CN109778664A - A kind of lightweight prestressed concrete beam bridge structure - Google Patents
A kind of lightweight prestressed concrete beam bridge structure Download PDFInfo
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- CN109778664A CN109778664A CN201910216285.5A CN201910216285A CN109778664A CN 109778664 A CN109778664 A CN 109778664A CN 201910216285 A CN201910216285 A CN 201910216285A CN 109778664 A CN109778664 A CN 109778664A
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Abstract
The invention discloses lightweight prestressed concrete beam bridge structures, including beam ontology, beam ontology is UHPC structural member, several retarded adhesive prestressed steel beams are equipped in beam ontology, each retarded adhesive prestressed steel beam includes sheath and the steel strand wires that are located therein, and slow setting adhesive is filled between steel strand wires and sheath.With the lightweight beam bridge structure, UHPC can effectively improve the drag in beam ontology unit area section, retarded adhesive prestressed steel beam is cooperated not need the reserving hole channel when beam ontology makes, grouting, lashing etc., it is small compared with existing structure diameter to reach retarded adhesive prestressed steel beam under equivalent effect power, UHPC plate is done thin, to reduce beam ontology sectional dimension, reduce UHPC and amount of reinforcement, so that 40%-60% is effectively reduced in the self weight of beam ontology, even if UHPC cost is expensive compared with normal concrete, but the beam ontology and support of lightweight, bridge pier, the larger reduction of the size and material utilization amount of the substructures such as basis, so that entire science of bridge building has extremely strong economy, great popularization.
Description
Technical field
The present invention relates to bridge field, in particular to a kind of lightweight prestressed concrete beam bridge structure.
Background technique
Common freely-supported concrete box-beam bridge domestic and international at present, is mostly post-tensioned prestressing concrete beam, material is
Normal concrete and prestress wire, since normal concrete compression and tensile strength is lower, ductility is poor, shrinkage and creep effect
The disadvantages of obvious, causes beam body section and thickness larger, and amount of reinforcement is more；According to statistics, its dead load of concrete box-beam bridge
The exhausted big specific gravity (more than 85%) of resultant action effect is accounted for, and this bigger ratio of across footpath is in nonlinear increase, conventional concrete
The intensity overwhelming majority be used for itself in-fighting, strongly limit the scope of application of beam bridge.
Biggish beam body size and weight cause the size of the substructures such as the support being adapted to it, bridge pier, basis with
And material utilization amount must also increase with it, and the beam for being required to seek a kind of lightweight is considered from girder construction self weight and engineering globality,
Mitigate the problem of bridge self weight is designer's urgent need to resolve.
Summary of the invention
It is an object of the invention to overcome the existing prestressed concrete beam in the presence of the prior art, due to common coagulation
The disadvantages of native compression and tensile strength is lower, ductility is poor, shrinkage and creep effect is obvious, causes beam body section and thickness larger, steel
Muscle dosage is more, biggish beam size and weight cause the size of the substructures such as the support being adapted to it, bridge pier, basis with
And material utilization amount also must biggish above-mentioned deficiency therewith, a kind of lightweight prestressed concrete beam bridge structure is provided.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical schemes:
A kind of lightweight prestressed concrete beam bridge structure, including beam ontology, the beam ontology are UHPC (Ultra-High
Performance Concrete, ultra-high performance concrete) structural member, it is retarded adhesive prestressed that several are equipped in the beam ontology
Steel beam, each retarded adhesive prestressed steel beam include sheath and several steel strand wires being located therein, all steel strand wires
Slow setting adhesive is filled between the sheath.
Wherein, the particular number of the retarded adhesive prestressed steel beam according to the specific structure mechanics feature of the beam ontology and
Material parameter is determined.
Using a kind of lightweight prestressed concrete beam bridge structure of the present invention, the resistance to compression of UHPC superelevation, tensile strength,
The excellent properties such as good durability and toughness and lower Creep Coefficient can effectively improve beam ontology unit area section
Drag cooperates retarded adhesive prestressed steel beam not need reserving hole channel, grouting, lashing etc. when beam ontology makes, reaches same work
Retarded adhesive prestressed steel beam is small compared with existing structure diameter under firmly, UHPC plate is done thin, to reduce beam ontology
Sectional dimension reduces UHPC and amount of reinforcement, so that 40%-60% is effectively reduced in the self weight of beam ontology, even if UHPC cost is more general
Logical concrete is expensive, but the size of the substructures such as the beam ontology and support of lightweight, bridge pier, basis and material utilization amount are larger
It reduces, so that entire science of bridge building has extremely strong economy, great popularization.
