CN203375935U - Tunnel convergence displacement and vault settlement measurement device - Google Patents

Abstract

The utility model provides a measuring device for tunnel convergence displacement and vault settlement. The measuring device is installed on the wall of the tunnel, and includes a alignment device fixed on the tunnel wall and a laser distance measuring sensor installed on the alignment device. And the reflective sheet installed at the measuring point on the tunnel wall. The alignment device includes a base, and a ball socket is arranged in the base, and the ball socket is spherically matched with a ball-end rotor, and the ball-end rotor is fixedly connected with the laser distance measuring sensor, and a locking device is provided between the ball socket and the ball-end rotor . The base is fixedly installed on the wall of the tunnel through an expansion screw, and the thread length at the end of the expansion screw is shorter than the length of the threaded hole on the base of the alignment device. The device also includes an external trigger line and an external trigger button connected to the laser range sensor. Only one measuring device is needed to complete the measurement of the convergence displacement and vault settlement of the entire tunnel, and the measurement results are accurate, which meets the requirements of multiple measurement lines, high frequency and large total amount of tunnel convergence monitoring.

Description

Measuring device for tunnel convergence displacement and vault settlement

technical field

The utility model relates to a relative displacement measuring device for monitoring the walls and structures of tunnels and underground engineering, in particular to a device for measuring the convergent displacement around the tunnel and the settlement of the vault.

Background technique

In the process of tunnel construction and operation and maintenance, the stability of the surrounding rock or structure of the tunnel can be clearly and intuitively judged through the measurement of the change in the clearance size around the tunnel, that is, the measurement of the convergence displacement around the tunnel. Therefore, convergence displacement is a routine monitoring item in tunnel monitoring, and convergence gauge and level are the most important instruments for monitoring tunnel convergence displacement.

Convergence displacement monitoring around the tunnel mainly uses a rod-scale extensometer or a string-type extensometer, that is, a hook is fixed at the tunnel measuring point, and the extensometer is hung on the measuring point hook during measurement to read the distance between the measuring points. This traditional convergent gauge is a contact convergent gauge with a complex structure and requires a cumbersome installation process during the measurement. Errors generated during the installation process will lead to measurement accuracy cannot be guaranteed. During the monitoring process, the extensometers suspended at the measuring points around the tunnel will also affect the normal construction work in the tunnel. The traditional convergence gauge needs to be tightened before reading, so it needs to be monitored after the strength of the shotcrete is formed, which affects the timeliness of point layout and causes a partial loss of the convergence displacement monitoring value.

The traditional monitoring of tunnel vault settlement uses a level instrument, which is hung on the hook of the vault measuring point during measurement, and then the high-level measurement is carried out. The measuring point of the vault is relatively high (more than 6 meters), and it is very difficult to hang. The scale suspended at the measuring point of the tunnel vault during the monitoring process will also affect the normal construction work in the tunnel.

There are also some studies on tunnel convergence displacement measurement based on the principle of laser ranging at home and abroad, and the devices involved in these studies have relatively complex structures or large sizes. During the entire monitoring period, the fixing device of the laser ranging sensor needs to be installed on the tunnel wall, which is easily affected by blasting vibration or mechanical impact, which affects the monitoring accuracy and may even damage the measuring device. In addition, due to the limitation of the structure of the fixture, some laser ranging sensors have specific requirements for the installation position of the measuring point and the instrument, otherwise the laser emitting end cannot be aligned with the target point to be measured.

In the method of measuring the convergent displacement around the tunnel with the existing convergent gauge or laser rangefinder sensor, each measuring line needs to be installed with a convergent gauge or a corresponding laser rangefinder fixture. There are many monitoring lines, high frequency, and large total volume requirements.

Utility model content

In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a measuring device that can accurately measure the convergence displacement and vault settlement of the entire tunnel by using only one laser ranging sensor.

In order to achieve the above technical problems, the utility model provides a measuring device for tunnel convergence displacement and vault settlement, which is installed on the wall of the tunnel, including: an alignment device fixed on the wall of the tunnel; The laser ranging sensor on the line device and the reflective sheet installed at the measuring point on the wall of the tunnel; Spherical fit, the ball rotor is fixedly connected to the laser distance measuring sensor, and a locking device is provided between the ball socket and the ball rotor.

Preferably, screws are fixed on the spherical rotor, and the laser ranging sensor is connected to the spherical rotor by threads.

Further preferably, the bottom of the laser distance measuring sensor is provided with a threaded hole, and the length of the screw is shorter than the length of the threaded hole.

