CN109024271A - Limit the construction method of the built-in concrete beam bridge steel reinforced concrete anchoring piece of Local Cracking - Google Patents
Limit the construction method of the built-in concrete beam bridge steel reinforced concrete anchoring piece of Local Cracking Download PDFInfo
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- CN109024271A CN109024271A CN201810635205.5A CN201810635205A CN109024271A CN 109024271 A CN109024271 A CN 109024271A CN 201810635205 A CN201810635205 A CN 201810635205A CN 109024271 A CN109024271 A CN 109024271A
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- steel
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- presstressed reinforcing
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- 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
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention discloses a kind of built-in concrete beam bridge steel reinforced concrete anchoring piece for limiting Local Cracking, the trapezoidal cabinet being made of steel lower plate, preceding steel facing and rear steel facing, upper steel side plate and lower steel side plate；Trapezoidal cabinet is separated into three Room by two blocks of steel webs in trapezoidal cabinet, is upper chamber, middle room, lower room respectively；Middle interior setting presstressed reinforcing steel corrugated conduit, corrugated conduit end connect the presstressed reinforcing steel hole reserved on steel lower plate, and fines concrete fills up the cavity of three Room.The component takes full advantage of the biggish rigidity of steel and concrete structure and good tensile property, and solving situations such as concrete slab stress is concentrated, prestressed anchorage zone transverse component is excessive causes structure the phenomenon that Local Cracking occur.The present invention is suitable for the concrete-bridge engineering practice that municipal bridge, Long span Box Beam Bridge etc. have larger prestressing tendon.
Description
Technical field
The invention belongs to the concrete Local Cracking repairing and reinforcement technical field of concrete-bridge more particularly to a kind of limitations
The built-in concrete beam bridge steel reinforced concrete anchoring piece and its construction method of Local Cracking.
Background technique
It will lead to bridge due to prestressed anchorage zone stress is concentrated, prestressing force transverse component is excessive etc. in concrete-bridge
Local Cracking situation occurs for beam concrete.With the development of Modern Traffic infrastructure, more and more large-sized concrete municipal administration bridges
Beam, Long span Box Beam Bridge occur, and bridge occurs that the case where local cracks is also more and more, and crack is excessive, will lead to
Bridge safty, applicability, durability are restricted.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of built-in concrete beam bridge steel reinforced concrete anchors for limiting Local Cracking
To limit bridge prestress anchorage zone Local Cracking occurs for firmware and its construction method, improve the safety of bridge, applicability,
Durability.
In order to solve the above technical problems, the invention adopts the following technical scheme:
The built-in concrete beam bridge steel reinforced concrete anchoring piece for limiting Local Cracking, is by steel lower plate, preceding steel facing and rear steel
The trapezoidal cabinet of panel, upper steel side plate and lower steel side plate composition；Trapezoidal cabinet is separated by two blocks of steel webs in trapezoidal cabinet
Three Room are upper chamber, middle room, lower room respectively；Middle interior setting presstressed reinforcing steel corrugated conduit, corrugated conduit end connects steel lower plate
Upper reserved presstressed reinforcing steel hole, fines concrete fill up the cavity of three Room.
Welded-Stud Conectors are arranged in the surface of trapezoidal cabinet, to be fixedly connected with concrete slab.
Presstressed reinforcing steel built in presstressed reinforcing steel corrugated conduit, presstressed reinforcing steel one end are fixed on trapezoidal box by the tensioning of prestressing force anchor slab
Bottom end on body, the presstressed reinforcing steel other end pass through the presstressed reinforcing steel hole of steel lower plate.
Preceding steel facing and rear steel facing are identical isosceles trapezoid.
Welded-Stud Conectors on steel facing and rigid side plate meet following equation:
2(nm×Vsud+sinθncVsud)≥fpd
In formula:
fpdFor the design prestress value of presstressed reinforcing steel；
nmFor the peg number arranged on the steel facing of side；
ncFor the peg number arranged on the steel side plate of side；
θ is the inferior horn angle of steel facing isosceles trapezoid；
VsudFor the shear resistant capacity of single WELDING STUDS；
Wherein,
In formula:
AsConnector bar portion area of section (mm is followed closely for weldering2)；
EcFor modulus of elasticity of concrete (MPa)；
fcdFor concrete axial compressive strength design value (MPa)；
γ is the ratio between peg Tensile strength minimum value and yield strength；
F is peg tensile strength design value.
