CN114991028B - Steel bridge fatigue crack self-adjusting prestress reinforcement system and method - Google Patents
Steel bridge fatigue crack self-adjusting prestress reinforcement system and method Download PDFInfo
- Publication number
- CN114991028B CN114991028B CN202210693359.6A CN202210693359A CN114991028B CN 114991028 B CN114991028 B CN 114991028B CN 202210693359 A CN202210693359 A CN 202210693359A CN 114991028 B CN114991028 B CN 114991028B
- Authority
- CN
- China
- Prior art keywords
- fatigue crack
- steel bridge
- prestress
- crack
- shape memory
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 107
- 239000010959 steel Substances 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000002787 reinforcement Effects 0.000 title claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 36
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 21
- 230000009471 action Effects 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 6
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000008439 repair process Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 241000169624 Casearia sylvestris Species 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 229920006335 epoxy glue Polymers 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
A self-adjusting prestress reinforcement system and method for fatigue crack of a steel bridge, the self-adjusting prestress reinforcement system comprises: the prestress tensioning device is arranged across the fatigue crack of the steel bridge and can be stressed to close the crack; the fatigue crack opening monitoring switch is arranged at the position of the fatigue crack of the steel bridge and used for opening and closing according to the expansion and opening of the fatigue crack of the steel bridge; and the control device is used for associating the fatigue crack opening monitoring switch with the start and stop of the prestress tensioning device so that the fatigue crack of the steel bridge is always kept in a closed state. The invention can apply the prestress to close the initial steel bridge fatigue crack stage, automatically adjust the prestress according to the crack expansion state in the steel bridge fatigue crack expansion process, always keep the crack in the closed state, and can limit the expansion of the steel bridge fatigue crack from the reinforcing starting stage, thereby improving the structural durability of the steel bridge after the fatigue crack is generated.
Description
Technical Field
The invention relates to a device and a method for treating fatigue cracks of a steel bridge, in particular to a self-adjusting prestress reinforcing system and a self-adjusting prestress reinforcing method for the fatigue cracks of the steel bridge, and belongs to the technical field of maintenance of steel structure bridges.
Background
In recent years, along with the popularization of the construction of the steel structure bridge in China, the proportion and the scale of the steel structure bridge are obviously improved. However, under the repeated action of the vehicle load, the influence of unavoidable hidden defects in the construction period is additionally added, and fatigue cracks of the steel structure bridge are continuously generated, so that the fatigue cracks become a main disease form, the durability of the steel structure bridge is seriously influenced, the operation safety of the steel structure bridge is even threatened, further popularization and application of the steel structure bridge in China are restricted, and the problem that the fatigue crack maintenance and reinforcement are needed to be solved is solved.
In the prior art, reinforcing modes such as gouging re-welding, drilling crack stopping, CFRP pasting, steel plate bolting and the like are generally adopted to treat the fatigue crack of the steel bridge. Wherein, the gouging re-welding procedure is complex, the cost is high, the efficiency is low, the welding causes material performance change and too high stress, and the improvement of fatigue performance is unfavorable, so the treatment of fatigue cracks by adopting a cold maintenance mode is generally recommended; the drilling crack arrest operation is simple, but can only be used as a temporary crack arrest measure, and further expansion of fatigue cracks can not be limited; the bolting steel plate method has good effect of treating fatigue cracks, but has large construction workload, a large number of holes are used for severely reducing structural rigidity, and a new fatigue crack source is introduced; the CFRP and the steel plate are the most common cold maintenance and reinforcement methods applied at present, the construction process is simple, the crack-stopping effect is good, and the method becomes a main method for repairing and reinforcing fatigue cracks.
