanism: the control mechanism is composed of a console 11 and a control and data processing device 10 . The control and data processing device is a PDA based on the Android system, which includes a power button 14, a selection button 15, a setting button 17, a filter button 18, an excitation button 19 and an analysis button 20, and it is docked with the console through a data transmission connection slot 16 , its data connection slot can transmit the measured data to the PC through the data line.

The steps of the method of use of the present utility model will be clearly and completely described below.

Adjust the fastening bolts so that the telescopic support rod reaches the height to be measured, push the forecasting system to the position to be measured, make the speed/acceleration detector 23 fit the tunnel face, and connect the control with the data transmission in the data processing device 10 Slot 16 is docked with console 11, and power button 14 is turned on to complete the forecasting preparation work; click setting button 17 to automatically set floating-point amplification, gain, unit and excitation parameters, and also select manual setting parameters by selecting button 15; parameter setting After completion, press the excitation button to realize excitation, the speed/acceleration detector 23 will transmit the received signal to the console, the forecaster presses the analysis button 20, and the data processing device will perform comprehensive analysis based on factors such as amplitude and phase to give the analysis result ; The data transmission connection slot 16 can transmit the data to the PC for further processing and analysis, so as to improve the forecast accuracy.

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model.

Claims (7)

1. a kind of Tunnel prediction device based on elastic wave reflex method, it is characterized in that：Including walking mechanism, exciting agency and Controller, the exciting agency is fixed in walking mechanism by telescopic mechanism, and telescopic mechanism drive exciting agency is carried out Lift adjustment；

The exciting agency includes exciting hammer and speed/acceleration wave detector, and the controller control exciting hammer is pre- to face Report position applies exciting force, and the elastic wave that exciting force causes occurs reflection, transmission in different wave impedance faces, by speed/acceleration Wave detector wave recording, and controller is fed back to, the controller wave recording.

2. a kind of Tunnel prediction device based on elastic wave reflex method as claimed in claim 1, it is characterized in that：The row Mechanism, including car body are walked, the car body lower end is provided with road wheel, the direction handle of control walking mechanism angle is fixed with car body Hand.

3. a kind of Tunnel prediction device based on elastic wave reflex method as claimed in claim 1, it is characterized in that：It is described can Telescoping mechanism includes retractable support lever and multiple fastening bolts, and the fastening bolt is set in turn on retractable support lever, Realize that the gradin of retractable support lever stretches.

4. a kind of Tunnel prediction device based on elastic wave reflex method as claimed in claim 3, it is characterized in that：It is described can The fixing groove for fixing exciting agency is provided with the top of telescopic supporting rod.

5. a kind of Tunnel prediction device based on elastic wave reflex method as claimed in claim 1, it is characterized in that：It is described to swash Mechanism of shaking is connected on telescopic mechanism by connecting rod, and multiple scalable push away is provided with the exciting face of the exciting agency Bar, each scalable push rod end is provided with exciting hammer.

6. a kind of Tunnel prediction device based on elastic wave reflex method as claimed in claim 1, it is characterized in that：It is described to swash Shake mechanism speed/acceleration wave detector for multiple, be uniformly arranged on exciting face.

7. a kind of Tunnel prediction device based on elastic wave reflex method as claimed in claim 1, it is characterized in that：The control Device processed communicates with remote control PC ends.