CN215052834U - A pore water pressure monitoring devices for tunnel exit barricade bank protection - Google Patents
A pore water pressure monitoring devices for tunnel exit barricade bank protection Download PDFInfo
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- CN215052834U CN215052834U CN202122289589.XU CN202122289589U CN215052834U CN 215052834 U CN215052834 U CN 215052834U CN 202122289589 U CN202122289589 U CN 202122289589U CN 215052834 U CN215052834 U CN 215052834U
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Abstract
The utility model provides a pore water pressure monitoring device for tunnel exit retaining wall revetment, which comprises a first monitoring unit and a second monitoring unit which are connected in series up and down; the first monitoring unit and the second monitoring unit comprise sensors, connecting pieces and water permeable pieces; the sensor includes sensor housing and sensor core, and the sensor core includes: the sensor comprises a pressure bearing film at the bottom of a sensor shell, a coil arranged along the circumferential direction of the sensor shell and a vibrating wire arranged along the axial direction of the sensor shell; one end of the vibrating wire is fixedly connected with the top of the sensor shell, and the other end of the vibrating wire is fixedly connected with the pressure-bearing membrane; the connecting piece is arranged at the bottom of the sensor shell and connected with the water permeable piece, and the inside of the connecting piece is hollow; the inside of the permeable piece is provided with a pressure bearing cavity so that the pressure of pore water acts on the pressure bearing film; the permeable piece of the first monitoring unit is connected with the sensor shell of the second monitoring unit, and the second monitoring unit are used for monitoring the pore water pressure of a buried point at the same time.
Description
Technical Field
The utility model relates to an engineering detection area especially relates to a pore water pressure monitoring devices for tunnel exit barricade bank protection.
Background
The pore water pressure monitoring refers to the measurement of the water pressure and the change in the soil particle pore space of the earth-rock dam body or foundation under the action of factors such as soil consolidation, foundation deformation and water flow permeation. Due to the functions of the monitoring equipment, in the monitoring of the pore water pressure, the pore water pressure in the process of gradually draining and consolidating the saturated soil body from the construction stage to the initial stage of operation of the earth-rock dam and the comprehensive water pressure formed by compression and infiltration in the initial stage of water storage can be measured, and the seepage water pressure formed by the infiltration of the dam body in the operational stage of the water storage and the pore water pressure generated in the earth-rock dam due to the sudden drop of the upstream water level can also be measured.
For the retaining wall revetment at the exit of the tunnel, the increase of the pore water pressure often causes the instability of the retaining wall revetment. Monitoring the pore water pressure, checking the stability of the retaining wall protection slope at any time during construction, controlling the filling speed and ensuring safe construction; seepage and stable conditions of the retaining wall protection slope can be analyzed at any time during railway operation, and safe application is guaranteed.
In engineering, two kinds of pore water pressure gauges, namely a steel wire type pore water pressure gauge and a differential resistance type pore water pressure gauge, are mainly used, and a vibrating wire type pore water pressure gauge is widely applied due to the fact that the vibrating wire type pore water pressure gauge has an intelligent recognition function, but a conventional single vibrating wire type pore water pressure gauge does not generally have a multi-point detection function. If the value of the vibrating wire type pore water pressure gauge at a certain buried point is abnormal, whether the vibrating wire type pore water pressure gauge is damaged or the true pore water pressure is abnormal cannot be judged.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a pore water pressure monitoring device for tunnel exit retaining wall slope protection to eliminate or improve one or more defects existing in the prior art.
The technical scheme of the utility model as follows:
the pore water pressure monitoring device comprises a first monitoring unit and a second monitoring unit which are connected in series up and down;
the first monitoring unit and the second monitoring unit comprise sensors, connecting pieces and water permeable pieces;
the sensor includes a sensor housing and a sensor core mounted inside the sensor housing, the sensor core including: the sensor comprises a pressure bearing film at the bottom of the sensor shell, a coil arranged along the circumferential direction of the sensor shell and a vibrating wire arranged along the axial direction of the sensor shell; one end of the vibrating wire is fixedly connected with the top of the sensor shell, and the other end of the vibrating wire is fixedly connected with the pressure-bearing membrane;
the connecting piece is arranged at the bottom of the sensor shell and connected with the water permeable piece, and the connecting piece is hollow; the pressure-bearing cavity is communicated with the pressure-bearing film so that the pressure of the pore water acts on the pressure-bearing film;
the permeable piece of the first monitoring unit is connected with the sensor shell of the second monitoring unit, and the second monitoring unit are used for monitoring the pore water pressure of a buried point at the same time.
