CN109736202A - Great cantilever bent cap Bracket method for construction method - Google Patents
Great cantilever bent cap Bracket method for construction method Download PDFInfo
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- CN109736202A CN109736202A CN201910051141.9A CN201910051141A CN109736202A CN 109736202 A CN109736202 A CN 109736202A CN 201910051141 A CN201910051141 A CN 201910051141A CN 109736202 A CN109736202 A CN 109736202A
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Abstract
The invention discloses a kind of great cantilever bent cap Bracket method for construction methods, stress of the cantilever end to fixing end is dispersed to pier shaft by the carrier structure that the up-side down triangle that factory's customization can be recycled is used on the basis of original punching pin stick engineering method and pre-buried bracket engineering method, this research is starting point solving large cantilever bent cap, consider practice of construction situation, by constantly calculating, analyzing, Test Summary design it is a set of can be used in using non-console bearing great cantilever bent cap construction.This engineering method is customized and is recycled bracket by factory, is achieved the purpose that quickening progress saves material, is increased the safety coefficient of similar construction, reduce difficulty of construction and period.The traffic pressure that is open to traffic below works is reduced, there is good social benefit and economic benefit.
Description
Technical field
The present invention relates to a kind of great cantilever bent cap Bracket method for construction methods.
Background technique
Large cantilever bent cap be usually along with modern bridge construction cross a river or on the life across existing road or complicated landform,
Complicated landform causes very big difficulty to traditional setting up for console mode steel pipe Bailey truss.These places need that this is arranged
Framed bent pier should not be arranged without being inherently based on lower section condition using framed bent pier routine bent cap in the irregular large cantilever bent cap of class
And the technical adjustment done.Therefore, this research safety is reliable, economical rationality, and the non-console of short time limit becomes construction
The most important thing of such works.It is very more that previous form of construction work is restricted factor, is whether lower section has ready conditions progress first
Floor-type support, followed by conventional punching pin stick set up simply supported beam (large-scale I-steel, Bailey beam) support system in cantilever end
Whether end deflection deformation can satisfy design and code requirement, be finally the bracket that can be competent at long cantilever construction, pre-buried
Can waste of material caused by fashioned iron is finally cut off avoid.
Summary of the invention
The invention proposes a kind of great cantilever bent cap Bracket method for construction methods regarding to the issue above, to accelerate Coping Construction
Speed reduces artificial and material cost, alleviates the current pressure in lower section or overcomes the unfavorable spy for setting up steel pipe Bailey truss in lower section
Point.Specifically adopt the following technical scheme that
A kind of great cantilever bent cap Bracket method for construction method, comprising the following steps:
For reserving hole for being inserted into rod iron, preformed hole is pre-buried using embedded pvc pipe pore-forming on pier shaft when pier stud is constructed
It need to ensure that pipeline is straight when pvc pipe；
After the completion of pier stud construction, pier body formwork is removed, carries out Coping Construction after pier shaft concrete reaches design strength,
Pier shaft preformed hole is cleared up first, then sundries in cleaning hole is sling rod iron level to preformed hole, human assistance with
The method for the formula that tolls a bell penetrates in preformed hole, is adjusted after penetrating rod iron to rod iron front-rear position, guarantees that length is exposed in pier shaft two sides
Spend it is identical, in order to avoid rod iron to one stretch out；
Positioning box is inserted in after rod iron installation is accurate, positioning box also needs to sling cooperation human assistance installation, positioning box set
It is adjacent to pier shaft face after entering and screwing on bolt prevents positioning box from rotating, to wearing finish rolling deformed bar then after the installation of two lateral brackets is in place
Tighten two sides nut；
Power transmission bracket is inserted in after rod iron installation is accurate, power transmission bracket need to equally sling cooperation human assistance installation, power transmission ox
Leg is adjacent to pier shaft face and gasket is added after being inserted in screws on nut, and rod iron both ends need to carry out simultaneously when installation, and pay attention to preventing rod iron
It slides back and forth, both ends power transmission bracket is installed rear bolt and box spanner is first used to be pre-tightened with a lesser power.
The present invention uses factory's customization on the basis of original punching pin stick engineering method and pre-buried bracket engineering method and can recycle
Stress of the cantilever end to fixing end is dispersed to pier shaft by the carrier structure of the up-side down triangle used, this research is solving large cantilever lid
Beam is starting point, considers practice of construction situation, and by constantly calculating, analyzing, Test Summary designs and a set of can be used in adopting
With the construction of non-console bearing great cantilever bent cap.This engineering method is customized and is recycled bracket by factory, is reached
Quickening progress saves the purpose of material, increases the safety coefficient of similar construction, reduces difficulty of construction and period.Reduction finishes
The traffic pressure that is open to traffic below structure object has good social benefit and economic benefit.
