CN108004925A - Prestress reinforced concrete circular arch tower construction method - Google Patents
Prestress reinforced concrete circular arch tower construction method Download PDFInfo
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- CN108004925A CN108004925A CN201711231142.9A CN201711231142A CN108004925A CN 108004925 A CN108004925 A CN 108004925A CN 201711231142 A CN201711231142 A CN 201711231142A CN 108004925 A CN108004925 A CN 108004925A
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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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- 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 method, it includes surveying and locating；Support Design and making；The design of template, make；Built-in fitting is buried；Bracket, column and the installation of connection system；Sand cylinder makes, installation；Longeron, horizontal frame and the installation of connection system；King-tower pre-pressing bracket；Model sheetinstallat；Concrete cast in situs, maintenance；Presstressed reinforcing steel blanking and lashing；Tension of prestressed tendon；Pumping of prostressed duct is constructed；Support removing.Support system structure of the invention by using steel pipe column+framed bent, construction for prestress reinforced concrete circular arch tower of constructing, the construction period is greatly shortened, reduces labor strength and difficulty of construction, the harmony of stress change among the construction of effective guarantee domes, it ensure that the operation security in bridge construction and later stage, with obvious 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 technology
According to the data grasped at present, prestressed reinforced concrete bridge tower tower with A types, inverted Y-shaped, H-type, brilliant and
Based on only Deethanizer design, corresponding construction technology technology is more ripe, is generally continuously constructed using overmolded section construction and sliding formwork, and pre-
The circular arch tower tower type design of stress reinforced concrete circular arch tower bridge is the first for the whole nation at present, does not also temporarily find correlation abroad
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 two kinds of Support Method and no rack technique.Stent
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
The advantages of big is that Large-scale Hoisting equipment is not required, the drawback is that working rack template consumption is big, the construction period is long, input
Manpower is more, steel pipe support is set up more demanding to foundation bearing capacity, and conventional full framing steel tube member bar carries in itself
Ability is limited, and security risk is larger, and it is more to pour segmentation, piecemeal for large volume concrete structural, and pouring quality control is arranged
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 the mountainous region mound forest land area that weak ground, pier stud height, stent set up difficulty
Bridge superstructure is constructed, and main construction characteristic is prefabricated using facilities such as pylon, cable, anchor ear or steering structures be segmented
Installation, hanging operation time length, security risk is larger, is segmented Beam Elevation error when assembly is closed up for both ends section by section and easily exceeds
Critical field, totally unfavorable for structure stress, quality control difficulty is big.The successful implementation of the present 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.
The content of the invention
For the above-mentioned problems in the prior art, it is an object of the invention to provide a kind of prestressed reinforced concrete
Circular 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 making；The design of template, make；Built-in fitting is buried；Bracket, column and the installation of connection system；Sand cylinder makes, installation；Longeron,
Horizontal frame and the installation of connection system；King-tower pre-pressing bracket；Model sheetinstallat；Concrete cast in situs, maintenance；Presstressed reinforcing steel blanking with
Lashing；Tension of prestressed tendon；Pumping of prostressed duct is constructed；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 the precision such as physical dimension, inclination angle, line style
Positioning, elevation setting-out is carried out with precision level levelling method；
2）Support Design, making：Stent includes king-tower stent and people's row stent, and king-tower stent includes king-tower stent built-in fitting, the
One steel pipe post, the 3rd steel pipe post, intercolumniation connection system, longeron, sand cylinder, framed bent and template system, framed bent include framed bent A, row
Frame B, framed bent C；King-tower side face is equipped with people's row stent, and people's row stent includes people's row stent built-in fitting, the second steel on girder
Tube column, platform connection system, bracket and job platform；
3）The design of template, make：Template uses steel form, is thickeied by muscle in length and breadth and ensures template compression strength, template assembly
It is connected by screw bolts；
4）Built-in fitting is buried：Built-in fitting includes king-tower stent built-in fitting and people's row stent built-in fitting, and king-tower stent built-in fitting is pre-
