WO2020148794A1 - Device for the static and dynamic monitoring of supporting structures - Google Patents
Device for the static and dynamic monitoring of supporting structures Download PDFInfo
- Publication number
- WO2020148794A1 WO2020148794A1 PCT/IT2020/050003 IT2020050003W WO2020148794A1 WO 2020148794 A1 WO2020148794 A1 WO 2020148794A1 IT 2020050003 W IT2020050003 W IT 2020050003W WO 2020148794 A1 WO2020148794 A1 WO 2020148794A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- point
- monitoring device
- supporting
- elongated
- supporting structure
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0008—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of bridges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0066—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by exciting or detecting vibration or acceleration
Definitions
- the present invention relates to a device for statically and dynamically monitoring load-bearing structures.
- the invention relates to a device for statically and dynamically monitoring horizontal load-bearing structures, such as attics, bridge decks, beams and other civil, military and industrial load-bearing structures.
- Said instruments which have a high measurement precision (better than a tenth of a millimeter), are usually used together or as an alternative to other measuring instruments which are connected between the structure and a fixed and steady reference point.
- the object of the present invention is to propose a device for statically and dynamically monitoring load-bearing structures and, in particular, of horizontal load-bearing structures, which allows to carry out vertical displacement measurements of said structures even without having fixed reference points below the structure.
- Another object of the present invention is to provide a device for statically and dynamically monitoring load-bearing structures, which allows performing absolute displacement measurements even for long periods of time.
- a further object of the present invention is to provide a device for statically and dynamically monitoring load-bearing structures, which is easily transportable and which is more reliable and cheap than the known devices.
- the subject of the present invention is a device for statically and dynamically monitoring load-bearing structures, according to the attached claim 1.
- FIG. 1 shows a schematic view of a static and dynamic monitoring device applied to a horizontal supporting structure, according to the present invention
- FIG. 2 shows detailed schematic views of some parts of the monitoring device of figure 1 , according to the present invention
- FIG. 5 schematically shows an embodiment of a sensor used in the monitoring device of figure 1 , according to the present invention.
- 10 generally indicates a load- bearing structure, in particular a horizontal load-bearing structure, such as a span of a bridge.
- an elongated support element (catenary) 15 is used, such as a chain, a rope, a wire or a tape in general; the support element 15 is kept stretched between two points which are preferably located at the ends of the load-bearing structure 10.
- the elongated support element 15 is kept stretched horizontally between a fixed anchoring point 1 1 , provided at one end of the load-bearing structure 10, and a sliding resting point 13 made integral with said load-bearing structure 10 at the other end of the structure 10.
- a pulley 18 is preferably placed in the sliding resting point 13 on which the elongated support element 15 slides, while the end of the elongated element 15, on the opposite side with respect to the fixed anchoring point 11 , is equipped with a suitable ballast 14.
- the elongated support element 15 is made of a material with high mechanical strength and is not influenced by thermal effects that could change its geometry since the thermal effects that cause elongations or shortenings are compensated by the ballast 14 which keeps the element 15 stretched and acts as an absolute reference for positioning a displacement sensor 12, preferably an optical, mechanical or magnetic sensor, which is fixed to the load-bearing structure 10 and which is connected to the elongated support element 15.
- the fixed anchoring point 1 1 and the sliding resting point 13, between which the elongated support element 15 is kept stretched horizontally, are preferably positioned in correspondence with the relative supports 16, 17 of the load-bearing structure 10.
- the load-bearing structure 10 is made up of a bridge, two accelerometers are positioned at the beginning and at the end of the span and in particular at the fixed anchoring point 1 1 and at the sliding resting point 13, while a third accelerometer is integrated in the displacement sensor 12.
- the elongated or catenary element 15 is able to contain he power cables of the two accelerometers which are therefore far from the accelerometer integrated in the sensor 12.
- the displacement sensor 12 is connected, through respective cables 19, 20, to the accelerometers placed, respectively, at the fixed anchoring point 1 1 and at the sliding resting point 13.
- the displacement sensor 12 has an output cable 21 for sending the detected signals to a suitable electronic acquisition and processing circuit.
- the vertical displacement measurement of the load-bearing structure 10 is thus carried out by the sensor 12 in predetermined times and at programmable regular time intervals, in order to verify any anomalies and/or critical conditions of the structure.
- the characteristics of the device for statically and dynamically monitoring load-bearing structures in particular horizontal load-bearing structures, such as attics, bridge decks, beams and civil, military and industrial structures, which is the subject of the present invention, are clear, as well as the related advantages.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Bridges Or Land Bridges (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
A device for statically and dynamically monitoring load-bearing structures (10), comprising an elongated supporting element (15), such as a chain, a rope, a wire or a tape in general, which is kept stretched between two points placed at the ends of a supporting structure (10), of which a first point is an anchorage point (11) fixed to the supporting structure (10) and a second point is a sliding support point (13) which is integral with the supporting structure (10). The elongated supporting element (15) is fixed, at one of its first ends, to the anchorage point (11) and is connected, at a second end opposite to the first end, to a ballast (14). A displacement sensor (12) is connected to the elongated supporting element (15) and said sensor (12) is fixed to the supporting structure (10).