In some embodiments, the water permeable member of the monitoring unit comprises a rigid skeleton and a water permeable material mounted on the rigid skeleton.
In some embodiments, the sensor housings of the first and second monitoring units are threaded with a coupling that is threaded with a water permeable member.
In some embodiments, the water permeable member of the first monitoring unit is threadedly connected with the sensor housing of the second monitoring unit.
In some embodiments, a top cover is disposed on a top portion of the sensor housing of the first monitoring unit, and the signal lines of the first monitoring unit and the second monitoring unit extend out from a top surface of the top cover.
In some embodiments, the bottom of the permeable member of the second monitoring unit is provided with a bottom cone, and the bottom cone is in threaded connection with the permeable member of the second monitoring unit.
In some embodiments, the vibrating wire is a steel wire, and one end of the steel wire is connected to the central part of the pressure bearing film.
In some embodiments, the pore water pressure monitoring device comprises a plurality of first monitoring units and/or second monitoring units which are connected in series.
According to the utility model discloses a pore water pressure monitoring devices for tunnel exit barricade bank protection, obtainable beneficial effect includes at least: this pore water pressure monitoring devices has arranged two or more monitoring unit simultaneously, and each monitoring unit can realize this multiple spot monitoring of burying point infiltration (pore) water pressure, for obtaining more accurate pore water pressure information, can carry out post processing, for example weighted average etc. to each monitoring unit's monitoring data. If the difference value between the monitoring data of one monitoring unit and the monitoring data of other monitoring units is large, the abnormal value can be eliminated so as not to influence the accuracy of the whole monitoring system.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present invention are not limited to the details set forth above, and that these and other objects that can be achieved with the present invention will be more clearly understood from the following detailed description.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. For convenience in illustrating and describing some portions of the present invention, corresponding parts of the drawings may be exaggerated, i.e., may be larger, relative to other components in an exemplary device actually manufactured according to the present invention. In the drawings:
fig. 1 is a schematic structural diagram of a pore water pressure monitoring device according to an embodiment of the present invention.
Reference numerals:
1. a first monitoring unit; 11. a sensor; 11a, a sensor housing; 11b, a sensor core body; 111. a coil; 112. vibrating wire; 113. bearing the pressure; 12. a coupling member; 13. a water permeable member; 131. a pressure-bearing cavity; 14. a top cover; 2. a second monitoring unit; 24. a bottom cone;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
It should also be noted that, in order to avoid obscuring the invention with unnecessary details, only the structures and/or process steps that are closely related to the solution according to the invention are shown in the drawings, while other details that are not relevant to the invention are omitted.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.
It is also noted herein that the term "coupled," if not specifically stated, may refer herein to not only a direct connection, but also an indirect connection in which an intermediate is present.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar parts, or the same or similar steps.
The utility model provides a pore water pressure monitoring devices for tunnel exit barricade bank protection to realize the multiple spot measurement of same monitoring position and get rid of the unusual influence of the single vibration wire formula pore water pressure gauge trouble among the prior art.
As shown in fig. 1, in some embodiments, the pore water pressure monitoring device includes a first monitoring unit 1 and a second monitoring unit 2 connected in series. The first and second monitoring units 1, 2 comprise a sensor 11, a coupling member 12 and a water permeable member 13. The permeable piece 13 of the first monitoring unit 1 is connected with the shell of the sensor 11 of the second monitoring unit 2, and the second monitoring unit 2 are used for monitoring the pore water pressure of a buried point at the same time.
