CN108843024B - Construction method for pretensioning and binding longitudinal distribution ribs of prefabricated small box girder steel reinforcement framework - Google Patents

Construction method for pretensioning and binding longitudinal distribution ribs of prefabricated small box girder steel reinforcement framework Download PDF

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CN108843024B
CN108843024B CN201810696418.9A CN201810696418A CN108843024B CN 108843024 B CN108843024 B CN 108843024B CN 201810696418 A CN201810696418 A CN 201810696418A CN 108843024 B CN108843024 B CN 108843024B
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box girder
steel
shaped
binding
longitudinal distribution
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CN108843024A (en
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韩峰
魏列江
陈纨年
曹国斌
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Gansu Shunda Road And Bridge Construction Co ltd
Gansu Road and Bridge Construction Group Co Ltd
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Gansu Shunda Road And Bridge Construction Co ltd
Gansu Road and Bridge Construction Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12Mounting of reinforcing inserts; Prestressing
    • E04G21/122Machines for joining reinforcing bars
    • E04G21/123Wire twisting tools

Abstract

The invention relates to a construction method for pretensioning and binding longitudinal distribution ribs of a prefabricated small box girder steel reinforcement framework, which comprises the following steps of ⑴ leveling a field, measuring the position of a box girder binding pedestal, ⑵ wrapping the position of a box girder binding pedestal, ⑶ manufacturing a U-shaped box girder steel reinforcement binding tire mold, ⑷ manufacturing a V-shaped pretensioning cantilever beam of the longitudinal distribution ribs of the door-shaped prefabricated small box girder steel reinforcement framework, ⑸ manufacturing a stay cable of the V-shaped pretensioning cantilever beam of the longitudinal distribution ribs of the V-shaped prefabricated small box girder steel reinforcement framework, ⑹ punching, ⑺ connecting the pretensioning cantilever beam of the longitudinal distribution ribs of the V-shaped prefabricated small box girder steel reinforcement framework with the box girder binding pedestal and the U-shaped box girder steel reinforcement binding tire mold, connecting the pretensioning cantilever beam of the longitudinal distribution ribs of the door-shaped prefabricated small box girder steel reinforcement framework with the door-shaped box girder steel reinforcement binding tire mold, ⑻ integrally hoisting the longitudinal distribution ribs of the small box girder steel reinforcement framework into the prefabricated pedestal after tensioning is finished, and pouring concrete.

