CN218822143U - Mounting bracket of single-point displacement meter and single-point displacement measuring device - Google Patents

Abstract

The utility model discloses a mounting bracket of a single-point displacement meter and a single-point displacement measuring device, wherein the single-point displacement meter comprises a solenoid coil and a piston rod which are displaced up and down relatively, and the mounting bracket comprises a protective outer cover, a connecting cylinder and a measuring rod; a drill hole is formed in the surrounding rock to be detected, the measuring rod is installed in the drill hole, and the upper end of the measuring rod is fixed in the surrounding rock through a resin anchoring agent; the connecting cylinder comprises an upper part and a lower part which are movably connected; the upper end of the protective outer cover is fixed on the surrounding rock, and the lower end of the protective outer cover is fixedly connected with a solenoid coil of the displacement meter; the upper part of the connecting cylinder is fixedly connected with the lower end of the measuring rod, and the lower part of the connecting cylinder is fixedly connected with the piston rod. The utility model provides an inductance frequency modulation formula single-point displacement meter anchor head anchor difficulty, displacement meter solenoid coil be difficult to the fixed problem, can ensure the reliability of inductance frequency modulation formula single-point displacement meter installation and the accuracy of measuration data.

Description

A mounting bracket for a single-point displacement meter and a single-point displacement measuring device

technical field

The utility model relates to the technical field of tunnel and underground engineering testing, in particular to a mounting bracket for a single-point displacement meter and a single-point displacement measuring device.

Background technique

The internal displacement of the surrounding rock is an important index that objectively reflects the loosening range of the rock mass and the stable state of the surrounding rock, and is an important basis for the optimization of support parameters such as bolts and cables. Single-point displacement meters are widely used in the internal displacement measurement of surrounding rocks in tunnels and underground engineering, and have various types such as vibrating wire type, fiber grating type, and inductive frequency modulation type.

Inductive frequency modulation single point displacement meter is designed by the principle of inductive magnetic flux frequency modulation technology. The magnetic conductor piston rod fixed to the tie rod is inserted into the solenoid coil and can move back and forth. The inductance of the coil is related to the length of the magnetic conductor piston rod inserted into the coil. When a displacement occurs, it will cause a change in the inductance of the coil. The inductance frequency modulation circuit converts the change in the inductance of the coil into a frequency signal, and the displacement value can be displayed by the reading instrument. Compared with other types of single-point displacement gauges, the inductive frequency-modulated single-point displacement gauge has higher stability, reliability and durability.

The inductance frequency modulation single-point displacement meter is composed of the displacement meter body (including the magnetic conductor piston rod and the solenoid coil), the stainless steel steel measuring rod, the PVC measuring rod protection tube, the anchor head, etc., and the anchor head needs to be drilled and grouted. Buried and fixed, the degree of fixation directly determines the reliability of the test data of the single-point displacement meter. When the single-point displacement meter is installed upward in the surrounding rock on the top of the cavern, the grouting slurry is difficult to collect and consolidate at the anchor head, so there are problems such as difficulty in fixing the anchor head and failure to install the single-point displacement meter. Moreover, it is also difficult to use the stainless steel bar measuring rod and the anchor head to realize effective stirring and anchoring of the resin anchoring agent. In this regard, there are also attempts to set anchor flukes at the anchor head to fix the anchor head, but the actual fixing effect is often difficult to achieve satisfactory results. In addition, there is also the problem that the solenoid coil in the body of the single-point displacement gauge is difficult to be reliably fixed before the initial support shotcrete is solidified. The above problems have seriously affected the reliability of the installation of the inductance frequency modulation single-point displacement meter and the accuracy of the measurement data.

Utility model content

Aiming at the above-mentioned technical problems, the utility model provides a single-point displacement meter installation bracket and a single-point displacement measurement device to solve the problems of difficult anchoring of the anchor head of the inductance frequency-modulated single-point displacement meter and difficulty in fixing the solenoid coil of the displacement meter, ensuring The reliability of the installation of the inductance frequency modulation single-point displacement meter and the accuracy of the measurement data.