Trapezoidal cabinet upper bottom surface plate bearing capacity meets following equation:
Acfc×s≥fpd
In formula:
S is confined effect coefficient；
AcFor trapezoidal upper bottom surface concrete area；
fcFor concrete crushing strength design value.
The construction method of the built-in concrete beam bridge steel reinforced concrete anchoring piece of above-mentioned limitation Local Cracking, operates according to the following steps
It carries out:
1) steel lower plate, preceding steel facing and rear steel facing, upper steel side plate and lower steel side plate and two blocks of steel webs are welded into shape
At the trapezoidal cabinet with three Room, three Room are upper chamber, middle room, lower room respectively, and are connected in trapezoidal cabinet surface external weld stud
Fitting；
2) in middle indoor setting presstressed reinforcing steel corrugated conduit, and particulate connection gradation is perfused in trapezoidal cabinet and fills coagulation
Soil fills up cavity, and carries out concrete curing, molding component；
3) lifting components are at the prestressing tendon of bridge subsection and concrete anchoring, by the presstressed reinforcing steel bellows of appearance with
Pipe fitting at component hole connects (see Fig. 6)；
4) bridge concrete is poured, after whole maintenance 7-10 days, tensioned prestressing bar；
5) when tensioned prestressing bar, presstressed reinforcing steel is passed through into bellows, is tensioned presstressed reinforcing steel with prestressing force anchor slab.
Bridge concrete anchorage zone occur crack aiming at the problem that, inventor devise it is a kind of limitation Local Cracking it is built-in
Formula concrete beam bridge steel reinforced concrete anchoring piece is made of steel lower plate, preceding steel facing and rear steel facing, upper steel side plate and lower steel side plate
Trapezoidal cabinet；Trapezoidal cabinet is separated into three Room by two blocks of steel webs in trapezoidal cabinet, is upper chamber, middle room, lower room respectively；In
Indoor setting presstressed reinforcing steel corrugated conduit, corrugated conduit end connect the presstressed reinforcing steel hole reserved on steel lower plate, particulate coagulation
Soil fills up the cavity of three Room.The component takes full advantage of the biggish rigidity of steel and concrete structure and good tensile property, solves mixed
Situations such as concrete board stress is concentrated, prestressed anchorage zone transverse component is excessive causes structure the phenomenon that Local Cracking occur.According to
This, inventor has also set up corresponding construction method.Steel reinforced concrete anchoring piece tensioned prestressing bar in concrete bodies, presstressed reinforcing steel run through
Steel lower plate, can also be by setting Welded-Stud Conectors and concrete bodies one-piece casting, and connectivity is good, uniform force, and structure is closed
Reason.The present invention is suitable for the concrete-bridge engineering that municipal bridge, Long span Box Beam Bridge etc. have larger prestressing tendon
Practice.
Detailed description of the invention
Fig. 1 is using overall plan view of the invention.
Fig. 2 is the structural schematic diagram of the built-in concrete beam bridge steel reinforced concrete anchoring piece of present invention limitation Local Cracking.
Fig. 3 is the Welded-Stud Conectors arrangement of the built-in concrete beam bridge steel reinforced concrete anchoring piece of present invention limitation Local Cracking
Figure.
Fig. 4 is to install the state diagram that concrete slab in place does not pour using anchoring piece when the present invention.
Fig. 5 is the state diagram using anchoring piece and concrete slab one-piece casting when the present invention.
Fig. 6 is the state diagram using anchoring piece tensioned prestressing bar when the present invention.
Fig. 7 is that the overall dimensions of the built-in concrete beam bridge steel reinforced concrete anchoring piece of invention limitation Local Cracking show
It is intended to.
In figure: 1 concrete slab, 2 fill concretes, 4 presstressed reinforcing steel preformed holes, 5 solid anchor firmwares, 6 steel side plates, 7 steel abdomens
Plate, 8 Welded-Stud Conectors, 9 prestressing force anchor slabs, 10 presstressed reinforcing steels, 12 steel facings, 13 steel lower plates, 14 corrugated conduits, 15 upper limbs
Edge, 16 lower flanges, 17 main piers, 18 presstressed reinforcing steel anchored ends.