Description

Construction method for pretensioning and binding longitudinal distribution ribs of prefabricated small box girder steel reinforcement framework
Technical Field
The invention relates to the field of bridge engineering construction, in particular to a construction method for pretensioning and binding longitudinal distribution ribs of a prefabricated box girder steel reinforcement framework.
Background
In the prefabricated small box girder steel reinforcement framework binding construction, the traditional construction method is as follows: the prefabricated small box girder steel bar framework adopts a numerical control bending machine to carry out steel bar blanking and processing, and utilizes a clamping fixture to carry out steel bar binding and installation and other methods. However, the traditional process has the following defects:
⑴ the binding and installation of reinforcing bars are carried out by the clamping fixture which is manually processed, and the processing precision deviates from the design drawing.
⑵ in the process of straightening the longitudinal distribution rib of the small box girder steel reinforcement framework, the longitudinal distribution rib is not straightened uniformly, more or less parts which are not straightened, the workload of the straightener is larger, the equipment is aged gradually, and the quality of the produced longitudinal distribution rib also slides down gradually.
⑶ in the binding process of the longitudinal distribution ribs of the small box girder steel rib framework, because the longitudinal distribution ribs have the quality and the space between the clamping fixture is 1m, the longitudinal distribution ribs have a lot of down-warping positions, and the steel bars are not straight.
⑷ if the position of the longitudinal distribution rib is accurate and the straightness of the reinforcing steel bar is ensured (generally, about 6 working days of personnel investment are increased), extra labor cost is increased, and unavoidable human resource waste is caused.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction method for pretensioning and binding the longitudinal distribution ribs of the prefabricated small box girder steel reinforcement framework, which has high working efficiency, cost saving and simple and practical operation.
In order to solve the problems, the construction method for pretensioning and binding the longitudinal distribution ribs of the prefabricated box girder steel reinforcement framework comprises the following steps:
⑴, leveling the site before construction, and accurately measuring the binding pedestal position of the box girder to ensure that the box girder has no deviation;
⑵ the box girder binding pedestal is edged by using a pedestal equal-edge angle steel;
⑶ manufacturing a U-shaped box beam reinforcing steel bar binding tire mold, longitudinally welding and fixing the box beam binding pedestal on a terrace at intervals of 1m, and longitudinally connecting the box beam binding pedestal by using a parallel connection;
⑷ manufacturing V-shaped and door-shaped prefabricated small box girder steel reinforcement framework longitudinal distribution rib pretension cantilever beam:
connecting the I-shaped steel I and the I-shaped steel II with the I-shaped steel III through double-side welding according to the slope of a box girder web plate to form a V-shaped component; the V-shaped component is buried in a position 100cm below the terrace;
connecting the I-shaped steel IV and the I-shaped steel V with the I-shaped steel VI through double-side welding according to the width of a top plate of the box girder to form a door-shaped member; the door-shaped component is buried in a position 100cm below the terrace;
⑸ manufacturing a V-shaped prefabricated small box girder steel reinforcement framework longitudinal distribution rib pretension cantilever beam stay cable:
manufacturing a reinforcing steel bar I into a U shape, and embedding the reinforcing steel bar I into the position 150cm below the floor and 1m horizontally away from the I-shaped steel I and the I-shaped steel II according to the positions of the I-shaped steel I and the I-shaped steel II; then, connecting the I-shaped steel I, the I-shaped steel II and the reinforcing steel bar I together by using a steel wire rope;
⑹, punching the I-shaped steel I, the I-shaped steel II and the I-shaped steel III according to the position and the size of the exposed steel bar of the small box girder;
