CN106835992B - A kind of arcuate structure clear-water concrete construction of cast-in-situ box-beam method - Google Patents

A kind of arcuate structure clear-water concrete construction of cast-in-situ box-beam method Download PDF

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CN106835992B
CN106835992B CN201710125037.0A CN201710125037A CN106835992B CN 106835992 B CN106835992 B CN 106835992B CN 201710125037 A CN201710125037 A CN 201710125037A CN 106835992 B CN106835992 B CN 106835992B
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box
construction
clear
cast
arcuate
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CN106835992A (en
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张立德
黄毅
胡继生
苏志韶
郑昕
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Guangzhou City No2 Municipal Engineering Co Ltd
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Guangzhou City No2 Municipal Engineering Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges

Abstract

The invention discloses a kind of arcuate structure clear-water concrete construction of cast-in-situ box-beam method, including preparation of construction, basement process, surveying setting-out sets up shore frame, is laid with bed die, side template is installed, pre-pressing bracket, reinforcement installation, arc inner wall is installed, and upper reinforcement installation, side mould is reinforced, pouring exposed concrete, it marks time and railing foundation forms is installed, mark time and railing base concrete pours, form removal.Design is scientific and reasonable for arcuate structure clear-water concrete construction of cast-in-situ box-beam method provided by the invention, construction procedure is simplified, construction period is shortened, realizes the construction of labyrinth clear-water concrete cast-in-situ box girder, construction quality is improved, economic benefit and social benefit are apparent.

Description

A kind of arcuate structure clear-water concrete construction of cast-in-situ box-beam method
Technical field
The present invention relates to the construction technology necks of cast-in-situ steel reinforced concrete abnormity structures in Urban Bridge, bridge on highway Domain more particularly to a kind of arcuate structure clear-water concrete construction of cast-in-situ box-beam method.
Background technology
With advances in technology, traditional concrete box girder construction has been applied to Longspan Bridge engineering, subway station vehicle It stands engineering, single layer and multi storied industrial factory building column, high level and high-rise building engineering etc..Its construction method be also it is with rapid changepl. never-ending changes and improvements, such as Integral Steel template construction, rigid backbone assembled plank sheathing, rubber internal model etc., but occur some in actual application Problem:
(1) steel form cost itself is higher, for special-shaped box beam, can not reuse, and when design drawing part is deposited When conflicting with each other, scene adjustment is difficult.
(2) pouring in concrete box girder belongs to concealed work, the pouring quality of concrete can not macroscopic examination, work as use When manually pouring and vibrate, it can only ensure construction quality in sense of responsibility and strict construction and management by operating personnel, Simultaneously check it is cumbersome, it is time-consuming.
(3) when there is the special-shaped box beam of variation for box beam height and width, while there was only 1m at box beam height minimum, When local clear height only has 60cm, manually removes internal model and conveniently cannot achieve.
(4) rigid backbone assembled plank sheathing and combined steel internal model widely used in construction at present, when mounted, one As need 10h or so, it is time-consuming.
(5) rigid backbone assembled plank sheathing and combined steel internal model need personnel to enter in box beam during form removal It is removed, expends time 5h or so, and need internally to dry in the process, prevent personnel's anoxia asphyxia in box beam. Therefore its form removal expends the time and cost increases.
(6) geometry of common rubber internal model is molded by rubber mandrel, and shape is not easy to control, the geometric form with design Shape difference is larger.
(7) rubber internal model needs special messenger to keep an eye in concreting process, pays attention to that air pressure is replenished in time, prevents rubber Intracapsular air pressure declines, and influences box beam concrete roof thickness, labor intensive.
(8) rubber internal model striking time is not easy to control, to avoid concrete roof from caving in, it is easy to when artificial postponement form removal Between, occur internal model with concrete binding together the phenomenon that, the general number that recycles is less, and external capsule is easy to wear, if Abrasion, just will produce bulging to influence concrete formation.
