CN108004925B - Prestress reinforced concrete circular arch tower construction method - Google Patents
Prestress reinforced concrete circular arch tower construction method Download PDFInfo
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- CN108004925B CN108004925B CN201711231142.9A CN201711231142A CN108004925B CN 108004925 B CN108004925 B CN 108004925B CN 201711231142 A CN201711231142 A CN 201711231142A CN 108004925 B CN108004925 B CN 108004925B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses prestress reinforced concrete circular arch tower construction methods, it includes surveying and locating；Support Design and production；Design, the production of template；Built-in fitting is embedded；Bracket, column and the installation of connection system；The production of sand cylinder, installation；Stringer, horizontal frame and the installation of connection system；King-tower pre-pressing bracket；Template installation；Concrete cast in situs, maintenance；Presstressed reinforcing steel blanking and lashing；Tension of prestressed tendon；Pumping of prostressed duct construction；Support removing.The present invention is by using steel pipe column+framed bent support system structure, construction for prestress reinforced concrete circular arch tower of constructing, the construction period is greatly shortened, reduces labor intensity of workers and difficulty of construction, the harmony of stress variation in effective guarantee domes construction, ensure the operation security in bridge construction and later period, with apparent overall economic efficiency and social benefit, there is extensive application value and reference to similar bridge structure construction.
Description
Technical field
The invention belongs to technical field of building construction, and in particular to a kind of prestress reinforced concrete circular arch tower construction party
Method.
Background technique
According to the data grasped at present, prestressed reinforced concrete bridge tower tower with A type, inverted Y-shaped, H-type, brilliant and
Based on only Deethanizer design, corresponding construction technology technology is more mature, is generally continuously constructed using overmolded section construction and sliding formwork, and pre-
The round arch tower tower type design of stress reinforced concrete circular arch tower bridge is national the first at present, does not also find correlation temporarily external
Design and construction method record.Cycloidal arch Deethanizer design is handsome in appearance, reasonable stress, but technology is complicated, process is more, technology matter
Amount requires height, and difficulty of construction is larger, with reference to traditional Arch Bridge Construction method, mainly there is Support Method and two kinds of no rack technique.Bracket
Method sets up full hall steel pipe support until vault since ground, then carries out formwork, pour, conserve etc. to construct, this method is most
Big advantage is not need Large-scale Hoisting equipment, the disadvantage is that working rack template consumption is big, the construction period is long, investment
Manpower is more, steel pipe support is set up more demanding to foundation bearing capacity, and conventional full framing steel tube member bar itself carries
Ability is limited, and security risk is larger, and it is more to pour segmentation, piecemeal for large volume concrete structural, arranges to pouring quality control
It is high to apply requirement, has significant limitation to Bridges in Mountainous Areas and the construction of high pier stud；No rack technique mainly has erection with cableway, swivel to apply
Engineering method and extension cast-in-place cantilever method, no rack technique are mainly used for weak ground, pier stud height, bracket and set up difficult mountainous region mound forest land area
Bridge superstructure construction, main construction characteristic are prefabricated be segmented using facilities such as pylon, cable, anchor ear or steering structures
Installation, the hanging operation time is long, and security risk is larger, is segmented Beam Elevation error when both ends are closed up in assembly section by section and easily exceeds
Critical field, totally unfavorable for structure stress, it is big that quality controls difficulty.Successful implementation of the invention, has been filled up including China
Blank in terms of prestress reinforced concrete circular arch tower construction technology has larger in landscape bridge construction from now on
Actual promotional value has a extensive future.
Summary of the invention
For the above-mentioned problems in the prior art, the purpose of the present invention is to provide a kind of prestressed reinforced concretes
Round arch tower construction method.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that including surveying and locating；Branch is set up
Meter and production；Design, the production of template；Built-in fitting is embedded；Bracket, column and the installation of connection system；The production of sand cylinder, installation；Stringer,
Horizontal frame and the installation of connection system；King-tower pre-pressing bracket；Template installation；Concrete cast in situs, maintenance；Presstressed reinforcing steel blanking with
Lashing；Tension of prestressed tendon；Pumping of prostressed duct construction；Support removing.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that specifically comprise the following steps:
1) surveying and locating: construction control network is first established, and to construction thin portion structure and geometric dimension, inclination angle, line style etc.
