CN103758031A - Method for manufacturing assembled type bridge pier by utilizing steel fiber reinforced self-compacting concrete - Google Patents
Method for manufacturing assembled type bridge pier by utilizing steel fiber reinforced self-compacting concrete Download PDFInfo
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Abstract
The invention discloses a method for manufacturing an assembled type bridge pier by utilizing steel fiber reinforced self-compacting concrete. The method comprises the steps of preparing the concrete, prefabricating bridge pier segments, assembling the bridge pier segments, fixing the bridge pier segments and the like. By the adoption of the assembled type bridge pier manufactured through the method, construction and pouring quality can be guaranteed, the construction efficiency of a bridge is enhanced, and the seismic performance of the bridge pier can also be improved. The assembled type bridge pier is made of certain steel fiber reinforced self-compacting concrete, the comprehensive power performance of the segments is superior, and seismic performance of connector parts is 2-3 times that of existing common concrete prefabricated segments under the condition that structures and sizes are equal. The bridge pier segments in the structure are assembled in the mode that a shear key is connected with a short reinforcing steel bar in an inserted mode, the shock resistance, pier energy consumption, post-earthquake restoration in potential plastic hinge areas between the segments and other seismic-area dynamic properties are superior, and the method can be applicable to construction of the bridge pier. By the adoption of the steel fiber reinforced self-compacting concrete, concrete on the surface of a finished bridge pier is not prone to cracking, and therefore durability is good.
Description
Technical field
The present invention relates to bridge construction construction field, a kind of method of utilizing Steel Fiber Reinforced Self-compacting Concrete to prepare assembling bridge pier stud of special design.
Background technology
At present, the pier stud that bridge substructure adopts, adopts ordinary reinforced concrete structure more, ordinary concrete, reinforcing bar, consists of.When construction, need assembling reinforcement at the scene, template is set, builds commercial concrete, after maintenance, reach instructions for use.Field operation requires larger place to place material and template, during concreting, need manually vibrate and guarantee compactness, the intensive joint area of reinforcing bar is built and often owed closely knit, the steel and concrete structure pier stud of finished product is when being subject to Moment, easy to crack, thereby causes pier stud durability to decline.
For addressing this problem, start to adopt the assembled Bridge Pier Structure System of precast segment both at home and abroad.The structural system of the assembled bridge pier of precast segment is completely at precasting yard processing and fabricating, dry (glueing joint seam) of field by using or wet joint form connect, the assembled complete prestressed stretch-draw that carries out forms pier stud overall structure, Site Welding and cast-in-place concrete workload have at utmost been reduced, be of value to quality control, accelerate construction speed, reduced the impact on traffic and surrounding enviroment, met the style of economic increase theme of environmental protection and energy saving low-carbon (LC).
But theory is calculated and be experimental results show that: the stem grafting seam section assembling bridge pier that adopts ordinary concrete to build, as joint only adopts concavo-convex shear connector, under seismic force effects, show following deficiency: 1, bridge pier sections joint area easily occurs clashing into damage, and the concrete spalling of joint location is serious; Between 2, the shock resistance of bridge abutment integral, pier shaft power consumption, sections, after potential areas of plasticity hinge shake, repairing equidynamic can be not good enough, should not be for the earthquake district that takes place frequently; 3, finished product pier stud surface concrete easily ftractures, and durability has much room for improvement.
For above-mentioned deficiency, the invention provides a kind of method of utilizing certain Steel Fiber Reinforced Self-compacting Concrete to prepare assembling bridge pier stud, can overcome above-mentioned technological deficiency.
Summary of the invention
In view of this, the object of this invention is to provide a kind of method of utilizing Steel Fiber Reinforced Self-compacting Concrete to prepare assembling bridge pier stud, adopt the special steel fiber self-dense concrete of independent development, between segmental joints, use shear connector and bar dowel, the prefabricated subsection of gained and assembled after pier shaft there is good power performance, there is good energy dissipation capacity simultaneously, can postpone the concrete cracking in potential plastic hinge region between sections, significantly improve member anti-crack ability and durability, better protect the safety of sections member and pier shaft, can meet the earthquake designing requirement of the special geological surroundings such as district to the assembled bridge pier of precast segment that take place frequently.
