CN114991028A - Steel bridge fatigue crack self-adjusting prestress reinforcing system and method - Google Patents
Steel bridge fatigue crack self-adjusting prestress reinforcing system and method Download PDFInfo
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- CN114991028A CN114991028A CN202210693359.6A CN202210693359A CN114991028A CN 114991028 A CN114991028 A CN 114991028A CN 202210693359 A CN202210693359 A CN 202210693359A CN 114991028 A CN114991028 A CN 114991028A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 114
- 239000010959 steel Substances 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 17
- 238000012544 monitoring process Methods 0.000 claims abstract description 31
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 30
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000004873 anchoring Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000005728 strengthening Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 7
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000376 effect on fatigue Effects 0.000 description 1
- 238000005516 engineering process Methods 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
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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- 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
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- 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
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Abstract
A steel bridge fatigue crack self-adjusting prestress reinforcing system and a method thereof are provided, the self-adjusting prestress reinforcing system comprises: the prestress tensioning device is arranged across the fatigue crack of the steel bridge and can close the crack under stress; the fatigue crack opening monitoring switch is arranged at the position of the fatigue crack of the steel bridge and is used for opening and closing according to the expansion and the opening of the fatigue crack of the steel bridge; and the control device is used for correlating the fatigue crack opening monitoring switch with the starting and stopping of the prestress tensioning device so as to keep the fatigue crack of the steel bridge in a closed state all the time. The invention can apply prestress to close the steel bridge at 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, enable the steel bridge fatigue crack to play the aim of limiting the expansion from the reinforcement starting stage, and improve the structural durability after the steel bridge 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 system and a method for self-adjusting prestress reinforcement of the fatigue cracks of the steel bridge, and belongs to the technical field of steel structure bridge maintenance.
Background
In recent years, with the popularization of steel structure bridge construction in China, the proportion and scale of the steel structure bridge are obviously improved. However, under the repeated action of vehicle load, the influence of unavoidable hidden defects in the construction period is added, so that the fatigue cracks of the steel structure bridge continuously appear, the fatigue cracks become a main disease form, the durability of the steel structure bridge is seriously influenced, even the operation safety of the steel structure bridge is threatened, the further popularization and application of the steel structure bridge in China are restricted, and the maintenance and reinforcement of the fatigue cracks become a difficult problem which needs to be solved urgently.
In the prior art, the fatigue cracks of the steel bridge are generally treated by reinforcing modes such as air gouging and heavy welding, drilling and crack arrest, CFRP (carbon fiber reinforced plastics) adhesion, steel plate adhesion, bolted steel plate adhesion and the like. Among them, the gas gouging rewelding process is complicated, the cost is high, the efficiency is low, the welding causes the material performance change and the too high stress, it is unfavorable to the fatigue performance improvement, so generally propose to adopt the way of cold maintenance to carry on the treatment of fatigue crack; the drilling crack arrest operation is simple, but the drilling crack arrest operation is only used as a temporary crack arrest measure and cannot limit the further expansion of fatigue cracks; the bolted steel plate method has good treatment effect on fatigue cracks, but the construction workload is large, a large number of drill holes seriously reduce the 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 arrest effect is good, and the method becomes a main method for maintaining and reinforcing the fatigue cracks.
However, the adhesion of CFRP and the adhesion of steel plates also have technical limitations. Firstly, after a fatigue crack is generated, a CFRP and a steel plate are pasted across the fatigue crack, the CFRP and the steel plate which are pasted initially are in a relaxed stress-free state, an open crack cannot be closed, and further expansion of the open crack can be delayed and limited only from the current state; secondly, along with the expansion of the fatigue crack, the tensile stress of the adhered CFRP and the steel plate is gradually increased along with the increase of the opening degree of the crack, but the tensile stress at the initial expansion stage is smaller, the reinforcing effect is limited, and the fatigue crack has a certain expansion evolution period; when the fatigue crack is opened to a certain degree, the CFRP and the steel plate play a complete restriction and restriction role.
Disclosure of Invention
In order to overcome the defects of the related technology, the invention provides a steel bridge fatigue crack self-adjusting prestress reinforcing system and method, which can apply prestress to close the steel bridge fatigue crack at the initial fatigue crack stage, automatically adjust the prestress according to the crack expansion state in the fatigue crack expansion process, always keep the crack in the closed state, enable the fatigue crack to achieve the purpose of limiting the expansion from the reinforcement starting stage, and improve the structural durability after the fatigue crack is generated.