Precision positioning carries out elevation setting-out with precision level levelling method；
2) support Design, production: bracket includes king-tower bracket and people's row bracket, and king-tower bracket includes that king-tower bracket is pre-buried
Part, the first steel pipe post, third steel pipe post, intercolumniation connection system, stringer, sand cylinder, framed bent and template system, framed bent include framed bent
A, framed bent B, framed bent C；King-tower side face is equipped with people's row bracket, and people's row bracket includes people's row bracket built-in fitting on girder, the
Two steel pipe posts, platform connection system, bracket and job platform；
3) design, the production of template: template uses steel form, is thickeied by muscle in length and breadth and guarantees template compression strength, template
Assembly is connected by screw bolts；
4) built-in fitting is embedded: built-in fitting includes king-tower bracket built-in fitting and people's row bracket built-in fitting, king-tower bracket built-in fitting
To reserve bolt arrangement, people's row bracket built-in fitting is welding structure built-in fitting, installation of embedded parts process flow are as follows: combining main body knot
Structure unwrapping wire → capturing position is buried embedded part → inspection adjustment → binding and fixing；
5) bracket, steel pipe post and the installation of connection system: bracket installation steps: bracket processing → elevation location measurement → pre-buried
Part is pre-buried → bracket installation；Review is pre- before first the second steel pipe post of steel pipe post, platform connection system and the installation of intercolumniation connection system
Steel plain position and elevation are buried, and releases steel pipe post stake position center, the second steel pipe post and pre-embedded steel slab use angle
Weld seam welding, all steel pipe post center lines are along bridge Xiang Pinghang；
6) production of sand cylinder, installation: sand cylinder is welded on the column cap at the top of the first steel pipe post by billet, on sand cylinder
Drift sand hole is set to the upward position 2~3cm in sand cylinder bottom, convenient for operating, veneer welded nut on the outside of drift sand hole；The installation of sand cylinder need to be into
The row measurement of higher degree, the main practical elevation for measuring sand cylinder rest area epimerite steel pipe stake top, so that it is determined that the practical height of each sand cylinder
Journey, and the sedimentation of reserved 3~5mm；
7) stringer, framed bent, the installation of framed bent connection system: stringer is 3 I-beams (2H488 × 300), is welded into before lifting whole
Body is directly lifted by tower crane, and stringer is attached with sand cylinder by weld seam, and framed bent is welded into bent structure by fashioned iron, together
It is integral using the welding of connection system between Pin framed bent, directly hang peace；Framed bent A and third steel pipe post are copied tightly with transverse distribution beam,
The bottom end framed bent B is supported on third steel pipe post, and apical support copy with steel plate tight on framed bent C；
8) king-tower pre-pressing bracket: professional jumbo bag sand loading is hung with crane, precompressed is carried out to bracket, be pressed in bracket in advance and set up
It at later hierarchical loading, after loading settlement stability, is unloaded, unloading while continues to observe；
9) template is installed: template uses punching block, and punching block is attached by bolt, and punching block main rib is supported directly on framed bent
On, the core model of king-tower is welded and fixed using steel pipe with side form, and carries out aperture in side form, to vibrate to concrete；
10) reinforcing bar production, installation: reinforcing bar in processing workshop blanking, bend molding, finished product number pile, then have bad luck to
Scene is by design drawing setting-out, binding installation；
11) concrete cast in situs, maintenance: five sections of round arch tower king-post point pours completion three times, and concrete takes layering
It pours, tunneling boring continuous placing, concreting starts sprinkling maintenance after finishing final set, and curing time is not less than 7 days；
12) presstressed reinforcing steel blanking and lashing: round arch tower king-tower uses longitudinal prestressing system, the positioning of prestressing force bellows
Reinforcing bar is laid by 30cm, and ground or trestle face blanking of the presstressed reinforcing steel steel strand wires in smooth hardening, finished product beam go to beam by loop wheel machine
Face installation, longitudinal prestressing muscle steel stranded wire penetrating adapter carry out after being arranged in each layer reinforcing bar binding, and steel strand wires check mark penetrates pre- answer
In power bellows, front end setting guiding device is being poured, using tower crane lifting, hand fit's hoist engine from one end to the other end one
Secondary lashing；
13) tension of prestressed tendon: in segment, concrete strength reaches 90% or more, and reaches the elasticity modulus of respective strengths,
The age of concrete can carry out after being no less than 7 days.It is longitudinal to answer concrete steel twisted wire in advance using both ends while carrying out tensioning, presstressed reinforcing steel
It draws and double-direction control is carried out with stretching force and stretch value；
14) pumping of prostressed duct is constructed: after the completion of tension of prestressed tendon, presstressed reinforcing steel duct mud jacking is carried out in 48h；
15) it support removing: removes operation and segmentation, discrete faces is taken to remove, since top layer, successively carry out downwards, each layer
Connector is removed again when must tear this layer open.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that the king-tower bracket tool in step 2
Body structure are as follows: king-tower bracket built-in fitting is set in girder top surface, the first steel of 630 × 12mm of Φ is connected on king-tower bracket built-in fitting
Tube column and third steel pipe post, the first steel pipe post and third steel pipe post connect system's connection by intercolumniation, and intercolumniation connection system adopts
With 2, [20a channel steel is attached by flange, setting column cap at the top of the first steel pipe post, connects sand by backing plate on column cap