Specific embodiment
It will come that the present invention will be described in detail with specific embodiment below, and illustrative examples of the invention and illustrate to use herein
Explain the present invention, but not as a limitation of the invention.
Bracket of the invention is to customize bracket, power transmission bracket in steel construction factory.Rod iron processes screw thread and customizes corresponding rule
The nut of lattice.Fining twisted steel is cut to the length of needs and is equipped with sufficient amount nut.
Preparation of construction
(1) in steel construction factory customization bracket, (bracket of cylinder pier need to be transformed using anchor ear, be held by the way of anchor ear
Load carries, and pier shaft is not boxed out hole), power transmission bracket.Rod iron processes screw thread and customizes the nut of dimension.Fining twisted steel is cut
It cuts to the length of needs and is equipped with sufficient amount nut.
(2) pour pier shaft concrete, construct pier stud (square column pier) when with pvc pipe reserving hole, penetrate and wear when to construct
Heart rod iron.
(3) demoulding conserves, and maintenance 7 days or more.
Bracket method for construction step (1) Support bracket, power transmission bracket static test
1. the construction of Support bracket static load is tested: pre-compression test should be carried out when using for the first time.The reserving hole on testing column makes to hold in the palm
Frame is further applied load precompressed after installing on testing column.Slow precompressed step by step, prefabricating load are 1.3 times of design load, observation
Structure without deformed damaged, ensure structure safety.After verifying structure safety falsework can be set up in high-altitude.
2. power transmission bracket static test: being separated by (the 0.4+0.17*2+0.1m embedded hole center height 84cm in pier shaft bottom
Away from) distance each use up and downPreformed hole, after pier shaft concrete strength reaches design strength, stress rod iron is penetrated
In hole, installation power transmission bracket simultaneously pre-tighten, then install intelligent tensioning equipment to bracket load, load jack center away from pier shaft outside
Surface 0.27m is loaded onto 581.3*1.3=756KN, observes deformation after bracket stress.Can put into after test safety makes
With.
Support bracket, the installation of power transmission bracket
After success of the test, entity structure construction can be put into.Setting up for operating platform is carried out first, is constructed using pier stud
The safety climbing ladder left manually operation up and down.Supporting bracket frame method construction reserving hole need to be reserved on pier shaft for being inserted into rod iron
Using embedded PVC pore-forming, when pre-buried pvc pipe, need to ensure that pipeline is straight in hole.Pre-buried positioning is accurately positioned using measurement, guarantees hole location
Horizontally and vertically pier shaft side, positioning PVC Guan Shiwei, which prevents from pouring pier shaft concrete, leads to pipe deforming, need to be in pvc pipe length
Direction interval certain length adds bearing rod, and adds bilayer below pvc pipe mouth(reinforcing bar is long for steel mesh
Spend 45cm), it prevents from using pier shaft concrete pressure break at reserved aperture after rod iron stressIt manages pre-buried.
After the completion of pier stud construction, pier body formwork is removed, carries out Coping Construction after pier shaft concrete reaches design strength.
Pier shaft preformed hole is cleared up first, sundries in cleaning hole, then slings rod iron to pre- using truck crane or tower crane level
It boxes out place, human assistance penetrates in preformed hole in the method for the formula of tolling a bell.Rod iron front-rear position is adjusted after penetrating rod iron, is protected
It is identical to demonstrate,prove pier shaft two sides exposed length, in order to avoid rod iron is stretched out to one, power transmission bracket is caused to act directly on rod iron silk mouth.
Bracket installation: being inserted in biography positioning box after rod iron installation is accurate, positioning box also needs to assist using crane or tower crane
Manually installed, pier shaft face is adjacent to after being inserted in for positioning box and screwing on bolt prevents positioning box from rotating, right after the installation of two lateral brackets is in place
It wears Φ 32mm finish rolling deformed bar and then tightens two sides nut.
The installation of power transmission bracket: it is inserted in power transmission bracket after rod iron installation is accurate, power transmission bracket need to equally utilize crane or tower crane
Indirect labor's installation, bracket is adjacent to pier shaft face and gasket is added after being inserted in screws on customization big nut, and rod iron both ends need same when installation
Shi Jinhang, and pay attention to preventing rod iron from sliding back and forth, both ends bracket installs rear bolt and first uses box spanner with a lesser power
It pre-tightens.
