CN209841245U - A Vibrating Wire Earth Pressure Gauge with Deviation Correction Function - Google Patents

Abstract

The utility model relates to the field of geotechnical engineering monitoring, in particular to a vibrating wire earth pressure gauge with a deviation correction function. It includes a shell, and a steel string and a deviation correction mechanism are arranged in the shell; one end of the steel string is fixed on the wire clamping bolt, and the other end is compacted and fixed by a locking mechanism arranged on the annular casing and opposite to the wire clamping bolt; The deviation correction mechanism includes iron cores fixed on the inner center of the upper end cover and the lower end cover respectively, and coils respectively wound on the iron cores. The utility model can overcome the shortcomings of the existing vibrating wire earth pressure gauges that the measurement accuracy is insufficient, the steel strings cannot be replaced and the tension cannot be adjusted.

Description

A Vibrating Wire Earth Pressure Gauge with Deviation Correction Function

technical field

The utility model relates to the field of geotechnical engineering monitoring, in particular to a vibrating wire earth pressure gauge with a deviation correction function.

Background technique

With the rapid development of urban infrastructure construction, there are more and more projects such as high-rise building construction, subway construction, and slope management. The foundation of this type of project is deep and large, and the contact pressure between it and the rock and soil mass is related to the stratum settlement, which affects the construction and use safety of the project. Therefore, it is very necessary to monitor the earth pressure on the contact surface between concrete, rock and other rigid buildings and soil. Through the monitoring of contact earth pressure, the magnitude, distribution and variation law of earth pressure on rigid buildings can be known, which can provide a basis for building design, maintenance and repair.

At present, the sensor that measures the pressure on the contact surface between rock or concrete and soil is an earth pressure gauge. Commonly used earth pressure gauges include resistance strain earth pressure gauges, vibrating wire earth pressure gauges, and the like. The vibrating wire earth pressure gauge uses the frequency as the output signal, and has the advantages of strong anti-interference ability and minimal error caused by long-distance transmission. The working principle of the vibrating wire earth pressure gauge is that when the soil stress in the measured structure changes, the earth pressure gauge induction plate will sense the change of stress synchronously, and the induction plate will be deformed, and the deformation will be transmitted to the vibrating wire and transformed into a vibrating wire. Changes in stress, thereby changing the vibration frequency of the vibrating wire. The electromagnetic coil excites the vibrating wire and measures its vibration frequency. The frequency signal is transmitted to the reading device through the cable, and the compressive stress value of the measured structure can be measured.

It should be pointed out that the working environment of the earth pressure gauge is very bad, and the measurement deviation and the failure of the steel string are often caused by improper installation, so that the earth pressure gauge cannot play a role in detection.

Utility model content

The utility model aims to provide a vibrating wire earth pressure gauge with a deviation correction function, which can correct the earth pressure measurement deviation and the steel strings can be replaced or adjusted. It overcomes the shortcomings of the existing vibrating wire earth pressure gauge that the measurement accuracy is insufficient, the steel string cannot be replaced and the tension cannot be adjusted.

In order to solve the above technical problems, the technical scheme adopted by the present utility model is: a vibrating wire earth pressure gauge with a deviation correction function, comprising a shell, and a steel string and a steel string for exciting the steel string and obtaining the steel string are arranged in the shell. The vibration frequency of the string is used to correct the deviation correction mechanism of the monitoring value of the earth pressure; the shell includes an annular casing and an upper end cover and a lower end cover fixed at both ends of the annular casing; one end of the steel string is fixed on the clamping bolt, and the clamping bolt is installed In the first threaded hole opened on the annular casing, the other end of the steel string is compacted and fixed by a locking mechanism arranged on the annular casing and opposite to the wire clamping bolt. The locking mechanism includes a compression bolt, a spring and a steel ball. , a second threaded hole and a conical hole are sequentially opened on the annular casing along the direction from the outside to the inside, and the small end of the conical hole is communicated with the inner cavity of the casing so that the steel chord can pass through the casing through the small end of the conical hole. Outside the body, the compression bolt is fitted in the second threaded hole and has a central through hole for the steel chord to pass through, the steel ball is fitted in the tapered hole, and the spring is arranged between the compression bolt and the steel ball and used for It cooperates with the pressing bolt to press the steel ball tightly on the wall of the conical hole; the deviation correction mechanism includes an iron core fixed at the inner center of the upper end cover and the lower end cover respectively, and coils respectively wound on the iron core, in the annular shell The upper part is provided with a perforation for the cable to penetrate into the inner cavity of the casing to supply power to the coil.