⑺, connecting the V-shaped precast small box girder steel reinforcement framework longitudinal distribution rib pre-tensioned cantilever beam with the box girder binding pedestal and the U-shaped box girder steel reinforcement binding tire mold;
⑻ stretch-draw equipment stretch-draw little case roof beam steel reinforcement framework longitudinal distribution muscle with supporting ground tackle, and the integral hoisting is to pouring concrete in the prefabricated pedestal after the ligature is accomplished.
In the step ⑵, the side width of the equal-side angle steel of the bench is 50mm, and the side thickness is 5 mm.
In the step ⑷, the height of I-shaped steel I, II-shaped steel II, IV-shaped steel, V-shaped steel and VI-shaped steel is 400mm, the width is 144mm, the waist thickness is 12.5mm, and the leg thickness is 16.5 mm.
The height of the I-shaped steel III in the step ⑷ is 280mm, the width of the I-shaped steel III is 124mm, the waist thickness of the I-shaped steel III is 10.5mm, and the leg thickness of the I-shaped steel III is 13.7 mm.
The specification of the steel bar I in the step ⑸ is phi 28 mm.
The specification of the wire rope in the step ⑸ is phi 18 mm.
The type of the tensioning equipment in the step ⑻ is a ZY-10 type manual anchor rod tension meter.
Compared with the prior art, the invention has the following advantages:
1. effectively ensure the straightness of the longitudinal distribution ribs of the small box girder steel reinforcement framework.
The V-shaped and door-shaped cantilever beam stretched by the small box girder steel reinforcement framework is used as a stretching stress barrier, so that the stress of the longitudinally distributed steel reinforcement is effectively prevented from being loosened after the stretching is finished. The longitudinal distribution ribs are always in a tight and straight state in the binding process.
2. The defects of difficult control of reinforcement positioning and downwarping in conventional construction are overcome.
The invention purposefully controls the accuracy of the position of the longitudinal distribution rib of the small box girder steel reinforcement framework and the natural downward deflection of the steel reinforcement, so that the design position of the longitudinal distribution rib of the small box girder steel reinforcement framework and the deflection of the steel reinforcement can be better ensured during construction.
3. The tensioning system can be reused.
The tension system in the invention is composed of profile steel and tension instruments, 2 pairs of tension V-shaped and door-shaped cantilever beams can be manufactured in one project, 1 manual tension instrument can be used for segmental flow operation in construction, and the tension instruments can be reused in different projects.
4. Saving resources and saving engineering cost.
The steel bar processing in the invention adopts factory standardized flow operation, thus improving the work efficiency and reducing the resource waste of raw materials; after the longitudinal distribution ribs are tensioned, the binding and installation of the steel bar framework are carried out in the clamping fixture, the hoisting truss is integrally hoisted into the die, the investment of personnel and materials is reduced, the labor intensity is reduced, the quality is effectively guaranteed, the construction efficiency is high, and the industrialization degree is improved. Particularly, after the longitudinal distribution ribs are tensioned, extra personnel are not needed to be matched with binding operation of workers, and the labor cost is effectively reduced.
5. The invention has high working efficiency and simple and practical operation.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Figure 1 is a side view of a V-shaped tensioned cantilever beam of the present invention.
Fig. 2 is a structure view of the V-shaped tension cantilever beam of the present invention.
Figure 3 is a side view of a portal tensioned cantilever beam of the present invention.
Fig. 4 is a structural view of the door-shaped tension cantilever beam of the present invention.
FIG. 5 is a connection diagram of the V-shaped tension cantilever beam and the clamping fixture in the invention.
FIG. 6 is a connection diagram of the door-shaped tension cantilever beam and the clamping fixture in the invention.
FIG. 7 shows a U-shaped binding clamping fixture for the bottom and web of a prefabricated small box girder.
FIG. 8 shows a binding jig for a door-shaped top plate of a prefabricated small box girder.