Bolt arrangement is stayed, people's row stent built-in fitting is welding structure built-in fitting, and installation of embedded parts technological process is：Combining main body structure is put
Line → capturing position, which buries, puts embedded part → inspection adjustment → banding fixed；
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 installation；Review pre-buried steel before first the second steel pipe post of steel pipe post, platform connection system and the installation of intercolumniation connection system
Plate plan-position and elevation, and steel pipe post stake position center is released, the second steel pipe post uses angle welding with pre-embedded steel slab
Welding, all steel pipe post center lines along bridges to parallel；
6）Sand cylinder makes, installation：Sand cylinder is welded on the column cap at the top of the first steel pipe post by billet, the drift sand on sand cylinder
Hole is arranged at the upward 2~3cm positions in sand cylinder bottom, easy to operation, veneer welded nut on the outside of drift sand hole；The installation of sand cylinder need to carry out height
Journey measures, the main actual elevation for measuring sand cylinder rest area epimerite steel pipe stake top, so that it is determined that the actual elevation of each sand cylinder, and
The sedimentation of reserved 3~5mm；
7）Longeron, framed bent, the installation of framed bent connection system：Longeron is 3 I-beams (2H488 × 300), and welding is integral before lifting,
Directly lifted by tower crane, longeron is attached with sand cylinder by weld seam, and framed bent is welded into bent structure by shaped steel, is arranged with Pin
It is integral using the welding of connection system between frame, directly hang peace；Framed bent A and the 3rd steel pipe post are copied tightly with transverse distribution beam, framed bent B
Bottom is supported on the 3rd steel pipe post, and apical support with steel plate copy tight on framed bent C；
8）King-tower pre-pressing bracket：Hang professional jumbo bag sand loading with crane and precompressed carried out to stent, be pressed in advance stent set up completion with
Hierarchical loading afterwards, after loading settlement stability, is unloaded, and unloading while continues to observe；
9）Model sheetinstallat：Template uses punching block, and punching block is attached by bolt, and punching block main rib is supported directly on framed bent, main
The core of tower is welded and fixed using steel pipe with side form, and carries out perforate in side form, to vibrate to concrete；
10）Making, the installation of reinforcing bar：Reinforcing bar in processing workshop blanking, bend shaping, finished product numbering pile, then have bad luck to scene
By design drawing setting-out, binding installation；
11）Concrete cast in situs, maintenance：Five sections of circular arch tower king-post point pours completion three times, and concrete takes placement layer by layer,
Tunneling boring continuous placing, concreting start watering maintenance after finishing final set, and curing time is not less than 7 days；
12）Presstressed reinforcing steel blanking and lashing：Circular arch tower king-tower uses longitudinal prestressing system, prestressing force bellows spacer bar
Laid by 30cm, presstressed reinforcing steel steel strand wires go to Liang Mianan in the ground of smooth hardening or the blanking of trestle face, finished product beam 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 the number and penetrate prestressing force ripple
In line pipe, guider is set having poured front end, is lifted using tower crane, hand fit's hoist engine is once worn from one end to the other end
Beam；
13）Tension of prestressed tendon：In segment, concrete strength reaches more than 90%, and reaches the elasticity modulus of respective strengths, coagulation
Native age can carry out after being no less than 7 days.Longitudinal direction answers concrete steel twisted wire to be carried out at the same time tensioning using both ends in advance, tension of prestressed tendon with
Stretching force and stretch value carry out double-direction 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 takes segmentation, discrete faces to remove, and since top layer, successively carries out downwards, each layer connection
Part is removed again when must tear this layer open.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that step 2）In king-tower stent tool
Body structure is：King-tower stent built-in fitting is set in girder top surface, the first steel of 630 × 12mm of Φ is connected on king-tower stent built-in fitting
Tube column and the 3rd steel pipe post, the first steel pipe post and the 3rd steel pipe post connect system's connection by intercolumniation, and intercolumniation connection system adopts
With 2, [20a channel steels are attached by flange, setting column cap at the top of the first steel pipe post, and sand is connected by backing plate on column cap
Cylinder, 3 I-beams (2H488 × 300) are put on sand cylinder and be used as longeron, and laterally main bearing carrier is shaped steel framed bent, framed bent A and
3rd steel pipe post is copied tightly with transverse distribution beam, and framed bent B bottoms are supported on the 3rd steel pipe post, apical support on framed bent C,
With steel plate copy tight；Template system is placed on framed bent.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that step 2）In people's row stent bag