The invention adopts a technical scheme for solving the technical problems that:
a steel bridge fatigue crack self-adjusting pre-stress reinforcement system, comprising:
the prestress tensioning device is arranged across the fatigue crack of the steel bridge and can close the crack under stress;
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 correlating the fatigue crack opening monitoring switch with the starting and stopping of the prestress tensioning device so as to keep the fatigue crack of the steel bridge in a closed state all the time.
According to the technical scheme, the prestress tensioning device and the fatigue crack opening monitoring switch are arranged at the fatigue crack of the steel bridge, and the two sides of the fatigue crack of the steel bridge can be exerted with gathered external force through the prestress tensioning device arranged across the fatigue crack of the steel bridge, so that crack repair is realized; the crack state is monitored by the fatigue crack opening monitoring switch, the steel bridge fatigue crack is closed initially, the fatigue crack opening monitoring switch is correspondingly opened when the crack opening degree is increased, after the switch is opened, the control device triggers the prestress tensioning device to start to close the crack, and after the crack is closed, the prestress tensioning device stops stress and reciprocates cyclically, so that the steel bridge fatigue crack is kept in a closed state all the time. Finally, the prestress is automatically adjusted according to the crack propagation state in the steel bridge fatigue crack propagation process, so that the fatigue crack can be limited from the reinforcement starting stage, and the structural durability of the steel bridge after the fatigue crack is generated is improved.
The other technical scheme adopted by the invention for solving the technical problem is as follows:
a steel bridge fatigue crack self-adjusting prestress reinforcing method 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 wire to penetrate through a preformed hole of the base, and sleeving an anchorage device at the outer end part of the base;
step three, stretching the shape memory alloy wire on one side of the base, retracting the anchorage after force is removed, anchoring the shape memory alloy wire on the base, and closing the fatigue cracks of the steel bridge;
fourthly, arranging a control device beside the prestress tensioning device, and arranging a fatigue crack opening monitoring switch at a fatigue crack of the steel bridge to enable the fatigue crack to be in a closed contact state;
and step five, 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 material is located, and automatically controlling the switching on of the circuit by the control device according to the fatigue crack propagation condition of the steel bridge to apply prestress so that the fatigue crack of the steel bridge is in a closed state.
According to the reinforcing method of the technical scheme, the steel bridge fatigue cracks are tensioned and closed by using the shape memory alloy wire, the crack expansion and opening are monitored by the fatigue crack opening monitoring switch, the prestress tensioning device can be started immediately after the cracks are expanded, the steel bridge fatigue cracks are kept in a closed state all the time, the cracks are repaired quickly, and the structural durability of the steel bridge is improved.
Drawings
The invention is further illustrated with reference to the following figures and examples:
FIG. 1 is a schematic structural view of a self-adjusting pre-stressed reinforcement system in accordance with an embodiment of the present invention;
FIG. 2 is an enlarged view of the structure at A in FIG. 1;
FIG. 3 is a schematic view of the construction of a pre-stressed tension device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the control device according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a fatigue crack opening monitoring switch according to an embodiment of the present invention.
The reference numbers in the figures illustrate:
10. a self-adjusting pre-stress reinforcement system; 20. fatigue cracking of the steel bridge;
1. the prestress tension device comprises a prestress tension device 11, a base 12, a shape memory alloy wire 13, a first lead 14, an anchorage 141, a clamping piece 142 and an insulating sheath;
2. a fatigue crack opening monitoring switch 21, a contact 22 and a second lead;
3. the control device 31, the electromagnetic switch component 311, the battery 312, the electromagnet 32, the heating component 321, the power supply 322, the fuse 323, the magnetic switch 33 and the box body.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Fig. 1 to 5 show a schematic structural view of a preferred embodiment of the present invention, which shows a steel bridge fatigue crack self-adjusting prestressing reinforcement system 10, comprising:
the prestress tensioning device 1 is arranged across the steel bridge fatigue crack 20, and can close the steel bridge fatigue crack 20 under 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 the control device 3 is used for correlating 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 devices 1 in respective structural forms, the fatigue cracks 20 of the steel bridge are stressed to contract, and the cracks are closed and repaired. The steel bridge fatigue crack 20 begins to expand and is opened, the two ends of the crack opening monitoring switch 2 generate displacement along with the follow-up, the fatigue crack opening monitoring switch 2 is switched off, the control device 3 is linked with the prestress tensioning device 1 to start working, so that the steel bridge fatigue crack 20 is effectively closed in time, after the steel bridge fatigue crack opening monitoring switch 2 is automatically closed along with the steel bridge fatigue crack opening monitoring switch, the control device 3 controls the prestress tensioning device 1 to stop stress, the operation is repeated in a circulating mode, and the steel bridge fatigue crack 20 is always restrained and kept closed in time.