Invention content
The purpose of the present invention is to provide one kind shortening construction period, improves the arc of construction quality and economic benefit Structure clear-water concrete construction of cast-in-situ box-beam method.
In order to overcome the above-mentioned defect present invention in the prior art to adopt the following technical scheme that:
A kind of arcuate structure clear-water concrete construction of cast-in-situ box-beam method, it is characterised in that:Include the following steps
A. construction drawing is familiar in preparation of construction, carries out an acceptance inspection to material and equipment;Basement process keeps ground top horizontal It is whole, C15 concrete cushions are poured at top, then flat water ditch is excavated around and sump, surveying setting-out sets up shore frame;
B. template laying is carried out, is laid with bed die first, installs and carries out pre-pressing bracket after being laid with bed die, then carry out side form Plate is installed, last reinforcement installation;
C. it is circular hollow structure inside box beam, bellows is fixed in fixed steel bars, fixed steel bars and bottom master Muscle effectively welds, while a circle screw-thread steel can be installed along bellows, ensures that it effectively connect with other reinforcing bars;
D. inner wall bellows carries out upper reinforcement installation after installation is complete, when framework of steel reinforcement is installed, reinforcing bar and template it Between using prefabricated protective layer cushion block support, intermesh dispersed placement;Gluten carries out reinforcement installation of marking time after installation is complete;
E. Screw arbor with nut at both-ends is being worn apart from the position of the high 25-30cm in box beam bottom, is being worn apart from the top positions 25-30cm to drawing spiral shell Bar, both sides are connected integral add for the reinforcing bar of larger section of use φ 14 of radian with homonymy screw rod after having worn Screw arbor with nut at both-ends Box beam is reinforced Gu being connect with screw rod using steel pipe compared with segment for radian, while in order to reinforce template overall stability, Increase per 3m and supports together;
F. clear water mixed mud pours, and waits for removing surface laitance after the completion of box girder webs, installation is marked time and both sides guardrail basis Template, marks time and railing concrete pours from bottom to top.
It confides a technological secret to construction manager and site operation teams and groups in A;It is opened in earth's surface horizontal slope and steeper longitudinal slope Step is dug, the region poor to part basis, which is changed, fills out rubble, and rolls compacting.
Further, vertical projection line of the box beam on ground is released with total powerstation, lime is used in combination to sprinkle markings, then root The center line that box beam is made according to projection line, is equally marked with lime;It places sheeting caps and places adjustable collet, vertical rod, row It indulges to bar of sweeping the floor, will longitudinally sweep the floor bar and upright bar snapping, and the lateral bar of sweeping the floor of installation installs longitudinal horizontal rod, installs lateral water Flat bar, installs bridging, and top layer vertical, horizontal wood a tree, used in making timber for boats leveling is fixed.
Further, people's row chute sets up into ladder ladder access form, and a step is arranged in 600mm, is highly 150mm, slope Degree is less than 1:3, with the thick two-sided film coating wooden formworks of 18mm above ladder access.
Further, mould material uses film plate, end template to be more than 20cm beyond both sides side template hemline, spreading Anti-skidding batten is followed closely on good bed die, spacing 25-35cm is installed for later stage side mould;Plane setting-out is carried out to bed die, measures bottom plate End template is adjusted to designed elevation according to measurement result, detects absolute altitude again by vertically and horizontally absolute altitude.
Further, bed die carries out pre-pressing bracket after being laid with, and lifts reinforcing bar using truck crane, is started point from both ends to centre Grade load, then uses reinforcing bar to carry out precompressed by each section of design load 120%, and hollow box body and web part use entire bundle reinforcing bar Precompressed.
Further, pre-pressing bracket carries observation point arrangement:Along the longitudinal disconnected every 1/4 span setting, one observation of structure Face, the observation point on each measuring frequency section should be no less than 5, and be arranged symmetrically, and every group of observation point should be in cradle top and holder It is arranged on the corresponding position of bottom.
