CN209975357U - Bridge expansion joint anchoring structure - Google Patents
Bridge expansion joint anchoring structure Download PDFInfo
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- CN209975357U CN209975357U CN201920487909.2U CN201920487909U CN209975357U CN 209975357 U CN209975357 U CN 209975357U CN 201920487909 U CN201920487909 U CN 201920487909U CN 209975357 U CN209975357 U CN 209975357U
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- 238000004873 anchoring Methods 0.000 title claims abstract description 103
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 90
- 239000010959 steel Substances 0.000 claims abstract description 90
- 239000004567 concrete Substances 0.000 claims abstract description 44
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 30
- 239000000835 fiber Substances 0.000 claims abstract description 17
- 239000010426 asphalt Substances 0.000 claims abstract description 7
- 239000002344 surface layer Substances 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000005336 cracking Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000003014 reinforcing effect Effects 0.000 description 6
- 238000003466 welding Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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Abstract
The utility model relates to the technical field of bridge engineering, a bridge expansion joint anchoring structure is provided, which comprises a bridge body and a bridge joint, wherein the expansion joint is positioned between the bridge body, the bridge body comprises a precast beam and an anchoring body, an asphalt surface layer is paved on one side of the upper end of the precast beam, and the anchoring body is positioned on the other side of the upper end of the precast beam; be equipped with embedded steel bar in the precast beam, embedded steel bar is connected with the anchor steel sheet through the anchor steel bar, the anchor steel bar is arranged in the anchor body, the anchor steel sheet is located the upper end of anchor body is close to bridge seam one side, the anchor body includes first anchor body and second anchor body, first anchor body is located second anchor body downside, first anchor body is ultra high performance concrete, the second anchor body is C50 steel fiber concrete. By the structure, the bridge expansion joint device is not easy to be damaged, and the service life is prolonged.
Description
Technical Field
The utility model belongs to the technical field of the bridge engineering technique and specifically relates to indicate and provide a bridge expansion joint anchor structure.
Background
The anchoring structure for bridge expansion joints is to meet the deformation requirement of bridge deck caused by climate temperature change (thermal expansion and cold contraction), and usually, expansion devices are arranged between two beam ends, between a beam end and a bridge abutment or at the hinged position of a bridge. The requirement is firm and reliable, and the vehicle is smooth when running and has no sudden jump and noise; it is necessary to prevent rainwater and garbage from being infiltrated and blocked. The expansion joint anchoring concrete is easy to damage, and the main reasons include that the expansion joint anchoring concrete is poor in interface bonding with old concrete to generate a gap; under the expansion joint profile steel, concrete is easy to form holes to form a cantilever structure, and the stress capability is poor; the surface of the anchor is prone to shrinkage cracking.
Disclosure of Invention
In order to solve the technical problems, the utility model mainly aims to provide a bridge expansion joint anchoring structure, which can firmly bond the expansion joint anchoring structure and a precast beam and is not easy to generate gaps; the fluidity of the freshly mixed ultrahigh-performance concrete is excellent, the concrete under the expansion joint section steel is compact, and the stress capacity is good; the anchoring body surface layer C50 steel fiber concrete has excellent anti-cracking performance and is not easy to damage.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the bridge expansion joint anchoring structure comprises bridge bodies and bridge seams, wherein the bridge seams are positioned between the bridge bodies, each bridge body comprises a precast beam and an anchoring body, an asphalt surface layer is paved on one side of the upper end of each precast beam, and the anchoring body is positioned on the other side of the upper end of each precast beam; the prefabricated beam is internally provided with embedded steel bars, the embedded steel bars are connected with an anchoring steel plate through anchoring steel bars, the anchoring steel bars are arranged in the anchoring bodies, the anchoring steel plate is located at the upper end of the anchoring bodies and close to one side of the bridge seam, each anchoring body comprises a first anchoring body and a second anchoring body, the first anchoring bodies are located at the lower sides of the second anchoring bodies, the first anchoring bodies are of ultra-high performance concrete (UHPC) structures, and the second anchoring bodies are C50 steel fiber concrete.
Preferably in this embodiment, the embedded steel bars include first reinforcing bars and second reinforcing bars, the first reinforcing bars are connected with the second reinforcing bars at a preset angle, and one end of each embedded steel bar is connected with the anchoring steel bars along the axial direction of the bridge seam.
In this embodiment, preferably, the anchoring steel plate includes a first side plate and a second side plate, the first side plate and the second side plate are connected at a predetermined angle, the first side plate is close to the bridge seam, and the second side plate is connected to the anchoring steel bar.
In this embodiment, preferably, the length direction of the first side plate is the same as the axial direction of the bridge seam, and the second side plate is perpendicularly connected to the first side plate.
In this embodiment, the length direction of the first side plate is perpendicular to the axis direction of the bridge seam, and the second side plate is perpendicularly connected to the first side plate.
In this embodiment, it is preferable that the first anchor is located on a lower side of a bottom end surface of the anchor steel plate, the second anchor is located on an upper side of the bottom end surface of the anchor steel plate, and the first anchor is connected to the second anchor.
In this embodiment, it is preferable that the first anchor is located on a lower side of the anchor steel plate, the anchor steel plate is located inside the second anchor, and the first anchor is connected to the second anchor.
Preferably in this embodiment, the first anchor height is 80% of the anchor height.
Preferably in this embodiment, the first anchor height is 15% of the anchor height.
In this embodiment, preferably, there are two bridge bodies, and the two bridge bodies are connected by a sealing strip.
The utility model provides a bridge expansion joint anchor structure can bring following at least one
Has the advantages that:
1. the utility model discloses in, lay ultra high performance concrete through anchor body lower floor, C50 steel fiber concrete is laid on the upper strata, and ultra high performance concrete makes the new and old concrete interface bonding between expansion joint anchor structure and precast beam firm, is difficult for producing the gap, is difficult for taking place to destroy.
2. The utility model discloses in, through with ultra high performance concrete placement expansion joint device anchor steel sheet lower wall department, because its mobility is good, can effectually prevent that the concrete is not closely knit under the expansion joint anchor shaped steel, avoid forming under the expansion joint closely knit and cantilever structure.
3. The utility model discloses in, adopt that ultra high performance concrete fatigue resistance is good, shock resistance, antiknock performance are good, can improve the ability of the anti vehicle impact load of expansion joint.
4. The utility model discloses in, the ultra high performance concrete of adoption, the shrink is great, and anti cracking capability is poor, so the second anchor body just can use the concrete that adds fibre and lower water consumption, reducible concrete shrinkage cracking.
Drawings
Fig. 1 is a schematic view of an anchoring structure for an expansion joint according to this embodiment.
Fig. 2 is a schematic view of the four-expansion-joint anchoring structure of the embodiment.
Fig. 3 is a schematic view of the anchoring structure for five expansion joints in this embodiment.
The reference numbers illustrate:
10. the bridge comprises a bridge body, 11 prefabricated beams, 111 embedded steel bars, 12 anchoring bodies, 121 anchoring steel plates, 1211 first side plates, 1212 second side plates, 122 anchoring steel bars, 123 first anchoring bodies, 124 second anchoring bodies, 125 anchoring steel plates A, 1251 first side plates A, 1252 second side plates A, 13 asphalt surface layers, 20 bridge seams and 30 sealing strips.
Detailed Description
While the present invention may be susceptible to embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present description is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to that as illustrated herein.
Thus, a feature indicated in this specification will serve to explain one of the features of an embodiment of the invention, and not to imply that every embodiment of the invention must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
In the embodiments shown in the drawings, the directions (such as up, down, left, right, front, and rear) are used to explain the structure and movement of the various components of the present invention not absolutely, but relatively. These illustrations are appropriate when these components are in the positions shown in the figures. If the description of the positions of these components changes, the indication of these directions changes accordingly.
The preferred embodiments of the present invention will be further described in detail with reference to the accompanying drawings.
In the first embodiment, as shown in fig. 1, the first embodiment provides a bridge expansion joint anchoring structure, which includes bridge bodies 10 and bridge seams 20, where the bridge seams 20 are located between the bridge bodies 10, the bridge bodies 10 are placed horizontally, the axial direction of the bridge seams 20 is a vertical direction, the bridge bodies 10 include precast beams 11 and anchoring bodies 12, the precast beams 11 are a poured concrete structure, an asphalt surface layer 13 is laid on the left side of the upper ends of the precast beams 11, the anchoring bodies 12 are located on the right side of the upper ends of the precast beams 11, and the upper end surfaces of the asphalt surface layers 13 are flush with the upper end surfaces of the anchoring bodies 12; be equipped with embedded steel bar 111 in precast beam 11, embedded steel bar 111 is implanted when pouring precast beam 11, reserve out the weld part, embedded steel bar 111 welds with anchor steel sheet 121 through anchor steel bar 122, anchor steel bar 122 is located anchor body 12, anchor steel sheet 121 is located the upper end right side of anchor body 12, anchor body 12 includes first anchor body 123 and second anchor body 124, first anchor body 123 is located second anchor body 124 downside, first anchor body 123 is ultra high performance concrete structure, second anchor body 124 is the steel fibre concrete structure, preferably, the anchor steel sheet is shaped steel.
The ultra-high performance concrete UHPC is a cement-based composite material which has excellent impermeability, tensile and compressive properties and can have apparent strain hardening or softening behavior. Wherein the diffusion coefficient of chloride ions should not be more than 20 x 10-14m2And/s, the ultimate tensile strength of elasticity is not less than 5MPa, and the compressive strength is not less than 120 MPa. Relevant standards of UHPC are established in France, Switzerland, Japan and the United states, and the China Association of building materials establishes the standard of ultra-high performance concrete-the technical standard of ultra-high performance concrete: basic Performance and test methods. The water-cement ratio is extremely low, the concrete is prepared according to the maximum bulk density principle, the steel fiber is added to obtain excellent mechanical properties, and the bending and tensile properties of the member are excellent after the thickness of the member is reduced to 1-2cm, so that the concrete is internationally acknowledged as the next generation of concrete.
The following results are obtained through indoor and model experiments of the inventor:
1. the ultra-high performance concrete has high cohesiveness, and the interface is no longer a weak link of damage when UHPC is used for bonding the concrete;
2. the ultra-high performance concrete has good fluidity, a glass-made die in a shape like a Chinese character 'kou' is fixed on a test beam web plate so as to observe the flow state of UHPC during pouring, the long side of the die in the shape like the Chinese character 'kou' is 1.3 meters, the short side (height direction) is 0.7 meter, the width of a concrete flow channel is 10cm, the thickness is 1.5cm, namely in a narrow channel with the thickness of 1.5cm and the width of 10cm, the UHPC flows for 4 meters along the direction indicated by an arrow, and turns 3 right-angled bends after a climbing stage with the height of 70cm, and during pouring, the UHPC slowly flows along the designed route; after the mould is removed, measuring that the height difference between the final flowing surface and the pouring surface is only 5 cm;
3. the ultra-high performance concrete structure has excellent fatigue resistance and impact resistance. The main reasons are as follows: 1) the UHPC does not contain coarse aggregate, and the stress concentration in the material is obviously reduced; 2) the UHPC is doped with steel fibers, and the fibers which are uniformly distributed can effectively prevent the fatigue cracks from growing and penetrating. 3) The steel fiber and the cement matrix have stronger bonding strength, so that the fatigue resistance can be further improved;
in the second embodiment, as shown in fig. 1, on the basis of the first embodiment, the embedded bars 111 are of an L-shaped structure, the lower ends of the embedded bars 111 are transversely embedded in the precast beam 11, and the upper ends of the embedded bars 111 are vertically and upwardly welded to the anchoring bars in the anchoring bodies 12, so that the firmness of the embedded bars 111 can be improved, and the embedded bars 111 can be effectively prevented from loosening and falling off. At present, the expansion joint anchoring concrete of the bridge generally adopts C50 concrete or steel fiber concrete with single component, and is easy to damage, and the analysis reasons comprise that the anchoring concrete shrinks and cracks, the concrete under the expansion joint profile steel is not compact (forms a cantilever structure), the anchoring steel bars are not firmly welded, the expansion joint concrete is not firmly bonded with the original beam, and the like. In order to reduce the shrinkage cracking of concrete, fiber is required to be added and the water consumption is low, so that the concrete state is poor and the section steel is easy to be not compact. According to the structure, the first anchoring body 123 (ultra-high performance concrete) is poured to the anchoring steel plate 121, and due to the fact that the ultra-high performance concrete is good in flowability, the situation that concrete under the expansion joint anchoring steel plate is not compact can be effectively prevented; because the ultrahigh-performance concrete has good viscosity, good fatigue resistance, good impact resistance and good explosion resistance, and can prevent the expansion joint concrete from being bonded with the original beam, the second anchoring body 124 can use the concrete with fibers and lower water consumption, and can reduce the shrinkage cracking of the concrete.
In the third embodiment, as shown in fig. 1, on the basis of the first embodiment, the embedded bars 111 are of an L-shaped structure, the lower ends of the embedded bars 111 are transversely embedded in the precast beam 11, and the upper ends of the embedded bars 111 are vertically and upwardly welded to the anchoring bars in the anchoring bodies 12, so that the firmness of the embedded bars 111 can be improved, and the embedded bars 111 can be effectively prevented from loosening and falling off. The anchoring steel plate 121 is L-shaped steel, the anchoring steel plate 121 includes a first side plate 1211 and a second side plate 1212, the first side plate 1211 is close to the bridge seam 20, and the second side plate 1212 is welded to the anchoring steel bar 122. First curb plate 1211 level is placed, and second curb plate 1212 is vertical to be placed, and the L type notch of anchor steel sheet 121 is towards bridge seam 20, and anchor reinforcing bar 122 bends according to actual demand, makes and welds on same vertical face with first curb plate 1211, also welds on same vertical face with embedded steel bar 111, and this structure can make anchor reinforcing bar 122 and anchor steel sheet 121 and embedded steel bar 111's contact surface bigger, and the welding point is more, and the welding is more firm. The first anchor 123 is located at a lower side of the anchor steel plate 121, the anchor steel plate 121 is located inside the second anchor 124, and the first anchor 123 is connected with the second anchor 124. Preferably, the height of the first anchor body 123 is 80% of the height of the anchor body 12, and the anchor body 12 under this weight can make the concrete under the expansion joint anchoring steel plate compact, and the expansion joint concrete is firmly bonded with the original beam. The height of the second anchor 124 is 20% of the height of the anchor 12, and the anchor 12 in this amount can make the surface of the anchored concrete not easy to shrink and crack. The number of the bridge bodies 10 is two, and the two bridge bodies 10 are connected through a sealing strip 30; alternatively, one of the bridge bodies 10 is connected to the abutment by a seal 30. The sealing strip 30 is mainly used for water and dust prevention, and is used for preventing sundries from entering gaps and influencing expansion and contraction.
In the fourth embodiment, as shown in fig. 2, based on the first, second and third embodiments, the height of the first anchoring body 123 is 15% of the height of the anchoring body 12, and this structure can prevent the expansion joint concrete from being bonded to the original beam poorly due to the good adhesion, good fatigue resistance, good impact resistance and good explosion resistance of the ultra-high performance concrete at the lower layer, so that the second anchoring body 124 can use concrete with additional fiber and lower water consumption, and can reduce the concrete shrinkage cracking. Meanwhile, a small amount of ultra-high performance concrete is used, so that the construction cost can be reduced.
In practical application, the construction steps of the expansion joint anchoring structure are as follows: firstly, chiseling the surface of a precast beam 11 to expose aggregate as much as possible; secondly, welding the anchoring steel plate 121 with the embedded steel bars 111 through the anchoring steel bars 122; thirdly, cleaning welding slag and sundries, washing the welding slag and the sundries clean by a high-pressure water gun, and blowing open water by a fire-fighting air gun; sealing the template, namely using a thin wood plate as the template, and filling gaps with foaming glue, so as to prevent the template from expanding and leaking during vibration; fifthly, pouring ultrahigh-performance concrete, wherein the pouring starts from the highest position of the cross slope, and the two sides of the expansion joint device are alternately poured to reach the designed depth; and sixthly, pouring steel fiber concrete, avoiding the impact of the steel fiber concrete pouring on the ultra-high performance concrete layer as much as possible, arranging a baffle on the expansion joint device, unloading the common concrete to the baffle for buffering, dispersing the common concrete into the expansion joint slot by using a rake, and vibrating, plastering and maintaining the common concrete after pouring according to a conventional mode.
In the fifth embodiment, as shown in fig. 3, based on the first, second and third embodiments, the anchor steel plate a125 includes a first side plate a1251 and a second side plate a1252, the first side plate a1251 is perpendicularly connected to the second side plate a1252, the second side plate a1252 is welded to the anchor steel bar 122, the first side plate a1251 is flush with the asphalt layer 13, and the second side plate a1252 is in contact with the bridge gap 20.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a bridge expansion joint anchor structure, includes the bridge body and bridge seam, its characterized in that:
the bridge seam is positioned between the bridge bodies, each bridge body comprises a precast beam and an anchoring body, an asphalt surface layer is paved on one side of the upper end of each precast beam, and the anchoring body is positioned on the other side of the upper end of each precast beam; the prefabricated beam is internally provided with embedded steel bars, the embedded steel bars are connected with an anchoring steel plate through anchoring steel bars, the anchoring steel bars are arranged in the anchoring bodies, the anchoring steel plate is located at the upper end of the anchoring bodies and close to one side of the bridge seam, each anchoring body comprises a first anchoring body and a second anchoring body, the first anchoring bodies are located at the lower sides of the second anchoring bodies, the first anchoring bodies are of ultra-high performance concrete (UHPC) structures, and the second anchoring bodies are C50 steel fiber concrete.
2. The bridge expansion joint anchoring structure according to claim 1, wherein:
the embedded steel bars comprise first steel bars and second steel bars, the first steel bars are connected with the second steel bars at preset angles, and one ends of the embedded steel bars are connected with the anchoring steel bars along the axis direction of the bridge seams.
3. The bridge expansion joint anchoring structure according to claim 2, wherein:
the anchoring steel plate comprises a first side plate and a second side plate, the first side plate and the second side plate are connected at a preset angle, the first side plate is close to the bridge seam, and the second side plate is connected with the anchoring steel bars.
4. The bridge expansion joint anchoring structure according to claim 3, wherein:
the length direction of the first side plate is consistent with the axis direction of the bridge seam, and the second side plate is perpendicularly connected with the first side plate.
5. The bridge expansion joint anchoring structure according to claim 3, wherein:
the length direction of the first side plate is perpendicular to the axis direction of the bridge seam, and the second side plate is perpendicularly connected with the first side plate.
6. The bridge expansion joint anchoring structure according to claim 3, wherein:
the first anchoring body is located on the lower side of the bottom end face of the anchoring steel plate, the second anchoring body is located on the upper side of the bottom end face of the anchoring steel plate, and the first anchoring body is connected with the second anchoring body.
7. The bridge expansion joint anchoring structure according to claim 3, wherein:
the first anchoring body is located on the lower side of the anchoring steel plate, the anchoring steel plate is located inside the second anchoring body, and the first anchoring body is connected with the second anchoring body.
8. The bridge expansion joint anchoring structure according to claim 1, wherein:
the first anchor height is 80% of the anchor height.
9. The bridge expansion joint anchoring structure according to claim 1, wherein:
the first anchor height is 15% of the anchor height.
10. The bridge expansion joint anchoring structure according to any one of claims 1 to 9, wherein:
the bridge body has two, two the bridge body passes through the sealing strip and connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920487909.2U CN209975357U (en) | 2019-04-11 | 2019-04-11 | Bridge expansion joint anchoring structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920487909.2U CN209975357U (en) | 2019-04-11 | 2019-04-11 | Bridge expansion joint anchoring structure |
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| CN209975357U true CN209975357U (en) | 2020-01-21 |
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| CN201920487909.2U Expired - Fee Related CN209975357U (en) | 2019-04-11 | 2019-04-11 | Bridge expansion joint anchoring structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430924A (en) * | 2021-07-05 | 2021-09-24 | 山西省交通新技术发展有限公司 | Precast beam end expansion joint anchoring system |
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2019
- 2019-04-11 CN CN201920487909.2U patent/CN209975357U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430924A (en) * | 2021-07-05 | 2021-09-24 | 山西省交通新技术发展有限公司 | Precast beam end expansion joint anchoring system |
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