The object of the invention is to solve by following technological means: a kind of method of utilizing Steel Fiber Reinforced Self-compacting Concrete to prepare assembling bridge pier stud, comprises the following steps:
A, configuration concrete, concrete technology is:
A, is equipped with concrete raw material by following weight portion proportioning: 300-350 parts of cement, 190-205 parts, I level flyash, fineness modulus is 765-775 parts of 2.3-3 medium sands, 900-910 parts of the rubbles of continuous grading, 8-9 parts of water reducing agents, 39-40 parts of water-soluble steel fibres, 180-185 parts, water;
B, prepare self-compaction steel fibrous concrete: by rubble obtained in a and medium sand feed intake mix evenly after, add cement and I level flyash, after mix is even, in mixture, add water gradually, add after 1/2nd water yields, add water reducing agent, add gradually again residue 1/2nd water, until mixture is even; Finally throw steel fibre, mix evenly;
B, precast pier sections: assembling reinforcement cage on platform, the mode of building with shuttering is prepared the first bridge pier sections, when self-compaction steel fibrous concrete is built, can not use the facility that vibrate, avoid steel fibre to produce directionality, then by the maintenance of precast pier sections to design strength; By that analogy, build other sections, and carried out numbering mark;
C, on-site consolidation: build cushion cap at both allocations, according to the order of mark in advance, bridge pier sections is installed successively on cushion cap, stretch-draw prestressing force forms whole pier stud, if any bent cap, can be by itself and cushion cap, pier shaft stretch-draw anchor together.
Further, the volume fraction of described water-soluble steel fibre is that the equivalent diameter of 0.3%-0.6%, steel fibre is that 0.1-0.3mm, draw ratio are 40-70, the tensile strength of steel fibre is not less than 1000MPa.
Further, in step a, by following weight portion proportioning, be equipped with concrete raw material: 330 parts of cement, I level flyash 200, part, 768 parts of the medium sands that fineness modulus is 2.3-3,902 parts of the rubbles of continuous grading, 8.46 parts of water reducing agents, 39.25 parts of water-soluble steel fibres, 181.5 parts, water.
Further, described bridge pier sections comprises bridge pier sections body, and the top of bridge pier sections body is along being circumferentially provided with bar dowel, and bottom is along being circumferentially provided for inserting spacing preformed hole for bar dowel, and the bore dia of described preformed hole is greater than the diameter of bar dowel; One end of bridge pier sections body arranges shear connector, and the other end arranges shear connector groove; Described bridge pier sections body is along a plurality of presstressed reinforcing steel holes of axially running through are circumferentially set.
Further, in step C, pre-buried bar dowel and shear connector groove on cushion cap base, then put into groove by the shear connector of the first bridge pier sections bottom, and pre-buried bar dowel inserts in preformed hole, the like; After all in place, presstressed reinforcing steel is carried out to prestressed stretch-draw and anchoring through presstressed reinforcing steel hole.If any bent cap, between bent cap and adjacent bridge pier sections, only insert independent bar dowel.
Further, the height of described shear connector is identical with the degree of depth of shear connector groove, puts into rear docking and coincide good.
Further, described bridge pier sections body is hollow-core construction.
Further, in step B, locate for convenience shear connector and bar dowel hole, the 2nd sections can the 1st sections end face be that template is built, and the rest may be inferred by analogy for it.
Further, in step B, in carrying out multi-segmental preparation process, the bridge pier sections of having built can be hung, only retain adjacent sections as building support platform.
Beneficial effect of the present invention: the invention provides the method for utilizing Steel Fiber Reinforced Self-compacting Concrete to prepare assembling bridge pier stud, this pier stud can guarantee construction casting quality, can reduce operation again artificial, and can obviously improve the anti-seismic performance of bridge.Through actual verification, effect is remarkable: the special steel fiber concrete that 1, adopts independent development, by bridge pier mechanics and force structure, analyze, in conjunction with experiment repeatedly, adjust each raw material ratio, the assembled bridge pier sections comprehensive mechanical property of preparing with it is superior, and under equivalent constructions and comparable size condition, the anti-seismic performance of joint area is 2-3 times of existing ordinary concrete prefabricated subsection; 2, adopt the bridge pier sections of this structure, use shear connector to carry out spacing, by inserting the joint style of bar dowel, undertaken assembled especially, between the shock resistance of bridge abutment integral, pier shaft power consumption, sections, potential areas of plasticity hinge is shaken the earthquake region dynamic performance superiorities such as rear reparation, can be used for earthquake region bridge pier column construction; 3, adopt this kind of steel fibrous concrete, finished product pier stud surface concrete is not easy to crack, good endurance.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the splicing structure schematic diagram of adjacent bridge pier sections of the present invention;
Fig. 2 is the plan structure schematic diagram of bridge pier sections of the present invention;
Fig. 3 is the structural representation of looking up of bridge pier sections of the present invention.
