CN201801806U - Externally-prestressed continuous beam bridge with first simple supporting and second continuation - Google Patents
Externally-prestressed continuous beam bridge with first simple supporting and second continuation Download PDFInfo
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- CN201801806U CN201801806U CN2010205509956U CN201020550995U CN201801806U CN 201801806 U CN201801806 U CN 201801806U CN 2010205509956 U CN2010205509956 U CN 2010205509956U CN 201020550995 U CN201020550995 U CN 201020550995U CN 201801806 U CN201801806 U CN 201801806U
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Abstract
The utility model discloses an externally-prestressed continuous beam bridge with first simple supporting and second continuation, which comprises a concrete beam, wherein an externally-prestressed beam with first simple supporting and second continuation is used as the concrete beam; externally-prestressed tendons playing a bearing role are symmetrically arranged at two sides of the concrete beam; the concrete beam consists of a wing plate, a web plate, a horseshoe and diaphragm plates; the wing plate, the web plate and the horseshoe are integrated and the cross sections of the integrated body are T-shaped; the concrete beam is provided with a plurality of diaphragm plates on which externally-prestressed pore ducts are arranged; and a plurality of span steering blocks are arranged in the span at two sides of the concrete beam. By adopting the construction technology, the externally-prestressed continuous beam bridge with first simple supporting and second continuation has the characteristics of being convenient for the replacement of the prestressed tendons, less in the friction loss, light in the hoisting weight of the beam body, easy in the assembled construction and thin in the bridge deck paving surface.
Description
Technical field
The utility model relates to a kind of beam bridge construction technology, continuous external prestressing continuous girder bridge behind particularly a kind of first freely-supported.
Background technology
Along with the fast development of China Higher level highway, to connecting the corresponding lifting of bridge quality requirement of speedway, bridge Construction Technology is very crucial.Present present situation is: for the high-grade highway bridge of the striding the footpath for a short time forms that adopt assembled steel reinforced concrete plate beam more, medium bridge of striding the footpath then adopts the form of prefabricated PC concrete T (case) beam, for striding footpath prestressed concrete continuous beam bridge greatly, present job practices mainly adopts balanced cantilever casting method or assembly unit method.But because the construction complexity of cast-in-situ continuous beam is loaded down with trivial details, time-consuming, people wish the superior function of prefabricated production of the batch of simply supported beam and continuous beam is combined always, realize with beam or plate in batches the mode of prefabricated production accelerate continuous beam construction this be that we often say " constructing continuously behind the first freely-supported " method.Continuous bridge construction has following characteristics behind elder generation's freely-supported: (1) rigidity is big, distortion is little, the shrinkage joint is few and it is comfortable to drive a vehicle; (2) prestressed strand of simply supported beam carries out stretch-draw in factory, and the prestressed strand of hogging moment area is arranged and stretch-draw is all carried out on concrete beam, only need hanging device lifting concrete beam, reduced construction equipment, can avoid the ground obstacle of stretch-draw prestressing force steel Shu Zaocheng again; (3) precast beam can adopt standardized structural element, carries out unified production of batch production and management, helps technical operation, has saved the engineering time, the reduction of erection time, increases economic efficiency.
There is the problem of two broad aspect in investigation and analysis existing highway bridge: on the one hand, existing 20 years～30 years of quite a few bridge viability, phenomenons such as the beam body has occurred the concrete breakage, peels off, corrosion of steel bar, crack, load carrying capacity of bridge is affected; On the other hand, because the traffic volume increases, vehicle load strengthens, and the part bridge capacity is obviously not enough, is badly in need of reinforcing, and this is paid close attention to by the world.Along with the protection question of suspension cable since the sixties is constantly solved and perfect, also made the anticorrosion problem that belongs to the external prestressing of same category with suspension cable obtain good solution; And because the prestressing with bond structure is often arranged a large amount of reinforcing bars in web, and bend is also many, crowded bend also can't guarantee grouting quality, cause the corrosion of steel bundle, influence durability of structures, it is better than the structure durability of joining bundle in the body that international conventional wisdom has been tended to external prestressing steel bundle over nearly 20 years.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of prestressing tendon change convenient, friction loss is little, beam body hoisting weight is light, be easy to prefabricated construction, continuous external prestressing continuous girder bridge behind the first freely-supported of bridge deck pavement thin thickness.