Preferably, the locking device is a locking screw installed on the base, the head of the locking screw is exposed from the base, and the tail of the locking screw goes deep into the ball socket .

Preferably, the base is fixedly installed on the wall of the tunnel by an expansion screw.

Further preferably, the end of the expansion screw is provided with a thread, and the base is provided with a threaded hole matching with the thread, and the length of the thread is shorter than the length of the threaded hole.

Preferably, the measuring device for tunnel convergence displacement and vault settlement further includes an external trigger line and an external trigger button connected to the laser distance measuring sensor.

As mentioned above, the measuring device for tunnel convergence displacement and vault settlement of the utility model has the following beneficial effects:

1. In most of the daily monitoring, only one measuring device is needed to complete the measurement of the vault settlement and convergence displacement of the entire tunnel, and the measurement results are accurate, which meets the requirements of the horizontal displacement of the tunnel wall and the vault settlement monitoring. High frequency and large volume requirements;

2. The laser ranging sensor is installed on the measuring point on the tunnel wall through a detachable alignment device. When no measurement is needed, the alignment device and the laser ranging sensor can be removed from the tunnel wall, and the installation and measurement can be carried out at any time to avoid damage to the measuring device;

3. After the laser ranging sensor is installed on the alignment device, the angle of laser emission can be adjusted arbitrarily by rotating the ball head rotor, so as to realize the precise alignment of the measuring line between measuring points;

4. The length of the thread at the end of the expansion screw is shorter than the length of the matching threaded hole on the base, so that the alignment device is screwed into the same position every time, ensuring the accuracy of alignment;

5. When measuring the vault settlement of the tunnel, there is no need to install the measuring device on the tunnel vault. The laser ranging sensor has an external trigger line and an external trigger button, which avoids large measurement errors caused by direct contact keys;

6. The point contact between the ball socket and the ball head rotor of the alignment device effectively solves the problem of poor measurement stability and Problems such as poor repeatability.

Description of drawings

Fig. 1 shows the schematic diagram of the measuring device for the tunnel convergence displacement and vault settlement of the utility model.

Figure 2 shows a partially enlarged view of Figure 1 .

Detailed ways

The implementation of the present utility model is illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

Please refer to attached picture. It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the utility model Therefore, it has no technical substantive meaning. Any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope of The technical content disclosed by the utility model must be within the scope covered. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable range of the utility model, and the change or adjustment of its relative relationship, without any substantial change in the technical content, shall also be regarded as the practicable scope of the utility model.

As shown in Figure 1, it is a schematic diagram of a measuring device for tunnel convergence displacement and vault settlement. The measuring device includes an alignment device 2 fixedly installed on the tunnel wall 1, and a laser distance measuring sensor installed on the alignment device 2. 3 and the reflective sheet 4 installed on the tunnel wall 1 measuring point. Fig. 2 is a partially enlarged view of Fig. 1, as shown in Fig. 2, the alignment device 2 includes a base 21, and a ball socket 211 is arranged in the base 21, and the ball socket 211 is spherically matched with a ball head rotor 212, and the ball head The rotor 212 is fixedly connected to the laser ranging sensor 3 , and a locking device 5 is provided between the ball socket 211 and the ball-end rotor 212 .

The ball rotor 212 is fixed with a screw 2121 , and the laser distance measuring sensor 3 is provided with a threaded hole 31 that can cooperate with the screw 2121 on the ball rotor 212 . The length of the screw 2121 is shorter than the length of the threaded hole 31 . When the laser distance measuring sensor 3 is installed, it can be screwed into the same fixed position every time. In the embodiment, the locking device 5 is a locking screw 51 installed on the base 21, the head 511 of the locking screw 51 is exposed to the base 21, and the tail 512 of the locking screw 51 goes deep into the ball socket 211 . The base 21 is fixedly installed on the tunnel wall 1 through an expansion screw 6, and the end of the expansion screw 6 is exposed and fixed to the length of the thread 61 on the tunnel wall 1, and its length is shorter than that of the threaded hole 213 matched with it on the base 21. length, so that the base 21 is installed in the same fixed position every time, so it has higher alignment accuracy.

