CN104929047A - V-shaped pier outer support construction method - Google Patents
V-shaped pier outer support construction method Download PDFInfo
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- CN104929047A CN104929047A CN201510311057.8A CN201510311057A CN104929047A CN 104929047 A CN104929047 A CN 104929047A CN 201510311057 A CN201510311057 A CN 201510311057A CN 104929047 A CN104929047 A CN 104929047A
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- 238000009415 formwork Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- 240000007419 Hura crepitans Species 0.000 claims description 15
- 239000002965 rope Substances 0.000 claims description 9
- 230000003014 reinforcing Effects 0.000 claims description 8
- 238000005056 compaction Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 210000000614 Ribs Anatomy 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000789 fastener Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000007569 slipcasting Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 238000005452 bending Methods 0.000 abstract 1
- UHOVQNZJYSORNB-UHFFFAOYSA-N benzene Chemical compound 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Abstract
A V-shaped pier outer support construction method comprises preparation work before construction, foundation pit refilling and processing, ground beam truss foundation construction, right-angle truss installation, pier rebar and formwork installation, fine rolling and rough twisted steel installation, V-shaped pier concrete pouring, V-shaped pier formwork and right-angle truss dismounting and other procedures. By means of the comprehensive application of two construction technologies of opposite pulling of a right-angle truss and fine rolling twisted steel, the single item construction technology is simple, and operation is easy. Compared with a traditional construction method, it is guaranteed that the integrity of a V-shaped pier is kept, no large circulation component penetrates through an inclined leg, additional bending moment cannot be produced at the bottom, and cracks cannot be produced either; the input of circulation materials is little. Meanwhile, the construction safety is guaranteed, the construction process is improved, and the construction cost is reduced.
Description
Technical field
The present invention relates to bridge construction construction technique field, specifically ephemeral stream and cross-line bridge V-type pier right angle truss outer support construction method.
Background technology
Along with the great development of economy, the traffic base such as highway, town road builds Fast Construction.Road construction to be intersected etc. by river, gully, Lu Yulu all needs to build bridge, and especially municipal bridge construction not only meets using function, considers city look of the city simultaneously.In numerous bridge pier column structural shape, V-type pier is novel in design light and handy, but during construction, because V-type pier root is thinner, has a negative impact during battered leg construction to it; And when building with V-type pier battered leg intersection girder, secondary effect can be produced to V-type pier battered leg root again.This construction method adopts V-type pier right angle truss outer support to coordinate finish rolling coarse thread steel bar symmetrical drawknot right angle truss mode, effectively solves the stressed problem of V-type pier root, and to guarantee construction safety, accelerating construction progress, reduces construction cost and have great significance.
Summary of the invention
Object of the present invention, be to provide a kind of safe and reliable, speed of application is fast, the V-type pier stud construction method of saving resource.
The technical scheme adopted is:
A kind of V-type pier outer support construction method, comprises the steps:
1, pit backfill and process
In cushion cap foundation ditch, graded gravel is backfilled, by clean for the eliminating impurities in foundation ditch before backfill after bearing platform construction.Back-filling in layers, every layer thickness is not more than 20cm, and compaction in layers rolls, and degree of compaction reaches more than 98% can fill last layer.Surfacing is carried out after being backfilling into design grade beam (truss basis) end absolute altitude.
2, grade beam (truss basis) construction
Grade beam cross dimensions is 750 × 750mm.Provide grade beam by survey crew after cushion cap pit backfill completes to design and construct position (truss is in place), after needing before concreting again to survey and establishing grade beam construction location, sandbox reserved location, truss back position errorless, carry out concreting.Correct embedment truss before concrete initial set, fixing bar built-in fitting.
3, right angle truss installa-tion
After design size segmentation blanking, the connection of square steel adopts welding, and weldquality controls by standard above grade 3.