Further, it when upper reinforcement skeleton is installed, is supported using prefabricated protective layer cushion block between reinforcing bar and template, mutually Staggered dispersed placement;Gluten carries out reinforcement installation of marking time after installation is complete.
Further, box beam concrete perfusion uses horizontal slice, is hoisted and is poured by lower, using poker vibrator Vibrated concrete, insertion point are evenly arranged, point-by-point mobile, after the concrete initial set of lower, pour last point of concrete, by Gradually it is poured into top.
Further, after the completion of beam body concrete placings reaches design strength of mould stripping, railing and template of marking time first are removed, then tear open Bian Mo finally tears bed die open.
Design is scientific and reasonable for arcuate structure clear-water concrete construction of cast-in-situ box-beam method provided by the invention, simplifies construction Step shortens construction period, realizes the construction of labyrinth clear-water concrete cast-in-situ box girder, improves construction quality, warp Benefit of helping and social benefit are apparent.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art With obtain other attached drawings according to these attached drawings:
Fig. 1 is a kind of construction process embodiment signal of arcuate structure clear-water concrete construction of cast-in-situ box-beam method of the present invention Figure;
Fig. 2 is that the measurement of arcuate structure clear-water concrete construction of cast-in-situ box-beam method controls elevation;
Fig. 3 is the upper mould mounting structure sectional view of arcuate structure clear-water concrete construction of cast-in-situ box-beam method;
Fig. 4 is the pre-pressing bracket floor plan of arcuate structure clear-water concrete construction of cast-in-situ box-beam method;
Fig. 5 arc box beam steel bar arrangement diagrammatic cross-sections.
Specific implementation mode
Below in conjunction with attached drawing and specific embodiment, the present invention will be described in detail, herein with the schematic implementation of the present invention Example and explanation are used for explaining the present invention, but not as a limitation of the invention.
As shown in Figures 1 to 5, a kind of arcuate structure clear-water concrete construction of cast-in-situ box-beam method, includes the following steps:
(1) preparation of construction
Before arc box beam construction, construction drawing is familiar with according to the content of construction, to marching into the arena material and equipment carries out an acceptance inspection, root It determines a post according to construction requirement, and confides a technological secret to construction manager and site operation teams and groups on demand;Construction is determined in advance Priority and difficulty installs template, the emphasis that reinforcement installation and concreting are constructed as arc box beam.
(2) basement process
It first passes through hand fit's digging machine and removes holder and set up building waste in range, and carry out smooth, compacting, in earth's surface Step excavation when horizontal slope and steeper longitudinal slope, the region poor to part basis, which is changed, fills out rubble, and rolls compacting, keeps at the top of ground It is smooth, 100mm thickness C15 concrete cushions are poured at top, flat water ditch and sump are then excavated around.
(3) surveying setting-out
According to arc box beam construction drawing, using road propelling method, determine that arc box beam key controls pile No. in advance, then pass through Arc box beam plan view axis circular curve determines coordinate of mid-peg, and bottom plate is calculated according further to sectional view, the stake of the top plate left side and The coordinate of the right stake.Finally carry out setting-out on the spot at the scene, on the outside of top plate both sides respectively increase by one across longitudinal horizontal rod span, By calculating, arc box beam longitudinal horizontal rod one is 600mm across span.It is further added by the walkways setting-out 800mm wide.It is spread with lime Upper markings are made the center line of box beam further according to projection line, are equally marked with lime.
The selection principle of wherein crucial control pile No. is the beginning and end of middle stake circular curve, different circular curve intersection points.
(4) shore frame is set up
Placing 4000*100*100mm sheeting caps → placement is adjustable collet, → vertical rod → discharge longitudinally sweep the floor bar → will be indulged It laterally sweeps the floor bar → installation longitudinal horizontal rod → installation horizontal rod → installation scissors to sweep the floor bar and upright bar snapping → installation Support → top layer vertical, horizontal wood a tree, used in making timber for boats leveling is fixed.
