CN102518042A - Method of constructing transverse connection prestressed tendons of T-shaped simply-supported concrete composite bridge - Google Patents
Method of constructing transverse connection prestressed tendons of T-shaped simply-supported concrete composite bridge Download PDFInfo
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- CN102518042A CN102518042A CN2011104266674A CN201110426667A CN102518042A CN 102518042 A CN102518042 A CN 102518042A CN 2011104266674 A CN2011104266674 A CN 2011104266674A CN 201110426667 A CN201110426667 A CN 201110426667A CN 102518042 A CN102518042 A CN 102518042A
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Abstract
A method of constructing transverse connection prestressed tendons of a T-shaped simply-supported concrete composite bridge solves the technical problems that the prestressed tendons in the prior art are constructed by cementing prior to tensioning so that concrete is infirmly combined with the prestressed tendons. According to the technical scheme, the construction method includes steps: reserving a group of axially corresponding mounting holes on two adjacent piers, mounting prestressed anchor components in the mounting holes, and fastening the prestressed tendons, wherein the prestressed tendons are fastened between the adjacent piers in the step of fastening the prestressed tendons by tensioning prior to cementing. By the construction method of tensioning prior to grouting, the concrete is tightly combined with the prestressed tendons into an integrated structure, and the concrete directly wraps the prestressed tendons to be tightly combined with the prestressed tendons, so that bearing capacity of the prestressed tendons is enhanced, and the ruptured tendons are also prevented from damaging concrete anchor recesses to fly out to injure passengers or hit a train on an opposite track so as to cause heavy casualties.
Description
Technical field
The invention belongs to the bridge construction construction field; Relate to the job practices that a kind of T type concrete freely-supported bridge lateral connects prestressed reinforcement; Concrete relate to a kind of mode that bonds behind the pretensioning that adopts, laterally connect the job practices of prestressed reinforcement at T type concrete freely-supported combined bridge.
Background technology
In numerous highway bridges of China, especially in the high ferro bridge, great majority use T type concrete freely-supported bridge as the beam support structure at present.Single T type concrete simple bridge joist support receives extraneous prestressed weak effect; Therefore all adopt many T type concrete combined bridge at present; And need combine by prestressed reinforcement between the bridge pier of combined bridge; How to make the structure between the combination freely-supported bridge that adds prestressed reinforcement more firm, and make the ability to bear of prestressed reinforcement stronger, be the problems of those skilled in the art in persistent discussion always.
The number of patent application that our company declared in last year is in the patent of [201010106889.3]; The job practices that a kind of T type concrete freely-supported combined bridge laterally connects is also disclosed; After carrying out the continuation construction, find that this method connects prestressed reinforcement and has certain potential safety hazard.Prestressed reinforcement is wrapped with the high-density polyethylene resin sheath; Though having played, this sheath protect reinforcing bar to avoid the effect that is corroded; Combine with concrete but confined presstressed reinforcing steel, make the possibility of prestressed reinforcement axially-movable increase greatly just because of the existence of this sheath.Give the stretching force of prestress system own big characteristics, in case the moment fracture takes place presstressed reinforcing steel, thereby it will damage the concrete anchor recess and flies out so, bullet wound passerby or get on the train of opposite track and cause great damage.Simultaneously, because the job practices that has adopted first bonded post tensioning to draw in this job practices inevitably can be destroyed combining between concrete and protective sleeve or the reinforcing bar.Therefore be necessary that the job practices that T type concrete freely-supported combined bridge in the prior art is laterally connected prestressed reinforcement improves; A kind of better job practices is proposed; The intensity of prestressed reinforcement is better brought into play, solved the risk of prestressed reinforcement moment fracture simultaneously.
Summary of the invention
The present invention causes concrete to combine unstable technical problem with prestressed reinforcement for solving the job practices that prestressed reinforcement adopts first bonded post tensioning to draw in the prior art; Designed the job practices that a kind of T type concrete freely-supported combined bridge laterally connects prestressed reinforcement; Through adopting the job practices of pretensioning grouting behind shaft or drift lining, concrete and prestressed reinforcement are combined closely be integrally formed the formula structure.
