CN212903674U - Continuous monitoring device for main stress gradient of concrete dam - Google Patents
Continuous monitoring device for main stress gradient of concrete dam Download PDFInfo
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- CN212903674U CN212903674U CN202021910585.8U CN202021910585U CN212903674U CN 212903674 U CN212903674 U CN 212903674U CN 202021910585 U CN202021910585 U CN 202021910585U CN 212903674 U CN212903674 U CN 212903674U
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 27
- 238000012544 monitoring process Methods 0.000 claims abstract description 51
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- 239000004568 cement Substances 0.000 claims description 7
- 239000002861 polymer material Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 9
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- 239000010935 stainless steel Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 210000003371 toe Anatomy 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 239000011440 grout Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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Abstract
The utility model discloses a concrete dam principal stress gradient continuous monitoring device has solved the different position principal stress direction continuous variation gradient distribution of concrete dam and has lacked the monitoring means, does not have actual measured data, relies on discrete measurement station survey value to carry out the problem that the space interpolation estimated at present, also can be used to move the dam stress after the inside strainometer of dam became invalid for many years simultaneously and supply the monitoring measure. The method is characterized in that the main stress direction of key parts of the dam is analyzed according to dam stress monitoring data and structural calculation results, a geological drilling machine is adopted to drill holes on a dam body of the dam according to the main stress direction, then differential resistance type unidirectional strain gauge sensors are arranged in series in the holes according to the hole depth, and a stainless steel long rod with the same material as an equipment protection cylinder can be additionally arranged outside the equipment protection cylinder in order to improve the measurement range of the series strain gauges.
Description
Technical Field
The utility model relates to a water and electricity engineering technical field, concretely relates to concrete dam principal stress gradient continuous monitoring device.
Background
At present, the technical difficulty of various high dams and extra-high dams exceeds the existing specifications, the prior experience is lacked to be referred, certain uncertainty is brought to dam construction, and the challenge is provided for how to more effectively improve the dam safety control capability and level in the operation period. The important points of concern for the operation safety of high dams and extra-high dams include: firstly, the thrust of reservoir water borne by the dam reaches the ten-million-ton level, the bearing capacity of a dam foundation dam body structure under the condition of huge thrust, the stress distribution and gradient of key parts of the dam body and the like; secondly, the dam site is in a geological structure active area, the earthquake intensity is high, the stress of the dam body is redistributed under the action of strong earthquake loads, the deep and shallow structural surface of the dam foundation is deformed, the opening degree of the transverse seam of the dam body is equal to the opening degree of the transverse seam of the dam body; thirdly, the annual water level lifting amplitude of the high dam reservoir is large, the strength and durability of dam body materials under the loading-unloading reciprocating action, the working conditions of geological weak structures of the dam foundation and the dam abutment after reinforcement and the like are achieved; fourthly, the extra-high dam body has more orifices, large discharge fall, high flow speed, influence of long-time high-power flood discharge on the vibration of the dam body, holes of the dam body, flood discharge and energy dissipation facilities and the like. Stress is the most sensitive physical quantity reflecting dam engineering structure mechanical property, exceeding of the stress is a precursor of internal cracks or local damage of a concrete dam, exceeding of the tensile stress causes cracking of the dam body, exceeding of the shear stress causes sliding of the dam body, and local damage of the concrete dam can always find evidence in stress monitoring data, so that stress monitoring is indispensable content of dam safety evaluation.
The traditional stress monitoring instruments mainly comprise a pressure stress meter, a non-stress meter, a one-way strain meter, a multi-way strain meter group and the like, are discretely arranged on a main monitoring section and a cross section of a dam according to a design scheme and are used for monitoring the stress inside large-volume concrete, and the stress monitoring instruments do not have the function of continuously monitoring the stress distribution gradient of a dam body of the concrete dam, so that a device for continuously monitoring the stress gradient of the concrete dam is urgently needed, and abnormal changes and potential damages of key parts of the concrete dam under a complex stress working condition are found in time.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: to present concrete dam internal stress gradient only can lay measurement station survey value through the dispersion and carry out interpolation calculation conjecture, can't carry out the online measurement and acquire the problem of continuous stress gradient survey value, the utility model aims at providing a can carry out a concrete dam principal stress gradient continuous monitoring device of actual measurement to the stress gradient distribution condition of key positions such as concrete dam heel, dam toe and dam body upper portion, the device compact structure, the installation is maintained conveniently, also can be used to move the dam stress replenishment monitoring after the inside strainometer of dam became invalid for many years simultaneously.
The technical scheme is as follows: a continuous monitoring device for the main stress gradient of a concrete dam comprises a plurality of stress monitoring sensors, wherein a protective sleeve is arranged outside each stress monitoring sensor, and measuring range extending rod pieces are installed at two ends of each protective sleeve; the stress monitoring sensors are arranged in the concrete dam drilled hole in a serial connection mode, adjacent stress monitoring sensors are connected end to end through measuring range extending rod pieces at two ends of the protective sleeve, and the serial connection lengths of the stress monitoring sensors are matched with the full hole depth of the concrete dam drilled hole.