Upright bar horizontal spacing is 600mm, and upright bar longitudinal pitch is 600mm, two layers of 100mm × 100mm flitch of main joist Spacing is 600mm, and secondary joist 100mm × 100mm flitch spacing is 250mm, the template thick two-sided film coating wooden formworks of 18mm, two Side form supports (bottom 100mm × 100mm flitches presser feet) spacing 300mm with 100mm × 100mm flitches.Bridging φ 48.3 Transverse direction 6000mm settings are continuously arranged along longeron direction together for × 3.6mm steel pipes.
People's row chute width is that 800mm sets up into ladder ladder access form, and a step is arranged in 600mm, is highly 150mm, The gradient is less than 1:3, people's row chute is laid with using anti-slip steel mesh sheet.
(5) it is laid with bed die
Mould material uses film plate, and end template is more than 20cm beyond both sides side template hemline, in the bed die completed The upper anti-skidding batten of nail, batten size length × width x thickness are the plank of 50cm × 20cm × 2cm thickness, and spacing 25-35cm is used for the later stage Side mould installation.Along box beam bottom plate boundary one wide 10cm of tailor's tack, the batten of thick 18mm, line style is consistent with box beam bottom plate both sides. Plane setting-out is carried out to bed die, bottom plate vertically and horizontally absolute altitude is measured, end template is adjusted to by designed elevation according to measurement result, again Detect absolute altitude.
(6) side template is installed
On already installed bed die, side template installation is carried out.Side template uses 18mm thickness film plates.It follows closely at template back The lumps of wood of one 2m long 10cm × 10cm, spacing 15cm mono-.One lumps of wood for reinforcing support is set per 60cm, withstands side on one side The lumps of wood at template back, is close to Template nail in joint and is connect, and other end is then followed closely on the lumps of wood being connect with shore frame.
For arc box beam top circular arc, first in top nailing template, highly exceed design structure height 10-15cm, then The radius of design drawing needs, width 10cm are followed closely out with 2mm Stainless Molding Boards in circular arc.
(7) pre-pressing bracket
Bed die carries out pre-pressing bracket after being laid with, and lifts reinforcing bar using truck crane, starts hierarchical loading from both ends to centre, so Reinforcing bar is used to carry out precompressed by each section of design load 120% afterwards, hollow box body and web part use entire bundle reinforcing bar precompressed.Holder When setting up before precompressed, the reserved height of throwing in top will calculate ground relative settlement amount, rack elasticity and non-resilient value etc..Ground is relatively heavy Drop amount is determined with being calculated after testing inspection when basement process.According to past construction experiences, rack construction is heavy to stay value in 15~20mm Left and right adjusts after preloading observation.
Holder ballast observation point is arranged:It is longitudinal every on 1/4 span setting, one measuring frequency section, each section along structure Observation point is 6, wherein box beam bottom plate 3, the bracket basis observation point 3 of corresponding projection lower section.
Unloading:It is unloaded after ballast, discharge time is symmetrically carried out at the same time with across interior first intermediate and then both sides.
(8) reinforcement installation
The reinforcing bar for installing two φ 12 of placement in box beam two bottom sides first, for box beam bottom muscle is fixedly mounted.Position steel Muscle end needs and pre-embedded steel slab electric welding connection, ensures secured.Box beam outermost stirrup installation is carried out again, such as No. 3 hoops in Fig. 5 Muscle.It can be installed according to the spacing of drawing requirement with two 12 reinforcement weldings of φ placed before stirrup bottom.Outermost Bottom main reinforcement installation, i.e. 2a, 2b, 2c, No. 2 reinforcing bars are carried out after the completion of stirrup installation.Web is carried out while the main reinforcement installation of bottom Reinforcement installation.
(9) arc inner wall is installed
Be circular hollow structure inside box beam, in order to reach arc effect, highly with angle can with box beam it is whole into Row adjustment, using the extendable bellows in part.It is not inclined in later stage casting concrete in order to ensure the mounting height of bellows Position, it is mobile, it is fixed using the reinforcing bar of 16 diameters of φ, spacing 80cm.Fixed steel bars need to effectively be welded with bottom main reinforcement. One circle screw-thread steel can be installed simultaneously along bellows, diameter 10mm ensures that it effectively connects with other reinforcing bars such as No. 8 reinforcing bars in Fig. 5 It connects.Increase longitudinal reinforcement on the outside of spiral bar, such as No. 9 reinforcing bars in Fig. 5.
