CN104314012B - A kind of cantilever box beam shelf bracket fastener attachment structure - Google Patents
A kind of cantilever box beam shelf bracket fastener attachment structure Download PDFInfo
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- CN104314012B CN104314012B CN201410497879.5A CN201410497879A CN104314012B CN 104314012 B CN104314012 B CN 104314012B CN 201410497879 A CN201410497879 A CN 201410497879A CN 104314012 B CN104314012 B CN 104314012B
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- bridge pier
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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
- E01D21/10—Cantilevered erection
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- Civil Engineering (AREA)
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- Bridges Or Land Bridges (AREA)
Abstract
The present invention provides a kind of cantilever box beam shelf bracket fastener attachment structure, relate to bridge construction technical field, including bridge pier, bridge pier bilateral symmetry arranges shelf bracket, it is provided with built-in fitting in described bridge pier, described shelf bracket is fixedly mounted on bridge pier sidewall by built-in fitting, connected by anchor system between the monosymmetric shelf bracket of bridge pier, it is connected by steel plate fastener pin between described built-in fitting and shelf bracket, between multiple shelf brackets of bridge pier the same side, connects into an entirety by lateral connection system.The present invention utilizes steel plate fastener pin to transmit load, improves shear resistance, stopped directly on built-in fitting welding and thermal cutting and cause concrete to be affected by thermal fracture, steel plate deformed.
Description
Technical field
The present invention relates to bridge construction technical field, particularly relate to a kind of cantilever box beam shelf bracket fastener even
Access node structure.
Background technology
Prestressed reinforced concrete continuous box girder is the upper structure type that bridge is conventional, and many employing Hanging Baskets are executed
Work method, as it is shown in figure 1,0# block part in pier top portion is the job platform of cradle assembly, the cantilevered out part of pier top
Bearing system can use shelf bracket version.The shear resistance of current existing bearing system is poor, holds
The bracket of weight system directly welds on built-in fitting, and concrete can be caused in work progress by thermal fracture, steel
Plate deformation etc. affect, and construction safety degree is low, construction quality is wayward.
Summary of the invention
It is an object of the invention to provide a kind of cantilever box beam shelf bracket fastener attachment structure, on solving
State technical problem.
The technical problem to be solved realizes by the following technical solutions:
A kind of cantilever box beam shelf bracket fastener attachment structure, it is characterised in that: include bridge pier, bridge pier two
Side is symmetrical arranged shelf bracket, is provided with built-in fitting in described bridge pier, and described shelf bracket passes through built-in fitting
It is fixedly mounted on bridge pier sidewall, is connected by anchor system between the monosymmetric shelf bracket of bridge pier,
It is connected by steel plate fastener pin between described built-in fitting and shelf bracket, multiple triangle torr of bridge pier the same side
An entirety is connected into by lateral connection system between frame.
Described shelf bracket is made up of crossbeam and diagonal brace, and diagonal brace lower end is connected tripod anchored end steel plate；Three
Angle bracket uses I-steel processing and fabricating, its quantity, by material specification, that model undertakes load according to bracket is big
Little determined by forcing checking.
Described built-in fitting includes that crossbeam built-in fitting and diagonal brace built-in fitting, described crossbeam built-in fitting include that pier shaft is pre-
Bury steel plate, pre-embedded steel slab anchoring piece and tie rod hole embedded steel tube, described pre-embedded steel slab anchoring piece is provided with
Four preformed holes, arrange a steel plate cotter way, described tie rod hole embedded steel tube two ends in the middle of four preformed holes
The preformed hole arranged on pre-embedded steel slab anchoring piece monosymmetric with bridge pier respectively is corresponding, and described diagonal brace is pre-buried
Part is identical with crossbeam embedded part structure.
Described steel plate fastener pin is arranged on the steel plate in the middle of tripod anchored end steel plate and pre-embedded steel slab anchoring piece
In cotter way, steel plate fastener pin uses steel plate to make；When shelf bracket is installed, steel plate fastener pin is embedded triangle
In the steel plate cotter way of frame anchored end steel plate and pre-embedded steel slab anchoring piece, steel plate cotter way is closely sealed, bears and cuts up and down
Cut load.