However, there are technical limitations in attaching CFRP and attaching steel plates. Firstly, after the fatigue crack is generated, the CFRP and the steel plate are stuck across the fatigue crack, the CFRP and the steel plate which are stuck initially are in a relaxed stress-free state, the open crack cannot be closed, and the further expansion of the CFRP and the steel plate can only be delayed and limited from the current state; secondly, along with the expansion of the fatigue crack, the tensile stress of the adhered CFRP and steel plate is gradually increased along with the increase of the crack opening degree, but the tensile stress is smaller at the initial stage of expansion, the reinforcement effect is limited, and a certain expansion evolution period exists for the fatigue crack; when the fatigue crack opens to a certain extent, the CFRP and the steel plate play a role in completely limiting and restraining.
Disclosure of Invention
In order to overcome the defects of the related art, the invention provides a self-adjusting prestress reinforcing system and method for a fatigue crack of a steel bridge, which can apply prestress to close the initial fatigue crack, automatically adjust the prestress according to the crack expansion state in the fatigue crack expansion process, always keep the crack in a closed state, enable the fatigue crack to achieve the aim of limiting the expansion from the reinforcing starting stage, and improve the structural durability after the fatigue crack is generated.
The invention solves the technical problems by adopting a technical scheme that:
a steel bridge fatigue crack self-adjusting prestress reinforcement system, comprising:
the prestress tensioning device is arranged across the fatigue crack of the steel bridge and can be stressed to close the crack;
the fatigue crack opening monitoring switch is arranged at the position of the fatigue crack of the steel bridge and used for opening and closing according to crack expansion and opening;
and the control device is used for associating the fatigue crack opening monitoring switch with the start and stop of the prestress tensioning device so that the fatigue crack of the steel bridge is always kept in a closed state.
According to the technical scheme, the prestress tensioning device and the fatigue crack opening monitoring switch are arranged at the fatigue crack position of the steel bridge, and the prestress tensioning device which is arranged across the fatigue crack of the steel bridge can apply gathering external force to two sides of the fatigue crack of the steel bridge, so that crack repair is realized; the monitoring of the crack state is realized through the fatigue crack opening monitoring switch, the fatigue crack of the steel bridge is closed at the beginning, when the crack opening degree is increased, the fatigue crack opening monitoring switch is correspondingly opened, after the switch is opened, the control device triggers the prestress stretching device to start so as to close the crack, after the crack is closed, the prestress stretching device stops being stressed and repeats circularly, so that the fatigue crack of the steel bridge is always kept in the closed state. Finally, the automatic adjustment of the prestress in the steel bridge fatigue crack expansion process according to the crack expansion state is realized, so that the fatigue crack is limited from the reinforcing starting stage, and the structural durability of the steel bridge after the fatigue crack is generated is improved.
The other technical scheme adopted for solving the technical problems is as follows:
the self-adjusting prestress reinforcement method for the fatigue crack of the steel bridge comprises the following operation steps:
step one, arranging a prestress tensioning device across a steel bridge fatigue crack, and determining the position of a base;
fixing the base at a preset position, enabling the shape memory alloy wires to pass through the base preformed holes, and sleeving the outer end of the base into an anchor;
step three, stretching the shape memory alloy wire on one side of the base, retracting the anchor after unloading force, and anchoring the shape memory alloy wire on the base to close the fatigue crack of the steel bridge;
arranging a fatigue crack opening monitoring switch at the fatigue crack of the steel bridge by arranging a control device beside the prestress stretching device so as to enable the fatigue crack opening monitoring switch to be in a closed contact state;
and fifthly, switching on an electromagnetic switch loop where the fatigue crack opening monitoring switch is located and a heating loop where the shape memory alloy wire is located, wherein the control device automatically controls the switching-on circuit to apply prestress according to the expansion condition of the fatigue crack of the steel bridge, so that the fatigue crack of the steel bridge is in a closed state.
