CN106835932A - UHPC combined box beams - Google Patents
UHPC combined box beams Download PDFInfo
- Publication number
- CN106835932A CN106835932A CN201710214020.2A CN201710214020A CN106835932A CN 106835932 A CN106835932 A CN 106835932A CN 201710214020 A CN201710214020 A CN 201710214020A CN 106835932 A CN106835932 A CN 106835932A
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- China
- Prior art keywords
- uhpc
- base plate
- concrete
- combined box
- box beams
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
- C04B14/068—Specific natural sands, e.g. sea -, beach -, dune - or desert sand
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
Abstract
The invention provides a kind of UHPC combined box beams, including the box beam body enclosed by normal concrete multiaspect, the at least one side loading end of the box beam body is UHPC concrete, and the box beam body includes the base plate of the top board, web and UHPC concrete materials of normal concrete material.The present invention is reasonably changed and optimized to box section, and UHPC combined members are made by by component, it is had excellent service behaviour and economy concurrently.Show that the combined box beam ultimate flexural strength of UHPC base plates composition is about 2 times or so of common C60 concrete box girders by experiment and calculating.Steel using amount can be reduced using high tensile reinforcement simultaneously, the effect of economical environment-protective is reached.
Description
Technical field
The invention belongs to concrete box girder technical field, it is related to a kind of UHPC combined box beams.
Background technology
UHPC is a kind of super high strength high performance concrete, and for common high-strength concrete, UHPC has more preferable
Ductility, tensile strength and high compressive ultimate strength higher, because the limit of general goods concrete deformation ability and intensity
System, high tensile reinforcement can not fully play a role in reinforced concrete member, and this have impact on beams of concrete to a certain extent
Deck-molding in the span ability and concrete-bridge of bridge.At present, UHPC prices are of a relatively high, using total cross-section UHPC box beams simultaneously
It is uneconomical.
Used as a kind of conventional section form, the connection of traditional steel reinforced concrete combined box beam is easily destroyed box beam, and steel
Plate and concrete can not cooperate well.In the present invention UHPC combined box beams only need to the caking property of material itself just can be with
Ensure reliable connection and junction is survivable, good endurance.In addition UHPC has superelevation ultimate tensile strength, base plate UHPC
Can be cooperated with whole process with the regular reinforcement in it, it is ensured that UHPC also only has sightless micro-crack before reinforcement yielding, with biography
System concrete cracking is to exit work to produce greatest differences, will be a kind of brand-new structure type and design concept.Traditional is mixed
Solidifying soil box beam, the drawing-resistant function of concrete in tension zone is not counted in when anti-bending bearing capacity is calculated.In the present invention, held bending resistance is calculated
The tension contribution of tensile region UHPC is must take into consideration when carrying power.
The content of the invention
To overcome the defect existing for prior art, a kind of UHPC combined box beams are now provided, box section is carried out rationally
Ground modification and optimization, UHPC combined members are made by by component, it is had excellent service behaviour and economy concurrently.By reality
Test and calculate and show that the combined box beam ultimate flexural strength of UHPC base plates composition is about 2 times of left sides of common C60 concrete box girders
It is right.Steel using amount can be reduced using high tensile reinforcement simultaneously, the effect of economical environment-protective is reached.
To achieve the above object, solution of the invention is：A kind of UHPC combined box beams are provided, including by common coagulation
The box beam body that native multiaspect is enclosed, at least one side loading end of the box beam body is UHPC concrete.
Preferably, the box beam body includes top board, web and the UHPC concrete materials of normal concrete material
Base plate, the base plate and the web bonding connection.The connection of each component need not set attachment means or use WELDING STUDS, no
Need specially treated.
Preferably, high-strength bending resistance reinforcing bar is set in the base plate.
Preferably, the cross section around the box beam body is equipped with shearing resistance stirrup.
Preferably, set in addition to base plate outside high-strength bending resistance reinforcing bar, roof steel bar, distribution bar, stirrup are still using common
Reinforcing bar.