The second steel pipe post that girder is arranged on by people's row stent built-in fitting is included, the second steel pipe post and the 3rd 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 stood
Column uses Φ 400 × 8mm steel pipe columns, and platform connection system and bracket use 2 [20a channel steels.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that the mounting process of king-tower stent is such as
Under：King-tower stent built-in fitting stays and sets → hang the first steel pipe post of peace, the second steel pipe post → installation intercolumniation connection be → hangs peace sand
Cylinder → longeron installation → truss erection → framed bent connection is installation → template system installation；The mounting process of people's row stent is as follows：
People's row stent 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
It is and fixed.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that step 6）In sand cylinder in stream
Sand is fine sand, its clay content is not more than 2%, and water content is not more than 1%, and sand cylinder reserves the sedimentation of 3~5mm, each sand cylinder when installing
Precompressed is carried out with forcing press, its precompression is 200t.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that step 8）In king-tower outer steel mould
During perforate, 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 step 9）In king-tower stent it is pre-
Pressure uses prefabricating load to carry out precompressed to stent for the 120% professional jumbo bag sand loading that king-tower is conducted oneself with dignity, and precompressed time-division three-level loads,
King-tower order of placement is consistent with pouring order of concrete during loading, and first time loaded weight is the 50% of king-tower dead weight, holds lotus stabilization
Carry out loading for second afterwards, loaded weight is the 50% of king-tower dead weight, holds after lotus is stablized and carries out third time loading, loaded weight is
The 20% of king-tower dead weight, precompressed scope is king-tower width range.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that step 11）In circular arch tower
Five sections during king-post points five sections pours three times refer to king-post both sides concrete and are respectively divided into and first pour section and reserved after-pouring section, middle
For tower top closure segment, first the concrete in section and reserved after-pouring section that first pours of king-post both sides is symmetrically poured, then carry out tower
Top closure segment pours, and is divided into and pours completion three times, concrete takes placement layer by layer, and every layer is 45-55cm, hourly to pour height
Spend for 0.8-1.2m.
The prestress reinforced concrete circular arch tower construction method, it is characterised in that step 13）In presstressed reinforcing steel
Tensioning, longitudinal direction answer concrete steel twisted wire to be carried out at the same time tensioning using both ends in advance, and stressing sequence is：0→20%σk→40%σk→100%σk
→ 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 for circular arch tower upper king-post strut structure design characteristic, using the support system structure of steel pipe column+framed bent, for applying
The construction of work prestress reinforced concrete circular arch tower, and king-tower stent and operating platform Specialty Design are carried out, stent scene is taken
If the time is short, sectional is integrally installed using lifting equipment, and mechanical equipment effective rate of utilization is high, be greatly shortened the construction period,
Labor strength is reduced, required manually less, convenient construction, ensure safety and quality, reduce to greatest extent to surrounding enviroment
Influence it is most favourable, there is obvious overall economic efficiency and social benefit；Upper king-post strut concreting segmentation is few, reduces existing
Number is poured, reduce difficulty of construction, the harmony of stress change, meets design among effective guarantee domes construction
Technical requirements and structure installation quality, it is ensured that the operation security in bridge construction and later stage, while engineering has been saved to greatest extent
Construction land tenure, reduces the destruction to river shoal geologic structure and vegetation, protects ecological environment, constructs to similar bridge structure
With extensive application value and reference.
Brief description of the drawings
Fig. 1 is the main construction process figure of the present invention；
Fig. 2 is the stent cross-sectional view of the present invention；
Fig. 3 is the A-A section enlarged structure schematic diagrams in Fig. 1；
Fig. 4 is the B-B section enlarged structure schematic diagrams in Fig. 1；
Fig. 5 is the C-C section enlarged structure schematic diagrams in Fig. 1.
In figure：1- people's row stent, 101- people's row stent built-in fitting, the second steel pipe posts of 102-, 103- brackets, 104- operations
Platform, 105- platforms connection system, 2- framed bents A, 3- transverse distribution beam, 4- framed bents B, 5- sand cylinder, 6- longerons, 7- arch king-towers, 8-
The first steel pipe post of framed bent C, 9-, 10- intercolumniations connection system, 11- girders, 12- king-tower stent built-in fittings, the 3rd steel pipe posts of 13-,
14- epimerite steel pipe stake tops, 15- backing plates.