According to the reinforcement method, the shape memory alloy wire is used for tensioning and closing the fatigue crack of the steel bridge, and the crack expansion and the expansion are monitored through the fatigue crack expansion monitoring switch, so that the prestress tensioning device can be started immediately after the crack expansion occurs, the fatigue crack of the steel bridge is kept in a closed state all the time, the rapid repair of the crack is effectively completed, and the structural durability of the steel bridge is improved.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of a self-adjusting prestress reinforcement system according to one embodiment of the invention;
fig. 2 is an enlarged view of the structure at a in fig. 1;
FIG. 3 is a schematic diagram of a prestress tensioning device according to one embodiment of the invention;
FIG. 4 is a schematic diagram of a control device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a fatigue crack opening monitoring switch in accordance with an embodiment of the present invention.
The reference numerals in the drawings illustrate:
10. self-adjusting prestress reinforcement system; 20. fatigue crack of the steel bridge;
1. the device comprises a prestress tensioning device 11, a base 12, a shape memory alloy wire 13, a first lead 14, an anchor 141, a clamping piece 142 and an insulating sheath;
2. the fatigue crack opening monitoring switch, 21, the contact, 22 and the second lead;
3. control device 31, electromagnetic switch subassembly, 311, battery, 312, electro-magnet, 32, heating component, 321, power, 322, fuse, 323, magnetic switch, 33, box.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
FIGS. 1-5 illustrate a schematic structural diagram of a preferred embodiment of the present invention, a steel bridge fatigue crack self-adjusting prestress reinforcement system 10, comprising:
the prestress tensioning device 1 is arranged across the steel bridge fatigue crack 20, and can enable the steel bridge fatigue crack 20 to be closed by stress;
the fatigue crack opening monitoring switch 2 is arranged at the position of the fatigue crack 20 of the steel bridge and is used for opening and closing according to crack expansion and opening;
and a control device 3 for associating the fatigue crack opening monitoring switch 2 with the start and stop of the prestress tensioning device 1 so as to keep the steel bridge fatigue crack 20 in a closed state all the time.
Based on the prestress tensioning device 1 in the respective structural form, stress shrinkage is carried out at the fatigue crack 20 of the steel bridge, and crack closure repair is carried out. The steel bridge fatigue crack 20 starts to expand, the crack opens, the two ends of the crack opening monitoring switch 2 follow-up to generate displacement, the fatigue crack opening monitoring switch 2 is opened according to the displacement, the control device 3 is used for linking the prestress stretching device 1 to start working, so that the steel bridge fatigue crack 20 is effectively closed in time, after repair, the fatigue crack opening monitoring switch 2 is automatically closed, the control device 3 is used for controlling the prestress stretching device 1 to stop being stressed, the steel bridge fatigue crack 20 is restrained and kept closed in time all the time, and the steel bridge fatigue crack is repeatedly operated.
In an alternative implementation manner of the embodiment of the present invention, the prestress tensioning device 1 includes a base 11 and shape memory alloy wires 12 (SMA for short), the base 11 is disposed at two sides of the steel bridge fatigue crack 20, a plurality of shape memory alloy wires 12 are respectively connected between the bases 11 at two sides of the steel bridge fatigue crack 20, and all the shape memory alloy wires 12 are connected in series end to end through a first wire 13 to form a heating loop with the control device 3.
The heating loop is connected, the SMA generates heat under the action of current, the SMA heats up to generate prestress, and the prestress tensioning device 1 is stressed to enable the steel bridge fatigue crack 20 to be closed.
As a further preferred embodiment of the present embodiment, the base 11 is a steel base, and is fixedly connected to the location of the fatigue crack 20 of the steel bridge. The steel base can ensure a firm fixed and force-applying foundation and is convenient to be connected with a steel bridge into a whole; in practice, the steel base may be glued to the steel bridge by means of an epoxy glue, for example to the diaphragm where the steel bridge fatigue cracks 20 occur.
In an alternative implementation of the embodiment of the present invention, the prestress tensioning device further comprises an anchor 14, and the shape memory alloy wire 12 is fixed in a preformed hole on the base 11 through the anchor 14.
The anchor 14 can keep the anchoring state of the shape memory alloy wire 12 all the time in the tensioning process of the shape memory alloy wire 12, and good tensioning effect is obtained.
