CN110864839A - Internal stress monitoring device for cement concrete pavement slab and using method thereof - Google Patents
Internal stress monitoring device for cement concrete pavement slab and using method thereof Download PDFInfo
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- CN110864839A CN110864839A CN201911414147.4A CN201911414147A CN110864839A CN 110864839 A CN110864839 A CN 110864839A CN 201911414147 A CN201911414147 A CN 201911414147A CN 110864839 A CN110864839 A CN 110864839A
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- 239000004567 concrete Substances 0.000 title claims abstract description 105
- 239000004568 cement Substances 0.000 title claims abstract description 33
- 238000012806 monitoring device Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000013013 elastic material Substances 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract 1
- 230000003014 reinforcing effect Effects 0.000 description 9
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000005483 Hooke's law Effects 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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Abstract
The invention relates to an internal stress monitoring device of a cement concrete pavement slab and a using method thereof. Before the cement pavement slab is poured, the device is placed at a position to be tested, and in the concrete hardening and service process, the concrete internal stress at the tested position can be calculated and obtained by combining the reading of the vibrating string type steel bar stressometer with the area of the flange plate. The device does not need to convert any intermediate data, can truly reflect the true value of the concrete stress of the pavement slab from pouring maintenance to mature service period, and has the advantages of simple and convenient operation, low manufacturing cost and high practical value.
Description
Technical Field
The invention relates to an internal stress monitoring device for a cement concrete pavement slab and a using method thereof.
Background
Research shows that in the construction stage, due to the comprehensive action of specific uneven temperature and humidity fields, cement hydration, boundary conditions and self-weight constraint, initial internal stress can be formed on the pavement slab, and the initial internal stress, which has the combined action with the environmental field and traffic load in the service stage, can generate obvious and complex influence on the mechanical behavior and the failure mode of the pavement slab, and even can directly induce the premature slab breaking of the pavement slab. The method is very important for directly monitoring the internal stress of the cement concrete pavement slab. In the past, a bottleneck exists in the direct monitoring technology of the internal stress of the concrete pavement slab, and many researchers adopt a saw-cut method and a drill collar method to reversely calculate to obtain the internal stress of the concrete pavement slab. In addition, people monitor the deformation of the panel through a strain sensor, simultaneously monitor other material parameters, and strip the influence of temperature, humidity and volume deformation based on Hooke's law and a creep relaxation related model to calculate the stress of the panel.
Therefore, an internal stress monitoring device for a cement concrete pavement slab is needed.
Disclosure of Invention
The invention aims to provide an internal stress monitoring device for a cement concrete pavement slab and a using method thereof.
The technical scheme of the invention is as follows: the utility model provides a cement concrete pavement slab internal stress monitoring devices, includes the PVC drum, the concrete has been pour to the left side inner chamber of PVC drum, and the right side inner chamber of PVC drum is provided with rather than sliding fit's survey stress device, survey the stress device and be connected with the concrete of left inner chamber.
Furthermore, the stress measuring device comprises a concrete column, elastic pads are arranged at two ends of the concrete respectively, a vibrating string type steel bar stress meter is transversely arranged in the concrete column, two ends of the vibrating string type steel bar stress meter are connected with an outward extending force transmission rod piece penetrating through the elastic pads respectively, and the other end of the outward extending force transmission rod piece is correspondingly connected with a flange plate used for being connected with concrete in the inner cavity of the left side or concrete in the pavement of the right side.
Furthermore, the left end and the right end of the vibrating wire type steel bar stress gauge are respectively provided with an inner concave notch with threads, the outward extending force transmission rod piece is a steel bar with one end provided with threads and connected with the inner concave notch, and the other end of the steel bar is welded at the center of the flange plate.
Furthermore, the overhanging length of the reinforcing steel bar is 5mm and penetrates through an elastic pad, and the elastic pad is an elastic rubber pad with the thickness of 5mm and the outer diameter of 100 mm; the thickness of ring flange is 5mm, and the diameter is 100 mm.