Right angle truss installa-tion pre-test personnel provide the exact position of truss again, and place sandbox (regulate height, be convenient to dismounting), first press closely through reaction frame before sandbox uses.Multiple right angles truss is placed in respectively the desired location on sandbox.The every side of right angle truss installa-tion order in place from outside to inside or from the inside to the outside, after first installation in position, the pre-buried anchor ring adopting four points of wire rope to connect on right angle truss and grade beam fixes right angle truss; After second right angle truss installa-tion is in place, install the connecting rod between two right angle in place truss, connecting rod connects right angle truss and adopts bolt, and fixing right angle truss wire rope is not removed; Install the 3rd right angle truss, the 4th right angle truss, between third and fourth truss, connecting rod is installed and is all completed, and is once put in place fastening for connecting-rod bolt, then remove wire rope by centre to both sides.Again check truss installa-tion position, right angle, the embedded ribs on space between qualified rear C20 concreting truss and rear backrest welded truss and grade beam.
4, V pier reinforcing bar, model sheetinstallat
Lay horizontal stupefied inside right angle truss, adopt 16# channel-section steel, carry out steel form subsequently and install and reinforcing bar binding work, after completing, essence is pricked indented bars fastening, after all completing, carry out concreting work.
V-type pier construction time inside and outside V-type pier scope erection construction scaffold and up-downgoing catwalk, construction scaffolding adopt fastener type steel pipe scaffold, usage platform springboard completely spreads.
V-type pier template adopts set shaped steel formwork 1.5 meters × 1.0 meters, and between template, connected mode is with bolts, adopts M14 split bolt to connect between inner and outer template.
Pier foundation and variable cross-section adopt prefabricated abnormal formwork; Other position adopts set shaped steel formwork 1.5 meters × 1.0 meters.
Model sheetinstallat order is: 1, pier foundation model sheetinstallat; 2, right angle truss installa-tion in place after, truss is pressed design attitude back cord is installed, then V pier battered leg exterior sheathing is installed; 3, after V pier battered leg reinforcement installation completes, variable-cross-section special shaped template is installed; 4, install V pier inner formword, install inner formword back cord, split bolt M14 is fastening.
5, essence pricks coarse thread steel bar installation
Essence is pricked coarse thread steel bar and is adopted φ 32 essence to prick indented bars, and grade is PSB830.
After the installation of V-type pier inner formword by φ 32 essence prick coarse thread steel bar by design in place and apply pretension essence prick coarse thread steel bar install order carry out from the bottom to top along V pier height, five roads are installed altogether.Direction across bridge often pair right angle truss is all installed essence and is pricked coarse thread steel bar.
6, V-type pier concreting
15cm under concrete one-time-concreting to pier and beam junction, two battered legs are placement layer by layer simultaneously, adopts internal vibration rod to be aided with attached vibrator and vibrates.
7, V-type pier template, right angle truss are removed
Treat that the girder pre-stressed slip casting of upper tank completes and reach 100% dismountable V pier right angle, rear truss.First removal finish rolling coarse thread steel bar, abolish the concrete between truss and rear backrest, then removal sandbox, right angle truss and V pier battered leg spacing reach can remove exterior sheathing, back cord, finally removes right angle truss.
advantage of the present invention
The present invention is by adopting V-type pier right angle truss outer support to coordinate finish rolling coarse thread steel bar symmetrical drawknot right angle truss mode, effectively solving the stressed problem of V-type pier root, ensure the safety of construction, shorten the construction period, saved construction cost.
accompanying drawing illustrates:
Fig. 1 is construction technology process schematic diagram.
Detailed description of the invention
A kind of V-type pier outer support construction method, specifically comprises the following steps:
1, pit backfill and process
Before backfill, the foreign material (soil block, woven bag, benzene plate etc.) in foundation ditch are removed clean.Back-filling in layers graded gravel, every layer of backfill thickness≤20cm, compaction in layers rolls, and degree of compaction reaches more than 98% can fill last layer.Surfacing is noted after being backfilling into design grade beam (truss basis) end absolute altitude.
2, grade beam (truss basis) construction
Provide grade beam (cross dimensions is 750 × 750mm) position of designing and constructing (truss is in place) by survey crew after cushion cap pit backfill completes, reinforcing bar, template and concrete construction perform bridge foundation construction code requirement.Need before concreting again to survey establish grade beam construction location, sandbox reserved location, truss back position errorless after can concreting.Before concrete initial set, bar built-in fitting fixed by correct embedment truss.