Preferably, the beam ontology is simply supported beam, and the beam ontology includes top plate, web and bottom plate, the web and institute
It states bottom plate and is equipped with the retarded adhesive prestressed steel beam.
Preferably, the beam ontology is continuous beam, and the beam ontology includes top plate, web and bottom plate, the top plate, described
Web and the bottom plate are equipped with the retarded adhesive prestressed steel beam.
Preferably, the beam ontology is box beam, T-type beam, plate-girder, I-beam or trough girder.
Preferably, the slow setting adhesive is mortar or adhesive.
Preferably, the different ratio control retarded adhesive prestressed steel beam of the slow setting adhesive solidifies tack time.
Preferably, the material of the sheath is PE (Polyethylene, polyethylene) material.
Preferably, the sheath is in corrugated tube shape.
Preferably, the beam ontology is thermal curing structural member or steam curing structural member.
Preferably, the diameter of steel strand wires described in each retarded adhesive prestressed steel beam is 10mm-30mm.
Preferably, the lightweight prestressed concrete beam bridge structure can be used in simply supported girder bridge, continuous rigid frame bridge, arch bridge, tiltedly
Draw bridge and suspension bridge.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
With a kind of lightweight prestressed concrete beam bridge structure of the present invention, the resistance to compression of UHPC superelevation, tensile strength,
The excellent properties such as good durability and toughness and lower Creep Coefficient can effectively improve beam ontology unit area section
Drag cooperates retarded adhesive prestressed steel beam not need reserving hole channel, grouting, lashing etc. when beam ontology makes, reaches same work
Retarded adhesive prestressed steel beam is small compared with existing structure diameter under firmly, UHPC plate is done thin, to reduce beam ontology
Sectional dimension reduces UHPC and amount of reinforcement, so that 40%-60% is effectively reduced in the self weight of beam ontology, even if UHPC cost is more general
Logical concrete is expensive, but the size of the substructures such as the beam ontology and support of lightweight, bridge pier, basis and material utilization amount are larger
It reduces, so that entire science of bridge building has extremely strong economy, great popularization.
Detailed description of the invention
Fig. 1 is the section structure diagram of existing simple prestressed concrete beam；
Fig. 2 is the stress diagram of Fig. 1 center sill structure；
Fig. 3 is a kind of section structure diagram of lightweight simple prestressed concrete beam of the present invention；
Fig. 4 is the stress diagram of Fig. 3 center sill structure.
Marked in the figure: 1- beam ontology, 2- top plate, 3- web, 4- bottom plate, the retarded adhesive prestressed steel beam of 5-, 6- prestress steel
Beam.
Specific embodiment
Below with reference to test example and specific embodiment, the present invention is described in further detail.But this should not be understood
It is all that this is belonged to based on the technology that the content of present invention is realized for the scope of the above subject matter of the present invention is limited to the following embodiments
The range of invention.
Embodiment
As shown in Figure 1, existing simple prestressed concrete beam, including beam ontology 1, the beam ontology 1 are common coagulation
Native C50 structural member, the beam ontology 1 include top plate 2, web 3 and bottom plate 4, and each web 3 is set there are four prestressed strand
6, the bottom plate 4 is set there are five the prestressed strand 6.
Wherein, when making the beam ontology 1, reserving hole channel is needed, penetrates steel beam in duct, grout filling duct,
Tensioning steel beam forms the prestressed strand 6 in the beam ontology 1；It is wanted since prestressed concrete beam predominantly standardizes construction
Ask control, the protective layer thickness between 6 channel surfaces of prestressed strand and 1 body structure surface of beam ontology, in the beam
1 structure top surface of ontology and side are no less than one times of duct outer diameter, and are not less than 50mm；The beam ontology 1 uses φ 15- φ
The steel strand wires of 15.2mm, Ying Caiyong 90mm internal diameter, the metal bellows duct of 97mm outer diameter, since duct outer diameter is greater than 55mm,
It is no less than 0.8 times of duct outer diameter by code requirement duct clear distance, i.e., described 6 center of prestressed strand is away from least 1.8 × 97
=174.6mm takes spacing 180mm；1.5 × 97=of distance structure surface is answered by 6 center line of prestressed strand described in code requirement
145.5mm, thus taking 3 minimum thickness of web is 300mm, beam-ends section is such as used due to the control of anchorage size
YJM15-15 anchorage, spiral bar diameter phi K is 335mm under anchor, in addition regular reinforcement and protection thickness in the web 3
Degree, 3 thickness 530mm of the web, 2 thickness 420mm of the top plate, the 4 thickness 600mm of the bottom plate of the 1 beam-ends position of beam ontology；This
Outer post stretching steel beam hole road is controlled box beam width and top plate thickness etc., is finally taken case due to the requirement such as spacing and tensioning space
The wide 7100mm of beam bridge floor, the wide 3200mm of case, 2 thickness 220mm of the top plate, the 4 thickness 250mm of the bottom plate, the abdomen of spaning middle section
3 thickness 300mm of plate.