The present invention for realizing the technical scheme that the foregoing invention purpose adopts is; T type concrete freely-supported combined bridge laterally connects the job practices of prestressed reinforcement; Comprise in the step of this job practices: adjacent bridge pier offers the corresponding installing hole in one group of axle center, prestressed anchoring assembly, fixing prestressed reinforcement in installing hole; Adopt the process that bonds behind the pretensioning that prestressed reinforcement is fixed between the adjacent bridge pier in the construction sequence of above-mentioned fixedly prestressed reinforcement, the concrete steps of above job practices comprise:
A, on the adjacent bridge pier of T type concrete freely-supported combined bridge, offer the corresponding installing hole in one group of axle center, and between adjacent bridge pier, be provided with and supporting cast-in-place sleeve pipe, the formation slip casting passage of installing hole;
B, the spiral bar in the prestress anchoraging assembly is cast in the installing hole of bridge pier, an end exposes;
C, the anchor slab in the prestress anchoraging assembly is positioned on the bridge pier lateral wall and with through hole on the anchor slab and installing hole coaxial line aligns, anchor slab and spiral bar exposed welding location, termination;
Penetrate prestressed reinforcement in the slip casting passage that D, the installing hole on bridge pier and cast-in-place sleeve pipe form;
Pad and the nut in the prestress anchoraging assembly is inserted at the two ends of E, prestressed reinforcement respectively, according to designing requirement prestressed reinforcement applied prestressing force and clamp nut;
After F, prestressed reinforcement apply prestressing force and reach designing requirement, in the slip casting passage that installing hole and cast-in-place sleeve pipe form, implement slip casing by pressure, concrete and prestressed reinforcement are bonded to one, accomplish and construct by the Grouting Pipe that is provided with on the anchor slab.
The present invention is through adopting the job practices of pretensioning grouting behind shaft or drift lining; Concrete and prestressed reinforcement are combined closely be integrally formed the formula structure, concrete directly is wrapped in outside the prestressed reinforcement, combines closely with prestressed reinforcement; Strengthened the bearing strength of presstressed reinforcing steel greatly; Also avoid simultaneously when reinforcing bar moment fracture, flying out bullet wound passerby or get on the train of opposite track and cause great damage thereby damage the concrete anchor recess.
Below in conjunction with accompanying drawing the utility model is elaborated.
Description of drawings
Fig. 1 is the structural representation of prestress anchoraging assembly among the present invention.
In the accompanying drawing, 1 represents prestressed reinforcement, and 2 represent anchor slab, and 3 represent spiral bar, and 4 represent pad, and 5 represent nut, and 6 represent Grouting Pipe.
The specific embodiment
T type concrete freely-supported combined bridge laterally connects the job practices of prestressed reinforcement; Comprise in the step of this job practices: adjacent bridge pier offers the corresponding installing hole in one group of axle center, prestressed anchoring assembly, fixing prestressed reinforcement 1 in installing hole; Adopt the process that bonds behind the pretensioning that prestressed reinforcement 1 is fixed between the adjacent bridge pier in the construction sequence of above-mentioned fixedly prestressed reinforcement 1, the concrete steps of above job practices comprise:
A, on the adjacent bridge pier of T type concrete freely-supported combined bridge, offer the corresponding installing hole in one group of axle center, and between adjacent bridge pier, be provided with and supporting cast-in-place sleeve pipe, the formation slip casting passage of installing hole;
B, the spiral bar in the prestress anchoraging assembly 3 is cast in the installing hole of bridge pier, an end exposes;
C, the anchor slab in the prestress anchoraging assembly 2 is positioned on the bridge pier lateral wall and with through hole on the anchor slab 2 and installing hole coaxial line aligns, anchor slab 2 and spiral bar 3 exposed welding location, termination;
Penetrate prestressed reinforcement 1 in the slip casting passage that D, the installing hole on bridge pier and cast-in-place sleeve pipe form;
Pad 4 and the nut 5 in the prestress anchoraging assembly is inserted at the two ends of E, prestressed reinforcement 1 respectively, according to designing requirement prestressed reinforcement 1 applied prestressing force and clamp nut 5;
After F, prestressed reinforcement 1 apply prestressing force and reach designing requirement, in the slip casting passage that installing hole and cast-in-place sleeve pipe form, implement slip casing by pressure, concrete and prestressed reinforcement are bonded to one, accomplish and construct by the Grouting Pipe 6 that is provided with on the anchor slab 2.
Above-mentioned steps A, B, C combine enforcement: during the construction and installation hole, at position of mounting hole, will be cast in the bridge pier of T type concrete freely-supported combined bridge with spiral bar 3 anchor slabs 2 welded together simultaneously.
It is one group that prestressed reinforcement 1 in the above-mentioned T type that the is applied in concrete freely-supported bridge adopts two of span centres; Three at beam body two ends are one group; Use the anchor slab 2 of disjunctor, the two ends of every prestressed reinforcement 1 are inserted in pad 4 and nut 5 respectively, and every prestressed reinforcement 1 all is inserted in cast-in-place sleeve pipe.
In the above-mentioned step e span centre pre-stress rib stretching force is controlled at 19 ~ 21 tons, the connection of beam body two ends is controlled at 21 ~ 22 tons with pre-stress rib stretching force.