3, right angle truss installa-tion
Right angle truss is entrusted has the unit of Construction of Steel Structure qualification to process.For ease of transport, scene is with good conditionsi can produce at the scene.After design size segmentation blanking, the connection of square steel adopts welding, and weldquality controls by standard above grade 3.Construct and in transportation, avoid colliding with right angle truss in order to avoid cause the damage of load-bearing rod member or cause the disadvantageous distortion of carrying etc.
Right angle truss installa-tion pre-test personnel again provide the exact position of truss and place sandbox (regulate height, be convenient to dismounting), first press closely through reaction frame before sandbox uses.25T truck crane is used to make truss be located on sandbox and and use hydraulic jack to finely tune to design attitude.The every side of right angle truss installa-tion order in place from outside to inside or from the inside to the outside, after first installation in position, adopts the pre-buried anchor ring on four points of wire rope truss frame for connectings and grade beam to fix truss; After second truss installa-tion is in place, install the connecting rod between two right angle in place truss, connecting rod truss frame for connecting adopts bolt, and fixing truss wire rope is not removed; 3rd right angle truss, the 4th right angle truss are installed, between third and fourth truss, connecting rod is installed and is all completed, by centre to both sides once by fastening for connecting-rod bolt put in place (being only that bolt is screwed half in installation process), then remove wire rope.Again check truss installa-tion position, right angle, the embedded ribs on space between qualified rear C20 concreting truss and rear backrest welded truss and grade beam.
4, pier reinforcing bar, model sheetinstallat
Lay horizontal stupefied (16# channel-section steel) inside right angle truss, carry out steel form subsequently and install and reinforcing bar binding work, after completing, essence being pricked indented bars (to drawing reinforcing bar) in place and fastening, after all completing, carrying out concreting work.
V-type pier construction time inside and outside V-type pier scope erection construction scaffold and up-downgoing catwalk, construction scaffolding adopt fastener type steel pipe scaffold, usage platform springboard completely spreads.
V-type pier pier foundation and variable cross-section adopt the abnormal formwork of customization; Other position adopts the set shaped steel formwork 1.5 meters × 1.0 meters of customization, and between template, connected mode is with bolts, adopts M14 split bolt to connect between inner and outer template.
Model sheetinstallat order is: 1, pier foundation model sheetinstallat; 2, right angle truss installa-tion in place after, truss is pressed design attitude back cord is installed, then V pier battered leg exterior sheathing is installed; 3, after V pier battered leg reinforcement installation completes, variable-cross-section special shaped template is installed; 4, install V pier inner formword, install inner formword back cord, split bolt M14 is fastening.
Pier model sheetinstallat abnormal formwork is installed by hand fit's crane, and typified form is to be manually installed as master.
5, essence pricks coarse thread steel bar installation
Essence is pricked coarse thread steel bar and is adopted φ 32 essence to prick indented bars, and grade is PSB830.
After the installation of V-type pier inner formword, φ 32 essence is pricked coarse thread steel bar in place and apply pretension by design, after prestretching, the position of the position of truss, V pier template is all in design drawing design attitude error allowed band.
The order that essence pricks coarse thread steel bar installation is carried out from the bottom to top along V pier height, installs five roads altogether.Direction across bridge often pair right angle truss is all installed essence and is pricked coarse thread steel bar.
6, V-type pier concreting
15cm under concrete employing concrete mixer one-time-concreting to pier and beam junction, two battered legs are placement layer by layer simultaneously, adopts internal vibration rod to be aided with attached vibrator and vibrates.
7, V-type pier template, right angle truss are removed
Treat that the girder pre-stressed slip casting of upper tank completes and reach 100% dismountable V pier right angle, rear truss.First removal finish rolling coarse thread steel bar, abolish the concrete between truss and rear backrest, then removal sandbox, right angle truss and V pier battered leg spacing reach can remove exterior sheathing, back cord, finally removes right angle truss.