As shown in Fig. 2, the stress diagram of above-mentioned existing simple prestressed concrete beam, 1 proof stress of beam ontology are
The minimum compression of span centre upper limb 11.9MPa maximum crushing stress and span centre lower edge 1.6MPa allows maximum pressure to answer according to specification
Power are as follows: 0.5 × 33.5=16.75MPa, allowing maximum tension stress is 0.7 × 3.1=2.17MPa, this is because resistance to compression, tension
The poor decision of ability, calculate 1 gross weight of beam ontology be 3800kN.
By bending resistance the moment of inertia calculation formulaIt is found that beam body rigidity mainly determines that plate thickness is to rigidity by deck-siding, deck-molding
Influence very little；If existing simple prestressed concrete beam design directlys adopt UHPC, 1 intensity of beam ontology is substantially improved,
UHPC dosage and amount of reinforcement can theoretically be greatly decreased, but due to using traditional rear tension prestress technology, prestressed pore passage
And anchorage element 1 construction size of beam ontology is required it is stringent, for the smooth lashing for guaranteeing the prestressed strand 6,
Channel diameter is larger, and to meet specification detailing requiments, 6 spacing of prestressed strand is larger, and with the 1 structure side of beam ontology
Edge leads to the increase of the 1 structure plate thickness of beam ontology and size, not with existing normal concrete structural member difference apart from larger
Greatly, UHPC and the amount of reinforcement for optimizing the beam ontology 1 are extremely difficult, it is difficult to achieve the purpose that 1 loss of weight of beam ontology.
As shown in figure 3, a kind of lightweight simple prestressed concrete beam of the present invention, including beam ontology 1, the beam
Ontology 1 is UHPC structural member, and the beam ontology 1 includes top plate 2, web 3 and bottom plate 4, each web 3 and the bottom plate 4
It is equipped with retarded adhesive prestressed steel beam 5, each retarded adhesive prestressed steel beam 5 includes sheath and several steel being located therein
Twisted wire is filled with slow setting adhesive between all steel strand wires and the sheath.
Since the retarded adhesive prestressed steel beam 5 is just directly embedded in it when the beam ontology 1 makes, Liang Benti 1
Reserving hole channel and grouting, lashing etc. are not needed, thus in the case where reaching equivalent effect power, the retarded adhesive prestressed steel
The diameter of beam 5 is much smaller than the outer diameter 97mm in metal bellows duct, so that 3 thickness of web of the beam ontology 1 is much smaller than
300mm。
The diameter of each of each retarded adhesive prestressed steel beam 5 steel strand wires is 28.6mm, outside the sheath
Diameter is 40mm, since the outer diameter sheath is less than 55mm, by the shield of the adjacent retarded adhesive prestressed steel beam 5 of code requirement
Set surface distance is no less than 40mm, i.e., adjacent retarded adhesive prestressed 5 center of steel beam takes away from least 40+40=80mm
Spacing 80mm；Distance structure sealer thickness is not less than 1 times of outer diameter, i.e. 1.5 × 40=60mm, thus takes the web 3
Minimum thickness is 120mm, and the top plate 2, the web 3, the bottom plate 4 of spaning middle section take 120mm.
Compared to existing simple prestressed concrete beam more as shown in Figure 1, due in the web 3 and the bottom plate 4
Retarded adhesive prestressed 5 spacing of steel beam reduces, and can suitably increase the number of the retarded adhesive prestressed steel beam 5, such as Fig. 3 institute
Show, retarded adhesive prestressed steel beam 5 described in 8 beams is set in each web 3 in the present embodiment, 9 beam institutes are set in the bottom plate 4
State retarded adhesive prestressed steel beam 5.