Preferably, the stress monitoring sensor is a differential resistance type unidirectional strain gauge.
Furthermore, the measuring range extension rod piece is connected with a protective sleeve outside the stress monitoring sensor in a bolting mode. Preferably, the strength and rigidity of the range extension rod and the strength and rigidity of the protective sleeve are the same.
The communication cable comprises a plurality of sensor communication branch cables and 1 monitoring communication main cable, wherein the sensor communication branch cables are correspondingly connected with each stress monitoring sensor, the other end of each sensor communication branch cable is welded with the monitoring communication main cable, namely, the signal output end of each stress monitoring sensor is welded with the monitoring communication main cable through the sensor communication branch cables, and then the monitoring communication main cable uniformly leads out an orifice of a concrete dam drilling hole; the output end of the monitoring communication main cable is connected with the automatic acquisition unit; preferably, the communication cable is a 5-core hydraulic cable.
Furthermore, backfill cement slurry is arranged in the concrete dam drilling hole. Preferably, the protective sleeve is wrapped with a flexible high polymer material pipe, and the range extension rod piece is wrapped with a hard high polymer material protective pipe for isolating the backfill cement slurry.
Compared with the prior art, the utility model discloses following beneficial effect has: the high-precision stress monitoring sensors with two bolted measuring range extending rod pieces arranged in series can better monitor the stress gradient of stress distribution parts such as the heel, toe and upper part of the dam body of the concrete dam, realize the continuous actual measurement data of the internal stress gradient distribution rule of the concrete dam, and provide a solution for really mastering the internal stress and the gradient distribution rule of mass concrete structural engineering represented by the concrete dam.
Drawings
FIG. 1 is a schematic view of a continuous monitoring device for main stress gradient of a concrete dam according to the present invention;
FIG. 2 is a schematic view of the instrument structure connection of the device for continuously monitoring the principal stress gradient of the concrete dam of the present invention;
fig. 3 is the utility model discloses a concrete dam principal stress gradient continuous monitoring device lays the schematic diagram.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the following embodiments and accompanying drawings.
As shown in fig. 1 and 2, a protective sleeve 101 is arranged outside the high-precision stress monitoring sensor 1, and measuring range extending rods 2 are mounted at two ends of the protective sleeve 101; a plurality of high-precision stress monitoring sensors 1 are arranged in a concrete dam drilling hole 4 in an end-to-end series connection mode, the sensors are arranged in the hole according to the principle of the whole hole depth of the drilling hole, and when the sensors are arranged in a series connection mode, the sensors are not directly connected and fixed, and are connected in series to form a concrete dam main stress gradient continuous monitoring device 5.
In order to further enlarge the measuring range of the sensor and reduce the number of the sensor holes for reducing the cost, the measuring range extending rod members 2 bolted to the two ends of the sensor should have the same strength and rigidity as the sensor outer side protective sleeve 101, and therefore, the measuring range extending rod members 2 and the sensor outer side protective sleeve 101 are preferably made of metal materials with the same strength and rigidity. In this embodiment, protective sleeve 101 selects to be the steel sleeve, and measuring range extension member 2 selects to be the steel member unanimous with protective sleeve 101 material, intensity and rigidity, and the steel member passes through connecting bolt 102 and the steel sleeve firm connection in the sensor outside, still is equipped with rubber packing ring 202 on measuring range extension member 2.
Furthermore, backfill cement paste 6 is poured between the concrete dam drilling hole 4 and the device, and the actual measurement of the stress gradient of the concrete dam can be carried out after the backfill cement paste 6 reaches the age. To this, high accuracy stress monitoring sensor 1's protective sleeve 101 still wraps up flexible polymer material pipe outward, and extension rod spare 2 outer parcel has stereoplasm polymer material protection tube 203 (like the PVC protection tube) to isolated grout avoids influencing the measuring result.
The monitoring signal quantity of each sensor is transmitted to an external automatic acquisition unit through a communication cable 3. Preferably, the communication cable 3 is a 5-core hydraulic cable, and is composed of 1 monitoring communication main cable and a plurality of sensor communication branch cables 301, the signal output end of each sensor is connected with the sensor communication branch cable, and the sensor communication branch cable and the communication main cable near the hole opening are welded into 5-core cables to be led out of the hole opening of the drill hole uniformly, so that the problem that the hole diameter of the drill hole is too large and the backfill grouting quality is influenced due to excessive cables in the hole is avoided.
The utility model discloses a device is in laying of concrete dam internal with the explanation of fig. 3: firstly, monitoring values through a multidirectional strain gauge group 8 arranged at a key position of a concrete dam body to calculate the main stress distribution condition of the key position of the dam body, calculating a drilling azimuth angle and an inclination angle according to a main stress direction, determining the drilling depth according to a given stress gradient monitoring range, and drilling holes in the concrete dam; according to the drilling depth, a plurality of concrete dam main stress gradient continuous monitoring devices are arranged in the holes in a series connection mode, and the series arrangement of the sensors in the holes needs to cover the whole drilling depth within a monitoring range.
