CN111236095A - External prestress reinforcing structure and method for prestressed concrete slab girder of highway bridge - Google Patents
External prestress reinforcing structure and method for prestressed concrete slab girder of highway bridge Download PDFInfo
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- CN111236095A CN111236095A CN202010233933.0A CN202010233933A CN111236095A CN 111236095 A CN111236095 A CN 111236095A CN 202010233933 A CN202010233933 A CN 202010233933A CN 111236095 A CN111236095 A CN 111236095A
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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Abstract
The invention relates to a structure and a method for strengthening the external prestress of a prestressed concrete slab beam of a highway bridge, which comprises a slab structure layer, wherein the slab structure layer is provided with a slab asphalt layer and a pavement layer, the anchoring areas at the two ends of the slab asphalt layer and the pavement layer are respectively provided with a slot, and anchoring components for strengthening the external prestress of the slab structure layer through a tensioning mechanism are arranged in the two slots. The reinforcing method comprises the steps of grooving the asphalt layer and the pavement layer above the anchoring area of the plate body to a structural layer, arranging anchoring at two ends of the plate body, placing a backing plate and an anchor, and forming a 45-degree inclined hole leading to the bottom of the plate on the structural layer below the backing plate; the steering device is arranged at the steering position of the inclined hole at the bottom of the plate; two ends of the steel strand respectively pass through the two inclined holes through the steering gear to be fixedly connected with the anchorage device; and after the steel strand is connected with the anchorage device, tensioning two ends of the steel strand. The reinforcing structure and the method can solve the problem that the conventional external prestress can not be applied to the reinforcement of the prestressed concrete simply supported slab beam.
Description
Technical Field
The invention relates to a structure and a method for externally reinforcing prestress of a prestressed concrete slab girder of a highway bridge.
Background
In recent years, with the great increase of traffic volume and the increasing of driving density and vehicle load in China, a plurality of hidden dangers are brought to the bearing of the bridge, so that the structural damage of the prestressed concrete bridge is more serious. Secondly, the concrete is cracked and collapsed due to the impact and impact of the lower vehicle passing through the upper bridge on the bottom plate, the prestressed steel strands are broken, and the bridge is damaged almost unrepairable due to the condition; the prestressed concrete bridge structure is affected by factors such as stress relaxation, corrosion, slippage, anchorage deformation and the like of the prestressed steel strands in the whole service period, so that the effective prestress of the prestressed steel strands in the structure is reduced, and the problems of rigidity reduction, damage, deflection increase and insufficient bearing capacity of the structure occur. The structure can not meet the use requirement at this moment, and needs to be reinforced in time to recover the use function.
The problems exist in the prestressed concrete slab beam structure, and if a conventional external prestress reinforcing method is adopted, external prestress reinforcing on the prestressed concrete simple-support slab beam cannot be realized. Because the space under the bridge of the prestressed concrete simple supporting plate beam is limited, the using section of the member becomes large after the conventional external prestress reinforcement is used, and the trafficability under the bridge becomes poor.
Disclosure of Invention
The invention aims to provide a structure and a method for reinforcing the external prestress of a prestressed concrete slab beam of a highway bridge, which can solve the problem that the conventional external prestress cannot be applied to the reinforcement of a prestressed concrete simple-supported slab beam.
The technical scheme of the invention is as follows: the utility model provides an external prestressing force reinforced structure of prestressed concrete slab beam of highway bridge, includes the plate structure layer, be provided with plate body pitch layer on the plate structure layer and the layer of mating formation, be provided with the fluting respectively on the anchor district at plate body pitch layer and the layer both ends of mating formation, be located and be provided with the anchor subassembly that realizes the external prestressing force reinforcement of plate structure layer through stretch-draw mechanism in two flutings.
Furthermore, the slot is opened to the plate body structure layer, and the anchoring assembly consists of a backing plate and an anchor.
Further, the backing plate is placed at the bottom of the grooved groove, an included angle inclined towards the outside is formed between the backing plate and the bottom of the groove, and the anchorage device is connected to the upper side of the backing plate.
Furthermore, the included angle between the backing plate and the bottom of the groove inclines outwards by 30-60 degrees, and the anchorage device is a clip type anchorage device.
Further, the tensioning mechanism is including setting up in the backing plate downside and leading to the inclined hole at the bottom of the plate body structural layer board, is connected with the external steel strand wires that pass the inclined hole on the ground tackle of one end, external steel strand wires penetrate the inclined hole of the other end and the fixed stretch-draw of ground tackle that corresponds through the steering gear that sets up on the bottom of the plate body structural layer board.