The specific embodiment
Below with reference to accompanying drawing, the present invention is described in detail:
A, configuration concrete, concrete technology is:
A, is equipped with concrete raw material by following weight portion proportioning: cement 300kg, I level flyash 205kg, the medium sand 765kg that fineness modulus is 2.3, the rubble 910kg of continuous grading; The particle diameter of the rubble of this continuous grading is determined according to reinforcing bar gap, according to standard value; Water reducing agent 9kg, water-soluble steel fibre 39kg, water 185kg; Wherein, the volume fraction of described water-soluble steel fibre is that the equivalent diameter of 0.3%-0.6%, steel fibre is that 0.1-0.3mm, draw ratio are 40-70, the tensile strength of steel fibre is not less than 1000MPa.
B, prepare self-compaction steel fibrous concrete: by rubble obtained in a and medium sand feed intake mix evenly after, add cement and I level flyash, after mix is even, in mixture, add water gradually, add after 1/2nd water yields, add water reducing agent, add gradually again residue 1/2nd water, until mixture is even; Finally throw steel fibre, mix evenly;
B, precast pier sections: assembling reinforcement cage on platform, the mode of building with shuttering is prepared the first bridge pier sections, when self-compaction steel fibrous concrete is built, can not use the facility that vibrate, avoid steel fibre to produce directionality, then by the maintenance of precast pier sections to design strength; By that analogy, build other sections, and carried out numbering mark;
C, on-site consolidation: build cushion cap at both allocations, according to the order of mark in advance, bridge pier sections is installed successively on cushion cap, stretch-draw prestressing force forms whole pier stud, if any bent cap, can be by itself and cushion cap, pier shaft stretch-draw anchor together.
The structure of the sections of bridge pier described in step B comprises bridge pier sections body 1, the top of bridge pier sections body is along being circumferentially provided with bar dowel 2, bottom is along being circumferentially provided for inserting spacing preformed hole 3 for bar dowel 2, and the bore dia of described preformed hole is greater than the diameter of bar dowel; One end of bridge pier sections body arranges shear connector 4, and the other end arranges shear connector groove 5; Described bridge pier sections body is along a plurality of presstressed reinforcing steel holes 6 of axially running through are circumferentially set;
In step C, pre-buried bar dowel and shear connector groove on cushion cap base, then put into groove by the shear connector of the first bridge pier sections bottom, and pre-buried bar dowel inserts in preformed hole, the like; After all in place, presstressed reinforcing steel 7 is carried out to prestressed stretch-draw and anchoring through presstressed reinforcing steel hole 6; Sometimes according to stressed needs, when bar dowel is run through to several sections, need in sections, reserve through hole, bar dowel has interted rear mud jacking and has filled preformed hole.
If any bent cap, between bent cap and adjacent bridge pier sections, only insert independent bar dowel.
As preferred version, the height of described shear connector 4 is preferably identical with the degree of depth of shear connector groove 5, puts into rear docking and coincide good.Described bridge pier sections body 1 is hollow-core construction, can alleviate sections weight and save material, guarantees its compressive strength simultaneously.In step B, locate for convenience shear connector and bar dowel hole, the 2nd sections can the 1st sections end face be that template is built, and the rest may be inferred by analogy for it.In step B, in carrying out multi-segmental preparation process, the bridge pier sections of having built can be hung, only retain adjacent sections as building support platform; The method can reduce prefabricated construction height, reduces difficulty of construction, is conducive to guarantee the quality of bridge pier sections, and the combination that guarantees adjacent two bridge pier sections closely and pier shaft verticality.
Embodiment 3, as optimum embodiment, be with the difference of embodiment 1: in step a, by following weight portion proportioning, be equipped with concrete raw material: cement 330kg, I level flyash 200kg, the medium sand 768kg that fineness modulus is 2.3-3, the rubble 902kg of continuous grading, water reducing agent 8.46kg, water-soluble steel fibre 39.25kg, water 181.5kg.
Different from the assembly pier structure of mentioning in background technology, described bridge pier sections comprises bridge pier sections body 1, be vertically set on bar dowel and the shear connector groove of bridge pier sections bodies top, the reserved bar dowel hole and the shear connector that in adjacent bridge pier sections body bottom, axially arrange; Described bar dowel and shear connector are along the circumferential setting of pier segment cross; The bore dia in described reserved bar dowel hole is greater than the diameter of bar dowel, guarantees the comprehensive mechanical property of potential plastic hinge region between sections.When assembled, pre-buried bar dowel and shear connector groove on cushion cap base, then put into groove by the shear connector of the first bridge pier sections bottom, and pre-buried bar dowel inserts in preformed hole, the like.If any bent cap, between bent cap and adjacent bridge pier sections, only insert bar dowel.After all in place, carry out prestressed stretch-draw and anchoring, avoid the excessive horizontal shift of intersegmental generation of seismic force effects time, good reliability; Between the power consumption of the shock resistance of bridge abutment integral, pier shaft, sections, after potential areas of plasticity hinge shake, repairing equidynamic can be superior, is applicable to the earthquake district's bridge construction that takes place frequently.