The technical scheme that the utility model adopts is as follows:

A mounting bracket for a single-point displacement meter, the single-point displacement meter includes a solenoid coil and a piston rod with relative displacement up and down, the mounting bracket includes a protective cover, a connecting cylinder and a measuring rod; There is a borehole, the measuring rod is installed in the borehole, and the upper end of the measuring rod is fixed inside the surrounding rock through a resin anchor; the connecting cylinder includes an upper part of the connecting cylinder and a lower part of the connecting cylinder that are movably connected; the upper end of the protective cover It is fixed on the surrounding rock, and the lower end is fixedly connected with the solenoid coil of the displacement meter; the upper part of the connecting cylinder is fixedly connected with the lower end of the measuring rod, and the lower part of the connecting cylinder is fixedly connected with the piston rod.

In the mounting bracket of the above-mentioned single-point displacement meter, an anchor is provided in the upper part of the connecting cylinder to realize the fixed connection between the lower end of the measuring rod and the upper part of the connecting cylinder.

In the mounting bracket of the above-mentioned single-point displacement meter, the wall-protecting steel pipe is installed inside the borehole, the measuring rod is a steel strand, and the exposed end of the measuring rod passes through the wall-protecting steel pipe and is fixed inside the surrounding rock by a resin anchoring agent. .

In the mounting bracket of the above-mentioned single-point displacement meter, the length of the exposed end of the measuring rod is 10-20cm.

In the mounting bracket of the above-mentioned single-point displacement gauge, the wall steel pipe is a whole steel pipe or several steel pipe groups connected by threads.

In the mounting bracket of the above-mentioned single-point displacement gauge, the upper part of the connecting cylinder and the lower part of the connecting cylinder are movably connected by threads.

In the mounting bracket of the above-mentioned single-point displacement meter, the upper end of the protective outer cover is fixed on the surface of the surrounding rock by expansion screws, and the lower end of the protective outer cover is fixedly connected with the solenoid coil through threads.

In the mounting bracket of the above-mentioned single-point displacement gauge, the single-point displacement gauge and the protective cover are covered with shotcrete after installation, and are connected to an external reading instrument through wires.

A single-point displacement measuring device is characterized in that it includes a single-point displacement meter and a mounting bracket, and the single-point displacement meter includes a solenoid coil and a piston rod with relative displacement up and down.

The beneficial technical effects of the utility model are as follows: when the inductance frequency-modulated single-point displacement gauge is installed on the top of the tunnel, the technical scheme of the utility model is adopted, and the uppermost end of the steel strand measuring rod can be reliably anchored at a designated position deep in the surrounding rock, At the same time, the lowest end of the steel strand measuring rod can be effectively connected with the piston rod in the displacement meter body, thus ensuring that the anchorage part, the steel strand measuring rod, and the piston rod are integrated; in addition, it can also ensure that the initial support Before the shotcrete is solidified, the solenoid coil in the body of the single-point displacement meter can be fixed on the surface of the surrounding rock, so that the solenoid coil in the body of the single-point displacement meter and the surface of the surrounding rock are deformed consistently, and the measurement read by the reading instrument The data is the accurate relative displacement between the anchorage part and the surrounding rock surface. In a word, adopting the technical scheme of the utility model can ensure the reliability of the installation of the inductance frequency modulation type single-point displacement meter and the accuracy of the measurement data.

Description of drawings

Fig. 1 is the schematic diagram of the mounting bracket of the single-point displacement meter in the utility model embodiment;

Fig. 2 is the schematic diagram that anchorage is fixed on steel strand in the utility model embodiment;

Fig. 3 is a schematic diagram of the connection between the upper part of the connecting cylinder and the lower part of the connecting cylinder in the embodiment of the present invention;

Fig. 4 is a schematic diagram of the connection between the lower part of the connecting cylinder and the piston rod of the displacement meter in the embodiment of the present invention;

Fig. 5 is the schematic diagram that protective outer cover is fixed on surrounding rock surface in the utility model embodiment;

Fig. 6 is a schematic diagram of the connection between the protective outer cover and the piston rod of the displacement meter in the embodiment of the present invention;

Reference signs: 1-solenoid coil; 2-piston rod; 3-protective cover; 4-upper connection cylinder; 5-bottom connection cylinder; 6-anchor; 7-steel strand measuring rod; 8-resin anchor ; 9-wall steel pipe; 10-surrounding rock; 11-expansion screw; 12-shotcrete; 13-reading instrument.