Further, the inclined hole is a 30-60-degree through hole which is formed in the lower side of the base plate and leads to the bottom of the plate body structural layer, and the inclined hole is formed in the area between the steel strands in the body of the plate body structural layer.
Furthermore, the steering gear is arranged at the steering position of the inclined hole at the bottom of the plate, and the steering positions of the two inclined holes are respectively provided with the steering gear.
Furthermore, the plate bottom section of the external steel strand located on the plate body structure layer is arranged to be attached to the plate bottom, and the external steel strand located on the plate bottom is leveled by mortar after the external steel strand is tensioned.
Furthermore, the external steel strand is tensioned in a manner of tensioning two ends.
A method for reinforcing external prestress of a prestressed concrete slab girder of a highway bridge comprises the following steps:
firstly, grooving an asphalt layer and a pavement layer above an anchoring area to a structural layer of a plate body, and placing a backing plate in the groove;
secondly, a 45-degree inclined hole leading to the bottom of the structural plate body is formed in the groove, and the inclined hole is formed in the area between the steel strands in the structural plate body;
thirdly, placing a backing plate at the bottom of the grooved groove, inclining an included angle between the backing plate and the bottom of the groove by 45 degrees outwards, and installing an anchorage device on the backing plate;
fourthly, respectively installing a steering gear at the outlet of the inclined hole at the bottom of the plate;
fifthly, enabling two ends of the external steel strands to penetrate through the two inclined holes through a steering gear respectively to be fixedly connected with corresponding anchorage devices, and then stretching the two ends, wherein the external steel strands located in the plate bottom section are arranged along the plate bottom;
sixthly, cutting off redundant external steel strands fixed by the anchors at two ends after the external steel strands are tensioned, and completely repairing an asphalt layer and a pavement layer above the anchoring area;
seventhly, completely filling the inclined holes below the base plate by adopting cement paste after the external steel strand is tensioned;
and eighthly, after the external steel strand is tensioned, leveling the external steel strand at the bottom of the plate by adopting mortar.
Compared with the prior art, the invention has the following advantages: the external prestressed reinforcement structure and the external prestressed reinforcement method for the prestressed concrete slab girder of the highway bridge can quickly reinforce the prestressed concrete slab girder under the condition of short-term traffic interruption, can improve the use space of the prestressed concrete slab girder after reinforcement, ensure good trafficability under the bridge, and have the advantages of quick construction, economy, short period and basically no increase of the use section of a component after reinforcement.
Drawings
FIG. 1 is a longitudinal sectional view of the external prestressed reinforcement of a prestressed concrete slab beam according to the present invention;
FIG. 2 is a plan view of a prestressed reinforcement plate body outside the prestressed concrete plate girder according to the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1 according to the present invention;
in the figure: 1-plate body structure layer, 2-plate body asphalt layer and pavement layer, 3-anchorage device, 4-backing plate, 5-external steel strand, 6-steering device, 7-inclined hole, 8-internal steel strand and 9-slotting.
Detailed Description
In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.
Refer to fig. 1 to 3
The utility model provides an external prestressing force reinforced structure of prestressed concrete slab beam of highway bridge, includes plate structure layer 1, be provided with plate body pitch layer on the plate structure layer and mat formation layer 2, for the ease of putting into the anchor subassembly, at the anchor district top fluting at plate structure layer both ends, be provided with fluting 9 on the anchor district at plate body pitch layer and mat formation layer both ends respectively promptly, be located that two flutings are provided with the anchor subassembly that realizes the external prestressing force of plate structure layer through stretch-draw mechanism.
In this embodiment, the fluting is opened to on the plate body structural layer, the anchor subassembly comprises backing plate 4 and ground tackle 3, the backing plate is placed in grooved tank bottom, and the backing plate forms the contained angle of outside slope with the tank bottom, the contained angle inclines 30~60 (preferred 45 °) to the outside, corresponds to the backing plate with the other end to guarantee that the plate body structural layer in anchor district does not destroy because of the pulling force in the ground tackle is too big.
In this embodiment, the anchor is a clip type anchor and is connected to the upper side of the pad plate.
In this embodiment, in order to realize two anchor subassemblies and consolidate the outer prestressing force of plate structure layer, tensioning mechanism is including setting up respectively in the backing plate downside and leading to the inclined hole 7 at the bottom of the plate structure layer board, is connected with the external steel strand wires 5 that pass the inclined hole on the ground tackle of one end, external steel strand wires are fixed and the stretch-draw with the ground tackle that corresponds through the deflector 6 that sets up on the bottom of the plate structure layer board that the inclined hole penetrates the inclined hole of the other end, and the inclined hole 7 is passed to the one end of external steel strand wires 5 promptly, and the other end passes the inclined hole 7 of the plate structure layer other end to respectively through ground tackle 3, then carry.