Furthermore, T-shaped twisted steel bars anchored with concrete in the inner cavity of the left side or concrete in the pavement of the right side are welded on the flange plates respectively.
Furthermore, a stress meter data line penetrating through the concrete column, the PVC cylinder and the pavement concrete is arranged on the vibrating wire type steel bar stress meter.
Further, the left end of PVC drum is provided with seals the apron, it is provided with screw thread I-shaped reinforcing bar to seal the apron, the one end of screw thread I-shaped reinforcing bar is located the concrete of left side inner chamber, and the other end of screw thread I-shaped reinforcing bar is used for being connected with left side road surface concrete.
Furthermore, through holes are densely distributed on the surface of the PVC cylinder, the inner wall of the PVC cylinder is provided with an elastic material which is favorable for free radial deformation of concrete in the left inner cavity, and a plastic film is arranged at the connecting part between the PVC cylinder and the stress measuring device.
Further, the PVC cylinder is 500mm long and 105mm in diameter; the diameter of the through hole is 5 mm; the thickness of the elastic material is 3 mm.
A use method of an internal stress monitoring device of a cement concrete pavement slab comprises the following steps:
1) before the cement pavement slab is poured, an internal stress monitoring device of the cement concrete pavement slab is placed at a position to be tested;
2) pouring concrete into the left inner cavity of the PVC cylinder while pouring the cement pavement slab, so that the growth age of the concrete in the left inner cavity is consistent with that of the pavement concrete, and enabling a stress meter data line of the vibrating string type steel bar stress meter to penetrate out of the pavement concrete;
3) and calculating to obtain the concrete internal stress of the measured position by combining the reading of the vibrating wire type steel bar stress meter and the area of the flange plate.
Compared with the prior art, the invention has the following advantages: through a plurality of preliminary experiments, the device for monitoring the internal stress of the cement concrete pavement slab does not need performance parameters of other materials of concrete, does not need any intermediate data conversion, can accurately and truly and directly measure the internal transverse stress state of the cement pavement slab, and has the advantages of simple and convenient operation, low manufacturing cost and high practical value; meanwhile, the design is ingenious, the precision is high, the real stress value of the concrete panel in the early age period can be disclosed, and theoretical and technical support is provided for subsequent pavement mechanics behavior analysis design and construction process decision.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: the method comprises the following steps of 1-vibrating string type steel bar stressometer, 2-flange plate, 3-PVC cylinder, 4-overhanging force transmission rod piece, 5-T type steel bar, 6-elastic pad, 7-stressometer data line, 8-precast concrete column, 9-sealing cover plate, 10-threaded I-shaped steel bar, 11-elastic material and 12-concrete in left cavity.
Detailed Description
In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.
Refer to FIG. 1
The utility model provides a cement concrete pavement slab internal stress monitoring devices for the stress of monitoring cement concrete pavement slab from pouring the inside concrete of beginning to the period of being in service, includes PVC drum 3, the concrete has been pour to the left side inner chamber of PVC drum, and the right side inner chamber of PVC drum is provided with rather than sliding fit's survey stress device, survey the stress device and be connected with the concrete 12 of left side inner chamber.
In this embodiment, the left end of PVC drum is provided with seals apron 9, it has screw thread I shape reinforcing bar 10 to seal the welding on the apron, the one end of screw thread I shape reinforcing bar is located the concrete of left side inner chamber, and the other end of screw thread I shape reinforcing bar is used for being connected with left side road surface concrete to the mechanical interlock between the concrete of better reinforcing PVC drum left side inner chamber and the left side road surface concrete.
In the embodiment, the PVC cylinder is 500mm long and 105mm in diameter; through holes are densely distributed on the surface of the PVC cylinder, and the diameter of each through hole is 5mm so as to ensure the free exchange of the humidity inside and outside the cylinder; the inner wall of the PVC cylinder is provided with an elastic material 11 which is beneficial to the radial free deformation of the concrete in the inner cavity at the left side, and the thickness of the elastic material is 3 mm.