Cylinder, 3 I-beams (2H488 × 300) is put on sand cylinder as stringer, and laterally main bearing carrier is fashioned iron framed bent, framed bent A with
Third steel pipe post is copied tightly with transverse distribution beam, and the bottom end framed bent B is supported on third steel pipe post, apical support on framed bent C,
Copy with steel plate tight；Template system is placed on framed bent.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that people's row bracket packet in step 2
The second steel pipe post that girder is set by people's row bracket built-in fitting is included, the second steel pipe post and third steel pipe post are by platform
The connection of connection system, the second steel pipe post are equipped with one group of bracket, and job platform and aisle are located at bracket upper surface；Second steel pipe is vertical
Column uses 400 × 8mm of Φ steel pipe column, and platform connection system and bracket are all made of 2 [20a channel steels.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that the mounting process of king-tower bracket is such as
Under: king-tower bracket built-in fitting, which stays, to be set → hangs peace the first steel pipe post, the second steel pipe post → installation intercolumniation connection be → and hang peace sand
Cylinder → stringer installation → truss erection → framed bent connection is installation → template system installation；The mounting process of people's row bracket is as follows:
People's row bracket built-in fitting, which stays to set → mounting bracket → and hang the second steel pipe post of peace → mounting platform connection be →, hangs peace job platform
And it is fixed.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that the stream in sand cylinder in step 6)
Sand is fine sand, and clay content is not more than 2%, and water content is not more than 1%, the sedimentation of reserved 3~5mm, each sand cylinder when sand cylinder is installed
Precompressed, precompression 200t are carried out with press machine.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that the king-tower outer steel mould in step 8)
When aperture, hole is arranged as direction across bridge 50cm mono-, along bridge to 100cm mono-.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that the king-tower bracket in step 9) is pre-
Pressure uses prefabricating load to carry out precompressed to bracket for the 120% professional jumbo bag sand loading that king-tower is self-possessed, and precompressed time-division three-level loads,
King-tower order of placement is consistent with pouring order of concrete when load, and first time loaded weight is the 50% of king-tower self weight, holds lotus and stablizes
It carries out loading for second afterwards, loaded weight is the 50% of king-tower self weight, holds after lotus is stablized and carries out third time load, loaded weight is
The 20% of king-tower self weight, precompressed range are king-tower width range.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that the round arch tower in step 11)
King-post points five sections pour three times in five sections of fingers king-post two sides concrete be respectively divided into and first pour section and reserved after-pouring section, centre
For tower top closure segment, first the concrete in section and reserved after-pouring section that first pours of king-post two sides is symmetrically poured, then carries out tower
Top closure segment pours, and is divided into and pours completion three times, and concrete takes placement layer by layer, and every layer is 45-55cm, hourly to pour height
Degree is 0.8-1.2m.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that the presstressed reinforcing steel in step 13)
Tensioning, it is longitudinal to answer concrete steel twisted wire in advance using both ends while carrying out tensioning, stressing sequence are as follows: 0 → 20% σ of σ k → 40% σ of k → 100% k
→ hold lotus 5min → oil return anchors → and measure amount of recovery and the exposed amount of intermediate plate.
By using above-mentioned technology, compared with prior art, beneficial effects of the present invention are as follows:
The present invention is directed to round arch tower upper king-post strut structure design characteristic, using steel pipe column+framed bent support system structure, uses
In the construction of construction prestress reinforced concrete circular arch tower, and king-tower bracket and operating platform Specialty Design are carried out, bracket is existing
Field sets up that the time is short, and sectional is integrally installed using lifting equipment, and mechanical equipment effective rate of utilization is high, and construction work is greatly shortened
Phase reduces labor intensity of workers, it is required it is artificial it is less, facilitate construction, guarantee safety and quality, reduced to greatest extent to peripheral ring
The influence in border is most advantageous, has apparent overall economic efficiency and social benefit；Upper king-post strut concreting segmentation is few, reduces
Cast in situs number, reduces difficulty of construction, and the harmony of stress variation, satisfaction are set in effective guarantee domes construction
Count technical requirements and structure installation quality, it is ensured that the operation security of bridge construction and later period, while work has been saved to greatest extent
Journey construction land tenure reduces the destruction to river shoal geologic structure and vegetation, protects ecological environment, applies to similar bridge structure
Tool has extensive application value and reference.
Detailed description of the invention
Fig. 1 is main construction process figure of the invention；
Fig. 2 is bracket the schematic diagram of the section structure of the invention；
Fig. 3 is the A-A section enlarged structure schematic diagram in Fig. 1；
Fig. 4 is the B-B section enlarged structure schematic diagram in Fig. 1；
Fig. 5 is the C-C section enlarged structure schematic diagram in Fig. 1.
In figure: 1- people's row bracket, 101- people's row bracket built-in fitting, the second steel pipe post of 102-, 103- bracket, 104- operation
Platform, 105- platform connection system, 2- framed bent A, 3- transverse distribution beam, 4- framed bent B, 5- sand cylinder, 6- stringer, 7- arch king-tower, 8-
The first steel pipe post of framed bent C, 9-, 10- intercolumniation connection system, 11- girder, 12- king-tower bracket built-in fitting, 13- third steel pipe post,
14- epimerite steel pipe stake top, 15- backing plate.