Description
DEVICE FOR THE STATIC AND DYNAMIC MONITORING OF SUPPORTING
STRUCTURES
DESCRIPTION The present invention relates to a device for statically and dynamically monitoring load-bearing structures.
In particular, the invention relates to a device for statically and dynamically monitoring horizontal load-bearing structures, such as attics, bridge decks, beams and other civil, military and industrial load-bearing structures.
In order to perform vertical displacement measurements of flat load- bearing structures, such as floors, beams and/or road bridge decks, it is possible to use optical instruments placed above the deck or electric or electronic displacement instruments positioned under the structure.
Said instruments, which have a high measurement precision (better than a tenth of a millimeter), are usually used together or as an alternative to other measuring instruments which are connected between the structure and a fixed and steady reference point.
However, said measurements, which are normally performed by means of sensors mounted on rigid supports or wire sensors, cannot be performed whenever the area below the structure is not usable due to the presence of waterways, road or railway locations.
Furthermore, if it is necessary to automate the measurements for long periods, such as in case of structural monitoring, it is impossible to perform absolute displacement measurements.
Therefore, the object of the present invention is to propose a device for statically and dynamically monitoring load-bearing structures and, in particular, of horizontal load-bearing structures, which allows to carry out vertical displacement measurements of said structures even without having fixed reference points below the structure.
Another object of the present invention is to provide a device for statically and dynamically monitoring load-bearing structures, which allows performing absolute displacement measurements even for long periods of time.
A further object of the present invention is to provide a device for statically and dynamically monitoring load-bearing structures, which is easily transportable and which is more reliable and cheap than the known devices.
Therefore, the subject of the present invention is a device for statically and dynamically monitoring load-bearing structures, according to the attached claim 1.
Other detailed technical characteristics are disclosed in the dependent claims.
The present invention will now be described, for illustrative but not limitative purposes, according to a preferred embodiment and with particular reference to the attached figures, in which:
- figure 1 shows a schematic view of a static and dynamic monitoring device applied to a horizontal supporting structure, according to the present invention;
- figures 2, 3 and 4 show detailed schematic views of some parts of the monitoring device of figure 1 , according to the present invention;
- figure 5 schematically shows an embodiment of a sensor used in the monitoring device of figure 1 , according to the present invention.
With reference to the figures mentioned, 10 generally indicates a load- bearing structure, in particular a horizontal load-bearing structure, such as a span of a bridge.
According to the invention, an elongated support element (catenary) 15 is used, such as a chain, a rope, a wire or a tape in general; the support element 15 is kept stretched between two points which are preferably located at the ends of the load-bearing structure 10.
Advantageously, the elongated support element 15 is kept stretched horizontally between a fixed anchoring point 1 1 , provided at one end of the load-bearing structure 10, and a sliding resting point 13 made integral with said load-bearing structure 10 at the other end of the structure 10.
A pulley 18 is preferably placed in the sliding resting point 13 on which the elongated support element 15 slides, while the end of the elongated element 15, on the opposite side with respect to the fixed anchoring point
11 , is equipped with a suitable ballast 14.
The elongated support element 15 is made of a material with high mechanical strength and is not influenced by thermal effects that could change its geometry since the thermal effects that cause elongations or shortenings are compensated by the ballast 14 which keeps the element 15 stretched and acts as an absolute reference for positioning a displacement sensor 12, preferably an optical, mechanical or magnetic sensor, which is fixed to the load-bearing structure 10 and which is connected to the elongated support element 15.
The fixed anchoring point 1 1 and the sliding resting point 13, between which the elongated support element 15 is kept stretched horizontally, are preferably positioned in correspondence with the relative supports 16, 17 of the load-bearing structure 10.
The presence of said fixed anchoring point 1 1 and sliding resting point 13 allow, if necessary, an optimal management of the dynamic measurements, as they said points allow the identification of two critical instants for this type of control, namely the entry and exit of the load- bearing structure 10 along the monitored section.
In practice, if the load-bearing structure 10 is made up of a bridge, two accelerometers are positioned at the beginning and at the end of the span and in particular at the fixed anchoring point 1 1 and at the sliding resting point 13, while a third accelerometer is integrated in the displacement sensor 12.
In this case, the elongated or catenary element 15 is able to contain he power cables of the two accelerometers which are therefore far from the accelerometer integrated in the sensor 12.
Alternatively, the displacement sensor 12 is connected, through respective cables 19, 20, to the accelerometers placed, respectively, at the fixed anchoring point 1 1 and at the sliding resting point 13.
Furthermore, the displacement sensor 12 has an output cable 21 for sending the detected signals to a suitable electronic acquisition and processing circuit.
The vertical displacement measurement of the load-bearing structure 10 is
thus carried out by the sensor 12 in predetermined times and at programmable regular time intervals, in order to verify any anomalies and/or critical conditions of the structure.