Preferably, the high-strength bending resistance reinforcing bar have it is multiple and be respectively arranged at the base plate and the top board with it is described
The junction of web, the shearing resistance stirrup is around lock ring on the multiple high-strength bending resistance reinforcing bar.
Preferably, the both ends that the base plate is connected with the web respectively to extending in plate face where the web and then
Form base plate corner.
Preferably, the shearing resistance stirrup encryption in the base plate corner.
Preferably, the base plate of the UHPC concrete materials contain cement 600-1200kg, mineral admixture 50-200kg,
Fine aggregate 800-1200kg, steel fibre 78-300kg, water reducer (solid content) 3-15kg, defoamer 0.6-5kg, swelling agent 60-
129kg, water 100-250kg.
Preferably, the mineral admixture includes active SiO2Mass percent is 48% to 77%, CaO mass percentages
Than being 0.1% to 40%, SO3Mass percent is 0.4% to 28%, Al2O3Mass percent is 0.2% to 7%；The ore deposit
The average grain diameter of thing admixture is 0.1 μm to 8.0 μm, and mineral admixture is the 10% to 40% of cement quality.
Preferably, the water reducer is comprising lignin water reducer, naphthalene series high-efficiency water-reducing agent, sulfamate high-effective diminishing
In agent or high performance water reducing agent of polyocarboxy acid it is a kind of or at least two mixing water reducer, the solid content quality of the water reducer is water
The 0.1% to 2.0% of mud and mineral admixture quality sum；The defoamer is to disappear comprising nonionic surfactant, organosilicon
In infusion and polymer defoamer it is a kind of or at least two mixture foam killer, the defoamer consumption is that cement and mineral are admixed
The 0.01% to 2% of material quality sum.
The beneficial effect of UHPC combined box beams of the present invention includes：
1st, the characteristics of having Self-leveling, self-compaction during the bottom slab concreting of concrete material in the box beam, it is not necessary to artificially scrape
Smear, save artificial.UHPC combined box beams only need normal temperature to conserve, and curing time is short, easy construction；
2nd, the base plate has tensile strength higher, and the service behaviour of combined box beam greatly improves, and routine coagulation
Native box beam is compared to bigger anti-bending bearing capacity.Need to count the drawing-resistant function of tensile region UHPC when calculating anti-bending bearing capacity,
And the use of suitable high-strength bending resistance reinforcing bar, and conventional concrete box beam is it is not recommended that using high tensile reinforcement；
3rd, this kind of compound section, experiment understands that its ultimate flexural strength is about common C60 concrete with result of calculation
2 times of material box beam.While anti-bending bearing capacity is greatly improved, shear-carrying capacity can be also improved, reason is：One side UHPC
Base plate can increase the compressive region of concrete so as to strengthen the shear resistance that former normal concrete cuts nip, and another aspect UHPC is also
Shearing strength (experiment proves shearing strength standard value 22MPa) with superelevation, itself can also improve shear resistance；
4 is different from normal concrete box beam, due to the superelevation ultimate tensile strength of UHPC, base plate UHPC with its in it is common
Reinforcing bar can be cooperated with whole process, it is ensured that UHPC also only has sightless micro-crack before reinforcement yielding, be ftractureed with conventional concrete
Exit work and produce greatest differences, will be a kind of brand-new structure type and design concept；
5th, in combined box beam, the connection of each component need not set attachment means or use WELDING STUDS, it is not necessary to special
Treatment, itself caking property by material can just provide reliable connection.Reduce the possibility that junction occurs problem.And subtract
Lack the operation for making, shorten the time；
6th, this kind of combined box beam, base plate UHPC good endurances, good waterproof performance is arranged in the base plate of box beam, can be preferably
Prevent the intrusion of extraneous etching condition, it is ensured that the more preferable durability of box beam.
Brief description of the drawings
Fig. 1 is the cross section structural representation of first embodiment in UHPC combined box beams of the present invention；
Fig. 2 is the cross section structural representation of second embodiment in UHPC combined box beams of the present invention.
Specific embodiment
The present invention is further illustrated below in conjunction with accompanying drawing illustrated embodiment.