The assembling bridge pier stud that adopts special steel fiber self-dense concrete of the present invention to prepare, can guarantee construction casting quality, can reduce operation again artificial, and can obviously improve the anti-seismic performance of bridge.Adopt raw material and the special preparation technique of this special proportioning, the assembled bridge pier sections of gained comprehensive mechanical property is superior, by bridge pier mechanics and force structure, analyze, under equivalent constructions and comparable size condition, the anti-seismic performance of joint area is 2-3 times of existing ordinary concrete prefabricated subsection; The bridge pier sections of this structure, use shear connector to carry out spacing, the special joint style by slotting bar dowel carries out assembled, and between the shock resistance of bridge abutment integral, pier shaft power consumption, sections, potential areas of plasticity hinge is shaken the earthquake region dynamic performance superiorities such as rear reparation, can be used for earthquake region bridge pier column construction; Finished product pier stud surface concrete is not easy to crack, good endurance.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. utilize Steel Fiber Reinforced Self-compacting Concrete to prepare a method for assembling bridge pier stud, it is characterized in that: comprise the following steps:
A, configuration concrete, concrete technology is:
A, is equipped with concrete raw material by following weight portion proportioning: 300-350 parts of cement, 190-205 parts, I level flyash, fineness modulus is 765-775 parts of 2.3-3 medium sands, 900-910 parts of the rubbles of continuous grading, 8-9 parts of water reducing agents, 39-40 parts of water-soluble steel fibres, 180-185 parts, water;
B, prepare self-compaction steel fibrous concrete: by rubble obtained in a and medium sand feed intake mix evenly after, add cement and I level flyash, after mix is even, in mixture, add water gradually, add after 1/2nd water yields, add water reducing agent, add gradually again residue 1/2nd water, until mixture is even; Finally throw steel fibre, mix evenly;
B, precast pier sections: assembling reinforcement cage on platform, the mode of building with shuttering is prepared the first bridge pier sections, when self-compaction steel fibrous concrete is built, can not use the facility that vibrate, avoid steel fibre to produce directionality, then by the maintenance of precast pier sections to design strength; By that analogy, build other sections, and carried out numbering mark;
C, on-site consolidation: build cushion cap at both allocations, according to the order of mark in advance, bridge pier sections is installed successively on cushion cap, stretch-draw prestressing force forms whole pier stud.
2. preparation method according to claim 1, is characterized in that: the volume fraction of described water-soluble steel fibre is that the equivalent diameter of 0.3%-0.6%, steel fibre is that 0.1-0.3mm, draw ratio are 40-70, the tensile strength of steel fibre is not less than 1000MPa.
3. preparation method according to claim 1, it is characterized in that: in step a, by following weight portion proportioning, be equipped with concrete raw material: 330 parts of cement, 200 parts, I level flyash, fineness modulus is 768 parts of 2.3-3 medium sands, 902 parts of the rubbles of continuous grading, 8.46 parts of water reducing agents, 39.25 parts of water-soluble steel fibres, 181.5 parts, water.
4. preparation method according to claim 1, it is characterized in that: described bridge pier sections comprises bridge pier sections body (1), the top of bridge pier sections body is along being circumferentially provided with bar dowel (2), bottom is along being circumferentially provided for inserting spacing preformed hole (3) for bar dowel (2), and the bore dia of described preformed hole is greater than the diameter of bar dowel; One end of bridge pier sections body arranges shear connector (4), and the other end arranges shear connector groove (5); Described bridge pier sections body is along a plurality of presstressed reinforcing steel holes (6) of axially running through are circumferentially set.
5. preparation method according to claim 4, is characterized in that: in step C, pre-buried bar dowel and shear connector groove on cushion cap base, then put into groove by the shear connector of the first bridge pier sections bottom, and pre-buried bar dowel inserts in preformed hole, the like; After all in place, presstressed reinforcing steel (7) is carried out to prestressed stretch-draw and anchoring through presstressed reinforcing steel hole (6).
6. preparation method according to claim 4, is characterized in that: the height of described shear connector (4) is identical with the degree of depth of shear connector groove (5), puts into rear docking and coincide good.
7. preparation method according to claim 4, is characterized in that: described bridge pier sections body (1) is hollow-core construction.
8. preparation method according to claim 1, is characterized in that: in step B, locate for convenience shear connector and bar dowel hole, the 2nd sections can the 1st sections end face be that template is built, and the rest may be inferred by analogy for it.
9. preparation method according to claim 1, is characterized in that: in step B, in carrying out multi-segmental preparation process, the bridge pier sections of having built can be hung, only retain adjacent sections as building support platform.
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