Claims (1)
1. a V-type pier outer support construction method, is characterized in that comprising the steps:
(1) pit backfill and process
In cushion cap foundation ditch, graded gravel is backfilled, by clean for the eliminating impurities in foundation ditch before backfill after bearing platform construction; Back-filling in layers, every layer thickness is not more than 20cm, and compaction in layers rolls, and degree of compaction reaches more than 98% can fill last layer; Surfacing is carried out after being backfilling into design grade beam (truss basis) end absolute altitude;
(2) grade beam construction
Grade beam cross dimensions is 750 × 750mm; Provide grade beam by survey crew after cushion cap pit backfill completes to design and construct position, after needing before concreting again to survey and establishing grade beam construction location, sandbox reserved location, truss back position errorless, carry out concreting; Correct embedment truss before concrete initial set, fixing bar built-in fitting;
(3) right angle truss installa-tion
After design size segmentation blanking, the connection of square steel adopts welding, and weldquality controls by standard above grade 3;
Right angle truss installa-tion pre-test personnel provide the exact position of truss again, and place sandbox, first press closely through reaction frame before sandbox uses; Multiple right angles truss is placed in respectively the desired location on sandbox; The every side of right angle truss installa-tion order in place from outside to inside or from the inside to the outside, after first installation in position, the pre-buried anchor ring adopting four points of wire rope to connect on right angle truss and grade beam fixes right angle truss; After second right angle truss installa-tion is in place, install the connecting rod between two right angle in place truss, connecting rod connects right angle truss and adopts bolt, and fixing right angle truss wire rope is not removed; Install the 3rd right angle truss, the 4th right angle truss, between third and fourth truss, connecting rod is installed and is all completed, and is once put in place fastening for connecting-rod bolt, then remove wire rope by centre to both sides; Again check truss installa-tion position, right angle, the embedded ribs on space between qualified rear C20 concreting truss and rear backrest welded truss and grade beam;
(4) V pier reinforcing bar, model sheetinstallat
Lay horizontal stupefied inside right angle truss, adopt 16# channel-section steel, carry out steel form subsequently and install and reinforcing bar binding work, after completing, essence is pricked indented bars fastening, after all completing, carry out concreting work;
V-type pier construction time inside and outside V-type pier scope erection construction scaffold and up-downgoing catwalk, construction scaffolding adopt fastener type steel pipe scaffold, usage platform springboard completely spreads;
V-type pier template adopts set shaped steel formwork 1.5 meters × 1.0 meters, and between template, connected mode is with bolts, adopts M14 split bolt to connect between inner and outer template;
Pier foundation and variable cross-section adopt prefabricated abnormal formwork; Other position adopts set shaped steel formwork 1.5 meters × 1.0 meters;
Model sheetinstallat order is: 1, pier foundation model sheetinstallat; 2, right angle truss installa-tion in place after, truss is pressed design attitude back cord is installed, then V pier battered leg exterior sheathing is installed; 3, after V pier battered leg reinforcement installation completes, variable-cross-section special shaped template is installed; 4, install V pier inner formword, install inner formword back cord, split bolt M14 is fastening;
(5) essence pricks coarse thread steel bar installation
Essence is pricked coarse thread steel bar and is adopted φ 32 essence to prick indented bars, and grade is PSB830;
After the installation of V-type pier inner formword by φ 32 essence prick coarse thread steel bar by design in place and apply pretension essence prick coarse thread steel bar install order carry out from the bottom to top along V pier height, five roads are installed altogether; Direction across bridge often pair right angle truss is all installed essence and is pricked coarse thread steel bar;
(6) V-type pier concreting
15cm under concrete one-time-concreting to pier and beam junction, two battered legs are placement layer by layer simultaneously, adopts internal vibration rod to be aided with attached vibrator and vibrates;
(7) V-type pier template, right angle truss are removed
Treat that the girder pre-stressed slip casting of upper tank completes and reach 100% dismountable V pier right angle, rear truss; First removal finish rolling coarse thread steel bar, abolish the concrete between truss and rear backrest, then removal sandbox, right angle truss and V pier battered leg spacing reach can remove exterior sheathing, back cord, finally removes right angle truss.
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| CN109024286A (en) * | 2018-07-10 | 2018-12-18 | 中铁大桥局集团第工程有限公司 | A kind of cast-in-place V-type pier construction method of concrete support wall |
| CN110029559A (en) * | 2019-05-24 | 2019-07-19 | 中国十七冶集团有限公司 | A kind of gutter slding form operation method |
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