Embodiment one：
As shown in figure 1, present invention firstly provides a kind of UHPC combined box beams, including enclosed by normal concrete multiaspect
Box beam body, at least one side loading end 3 of the box beam body is UHPC concrete.
Specifically, the box beam body includes top board 1, web 2 and the UHPC concrete materials of normal concrete material
Base plate 3, the base plate 3 and the bonding connection of the web 2.
More preferably, it is provided with high-strength bending resistance reinforcing bar 5 in the base plate 3.Cross section around the box beam body sets
It is equipped with shearing resistance stirrup 4.The high-strength bending resistance reinforcing bar 5 has multiple and is respectively arranged at the base plate 3 and the top board 1 and institute
The junction of web 2 is stated, the shearing resistance stirrup 4 is around lock ring on the multiple high-strength bending resistance reinforcing bar 5.
After with said structure feature, the present invention can be implemented by procedure below：
The top board 1 of cast in situs or prefabricating common concrete material, the web 2 of normal concrete material and UHPC materials
Base plate 3, wherein many configured along box beam length direction uniform intervals in shearing resistance stirrup 4 and base plate comprising the configuration of curved scissors position
High-strength bending resistance reinforcing bar 5.
The setting of the reinforcement cage skeleton of stirrup 4 and high tensile reinforcement 5 is first carried out at the scene, due to the strong coagulation of superelevation after shaping
Native UHPC base plates 3 have tensile strength higher, while there is the ultimate tensile strength more than regular reinforcement, can be whole with reinforcing bar
Cooperate, therefore be adapted to configuration high tensile reinforcement 5.Afterwards, the base plate 3 for carrying out UHPC materials is poured, bottom plate when pouring
The characteristics of inner concrete has Self-leveling is without artificial wiping.The junction of combined box beam can typically occur lasting hazard, and
And need setting shear key to be attached.Compared to steel-mixed combined box beam, combined box beam simple structure is mixed with common in the present invention
Solidifying soil box beam is similar to, junction by material itself cohesive force it is ensured that enough connection, it is not necessary to especially processed.
After the completion of bottom slab concreting, pouring for web 2 is carried out, the connection of web 2 and base plate 3 does not need specially treated, according to conventional coagulation
Soil connection treatment, the caking property of material itself ensures that reliable connection.In the present invention combined box beam connection and
Simple structure, workmen, compared to normal concrete box beam, greatly improves greatly without constructing operation by Special Training
Anti-bending strength and shear behavior.
The shearing resistance stirrup of setting is except the function with shearing resistance, the company between further each component of reinforcement combined box beam
Connect.
Embodiment two：
On the basis of embodiment one, the present embodiment has done further structure and has improved.Specifically, bottom is first carried out at the scene
The setting of the reinforcement cage skeleton of stirrup 4 and high tensile reinforcement 5 in plate 3, due to the super high strength concrete UHPC base plates tool after shaping
There is certain tensile strength, the reduction that the consumption of high tensile reinforcement 5 can be appropriate.Then the base plate 3 for carrying out UHPC materials is poured, and is poured
A bit of length at web 2 is extended to when building, and the reinforcing bar in extension is overlapped with the reinforcing bar in web 2, base plate mould
The characteristics of plate inner concrete has Self-leveling is without artificial wiping.After the completion of bottom slab concreting, pouring for web 2, the He of web 2 are carried out
The template of the connection section part of base plate 3 is not required to remake, and directly by the use of the end face of the extended spot of base plate 3 as template, connects
The stirrup 4 at the place of connecing is encrypted to ensure the reliability of connection, does not in addition need specially treated, is connected according to conventional concrete
Treatment, the caking property of material itself ensures that reliable connection.Due to being also provided with stirrup, top is further enhanced
Plate 1, the connection of web 2 and base plate 3, so the connectors such as WELDING STUDS need not be set.Serviceability limit stage, top board 1, the He of web 2
The junction of base plate 3 need not especially be processed.