When using the measuring device for tunnel convergence displacement and vault settlement provided by the utility model to measure convergence displacement and vault settlement, the position of the point to be measured is selected according to the convergence measurement line in the tunnel monitoring section, and one of them is to be measured. Install the expansion screw 6 at the point, and arrange the reflective sheet 4 on the tunnel wall 1 at the other points to be measured, so that the reflective surface is as perpendicular as possible to the measuring line. Screw the alignment device 2 connected with the laser ranging sensor 3 to the expansion screw 6 fixed on the tunnel wall 1, and the angle of laser emission can be adjusted arbitrarily by rotating the ball head rotor 212, so as to realize the precise determination of the measuring line between measuring points Wire. After aiming the laser point at the center of the reflective sheet 4 at the point to be measured, rotate the head 511 of the locking screw 51 so that the tail 512 of the locking screw 51 goes deep into the ball socket 211 and tightens the ball head rotor 212, thereby locking the laser beam. The position of distance sensor 3. Due to the point contact between the ball socket 211 and the ball head rotor 212, it effectively solves the poor stability and repeatability of the measurement results caused by the surface contact between the measuring instrument and the fixing device after the installation of the traditional convergence gauge or laser distance measuring sensor. question.

When the measurement is not needed, the alignment device 2 and the laser distance measuring sensor 3 can be removed from the tunnel wall 1, and when necessary, the measurement can be installed at any time, without affecting the normal construction of the tunnel and avoiding damage to the measuring device. The measuring device for tunnel convergence displacement and vault settlement also includes an external trigger line connected to the laser distance measuring sensor 3 and an external trigger button, which can eliminate the measurement caused by the trigger device directly in contact with the laser distance measuring sensor 3 when the key is pressed. error. When the laser point of the laser ranging sensor 3 is aimed at the center of the reflective sheet 4 at the point to be measured, press the external trigger button to record the reading. The laser distance measuring sensor 3 has a serial number storage function and a clock timing function for the measurement results, has enough memory, and the data interface can import the data into the computer, and the data resolution is 0.1mm.

The device is also used to measure the settlement of the vault of the tunnel. If the vault settlement is measured using the traditional level measurement method, since the vault is high from the ground, it is not conducive to the suspension of the scale, and the measurement accuracy will also be affected. The measuring device provided by the utility model does not need to hang a ruler on the vault of the tunnel, and only needs a set of measuring devices to complete the measurement of the settlement of the vault of the entire tunnel.

To sum up, the utility model effectively overcomes various shortcomings in the prior art and has high industrial application value.

The above-mentioned embodiments only illustrate the principles and effects of the present utility model, but are not intended to limit the present utility model. Anyone familiar with this technology can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the utility model should still be covered by the claims of the utility model.

Claims (7)

1. A measuring device for tunnel convergence displacement and vault settlement, installed on the tunnel wall (1), characterized in that it includes: a line setting device (2) fixedly installed on the tunnel wall (1), The laser ranging sensor (3) installed on the alignment device (2) and the reflective sheet (4) installed on the measuring point of the tunnel wall (1); the alignment device (2) includes a base (21), a ball socket (211) is provided in the base, and the ball socket (211) is spherically matched with a ball head rotor (212), and the ball head rotor (212) is connected with the laser distance measuring sensor (3) Fixed connection, a locking device (5) is provided between the ball socket (211) and the ball-end rotor (212). 2. The measuring device for tunnel convergence displacement and vault settlement according to claim 1, characterized in that: the ball head rotor (212) is fixed with a screw (2121), and the laser ranging sensor (3) is connected with The ball rotors (212) are threaded. 3. The measuring device for tunnel convergence displacement and vault settlement according to claim 2, characterized in that: the bottom of the laser ranging sensor (3) is provided with a threaded hole (31), and the length of the screw (2121) is shorter than the length of the threaded hole (31). 4. The measuring device for tunnel convergence displacement and vault settlement according to claim 1, characterized in that: the locking device (5) is a locking screw (51) installed on the base (21) ), the head (511) of the locking screw (51) is exposed on the base (21), and the tail (512) of the locking screw (51) goes deep into the ball socket (211). 5. The measuring device for tunnel convergence displacement and vault settlement according to claim 1, characterized in that: the base (21) is fixedly installed on the tunnel wall (1) by an expansion screw (6) . 6. The measuring device for tunnel convergence displacement and vault settlement according to claim 5, characterized in that: the end of the expansion screw (6) is provided with a screw thread (61), and the base (21) is provided with There is a threaded hole (213) matched with the threaded thread (61), and the length of the threaded thread (61) is shorter than the length of the threaded hole (213). 7. The device for measuring tunnel convergence displacement and vault settlement according to claim 1, further comprising: an external trigger line and an external trigger button connected to the laser distance measuring sensor (3).

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