Described anchor system uses four finish rolling deformed bars through tie rod hole embedded steel tube, pre-embedded steel slab anchor
Firmware and tripod anchored end steel plate, anchor into an entirety by bridge pier with monosymmetric shelf bracket.
Described lateral connection system uses section steel material cross weld between shelf bracket to form frame structure.
Described section steel material mainly uses angle steel or channel-section steel.
Tripod anchored end steel plate of the present invention and pre-embedded steel slab anchoring piece middle part devise steel plate cotter way,
Placing steel plate fastener pin in steel plate cotter way, steel plate cotter way and steel plate fastener pin consistent size, on steel plate cotter way
Lower inwall and steel plate fastener pin top and bottom are smooth, add use man-hour cutting torches shaping after again
Milling is carried out smooth with lathe, tight with groove contact internal walls to guarantee when steel plate fastener pin embeds in steel plate cotter way
Close, uniform force.
Construction technology process:
Pier shaft built-in fitting is spelled → arranged in preparation of construction → bracket processing and examination, and (built-in fitting is accurately positioned, template
Installation, concrete placings, form removable, cleaning pre-embedded steel slab and duct) → steel plate fastener pin installation → triangle
Bracket installation → anchor system installation → lateral connection system installation → bottom side model sheetinstallat → bracket precompressed detection
→ 0# block part construction → removal bracket → pier shaft anchor point processes.
The invention has the beneficial effects as follows:
Utilize steel plate fastener pin to transmit load, improve shear resistance, stopped directly to weld on built-in fitting
Concrete is caused to be affected by thermal fracture, steel plate deformed with thermal cutting.
1, overall structure stress is clear and definite, for different structure cross dimensions and payload, applicable simply
Theory of mechanics carries out structural analysis and calculating.
2, utilize pier stud concrete anti-compression, section steel material tension, the characteristic of shearing resistance, play the property of material
Energy.Utilize steel plate fastener pin to transmit load, improve shear resistance, stopped directly to weld on built-in fitting
Concrete is caused to be affected by thermal fracture, steel plate deformed with thermal cutting.Using anchor Design, equipment exists
Special operation field machining accuracy is high, and assembling and disassembling is convenient and swift.
3, component is for being rigidly connected, and component stiffness by itself is big, and after overall stress, inelastic deformation is little, puts into
Using front precompressed test experience workload little, security is high, it is easy to control.
Accompanying drawing explanation
Fig. 1 is the skiagraph of shelf bracket and bridge；
Fig. 2 is the cross-sectional view of shelf bracket and bridge；
Fig. 3 is the front view of crossbeam built-in fitting；
Fig. 4 is the left view of crossbeam built-in fitting；
Fig. 5 is the front view of diagonal brace built-in fitting；
Fig. 6 is the left view of diagonal brace built-in fitting；
Fig. 7 is the stress sketch of shelf bracket.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and effect and be readily apparent from
Solve, below in conjunction with specific embodiments and the drawings, the present invention is expanded on further, but following embodiment is only
The preferred embodiments of the present invention, and not all.Based on the embodiment in embodiment, people in the art
Member's obtained other embodiments on the premise of not making creative work, broadly falls into the protection of the present invention
Scope.
As shown in Figure 1 and Figure 2, a kind of cantilever box beam shelf bracket fastener attachment structure, including bridge pier 1, bridge
Pier 1 bilateral symmetry arranges shelf bracket 4, is provided with built-in fitting 3 in bridge pier 1, and shelf bracket 4 passes through built-in fitting
3 are fixedly mounted on bridge pier 1 sidewall, between the monosymmetric shelf bracket of bridge pier 14 by anchor system 2 even
Connect, be connected by steel plate fastener pin between built-in fitting 3 with shelf bracket 4, multiple triangles of bridge pier 1 the same side
Connecting into an entirety by lateral connection system 5 between bracket 4, shelf bracket 4 is by crossbeam 41 and diagonal brace 42 structure
Becoming, diagonal brace 42 lower end is connected tripod anchored end steel plate 43.