In this embodiment, in order to reduce the channel friction between the external steel strand 5 and the inclined hole 7, the inclined hole is a 30-60 ° through hole (preferably 45 °) that is disposed at the lower side of the backing plate and leads to the bottom of the structural layer of the plate body, and the inclined hole is opened in the region between the internal steel strands 8 of the structural layer of the plate body.
In this embodiment, the steering device is disposed on the plate bottom and at the turning position of the inclined hole outlet, and the turning positions of the two inclined holes are respectively provided with the steering device so as to be used as a turning and bearing device for the external steel strand.
In this embodiment, the plate bottom section of the external steel strand located in the plate body structure layer is arranged against the plate bottom, so as to reduce the use section of the member after reinforcement, improve the use space of the plate beam after reinforcement, make the under-bridge trafficability characteristic good, and basically ignore the increase of the section of the plate beam after reinforcement.
In this embodiment, in order to make the external steel strand 5 meet the long-term effective corrosion protection requirement, the external steel strand at the bottom of the plate is smoothed by mortar after the external steel strand is tensioned.
In this embodiment, in order to reduce the frictional resistance at the turning position of the external steel strand 5, a two-end tensioning mode is adopted when the external steel strand is tensioned.
The external prestress strengthening method for strengthening the prestressed concrete slab beam of the highway bridge by using the external prestress strengthening structure comprises the following steps:
firstly, grooving 9 above anchoring areas at two ends of a plate body: namely, grooving the asphalt layer and the pavement layer 2 above the anchoring area to the structural layer of the plate body so as to put the backing plate 4 in;
and step two, forming an inclined hole 7: a 45-degree inclined hole leading to the bottom of the structural layer plate body is formed in the groove, and the inclined hole is formed in the area between the steel strands 9 in the body of the structural layer plate body;
thirdly, mounting a backing plate 4 and an anchorage device 3: placing a backing plate 4 at the bottom of the grooved groove, wherein the included angle between the backing plate and the bottom of the groove inclines to the outer side by 45 degrees, and an anchorage device is arranged on the backing plate;
fourthly, installing a steering gear 6: installing a steering gear at the outlet of the inclined hole at the bottom of the plate respectively as a steering and bearing device of the in-vitro steel strand 5;
fifthly, fixing the external steel strand 5: two ends of an external steel strand 5 respectively penetrate through two inclined holes through a steering gear 6 and are fixedly connected with corresponding anchorage devices, namely one end of the external steel strand penetrates through one of the 45-degree inclined holes 7, the other end of the external steel strand penetrates through the other 45-degree inclined hole 7 and respectively passes through the anchorage devices 3, and then two ends of the external steel strand are tensioned, wherein the external steel strand 5 positioned on the plate bottom section is arranged along the plate bottom;
sixthly, repairing the asphalt layer and paving the layer 2: after the external steel strands 5 are tensioned, cutting off redundant external steel strands fixed by the anchorage devices 3 at two ends, and completely repairing the asphalt layer above the anchoring area and the pavement layer 2;
and seventhly, repairing the inclined hole 7: after the external steel strand is tensioned, the inclined hole 7 below the backing plate 4 is completely filled with cement paste, so that the cross section of the plate body is not weakened due to external prestress reinforcement;
eighthly, protecting the external steel strand 5 at the bottom of the plate: and after the external steel strand is tensioned, the external steel strand at the bottom of the plate is smoothed by adopting mortar.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
It will be apparent to those skilled in the art that the above-described embodiments of the present invention are merely preferred embodiments of the present invention, and it is not necessary to create any inventive effort to design various external prestressed reinforcement structures and methods for prestressed concrete slabs of road bridges based on the teachings of the present invention, and all equivalent changes, modifications, substitutions and alterations made without departing from the spirit and scope of the present invention are all within the scope of the present invention.
Claims (10)
1. The utility model provides an external prestressing force reinforced structure of prestressed concrete slab beam of highway bridge, includes the plate structure layer, its characterized in that, be provided with plate body pitch layer on the plate structure layer and the layer of mating formation, be provided with the fluting respectively on the anchor district at plate body pitch layer and the layer both ends of mating formation, be located two flutings and be provided with the anchor subassembly that realizes the external prestressing force reinforcement of plate structure layer through straining device.