Preferably, the steel chords are distributed along the radial direction of the casing, and both cables are orthogonally distributed on the steel chords.

Preferably, the two iron cores are respectively bonded and fixed on the upper end cap and the lower end cap by using an insulating adhesive.

Preferably, the shell is made of steel material.

Preferably, both the pressing bolt and the thread clamping bolt are countersunk head in-line bolts, and a slit for clamping and fixing the steel chord is provided at the end position of the thread clamping bolt.

Preferably, the perforation is provided with a hollow sealing plug made of rubber material, the inner hole of the sealing plug is in interference fit with the cable, and the outer circumference of the sealing plug is provided with an expansion strip that cooperates and seals with the inner wall of the perforation.

beneficial effect

The utility model provides a vibrating wire earth pressure gauge with a deviation correction function. When monitoring the earth pressure, a reader is used to obtain the vibration frequencies of the vibrating wires excited by two sets of coils respectively. The value is taken as the final output frequency; when the difference between the two groups of data is large, it indicates that the installation of the earth pressure gauge fails. Thereby, the deviation of the chord-type earth pressure gauge is corrected and the measurement accuracy is improved.

At the same time, the earth pressure gauge has the advantages of steel string replacement and adjustable tension, which improves the service life and adaptability of the earth pressure gauge.

Description of drawings

Fig. 1 is the front sectional view of the utility model;

Fig. 2 is the enlarged structural representation of part A in Fig. 1;

Fig. 3 is the side sectional view of the utility model;

Fig. 4 is the enlarged structural representation of part B in Fig. 3;

Markings in the figure: 1. Upper end cap, 2. Coil, 3. Iron core, 4. Steel string, 5. Locking mechanism, 501, Compression bolt, 502, Spring, 503, Steel ball, 6. Lower end cap, 7 , Ring housing, 8, clamping bolt, 9, sealing plug, 10, cable, 11, expansion strip.

Detailed ways

As shown in Figures 1 and 3, a vibrating wire earth pressure gauge with a deviation correction function of the present invention includes a pie-shaped shell, a steel string 4 arranged in the inner cavity of the shell, and a deviation correction mechanism. The casing includes an annular casing 7 and an upper end cover 1 and a lower end cover 6 respectively fixed at both ends of the annular casing 7 by screws. When the earth pressure gauge is working, the steel string 4 can be excited by the deviation correction mechanism and its vibration frequency can be obtained, so as to realize the correction of the earth pressure monitoring value.

The deviation correction mechanism includes an iron core 3 fixed at the inner center position of the upper end cover 1 and the lower end cover 6 respectively, and a coil 2 wound on the iron core 3 respectively. Perforation to supply power to coil 2. When monitoring the earth pressure, use the reader to obtain the vibration frequency of the vibrating wire excited by the two sets of coils 2 respectively. When the two sets of test data are close, the average value is used as the final output frequency; when the two sets of data are significantly different, it indicates that the earth pressure The meter installation fails.

The shell in this embodiment is made of steel material, and the two iron cores 3 are respectively bonded and fixed on the upper end cover 1 and the lower end cover 6 by insulating AB glue. The perforation is provided with a hollow sealing plug 9 made of rubber material. The inner hole of the sealing plug 9 is in an interference fit with the cable 10. The outer periphery of the sealing plug 9 is provided with an expansion strip 11 in the circumferential direction. After being inserted into the inner hole of the plug 9, the expansion strip 11 expands and cooperates with the inner wall of the hole to seal the hole.

The wire clamping bolt 8 is a slot-shaped countersunk head bolt and is fitted in the first bolt hole opened on the annular housing 7 , and a slit for clamping and fixing the steel chord 4 is formed at the end of the clamping bolt 8 . The steel chords 4 are distributed along the radial direction of the housing, and the two cables 10 are orthogonally distributed on the steel chords 4. One end of the steel chords 4 is fixed in the slit of the clamping bolt 8, and the other end is arranged on the annular housing 7 and The locking mechanism 5 opposite to the thread tensioning bolt 8 is compacted and fixed. The locking mechanism 5 includes a pressing bolt 501 , a spring 502 and a steel ball 503 , which can realize tension adjustment and replacement of the steel string 4 . A second threaded hole and a tapered hole are sequentially opened on the annular housing 7 along the direction from the outside to the inside. The small end of the tapered hole communicates with the inner cavity of the housing so that the steel chord 4 can pass through the small end of the tapered hole. Outside the housing, the pressing bolt 501 is fitted in the second threaded hole and has a central through hole for the steel chord 4 to pass through, the steel ball 503 is fitted in the tapered hole, and the spring 502 is arranged on the pressing bolt 501 and the The steel balls 503 are used to cooperate with the pressing bolts 501 to press the steel balls 503 on the wall of the tapered hole.