(10) upper reinforcement is installed
Inner wall bellows carries out upper reinforcement installation after installation is complete, when framework of steel reinforcement is installed, between reinforcing bar and template It is supported using prefabricated protective layer cushion block, intermesh dispersed placement;Gluten carries out reinforcement installation of marking time after installation is complete.
(11) side mould is reinforced
Screw arbor with nut at both-ends is being worn apart from the position of the high 25-30cm in box beam bottom, is being worn apart from the top positions 25-30cm to drawing spiral shell Bar.Both sides are connected integral add for the reinforcing bar of larger section of use φ 14 of radian with homonymy screw rod after having worn Screw arbor with nut at both-ends Box beam is reinforced Gu being connect with screw rod using steel pipe compared with segment for radian.Simultaneously in order to reinforce template overall stability, Increase per 3m and supports together.
(12) pouring exposed concrete
Box beam concrete perfusion uses horizontal slice, is hoisted and is poured by lower, is vibrated coagulation using poker vibrator Soil, insertion point are evenly arranged, point-by-point mobile, after the concrete initial set of lower, are poured last point of concrete, are gradually poured into Top.
(13) it marks time and railing foundation forms is installed
It waits for removing surface laitance after the completion of box girder webs, installation is marked time and both sides guardrail foundation forms, ensures that concrete is protected Covering thickness.
(14) it marks time and railing base concrete pours
It marks time and railing concrete pours completion from bottom to top, vibrated in place using poker vibrator guarantee.
(15) form removal
After the completion of beam body concrete placings reaches design strength of mould stripping, railing and template of marking time first are removed, then tear side mould open, finally Tear bed die open.
The present invention is by adopting the above-described technical solution, have the advantages that:
1. due to using having malleable inner wall bellows, not only internal model can be installed according to the radian of arc box beam, The dead weight of concrete box girder can be mitigated simultaneously, construction quality is improved, meet design requirement;
2. arc box beam formwork reinforcement ensures the structure safety of concreting, while curved appearance is effectively ensured, The problems such as reducing blibbing, construction joint hanging, surface bleeding plastic crack.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.

Claims (10)

1. a kind of arcuate structure clear-water concrete construction of cast-in-situ box-beam method, it is characterised in that:Include the following steps
A. construction drawing is familiar in preparation of construction, carries out an acceptance inspection to material and equipment;Basement process keeps ground upper flat, Top pours C15 concrete cushions, then excavates flat water ditch around and sump, surveying setting-out set up shore frame;
B. template laying is carried out, is laid with bed die first, installs and carries out pre-pressing bracket after being laid with bed die, then carry out side template peace Dress, last reinforcement installation;
C. it is circular hollow structure inside box beam, bellows is fixed in fixed steel bars, and fixed steel bars have with bottom main reinforcement Effect welding, while a circle screw-thread steel can be installed along bellows, ensure that it effectively connect with other reinforcing bars;
D. inner wall bellows, which carries out upper reinforcement installation after installation is complete, makes when framework of steel reinforcement is installed between reinforcing bar and template It is supported with prefabricated protective layer cushion block, intermesh dispersed placement;Gluten carries out reinforcement installation of marking time after installation is complete;
E. Screw arbor with nut at both-ends is being worn apart from the position of the high 25-30cm in box beam bottom, Screw arbor with nut at both-ends is worn apart from the top positions 25-30cm, Both sides worn the reinforcing bar after Screw arbor with nut at both-ends for larger section of radian using φ 14 be connected with homonymy screw rod it is integral reinforce, it is right It is connect with screw rod using steel pipe compared with segment in radian and box beam is reinforced, while in order to reinforce template overall stability, per 3m Increase and supports together;
F. clear water mixed mud pours, and waits for removing surface laitance after the completion of box girder webs, and installation is marked time and both sides guardrail foundation forms, It marks time and railing concrete pours from bottom to top.