In this embodiment, the whole stress measuring device is wrapped by the PVC cylinder 3, and a plastic film is disposed at a connection portion of the inside of the PVC cylinder and the stress measuring device, so that the stress measuring device can freely slide along the axial direction of the PVC cylinder.
In this embodiment, the concrete in the left inner cavity and the pavement concrete are poured simultaneously, and the growth ages are consistent.
In this embodiment, survey stress device includes concrete column 8, the both ends of concrete are provided with cushion 6 respectively, transversely are provided with vibrating wire formula reinforcing bar stressometer 1 in the concrete column, vibrating wire formula reinforcing bar stressometer's both ends are connected with respectively and pass overhanging biography power member 4 of cushion, the other end correspondence of overhanging biography power member is connected with and is used for the ring flange 2 that is connected with the concrete of left side inner chamber or right side pavement concrete.
In this embodiment, for better connection with the overhanging force transmission rod piece, the left and right ends of the vibrating wire type steel bar stress meter are respectively provided with an inner concave notch with threads, the overhanging force transmission rod piece is a steel bar with one end provided with threads and connected with the inner concave notch, and the other end of the steel bar is welded at the central position of the flange plate.
In the embodiment, the overhanging length of the steel bar is 5mm and penetrates through the elastic pad, and the elastic pad is an elastic rubber pad with the thickness of 5mm and the outer diameter of 100mm, so that the flange plate is isolated from the concrete column through the elastic rubber pad; the thickness of ring flange is 5mm, and the diameter is 100 mm.
In this embodiment, the flange plate is welded with T-shaped threaded steel bars 5 anchored with the concrete in the left inner cavity or the concrete in the right pavement respectively, and the mechanical engaging force between the flange plate and the concrete in the left inner cavity of the PVC cylinder and the concrete in the right pavement is enhanced by the T-shaped threaded steel bars.
In this embodiment, the vibrating wire type steel bar stress meter is provided with a stress meter data line 7 penetrating through the concrete column, the PVC cylinder and the pavement concrete so as to output the stress value.
In this embodiment, the flanges on the left and right sides of the stress monitoring device receive different strains of concrete; the left flange plate reflects the temperature strain and the humidity strain of concrete in the PVC cylinder, the right flange plate reflects the temperature strain, the humidity strain, the elastic strain and the creep of other concrete on a road surface, wherein the left side and the right side of the temperature strain and the humidity strain which are irrelevant to the stress counteract each other, the elastic strain and the creep strain which are relevant to the stress of the concrete cause the vibration frequency change of a steel string in the vibrating string type steel bar stress meter, and the internal stress of the measured position concrete can be calculated and obtained by combining the reading of the vibrating string type steel bar stress meter and the area of the flange plate.
The use method of the internal stress monitoring device for the cement concrete pavement slab comprises the following steps:
1) before the cement pavement slab is poured, an internal stress monitoring device of the cement concrete pavement slab is placed at a position to be tested;
2) pouring concrete into the left inner cavity of the PVC cylinder while pouring the cement pavement slab, so that the growth age of the concrete in the left inner cavity is consistent with that of the pavement concrete, and enabling the data line of the vibrating string type steel bar stressometer to penetrate out of the pavement concrete;
3) in the concrete hardening and service process, the left and right flange plates receive different concrete strains, wherein the left and right sides of the temperature strain and the humidity strain which are irrelevant to the stress are mutually offset, the elastic strain and the creep strain which are relevant to the concrete stress cause the vibration frequency change of a steel string in the vibrating string type steel bar stress meter, and the measured internal stress of the concrete at the position is obtained through calculation by combining the reading of the vibrating string type steel bar stress meter with the area of the flange plates.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
It will be apparent to those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and that various modifications, changes, substitutions and alterations can be made without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a cement concrete pavement slab internal stress monitoring devices, includes the PVC drum, its characterized in that, the concrete has been pour to the left side inner chamber of PVC drum, and the right side inner chamber of PVC drum is provided with rather than sliding fit's survey stress device, it is connected with the concrete of left side inner chamber to survey the stress device.