As shown in Figure 3, Figure 4, a kind of crossbeam built-in fitting fastener attachment structure, including pier shaft pre-embedded steel slab 31,
Pre-embedded steel slab anchoring piece 32, pier shaft pre-embedded steel slab 31 welds together with pre-embedded steel slab anchoring piece 32, pre-buried
Offer four preformed holes 36 on steel plate anchoring piece 32, in the middle of four preformed holes 36, a steel plate cotter way is set
35；
Also include crossbeam 42 and be welded on the shelf bracket crossbeam end steel plate 43 of crossbeam 42 end, described triangle
Four corresponding with pre-embedded steel slab anchoring piece 32 preformed hole 36 and one is offered on yoke crosstie end steel plate 43
Steel plate cotter way 35, edge in the steel plate cotter way 35 of shelf bracket crossbeam end steel plate 43 and pre-embedded steel slab anchoring piece 32
Enter steel plate fastener pin 34, in the preformed hole 36 of shelf bracket crossbeam end steel plate 43 and pre-embedded steel slab anchoring piece 32
Through finish rolling deformed bar, the end of reinforcing bar is screwed by nut.
Described pier shaft pre-embedded steel slab arranges eight altogether, and every root length degree is all higher than 60cm, and thickness is 10mm.
As shown in Figure 5, Figure 6, a kind of diagonal brace built-in fitting fastener attachment structure, including pier shaft pre-embedded steel slab 31,
Pre-embedded steel slab anchoring piece 32, pier shaft pre-embedded steel slab 31 welds together with pre-embedded steel slab anchoring piece 32, pre-buried
Offer four preformed holes 36 on steel plate anchoring piece 32, in the middle of four preformed holes 36, a steel plate cotter way is set
35；
Also include diagonal brace 41 and be welded on the shelf bracket diagonal brace end steel plate 44 of diagonal brace 41 end, described triangle
Four corresponding with pre-embedded steel slab anchoring piece 32 preformed hole 36 and one is offered on yoke crosstie end steel plate 43
Steel plate cotter way 35, edge in the steel plate cotter way 35 of shelf bracket diagonal brace end steel plate 44 and pre-embedded steel slab anchoring piece 32
Enter steel plate fastener pin 34, in the preformed hole 36 of shelf bracket diagonal brace end steel plate 44 and pre-embedded steel slab anchoring piece 32
Through finish rolling deformed bar, the end of reinforcing bar is screwed by nut.
Described pier shaft pre-embedded steel slab arranges the six roots of sensation altogether, and every root length degree is all higher than 60cm, and thickness is 10mm.
Six roots of sensation pier shaft pre-embedded steel slab decile is in steel plate cotter way 35 both sides, and six roots of sensation pier shaft pre-embedded steel slab is parallel to each other,
And leaving gap between adjacent two, concrete can be filled into.
System forcing checking:
(1) shelf bracket crossbeam, the checking computations of diagonal brace bearing capacity, as shown in Figure 7.
Shelf bracket and pier stud anchored end is calculated according to 0# block device on shelf bracket crossbeam and entity loadometer
Counter-force FAX, FAZ, FBX, FBZ, the moment M that crossbeam, diagonal brace bear, according to formula σ=k (M/W+N/A) < f
Checking computations crossbeam, the tension of diagonal brace steel, resistance to compression, bending strength.In formula: k safety coefficient；M is horizontal
The moment of flexure that beam, diagonal brace bear；W crossbeam, the cross section resistance moment of diagonal brace material；N crossbeam, diagonal brace hold
The internal force being subject to, is calculated by anchored end counter-force；A crossbeam, the sectional area of diagonal brace material；F steel
Tension, resistance to compression, bending strength feasible value.
(2) steel plate preformed groove, fastener pin forcing checking
Steel plate preformed groove, fastener pin steel compression strength is checked according to formula σ=kFAZ (FBZ)/A < f.
In formula: k safety coefficient；FAZ, FBZ shelf bracket and the counter-force of pier stud anchored end；A steel plate is pre-
Stay groove or steel plate fastener pin pressure-bearing surface area；σ steel plate preformed groove, pin compression strength；Resisting of f steel
Compressive Strength feasible value.