The material of the prestressed reinforcement 1 that uses in the above-mentioned job practices is low-carbon alloy steel, preferred three or five silicon, two chromium, and diameter is 15.5-17.5mm, preferred 16 ~ 17mm, more preferably 16mm.
What the spiral bar 3 in the above-mentioned job practices adopted is the low-carbon (LC) cold drawn wire that meets the YB/T5294 regulation, and the peripheral diameter of spiral circle is 75-85mm.
In the above-mentioned step F, accomplish slip casing by pressure after, anchor slab 2, pad 4, nut 5 water muddings is dead, anchor face and the equating of T type concrete simple bridge beam sides.
In the above-mentioned step e span centre pre-stress rib stretching force preferably is controlled at 20 tons, the connection of beam body two ends preferably is controlled at 21.4 tons with pre-stress rib stretching force.
In the above-mentioned step e, the specification of pad 4 is: φ 70 * 16mm, and wherein φ 70 represents the cylindrical of pad, and 16 represent the thickness of pad.
In the above-mentioned step e, the specification of nut 5 is: on behalf of the nominal diameter, 1.5 of nut thread, M17 * 1.5 (40 * 25) mm, wherein 17 represent the pitch, 40 of nut thread to represent the opposite side distance, 25 of nut to represent the thickness of nut; Median septum is used anchor slab: 200 * 110 * 16mm, endplate is used anchor slab: 338 * 110 * 16mm.
The utility model in the specific implementation; When adopting cast-in-place sleeve pipe connection hole, the slip casting passage is blocked, is formed in the slit between cast-in-place sleeve pipe and the installing hole, so as not to when slip casting spillage; Cause the unreal situation of slip casting passage slurry to produce, thereby influence rod iron and concrete bonding.
After treating that the beam body fixes, an end of prestressed steel bar is penetrated the slip casting passage from a side of beam body, then pad 4 is penetrated the two ends of rod iron and screw in the anchoring nut of M17*1.5, and secure it to the position, the fixed end screw thread exposes 15-20mm.
Tensioning head and tension rod are linked together through screw thread in advance, and it is screwed in steel bar tensing end expose the screw thread place, be threaded to apart from anchoring nut 1mm place and get final product; Jack is penetrated on the tension rod, and, be screwed onto and the jack joint place the setscrew nut of jack rear end; Manually suppress to fixed pressure, shake the set lever on the jack then, put in place the anchoring nut is fastening; Manually release; The setscrew nut of removal jack rear end unloads jack and tension rod; Affix one's seal, accomplish to show stretch-draw; Sealing off and covering anchorage.
Claims (10)
1.T the job practices of setting up horizontal connection prestressed reinforcement in the type concrete freely-supported combined bridge; Comprise in the step of this job practices: adjacent bridge pier offers the corresponding installing hole in one group of axle center, prestressed anchoring assembly, fixing prestressed reinforcement (1) in installing hole; It is characterized in that: adopt the process that bonds behind the pretensioning that prestressed reinforcement (1) is fixed between the adjacent bridge pier in the construction sequence of described fixedly prestressed reinforcement (1), the concrete steps of above job practices comprise:
A, on the adjacent bridge pier of T type concrete freely-supported combined bridge, offer the corresponding installing hole in one group of axle center, and between adjacent bridge pier, be provided with and supporting cast-in-place sleeve pipe, the formation slip casting passage of installing hole;
B, the spiral bar in the prestress anchoraging assembly (3) is cast in the installing hole of bridge pier, an end exposes;
C, the anchor slab in the prestress anchoraging assembly (2) is positioned on the bridge pier lateral wall and with through hole on the anchor slab (2) and installing hole coaxial line aligns, anchor slab (2) and spiral bar (3) exposed welding location, termination;
Penetrate prestressed reinforcement (1) in the slip casting passage that D, the installing hole on bridge pier and cast-in-place sleeve pipe form;
Pad (4) and the nut (5) in the prestress anchoraging assembly is inserted at the two ends of E, prestressed reinforcement (1) respectively, according to designing requirement prestressed reinforcement (1) applied prestressing force and clamp nut (5);
After F, prestressed reinforcement (1) apply prestressing force and reach designing requirement; Go up the Grouting Pipe (6) that is provided with by anchor slab (2) and in the slip casting passage of installing hole and the formation of cast-in-place sleeve pipe, implement slip casing by pressure, concrete and prestressed reinforcement are bonded to one, accomplish construction.
2. the job practices of setting up horizontal connection prestressed reinforcement in the T type concrete freely-supported combined bridge according to claim 1; It is characterized in that: described steps A, B, C combine enforcement: during the construction and installation hole; At position of mounting hole, will be cast in the bridge pier of T type concrete freely-supported combined bridge with spiral bar (3) anchor slab (2) welded together simultaneously.