Specific embodiment
Below in conjunction with Figure of description, the invention will be further described, but protection scope of the present invention is not limited in
This:
As shown in Figs 1-4, prestress reinforced concrete circular arch tower construction method of the invention, including surveying and locating；Branch
Set up meter and production；Design, the production of template；Built-in fitting is embedded；Bracket, column and the installation of connection system；The production of sand cylinder, installation；
Stringer, horizontal frame and the installation of connection system, specifically comprise the following steps:
1) surveying and locating: the foundation of construction control network, the encryption of repetition measurement and Construction control site including main control net are applied
Work thin portion structure and geometric dimension, the precision positionings such as inclination angle, line style, before construction, check 7 axis line position of arch king-tower,
Plane and vertical control point and related survey data, and carry out benefit survey, reinforce, construction lofting controls total station three with high precision
It ties up based on coordinate method, it is a variety of to measure the means that control methods combine to guarantee the accurate positioning of works plan-position, with essence
Close level levelling method carries out elevation setting-out；
2) support Design, production: the present invention is by studying main arch shape king-tower 7, to guarantee that king-tower supporting structure is steady
It is qualitative, it is constructed using steel pipe column+framed bent construction method, bracket includes king-tower bracket and people's row bracket 1, king-tower bracket
It is 10, stringer 6, sand cylinder 5, row including king-tower bracket built-in fitting 12, the first steel pipe post 9, third steel pipe post 13, intercolumniation connection
Frame and template system, framed bent include framed bent A2, framed bent B4, framed bent C8, and stringer 6 is 2H488 × 300, the first steel pipe post 9, the
Three steel pipe posts 13 use 630 × 12mm of Φ steel pipe, steel pipe connection system using 2 [20a is attached between steel pipe by flange,
Framed bent A 2, framed bent B 4, framed bent C 8 are manufactured by fashioned iron, mainly use HN200 × 100 and the fashioned iron of HW200 × 100, fashioned iron
Between using welding by the way of connect, single section framed bent A 2 by 4 monolithics by connect system be connected as a Pin, framed bent B4, framed bent
C 8 is connected as a Pin by connecting system by 10 monolithics respectively；In order to facilitate construction period template installation exercise, the present invention is in king-tower
Side face is equipped with people's row bracket 1, also referred to as operating platform, and people's row bracket 1 includes people's row bracket built-in fitting 101 on girder, the
Two 400 × 8mm of steel pipe post 102(Φ), platform connection be 105, bracket 103 and job platform 104, platform connection is 105 Hes
Bracket 103 is all made of 2, and [aisle is arranged in the channel steel of 20a, bracket 103 above, forms job platform 104 and upper and lower aisle；
The mounting process of king-tower bracket is as follows: king-tower bracket built-in fitting 12, which stays, sets → hangs peace the first steel pipe post 9, the second steel
Tube column 102 → installation intercolumniation connection be 10 → hang peace 5 → stringer of sand cylinder, 6 installations → truss erection → framed bent connection system installation →
Template system installation；The mounting process of people's row bracket 1 is as follows: people's row bracket built-in fitting 101, which stays, to be set → mounting bracket 103 → and hangs peace
The connection of second 102 → mounting platform of steel pipe post is 105 → hang peace job platform 104 and fixed.
3) design, the production of template: the stay in place form of arch king-tower 7 uses 5mm steel plate using customization steel form, steel form
Production is thickeied by muscle in length and breadth and guarantees template compression strength, and template assembly is connected by screw bolts, and connecting hole is away from, nose end away from phase
To fixation；
4) built-in fitting is embedded: built-in fitting includes king-tower bracket built-in fitting 12 and people's row bracket built-in fitting 101, and king-tower bracket is pre-
Embedded part 12 is reserved bolt arrangement, is arranged on girder 11, and people's row bracket built-in fitting 101 is welding structure built-in fitting, is welded on
The side of girder 11, installation of embedded parts process flow are as follows: combining main body structure unwrapping wire → capturing position is buried embedded part → inspection tune
Whole → binding and fixing, installation of embedded parts maximum allowable offset are ± 20mm；
5) bracket, steel pipe post and the installation of connection system: bracket installation steps: bracket processing → elevation location measurement → pre-buried
Part is pre-buried → and bracket 103 installs；First steel pipe post, 9 second steel pipe post 102, platform connection be 105 and intercolumniation connection be 10
Review pre-embedded steel slab plan-position and elevation before installation, and release steel pipe post stake position center, the second steel pipe post 102 with
Pre-embedded steel slab uses fillet weld seam, and welding angle height is 10mm, and all steel pipe post center lines are stood after suitable bridge Xiang Pinghang, pile
Column verticality should meet no more than 10mm, and column top mark height and the design high deviation of top mark are less than 3mm, and steel pipe post stake position center is inclined
Difference is not more than 5mm；
6) production of sand cylinder, installation: sand cylinder 5 is welded on the column cap at 9 top of the first steel pipe post by billet, sand cylinder 5
On drift sand hole be set to the upward position 2~3cm in sand cylinder bottom, convenient for operation, veneer welded nut on the outside of drift sand hole, while mating
Use screw rod of corresponding size；Sand cylinder is using the fine sand after sieving, and good fluidity, clay content is not more than 2%, and does to sand
Dry processing, so that water content is not more than 1%, the installation of sand cylinder 5 need to carry out the measurement of higher degree, main to measure sand cylinder rest area epimerite steel pipe
The practical elevation of stake top 14, so that it is determined that the practical elevation of each sand cylinder, and the sedimentation of reserved 3~5mm；5 Design of Bearing Capacity of sand cylinder
Value is 200t, and to eliminate the sedimentation in 5 use process of sand cylinder, the present invention can carry out precompressed with press machine to each sand cylinder 5, pre-
Pressure is 200t, measures sand cylinder height after the decrement of sand is stablized after being pre-stressed to precompression, is such as higher by design value, illustrates that sand is more
It needs to reduce sand amount in sand cylinder to press again；
7) stringer, framed bent, the installation of framed bent connection system: stringer 6 is 3 I-beams (2H488 × 300), is welded into before lifting