The operation method of installing or replacing the steel string 4 is as follows: a. Insert the steel string 4 wire through the second threaded hole and the tapered hole on the side of the compression bolt 501 into the inner cavity of the shell, and from the first thread on the side of the clamping bolt 8 B. Press the steel string 4 into the slit of the head of the thread clamping bolt 8, and tighten the thread clamping bolt 8 in the first threaded hole; The ball 503, the spring 502 and the compression bolt 501, use the tensioner to pull the steel string 4 to make the steel string 4 reach the specified stress; d screw the compression bolt 501 and use the steel ball 503 to press and fix the steel string 4 on the tapered In the hole, the installation of the steel string 4 is completed.

The operation method of stress adjustment of the steel string 4 is: loosen the compression bolt 501, adjust the tension of the steel string 4 by pulling the steel string 4 through the tensioner, and then tighten the compression bolt 501 after adjustment, re-fix the steel string 4 and realize the steel string 4. 4 Stress changes.

Claims (6)

1. The utility model provides a vibrating wire formula soil pressure gauge with deviation function of rectifying which characterized in that: the soil pressure monitoring device comprises a shell, wherein a steel string (4) and a deviation correcting mechanism for exciting the steel string (4) and acquiring the vibration frequency of the steel string (4) to correct a soil pressure monitoring value are arranged in the shell; the shell comprises an annular shell (7), an upper end cover (1) and a lower end cover (6), wherein the upper end cover and the lower end cover are fixed at two ends of the annular shell (7); one end of a steel string (4) is fixed on a wire clamping bolt (8), the wire clamping bolt (8) is installed in a first threaded hole formed in an annular shell (7) in a matched mode, the other end of the steel string (4) is compacted and fixed through a locking mechanism (5) which is arranged on the annular shell (7) and is opposite to the wire clamping bolt (8), the locking mechanism (5) comprises a pressing bolt (501), a spring (502) and a steel ball (503), a second threaded hole and a conical hole are sequentially formed in the annular shell (7) from outside to inside, the small end of the conical hole is communicated with an inner cavity of the shell, so that the steel string (4) can penetrate through the outer portion of the shell from the small end of the conical hole, the pressing bolt (501) is installed in the second threaded hole in a matched mode and is provided with a central through hole through which the steel string (4) penetrates, the steel ball (503) is installed in the conical hole in a matched mode, and the spring (502) is arranged between the pressing bolt (501) and the steel ball (503) and used for being matched with Tightly pressing on the wall of the conical hole; deviation corrects mechanism including fixing iron core (3) that upper end cover (1) and lower extreme cover (6) inboard central point put respectively and around establishing coil (2) on iron core (3) respectively, has seted up on annular shell (7) and has penetrated the perforation that the casing inner chamber was penetrated in order to supply power to coil (2) power supply cable (10).

2. The vibrating wire type earth pressure gauge with deviation correcting function according to claim 1, wherein: the steel strings (4) are distributed along the radial direction of the shell, and the two cables (10) are both distributed on the steel strings (4) in an orthogonal mode.

3. The vibrating wire type earth pressure gauge with deviation correcting function according to claim 1, wherein: the two iron cores (3) are respectively bonded and fixed on the upper end cover (1) and the lower end cover (6) by adopting insulated adhesive.

4. The vibrating wire type earth pressure gauge with deviation correcting function according to claim 1, wherein: the shell is made of steel materials.

5. The vibrating wire type earth pressure gauge with deviation correcting function according to claim 1, wherein: the compression bolt (501) and the wire clamping bolt (8) are both countersunk straight bolts, and a cutting seam for clamping and fixing the steel string (4) is arranged at the end position of the wire clamping bolt (8).

6. The vibrating wire type earth pressure gauge with deviation correcting function according to claim 1, wherein: be equipped with in the perforation and adopt rubber materials preparation and hollow sealing plug (9), the hole and cable (10) interference fit of sealing plug (9), the periphery of sealing plug (9) is equipped with along the hoop and perforates the sealed expansion strip (11) of inner wall cooperation.