2. The external prestressed reinforcement structure of prestressed concrete slab girder of highway bridge according to claim 1, wherein said slot is opened to slab structure layer, and said anchor assembly is composed of a backing plate and an anchor.
3. The external prestressed reinforcement structure of prestressed concrete slab girder of highway bridge according to claim 2, wherein said tie plate is placed at the bottom of grooved slot, the tie plate and the bottom of slot form an angle inclined to the outside, said anchorage device is connected to the upper side of the tie plate.
4. The external prestressed reinforcement structure of the prestressed concrete slab girder of the highway bridge according to claim 3, wherein an included angle between the pad plate and the bottom of the groove is inclined outward by 30-60 degrees, and the anchorage device is a clip type anchorage device.
5. The external prestressed reinforcement structure of prestressed concrete slab beam of highway bridge according to claim 2, 3 or 4, wherein said tension mechanism includes an inclined hole which is set up on the underside of the backing plate and is opened to the bottom of the slab structure layer, the anchorage device of one end is connected with an external steel strand which passes through the inclined hole, said external steel strand is fixed and tensioned with the corresponding anchorage device by penetrating the inclined hole of the other end through the diverter set up on the bottom of the slab structure layer.
6. The external prestressed reinforcement structure of prestressed concrete slab beam of highway bridge according to claim 5, wherein said inclined hole is a 30-60 ° through hole provided at the lower side of said tie plate and leading to the bottom of slab structure layer, and said inclined hole is opened in the region between the steel strands in the slab structure layer.
7. The external prestressed reinforcement structure of prestressed concrete slab beam of highway bridge according to claim 5, wherein said deflector is installed at the turning position of inclined hole at slab bottom, and the turning positions of two inclined holes are respectively installed with deflector.
8. The external prestressed reinforcement structure for prestressed concrete slab girders of road bridges according to claim 5, wherein the external steel strands at the slab bottom section of the slab structure layer are arranged against the slab bottom, and the external steel strands at the slab bottom are leveled by mortar after the external steel strands are tensioned.
9. The external prestressed reinforcement structure of prestressed concrete slab girder of highway bridge according to claim 5, wherein said external steel strand is tensioned by means of two-end tensioning.
10. A method for reinforcing external prestress of a prestressed concrete slab girder of a highway bridge, which comprises the external prestress reinforcing structure of the prestressed concrete slab girder of the highway bridge as claimed in claim 5, and is characterized by comprising the following steps:
firstly, grooving an asphalt layer and a pavement layer above an anchoring area to a structural layer of a plate body, and placing a backing plate in the groove;
secondly, a 45-degree inclined hole leading to the bottom of the structural plate body is formed in the groove, and the inclined hole is formed in the area between the steel strands in the structural plate body;
thirdly, placing a backing plate at the bottom of the grooved groove, inclining an included angle between the backing plate and the bottom of the groove by 45 degrees outwards, and installing an anchorage device on the backing plate;
fourthly, respectively installing a steering gear at the outlet of the inclined hole at the bottom of the plate;
fifthly, enabling two ends of the external steel strands to penetrate through the two inclined holes through a steering gear respectively to be fixedly connected with corresponding anchorage devices, and then stretching the two ends, wherein the external steel strands located in the plate bottom section are arranged along the plate bottom;
sixthly, cutting off redundant external steel strands fixed by the anchors at two ends after the external steel strands are tensioned, and completely repairing an asphalt layer and a pavement layer above the anchoring area;
seventhly, completely filling the inclined holes below the base plate by adopting cement paste after the external steel strand is tensioned;
and eighthly, after the external steel strand is tensioned, leveling the external steel strand at the bottom of the plate by adopting mortar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010233933.0A CN111236095A (en) | 2020-03-30 | 2020-03-30 | External prestress reinforcing structure and method for prestressed concrete slab girder of highway bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010233933.0A CN111236095A (en) | 2020-03-30 | 2020-03-30 | External prestress reinforcing structure and method for prestressed concrete slab girder of highway bridge |
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| Publication Number | Publication Date |
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| CN111236095A true CN111236095A (en) | 2020-06-05 |
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| CN202010233933.0A Pending CN111236095A (en) | 2020-03-30 | 2020-03-30 | External prestress reinforcing structure and method for prestressed concrete slab girder of highway bridge |
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| CN (1) | CN111236095A (en) |
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- 2020-03-30 CN CN202010233933.0A patent/CN111236095A/en active Pending
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