As a further preferred implementation manner of the embodiment of the present invention, the anchor device 14 includes a clamping piece 141 and an insulating sheath 142 that are sleeved inside and outside, the insulating sheath 142 is in a truncated cone shape, a conical through hole is formed inside the insulating sheath, the clamping piece 141 is a truncated cone body with a cylindrical inner hole, the truncated cone body is formed by butt-jointing at least two truncated cones with equal cross sections, and the inner diameter of the cylindrical inner hole is smaller than or equal to the outer diameter of the shape memory alloy wire 12.
The connection portion of the shape memory alloy wire 12 and the first wire 13 may be placed in the clip 141 and then placed in the insulating sheath 142, and then pressed together in the cylindrical preformed hole to be locked. Meanwhile, the clamping piece 141 and the insulating sheath 142 with the structures have the tensioning function at any time in the tensioning process of the shape memory alloy wire 12.
The specific configuration of anchor 14 is not limited to the embodiments shown, but may be replaced by other existing anchors or other means of achieving the securing and tensioning action.
As a further preferred embodiment of the example of the invention, the fatigue crack opening monitoring switch 2 is a travel switch, the two contacts 21 of which form an electromagnetic switching circuit with the control device 3 via a second line 22. The two contacts 21 are respectively arranged at two sides of the fatigue crack 20 of the steel bridge, at the beginning of the installation, in the crack closing state, the two contacts 21 are combined together, after the crack is expanded, the two contacts 21 are gradually separated, and after the two contacts are thoroughly separated, the electromagnetic switch loop is opened.
In an alternative implementation manner of the embodiment of the present invention, the control device 3 includes an electromagnetic switch assembly 31 and a heating assembly 32, the electromagnetic switch assembly 31 is formed by connecting a battery 311 and an electromagnet 312 in series, and the battery 311 and the electromagnet 312 are respectively connected with two contacts 21 of the fatigue crack opening monitoring switch 2;
the heating component 32 is composed of a power source 321, a fuse 322 and a magnetic switch 323 which are electrically connected in sequence, and the power source 321 and the magnetic switch 323 are also respectively connected with the head ends and the tail ends of all the shape memory alloy wires 12;
the magnetic switch 323 is configured as a control switch in cooperation with the electromagnet 312.
The fatigue crack opening monitoring switch 2 is closed, an electromagnetic switch loop formed by the battery 311 and the electromagnet 312 is connected, the electromagnet 312 adsorbs the magnetic switch 323, and a heating loop formed by the power source 321, the fuse 322, the magnetic switch 323 and the SMA is disconnected. When the steel bridge fatigue crack 20 starts to expand, after the expansion degree is increased, the fatigue crack expansion monitoring switch 2 is turned off, the electromagnet 312 is not in action, the heating circuit is turned on, the SMA generates heat under the action of current, the SMA heats up to generate prestress, and the prestress stretching device 1 is stressed to enable the crack to be closed. After the crack is closed, the electromagnet 312 is switched on, the heating circuit is switched off, and the heating circuit is cycled to and fro, so that the fatigue crack 20 of the steel bridge is kept in a closed state all the time.
As one of the further preferred implementation of the embodiment of the invention, the control device 3 further comprises a housing 33, the electromagnetic switch assembly 31 and the heating assembly 32 being integrated within the housing 33. The box 33 mainly plays a role in protection and is convenient for centralized placement.
As a further preferred embodiment of the present invention, a magnet is further disposed on the back of the box 33, for being adsorbed near the location of the fatigue crack 20 of the steel bridge on the steel bridge. The control device 3 can be adsorbed on the steel structure by utilizing the magnet, and the installation is convenient, simple and efficient.