Bailey beam installation
After Support bracket or power transmission bracket are installed, sand discharging box is installed in top surface, then lifts Bailey beam.Pier shaft two
Side respectively arranges that one group of Bailey beam, every group of Bailey beam tie up one by the every 1.5m of two rows or three rows Bailey truss according to bent cap sizeType bolt composition.When using truck crane, every group disposably lifting is in place, every if using tower crane after installation on ground is good
Group Bailey beam point three sections lifting, first lifts an intermediate section Bailey beam and is supported on bracket, then toward both ends spreading.Side Bailey beam
It is fixed temporarily using wirerope with pier shaft reinforcing bar after lifting is good, then lifts other side Bailey beam, lifted to two sides Bailey beam
One of every each drawknot of 3m at top-bottom chord after finishingTwo sides Bailey beam is coupled banding pier shaft by fining twisted steel, and is removed and faced
When fix, and every section Bailey beam internode flower window at two channel steels by the oblique connection of outside two panels Bailey beam, make two sides shellfish thunder
Beam is joined into entirety.At this time since cross fall acts on, power transmission bracket rotates a minute angle around rod iron along gradient direction,
Bolt is tightened using box spanner after stabilization, and pretightning force is subject to 1 meter of deep socket, two people and twists motionless, pays attention to rod iron both ends
It pre-tightens simultaneously.
The installation of I-steel tripod
After beret slice is installed, the installation of 6m long I20 I-steel is carried out by 50cm spacing, part conduct is respectively chosen at both ends
Operating platform.A safety rope should be drawn between pier stud exposed steel bar before the mounting, safety belt is tied up to safety by operator
The installation of I20 I-steel is carried out on rope, is not laid with I-steel in pier stud position.Since bent cap both ends are variable cross-sections, slot is used
Steel processes an English truss and carries out supertronic, and the I20 I-steel of spacing 50cm is still laid with below truss, then re-lays bottom
Mould.
Bed die installation
Bed die is made of the punching block of 6mm, is laid immediately on I20 I-steel, glass cement is smeared between plate stitch, in order to avoid leakage
Slurry.Template is processed into pier stud contour line at pier stud, closely touch pier stud, and the seam between template and pier stud also smears glass cement,
Mortar leakage prevention.After bed die is installed, template is cleaned the construction for facilitating next procedure.
Bed die is safe up and down to meet Coping Construction and construction personnel after being installed, and to install the peace up and down of Coping Construction
Full tunnel.Channel construct using safety climbing ladder, safety climbing ladder surrounding hangs up Dense mesh screen.Ladder uses simple zigzag ladder, existing
Molding is set up in field section by section, increases with the increase of pier stud construction height, first to the original place of high pier installation ladder position before installation
Face carries out leveling compacting and is hardened with 20cm thickness C20 concrete.Each pier sets up a safety climbing ladder as the upper and lower logical of construction personnel
Road, safety climbing ladder is apart from pier shaft 1.2m, the every raising 6m of safety climbing ladder, it is necessary to useSteel pipe scaffolding is connected firmly with pier shaft,
Avoid excessively high roll that overhang because of safety climbing ladder.
Ladder must carry out the protection of bent cap surrounding after being installed, weld 1.5m high at the both ends of I20 I-steelSteel pipe is as railing post, then welds two layers of horizontal steel tube, then hangs Dense mesh screen and installation skirting board is protected, be laid with steel
Muscle net and the sealing of wood walkway plate, anti-falling object from high altitude are hurted sb.'s feelings.
Points for attention
1) column steel pipe processing installation:Column steel pipe basis is constructed in strict accordance with design drawing, live feelings
Condition, which such as changes, to be reported, and allowed to construct after changing.Column penstock installation is constructed by Steel Structure Installation requirement, column
It is connected when steel pipe spreading using steel pipe butt welding, it is desirable that bevel is fully welded and along surrounding using 8 pieces of 10mm thickness 100*100mm stiffeners
Reinforce welding, it is ensured that whole stress after steel pipe post spreading；Staking out height is more than 6m, and [14 channel steel scissors are arranged every 4~6m
Support, bridging are connect with column steel pipe using gusset plate, node plate thickness 10mm.Column steel pipe top steel plate surface is welded to connect 3
Spell 32a I-steel.
2) Support bracket, the processing of power transmission bracket:
To ensure power transmission bracket, Support bracket, coarse thread round steel bar and the welding of customization big nut, processing quality, using profession
Producer's production.And groove welding procedure is strictly used to process in production.