The purpose of this utility model is achieved by following technical proposals:
Continuous external prestressing continuous girder bridge behind a kind of first freely-supported comprises concrete beam, and described concrete beam adopts continuous external prestressing beam behind the first freely-supported, and the bilateral symmetry of described concrete beam has been equipped with the external pre-stress bundle of carrying effect.
In the utility model, described concrete beam comprises wing plate, web, water chestnut and diaphragm, described wing plate, web and water chestnut are that integral body and cross section are T shape, described concrete beam is provided with the described diaphragm of polylith, described diaphragm is provided with the external prestressing duct, between whenever striding, the both sides of described concrete beam are provided with a plurality of steering block of striding, whenever the position, intermediate pier top of striding of described concrete beam is provided with pier top steering block, described external pre-stress bundle is installed in the external prestressing duct of diaphragm, stride in the transfer of the transfer of a steering block and pier top steering block, the two ends of described external pre-stress bundle are anchored on the anchor block.
In the utility model, a described steering block of striding is symmetricly set on diaphragm position in concrete beam second road, described external pre-stress bundle is upwards bent up from this position, and described pier top steering block is arranged on concrete beam beam-ends position, and described external pre-stress bundle is bent up downwards from this position.
In the utility model, described stride a steering block and pier top steering block by the standard diaphragm strengthen, the thickening sectional dimension constitutes.
In the utility model, described concrete beam cuts section bar for the T type.
Owing to adopt such scheme, external prestressing structure is arranged in presstressed reinforcing steel outside the agent structure of beam, by the two ends anchor block, stride a steering block, pier top steering block links to each other with the beam body, basic design philosophy is, in the construction stage, minimally utilizes prestressing with bond Shu Shixian overall structure stressed in the construction stage, utilizes the external pre-stress bundle of second phase to bear the second stage of dead load and service load again.
Owing to adopt such scheme, have following remarkable advantage:
(1) external pre-stress bundle is arranged in outside the web, is convenient to safeguard and change, and has alleviated the deadweight of beam body simultaneously, has increased the span ability of bridge, has avoided the shortcoming that bellows is closeer, web is difficult for jolt ramming, and beam body weight reduction is convenient to transportation and installation.
(2) external pre-stress bundle adopts elongated layout, has saved Dun Ding position hogging moment bundle and ground tackle, attenuate bridge floor need the layer thickness of mating formation be provided with because of anchoring.
(3) external pre-stress bundle changes direction by striding a steering block and pier top steering block, and only stride a steering block, pier top steering block contacts with concrete with anchoring place, thereby the prestressing force friction loss reduces, raising prestressing force benefit.
Description of drawings
Fig. 1 sets up for concrete T-shaped beam of the present utility model and external pre-stress bundle, stride the structural representation that a steering block, pier top steering block, anchor block are arranged.
Fig. 2 is the enlarged drawing at Fig. 1 A place.
Fig. 3 is the utility model concrete T-shaped beam structural representation.
Fig. 4 is the sectional view of the utility model external pre-stress bundle.
Fig. 5 is the sectional view of the utility model concrete T-shaped beam.
Among the accompanying drawing 1-5: 1---anchor block, 2---stride a steering block, 3---external pre-stress bundle, 4---pier top steering block, 5---damper, 6---transfer, the pre-pipe laying of 7---, 8---ground tackle, 9---epoxy and are coated with steel strand, 10---pre-embedded steel slab, 11---PE sleeve pipe, 12---grease, hole, 13---external prestressing road, 14---water chestnut, 15---wing plate, 16---diaphragm, 17---web.
The specific embodiment
Below in conjunction with accompanying drawing, describe the specific embodiment of external prestressing continuous girder bridge continuous behind the first freely-supported in detail.
Shown in Fig. 1,2,3,4,5, continuous external prestressing continuous girder bridge behind a kind of first freely-supported, comprise concrete beam, described concrete beam adopts continuous external prestressing beam behind the first freely-supported, and the bilateral symmetry of described concrete beam has been equipped with the external pre-stress bundle 3 of carrying effect.