Referring to fig. 1-5, the embodiment of the invention also provides a self-adjusting prestress reinforcement method for fatigue crack of a steel bridge, which comprises the following operation steps:
step one, arranging a prestress tensioning device 1 across a steel bridge fatigue crack 20, and determining the position of a base 11; meanwhile, the position of the base 11 can be determined, the steel plate is polished, and the surface quality meets the requirements;
step two, fixing the base 11 at a preset position, enabling the shape memory alloy wire 12 to pass through a preformed hole of the base 11, and sleeving the outer end part of the base 11 into an anchor device 14;
step three, stretching the shape memory alloy wire 12 on one side of the base 11, retracting the anchor 14 after unloading force, and anchoring the shape memory alloy wire 12 on the base 11 to close the steel bridge fatigue crack 20;
step four, arranging a control device 3 beside the prestress tensioning device 1, and arranging a fatigue crack opening monitoring switch 2 at a steel bridge fatigue crack 20 to enable the fatigue crack opening monitoring switch to be in a closed contact state;
and fifthly, switching on an electromagnetic switch loop where the fatigue crack opening monitoring switch 2 is positioned and a heating loop where the shape memory alloy wire 12 is positioned, wherein the control device 3 automatically controls the switching-on circuit to apply prestress according to the expansion condition of the steel bridge fatigue crack 20, so that the steel bridge fatigue crack 20 is in a closed state.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, but any simple modification and equivalent variation of the above embodiment according to the technical spirit of the present invention falls within the scope of the present invention.
Claims (5)
1. A steel bridge fatigue crack self-adjusting prestress reinforcement system, comprising:
the prestress tensioning device is arranged across the fatigue crack of the steel bridge and can be stressed to close the crack;
the fatigue crack opening monitoring switch is arranged at the position of the fatigue crack of the steel bridge and used for opening and closing according to crack expansion and opening;
the control device is used for associating the fatigue crack opening monitoring switch with the start and stop of the prestress tensioning device so that the fatigue crack of the steel bridge is always kept in a closed state;
the prestress tensioning device comprises bases and shape memory alloy wires, the bases are arranged on two sides of the trend of the fatigue crack of the steel bridge, a plurality of shape memory alloy wires are respectively connected between the bases on two sides of the fatigue crack of the steel bridge, and all the shape memory alloy wires are connected in series with the control device end to end through a first lead to form a heating loop;
the prestress tensioning device further comprises an anchor, and the shape memory alloy wire is fixed in a reserved hole on the base through the anchor;
the anchorage comprises a clamping piece and an insulating sheath which are sleeved outside and inside, the whole insulating sheath is in a truncated cone shape, a conical through hole is formed in the insulating sheath, the clamping piece is a truncated cone body with a cylindrical inner hole, the truncated cone body is formed by butt joint of at least two truncated cones with bisected cross sections, and the inner diameter of the cylindrical inner hole is smaller than or equal to the outer diameter of the shape memory alloy wire;
the fatigue crack opening monitoring switch is a travel switch, and two contacts of the fatigue crack opening monitoring switch and the control device form an electromagnetic switch loop through a second wire;
the control device comprises an electromagnetic switch assembly and a heating assembly, wherein the electromagnetic switch assembly is formed by connecting a battery and an electromagnet in series, and the battery and the electromagnet are respectively connected with two contacts of the fatigue crack opening monitoring switch;
the heating assembly consists of a power supply, a fuse and a magnetic switch which are electrically connected in sequence, and the power supply and the magnetic switch are also respectively connected with the head end and the tail end of all the shape memory alloy wires;
the magnetic switch is matched with the electromagnet to be arranged as a control switch;
the fatigue crack opening monitoring switch is closed, an electromagnetic switch loop formed by the battery and the electromagnet is connected, and the electromagnet adsorbs the magnetic switch to disconnect a heating loop formed by the power supply, the fuse, the magnetic switch and the shape memory alloy wire; when the fatigue crack of the steel bridge starts to expand and the opening degree is increased, the fatigue crack opening monitoring switch is turned off, the electromagnet does not work, the heating loop is turned on, the shape memory alloy wire generates heat under the action of current, the shape memory alloy wire is heated and raised to generate prestress, and the prestress stretching device is stressed to enable the crack to be closed; after the cracks are closed, the electromagnet loop is connected, the heating loop is disconnected, and the heating loop is cycled and reciprocated, so that the fatigue cracks of the steel bridge are kept in a closed state all the time.