Pre-embedded steel slab anchoring piece forcing checking
Design shear load can be met, in advance according to formula V=μ Asfsv/k checking computations built-in fitting shear load V
Embedded part Transducers Embedded in Concrete length must not be less than 60cm, and built-in fitting typically uses steel plate or reinforcing bar.In formula: k
Safety coefficient；V acts on the shear load of built-in fitting, and design shear load is equal to FAZ, FBZ；μ—
Coefficient of friction；As built-in fitting sectional area；Fsv steel shearing strength feasible value in concrete.
Plate size and the determination of thickness
Plate size is determined, plate size big according to the pressure formula kP/A=fcd that pier shaft concrete bears
Little must be fulfilled for crossbeam, diagonal brace, thread bar anchorage fixing structure design needs.In formula: k safety coefficient；
P steel plate bears pressure, calculates with counter-force FAX of diagonal brace junction, FBX according to crossbeam anchored end, crossbeam；
A plate size area；Fcd concrete compressive strength feasible value.
The maximal bending moment M that steel plate bears is calculated, according to formula according to structural arrangement formReally
Determining steel plate thickness, its thickness should meet preformed groove, fastener pin force request.In formula: t steel plate thickness；
K safety coefficient；The maximal bending moment that Mmax steel plate bears；F steel plate bending strength feasible value.
Construction technology process and key points for operation
1. construction technology process
Pier shaft built-in fitting is spelled → arranged in preparation of construction → bracket processing and examination, and (built-in fitting is accurately positioned, template
Installation, concrete placings, form removable, cleaning pre-embedded steel slab and duct) → steel plate fastener pin installation → triangle
Bracket installation → anchor system installation → lateral connection system installation → bottom side model sheetinstallat → bracket precompressed detection
→ 0# block part construction → removal bracket → pier shaft anchor point processes.
2. key points for operation
2.1 preparation of construction
It is familiar with design document, carries out personnel arrangement and material, equipment preparation.According to implementation construction organization
Design requires that workmen is confided a technological secret by tissue, grasps each working procedure key points for operation.
Smooth location at the construction field (site), makes bracket processing platform, and flat surface preferably forms with concreting,
End face flatness controls at ± 10mm, and length and width meet shelf bracket overall processing requirement, first presses on platform
The accurate setting-out of bracket design size, then blanking welding assembly；
2.2 measurement and positionings, setting-out
Design according to shelf bracket, when pier shaft concreting, built-in fitting and tie rod hole embedded steel tube are entered
Row is accurately positioned, setting-out, and employing is welded and fixed.
The making of 2.3 shelf brackets and installation
(1) shelf bracket
Shelf bracket material all uses common model I-steel, steel plate to make.Produce for reducing beam force
Maximal bending moment, crossbeam can be cantilevered out, and cantilevered out length is no more than 1/3rd of crossbeam overall length, and experience
Determine.Diagonal brace and pier shaft angle a general control are between 30 ° to 45 °.Diagonal brace is connected end with crossbeam and adopts
With being welded to connect, crossbeam, diagonal brace are by anchored end steel plate and pier shaft anchor connection.Shelf bracket is typically adding
On-site consolidation after the machine-shaping of workshop, to meet required precision.
(2) pier shaft built-in fitting is arranged
Built-in fitting includes pier shaft pre-embedded steel slab, pre-embedded steel slab anchoring piece and preformed hole steel pipe three part, pier shaft
Pre-embedded steel slab bears crossbeam, the shearing of diagonal brace transmission.Pier shaft pre-embedded steel slab is welded into pre-embedded steel slab anchoring piece
Entirety, pre-embedded steel slab anchoring piece uses thick 10mm × 600mm steel plate, the recessed pier in pre-embedded steel slab anchoring piece surface
Body side 30mm, shelf bracket blocks with concrete after removing, and blocking concrete match ratio is with pier shaft coagulation
Soil match ratio, to ensure that pier shaft integral color is consistent, good looking appearance.