3. the job practices of setting up horizontal connection prestressed reinforcement in the T type concrete freely-supported combined bridge according to claim 1 and 2; It is characterized in that: it is one group that the prestressed reinforcement (1) in the described T of the being applied in type concrete freely-supported bridge adopts two of span centres; Three at beam body two ends are one group; Use the anchor slab (2) of disjunctor, the two ends of every prestressed reinforcement (1) are inserted in pad (4) and nut (5) respectively, and every prestressed reinforcement (1) all is inserted in cast-in-place sleeve pipe.
4. the job practices of setting up horizontal connection prestressed reinforcement in the T type concrete freely-supported combined bridge according to claim 3; It is characterized in that: in the described step e span centre pre-stress rib stretching force is controlled at 19 ~ 21 tons, the connection of beam body two ends is controlled at 21 ~ 22 tons with pre-stress rib stretching force.
5. the job practices of setting up horizontal connection prestressed reinforcement in the T type concrete freely-supported combined bridge according to claim 1; It is characterized in that: the material of the prestressed reinforcement of using in the said job practices (1) is a low-carbon alloy steel, and diameter is 15.5-17.5mm.
6. the job practices of setting up horizontal connection prestressed reinforcement in the T type concrete freely-supported combined bridge according to claim 1; It is characterized in that: what the spiral bar in the said job practices (3) adopted is the low-carbon (LC) cold drawn wire that meets the YB/T5294 regulation, and the peripheral diameter of spiral circle is 75-85mm.
7. the job practices of setting up horizontal connection prestressed reinforcement in the T type concrete freely-supported combined bridge according to claim 1; It is characterized in that: in the described step F; After accomplishing slip casing by pressure; Anchor slab (2), pad (4), nut (5) water mudding is dead, anchor face and the equating of T type concrete simple bridge beam sides.
8. T type concrete freely-supported combined bridge according to claim 4 laterally connects the job practices of prestressed reinforcement; It is characterized in that: in the described step e span centre pre-stress rib stretching force preferably is controlled at 20 tons, the connection of beam body two ends preferably is controlled at 21.4 tons with pre-stress rib stretching force.
9. T type concrete freely-supported combined bridge according to claim 5 laterally connects the job practices of prestressed reinforcement, it is characterized in that: preferred three or five silicon of the material of described prestressed reinforcement (1) two chromium, diameter is 15.5-17.5mm.
10. T type concrete freely-supported combined bridge according to claim 5 laterally connects the job practices of prestressed reinforcement, it is characterized in that: the preferred 16mm of diameter of described prestressed reinforcement (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011104266674A CN102518042A (en) | 2011-12-19 | 2011-12-19 | Method of constructing transverse connection prestressed tendons of T-shaped simply-supported concrete composite bridge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104266674A CN102518042A (en) | 2011-12-19 | 2011-12-19 | Method of constructing transverse connection prestressed tendons of T-shaped simply-supported concrete composite bridge |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103911952A (en) * | 2014-03-28 | 2014-07-09 | 中交第一航务工程局有限公司 | Positioning construction method of prestressed steel corrugated pipe |
| CN104762878A (en) * | 2015-04-16 | 2015-07-08 | 福州大学 | Construction method of simply supported girder bridge continuous slab-deck structure with prestress and structure of construction method |
| CN106192760A (en) * | 2016-07-22 | 2016-12-07 | 成都鹏程路桥机械有限公司 | A kind of installation method of prestressed anchor assembly |
| WO2021004417A1 (en) * | 2019-07-08 | 2021-01-14 | 中建三局第二建设工程有限责任公司 | Anchoring assembly for transversely bonded prestressed steel rod for bridge tower and construction method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103911952A (en) * | 2014-03-28 | 2014-07-09 | 中交第一航务工程局有限公司 | Positioning construction method of prestressed steel corrugated pipe |
| CN103911952B (en) * | 2014-03-28 | 2016-01-20 | 中交第一航务工程局有限公司 | Prestressed reinforcement bellows positioning construction method |
| CN104762878A (en) * | 2015-04-16 | 2015-07-08 | 福州大学 | Construction method of simply supported girder bridge continuous slab-deck structure with prestress and structure of construction method |
| CN106192760A (en) * | 2016-07-22 | 2016-12-07 | 成都鹏程路桥机械有限公司 | A kind of installation method of prestressed anchor assembly |
| WO2021004417A1 (en) * | 2019-07-08 | 2021-01-14 | 中建三局第二建设工程有限责任公司 | Anchoring assembly for transversely bonded prestressed steel rod for bridge tower and construction method |
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Application publication date: 20120627 |