Detailed ways

As shown in Fig. 1-Fig. 6, the specific technical solution of the utility model is introduced below by taking the installation of the inductance frequency modulation type single-point displacement meter on the tunnel vault as an example. The single-point displacement meter includes a solenoid coil 1 with relative displacement up and down, a piston rod 2 and a reading instrument 13. The reading instrument acquires the relative displacement parameters between the solenoid coil 1 and the piston rod 2 to realize the displacement measurement of the measured target.

The utility model provides a mounting bracket for an inductance frequency modulation type single-point displacement meter, which includes a protective cover 3, a connecting cylinder and a measuring rod 7; the connecting cylinder includes a movable connecting connecting cylinder upper part 4 and a connecting cylinder lower part 5; The upper end of the above protective cover 3 is fixed on the surrounding rock 10, and the lower end is fixedly connected with the solenoid coil 1 of the displacement gauge; The piston rod 2 is fixedly connected; the surrounding rock 10 to be measured is provided with a borehole, the measuring rod 7 is installed in the borehole, and the upper end of the measuring rod 7 is fixed inside the surrounding rock 10 by a resin anchoring agent 8 .

In Fig. 2, measuring rod 7 is preferably a whole steel strand, and its upper end passes through the borehole and goes deep into surrounding rock 10, and the upper end of said steel strand measuring rod 7 and surrounding rock 10 are realized by means of said resin anchoring agent 8. Bonding and anchoring between them; the lower end of the steel strand measuring rod 7 is located outside the borehole, and the length of the exposed end of the measuring rod 7 is 12cm. The wall protection steel pipe 9 passes through the steel strand measuring rod 7 from bottom to top and is pushed into the borehole, and finally placed on the outer ring of the steel strand measuring rod 7 to support the borehole wall and avoid The steel strand measuring rod 7 is affected by the frictional resistance of the external medium and affects the accuracy of the test results of the single-point displacement meter; the wall protection steel pipe 9 can be a whole steel pipe, or can be formed by connecting steel pipes section by section through threads.

In Fig. 3-Fig. 5, the lower part 5 of the connecting cylinder is connected with the piston rod 2 in the displacement gauge body through threads; the upper part 4 of the connecting cylinder is connected with the lower part 5 of the connecting cylinder through threads; the upper part 4 of the connecting cylinder is provided with an anchor Tool 6 realizes the solid connection between the steel strand measuring rod 7 lower end and the connecting cylinder top 4. The lower end of the steel strand measuring rod 9 is effectively connected with the piston rod 2 of the displacement meter by means of the anchorage 6, the upper part 4 of the connecting cylinder and the lower part 5 of the connecting cylinder; wherein the anchorage 6 adopts a commercially available single-hole anchor The anchor tool 6 is fixed to the lower end of the steel strand measuring rod 7 through the internal wedge-shaped clip.

The upper end of the protective cover 3 is fixed on the surface of the surrounding rock 10 by means of expansion screws 11, and the lower end of the protective cover 3 is connected with the solenoid coil 1 in the displacement gauge body by threads. The single-point displacement gauge and the protective cover 3 are covered by shotcrete 12 after installation, at this time, the protective cover 3, the solenoid coil 1 in the single-point displacement gauge body and the initial support shotcrete 12 are a whole, and pass through The wire is connected with the external reading instrument 13 . The piston rod 2 in the displacement gauge body and the solenoid coil 1 in the displacement gauge body are free from each other and can move back and forth. The relative displacement between the two is the measurement result of the single-point displacement gauge. read and display.