4 diameter 50mm steel plate preformed holes are reserved in pre-embedded steel slab anchoring piece corner, and every two pieces of pier shaft both sides are corresponding
Arrange, with diameter 48mm fastener for connection conduct between the steel plate preformed hole of both sides correspondence pre-embedded steel slab anchoring piece
The preformed hole of anchoring finish rolling deformed bar, during for preventing from constructing, position is moved, steel pipe and steel plate preformed hole four
Week welding.Built-in fitting is pre-buried should be carried out after Pier Formwork is calibrated, and before casting concrete, steel pipe should be fixed,
Closure port of steel pipe, when preventing casting concrete, steel pipe is disturbed deformation and concrete enters.
(3) fastener and anchoring rod are installed
Pier shaft pre-embedded steel slab and shelf bracket anchored end steel plate middle part devise reserved fastener slots, slotted eye
Interior placement steel plate fastener pin, preformed groove and steel plate fastener pin consistent size, the upper and lower inwall of slotted eye and steel plate fastener
Part pin top and bottom are smooth, add and carry out milling with lathe again after using cutting torches shaping man-hour
Smooth, tight with groove contact internal walls to guarantee when steel plate fastener pin embeds in preformed groove, uniform force.
Pier shaft pre-embedded steel slab, the general 16mm to 40mm of bracket anchored end steel plate thickness, to ensure that steel plate has foot
Enough rigidity, uniform force.Steel plate fastener pin thickness is not less than pier shaft pre-embedded steel slab and bracket anchored end steel
Plate thickness sum.
A-frame anchored end steel plate coincide with pier shaft pre-embedded steel slab size, preformed hole etc., uses diameter 32mm
Shelf bracket is become an entirety by finish rolling screw thread with pier shaft anchor connection, and during anchoring, nut application boosting-rod is twisted
Tightly.
(4) Installation Considerations
1) finish rolling deformed bar is penetrated pier shaft, place crossbeam anchored end steel plate fastener pin, make steel plate fastener
Pin top and bottom become to shear shape compression, tighten finish rolling threaded screw.
2) for making upper and lower steel plate fastener pin stress simultaneously, shelf bracket diagonal brace anchoring end steel plate can be first with diagonal brace
Do not weld, it is compressed anchoring, at crossbeam anchored end and pier shaft with steel plate fastener pin, pre-embedded steel slab three
After anchoring, scene is welded again.Other shelf brackets are installed in place by same method.
3) constructed after removal bracket, in time surface, pier shaft pre-embedded steel slab position should have been carried out repair place
Reason, makes pier shaft specious.
2.4, according to design, with shaped steel by several groups of tripod lateral connection, form an entirety.At triangle
Lay bottom side form plate on bracket, utilize leveling wedge to adjust end template to design height.
2.5 precompressed detections
After shelf bracket is installed, organization design and site operation technical staff check, are confirmed whether symbol
Close design, make and installation requirement.
Loading precompressed on the end template laid, load and use sand pocket pile, weight is 1.2 times of load.
Arrange control point on end template, the axis of bracket and base plate limit, control point uses diameter 8mm length
20mm reinforcement fabrication, is welded on control point, carries out protection during preloading.
Precompressed divides zero load, 50% load, three grades of load weights of 100% load to detect its deflection, examines after being fully loaded with
Surveying 72 hours deflections, the detection period is at interval of 12 hours.Pre-compaction process is conscientiously observed fastener steel plate
Pin is engaged situation with supporting steel plate.
Arrange detection data, check deflection, it is determined whether meet design and construction requirement.
2.60# block is constructed
Shelf bracket precompressed completes, and removes prefabricating load, checks the technology such as template axis, size, elevation
Data, coating release agent, reinforcing bar, casting concrete are installed.
The general principle of the present invention, principal character and advantages of the present invention have more than been shown and described.One's own profession
Skilled person will appreciate that of industry, the present invention is not restricted to the described embodiments, above-described embodiment and explanation
The preference being only the present invention described in book, is not intended to limit the present invention, without departing from present invention essence
On the premise of god and scope, the present invention also has various changes and modifications, and these changes and improvements both fall within
In scope of the claimed invention.Claimed scope by appending claims and etc.
Effect thing defines.