In fig. 3, a drilling stress gradient monitoring device 501 arranged in the arch direction at the upper part of the dam body, a drilling stress gradient monitoring device 502 arranged in the beam direction at the middle part of the dam body, a drilling stress gradient monitoring device 503 arranged in the beam direction at the heel part of the dam, a drilling stress gradient monitoring device 504 arranged in the beam direction at the middle part of the dam, and a drilling stress gradient monitoring device 505 arranged in the beam direction at the toe part of the dam are arranged in the dam body 7 (701 is a gallery in the dam); by the aid of the continuous monitoring devices for the main stress gradients of the concrete dams, stress gradient distribution conditions of key parts such as the heels, the toes and the upper parts of dam bodies of the concrete dams can be measured actually, continuous monitoring data of the main stress gradients of all parts in the concrete dams can be acquired under conventional or emergency working conditions, the problem that the actual measurement capability of the stress distribution rule in the dams is insufficient due to a stress monitoring scheme which is distributed discretely for a long time is solved, the actual measurement sensing solution is provided for continuous changes of the stress in the concrete dams under the condition of an emergency by means of interpolation of discrete measuring point data, and the monitoring capability of the stress gradients in the concrete dams is further enhanced.
Claims (10)
1. The utility model provides a concrete dam principal stress gradient continuous monitoring device which characterized in that: the stress monitoring device comprises a plurality of stress monitoring sensors, wherein a protective sleeve is arranged outside each stress monitoring sensor, and measuring range extending rod pieces are arranged at two ends of each protective sleeve; the stress monitoring sensors are arranged in the concrete dam drilled hole in a serial connection mode, adjacent stress monitoring sensors are connected end to end through measuring range extending rod pieces at two ends of the protective sleeve, and the serial connection lengths of the stress monitoring sensors are matched with the full hole depth of the concrete dam drilled hole.
2. The continuous monitoring device of the main stress gradient of the concrete dam according to claim 1, characterized in that: the stress monitoring sensor is a differential resistance type unidirectional strain gauge.
3. The continuous monitoring device of the main stress gradient of the concrete dam according to claim 1 or 2, characterized in that: the measuring range extension rod piece is connected with the protective sleeve on the outer side of the stress monitoring sensor in a bolting mode.
4. The continuous monitoring device of the main stress gradient of the concrete dam according to claim 1 or 2, characterized in that: the strength and the rigidity of the range extension rod piece are the same as those of the protective sleeve.
5. The continuous monitoring device of the main stress gradient of the concrete dam according to claim 1, characterized in that: the monitoring communication main cable is arranged in a concrete dam drilling hole in a penetrating mode; and the signal output end of each stress monitoring sensor is welded with the monitoring communication main cable through a sensor communication branch cable, and the monitoring communication main cable uniformly leads out the hole opening of the concrete dam drilling hole.
6. The continuous monitoring device of the main stress gradient of the concrete dam according to claim 5, characterized in that: the communication cable is a 5-core hydraulic cable.
7. The continuous monitoring device of the main stress gradient of the concrete dam according to claim 5, characterized in that: and the signal output end of the monitoring communication main cable is connected with the automatic acquisition unit.
8. The continuous monitoring device of the main stress gradient of the concrete dam according to claim 1, characterized in that: and backfill cement slurry is arranged in the concrete dam drilling hole.
9. The continuous monitoring device of the main stress gradient of the concrete dam according to claim 8, characterized in that: the protective sleeve is wrapped with a flexible high polymer material pipe for isolating the backfill cement paste.
10. The continuous monitoring device of the main stress gradient of the concrete dam according to claim 8 or 9, characterized in that: the measuring range extension rod piece is wrapped by a hard polymer material protection pipe for isolating the backfill cement paste.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021910585.8U CN212903674U (en) | 2020-09-04 | 2020-09-04 | Continuous monitoring device for main stress gradient of concrete dam |
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| CN202021910585.8U CN212903674U (en) | 2020-09-04 | 2020-09-04 | Continuous monitoring device for main stress gradient of concrete dam |
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| CN212903674U true CN212903674U (en) | 2021-04-06 |
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| CN202021910585.8U Active CN212903674U (en) | 2020-09-04 | 2020-09-04 | Continuous monitoring device for main stress gradient of concrete dam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2030211A (en) * | 2020-12-23 | 2022-07-19 | Huaneng Group Tech Innovation Center Co Ltd | Method for monitoring stress gradient of concrete dam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2030211A (en) * | 2020-12-23 | 2022-07-19 | Huaneng Group Tech Innovation Center Co Ltd | Method for monitoring stress gradient of concrete dam |
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