In the utility model, described concrete beam comprises wing plate 15, web 17, water chestnut 14 and diaphragm 16, and described wing plate 15, web 17 and water chestnut 14 are that integral body and cross section are T shape, on the described web 17
Concrete is provided withThe described diaphragm 16 of polylith is arranged, described diaphragm 16 is provided with external prestressing duct 13, web both sides between described concrete beam is whenever striden are provided with a plurality of steering block 2 of striding, the position, every intermediate pier top of described concrete beam is provided with pier top steering block 4, described external pre-stress bundle 3 is installed in the transfer of the external prestressing duct 13 of diaphragm 16, the transfer 6 of striding a steering block 2 and pier top steering block 4, and the two ends of described external pre-stress bundle 3 are anchored on the anchor block 1.
In the utility model, the described steering block 2 of striding is symmetricly set on diaphragm position in concrete beam second road, described external pre-stress bundle 3 is upwards bent up from this position, and described pier top steering block 4 is arranged on concrete beam beam-ends position, and described external pre-stress bundle is bent up downwards from this position.
In the utility model, described stride a steering block 2 and pier top steering block 4 by the standard diaphragm strengthen, the thickening sectional dimension constitutes.
In the utility model, described concrete beam cuts section bar for the T type.
In the utility model, described external pre-stress bundle 3 comprises epoxy spraying steel strand 9, PE sleeve pipe 11, grease 12, and described PE sleeve pipe 11 is sleeved on outside the described epoxy spraying steel strand 9, is filled with grease 12 between described PE sleeve pipe 11 and the described epoxy spraying steel strand 9.
In the utility model, be provided with vibration absorber 5 every 8-10m on the described external pre-stress bundle 3, described damping device 5 is fixed on the concrete beam by pre-embedded steel slab 10.
Job practices of the present utility model: after pouring concrete T-shaped beam, treat that concrete strength reaches 95% of design strength, stretch-draw prestressing with bond bundle, prestressing with bond Shu Caiyong low relaxed prestress steel strand; The permanent bearing of each bridge pier is installed then, by setting up concrete T-shaped beam in the hole, is provided with between concrete T-shaped beam is whenever striden and strides a steering block 2, in position, concrete T-shaped beam every intermediate pier top pier top steering block 4 is set, beam-ends is provided with wet joint 60cm; After having set up concrete T-shaped beam, external pre-stress bundle 3 passes the pre-pipe laying 7 of anchor block 1, the hole, external prestressing road 13 of diaphragm 16, the transfer 6 of striding a steering block 2, pier top steering block 4 and is connected to another and strides concrete T-shaped beam, form the external pre-stress bundle of elongated layout continuously, the two ends of external pre-stress bundle 3 are fixed on the anchor block 1 by ground tackle 8; Cast Dun Ding place beam-ends wet joint makes concrete T-shaped beam in that vertically the formation structure is continuous, laterally laterally is being linked to be integral body by the cast-in-place wet seam between wing plate and the diaphragm, the external pre-stress bundle of stretch-draw for the first time; Bridge deck construction back (the bridge deck construction comprises: build crashproof railing or installation wave mode guardrail, build bridge surface cement concrete and bituminous concrete, drainage etc. is installed), the external pre-stress bundle of stretch-draw for the second time.
Embodiment: as shown in Figure 1, be three to stride concrete T-shaped beam, adopt the continuous external prestressing continuous T beam bridge of first freely-supported prefabricated back structure, spanning arranges that the left width of cloth is (40m+41m+35m), the right width of cloth is the (beam bridge of 24m+41m+35m), class of loading is an automobile-surpass 20 grades, trailer-120, and concrete T-shaped beam adopts the C50 concrete.As shown in Figure 5, for keeping coordinating mutually with front and back binding beam height, reduce the deck-molding type, the concrete T-shaped beam deck-molding adopts 2.3 m, concrete T-shaped beam adopts T section, described concrete T-shaped beam comprises wing plate 15, web 17, water chestnut 14, diaphragm 16 and is arranged in external pre-stress bundle 3, transfer 6 and anchoring system outside the web 17, external pre-stress bundle 3 is arranged in outside the web 17, make near the beam rib width of span centre be reduced to 18cm by original 22cm, the width of water chestnut 14 is reduced to 42 cm by original 54cm; Adopt external pre-stress bundle 3 elongated layouts, save Dun Ding position hogging moment bundle and ground tackle, the layer thickness of mating formation that the attenuate bridge floor need be provided with because of anchoring, the thickness of bridge deck pavement is reduced to 10 cm by 15 cm.Be associated in fulcrum place and span centre full diaphragm is set respectively, deck transverse slope is formed by common combinations such as the concrete T-shaped beam wing plate are prefabricated along the slope, bent cap is tilting.