2. The steel bridge fatigue crack self-adjusting prestress reinforcement system of claim 1, wherein: the base is a steel base and is fixedly connected to the part where the fatigue crack of the steel bridge is located.
3. The steel bridge fatigue crack self-adjusting prestress reinforcement system of claim 1, wherein: the control device further comprises a box body, and the electromagnetic switch assembly and the heating assembly are integrated in the box body.
4. A steel bridge fatigue crack self-adjusting prestress reinforcement system as set forth in claim 3, wherein: the back of the box body is also provided with a magnet which is used for being adsorbed near the position where the fatigue crack of the steel bridge is located on the steel bridge.
5. A method for self-adjusting prestress reinforcement of fatigue crack of steel bridge, which is realized by the self-adjusting prestress reinforcement system of fatigue crack of steel bridge according to claim 1, and is characterized by comprising the following operation steps:
step one, arranging a prestress tensioning device across a steel bridge fatigue crack, and determining the position of a base;
fixing the base at a preset position, enabling the shape memory alloy wires to pass through the base preformed holes, and sleeving the outer end of the base into an anchor;
step three, stretching the shape memory alloy wire on one side of the base, retracting the anchor after unloading force, and anchoring the shape memory alloy wire on the base to close the fatigue crack of the steel bridge;
arranging a fatigue crack opening monitoring switch at the fatigue crack of the steel bridge by arranging a control device beside the prestress stretching device so as to enable the fatigue crack opening monitoring switch to be in a closed contact state;
and fifthly, switching on an electromagnetic switch loop where the fatigue crack opening monitoring switch is located and a heating loop where the shape memory alloy wire is located, wherein the control device automatically controls the switching-on circuit to apply prestress according to the expansion condition of the fatigue crack of the steel bridge, so that the fatigue crack of the steel bridge is in a closed state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210693359.6A CN114991028B (en) | 2022-06-17 | 2022-06-17 | Steel bridge fatigue crack self-adjusting prestress reinforcement system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210693359.6A CN114991028B (en) | 2022-06-17 | 2022-06-17 | Steel bridge fatigue crack self-adjusting prestress reinforcement system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114991028A CN114991028A (en) | 2022-09-02 |
| CN114991028B true CN114991028B (en) | 2024-02-20 |
Family
ID=83034872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210693359.6A Active CN114991028B (en) | 2022-06-17 | 2022-06-17 | Steel bridge fatigue crack self-adjusting prestress reinforcement system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114991028B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996012588A1 (en) * | 1994-10-19 | 1996-05-02 | Dpd, Inc. | Shape-memory material repair system and method of use therefor |
| CN205002832U (en) * | 2015-07-24 | 2016-01-27 | 徐工集团工程机械股份有限公司科技分公司 | Braking heat dissipation oil tank liquid -level monitoring device |
| CN108396662A (en) * | 2018-04-03 | 2018-08-14 | 西南交通大学 | Steel bridge assembled reinforcement means and its bracing means |
| CN109899027A (en) * | 2019-04-08 | 2019-06-18 | 贵州盘江精煤股份有限公司 | A kind of gas drilling level pressure grout injection control device |
| CN113279340A (en) * | 2021-06-09 | 2021-08-20 | 同济大学建筑设计研究院(集团)有限公司 | Fatigue crack reinforcing structure and method for arc-shaped notch of diaphragm plate of steel bridge deck |
| CN113309015A (en) * | 2021-07-06 | 2021-08-27 | 西南交通大学 | Reinforcing system and method for fatigue cracking of longitudinal rib butt weld of steel bridge |