Specific embodiment
Embodiment
Certain rigid frame bridge finds to find largely on the web near at waveform anchoring along bellows behind 4 segments of constructing
Crackle, subsequent crackle further occurs in order to prevent, and owner requires, and the segment 5-6 web prestressing tendon anchors the done plate in position
It is designed, constructed using the present invention referring to aforementioned anchoring piece and its construction method.No. 5-6 web prestressing force is 350kN,
Steel anchor box size is designed on web, as shown in fig. 7, wherein steel case thickness 25cm, trapezoidal upper bottom width 70cm, lower bottom width 130cm, height
For 140cm, panel thickness 16mm, external WELDING STUDS uses 4.6 grades of 22 pegs of φ, interior filling C60 particulate continuous grading coagulation
Soil.
It calculates: 1. WELDING STUDS shear-carrying capacity: 2 (nm×Vsud+sinθncVsud)≥350kN；
2. trapezoidal upper plate bearing capacity: Acfc×s≥350kN。
Peg material property grade is 4.6 grades, takes f=215 (N/mm), γ=1.67；C60 concrete, it may be assumed that Ec=3.6
×104, fcd=27.5N/mm2
2(nm×Vsud+sinθηcVsud)=2 (31 × 103.40+sin 77.9 × 18 × 103.40)=10050.5kN >=
350kN；
Acfc× s=700 × 250 × 27.5 × 1.05=5053.13kN >=350kN.
This project meets design requirement, in the segment 5-6 using the present invention, does not observe after stretch-draw prestressing force along ripple
The web crackle of pipe.
Claims (7)
1. a kind of built-in concrete beam bridge steel reinforced concrete anchoring piece for limiting Local Cracking, it is characterised in that be by steel lower plate, preceding
The trapezoidal cabinet of steel facing and rear steel facing, upper steel side plate and lower steel side plate composition；By two blocks of steel webs in the trapezoidal cabinet
Trapezoidal cabinet is separated into three Room, is upper chamber, middle room, lower room respectively；The middle indoor setting presstressed reinforcing steel corrugated conduit, ripple
Pipe end connects the presstressed reinforcing steel hole reserved on steel lower plate, and fines concrete fills up the cavity of three Room.
2. the built-in concrete beam bridge steel reinforced concrete anchoring piece of limitation Local Cracking according to claim 1, it is characterised in that:
Welded-Stud Conectors are arranged in the surface of the trapezoidal cabinet.
3. the built-in concrete beam bridge steel reinforced concrete anchoring piece of limitation Local Cracking according to claim 1, it is characterised in that:
Presstressed reinforcing steel built in the presstressed reinforcing steel corrugated conduit, presstressed reinforcing steel one end are fixed on trapezoidal cabinet by the tensioning of prestressing force anchor slab
Bottom end, the presstressed reinforcing steel other end pass through the presstressed reinforcing steel hole of steel lower plate.
4. the built-in concrete beam bridge steel reinforced concrete anchoring piece of limitation Local Cracking according to claim 1, it is characterised in that:
The preceding steel facing and rear steel facing are identical isosceles trapezoid.
5. the built-in concrete beam bridge steel reinforced concrete anchoring piece of limitation Local Cracking according to claim 1, it is characterised in that:
Welded-Stud Conectors on the steel facing and rigid side plate meet following equation:
2(nm×Vsud+sinθncVsud)≥fpd
In formula:
fpdFor the design prestress value of presstressed reinforcing steel；
nmFor the peg number arranged on the steel facing of side；
ncFor the peg number arranged on the steel side plate of side；
θ is the inferior horn angle of steel facing isosceles trapezoid；
VsudFor the shear resistant capacity of single WELDING STUDS；
Wherein,
In formula:
AsConnector bar portion area of section is followed closely for weldering；
EcFor modulus of elasticity of concrete；
fcdFor concrete axial compressive strength design value；
γ is the ratio between peg Tensile strength minimum value and yield strength；
F is peg tensile strength design value.
6. the built-in concrete beam bridge steel reinforced concrete anchoring piece of limitation Local Cracking according to claim 1, it is characterised in that:
The trapezoidal cabinet upper bottom surface plate bearing capacity meets following equation:
Acfc×s≥fpd
In formula:
S is confined effect coefficient；
AcFor trapezoidal upper bottom surface concrete area；
fcFor concrete crushing strength design value.