In an optional 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 on two sides of the steel bridge fatigue crack 20 in the traveling direction, a plurality of shape memory alloy wires 12 are respectively connected between the bases 11 on 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 first wires 13 and then 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 tension device 1 is stressed to close the steel bridge fatigue crack 20.
As a further preferred embodiment of the present invention, the base 11 is a steel base, and is fixedly connected to a portion of the steel bridge where the steel bridge fatigue crack 20 is located. The steel base can ensure a firmer fixing and force application foundation and is convenient to be connected with the steel bridge into a whole; in one embodiment, the steel base may be attached to the steel bridge by epoxy glue, such as the diaphragm plate that generates the fatigue crack 20 of the steel bridge.
In an optional implementation manner of the embodiment of the invention, the prestress tensioning device further comprises an anchor 14, and the shape memory alloy wire 12 is fixed in a reserved hole on the base 11 through the anchor 14.
The use of the anchorage 14 can keep the shape memory alloy wire 12 in an anchoring state all the time in the stretching process of the shape memory alloy wire 12, and a good stretching effect is obtained.
As a further preferred embodiment of the present invention, the anchor 14 includes a clamping piece 141 and an insulating sheath 142, which are internally and externally sleeved, the insulating sheath 142 is in a truncated cone shape as a whole, a conical through hole is formed inside the insulating sheath, the clamping piece 141 is a truncated cone body having a cylindrical inner hole, the truncated cone body is formed by butt-jointing at least two truncated cone bodies having 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 12.
The connection portion of the shape memory alloy wire material 12 and the first lead 13 can be placed in the clip 141 and then placed in the insulating sheath 142, and they are pressed and locked together in the cylindrical prepared hole. Meanwhile, in the process of tensioning the shape memory alloy wire 12, the clamping piece 141 and the insulating sheath 142 of the structure also play a role in tensioning at any time.
The specific construction of anchor 14 is not limited to the embodiments set forth herein, and may be replaced by other existing anchors, or by other tools that effect the securing and tensioning functions.
As a further preferred embodiment of the present invention, the fatigue crack opening monitoring switch 2 is a travel switch, and two contacts 21 of the travel switch and the control device 3 form an electromagnetic switch circuit through a second lead 22. The two contacts 21 are respectively arranged at two sides of the steel bridge fatigue crack 20, at the beginning of installation, the two contacts 21 are combined together under the crack closing state, after the crack is expanded, the two contacts 21 are gradually separated, and after the crack is completely separated, the electromagnetic switch loop is disconnected.
In an optional 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 to the two contacts 21 of the fatigue crack opening monitoring switch 2;
the heating assembly 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 end and the tail end of all the shape memory alloy wires 12;
the magnetic switch 323 is arranged 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 supply 321, the fuse 322, the magnetic switch 323 and the SMA is disconnected. When the steel bridge fatigue crack 20 begins to expand and the opening degree is increased, the fatigue crack opening monitoring switch 2 is switched off, the electromagnet 312 does not work, the heating loop is switched on, the SMA generates heat under the action of current, the SMA heats up to generate prestress, and the prestress tension device 1 is stressed to close the crack. After the crack is closed, the electromagnet 312 loop is switched on, the heating loop is switched off, and the circulation is repeated, so that the steel bridge fatigue crack 20 is always kept in a closed state.
As a further preferred implementation manner of the embodiment of the present invention, the control device 3 further includes a box 33, and the electromagnetic switch assembly 31 and the heating assembly 32 are integrated in the box 33. The box body 33 mainly plays a role in protection and is convenient to centrally arrange.
As a further preferred embodiment of the present invention, a magnet is further disposed on the back of the box 33 for adsorbing the vicinity of the location of the steel bridge fatigue crack 20 on the steel bridge. Utilize magnet can adsorb controlling means 3 on the steel construction, simple to operate, simple high-efficient.