3) Bailey beam lifting is lifted using unilateral monolithic or unilateral integral assembling mode according to live near-far situation, is dismantled,
Monolithic is fixed temporarily after lifting to pier top, is tied up after the completion of unilateral all liftings using U-bolt；The Bailey beam of every side 2 or 3
It ties up to form entirety using U-bolt, U-bolt spacing 1.5m；Two sides Bailey beam must use finish rolling deformed bar to drawing, essence
Screw-thread steel interval 3m top-bottom chord each 1 is rolled, and used at Bailey beam internode flower window [10 channel steel diagonal cross drawknots, it is ensured that
It is dead to hold hoop tightly for two sides Bailey beam and pier stud after connection.
4) Bailey beam after the installation is completed must pre-tighten again rod iron bolt, and pretightning force is as described above, it is ensured that bracket
It is adjacent to pier shaft face and stress will not rotate.
5) distribution beam is arranged in strict accordance with design drawing, and distribution beam and Bailey beam are fixed by lock, not can weld, cantilever
Hold erection construction platform in distribution beam.
6) processing of bent cap framework of steel reinforcement piece and welding use loose tool technique.
7) sequence that pours of bent cap concrete should be from centre respectively to the symmetrical placement layer by layer in both ends.
It is provided for the embodiments of the invention technical solution above to be described in detail, specific case used herein
The principle and embodiment of the embodiment of the present invention are expounded, the explanation of above embodiments is only applicable to help to understand this
The principle of inventive embodiments；At the same time, for those skilled in the art, according to an embodiment of the present invention, in specific embodiment party
There will be changes in formula and application range, in conclusion the contents of this specification are not to be construed as limiting the invention.
Claims (2)
1. a kind of great cantilever bent cap Bracket method for construction method, it is characterised in that the following steps are included:
Reserving hole is for being inserted into rod iron on pier shaft when pier stud is constructed, and preformed hole is using embedded pvc pipe pore-forming, pre-buried pvc pipe
When need to ensure that pipeline is straight；
After the completion of pier stud construction, pier body formwork is removed, carries out Coping Construction after pier shaft concrete reaches design strength, first
Pier shaft preformed hole is cleared up, then sundries in cleaning hole is sling rod iron level to preformed hole, human assistance is to toll a bell
The method of formula penetrates in preformed hole, is adjusted after penetrating rod iron to rod iron front-rear position, guarantees pier shaft two sides exposed length phase
Together, in order to avoid rod iron is stretched out to one；
Positioning box is inserted in after rod iron installation is accurate, positioning box also needs to sling cooperation human assistance installation, after positioning box is inserted in
It is adjacent to pier shaft face and screwing on bolt prevents positioning box from rotating, to wearing finish rolling deformed bar and then tighten after the installation of two lateral brackets is in place
Two sides nut；
Power transmission bracket is inserted in after rod iron installation is accurate, power transmission bracket need to equally sling cooperation human assistance installation, power transmission bracket set
It is adjacent to pier shaft face after entering and gasket is added and screws on nut, rod iron both ends need to carry out simultaneously when installation, and before and after paying attention to preventing rod iron
Sliding, both ends power transmission bracket are installed rear bolt and box spanner are first used to be pre-tightened with a lesser power.
2. great cantilever bent cap Bracket method for construction method as described in claim 1, it is characterised in that:
It is accurately positioned when pre-buried pvc pipe using measurement, guarantees hole location horizontally and vertically pier shaft side, prevented when positioning pvc pipe
Pouring pier shaft concrete leads to pipe deforming, need to add bearing rod in pvc pipe length direction interval certain length, and in pvc pipe
Mouthful lower section adds steel mesh, prevents pier shaft concrete pressure break at reserved aperture after rod iron stress.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910051141.9A CN109736202A (en) | 2019-01-18 | 2019-01-18 | Great cantilever bent cap Bracket method for construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910051141.9A CN109736202A (en) | 2019-01-18 | 2019-01-18 | Great cantilever bent cap Bracket method for construction method |
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| CN201910051141.9A Pending CN109736202A (en) | 2019-01-18 | 2019-01-18 | Great cantilever bent cap Bracket method for construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110700102A (en) * | 2019-10-12 | 2020-01-17 | 重庆建工建筑产业技术研究院有限公司 | Construction method of prestressed steel structure front-pull rear-lock cast-in-place platform |
| CN112411383A (en) * | 2020-11-11 | 2021-02-26 | 重庆城建控股(集团)有限责任公司 | Large cantilever concrete bent cap few-embedded-part assembled bracket and construction method thereof |
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Application publication date: 20190510 |