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 is set up
Meter and making；The design of template, make；Built-in fitting is buried；Bracket, column and the installation of connection system；Sand cylinder makes, installation；Longeron,
Horizontal frame and the installation of connection system, specifically comprise the following steps：
1）Surveying and locating：The foundation of construction control network, including the repetition measurement of main control net and the encryption of Construction control site, construction are thin
The precision positioning such as portion's structure and physical dimension, inclination angle, line style, before construction, checks 7 axis line position of arch king-tower, plane
And vertical control point and related survey data, and carry out benefit survey, reinforce, total powerstation three-dimensional is sat with high precision for construction lofting control
Based on mark method, a variety of means that are combined of measurement control methods ensure being accurately positioned for works plan-position, with accurate water
Quasi- instrument levelling method carries out elevation setting-out；
2）Support Design, making：The present invention is by studying main arch shape king-tower 7, to ensure king-tower supporting structure stability,
Constructed using the construction method of steel pipe column+framed bent, its stent includes king-tower stent and people's row stent 1, and king-tower stent includes
King-tower stent built-in fitting 12, the first steel pipe post 9, the 3rd steel pipe post 13, intercolumniation connection be 10, longeron 6, sand cylinder 5, framed bent and
Template system, framed bent include framed bent A2, framed bent B4, framed bent C8, and longeron 6 is 2H488 × 300, the first steel pipe post 9, the 3rd steel
Tube column 13 uses Φ 630 × 12mm steel pipes, and [20a, is attached between steel pipe, framed bent by flange using 2 for fastener for connection system
A 2, framed bent B 4, framed bent C 8 are manufactured by shaped steel, it is mainly using the shaped steel of HN200 × 100 and HW200 × 100, between shaped steel
Connected by the way of welding, single section framed bent A 2 is connected as a Pin, framed bent B4, framed bent C 8 by 4 monolithics by connecting system
Respectively a Pin is connected as by connecting system by 10 monolithics；In order to facilitate construction period model sheetinstallat operation, the present invention is in king-tower branch
Frame side is equipped with people's row stent 1, also referred to as operating platform, and people's row stent 1 includes people's row stent built-in fitting 101, second on girder
Steel pipe post 102（Φ400×8mm）, platform connection be 105, bracket 103 and job platform 104, platform connection is 105 and support
Using 2, [channel steel of 20a, bracket 103 set aisle to frame 103 above, form job platform 104 and upper and lower aisle；
The mounting process of king-tower stent is as follows：King-tower stent built-in fitting 12 stays and sets → hang the first steel pipe post 9 of peace, the second steel pipe is stood
Column 13 → installation intercolumniation connection be 10 → hang 5 → longeron of peace sand cylinder 6 install → truss erection → framed bent connection is installation → template
System is installed；The mounting process of people's row stent 1 is as follows：People's row stent built-in fitting 101, which stays, to be set → mounting bracket 103 → and hangs peace second
The connection of 102 → mounting platform of steel pipe post is 105 → hang peace job platform 104 and fixed.
3）The design of template, make：The stay in place form of arch king-tower 7 uses 5mm steel plates using customization steel form, steel form
Make, thickeied by muscle in length and breadth and ensure template compression strength, template assembly is connected by screw bolts, its connecting hole is away from, nose end away from phase
To fixation；
4）Built-in fitting is buried：Built-in fitting includes king-tower stent built-in fitting 12 and people's row stent built-in fitting 101, king-tower stent built-in fitting
12 be reserved bolt arrangement, is arranged on girder 11, people's row stent built-in fitting 101 is welding structure built-in fitting, is welded on girder
11 side, installation of embedded parts technological process are：Combining main body structure unwrapping wire → capturing position bury put the adjustment of embedded part → inspection →
Banding fixed, 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 → built-in fitting is pre-
Bury → bracket 103 installs；First steel pipe post, 9 second steel pipe post 102, platform connection be 105 and intercolumniation connection be 10 installations
Preceding review pre-embedded steel slab plan-position and elevation, and release steel pipe post stake position center, the second steel pipe post 102 with it is pre-buried
Steel plate uses fillet weld seam, and leg is highly 10mm, and all steel pipe post center lines are along bridges, to parallel, pile rear column hangs down
Directly degree should meet to be not more than 10mm, and column top mark is high and the design high deviation of top mark is less than 3mm, and steel pipe post stake position centre deviation is not
More than 5mm；
6）Sand cylinder makes, installation：Sand cylinder 5 is welded on by billet on the column cap at the top of the first steel pipe post 9, on sand cylinder 5