2. arcuate structure clear-water concrete construction of cast-in-situ box-beam method according to claim 1, it is characterised in that:
It confides a technological secret to construction manager and site operation teams and groups in A;Platform is excavated in earth's surface horizontal slope and steeper longitudinal slope Rank, the region poor to part basis, which is changed, fills out rubble, and rolls compacting.
3. arcuate structure clear-water concrete construction of cast-in-situ box-beam method according to claim 2, it is characterised in that:
Vertical projection line of the box beam on ground is released with total powerstation, is used in combination lime to sprinkle markings, is made further according to projection line The center line of box beam, is equally marked with lime;It places sheeting caps and places adjustable collet, vertical rod discharges longitudinal bar of sweeping the floor, To longitudinally be swept the floor bar and upright bar snapping, and the lateral bar of sweeping the floor of installation installs longitudinal horizontal rod, installs horizontal rod, installs scissors Support, top layer vertical, horizontal wood a tree, used in making timber for boats leveling are fixed.
4. arcuate structure clear-water concrete construction of cast-in-situ box-beam method according to claim 3, it is characterised in that:
People's row chute sets up into ladder ladder access form, and a step is arranged in 600mm, is highly 150mm, and the gradient is less than 1:3, ladder access The thick two-sided film coating wooden formworks of 18mm are used above.
5. arcuate structure clear-water concrete construction of cast-in-situ box-beam method according to claim 1, it is characterised in that:
Mould material uses film plate, end template to be more than 20cm beyond both sides side template hemline, followed closely on the bed die completed Anti-skidding batten, spacing 25-35cm are installed for later stage side mould;Plane setting-out is carried out to bed die, measures bottom plate vertically and horizontally absolute altitude, End template is adjusted to designed elevation according to measurement result, detects absolute altitude again.
6. arcuate structure clear-water concrete construction of cast-in-situ box-beam method according to claim 1, it is characterised in that:
Bed die carries out pre-pressing bracket after being laid with, and lifts reinforcing bar using truck crane, starts hierarchical loading from both ends to centre, then adopt Precompressed is carried out by each section of design load 120% with reinforcing bar, hollow box body and web part use entire bundle reinforcing bar precompressed.
7. arcuate structure clear-water concrete construction of cast-in-situ box-beam method according to claim 6, it is characterised in that:
Pre-pressing bracket carries observation point arrangement:Along the longitudinal every 1/4 span setting, one measuring frequency section, each measuring frequency section of structure On observation point should be no less than 5, and be arranged symmetrically, every group of observation point should on cradle top and frame bottom corresponding position cloth It sets.
8. arcuate structure clear-water concrete construction of cast-in-situ box-beam method according to claim 1, it is characterised in that:
It when upper reinforcement skeleton is installed, is supported using prefabricated protective layer cushion block between reinforcing bar and template, intermesh dispersion cloth It sets;Gluten carries out reinforcement installation of marking time after installation is complete.
9. arcuate structure clear-water concrete construction of cast-in-situ box-beam method according to claim 1, it is characterised in that:
Box beam concrete perfusion uses horizontal slice, is hoisted and is poured by lower, using poker vibrator vibrated concrete, inserts Access point is evenly arranged, point-by-point mobile, after the concrete initial set of lower, is poured last point of concrete, is gradually poured into top.
10. arcuate structure clear-water concrete construction of cast-in-situ box-beam method according to claim 1, it is characterised in that:
After the completion of beam body concrete placings reaches design strength of mould stripping, railing and template of marking time first is removed, then tear side mould open, finally tear bottom open Mould.
CN201710125037.0A 2017-03-03 2017-03-03 A kind of arcuate structure clear-water concrete construction of cast-in-situ box-beam method Active CN106835992B (en)

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