Claims (5)
1. a cantilever box beam shelf bracket fastener attachment structure, it is characterised in that: include bridge pier, bridge pier
Bilateral symmetry arranges shelf bracket, is provided with built-in fitting in described bridge pier, and described shelf bracket is by pre-buried
Part is fixedly mounted on bridge pier sidewall, is connected by anchor system between the monosymmetric shelf bracket of bridge pier,
It is connected by steel plate fastener pin between described built-in fitting and shelf bracket, multiple triangle torr of bridge pier the same side
An entirety is connected into by lateral connection system between frame；
Described shelf bracket is made up of crossbeam and diagonal brace, and diagonal brace lower end is connected tripod anchored end steel plate；Institute
State built-in fitting include crossbeam built-in fitting and diagonal brace built-in fitting, described crossbeam built-in fitting include pier shaft pre-embedded steel slab,
Pre-embedded steel slab anchoring piece and tie rod hole embedded steel tube, described pre-embedded steel slab anchoring piece is provided with four and reserves
Hole, arranges a steel plate cotter way in the middle of four preformed holes, described tie rod hole embedded steel tube two ends respectively with bridge
The preformed hole arranged on pier monosymmetric pre-embedded steel slab anchoring piece is corresponding, described diagonal brace built-in fitting and crossbeam
Embedded part structure is identical.
Cantilever box beam shelf bracket fastener attachment structure the most according to claim 1, it is characterised in that:
Described steel plate fastener pin is arranged on the steel plate cotter way in the middle of tripod anchored end steel plate and pre-embedded steel slab anchoring piece
In, steel plate fastener pin uses steel plate to make.
Cantilever box beam shelf bracket fastener attachment structure the most according to claim 2, it is characterised in that:
Described anchor system uses four finish rolling deformed bars through tie rod hole embedded steel tube, pre-embedded steel slab anchoring piece
And tripod anchored end steel plate, bridge pier is anchored into monosymmetric shelf bracket an entirety.
Cantilever box beam shelf bracket fastener attachment structure the most according to claim 3, it is characterised in that:
Described lateral connection system uses section steel material cross weld between shelf bracket to form frame structure.
Cantilever box beam shelf bracket fastener attachment structure the most according to claim 4, it is characterised in that:
Described section steel material uses angle steel or channel-section steel.
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| CN201410497879.5A CN104314012B (en) | 2014-09-25 | 2014-09-25 | A kind of cantilever box beam shelf bracket fastener attachment structure |
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| CN201410497879.5A CN104314012B (en) | 2014-09-25 | 2014-09-25 | A kind of cantilever box beam shelf bracket fastener attachment structure |
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| CN104314012B true CN104314012B (en) | 2016-08-24 |
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Families Citing this family (8)
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| CN105839540B (en) * | 2016-04-29 | 2023-06-13 | 贵州大通路桥工程建设有限公司 | Setting method and composition structure of No. 0 section non-welding bracket of rigid frame bridge |
| CN105951610A (en) * | 2016-05-13 | 2016-09-21 | 中铁十七局集团第二工程有限公司 | Support structure assisting in cantilever beam construction and construction method |
| CN106702906A (en) * | 2016-12-09 | 2017-05-24 | 中铁八局集团昆明铁路建设有限公司 | Pre-pressing device for hanging baskets and pre-pressing method thereof |
| CN107574761A (en) * | 2017-09-27 | 2018-01-12 | 中交路桥技术有限公司 | Truss is connected in a kind of bridge incremental launching construction between pier to pull-type attachment means |
| CN109183620A (en) * | 2018-09-05 | 2019-01-11 | 广东省长大公路工程有限公司 | Telescoping bracket, steel box-girder hanging device and hanging method |
| CN109522594B (en) * | 2018-10-15 | 2023-04-18 | 南昌大学 | Method for analyzing concrete stress of beam body single-side jacking modulus type expansion joint anchoring area |
| CN109356035A (en) * | 2018-11-26 | 2019-02-19 | 中铁六局集团有限公司 | A kind of bracket, bridge pier and construction method |
| CN114960433A (en) * | 2022-05-16 | 2022-08-30 | 中国十九冶集团有限公司 | Construction method for pouring working block at top of pier of steel bridge |
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