2. The device of claim 1, wherein the stress measuring device comprises a concrete column, elastic pads are respectively arranged at two ends of the concrete, a vibrating wire type steel bar stress meter is transversely arranged in the concrete column, two ends of the vibrating wire type steel bar stress meter are respectively connected with an outward extending force transmission rod piece penetrating through the elastic pads, and the other end of the outward extending force transmission rod piece is correspondingly connected with a flange plate used for being connected with concrete of the left inner cavity or concrete of the right pavement.
3. The device for monitoring the internal stress of the cement concrete pavement slab according to claim 2, wherein the left end and the right end of the vibrating wire type steel bar stress meter are respectively provided with a concave notch with threads, the outward extending force transmission rod piece is a steel bar with one end provided with threads and connected with the concave notch, and the other end of the steel bar is welded at the central position of the flange plate.
4. The stress monitoring device in the cement concrete pavement slab as claimed in claim 3, wherein the external extending length of the steel bar is 5mm and passes through an elastic pad, and the elastic pad is an elastic rubber pad with the thickness of 5mm and the external diameter of 100 mm; the thickness of ring flange is 5mm, and the diameter is 100 mm.
5. The device for monitoring the internal stress of the cement concrete pavement slab as claimed in claim 2, 3 or 4, wherein the flange is welded with T-shaped threaded steel bars anchored with the concrete of the left inner cavity or the concrete of the right pavement respectively.
6. The apparatus of claim 2, wherein the vibrating wire type steel bar stressometer is provided with a stressometer data line penetrating through the concrete column, the PVC cylinder and the pavement concrete.
7. The stress monitoring device for the cement concrete pavement slab inner stress as recited in claim 1, characterized in that the left end of the PVC cylinder is provided with a sealing cover plate, the sealing cover plate is provided with a threaded i-shaped steel bar, one end of the threaded i-shaped steel bar is located in the concrete of the left inner cavity, and the other end of the threaded i-shaped steel bar is used for connecting with the left pavement concrete.
8. The device for monitoring the internal stress of the cement concrete pavement slab as claimed in claim 1, 2, 3, 4, 6 or 7, wherein the PVC cylinder is densely distributed with through holes on the surface, the inner wall of the PVC cylinder is provided with an elastic material which is beneficial to the free radial deformation of the concrete in the left inner cavity, and the connecting part between the PVC cylinder and the stress measuring device is provided with a plastic film.
9. The stress monitoring device in a cement concrete pavement slab as recited in claim 8, wherein the PVC cylinder is 500mm long and 105mm in diameter; the diameter of the through hole is 5 mm; the thickness of the elastic material is 3 mm.