In this embodiment, the pore water pressure monitoring device is simultaneously provided with two or more monitoring units, each monitoring unit can realize multi-point monitoring of the buried site infiltration (pore) water pressure, and in order to obtain more accurate pore water pressure information, the monitoring data of each monitoring unit can be post-processed, such as weighted average and the like. If the difference value between the monitoring data of one monitoring unit and the monitoring data of other monitoring units is large, the abnormal value can be eliminated so as not to influence the accuracy of the whole monitoring system; in addition, the monitoring units of the pore water pressure monitoring device are arranged in sections, the assembly mode is flexible, and the number can be determined according to actual requirements.
In some embodiments, the sensor 11 includes a sensor housing 11a and a sensor core 11b mounted inside the sensor housing 11a, the sensor core 11b including: a pressure-bearing membrane 113 at the bottom of the sensor 11 housing, a coil 111 arranged along the circumferential direction of the sensor 11 housing, and a vibrating wire 112 arranged along the axial direction of the sensor 11 housing; one end of the vibrating wire 112 is fixedly connected with the top of the shell of the sensor 11, and the other end is fixedly connected with the pressure bearing film 113.
In some embodiments, the connector is mounted at the bottom of the housing of the sensor 11 and is connected with the water permeable member 13, and the interior of the connector is hollow; the inside of the permeable member 13 has a pressure-bearing chamber 131, so that the pore water can be collected after passing through the permeable member 13, and the pressure-bearing chamber 131 is communicated with the pressure-bearing membrane 113, so that the pressure of the pore water acts on the pressure-bearing membrane 113.
When the pore water pressure monitoring device is buried in a soil body, pressure water is collected to the pressure bearing cavity 131 through the water permeable piece 13 and acts on the pressure bearing membrane 113, deflection is generated in the center of the membrane to cause the stress of the vibrating wire 112 to change, and the natural vibration frequency of the vibrating wire 112 changes accordingly. A circumferentially annularly arranged electromagnetic coil 111 is used to excite the vibrating wire 112 and measure its vibration period. The vibration period is sensitive to the pressure applied on the pressure-bearing membrane 113, and the pressure value acting on the pressure-bearing membrane 113 can be converted by using the calibration coefficient by measuring the vibration period of the vibrating wire 112, so that the measurement of the pore water pressure is realized. The frequency value of the sensor 11 is converted into the pore water pressure by equation (1).
K (f0-fi) equation (1)
Wherein:
p is the pore water pressure;
k is the calibration coefficient of the measured pore water pressure monitoring device;
fi is the average frequency value of the pore water pressure gauge during measurement;
f0 is the average of the initial frequencies measured for the pore water pressure gauge prior to installation.
In some embodiments, the water permeable member 13 of the first monitoring unit 1 comprises a rigid skeleton and a water permeable material mounted on the rigid skeleton. The permeable member 13 may be a permeable stone with high or low air permeability to protect the pressure bearing membrane 113 from solid particles, thereby sensing only the pressure of the fluid to be measured. In the saturated condition, the permeable stone is easier to take down and replace.
In some embodiments, the sensor 11 housings of the first and second monitoring units 1, 2 are threaded with a coupling 12, the coupling 12 being threaded with a water permeable member 13. Further, the water permeable member 13 of the first monitoring unit 1 is in threaded connection with the housing of the sensor 11 of the second monitoring unit 2, so that the first monitoring unit 1 and the second monitoring unit 2 can be conveniently assembled.
In some embodiments, a top cover 14 is disposed on the top of the housing of the sensor 11 of the first monitoring unit 1, and the signal lines of the first monitoring unit 1 and the second monitoring unit 2 extend from the top surface of the top cover 14.
In some embodiments, the bottom of the water permeable member 13 of the second monitoring unit 2 is provided with a bottom cone 24, and the bottom cone 24 is screwed with the water permeable member 13 of the second monitoring unit 2. The bottom cone 24 facilitates the entry of the entire device into the hole in which the buried point is located.
In some embodiments, the vibrating wire 112 is a steel wire, and one end of the steel wire is connected to the central portion of the pressure bearing membrane 113, so that the amplitude and frequency of the steel wire are large and stable, and the measurement is convenient.
In some embodiments, the pore water pressure monitoring device comprises a plurality of first monitoring units 1 and/or second monitoring units 2 which are connected in series. The monitoring units of the pore water pressure monitoring device are arranged in sections, the assembly mode is flexible, and the number can be determined according to actual requirements.