It is whole, it is directly lifted by tower crane, stringer 6 is attached with sand cylinder 5 by the weld seam of 6mm, and framed bent of the invention is as bracket
Main spandrel girder exist, framed bent is welded into bent structure by fashioned iron, integral with being welded between Pin framed bent using connection system,
Peace is directly hung also to be welded into framed bent by framed bent connection system；Framed bent A2 and third steel pipe post 13 are copied tightly with transverse distribution beam 3, row
The bottom end frame B4 is supported on third steel pipe post 13, apical support on framed bent C8, due on framed bent B4 there are greater level power,
Framed bent C8 partial component need to be reinforced, copy tightly with steel plate between framed bent B4 and framed bent C8, horizontal force is passed directly to
On framed bent C8；
8) king-tower pre-pressing bracket: precompressed is carried out to king-tower bracket with professional jumbo bag sand loading, prefabricating load is king-tower self weight
120%, precompressed range be king-tower width range, hang jumbo bag with crane and precompressed carried out to bracket, be pressed in advance bracket set up complete with
After carry out, a point three-level loads, and first time loaded weight is the 50% of king-tower self weight, hold and carry out second after lotus is stablized and load, load
Weight is the 50% of king-tower self weight, holds and carries out third time load after lotus is stablized, and loaded weight is the 20% of king-tower self weight, master when load
Tower order of placement is consistent with pouring order of concrete；King-tower observation position be located at often across L/2, at L/4, every row's steel pipe post point
The point of left, center, right three.The fixed observer bar at point, in order to settlement observation.Settlement observation is carried out using level, is laid
After observing bar well, its bar top mark height is determined before load, after loading for the first time, every 2 hours observation is primary, observes twice in succession
Settling amount is no more than 3mm, and when settling amount is zero, carries out second and loads, press this step, up to third time loaded.The
After loading settlement stability three times, unloaded, unloading is uniformly unloaded using hand fit's crane handling sand pocket, while unloading after
Continuous observation, has recorded observation after the completion of unloading；
9) template uses punching block, and punching block is attached by bolt, and punching block main rib is supported directly on framed bent, Construction of Pylon
When elder generation mounting and adjusting bed die, outer side mold, core model, then interior side form and backform are installed, the core model of king-tower is welded using steel pipe and side form
It is fixed, and aperture is carried out in side form, to vibrate to concrete；Side form carries out aperture, is arranged as direction across bridge 50cm mono-, along bridge
To 100cm mono-, guarantee construction operation platform, to vibrate to concrete；
10) reinforcing bar production, installation: reinforcing bar in processing workshop blanking, bend molding, finished product number pile, then have bad luck to
Scene carries out binding installation, and scene is lifted in box beam using truck crane or tower crane indirect labor, then is bound by design drawing setting-out,
King-tower bottom, web reinforcement presstressed reinforcing steel are first installed when construction, then roof steel bar is installed；
11) concrete cast in situs, maintenance: five sections of round arch tower king-post point pours completion, five sections of finger king-post two sides three times
Concrete is respectively divided into and first pours section and reserved after-pouring section, and centre is tower top closure segment, first first pours section to king-post two sides
It is symmetrically poured with the concrete in reserved after-pouring section, then carries out tower top closure segment and pour, be divided into and pour completion three times, tower top closes
Hold together that section pours the time and first to pour section time interval be 5 days for two sides, concrete takes placement layer by layer, and every layer is 45-55cm, preferably
For 50cm, tunneling boring continuous placing, the height hourly that pours is 0.8-1.2m, and preferably 1m, concrete vibrating is using insertion
Formula vibrator, depth of vibrating are more than every layer of contact surface certain depth (present invention is 5~10cm), guarantee lower layer before initial set again
It is once vibrated, vibrating head will be inserted fastly and be pulled out slowly, and (present invention 45 no more than 1.5 times of vibrating head operating radius for mobile spacing
~60cm), point is inserted when vibrating uniformly, embarks on journey or alternating expression advances, so as not to over vibration or leakage, vibrating head time of vibration about 20~
30s, after vibrating each time, vibrating head is extracted on the side Bian Zhendong slowly.Concrete is no longer to sink, bubble-free is emerged, surface
Floodlight is degree, pays attention to not touching rapping plate when vibrating or shifts reinforcing bar, and concreting starts sprinkling maintenance after finishing final set,
Curing time is not less than 7 days；
12) presstressed reinforcing steel blanking and lashing: round arch tower king-tower uses longitudinal prestressing system, the positioning of prestressing force bellows
Reinforcing bar is laid by 30cm, and ground or trestle face blanking of the presstressed reinforcing steel steel strand wires in smooth hardening, finished product beam go to beam by loop wheel machine
Face installation, longitudinal prestressing muscle steel stranded wire penetrating adapter carry out after being arranged in each layer reinforcing bar binding, and steel strand wires check mark penetrates ripple
In pipe, front end setting guiding device is being poured, is once being worn from one end to the other end using tower crane lifting, hand fit's hoist engine
Beam；
13) tension of prestressed tendon: 90% or more must be reached in segment concrete strength, and reaches the elasticity of respective strengths
Modulus, the age of concrete be no less than 7 days after can carry out, it is longitudinal to answer concrete steel twisted wire in advance using both ends while carrying out tensioning, tensioning
Program are as follows: 0 → 20% both ends σ k(scribing line) → 40% σ k(two look up and down stretch value) → 100% σ k(press 5~10Mpa grading tension, two
End tensioning carries out simultaneously, and every grade of tensioning both ends measure elongation) → (two looking somebody up and down stretch value) hold lotus 5min(and check and show without stripped thread
As) → oil return anchors → measure amount of recovery and the exposed amount of intermediate plate.Tension of prestressed tendon carries out two-way control with stretching force and stretch value
System, controlled with stretching force based on, stretch value is to check；
14) pumping of prostressed duct is constructed: after the completion of tension of prestressed tendon, presstressed reinforcing steel duct mud jacking is carried out in 48h.