Meanwhile, the present embodiment has also done refinement and has improved in material component proportioning.Specifically, every cubic metre of UHPC coagulations
Soil is included：Cement 600-1200kg, mineral admixture 50-200kg, fine aggregate 800-1200kg, steel fibre 78-300kg, diminishing
Agent (solid content) 3-15kg, defoamer 0.6-5kg, swelling agent 60-129kg, water 100-250kg.The cement is strength grade
42.5 and the portland cement or Portland cement of the above.The particle diameter of the fine aggregate is not more than 5mm, particle diameter in 1mm and
Fine aggregate below it accounts for the 42-100% of fine aggregate gross mass；The fine aggregate is quartz sand, river sand, sea sand, lime stone bone
A kind of at least two mixing in material, blast-furnace cinder fine aggregate, Copper Slag fine aggregate and electric furnace acidifying slag fine aggregate.Institute
Mineral admixture is stated to include：Active SiO2Mass percent is 48-77%, and CaO mass percents are 0.1-40%, SO3Quality hundred
Divide than being 0.4-28%, Al2O3Mass percent is 0.2-7%；The average grain diameter of the mineral admixture is 0.1-8.0 μm, ore deposit
Thing admixture is the 10-40% of cement quality.Described length of steel fiber is 6-25mm, a diameter of 0.1-0.3mm, volume volume
Scope is 1%-3%.The water reducer is comprising lignin water reducer, naphthalene series high-efficiency water-reducing agent, sulfamate high-effective diminishing
One kind or at least two mixing in agent or high performance water reducing agent of polyocarboxy acid；The solid content quality of the water reducer be cement and
The 0.1-2.0% of mineral admixture quality sum.The defoamer is comprising nonionic surfactant, organic silicon defoamer and gathers
One kind or at least two mixing in compound defoamer；The consumption of the defoamer is cement and mineral admixture quality sum
0.01-2%.The swelling agent is any one or two kinds of mixtures of material comprising calcium oxide, magnesia class swelling agent.
After completing above-mentioned implementation process, following characteristics of the invention should be able to be embodied：
1) UHPC prices are of a relatively high at present, using total cross-section UHPC box beams and uneconomical.So innovation of the present invention
Be to be combined normal concrete and UHPC, obtain better performance while ensure have enough economy.
2) show that the combined box beam ultimate flexural strength of UHPC base plates composition is about common C60 and mixes by experiment and calculating
2 times or so of solidifying soil box beam.The base plate 3 that super high strength concrete (UHPC) is poured has tensile strength higher, and intensity is in 10MPa
More than.The drawing-resistant function of consideration underplate concrete is needed when anti-bending bearing capacity is calculated, therefore the service behaviour of combined box beam is big
It is big to improve, with reference to the use of high tensile reinforcement, shear-carrying capacity can be improved.
3) while steel using amount can be reduced using high tensile reinforcement, the effect of economical environment-protective is reached.
4) at the scene in casting process, super high strength concrete (UHPC) have Self-leveling the characteristics of, it is this after pouring into template
Material can be dynamic according to the longitudinal irregularity potential barrier of template, and Automatic Levelling is carried out in template, and whole process is independent of artificial wiping.
5) ultra-high performance concrete used by this patent (UHPC) only needs normal temperature to conserve, it is to avoid the high temperature that traditional UHPC needs
Steam curing, is suitable for cast in situs, and can meet intensity and shrinkage and creep requirement.And can realize early strong (2 hours
30MPa), curing time is short, easy construction.
6) top board of the combined box beam, web and base plate are concrete material, just can be with using the caking property of itself
Constitute reliable connection, and the material of same nature can well solve common connection sex chromosome mosaicism in combination beam.Connection
Place is not provided with the conventional attachments such as WELDING STUDS, and junction is not susceptible to destruction.
7) UHPC superelevation ultimate tensile strength (>4000 microstrains,>Reinforcement yielding strain), base plate UHPC with its in it is general
Logical reinforcing bar can be cooperated with whole process, it is ensured that UHPC also only has sightless micro-crack before reinforcement yielding, is opened with conventional concrete
Split and exit work generation greatest differences, will be a kind of brand-new structure type and design concept.