The utility model discloses pore water pressure monitoring devices not only can be used to the pore water pressure monitoring of tunnel export barricade bank protection, also can be used to other civil engineering, like water conservancy dam body and bridge basic unit etc..
According to the utility model discloses a pore water pressure monitoring devices for tunnel exit barricade bank protection, obtainable beneficial effect includes at least:
(1) this pore water pressure monitoring devices has arranged two or more monitoring unit simultaneously, and each monitoring unit can realize this multiple spot monitoring of burying point infiltration (pore) water pressure, for obtaining more accurate pore water pressure information, can carry out post processing, for example weighted average etc. to each monitoring unit's monitoring data. If the difference value between the monitoring data of one monitoring unit and the monitoring data of other monitoring units is large, the abnormal value can be eliminated so as not to influence the accuracy of the whole monitoring system.
(2) The monitoring units of the pore water pressure monitoring device are arranged in sections, the assembly mode is flexible, and the number can be determined according to actual requirements.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A pore water pressure monitoring device for tunnel exit retaining wall revetment is characterized by comprising a first monitoring unit and a second monitoring unit which are connected in series up and down;
the first monitoring unit and the second monitoring unit comprise sensors, connecting pieces and water permeable pieces;
the sensor includes a sensor housing and a sensor core mounted inside the sensor housing, the sensor core including: the sensor comprises a pressure bearing film at the bottom of the sensor shell, a coil arranged along the circumferential direction of the sensor shell and a vibrating wire arranged along the axial direction of the sensor shell; one end of the vibrating wire is fixedly connected with the top of the sensor shell, and the other end of the vibrating wire is fixedly connected with the pressure-bearing membrane;
the connecting piece is arranged at the bottom of the sensor shell and connected with the water permeable piece, and the connecting piece is hollow; the pressure-bearing cavity is communicated with the pressure-bearing film so that the pressure of the pore water acts on the pressure-bearing film;
the permeable piece of the first monitoring unit is connected with the sensor shell of the second monitoring unit, and the second monitoring unit are used for monitoring the pore water pressure of a buried point at the same time.
2. The pore water pressure monitoring device for tunnel exit retaining wall revetment according to claim 1, wherein the water permeable member of the first monitoring unit comprises a hard skeleton and a water permeable material mounted on the hard skeleton.
3. The pore water pressure monitoring device for tunnel exit retaining wall revetment according to claim 2, wherein the sensor housings of the first and second monitoring units are in threaded connection with a coupling member, and the coupling member is in threaded connection with a water permeable member.
4. The pore water pressure monitoring device for tunnel exit retaining wall revetment according to claim 3, wherein the water permeable member of the first monitoring unit is in threaded connection with the sensor housing of the second monitoring unit.
5. The pore water pressure monitoring device for tunnel exit retaining wall revetment according to claim 1, wherein a top cover is disposed on a top of the sensor housing of the first monitoring unit, and signal lines of the first and second monitoring units extend from a top surface of the top cover.
6. The pore water pressure monitoring device for tunnel exit retaining wall revetment according to claim 1, wherein a bottom cone is provided at the bottom of the permeable member of the second monitoring unit, and the bottom cone is in threaded connection with the permeable member of the second monitoring unit.
7. The pore water pressure monitoring device for tunnel exit retaining wall revetment according to claim 1, wherein said vibrating wire is a steel wire, one end of which is connected to the center of said pressure-bearing membrane.
8. The pore water pressure monitoring device for tunnel exit retaining wall revetment according to claim 1, wherein the pore water pressure monitoring device comprises a plurality of first monitoring units and/or second monitoring units connected in series up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122289589.XU CN215052834U (en) | 2021-09-22 | 2021-09-22 | A pore water pressure monitoring devices for tunnel exit barricade bank protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122289589.XU CN215052834U (en) | 2021-09-22 | 2021-09-22 | A pore water pressure monitoring devices for tunnel exit barricade bank protection |
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| CN215052834U true CN215052834U (en) | 2021-12-07 |
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| CN202122289589.XU Active CN215052834U (en) | 2021-09-22 | 2021-09-22 | A pore water pressure monitoring devices for tunnel exit barricade bank protection |
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