Prestress system: this bridge adopts the mode of prestressing with bond and external prestressing hybrid reinforcement.
Prestressing with bond bundle 3 adopts nominal diameter
Low relaxed prestress steel strand, its tension normal intensity
, modulus of elasticity
, control stress for prestressing
, ground tackle 8 adopts HVM group's anchor system.
Shown in Fig. 1,4, external pre-stress bundle 3 adopts nominal diameter
There are not bonding underrelaxation epoxy spraying steel strand 9, its tension normal intensity
, modulus of elasticity
Full-bridge adopts 2-6
External pre-stress bundle 3 is along the elongated layout in concrete T-shaped beam web 17 both sides.External pre-stress bundle 3 outer suit high density polyethylene (HDPE) PE sleeve pipes 11, stretch-draw external pre-stress bundle 3 backs pour into grease 12 in PE sleeve pipe 11, use OVM ground tackle 8, every 8 ~ 10m vibration absorber 5 is set one along PE sleeve pipe 11, damping device 5 is fixed on the concrete T-shaped beam by pre-embedded steel slab 10.
Turn to and anchoring system:
Steering block is the curved shape of external pre-stress bundle maintenance design in striding the footpath and the vitals that transmits Suo Li securely.Between this is associated in and whenever strides, position, intermediate pier top is provided with respectively and strides a steering block and pier top steering block.According to size of bend radius, angle of bend and the stretching force of external pre-stress bundle etc., a described steering block of striding is symmetricly set on diaphragm position in concrete T-shaped beam second road, the thickness of striding a steering block is made as 60 cm, pier top steering block is arranged on concrete T-shaped beam beam-ends position, the thickness of pier top steering block is 75 cm, and structure is arranged and seen Fig. 1.Adopt ANSYS software to striding a steering block and pier top steering block local pressure carries out spatial analysis, the tensile stress and the shearing stress distribution that produce when obtaining external pre-stress bundle and turning to, the ring muscle surround single steering force muscle is set in striding a steering block and pier top steering block in view of the above and surrounds the stirrup of remaining silent of the strong muscle of institute in the piece, and will encircle the interior longitudinal reinforcement of muscle and stirrup and beam and bind round knot mutually along striding a steering block and pier top steering block periphery.
The utility model is not limited to above-mentioned embodiment; extend to continuous external prestressing continuous girder bridge behind the first freely-supported of multispan by above-mentioned embodiment; every with the utlity model has identical or close technical scheme, all fall within the protection domain of the present utility model.
Claims (7)
1. continuous external prestressing continuous girder bridge behind the first freely-supported, comprise concrete beam, it is characterized in that: described concrete beam adopts continuous external prestressing beam behind the first freely-supported, and the bilateral symmetry of described concrete beam has been equipped with the external pre-stress bundle (3) of carrying effect.
2. continuous external prestressing continuous girder bridge behind the first freely-supported according to claim 1, it is characterized in that: described concrete beam comprises wing plate (15), web (17), water chestnut (14) and diaphragm (16), described wing plate (15), web (17) and water chestnut (14) are that integral body and cross section are T shape, described concrete beam is provided with the described diaphragm of polylith (16), described diaphragm (16) is provided with external prestressing duct (13), between whenever striding, the both sides of described concrete beam are provided with a plurality of steering block (2) of striding, whenever the position, intermediate pier top of striding of described concrete beam is provided with pier top steering block (4), described external pre-stress bundle (3) is installed in the external prestressing duct (13) of diaphragm (16), stride in the transfer of the transfer (6) of a steering block (2) and pier top steering block (4), the two ends of described external pre-stress bundle (3) are anchored on the anchor block (1).
3. continuous external prestressing continuous girder bridge behind the first freely-supported according to claim 2, it is characterized in that: the described steering block (2) of striding is symmetricly set on diaphragm position in concrete beam second road, described external pre-stress bundle (3) is upwards bent up from this position, described pier top steering block (4) is arranged on concrete beam beam-ends position, and described external pre-stress bundle is bent up downwards from this position.