Drift sand hole is arranged at the upward 2~3cm positions in sand cylinder bottom, and easy to operation, veneer welded nut, matches at the same time on the outside of drift sand hole
Correspondingly sized screw rod；Sand cylinder is using the fine sand after sieving, and good fluidity, clay content is not more than 2%, and sand is dried place
Reason so that water content is not more than 1%, and 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 stake top
14 actual elevations, so that it is determined that the actual elevation of each sand cylinder, and the sedimentation of reserved 3~5mm；5 design ultimate bearing capacity of sand cylinder is
200t, to eliminate the sedimentation during 5 use of sand cylinder, the present invention can carry out precompressed to each sand cylinder 5 with forcing press, its precompression
For 200t, sand cylinder height is measured after the decrement of sand is stablized after being pre-stressed to precompression, design load is such as higher by, illustrates that sand needs more
Sand amount in sand cylinder is reduced to press again；
7）Longeron, framed bent, the installation of framed bent connection system：Longeron 6 is 3 I-beams (2H488 × 300), and welding is integral before lifting,
Directly lifted by tower crane, longeron 6 is attached with sand cylinder 5 by the weld seam of 6mm, and framed bent of the invention is as the main of stent
Spandrel girder exists, and framed bent is welded into bent structure by shaped steel, and integral with being welded between Pin framed bents using connection system, framed bent connects
Connect is also directly to hang peace to be welded into framed bent；Framed bent A2 and the 3rd steel pipe post 13 are copied tightly with transverse distribution beam 3, framed bent B4 bottoms
End is supported on the 3rd steel pipe post 13, apical support on framed bent C8, due on framed bent B4 there are greater level power, need to be to row
Frame C8 Local Members are reinforced, and with steel plate copy tightly between framed bent B4 and framed bent C8, horizontal force is passed directly to framed bent C8
On；
8）King-tower pre-pressing bracket：Precompressed is carried out to king-tower stent with professional jumbo bag sand loading, prefabricating load is the 120% of king-tower dead weight,
Precompressed scope is king-tower width range, and hang jumbo bag with crane carries out precompressed to stent, is pressed in stent in advance and sets up completion with laggard
OK, a point three-level loads, and first time loaded weight is the 50% of king-tower dead weight, holds and carries out loading for the second time after lotus is stablized, loaded weight
For the 50% of king-tower dead weight, hold and third time loading is carried out after lotus is stablized, loaded weight is the 20% of king-tower dead weight, king-tower cloth during loading
It is consistent with pouring order of concrete to put order；King-tower observation position be located at often across L/2, at L/4, often arrange steel pipe post point it is left,
In, right three points.The fixed observer bar at a position, in order to settlement observation.Settlement observation is carried out using spirit level, lays good see
Its bar top mark height is determined after measuring staff, before loading, after loading for the first time, every 2 hours observation once, observes sedimentation twice in succession
Amount is no more than 3mm, and when settling amount is zero, carries out second and load, by this step, up to third time loaded.For the third time
After loading settlement stability, unloaded, unloading is uniformly unloaded using hand fit's crane handling sand pocket, and unloading while continues to see
Survey, observation has been recorded 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, first during Construction of Pylon
Mounting and adjusting bed die, outer side mold, core, then interior side form and backform are installed, the core of king-tower is welded and fixed using steel pipe with side form,
And perforate is carried out in side form, to vibrate to concrete；Side form carry out perforate, be arranged as direction across bridge 50cm mono-, along bridge to
100cm mono-, ensures construction operation platform, to vibrate to concrete；
10）Making, the installation of reinforcing bar：Reinforcing bar in processing workshop blanking, bend shaping, finished product numbering pile, then have bad luck to scene
Carry out binding installation, scene is lifted in box beam using automobile or tower crane indirect labor, then is bound by design drawing setting-out, during construction
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 circular arch tower king-post point pours completion three times, and five sections refer to king-post both sides coagulation
Soil is respectively divided into and first pours section and reserved after-pouring section, and centre is tower top closure segment, first first pours section and pre- to king-post both sides
Stay the concrete in after-pouring section symmetrically to pour, then carry out tower top closure segment and pour, be divided into and pour completion three times, tower top closure segment
Pour the time and both sides first poured section time interval as 5 days, concrete takes placement layer by layer, and every layer is 45-55cm, is preferably
50cm, tunneling boring continuous placing, the height hourly that pours is 0.8-1.2m, is preferably 1m, concrete vibrating uses plug-in type
Vibrator, depth of vibrating exceed every layer of contact surface certain depth（The present invention is 5~10cm）, ensure lower floor before initial set again into