Referring to fig. 1 to 5, an embodiment of the present invention further provides a self-adjusting prestress strengthening method for steel bridge fatigue cracks, including 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;
fixing a base 11 at a preset position, enabling a shape memory alloy wire 12 to penetrate through a preformed hole of the base 11, and sleeving an anchorage 14 at the outer end part of the base 11;
step three, stretching the shape memory alloy wire 12 on one side of the base 11, retracting the anchorage 14 after force is removed, and anchoring the shape memory alloy wire 12 on the base 11 to close the steel bridge fatigue crack 20;
step four, arranging the control device 3 beside the prestress tensioning device 1, and arranging a fatigue crack opening monitoring switch 2 at a fatigue crack 20 of the steel bridge to enable the steel bridge to be in a closed contact state;
and step five, switching on an electromagnetic switch circuit where the fatigue crack opening monitoring switch 2 is located and a heating circuit where the shape memory alloy wire 12 is located, and automatically controlling the switching on circuit by the control device 3 according to the expansion condition of the steel bridge fatigue crack 20 to apply prestress so that the steel bridge fatigue crack 20 is in a closed state.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the technical spirit of the present invention are included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a steel bridge fatigue crack is from adjusting prestressing force reinforceing system which characterized by includes:
the prestress tensioning device is arranged across the fatigue crack of the steel bridge and can close the crack under stress;
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 correlating the fatigue crack opening monitoring switch with the starting and stopping of the prestress tensioning device so as to keep the fatigue crack of the steel bridge in a closed state all the time.
2. The steel bridge fatigue crack self-adjusting prestress reinforcing system of claim 1, wherein: the prestress tension device comprises a base and shape memory alloy wires, the base is arranged on two sides of the steel bridge fatigue crack trend, the shape memory alloy wires are respectively connected between the bases on the two sides of the steel bridge fatigue crack, and all the shape memory alloy wires are connected in series end to end through first leads and then form a heating loop with the control device.
3. The steel bridge fatigue crack self-adjusting prestress strengthening system of claim 2, wherein: the base is a steel base and is fixedly connected to the position of the fatigue crack of the steel bridge.
4. A steel bridge fatigue crack self-adjusting prestressing strengthening system according to claim 2 or 3, wherein: the prestress tensioning device further comprises an anchorage device, and the shape memory alloy wire is fixed in the reserved hole in the base through the anchorage device.
5. The steel bridge fatigue crack self-adjusting prestress reinforcing system of claim 4, wherein: the anchor comprises a clamping piece and an insulating sheath, wherein the clamping piece and the insulating sheath are sleeved with each other, the whole insulating sheath is in a cone frustum shape, a conical through hole is formed in the insulating sheath, the clamping piece is a cone frustum body with a cylindrical inner hole, the cone frustum body is formed by butt joint of at least two circular truncated cone split bodies which are equally divided into 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.
6. The steel bridge fatigue crack self-adjusting prestress reinforcing system of claim 2, wherein: 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 lead.
7. The steel bridge fatigue crack self-adjusting prestress reinforcing system of claim 6, wherein: 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 and the electromagnet are matched to form a control switch.
8. The steel bridge fatigue crack self-adjusting prestressing reinforcing system of claim 7, wherein: the control device further comprises a box body, and the electromagnetic switch assembly and the heating assembly are integrated in the box body.
9. The steel bridge fatigue crack self-adjusting prestressing reinforcing system of claim 8, wherein: and the back of the box body is also provided with a magnet for adsorbing the magnet near the position of the fatigue crack of the steel bridge on the steel bridge.
10. A steel bridge fatigue crack self-adjusting prestress reinforcing method 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 wire to penetrate through a preformed hole of the base, and sleeving an anchorage device at the outer end part of the base;
step three, stretching the shape memory alloy wire on one side of the base, retracting the anchorage after force is removed, anchoring the shape memory alloy wire on the base, and closing the fatigue cracks of the steel bridge;
fourthly, arranging a control device beside the prestress tensioning device, and arranging a fatigue crack opening monitoring switch at a fatigue crack of the steel bridge to enable the fatigue crack to be in a closed contact state;
and step five, 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 material is located, and automatically controlling the switching on circuit by the control device according to the fatigue crack propagation condition of the steel bridge to apply prestress so that the fatigue crack of the steel bridge is in a closed state.
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| 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 |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210693359.6A CN114991028B (en) | 2022-06-17 | 2022-06-17 | Steel bridge fatigue crack self-adjusting prestress reinforcement system and method |
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| CN114991028A true CN114991028A (en) | 2022-09-02 |
| CN114991028B CN114991028B (en) | 2024-02-20 |
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|---|---|---|---|---|
| WO1996012588A1 (en) * | 1994-10-19 | 1996-05-02 | Dpd, Inc. | Shape-memory material repair system and method of use therefor |
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| CN108396662A (en) * | 2018-04-03 | 2018-08-14 | 西南交通大学 | Steel bridge assembled reinforcement means and its bracing means |
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| 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 |
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| 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 |
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| CN113638325A (en) * | 2021-08-06 | 2021-11-12 | 广西大学 | Steel structure fatigue crack reinforcing structure and reinforcing method thereof |
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| CN114991028B (en) | 2024-02-20 |
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