Beam-ends section due to anchorage size control, using the low retraction anchor of steel strand wires described in corresponding nominal diameter 28.6mm
Tool, anchor plate consider anchor plate minimum spacing and concrete side surface to anchor plate center away from it having a size of 180 × 180mm
Between minimum range etc. require, the 3 thickness 200mm of the web of the 1 beam-ends position of beam ontology, the top plate 2 thickness 200mm are described
4 thickness 260mm of bottom plate, it is 250km/h that the beam ontology 1, which designs speed per hour, and code requirement beam body vertical deflection limit value is L/1400, institute
It is 0.011m < 32/1400=0.023m that it is lower, which to state the effect of 1 static live load of beam ontology, therefore 1 rigidity of beam ontology meets specification and wants
It asks.
As shown in figure 4, the stress diagram of lightweight simple prestressed concrete beam of the present invention, the beam ontology 1 is controlled
Stress is the minimum compression of span centre upper limb 11.7MPa maximum crushing stress and span centre lower edge 0.5MPa, calculates to obtain the beam ontology 1
Gross weight is 1850kN, loss of weight 51.3%.
With a kind of lightweight prestressed concrete beam bridge structure of the present invention, the resistance to compression of UHPC superelevation, tensile strength,
The excellent properties such as good durability and toughness and lower Creep Coefficient can effectively improve 1 unit area section of beam ontology
Drag, cooperate retarded adhesive prestressed steel beam 5 not need reserving hole channel, grouting, lashing etc. when beam ontology 1 makes, reach same
The effects of power under retarded adhesive prestressed steel beam 5 it is small compared with existing structure diameter, UHPC plate is done thin, to reduce beam
1 sectional dimension of ontology reduces UHPC and amount of reinforcement, so that 40%-60% is effectively reduced in the self weight of beam ontology 1, even if UHPC makes
Valence is expensive compared with normal concrete, but the size of the substructures such as the beam ontology 1 and support of lightweight, bridge pier, basis and material are used
Larger reduction is measured, so that entire science of bridge building has extremely strong economy, great popularization.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of lightweight prestressed concrete beam bridge structure, including beam ontology (1), which is characterized in that the beam ontology (1) is
UHPC structural member, the beam ontology (1) is interior equipped with several retarded adhesive prestressed steel beams (5), each described retarded adhesive prestressed
Steel beam (5) includes sheath and several steel strand wires for being located therein, filled with slow between all steel strand wires and the sheath
Solidifying adhesive.
2. lightweight prestressed concrete beam bridge structure according to claim 1, which is characterized in that the beam ontology (1) is
Simply supported beam, the beam ontology (1) include top plate (2), web (3) and bottom plate (4), and the web (3) and the bottom plate (4) are all provided with
There is the retarded adhesive prestressed steel beam (5).
3. lightweight prestressed concrete beam bridge structure according to claim 1, which is characterized in that the beam ontology (1) is
Continuous beam, the beam ontology (1) include top plate (2), web (3) and bottom plate (4), the top plate (2), the web (3) and institute
It states bottom plate (4) and is equipped with the retarded adhesive prestressed steel beam (5).
4. lightweight prestressed concrete beam bridge structure according to claim 1, which is characterized in that the beam ontology (1) is
Box beam, T-type beam, plate-girder, I-beam or trough girder.
5. lightweight prestressed concrete beam bridge structure according to claim 1, which is characterized in that the slow setting adhesive is
Mortar or adhesive.
6. lightweight prestressed concrete beam bridge structure according to claim 1, which is characterized in that the beam ontology (1) is
Thermal curing structural member or steam curing structural member.
7. lightweight prestressed concrete beam bridge structure according to claim 1-6, which is characterized in that each described
The diameter of steel strand wires described in retarded adhesive prestressed steel beam (5) is 10mm-30mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112982730A (en) * | 2021-03-16 | 2021-06-18 | 北京工业大学 | Self-resetting wall with tuning-swinging-friction composite grading energy consumption function |
| CN114808656A (en) * | 2022-05-27 | 2022-07-29 | 长江勘测规划设计研究有限责任公司 | Method for reducing creep deflection of concrete beam |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112982730A (en) * | 2021-03-16 | 2021-06-18 | 北京工业大学 | Self-resetting wall with tuning-swinging-friction composite grading energy consumption function |
| CN112982730B (en) * | 2021-03-16 | 2022-05-31 | 北京工业大学 | Self-resetting wall with tuning-swinging-friction composite grading energy consumption function |
| CN114808656A (en) * | 2022-05-27 | 2022-07-29 | 长江勘测规划设计研究有限责任公司 | Method for reducing creep deflection of concrete beam |
| CN114808656B (en) * | 2022-05-27 | 2023-10-24 | 长江勘测规划设计研究有限责任公司 | Method for reducing creep deflection of concrete beam |
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