When the inductance frequency modulation single-point displacement meter of the utility model is installed on the top of the tunnel, the technical scheme of the utility model is adopted, and the uppermost end of the steel strand measuring rod 7 can be reliably anchored at the designated position deep in the surrounding rock 10, and the steel strand The lowermost end of the line measuring rod 7 can be effectively connected with the piston rod 2 in the displacement gauge body, thereby ensuring that the anchorage part, the steel strand measuring rod 7, and the piston rod 2 are integrated; Before the shotcrete 12 is solidified, the solenoid coil 1 in the single-point displacement gauge body can be fixed on the surface of the surrounding rock 10, so that the solenoid coil 1 in the single-point displacement gauge body and the surface of the surrounding rock 10 are deformed consistently. The measurement data read by the instrument 13 is the accurate relative displacement between the anchorage position and the surface of the surrounding rock 10 . In a word, adopting the technical scheme of the utility model can ensure the reliability of the installation of the inductance frequency modulation type single-point displacement meter and the accuracy of the measurement data.

The above content is only to illustrate the technical idea of the utility model, and cannot limit the protection scope of the utility model. Any changes made on the basis of the technical solution according to the technical idea proposed by the utility model all fall into the scope of the utility model. within the scope of protection of the claims.

Claims (9)

1. The utility model provides a single point displacement meter's installing support, single point displacement meter include solenoid coil (1) and piston rod (2) of relative displacement from top to bottom, its characterized in that: comprises a protective outer cover (3), a connecting cylinder and a measuring rod (7); a drill hole is formed in the surrounding rock (10) to be tested, the measuring rod (7) is installed in the drill hole, and the upper end of the measuring rod (7) is fixed in the surrounding rock (10) through a resin anchoring agent; the upper end of the protective outer cover (3) is fixed on the surrounding rock (10), and the lower end of the protective outer cover (3) is fixedly connected with the solenoid coil (1) of the displacement meter; the connecting cylinder comprises an upper connecting cylinder part (4) and a lower connecting cylinder part (5) which are movably connected; the upper part (4) of the connecting cylinder is fixedly connected with the lower end of the measuring rod (7), and the lower part (5) of the connecting cylinder is fixedly connected with the piston rod (2).

2. The mounting bracket of the single point displacement meter of claim 1, wherein: an anchorage device (6) is arranged in the upper part (4) of the connecting cylinder, and the lower end of the measuring rod (7) is fixedly connected with the upper part (4) of the connecting cylinder.

3. The mounting bracket of the single point displacement meter of claim 1, wherein: the wall protection steel pipe (9) is installed inside the drill hole, the measuring rod (7) is a steel strand, and the measuring rod (7) penetrates through the wall protection steel pipe (9) and then is exposed at the rear end and fixed inside the surrounding rock (10) through the resin anchoring agent (8).

4. The mounting bracket of the single point displacement meter of claim 3, wherein: the length of the exposed end of the measuring rod (7) is 10-20cm.

5. The mounting bracket of the single point displacement meter of claim 3, wherein: the wall protecting steel pipe (9) is a whole steel pipe or a plurality of steel pipe groups connected by screw threads.

6. The mounting bracket of the single point displacement meter of claim 1, wherein: the upper part (4) of the connecting cylinder is movably connected with the lower part (5) of the connecting cylinder through threads.

7. The mounting bracket of the single point displacement meter of claim 1, wherein: the upper end of the protective outer cover (3) is fixed on the surface of the surrounding rock (10) through an expansion screw, and the lower end of the protective outer cover (3) is fixedly connected with the solenoid coil (1) through threads.

8. The mounting bracket of the single point displacement meter of claim 1, wherein: the single-point displacement meter and the protective outer cover (3) are arranged in the sprayed concrete (12) and are connected with an external reading instrument (13) through a lead.

9. A single point displacement measuring device, characterized by comprising a single point displacement meter and a mounting bracket according to any one of claims 1 to 8, said single point displacement meter comprising a solenoid coil (1) and a piston rod (2) which are displaced relative to each other up and down.

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