Row once vibrates, and vibrating head will soon be inserted and pulled out slowly, and mobile spacing is not more than 1.5 times of vibrating head operating radius（The present invention for 45~
60cm）, inserted when vibrating a little uniformly, embark on journey or alternating expression advances, so as not to cross to shake or leakage, vibrating head time of vibration about 20~30s,
After vibrating each time, blow slowly in vibration and extract vibrating head.Concrete is no longer to sink, bubble-free is emerged, surface floodlight
For degree, pay attention to not touching rapping plate when vibrating or shift reinforcing bar, concreting starts watering maintenance, maintenance after finishing final set
Time is not less than 7 days；
12）Presstressed reinforcing steel blanking and lashing：Circular arch tower king-tower uses longitudinal prestressing system, prestressing force bellows spacer bar
Laid by 30cm, presstressed reinforcing steel steel strand wires go to Liang Mianan in the ground of smooth hardening or the blanking of trestle face, finished product beam 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 are checked the number and penetrated in bellows,
Guider is set pouring front end, is lifted using tower crane, hand fit's hoist engine is from one end to lashing of the other end；
13）Tension of prestressed tendon：More than 90% must be reached in segment concrete strength, and reach the elasticity modulus of respective strengths,
The age of concrete can carry out after being no less than 7 days, and longitudinal direction answers concrete steel twisted wire to be carried out at the same time tensioning, stressing sequence using both ends in advance
For： 0→20%σk（Rule at both ends）→40%σk（Two looking somebody up and down stretch values）→100%σk（By 5~10Mpa grading tensions, both ends
Drawing is carried out at the same time, and every grade of tensioning both ends measure elongation）→（Two looking somebody up and down stretch values）Hold lotus 5min（Check without stripped thread phenomenon）
→ oil return anchors → measures amount of recovery and the exposed amount of intermediate plate.Tension of prestressed tendon carries out double-direction control with stretching force and stretch value,
Based on being controlled with stretching force, stretch value is checks；
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.In advance should
Power muscle pipeline pneumatic mortar is constructed using vacuum auxiliary grouting method, and prestress hole path pressure grouting slurries use M55 cement mortars, and pneumatic mortar machine is put
In circular arch tower upper king-post strut vault, king-tower 0# blocks base pressure slurry hole is connected to steel pipe, vault sets exhausting-gas hole, using the side of linker
Formula keeps hole path pressure grouting full using slurries itself hydraulic pressure and pneumatic mortar machine pressure；
15）Support removing：Removing operation takes segmentation, discrete faces to remove, and since top layer, successively carries out downwards, each layer connection
Part can be removed when must tear this layer open.
As shown in Figure 2-5, present invention construction stent used includes king-tower stent and people's row stent, king-tower stent are specifically tied
Structure is：King-tower stent built-in fitting 12 is set in 11 top surface of girder, the first of 630 × 12mm of Φ is connected on king-tower stent built-in fitting 12
9 and the 3rd steel pipe post 13 of steel pipe post, it is 10 connections that the first steel pipe post 9 is connected with the 3rd steel pipe post 13 by intercolumniation, column
Between connection be that 10 [20a channel steels are attached by flange, and the top of the first steel pipe post 9 sets column cap, leads on column cap using 2
Cross backing plate 15 and connect sand cylinder 5,3 I-beams (2H488 × 300) are put on sand cylinder and are used as longeron 6, laterally main bearing carrier is
Shaped steel framed bent, framed bent A2 and the 3rd steel pipe post 13 are copied tightly with transverse distribution beam 3, and framed bent B4 bottoms are supported on the 3rd steel pipe post
On 13, apical support with steel plate copy tight on framed bent C8；Template system is placed on framed bent；People's row stent 1 includes passing through
People's row stent built-in fitting 101 is arranged on the second steel pipe post 102 of girder 11, the second steel pipe post 102 and the 3rd steel pipe post
13 by platform connection be 105 connections, the second steel pipe post 102 is equipped with one group of bracket 103, job platform 104）It is located at aisle
103 upper surface of bracket；Second steel pipe post 102 uses Φ 400 × 8mm steel pipe columns, and platform connection is that 105 and bracket 103 are adopted
With 2 [channel steels of 20a.
Claims (10)
1. prestress reinforced concrete circular arch tower construction method, it is characterised in that including surveying and locating；Support Design and making；
The design of template, make；Built-in fitting is buried；Bracket, column and the installation of connection system；Sand cylinder makes, installation；Longeron, horizontal frame
And connection system installation；
King-tower pre-pressing bracket；Model sheetinstallat；Concrete cast in situs, maintenance；Presstressed reinforcing steel blanking and lashing；Presstressed reinforcing steel
Draw；Pumping of prostressed duct is constructed；Support removing.