Presstressed reinforcing steel pipeline pneumatic mortar is constructed using vacuum auxiliary grouting method, and prestress hole path pressure grouting slurries use M55 cement slurry, pneumatic mortar machine
It is placed in round arch tower upper king-post strut vault, is connected to king-tower 0# block base pressure slurry hole with steel pipe, gas vent is arranged in vault, using linker
Mode keep hole path pressure grouting full using slurries itself hydraulic pressure and pneumatic mortar machine pressure；
15) it support removing: removes operation and segmentation, discrete faces is taken to remove, since top layer, successively carry out downwards, each layer
Connector can be removed when must tear this layer open.
As shown in Figure 2-5, present invention construction bracket used includes king-tower bracket and people's row bracket, and king-tower bracket is specifically tied
Structure are as follows: king-tower bracket built-in fitting 12 is set in 11 top surface of girder, connects the first of 630 × 12mm of Φ on king-tower bracket built-in fitting 12
Steel pipe post 9 and third steel pipe post 13, it is 10 connections, column that the first steel pipe post 9, which is connected with third steel pipe post 13 by intercolumniation,
Between connection be that 10 [20a channel steel is attached by flange, is arranged column cap at the top of the first steel pipe post 9, is led on column cap using 2
It crosses backing plate 15 and connects sand cylinder 5,3 I-beams (2H488 × 300) are put on sand cylinder as stringer 6, laterally mainly bearing carrier is
Fashioned iron framed bent, framed bent A2 and third steel pipe post 13 are copied tightly with transverse distribution beam 3, and the bottom end framed bent B4 is supported on third steel pipe post
On 13, apical support copy with steel plate tight on framed bent C8；Template system is placed on framed bent；People's row bracket 1 includes passing through
The second steel pipe post 102 of girder 11, the second steel pipe post 102 and third steel pipe post is arranged in people's row bracket built-in fitting 101
13 by platform connection be 105 connections, and the second steel pipe post 102 is equipped with one group of bracket 103, and job platform 104 and aisle are located at
103 upper surface of bracket；Second steel pipe post 102 uses 400 × 8mm of Φ steel pipe column, and platform connection is that 105 and bracket 103 are adopted
With 2 [channel steels of 20a.
Claims (9)
1. prestress reinforced concrete circular arch tower construction method, including surveying and locating；Support Design and production；Template is set
Meter, production；Built-in fitting is embedded；Bracket, column and the installation of connection system；The production of sand cylinder, installation；Stringer, horizontal frame and connection system
Installation；King-tower pre-pressing bracket；Template installation；Concrete cast in situs, maintenance；Presstressed reinforcing steel blanking and lashing；Presstressed reinforcing steel
It draws；Pumping of prostressed duct construction；Support removing, which comprises the following steps:
1) surveying and locating: first establishing construction control network, and to construction thin portion structure and geometric dimension, inclination angle, line style precision are fixed
Position carries out elevation setting-out with precision level levelling method；
2) support Design, production: bracket includes king-tower bracket and people's row bracket, and king-tower bracket includes king-tower bracket built-in fitting
(12), the first steel pipe post (9), third steel pipe post (13), intercolumniation connection system (10), stringer (6), sand cylinder (5), framed bent and mould
Plate system, framed bent include framed bent A(2), framed bent B(4), framed bent C(8)；King-tower side face is equipped with people's row bracket (1), people's row branch
Frame (1) includes people's row bracket built-in fitting (101), the second steel pipe post (102), platform connection system (105), bracket on girder
(103) and job platform (104)；
3) design, the production of template: template uses steel form, is thickeied by muscle in length and breadth and guarantees template compression strength, template assembly
It is connected by screw bolts；
4) built-in fitting is embedded: built-in fitting includes king-tower bracket built-in fitting (12) He Renhang bracket built-in fitting (101), and king-tower bracket is pre-
Embedded part (12) is reserved bolt arrangement, and people's row bracket built-in fitting (101) is welding structure built-in fitting, installation of embedded parts process flow
Are as follows: combining main body structure unwrapping wire → capturing position is buried embedded part → inspection adjustment → binding and fixing；
5) bracket, steel pipe post and the installation of connection system: bracket installation steps: bracket processing → elevation location measurement → built-in fitting is pre-
Bury → bracket (103) installation；First steel pipe post (9), the second steel pipe post (102), platform connection system (105) and intercolumniation connection
It is the preceding review pre-embedded steel slab plan-position of (10) installation and elevation, and releases steel pipe post stake position center, the second steel pipe is vertical
Column (102) and pre-embedded steel slab use fillet weld seam, and all steel pipe post center lines are along bridge Xiang Pinghang；
6) production of sand cylinder, installation: sand cylinder (5) is welded on the column cap at the top of the first steel pipe post (9) by billet, sand cylinder