Therefore, it is possible to make an accurate and reliable measurement over time using an extremely simple and economic instrument.
From the above description, the characteristics of the device for statically and dynamically monitoring load-bearing structures, in particular horizontal load-bearing structures, such as attics, bridge decks, beams and civil, military and industrial structures, which is the subject of the present invention, are clear, as well as the related advantages.
Finally, it is clear that a preferred embodiment of the present invention has been described, but it is to be understood that those skilled in the art will be able to make modifications and changes without thereby departing from the scope of protection as defined by the attached claims.
Claims
1. A static and dynamic monitoring device of supporting structures (10), characterized in that it comprises an elongated supporting element (15), such as a chain, a rope, a wire or a webbing, which is kept stretched between two points placed at the ends of a supporting structure (10), of which a first point is an anchorage point (1 1 ) fixed to said supporting structure (10) and a second point is a sliding supporting point (13) integral to said supporting structure (10), said elongated supporting element (15) being fixed, at a first end thereof, to said anchorage point (1 1 ) and being connected, at a second end opposite to said first end, to a ballast (14), a displacement sensor (12), which is fixed to said supporting structure (10), being also connected to said elongated supporting element (15).
2. The monitoring device as claimed in claim 1 , characterized in that said supporting structure (10) is an horizontal structure, such as a floor, a span of a bridge or a beam.
3. The monitoring device according to at least one of the previous claims, characterized in that a pulley (18) is installed at said sliding supporting point (13), on which said elongated supporting element (15) slides.
4. The monitoring device according to at least one of the previous claims, characterized in that said elongated supporting element (15) is made of a material which cannot be influenced by thermal effects.
5. The monitoring device according to at least one of the previous claims, characterized in that said anchorage point (1 1 ) and said sliding supporting point (13) are placed in correspondence with respective supports (16, 17) of said supporting structure (10).
6. The monitoring device according to at least one of the previous claims, characterized in that two relative accelerometers are positioned at said anchorage point (1 1 ) and at said sliding supporting point (13).
7. The monitoring device as claimed in claim 6, characterized in that a third accelerometer is integrated in said displacement sensor (12).
8. The monitoring device according to at least one of the claims 6 and 7,
characterized in that said elongated supporting element (15) is configured to contain the power supply cables of said two accelerometers.
9. The monitoring device according to at least one of the claims 6, 7 and 8, characterized in that said displacement sensor (12) is connected, by means of respective cables (19, 20), to said first accelerometers.
10. The monitoring device according to at least one of the previous claims, characterized in that said displacement sensor (12) has an output cable (21 ) for sending detected signals to an electronic data acquisition and processing circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT102019000000621 | 2019-01-15 | ||
| IT102019000000621A IT201900000621A1 (en) | 2019-01-15 | 2019-01-15 | DEVICE FOR STATIC AND DYNAMIC MONITORING OF SUPPORTING STRUCTURES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2020148794A1 true WO2020148794A1 (en) | 2020-07-23 |
Family
ID=66166455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IT2020/050003 WO2020148794A1 (en) | 2019-01-15 | 2020-01-14 | Device for the static and dynamic monitoring of supporting structures |
Country Status (2)
| Country | Link |
|---|---|
| IT (1) | IT201900000621A1 (en) |
| WO (1) | WO2020148794A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024056148A1 (en) * | 2022-09-12 | 2024-03-21 | Vsl International Ag | Sensing system for measuring physical parameters of a stay cable and method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4364034A (en) * | 1980-12-19 | 1982-12-14 | Bellatty Thomas A | Monitoring system for movement of tunnels and other structures |
| EP2439507A1 (en) * | 2010-10-05 | 2012-04-11 | Christa Reiners | Method and device for testing the stability of a cable system |
| DE102014106701A1 (en) * | 2014-05-13 | 2015-11-19 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Method for determining a static bending stiffness of an object from dynamic acceleration measurements after a vibration excitation of the object |
| WO2017200380A1 (en) * | 2016-05-18 | 2017-11-23 | Heijmans N.V. | Method for determining the structural integrity of an infrastructural element |
-
2019
- 2019-01-15 IT IT102019000000621A patent/IT201900000621A1/en unknown
-
2020
- 2020-01-14 WO PCT/IT2020/050003 patent/WO2020148794A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4364034A (en) * | 1980-12-19 | 1982-12-14 | Bellatty Thomas A | Monitoring system for movement of tunnels and other structures |
| EP2439507A1 (en) * | 2010-10-05 | 2012-04-11 | Christa Reiners | Method and device for testing the stability of a cable system |
| DE102014106701A1 (en) * | 2014-05-13 | 2015-11-19 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Method for determining a static bending stiffness of an object from dynamic acceleration measurements after a vibration excitation of the object |
| WO2017200380A1 (en) * | 2016-05-18 | 2017-11-23 | Heijmans N.V. | Method for determining the structural integrity of an infrastructural element |
Also Published As
| Publication number | Publication date |
|---|---|
| IT201900000621A1 (en) | 2020-07-15 |
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