In the figure: 1-binding a box girder pedestal; 2, equal angle steel of a pedestal; 3-I-steel III; 4-I-steel I; 4' -I-steel II; 5-reinforcing steel bar I; 6-steel wire rope; 7-I-steel IV; 7' -I-steel V; 8-I-steel VI; 9-tensioning equipment; 10, longitudinally distributing ribs on the reinforcement framework of the small box girder; 11-a U-shaped box girder reinforcing steel bar binding tire mold; 12-a floor; 13-door shape case roof beam reinforcing bar ligature child mould.
Detailed Description
As shown in fig. 1-8, the construction method for pretensioning and binding the longitudinal distribution ribs of the prefabricated box girder steel reinforcement framework comprises the following steps:
⑴ the site is leveled before construction, and the position of the box girder binding pedestal 1 is accurately measured, so that the box girder binding pedestal has no deviation.
⑵ box girder binding pedestal 1 is edged by pedestal equal angle steel 2, the side width of pedestal equal angle steel 2 is 50mm, and the side thickness is 5 mm.
⑶ the U-shaped box girder steel bar binding tire mould 11 is welded and fixed on the terrace 12 at intervals of every 1m along the longitudinal direction of the box girder binding pedestal 1 and is connected with the terrace by flat connection along the longitudinal direction.
⑷ manufacturing V-shaped and door-shaped prefabricated small box girder steel reinforcement framework longitudinal distribution rib pretension cantilever beam:
i-shaped steel I4 and I-shaped steel II 4' are connected with I-shaped steel III 3 through double-sided welding according to the slope of a box girder web plate to form a V-shaped component; the V-shaped component is buried in the place 100cm below the ground level 12.
Connecting the I-shaped steel IV 7 and the I-shaped steel V7' with the I-shaped steel VI 8 through double-side welding according to the width of a box girder top plate to form a door-shaped member; the door-shaped member is buried in the place 100cm below the floor 12.
The height of the I-shaped steel I4, the I-shaped steel II 4 ', the I-shaped steel IV 7, the I-shaped steel V7' and the I-shaped steel VI 8 is 400mm, the width is 144mm, the waist thickness is 12.5mm, and the leg thickness is 16.5 mm.
The height of the I-shaped steel III 3 is 280mm, the width of the I-shaped steel III is 124mm, the waist thickness of the I-shaped steel is 10.5mm, and the leg thickness of the I-shaped steel is 13.7 mm.
⑸ manufacturing a V-shaped prefabricated small box girder steel reinforcement framework longitudinal distribution rib pretension cantilever beam stay cable:
the reinforcing steel bar I5 is made into a U shape, and the reinforcing steel bar I5 with the specification of phi 28 mm is embedded into the ground below 12 cm by 150cm according to the positions of the I-shaped steel I4 and the I-shaped steel II 4 ', and the horizontal distance between the I-shaped steel I4 and the I-shaped steel II 4' is 1 m; and then connecting I-shaped steel I4, I-shaped steel II 4' and reinforcing steel I5 together by using a steel wire rope 6 with the specification of phi 18 mm.
⑹ the I-beam I4, the I-beam II 4 'and the I-beam III 3 are punched according to the position and the size of the exposed steel bar of the small box girder, and the I-beam IV 7, the I-beam V7' and the I-beam VI 8 are punched according to the position and the size of the exposed steel bar of the small box girder.
⑺ the V-shaped precast small box girder steel reinforcement framework longitudinal distribution rib pretension cantilever beam is connected with the box girder binding pedestal 1 and the U-shaped box girder steel reinforcement binding tire mold 11, and the door-shaped precast small box girder steel reinforcement framework longitudinal distribution rib pretension cantilever beam is connected with the door-shaped box girder steel reinforcement binding tire mold 13.
⑻ tensioning equipment 9 is used for tensioning the longitudinal distribution ribs 10 of the small box girder steel reinforcement framework by using matched anchors, and after binding is completed, the small box girder steel reinforcement framework is integrally hoisted to the interior of the prefabricated pedestal for pouring concrete.
Wherein: the type of the tensioning device 9 is a ZY-10 manual anchor rod tension meter.
The tension system in the invention is composed of profile steel and tension instruments, 2 pairs of tension V-shaped and door-shaped cantilever beams can be manufactured in one project, and 1 manual tension instrument can be used for sectional flow operation in construction.