(5) the drift sand hole on is set to the upward position 2~3cm in sand cylinder bottom, convenient for operating, veneer welded nut on the outside of drift sand hole；Sand cylinder
(5) installation need to carry out the measurement of higher degree, the main practical elevation for measuring sand cylinder rest area epimerite steel pipe stake top (14), so that it is determined that often
The practical elevation of a sand cylinder (5), and the sedimentation of reserved 3~5mm；
7) stringer, framed bent, the installation of framed bent connection system: stringer (6) is 3 I-beams, model 2H488 × 300, welding before lifting
It is integral, it is directly lifted by tower crane, stringer (6) is attached with sand cylinder (5) by weld seam, and framed bent is welded into row by fashioned iron
Frame structure, it is integral with being welded between Pin framed bent using connection system, directly hang peace；Framed bent A(2) it is used with third steel pipe post (13)
Transverse distribution beam (3) is copied tightly, framed bent B(4) bottom end is supported on third steel pipe post (13), apical support on framed bent C(8),
Copy with steel plate tight；
8) king-tower pre-pressing bracket: hanging professional jumbo bag sand loading with crane and carry out precompressed to bracket, be pressed in advance bracket set up completion with
Hierarchical loading afterwards is unloaded after loading settlement stability, and unloading while continues to observe；
9) template is installed: template uses punching block, and punching block is attached by bolt, and punching block main rib is supported directly on framed bent, main
Elder generation's mounting and adjusting bed die, outer side mold, core model when tower is constructed, then interior side form and backform are installed, the core model of king-tower uses steel pipe and side
Mould is welded and fixed, and carries out aperture in side form, to vibrate to concrete；
10) production, installation of reinforcing bar: reinforcing bar in processing workshop blanking, bend molding, finished product number pile, then have bad luck to scene
Binding installation is carried out, scene is lifted in box beam using truck crane or tower crane indirect labor, then is bound by design drawing setting-out, construction
When king-tower bottom, web reinforcement presstressed reinforcing steel are first installed, then roof steel bar is installed；
11) concrete cast in situs, maintenance: five sections of round arch tower king-post point pours completion three times, and concrete takes placement layer by layer,
Tunneling boring continuous placing, concreting start sprinkling maintenance after finishing final set, and curing time is not less than 7 days；
12) presstressed reinforcing steel blanking and lashing: round arch tower king-tower uses longitudinal prestressing system, prestressing force bellows spacer bar
It is laid by 30cm, ground or trestle face blanking of the presstressed reinforcing steel steel strand wires in smooth hardening, finished product beam go to Liang Mianan by loop wheel machine
Dress, longitudinal prestressing muscle steel stranded wire penetrating adapter carry out after being arranged in each layer reinforcing bar binding, and steel strand wires check mark penetrates prestressing force wave
In line pipe, front end setting guiding device is being poured, is once being worn from one end to the other end using tower crane lifting, hand fit's hoist engine
Beam；
13) tension of prestressed tendon: in segment, concrete strength reaches 90% or more, and reaches the elasticity modulus of respective strengths, coagulation
Native age can carry out after being no less than 7 days；
Longitudinal to answer concrete steel twisted wire in advance using both ends while carrying out tensioning, tension of prestressed tendon is carried out two-way with stretching force and stretch value
Control；
14) pumping of prostressed duct is constructed: after the completion of tension of prestressed tendon, presstressed reinforcing steel duct mud jacking is carried out in 48h；
15) support removing: removing operation and segmentation, discrete faces taken to remove, since top layer, successively carry out downwards, each layer connection
Part is removed again when must tear this layer open.
2. prestress reinforced concrete circular arch tower construction method according to claim 1, it is characterised in that in step 2
King-tower bracket specific structure are as follows: girder (11) top surface be arranged king-tower bracket built-in fitting (12), king-tower bracket built-in fitting (12)
The first steel pipe post (9) and third steel pipe post (13) of upper connection 630 × 12mm of Φ, the first steel pipe post (9) and third steel
Tube column (13) by intercolumniation connect system (10) connection, intercolumniation connection system (10) using 2 [20a channel steel is attached by flange,
Column cap is set at the top of the first steel pipe post (9), passes through backing plate (15) connection sand cylinder (5) on column cap, puts 3 I-shapeds on sand cylinder
Beam, model 2H488 × 300, as stringer (6), laterally main bearing carrier is fashioned iron framed bent, framed bent A(2) and third steel pipe
Column (13) is copied tightly with transverse distribution beam (3), framed bent B(4) bottom end is supported on third steel pipe post (13), and apical support is being arranged
Frame C(8) on, copy with steel plate tight；Template system is placed on framed bent.