7. limiting the construction method of the built-in concrete beam bridge steel reinforced concrete anchoring piece of Local Cracking, feature described in claim 1
It is to operate progress according to the following steps:
1) steel lower plate, preceding steel facing and rear steel facing, upper steel side plate and lower steel side plate and two blocks of steel webs are welded and forms tool
There is the trapezoidal cabinet of three Room, three Room are upper chamber, middle room, lower room respectively, and in trapezoidal cabinet surface external weld stud connector；
2) in middle indoor setting presstressed reinforcing steel corrugated conduit, and particulate connection gradation fill concrete is perfused in trapezoidal cabinet and fills out
Full cavity, and carry out concrete curing, molding component；
3) lifting components are at the prestressing tendon of bridge subsection and concrete anchoring, by the presstressed reinforcing steel bellows and component of appearance
Pipe fitting connection at hole；
4) bridge concrete is poured, after whole maintenance 7-10 days, tensioned prestressing bar；
5) when tensioned prestressing bar, presstressed reinforcing steel is passed through into bellows, is tensioned presstressed reinforcing steel with prestressing force anchor slab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810635205.5A CN109024271B (en) | 2018-06-20 | 2018-06-20 | Construction method of built-in concrete beam bridge steel-concrete anchor capable of limiting local cracking |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810635205.5A CN109024271B (en) | 2018-06-20 | 2018-06-20 | Construction method of built-in concrete beam bridge steel-concrete anchor capable of limiting local cracking |
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| CN109024271A true CN109024271A (en) | 2018-12-18 |
| CN109024271B CN109024271B (en) | 2020-05-15 |
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Citations (8)
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|---|---|---|---|---|
| JPH0978529A (en) * | 1995-09-08 | 1997-03-25 | Kaimon:Kk | Control device built-in elastic support device for up-lift and horizontal force |
| KR100840190B1 (en) * | 2007-12-10 | 2008-06-23 | 노윤근 | I-beam segment connection method equipped with prestress steel synthetic concrete upper flange for continuous bridge |
| JP2008266910A (en) * | 2007-04-17 | 2008-11-06 | Kajima Corp | Projection structure of anchorage or deviator of tendon, and construction method therefor |
| CN203559354U (en) * | 2013-11-06 | 2014-04-23 | 中铁第一勘察设计院集团有限公司 | Stay cable anchoring structure applied to prestressed concrete partially cable-stayed bridge |
| JP5703081B2 (en) * | 2011-03-25 | 2015-04-15 | 新日鉄住金エンジニアリング株式会社 | Fixing structure and fixing structure |
| CN204530477U (en) * | 2015-03-24 | 2015-08-05 | 湖南大学 | The external prestressing anchor structure of ultra-high performance concrete Thin-walled Box Girder |
| CN108103960A (en) * | 2017-12-12 | 2018-06-01 | 湖北工业大学 | A kind of bent cap external prestressing strengthening expansion anchorage box and reinforcement means |
| CN208604499U (en) * | 2018-06-20 | 2019-03-15 | 广西大学 | Limit the built-in concrete beam bridge steel reinforced concrete anchoring piece of Local Cracking |
-
2018
- 2018-06-20 CN CN201810635205.5A patent/CN109024271B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0978529A (en) * | 1995-09-08 | 1997-03-25 | Kaimon:Kk | Control device built-in elastic support device for up-lift and horizontal force |
| JP2008266910A (en) * | 2007-04-17 | 2008-11-06 | Kajima Corp | Projection structure of anchorage or deviator of tendon, and construction method therefor |
| KR100840190B1 (en) * | 2007-12-10 | 2008-06-23 | 노윤근 | I-beam segment connection method equipped with prestress steel synthetic concrete upper flange for continuous bridge |
| JP5703081B2 (en) * | 2011-03-25 | 2015-04-15 | 新日鉄住金エンジニアリング株式会社 | Fixing structure and fixing structure |
| CN203559354U (en) * | 2013-11-06 | 2014-04-23 | 中铁第一勘察设计院集团有限公司 | Stay cable anchoring structure applied to prestressed concrete partially cable-stayed bridge |
| CN204530477U (en) * | 2015-03-24 | 2015-08-05 | 湖南大学 | The external prestressing anchor structure of ultra-high performance concrete Thin-walled Box Girder |
| CN108103960A (en) * | 2017-12-12 | 2018-06-01 | 湖北工业大学 | A kind of bent cap external prestressing strengthening expansion anchorage box and reinforcement means |
| CN208604499U (en) * | 2018-06-20 | 2019-03-15 | 广西大学 | Limit the built-in concrete beam bridge steel reinforced concrete anchoring piece of Local Cracking |
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