8) base plate UHPC good endurances, good waterproof performance, are arranged in the base plate of box beam, can be better protected from extraneous corrosion bar
The intrusion of part, it is ensured that the more preferable durability of box beam.
The above-mentioned description to embodiment is to be understood that and apply this hair for ease of those skilled in the art
It is bright.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiment without by performing creative labour.Therefore, the invention is not restricted to above-described embodiment,
Those skilled in the art's announcement of the invention, does not depart from improvement that scope made and modification all should be in this hair
Within bright protection domain.
Claims (10)
1. a kind of UHPC combined box beams, it is characterised in that：Including the box beam body enclosed by normal concrete multiaspect, the box beam
At least one side loading end of body is UHPC concrete.
2. UHPC combined box beams according to claim 1, it is characterised in that：The box beam body includes normal concrete material
The base plate of the top board, web and UHPC concrete materials of matter, the base plate and the web bonding connection.
3. UHPC combined box beams according to claim 2, it is characterised in that：High-strength bending resistance steel is equipped with the base plate
Muscle.
4. UHPC combined box beams according to claim 3, it is characterised in that：Cross section around the box beam body wears
There is shearing resistance stirrup.
5. UHPC combined box beams according to claim 4, it is characterised in that：The high-strength bending resistance reinforcing bar has multiple and divides
The junction of the base plate and the top board and the web is not arranged in, and the shearing resistance stirrup is around lock ring in described in multiple
On high-strength bending resistance reinforcing bar.
6. UHPC combined box beams according to claim 5, it is characterised in that：The two ends that the base plate is connected with the web
Portion to extension in plate face where the web and then forms base plate corner respectively.
7. UHPC combined box beams according to claim 6, it is characterised in that：The shearing resistance in the base plate corner
Stirrup is encrypted.
8. UHPC combined box beams according to claim 2, it is characterised in that：The base plate of the UHPC concrete materials contains
Cement 600-1200kg, mineral admixture 50-200kg, fine aggregate 800-1200kg, steel fibre 78-300kg, water reducer (admittedly contain
Amount) 3-15kg, defoamer 0.6-5kg, swelling agent 60-129kg, water 100-250kg.
9. UHPC combined box beams according to claim 8, it is characterised in that：The mineral admixture includes active SiO2
Mass percent is that 48% to 77%, CaO mass percents are 0.1% to 40%, SO3Mass percent be 0.4% to 28%,
Al2O3Mass percent is 0.2% to 7%；The average grain diameter of the mineral admixture is 0.1 μm to 8.0 μm, mineral admixture
It is the 10% to 40% of cement quality.
10. UHPC combined box beams according to claim 8, it is characterised in that：The water reducer is comprising lignin diminishing
It is a kind of or at least two in agent, naphthalene series high-efficiency water-reducing agent, sulfamate high-effective water-reducing agent or high performance water reducing agent of polyocarboxy acid
Mixing water reducer, the solid content quality of the water reducer is the 0.1% to 2.0% of cement and mineral admixture quality sum；It is described
Defoamer is the mixing comprising a kind of in nonionic surfactant, organic silicon defoamer and polymer defoamer or at least two
Defoamer, the defoamer consumption is the 0.01% to 2% of cement and mineral admixture quality sum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710214020.2A CN106835932A (en) | 2017-04-01 | 2017-04-01 | UHPC combined box beams |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710214020.2A CN106835932A (en) | 2017-04-01 | 2017-04-01 | UHPC combined box beams |
Publications (1)
| Publication Number | Publication Date |
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| CN106835932A true CN106835932A (en) | 2017-06-13 |
Family
ID=59141946
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| CN201710214020.2A Pending CN106835932A (en) | 2017-04-01 | 2017-04-01 | UHPC combined box beams |
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| CN110467399A (en) * | 2019-09-10 | 2019-11-19 | 江西科技学院 | A kind of self-compacting concrete and preparation method thereof using Copper Slag |
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Application publication date: 20170613 |