3. prestress reinforced concrete circular arch tower construction method according to claim 1, it is characterised in that in step 2
People's row bracket (1) include the second steel pipe post (102) by people's row bracket built-in fitting (101) setting in girder (11), the
Two steel pipe posts (102) connect system (105) connection by platform with third steel pipe post (13), and the second steel pipe post is set on (102)
There is one group of bracket (103), job platform (104) and aisle are located at bracket (103) upper surface；Second steel pipe post (102) uses
Φ 400 × 8mm steel pipe column, platform connection system (105) and bracket (103) are all made of 2 [20a channel steels.
4. prestress reinforced concrete circular arch tower construction method according to claim 1, it is characterised in that king-tower bracket
Mounting process it is as follows: king-tower bracket built-in fitting (12) stay sets → hangs peace the first steel pipe post (9), the second steel pipe post (102)
It is installation → mould that → installation intercolumniation connection system (10) →, which hangs peace sand cylinder (5) → stringer (6) installation → truss erection → framed bent connection,
The installation of plate system；The mounting process of people's row bracket (1) is as follows: people's row bracket built-in fitting (101) stay set → mounting bracket (103) →
Peace the second steel pipe post (102) → mounting platform connection system (105) → is hung to hang peace job platform (104) and fix.
5. prestress reinforced concrete circular arch tower construction method according to claim 1, it is characterised in that in step 6)
Sand cylinder (5) in quicksand be fine sand, clay content is not more than 2%, and water content is not more than 1%, sand cylinder reserved 3~5mm when installing
Sedimentation, each sand cylinder carries out precompressed, precompression 200t with press machine.
6. prestress reinforced concrete circular arch tower construction method according to claim 1, it is characterised in that in step 8)
The king-tower pre-pressing bracket 120% professional jumbo bag sand loading that uses prefabricating load to be self-possessed for king-tower precompressed carried out to bracket, when precompressed
The load of point three-level, king-tower order of placement is consistent with pouring order of concrete when load, and first time loaded weight is what king-tower was self-possessed
50%, it holds and carries out second of load after lotus is stablized, loaded weight is the 50% of king-tower self weight, holds and carries out adding for the third time after lotus is stablized
It carries, loaded weight is the 20% of king-tower self weight, and precompressed range is king-tower width range.
7. prestress reinforced concrete circular arch tower construction method according to claim 1, it is characterised in that in step 9)
King-tower outer steel mould aperture when, hole is arranged as direction across bridge 50cm mono-, along bridge to 100cm mono-.
8. prestress reinforced concrete circular arch tower construction method according to claim 1, it is characterised in that in step 11)
Round arch tower king-post points five sections pour three times in five sections of fingers king-post two sides concrete be respectively divided into and first pour section and reserve after
Section is poured, centre is tower top closure segment, is first symmetrically poured the concrete in section and reserved after-pouring section that first pours of king-post two sides
It builds, then carries out tower top closure segment and pour, be divided into and pour completion three times, concrete takes placement layer by layer, and every layer is 45-55cm, often
The height that pours of hour is 0.8-1.2m.
9. prestress reinforced concrete circular arch tower construction method according to claim 1, it is characterised in that in step 13)
Tension of prestressed tendon, it is longitudinal to answer concrete steel twisted wire in advance using both ends while carrying out tensioning, stressing sequence are as follows: 0 → 20% σ of σ k → 40%
→ 100% σ k → holds lotus 5min → oil return anchors → and measures amount of recovery and intermediate plate exposed amount k.
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| CN109403466B (en) * | 2018-10-25 | 2020-11-10 | 中国十七冶集团有限公司 | Construction method of high-altitude suspended embedded part of reinforced concrete beam film structure |
| CN109507387A (en) * | 2018-10-26 | 2019-03-22 | 扬州工业职业技术学院 | A kind of construction method of domes original position accumulated loading test |
| CN109629456B (en) * | 2019-01-16 | 2024-03-22 | 中交一公局海威工程建设有限公司 | Precast beam sideslip device and precast beam sideslip system |
| CN110258339A (en) * | 2019-06-05 | 2019-09-20 | 中建八局第三建设有限公司 | A kind of overbridge roof beam structure bridge construction method |
| CN114412144B (en) * | 2022-03-01 | 2023-10-27 | 延安大学 | Assembled arch building construction device |
| CN114481854A (en) * | 2022-03-02 | 2022-05-13 | 中国建筑第六工程局有限公司 | Method for anchoring prestressed pipeline construction by using light positioning bracket |
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| CN203613467U (en) * | 2013-12-26 | 2014-05-28 | 中铁上海工程局有限公司 | Steel pipe bracket for construction of arch tower in oblique arch tower double-cable plane pre-stressed concrete cable-stayed bridge |
| CN104975566B (en) * | 2013-12-26 | 2016-08-24 | 中铁上海工程局集团有限公司 | Apply the steel pipe support in cable-stayed bridge arch tower is constructed |
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