2. prestress reinforced concrete circular arch tower construction method according to claim 1, it is characterised in that specifically include
Following steps：
1）Surveying and locating：Construction control network is first established, and to construction thin portion structure and the precision such as physical dimension, inclination angle, line style
Positioning, elevation setting-out is carried out with precision level levelling method；
2）Support Design, making：Stent includes king-tower stent and people's row stent, and king-tower stent includes king-tower stent built-in fitting
（12）, the first steel pipe post（9）, the 3rd steel pipe post（13）, intercolumniation connection system（10）, longeron（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 stent（1）, people's row branch
Frame（1）Including people's row stent built-in fitting on girder（101）, the second steel pipe post（102）, platform connection system（105）, bracket
（103）And job platform（104）；
3）The design of template, make：Template uses steel form, is thickeied by muscle in length and breadth and ensures template compression strength, template assembly
It is connected by screw bolts；
4）Built-in fitting is buried：Built-in fitting includes king-tower stent built-in fitting（12）With people's row stent built-in fitting（101）, king-tower stent is pre-
Embedded part（12）To reserve bolt arrangement, people's row stent built-in fitting（101）For welding structure built-in fitting, installation of embedded parts technological process
For：Combining main body structure unwrapping wire → capturing position, which buries, puts embedded part → inspection adjustment → banding fixed；
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）Second steel pipe post（102）, platform connection system（105）And intercolumniation connection
System（10）Review pre-embedded steel slab plan-position and elevation before installation, and steel pipe post stake position center is released, the second steel pipe is stood
Column（102）Use fillet weld seam with pre-embedded steel slab, all steel pipe post center lines along bridges to parallel；
6）Sand cylinder makes, installation：Sand cylinder（5）First steel pipe post is welded on by billet（9）On the column cap at top, sand cylinder
（5）On drift sand hole be arranged at the upward 2~3cm positions in sand cylinder bottom, easy to operation, veneer welded nut on the outside of drift sand hole；Sand cylinder
（5）Installation need to carry out the measurement of higher degree, main to measure sand cylinder rest area epimerite steel pipe stake top（14）Actual elevation, so that it is determined that often
A sand cylinder（5）Actual elevation, and the sedimentation of reserved 3~5mm；
7）Longeron, framed bent, the installation of framed bent connection system：Longeron（6）For 3 I-beams (2H488 × 300), it is welded into before lifting whole
Body, is directly lifted, longeron by tower crane（6）With sand cylinder（5）It is attached by weld seam, framed bent is welded into framed bent knot by shaped steel
Structure, it is integral with being welded between Pin framed bents using connection system, directly hang peace；Framed bent A（2）With the 3rd steel pipe post（13）With transverse direction
Distribution beam（3）Copy tight, framed bent B（4）Bottom is supported on the 3rd steel pipe post（13）On, apical support is in framed bent C（8）On, use steel
Plate copy tight；
8）King-tower pre-pressing bracket：Hang professional jumbo bag sand loading with crane and precompressed carried out to stent, be pressed in advance stent set up completion with
Hierarchical loading afterwards, after loading settlement stability, is unloaded, and unloading while continues to observe；
9）Model sheetinstallat：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 when tower is constructed, then interior side form and backform are installed, the core of king-tower uses steel pipe and side
Mould is welded and fixed, and carries out perforate in side form, to vibrate to concrete；
10）Making, the installation of reinforcing bar：Reinforcing bar in processing workshop blanking, bend shaping, finished product numbering pile, then have bad luck to scene
Carry out binding installation, scene is lifted in box beam using automobile or tower crane indirect labor, then is bound by design drawing setting-out, during construction
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 circular arch tower king-post point pours completion three times, and concrete takes placement layer by layer,
Tunneling boring continuous placing, concreting start watering maintenance after finishing final set, and curing time is not less than 7 days；
12）Presstressed reinforcing steel blanking and lashing：Circular arch tower king-tower uses longitudinal prestressing system, prestressing force bellows spacer bar
Laid by 30cm, presstressed reinforcing steel steel strand wires go to Liang Mianan in the ground of smooth hardening or the blanking of trestle face, finished product beam 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 the number and penetrate prestressing force ripple
In line pipe, guider is set having poured front end, is lifted using tower crane, hand fit's hoist engine is once worn from one end to the other end
Beam；
13）Tension of prestressed tendon：In segment, concrete strength reaches more than 90%, and reaches the elasticity modulus of respective strengths, coagulation
Native age can carry out after being no less than 7 days；
Longitudinal direction answers concrete steel twisted wire to be carried out at the same time tensioning using both ends in advance, and 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 takes segmentation, discrete faces to remove, and since top layer, successively carries out downwards, each layer connection
Part is removed again when must tear this layer open.