| CN214656487U (en) * | 2021-05-08 | 2021-11-09 | 中交第二航务工程局有限公司 | Steel bridge active reinforcing system based on shape memory alloy |
| CN113638325A (en) * | 2021-08-06 | 2021-11-12 | 广西大学 | Steel structure fatigue crack reinforcing structure and reinforcing method thereof |
-
2022
- 2022-06-17 CN CN202210693359.6A patent/CN114991028B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996012588A1 (en) * | 1994-10-19 | 1996-05-02 | Dpd, Inc. | Shape-memory material repair system and method of use therefor |
| CN205002832U (en) * | 2015-07-24 | 2016-01-27 | 徐工集团工程机械股份有限公司科技分公司 | Braking heat dissipation oil tank liquid -level monitoring device |
| CN108396662A (en) * | 2018-04-03 | 2018-08-14 | 西南交通大学 | Steel bridge assembled reinforcement means and its bracing means |
| CN109899027A (en) * | 2019-04-08 | 2019-06-18 | 贵州盘江精煤股份有限公司 | A kind of gas drilling level pressure grout injection control device |
| CN214656487U (en) * | 2021-05-08 | 2021-11-09 | 中交第二航务工程局有限公司 | Steel bridge active reinforcing system based on shape memory alloy |
| CN113279340A (en) * | 2021-06-09 | 2021-08-20 | 同济大学建筑设计研究院(集团)有限公司 | Fatigue crack reinforcing structure and method for arc-shaped notch of diaphragm plate of steel bridge deck |
| CN113309015A (en) * | 2021-07-06 | 2021-08-27 | 西南交通大学 | Reinforcing system and method for fatigue cracking of longitudinal rib butt weld of steel bridge |
| CN113638325A (en) * | 2021-08-06 | 2021-11-12 | 广西大学 | Steel structure fatigue crack reinforcing structure and reinforcing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114991028A (en) | 2022-09-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5158527A (en) | Method and apparatus for mechanically joining concrete-reinforcing rods | |
| CN201622207U (en) | Bolt tensile strength test clamp | |
| CN114991028B (en) | Steel bridge fatigue crack self-adjusting prestress reinforcement system and method | |
| CN102950622A (en) | Drilling tool and method of drilling | |
| CN102561210B (en) | Carbon fiber bar in-vitro prestressed tensioning device and using method thereof | |
| CN110387805A (en) | A kind of novel pre-stressed stayed structure based on marmem | |
| CN113309015A (en) | Reinforcing system and method for fatigue cracking of longitudinal rib butt weld of steel bridge | |
| CN111155785B (en) | Damaged steel plate reinforcing device and reinforcing method | |
| CN110469052B (en) | Steel-concrete composite beam connecting piece, steel-concrete composite beam and manufacturing method | |
| CN106298756A (en) | A kind of IGBT series connection crimps encapsulation unit and uses the dc circuit breaker of this encapsulation unit | |
| CN206146966U (en) | Contactor test fixture | |
| US2569059A (en) | Welded rivet construction for electrical brushes and contacts | |
| US20210194102A1 (en) | Method for electrically contacting a battery block | |
| CN113028131A (en) | Test system and method of main steam quick isolation valve and fast reactor main steam system | |
| CN208313714U (en) | A kind of automotive sheet cross-wire weld point sample stretching clamp | |
| CN202170962U (en) | Deenyma rope anchoring device | |
| CN2227159Y (en) | Compound anchoring device for pre-stress tension fibre reinforcment | |
| CN214136583U (en) | Concrete self-curing device | |
| CN111622130B (en) | Concrete bridge prestress distributed anchoring device and method | |
| CN211815509U (en) | Low-retraction anchoring device for wedge-shaped prestressed tendons | |
| CN208268158U (en) | A kind of connection tripper based on electromagnet | |
| CN209211650U (en) | A kind of vertical prestressing anchoring system of box beam monoblock type anchor slab | |
| DE102016117273A1 (en) | Relay with a controller and method for controlling a relay | |
| CN110377077B (en) | Automatic pump room starting and stopping control system | |
| CN100584602C (en) | A method of reinforcing a structure and a clamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |