CN114922125A - PC beam type bridge, and reinforcing device and method for PC beam type bridge - Google Patents
PC beam type bridge, and reinforcing device and method for PC beam type bridge Download PDFInfo
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- CN114922125A CN114922125A CN202210494954.7A CN202210494954A CN114922125A CN 114922125 A CN114922125 A CN 114922125A CN 202210494954 A CN202210494954 A CN 202210494954A CN 114922125 A CN114922125 A CN 114922125A
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 227
- 239000010959 steel Substances 0.000 claims abstract description 227
- 230000007246 mechanism Effects 0.000 claims abstract description 73
- 238000004873 anchoring Methods 0.000 claims abstract description 35
- 239000004567 concrete Substances 0.000 claims description 20
- 230000002787 reinforcement Effects 0.000 claims description 20
- 230000035939 shock Effects 0.000 claims description 13
- 239000003292 glue Substances 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 7
- 239000011513 prestressed concrete Substances 0.000 description 40
- 239000006096 absorbing agent Substances 0.000 description 9
- 238000009434 installation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H5/00—Removing snow or ice from roads or like surfaces; Grading or roughening snow or ice
- E01H5/10—Removing snow or ice from roads or like surfaces; Grading or roughening snow or ice by application of heat for melting snow or ice, whether cleared or not, combined or not with clearing or removing mud or water, e.g. burners for melting in situ, heated clearing instruments; Cleaning snow by blowing or suction only
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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
- E01D19/00—Structural or constructional details of bridges
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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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
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The invention discloses a PC beam bridge, a reinforcing device and a method thereof, wherein the reinforcing device of the PC beam bridge comprises a steel box, an anchor cable device and a steering steel cushion block, the steel box is arranged at the bottom of a box girder, the anchor cable device comprises an anchoring mechanism arranged at the top of the box girder, a tensioning mechanism arranged at the bottom of the steel box and a steel strand which penetrates through the box girder and the steel box and is connected with the anchoring mechanism and the tensioning mechanism, the steering steel cushion block is provided with two steel strands which are respectively arranged on the box girder and the steel box, and the steering steel cushion block is used for being matched with the anchoring mechanism and the tensioning mechanism so as to adjust the inclination angle of the tensioned steel strand. The reinforcing device for the PC beam type bridge has the advantages of preventing a box girder web plate from cracking, prolonging the service life of the bridge, along with good reinforcing effect, low cost, wide application range and convenience in construction.
Description
Technical Field
The invention relates to the technical field of bridge reinforcement, in particular to a PC beam bridge, a reinforcement device and a reinforcement method of the PC beam bridge.
Background
At present, the Prestressed Concrete (PC) beam bridge of the existing railway and highway bears larger traffic, the heavy-duty vehicles are increased day by day, various diseases are gradually shown, and various diseases, particularly the oblique cracking of a web plate, are gradually shown, so that the safe use of the existing bridge is seriously influenced. The oblique cracking problem of the beam body is caused by the fact that the load standard of a PC beam type bridge constructed in an early stage is low, and most of web plates are not provided with longitudinal downward bending beams and vertical beams, so that the oblique cracking caused by insufficient shearing resistance and bearing capacity of the web plates is caused. According to incomplete statistics, the existing iron and highway PC beam type bridge body often has an oblique crack on a web plate, and the oblique crack and the beam axis form a 25-50 degree angle. Even if the longitudinal downward bending beam and the vertical beam are arranged, the residual prestress loss is overlarge after long-term operation, and the influence factors include limitation of the tension condition at the time and insufficient prestress tension value; the prestressed rib corrugated pipe is inaccurate in positioning, and the grouting of the pipeline is not compact; the shrinkage and creep of the concrete are not considered enough; insufficient web thickness, etc. Concrete is poured into the box girder of the support in the midspan direction, the shear bearing capacity can be improved by increasing the thickness of the web plate section, but the concrete poured by the method is large in volume and is not suitable for the box girder bridge, the dead weight of the reinforced bridge is increased, and the reinforcing effect is poor. Finally, dismantling and rebuilding are often adopted, which undoubtedly causes great pollution to the environment and increases costs.
Disclosure of Invention
The present invention is directed to solving, at least in part, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides the reinforcing device for the PC beam type bridge, which has the advantages of avoiding the cracking of a box girder web, prolonging the service life of the bridge, along with good reinforcing effect, low cost, wide application range and convenience in construction.
According to the reinforcing device of the PC girder bridge, the reinforcing device of the PC girder bridge comprises a steel box, an anchor cable device and two steering steel cushion blocks, the steel box is arranged at the bottom of a box girder, the anchor cable device comprises an anchoring mechanism arranged at the top of the box girder, a tensioning mechanism arranged at the bottom of the steel box and steel strands penetrating through the box girder and the steel box and connected with the anchoring mechanism and the tensioning mechanism, the two steering steel cushion blocks are respectively arranged on the box girder and the steel box, and the steering steel cushion blocks are used for being matched with the anchoring mechanism and the tensioning mechanism so as to adjust the inclination angle of the tensioned steel strands.
The reinforcing device of the PC beam type bridge has the advantages of preventing the box girder web from cracking, prolonging the service life of the bridge, being good in reinforcing effect, low in cost, wide in application range and convenient and fast to construct.
In some embodiments, the steel case includes steel case roof, steel case web, steel case bottom plate and floor, the steel case roof sets up the bottom of case roof beam, steel case web one end with the steel case roof links to each other, the steel case web other end with the steel case bottom plate links to each other, the steel case roof with the steel case bottom plate all be equipped with the first perforation of straining device complex, the floor with the steel case web links to each other, the extending direction of floor with the extending direction of steel strand wires is unanimous.
In some embodiments, the steel box further comprises an extension plate, the extension plate is connected with the steel box top plate and arranged on two sides of the steel box top plate, and the extension plate is provided with a plurality of connecting holes used for being connected with the box girder.
In some embodiments, the anchoring mechanism includes a first anchor head, a first sleeve and a shock absorber, the first sleeve is connected to the box girder top plate, one of the steering steel cushion blocks is arranged on the upper surface of the box girder top plate and connected to the top of the first sleeve, the shock absorber is arranged at the bottom of the first sleeve, one end of the first anchor head penetrates through the first sleeve and is connected to the steering steel cushion block, the other end of the first anchor head is connected to a steel strand, and the steel strand penetrates through the shock absorber and is connected to the tensioning mechanism.
In some embodiments, the tensioning mechanism includes a second anchor head, a second sleeve and a tensioning block, the second sleeve passes through the steel box, another turns to the steel pad and establishes the lower surface of the steel box bottom plate and links to each other with the bottom of the second sleeve, the shock absorber is established inside the second sleeve top, second anchor head one end is worn out the second sleeve and is linked to each other with turn to the steel pad, the steel strand is connected to the second anchor head other end, the steel strand passes the shock absorber and links to each other with the anchoring mechanism, the tensioning block is arranged at the second anchor head is close to the one end of the steel box bottom plate.
In some embodiments, the tensioning mechanism further comprises a waterproof cover provided outside an end of the second sleeve adjacent to the steel box top panel.
In some embodiments, the steering steel pad block is an irregular hexahedron including a contact surface for contacting the box girder or the steel box, a pressure-bearing surface for contacting the anchoring mechanism or the tensioning mechanism.
According to the reinforcing method of the PC beam bridge provided by the embodiment of the invention, the reinforcing method of the PC beam bridge comprises the following steps: installing a steel box below the box girder; arranging a plurality of cavities on the box girder top plate at the points of L/8, 3L/16, L/4, 5L/16, 3L/8, 11L/16, 3L/4, 13L/16, 7L/8 and 15L/16 of the box girder, placing an anchoring mechanism into the cavities, connecting steel strands with the anchoring mechanism, and pouring concrete into the cavities until the concrete is flush with the bridge deck; and connecting the steel strand with the tensioning mechanism, and installing the tensioning mechanism at the lower part of the steel box bottom plate to tension the steel strand.
In some embodiments, after the bar planting glue is poured into the connecting hole of the epitaxial plate of the steel box, the fixing bolt is screwed into the connecting hole, and the steel box and the box girder bottom plate are fixed after the bar planting glue is cured.
The PC beam type bridge comprises box beams and reinforcing devices, wherein the reinforcing devices are arranged at the points of L/8, 3L/16, L/4, 5L/16, 3L/8, 11L/16, 3L/4, 13L/16, 7L/8 and 15L/16 of the box beams.
Drawings
FIG. 1 is a front view of a PC beam bridge according to an embodiment of the present invention.
FIG. 2 is a schematic view of a cross section A-A of a PC beam bridge according to an embodiment of the present invention.
Figure 3 is a right side view of a steel box of a reinforcement device for a PC beam bridge according to an embodiment of the present invention.
Figure 4 is a top view of a steel box of a reinforcement device for a PC beam bridge according to an embodiment of the present invention.
Figure 5 is a front view of a steel box of a reinforcement device for a PC beam bridge according to an embodiment of the present invention.
FIG. 6 is a schematic diagram of the structure of a steering steel pad of a reinforcement device of a PC beam bridge according to an embodiment of the present invention.
Fig. 7 is a schematic cross-sectional view of an anchoring mechanism of a reinforcement device for a PC beam bridge according to an embodiment of the present invention.
Fig. 8 is a schematic cross-sectional view of a tensioning mechanism of a reinforcement device for a PC beam bridge according to an embodiment of the present invention.
FIG. 9 is a schematic illustration of I-beam reinforcement of a PC beam bridge according to an embodiment of the present invention.
Figure 10 is a schematic illustration of straight web concrete box girder reinforcement of a PC beam bridge according to an embodiment of the present invention.
FIG. 11 is a schematic illustration of T-beam reinforcement of a PC beam bridge according to an embodiment of the present invention.
Reference numerals: 1. a steel box; 11. a steel box top plate; 12. a steel box web; 13. a steel box bottom plate; 14. a rib plate; 15. an epitaxial plate; 2. an anchoring mechanism; 21. a first anchor head; 22. a first sleeve; 3. a tensioning mechanism; 31. a second anchor head; 32. a second sleeve; 33. a tensioning block; 34. a waterproof cover; 4. a steering steel cushion block; 5. a damper; 6. steel strand wires; 7. a box girder; 71. a box girder top plate; 72. a box girder bottom plate; 73. a box girder web; 8. a ball nut; 9. and fixing the bolt.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
In order to improve the shear-resistant bearing capacity of the PC beam bridge, carbon fiber composite materials are often adhered to the lower part of a bottom plate of the PC beam bridge or an outer beam is additionally arranged inside and outside a box to enhance the bearing capacity, but the effect of improving the shear-resistant bearing capacity of the cross section by the method is not obvious. In addition, the steel bars with the angle of 45 degrees are implanted into the support in the midspan direction to improve the shearing resistance of the reinforced concrete simply-supported beam, but for the inclined-web PC simply-supported box girder bridge with the prestressed bundles arranged on the web plate, the method needs to penetrate the whole web plate to avoid the prestress of the web plate, and the construction difficulty is very high. Moreover, the bearing seat is poured with concrete into the box girder in the midspan direction, the shear bearing capacity can be improved by increasing the thickness of the section of the web plate, but the method is large in poured concrete, not suitable for the box girder bridge, and poor in reinforcing effect due to the fact that the dead weight of the reinforced bridge is increased. Finally, dismantling and rebuilding are often adopted, which undoubtedly causes great pollution to the environment and increases costs.
According to the reinforcing device of the PC beam bridge of the embodiment of the invention, as shown in figures 1-11, the reinforcing device of the PC beam bridge comprises a steel box 1, an anchor cable device and two steering steel cushion blocks 4, wherein the steel box 1 is arranged at the bottom of a box girder 7, the anchor cable device comprises an anchoring mechanism 2 arranged at the top of the box girder 7, a tensioning mechanism 3 arranged at the bottom of the steel box 1 and a steel strand 6 which penetrates through the box girder 7 and the steel box 1 and is connected with the anchoring mechanism 2 and the tensioning mechanism 3, the number of the steering steel cushion blocks 4 is two, the two steering steel cushion blocks 4 are respectively arranged on the box girder 7 and the steel box 1, and the two steering steel cushion blocks 4 are identical in shape and different in position. The steering steel cushion block 4 is used for being matched with the anchoring mechanism 2 and the tensioning mechanism 3 so as to adjust the inclined angle of the steel strand 6 after tensioning. The steel box 1 is fixed at a box girder bottom plate 72 of the beam type bridge through a fixing bolt 9, holes for the steel stranded wires 6 to penetrate through are drilled at corners of an outer extension plate 15 and a box girder web 73 of the beam type bridge in an inclined mode, the steel stranded wires 6 penetrate through a box girder top plate 71, the steel box 1 and two steering steel cushion blocks 4, the steel stranded wires 6 from a support of the beam type bridge to a span are sequentially tensioned and fixed, and the shear-resistant bearing capacity of the PC beam type bridge is improved by applying prestress on the box girder 7. The PC beam bridge stretches the steel strand 6 through the anchor cable device, so that the main stress of the cross section of the box girder web 73 is reduced, the oblique cross section of the box girder web 73 is prevented from cracking, the service life of the bridge is prolonged, and the cost is reduced. The anchor cable device and the steel box 1 are simple in structure and stress can be adjusted according to different cross section shapes of the PC beam bridge, installation and construction are convenient, and reinforcing transformation construction operation can be carried out under the condition that traffic is not closed.
The reinforcing device of the PC beam type bridge has the advantages of avoiding the cracking of the box girder web, prolonging the service life of the bridge, reducing the cost, along with wide application range and convenient construction.
In some embodiments, as shown in fig. 1 to 5, the steel box 1 includes a steel box top plate 11, a steel box web 12, a steel box bottom plate 13, and a rib plate 14, the top plate 11 is disposed at the bottom of the box girder 7, one end of the steel box web 12 is connected to the steel box top plate 11, the other end of the steel box web 12 is connected to the steel box bottom plate 13, both the steel box top plate 11 and the steel box bottom plate 13 are provided with a first through hole matched with the tensioning mechanism 3, the rib plate 14 is connected to the steel box web 12, and an extending direction of the rib plate 14 is consistent with an extending direction of the steel strand 6.
Specifically, a bolt hole is reserved in the steel box top plate 11, the steel strand 6 penetrates through a first through hole of the steel box top plate 11 and a first through hole of the steel box bottom plate 13, two steel box web plates 12 are welded with the steel box top plate 11 and the steel box bottom plate 13, six rib plates 14 which are obliquely arranged are respectively welded on the steel box web plates 12, the six rib plates 14 are divided into two groups, three rib plates 14 which are parallel to each other in one group are consistent with the extending direction of the steel strand 6, three rib plates 14 in the other group are symmetrically distributed relative to the center line of the steel box top plate 11, the distances between the rib plates 14 are equal, and the steel box bottom plate 13 is parallel to the steel box top plate 11.
In some embodiments, as shown in fig. 3-5, the steel box 1 further comprises an extension plate 15, the extension plate 15 is connected to the steel box top plate 11 and is disposed on both sides of the steel box top plate 11, and the extension plate 15 is provided with a plurality of connecting holes for connecting to the box girders 7.
Specifically, the epitaxial plates 15 are welded on two sides of the steel box top plate 11, the thickness of the epitaxial plates 15 is the same as that of the steel box top plate 11, the upper surface of the epitaxial plates 15 is coplanar with that of the steel box top plate 11, the temporary fixing bolts 9 are connected with the box girder bottom plate 72 through the connecting holes of the epitaxial plates 15, and bar planting glue can be poured into the connecting holes and nuts are screwed to fix the steel box 1.
In some embodiments, as shown in fig. 6, the anchoring mechanism 2 includes a first anchor head 21, a first sleeve 22 and a damper 5, the first sleeve 22 is connected to the box girder top plate 71, one of the steering steel pad blocks is disposed on the upper surface of the box girder top plate 71 and connected to the top of the first sleeve 22, the damper 5 is disposed at the bottom of the first sleeve 22, one end of the first anchor head 21 penetrates through the first sleeve 22 and is connected to the steering steel pad block 4, the other end of the first anchor head 21 is connected to the steel strand 6, and the steel strand 6 penetrates through the damper 5 and is connected to the tensioning mechanism 3.
Specifically, the anchoring mechanism 2 is located in a concrete cavity formed by chiseling a box girder top plate 71, the first anchor head 21 is provided with an outer wire and located in the extending direction of the steel strand 6, one end of the first anchor head 21 is provided with a cavity for placing and connecting the steel strand 6, the other end of the first anchor head 21 is connected with the spherical nut 8, the spherical nut 8 is provided with an inner wire, the spherical nut 8 is in threaded connection with the first anchor head 21, the spherical nut 8 is screwed to fix the first anchor head 21 on the steering steel cushion block 4, the top of the first sleeve 22 is connected with the steering steel cushion block 4, the outer surface of the first sleeve 22 is in contact with and fixed to the concrete, the bottom end of the first sleeve 22 is connected with the shock absorber 5, the steel strand 6 penetrates through the shock absorber 5, and the steel strand 6 is formed by twisting a plurality of steel wires. And after the anchoring mechanism 2 is installed, pouring concrete into the concrete cavity, wherein the upper top surface of the concrete is flush with the bridge floor. First sleeve 22 can avoid steel strand wires 6 and concrete or box girder 7 direct contact, and then avoids reducing the effective prestressing force of steel strand wires 6 because of dynamic load produces wearing and tearing, and first sleeve 22 can also prevent that sleet from getting into the effective prestressing force that corrodes steel strand wires 6 or first anchor head 21 reduces steel strand wires 6 from steel case 1 side, and first sleeve 22 is easy to assemble steel strand wires 6 and stretch-draw steel strand wires 6.
In some embodiments, as shown in fig. 7, the tensioning mechanism 3 comprises a second anchor head 31, a second sleeve 32 and a tensioning block 33, the second sleeve 32 penetrates through the steel box 1, another steering steel pad block is arranged on the lower surface of the bottom plate 13 of the steel box 1 and connected with the bottom of the second sleeve 32, the shock absorbing body 5 is arranged on the inner side of the top of the second sleeve 32, one end of the second anchor head 31 penetrates through the second sleeve 32 and is connected with the steering steel pad block 4, the other end of the second anchor head 31 is connected with the steel strand 6, the steel strand 6 penetrates through the shock absorbing body 5 and is connected with the anchoring mechanism 2, and the tensioning block 33 is arranged at one end of the second anchor head 31 adjacent to the bottom plate of the steel box 1.
Specifically, the tensioning mechanism 3 is located on the lower portion of the steel box bottom plate 13, the second anchor head 31 is provided with an outer wire and located in the extending direction of the steel strand 6, one end of the second anchor head 31 is provided with a cavity for placing and connecting the steel strand 6, the other end of the second anchor head 31 is connected with the spherical nut 8, the spherical nut 8 is provided with an inner wire, the spherical nut 8 is in threaded connection with the second anchor head 31, the spherical nut 8 is screwed to fix the second anchor head 31 on the steering steel cushion block 4, the bottom portion of the second sleeve 32 is connected with the steering steel cushion block 4, the outer surface of the second sleeve 32 is in contact with and fixed to concrete, the top portion of the second sleeve 32 is connected with the shock absorber 5, the steel strand 6 penetrates through the shock absorber 5, and the steel strand 6 is formed by stranding a plurality of steel wires. The second sleeve 32 can avoid steel strand 6 and concrete or box girder 7 direct contact, and then avoids producing the effective prestressing that wearing and tearing reduced steel strand 6 because of the dynamic load, and the second sleeve 32 can also prevent that sleet from getting into the effective prestressing that corrodes steel strand 6 or first anchor head 21 reduces steel strand 6 from the steel case 1 side, and second sleeve 32 is easy to assemble steel strand 6 and stretch-draw steel strand 6. The first sleeve 22 and the second sleeve 32 are identical in construction and are positioned differently.
In some embodiments, as shown in fig. 7, the tensioning mechanism 3 further comprises a waterproof cover 34, the waterproof cover 34 being provided outside an end of the second sleeve 32 adjacent to the top plate of the steel box 1.
In some embodiments, as shown in fig. 6, the steering steel pad 4 is a regular hexahedron including a contact surface for contacting the box girder 7 or the steel box 1, a pressure bearing surface for contacting the anchoring mechanism 2 or the tension mechanism 3.
Specifically, turn to steel cushion 4 and support through machining or wire-electrode cutting processing, turn to steel cushion 4 and can adjust the inclination after 6 steel strands stretch-draw, realize that anchor rope device and case roof beam 7 vertically are 45, transversely are certain contained angle with case roof beam 7, turn to steel cushion simultaneously and can increase the bearing area of steel case bottom plate 13 and case roof beam roof plate 71, prevent that steel case bottom plate 13 local deformation is too big and case roof beam roof plate 71 local crushing.
According to the reinforcing method of the PC beam bridge provided by the embodiment of the invention, the reinforcing method of the PC beam bridge comprises the following steps: installing a steel box 1 below the box girder; arranging a plurality of cavities on box girder top plates 71 at points of L/8, 3L/16, L/4, 5L/16, 3L/8, 11L/16, 3L/4, 13L/16, 7L/8 and 15L/16 of the box girder, placing the anchoring mechanisms 2 into the cavities, connecting the steel strands 6 with the anchoring mechanisms 2, and pouring concrete into the cavities until the concrete is flush with the bridge deck; and connecting the steel strand 6 with the tensioning mechanism 3, and installing the tensioning mechanism 3 at the lower part of the bottom plate of the steel box 1 to tension the steel strand 6. The position of the anchoring mechanism 2 is determined according to the positions of a plurality of branch points of the box girder, and L is the span of the box girder. The steel box 1 and the tensioning mechanism 3 are combined with the steel strand 6 which penetrates out along the direction of 45 degrees with the beam axis of the box girder along the outer side of the box girder web plate and the position data of the anchoring mechanism to determine the installation positions of the steel box 1 and the tensioning mechanism 3. The order of installation of the anchoring mechanism 2 and the steel tank 1 can be interchanged.
Therefore, the tension mechanism and the anchoring mechanism provide prestress for the beam bridge, on one hand, oblique force is provided for preventing further cracking of the oblique cracks, the oblique cracks of the box girder web plate are tightly combined, on the other hand, vertical force is provided for offsetting the gravity of a part of the box girder so as to relieve the cracking of the oblique cracks of the box girder web plate.
In some embodiments, after the bar-planting glue is poured into the connecting hole of the extension plate 15 of the steel box 1, the fixing bolt 9 is screwed into the connecting hole, and the steel box 1 is fixed with the box girder bottom plate 72 after the bar-planting glue is cured.
Therefore, the steel box and the box girder bottom plate are better fixed by matching the embedded bar glue and the fixing bolts, and the structural strength is convenient to enhance.
The PC beam type bridge comprises box beams and reinforcing devices, wherein the reinforcing devices are arranged at the branch points of L/8, 3L/16, L/4, 5L/16, 3L/8, 11L/16, 3L/4, 13L/16, 7L/8 and 15L/16 of the box beams. The anchoring means 2 of the reinforcement device are arranged at a plurality of points of the box girder.
The technical advantages of the PC beam bridge according to the embodiments of the present invention are the same as those of the above-described PC beam bridge reinforcing apparatus, and are not described herein again.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are illustrative and not to be construed as limiting the present invention and that many changes, modifications, substitutions and alterations can be made in the above embodiments by one of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A reinforcement for a PC beam bridge, comprising:
the steel box is arranged at the bottom of the box girder;
the anchor cable device comprises an anchoring mechanism arranged at the top of the box girder, a tensioning mechanism arranged at the bottom of the steel box and a steel strand penetrating through the box girder and the steel box and connecting the anchoring mechanism and the tensioning mechanism; and
the steel box comprises two steering steel cushion blocks, wherein the two steering steel cushion blocks are respectively arranged on the box beam and the steel box, and the steering steel cushion blocks are used for being matched with the anchoring mechanism and the tensioning mechanism so as to adjust the inclination angle of the steel strand after tensioning.
2. The reinforcement device for a PC girder bridge according to claim 1, wherein the steel box includes a steel box top plate, a steel box web, a steel box bottom plate, and a rib plate, the steel box top plate is disposed at the bottom of the box girder, one end of the steel box web is connected to the steel box top plate, the other end of the steel box web is connected to the steel box bottom plate, the steel box top plate and the steel box bottom plate are each provided with a first through hole engaged with the tension mechanism, the rib plate is connected to the steel box web, and an extending direction of the rib plate coincides with an extending direction of the steel strand.
3. The reinforcement for a PC beam bridge as defined in claim 2, wherein said steel box further includes extension plates connected to and disposed on both sides of said steel box top plate, said extension plates being provided with a plurality of connection holes for connection to said box girder.
4. The PC girder bridge reinforcement device of claim 2, wherein the anchoring mechanism includes a first anchor head, a first sleeve and a damper, the first sleeve is connected to a box girder top plate, one of the steering steel pads is disposed on an upper surface of the box girder top plate and connected to a top of the first sleeve, the damper is disposed at a bottom of the first sleeve, one end of the first anchor head passes through the first sleeve and is connected to the steering steel pad, the other end of the first anchor head is connected to a steel strand, and the steel strand passes through the damper and is connected to the tension mechanism.
5. The reinforcement apparatus for a PC girder bridge according to claim 4, wherein the tension mechanism includes a second anchor head, a second sleeve and a tension block, the second sleeve penetrates the steel box, another of the steering steel pads is provided on a lower surface of the bottom plate of the steel box and is connected to a bottom of the second sleeve, the shock absorbing body is provided inside a top of the second sleeve, one end of the second anchor head penetrates the second sleeve and is connected to the steering steel pad, the other end of the second anchor head is connected to a steel strand, the steel strand penetrates the shock absorbing body and is connected to the anchor mechanism, and the tension block is provided at an end of the second anchor head adjacent to the bottom plate of the steel box.
6. The reinforcement for a PC beam bridge of claim 5, wherein the tensioning mechanism further comprises a waterproof shield positioned outside an end of the second sleeve adjacent the top deck of the steel box.
7. The PC girder bridge reinforcement device of claim 1, wherein the steering steel pad block is a regular hexahedron including a contact surface for contacting the box girder or the steel box, and a pressure-bearing surface for contacting the anchoring mechanism or the tension mechanism.
8. A method for reinforcing a PC beam bridge is characterized by comprising the following steps:
installing a steel box below the box girder;
arranging a plurality of cavities on the box girder top plate at the points of L/8, 3L/16, L/4, 5L/16, 3L/8, 11L/16, 3L/4, 13L/16, 7L/8 and 15L/16 of the box girder, placing an anchoring mechanism into the cavities, connecting steel strands with the anchoring mechanism, and pouring concrete into the cavities until the concrete is flush with the bridge deck;
and connecting the steel strand with the tensioning mechanism, and installing the tensioning mechanism at the lower part of the steel box bottom plate to tension the steel strand.
9. The method for reinforcing a PC beam bridge of claim 8, wherein a fixing bolt is screwed into the connecting hole after a bar-planting glue is poured into the connecting hole of the extension plate of the steel box, and the steel box and the box beam bottom plate are fixed after the bar-planting glue is cured.
10. A PC beam bridge comprising a box girder and reinforcing means provided at the branching points of L/8, 3L/16, L/4, 5L/16, 3L/8, 11L/16, 3L/4, 13L/16, 7L/8 and 15L/16 of the box girder, the reinforcing means being a reinforcing means of a PC beam bridge as claimed in any one of claims 1 to 7.
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| CN202210494954.7A CN114922125A (en) | 2022-05-07 | 2022-05-07 | PC beam type bridge, and reinforcing device and method for PC beam type bridge |
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| CN202210494954.7A CN114922125A (en) | 2022-05-07 | 2022-05-07 | PC beam type bridge, and reinforcing device and method for PC beam type bridge |
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Application publication date: 20220819 |