3. prestress reinforced concrete circular arch tower construction method according to claim 2, it is characterised in that step 2）In
King-tower stent concrete structure be：In girder（11）Top surface sets king-tower stent built-in fitting（12）, king-tower stent built-in fitting（12）
The first steel pipe post of 630 × 12mm of upper connection Φ（9）With the 3rd steel pipe post（13）, the first steel pipe post（9）With the 3rd steel
Tube column（13）Connected by intercolumniation and be（10）Connection, intercolumniation connection system（10）Using 2 [20a channel steels are attached by flange,
First steel pipe post（9）Top sets column cap, passes through backing plate on column cap（15）Connect sand cylinder（5）, 3 I-beams are put on sand cylinder
(2H488 × 300) are used as longeron（6）, laterally main bearing carrier is shaped steel framed bent, framed bent A（2）With the 3rd steel pipe post（13）
With transverse distribution beam（3）Copy tight, framed bent B（4）Bottom is supported on the 3rd steel pipe post（13）On, apical support is in framed bent C（8）
On, with steel plate copy tight；Template system is placed on framed bent.
4. prestress reinforced concrete circular arch tower construction method according to claim 2, it is characterised in that step 2）In
People's row stent（1）Including passing through people's row stent built-in fitting（101）It is arranged on girder（11）The second steel pipe post（102）, the
Two steel pipe posts（102）With the 3rd steel pipe post（13）Connected by platform and be（105）Connection, the second steel pipe post（102）On set
There is one group of bracket（103）, job platform（104）It is located at bracket with aisle（103）Upper surface；Second steel pipe post（102）Using
Φ 400 × 8mm steel pipe columns, platform connection system（105）And bracket（103）Use 2 [20a channel steels.
5. prestress reinforced concrete circular arch tower construction method according to claim 2, it is characterised in that king-tower stent
Mounting process it is as follows：King-tower stent built-in fitting（12）Stay and set → hang the first steel pipe post of peace（9）, the second steel pipe post（13）→
Intercolumniation connection system is installed（10）→ hang peace sand cylinder（5）→ longeron（6）Installation → truss erection → framed bent connection is installation → template
System is installed；People's row stent（1）Mounting process it is as follows：People's row stent built-in fitting（101）Stay and set → mounting bracket（103）→ hang
Pacify the second steel pipe post（102）→ mounting platform connection system（105）→ hang peace job platform（104）It is and fixed.
6. prestress reinforced concrete circular arch tower construction method according to claim 2, it is characterised in that step 6）In
Sand cylinder（5）Interior quicksand is fine sand, its clay content is not more than 2%, and water content is not more than 1%, and sand cylinder reserves 3~5mm when installing
Sedimentation, each sand cylinder carries out precompressed with forcing press, its precompression is 200t.
7. prestress reinforced concrete circular arch tower construction method according to claim 2, it is characterised in that step 8）In
King-tower pre-pressing bracket use prefabricating load to carry out precompressed to stent for the 120% professional jumbo bag sand loading that king-tower is conducted oneself with dignity, during precompressed
The loading of point three-level, king-tower order of placement is consistent with pouring order of concrete during loading, and first time loaded weight is conducted oneself with dignity for king-tower
50%, hold and second of loading is carried out after lotus is stablized, loaded weight is the 50% of king-tower dead weight, holds and carries out adding for the third time after lotus is stablized
Carry, loaded weight is the 20% of king-tower dead weight, and precompressed scope is king-tower width range.
8. prestress reinforced concrete circular arch tower construction method according to claim 2, it is characterised in that step 9）In
King-tower outer steel mould perforate when, hole is arranged as direction across bridge 50cm mono-, along bridge to 100cm mono-.
9. prestress reinforced concrete circular arch tower construction method according to claim 2, it is characterised in that step 11）In
Circular arch tower king-post points five sections pour three times in five sections refer to king-post both sides concrete be respectively divided into first pour section and it is reserved after
Section is poured, centre is tower top closure segment, and first the concrete in section and reserved after-pouring section that first pours of king-post both sides is symmetrically poured
Build, then carry 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.
10. prestress reinforced concrete circular arch tower construction method according to claim 2, it is characterised in that step 13）
In tension of prestressed tendon, longitudinal direction answer concrete steel twisted wire to be carried out at the same time tensioning using both ends in advance, stressing sequence is：0→20%σk→
→ 100% σ k → hold lotus 5min → oil return anchors → and measure amount of recovery and the exposed amount of intermediate plate 40% σ k.
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