10. The use method of the internal stress monitoring device applied to the cement concrete pavement slab as claimed in claim 6 is characterized by comprising the following steps:
1) before the cement pavement slab is poured, an internal stress monitoring device of the cement concrete pavement slab is placed at a position to be tested;
2) pouring concrete into the left inner cavity of the PVC cylinder while pouring the cement pavement slab, so that the growth age of the concrete in the left inner cavity is consistent with that of the pavement concrete, and enabling a stress meter data line of the vibrating string type steel bar stress meter to penetrate out of the pavement concrete;
3) and calculating to obtain the concrete internal stress of the measured position by combining the reading of the vibrating wire type steel bar stress meter and the area of the flange plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911414147.4A CN110864839A (en) | 2019-12-31 | 2019-12-31 | Internal stress monitoring device for cement concrete pavement slab and using method thereof |
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| CN201911414147.4A CN110864839A (en) | 2019-12-31 | 2019-12-31 | Internal stress monitoring device for cement concrete pavement slab and using method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114894362A (en) * | 2022-05-11 | 2022-08-12 | 中国水利水电科学研究院 | Method and device for measuring stress of cylinder column force measurement type concrete structure in whole process |
| CN116608972A (en) * | 2023-05-15 | 2023-08-18 | 中国科学院武汉岩土力学研究所 | Vibrating wire type stress meter and stress test equipment suitable for low-temperature environment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106703224A (en) * | 2017-01-05 | 2017-05-24 | 浙江大学建筑设计研究院有限公司 | Overlength concrete wall crack control design method based on hidden-type crack induction inserts |
| US20180011075A1 (en) * | 2016-07-08 | 2018-01-11 | Tsinghua University | Concrete temperature stress testing machine system and concrete temperature stress testing method |
| CN108593896A (en) * | 2018-05-04 | 2018-09-28 | 中国水利水电科学研究院 | Fully graded concrete is unstressed strain gauge means and measurement method |
| CN108844514A (en) * | 2018-05-04 | 2018-11-20 | 中国水利水电科学研究院 | Strain gauge and the unstressed strain gauge means of fully graded concrete |
| JP2019109164A (en) * | 2017-12-19 | 2019-07-04 | 太平洋セメント株式会社 | Stress monitoring sensor and stress monitoring method |
| CN110318556A (en) * | 2019-07-19 | 2019-10-11 | 江苏东南特种技术工程有限公司 | It is a kind of novel without support displacement shear wall concrete apparatus and method |
| CN211234804U (en) * | 2019-12-31 | 2020-08-11 | 福州大学 | Internal stress monitoring device for cement concrete pavement slab |
-
2019
- 2019-12-31 CN CN201911414147.4A patent/CN110864839A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180011075A1 (en) * | 2016-07-08 | 2018-01-11 | Tsinghua University | Concrete temperature stress testing machine system and concrete temperature stress testing method |
| CN106703224A (en) * | 2017-01-05 | 2017-05-24 | 浙江大学建筑设计研究院有限公司 | Overlength concrete wall crack control design method based on hidden-type crack induction inserts |
| JP2019109164A (en) * | 2017-12-19 | 2019-07-04 | 太平洋セメント株式会社 | Stress monitoring sensor and stress monitoring method |
| CN108593896A (en) * | 2018-05-04 | 2018-09-28 | 中国水利水电科学研究院 | Fully graded concrete is unstressed strain gauge means and measurement method |
| CN108844514A (en) * | 2018-05-04 | 2018-11-20 | 中国水利水电科学研究院 | Strain gauge and the unstressed strain gauge means of fully graded concrete |
| CN110318556A (en) * | 2019-07-19 | 2019-10-11 | 江苏东南特种技术工程有限公司 | It is a kind of novel without support displacement shear wall concrete apparatus and method |
| CN211234804U (en) * | 2019-12-31 | 2020-08-11 | 福州大学 | Internal stress monitoring device for cement concrete pavement slab |
Non-Patent Citations (1)
| Title |
|---|
| 王国杰;郑建岚;: "混凝土结构早龄期应力相关应变现场监测与分析", 工程力学, no. 09, 25 September 2009 (2009-09-25) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114894362A (en) * | 2022-05-11 | 2022-08-12 | 中国水利水电科学研究院 | Method and device for measuring stress of cylinder column force measurement type concrete structure in whole process |
| CN116608972A (en) * | 2023-05-15 | 2023-08-18 | 中国科学院武汉岩土力学研究所 | Vibrating wire type stress meter and stress test equipment suitable for low-temperature environment |
| CN116608972B (en) * | 2023-05-15 | 2024-03-22 | 中国科学院武汉岩土力学研究所 | Vibrating wire type stress meter and stress test equipment suitable for low-temperature environment |
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