Claims (7)

1. The construction method for pretensioning and binding the longitudinal distribution ribs of the prefabricated box girder steel reinforcement framework comprises the following steps:
⑴, leveling the site before construction, and accurately measuring the position of the box girder binding pedestal (1) to ensure that the box girder binding pedestal has no deviation;
⑵ the box girder binding pedestal (1) is edged by pedestal equal angle steel (2);
⑶ manufacturing a U-shaped box girder reinforcing steel bar binding tire mould (11), welding and fixing the box girder binding pedestal (1) on the terrace (12) at intervals of every 1m in the longitudinal direction, and connecting the box girder binding pedestal and the terrace in a parallel connection manner in the longitudinal direction;
⑷ manufacturing V-shaped and door-shaped prefabricated small box girder steel reinforcement framework longitudinal distribution rib pretension cantilever beam:
i-shaped steel I (4) and I-shaped steel II (4') are connected with I-shaped steel III (3) through double-side welding according to the slope of a box girder web plate to form a V-shaped component; the V-shaped component is buried in the position 100cm below the terrace (12);
connecting an I-steel IV (7) and an I-steel V (7') with an I-steel VI (8) through double-side welding according to the width of a box girder top plate to form a door-shaped member; the door-shaped component is buried in the position 100cm below the terrace (12);
⑸ manufacturing a V-shaped prefabricated small box girder steel reinforcement framework longitudinal distribution rib pretension cantilever beam stay cable:
manufacturing a reinforcing steel bar I (5) into a U shape, burying the reinforcing steel bar I (5) below the floor (12) by 150cm according to the positions of the I-shaped steel I (4) and the I-shaped steel II (4 '), and keeping the horizontal distance between the reinforcing steel bar I (5) and the I-shaped steel II (4') to be 1 m; then, connecting the I-shaped steel I (4), the I-shaped steel II (4') and the reinforcing steel bar I (5) together by using a steel wire rope (6);
⑹, punching the I-shaped steel I (4), the I-shaped steel II (4 ') and the I-shaped steel III (3) according to the position and the size of the exposed steel bar of the small box girder, and punching the I-shaped steel IV (7), the I-shaped steel V (7') and the I-shaped steel VI (8) according to the position and the size of the exposed steel bar of the small box girder;
⑺, connecting the V-shaped precast small box girder steel bar framework longitudinal distribution rib pre-tensioned cantilever beam with the box girder binding pedestal (1) and the U-shaped box girder steel bar binding tire mold (11);
⑻ stretching equipment (9) stretches the longitudinal distribution ribs (10) of the small box girder steel reinforcement framework by using matched anchors, and after binding is finished, the small box girder steel reinforcement framework is integrally hoisted to the interior of the prefabricated pedestal for pouring concrete.
2. The construction method for pretensioning and binding the longitudinal distribution ribs of the precast small box girder steel reinforcement framework according to claim 1, characterized in that the side width of the seat equal-side angle steel (2) in the step ⑵ is 50mm, and the side thickness is 5 mm.
3. The construction method for pretensioning and binding the longitudinal distribution ribs of the precast small box girder steel reinforcement framework according to claim 1, characterized in that in the step ⑷, the height of I-shaped steel I (4), I-shaped steel II (4 '), I-shaped steel IV (7), I-shaped steel V (7') and I-shaped steel VI (8) is 400mm, the width is 144mm, the waist thickness is 12.5mm, and the leg thickness is 16.5 mm.
4. The construction method for pretensioning and binding the longitudinal distribution ribs of the precast small box girder steel reinforcement framework according to claim 1, characterized in that the height of the I-shaped steel III (3) in the step ⑷ is 280mm, the width is 124mm, the waist thickness is 10.5mm, and the leg thickness is 13.7 mm.
5. The construction method for pretensioning and binding the longitudinal distribution ribs of the precast trabecular steel reinforcement framework as recited in claim 1, wherein the specification of the steel reinforcement I (5) in the step ⑸ is phi 28 mm.
6. The construction method for pretensioning and binding the longitudinal distribution ribs of the precast box girder steel reinforcement framework according to claim 1, characterized in that the specification of the wire rope (6) in the step ⑸ is phi 18 mm.
7. The construction method for pretensioning and binding the longitudinal distribution ribs of the precast small box girder steel reinforcement framework according to claim 1, characterized in that the type of the tensioning equipment (9) in the step ⑻ is ZY-10 type manual anchor rod tension meter.
CN201810696418.9A 2018-06-29 2018-06-29 Construction method for pretensioning and binding longitudinal distribution ribs of prefabricated small box girder steel reinforcement framework Active CN108843024B (en)

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CN111877768B (en) * 2020-07-15 2021-10-26 理工华汇(潍坊)智能机器人有限公司 Automatic steel bar binding equipment and binding method
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CN105171914A (en) * 2015-08-27 2015-12-23 江苏省交通工程集团有限公司 Precast box girder steel bar binding mould and mounting method thereof
CN105365042B (en) * 2015-09-25 2017-07-04 佛山路桥预制构件有限公司 A kind of preparation method of prefabricated small box girder
CN105345926B (en) * 2015-09-25 2017-10-24 安徽水利开发股份有限公司 The precast construction method of prestressed concrete box girder
CN206306252U (en) * 2016-12-07 2017-07-07 中铁一局集团有限公司 A kind of prefabricated small box girder reinforcing bar colligation moulding bed
CN106592426B (en) * 2017-01-17 2018-04-06 安徽省交通建设股份有限公司 The construction method of transverse prestress overall with reinforced concrete bridge deck plate prefab-form system
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