4. according to continuous external prestressing continuous girder bridge behind claim 2 or the 3 described first freely-supporteds, it is characterized in that: described stride a steering block (2) and pier top steering block (4) by the standard diaphragm strengthen, the thickening sectional dimension constitutes.
5. continuous external prestressing continuous girder bridge behind the first freely-supported according to claim 1 and 2, it is characterized in that: described concrete beam cuts section bar for the T type.
6. continuous external prestressing continuous girder bridge behind the first freely-supported according to claim 1 and 2, it is characterized in that: described external pre-stress bundle (3) comprises epoxy spraying steel strand (9), PE sleeve pipe (11), grease (12), described PE sleeve pipe (11) is sleeved on outside the described epoxy spraying steel strand (9), is filled with grease (12) between described PE sleeve pipe (11) and the described epoxy spraying steel strand (9).
7. continuous external prestressing continuous girder bridge behind the first freely-supported according to claim 1 and 2, it is characterized in that: described external pre-stress bundle (3) is gone up and is provided with vibration absorber (5) every 8-10m, and described damping device (5) is fixed on the concrete beam by pre-embedded steel slab (10).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205509956U CN201801806U (en) | 2010-09-30 | 2010-09-30 | Externally-prestressed continuous beam bridge with first simple supporting and second continuation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205509956U CN201801806U (en) | 2010-09-30 | 2010-09-30 | Externally-prestressed continuous beam bridge with first simple supporting and second continuation |
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| CN201801806U true CN201801806U (en) | 2011-04-20 |
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| CN2010205509956U Expired - Fee Related CN201801806U (en) | 2010-09-30 | 2010-09-30 | Externally-prestressed continuous beam bridge with first simple supporting and second continuation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107794813A (en) * | 2017-11-21 | 2018-03-13 | 中铁第四勘察设计院集团有限公司 | A kind of suspension type bottom plate opening combinations box prestressed rail beam system |
| CN111254797A (en) * | 2020-02-21 | 2020-06-09 | 西南交通大学 | Continuous beam bridge and method for determining section area of inhaul cable and rigidity of elastic body of continuous beam bridge |
| CN113512932A (en) * | 2021-03-19 | 2021-10-19 | 宁波市政工程建设集团股份有限公司 | Prestressed steel beam connected prefabricated small box girder type hidden cover beam and construction method thereof |
| CN114016387A (en) * | 2021-10-20 | 2022-02-08 | 长安大学 | Bridge anti-explosion device for preventing collapse |
| CN114991026A (en) * | 2022-06-02 | 2022-09-02 | 广州大学 | Simply-supported-to-continuous reinforcement structure and reinforcement method for old bridge |
-
2010
- 2010-09-30 CN CN2010205509956U patent/CN201801806U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107794813A (en) * | 2017-11-21 | 2018-03-13 | 中铁第四勘察设计院集团有限公司 | A kind of suspension type bottom plate opening combinations box prestressed rail beam system |
| CN107794813B (en) * | 2017-11-21 | 2024-02-23 | 中铁第四勘察设计院集团有限公司 | Suspended type bottom plate opening combined box type prestress track beam system |
| CN111254797A (en) * | 2020-02-21 | 2020-06-09 | 西南交通大学 | Continuous beam bridge and method for determining section area of inhaul cable and rigidity of elastic body of continuous beam bridge |
| CN111254797B (en) * | 2020-02-21 | 2021-08-10 | 西南交通大学 | Continuous beam bridge and method for determining section area of inhaul cable and rigidity of elastic body of continuous beam bridge |
| CN113512932A (en) * | 2021-03-19 | 2021-10-19 | 宁波市政工程建设集团股份有限公司 | Prestressed steel beam connected prefabricated small box girder type hidden cover beam and construction method thereof |
| CN114016387A (en) * | 2021-10-20 | 2022-02-08 | 长安大学 | Bridge anti-explosion device for preventing collapse |
| CN114991026A (en) * | 2022-06-02 | 2022-09-02 | 广州大学 | Simply-supported-to-continuous reinforcement structure and reinforcement method for old bridge |
| CN114991026B (en) * | 2022-06-02 | 2023-09-22 | 广州大学 | Old bridge simply supported variable continuous reinforcement structure and reinforcement method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110420 Termination date: 20120930 |