CN105275213A - An eggshell-shaped unbounded prestress angle-changing tensioning construction method - Google Patents
An eggshell-shaped unbounded prestress angle-changing tensioning construction method Download PDFInfo
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- CN105275213A CN105275213A CN201410303606.2A CN201410303606A CN105275213A CN 105275213 A CN105275213 A CN 105275213A CN 201410303606 A CN201410303606 A CN 201410303606A CN 105275213 A CN105275213 A CN 105275213A
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Abstract
The invention provides an eggshell-shaped unbounded prestress angle-changing tensioning construction method. The method comprises the steps of arranging bidirectional unbounded prestress tendons in the horizontal direction and the vertical direction of a digestion tank; designing an original annular prestress tendon rebar support into S-shaped prestress tendons, each having one end arranged on an outer side vertical rebar through spot welding and the other end provided with a groove used for lifting up one prestress rebar; employing the process of circular two-times over-tensioning of a single tendon, using jacks and tensioning oil pumps to synchronously tension four tensioning ends arranged in each layer of annular prestress tendons and then performing anchoring, wherein the first tensioning reaches 70% of control stress and the second tensioning reaches 1.03 times of the tensioning control stress; using angled wedge-shaped alloy steel cushion blocks to perform smooth shear conversion on steel strand bundles recessed in shell walls and realizing shell wall outside tensioning. The method is convenient to implement and low in cost and solves the problem of the difficulty in deflection tensioning in grooves. After the prestress of tensioning grooves is finished, the joints between the tensioning grooves and the surface of the tank body are smooth without bumps through anchor sealing.
Description
Technical field
The present invention relates to cast-in-situ concrete construction technical field, be specifically related to a kind of eggshell shape prestressing without bondn angle-changing extension construction method.
Background technology
Sludge digestion tank mainly contains toroidal and eggshell shape, and eggshell shape digester is a new technology of recent year municipal sludge process, and its planform is unique.Presstressed reinforcing steel plays an important role in egg shell construction, and it by prestressed stretch-draw, forms compressive pre-stress on the one hand in Quan, anti-only Quan cracking; Prestressed reinforcement is also the main steel bar stress of structure on the other hand, is effective guarantee that structural strength is met design requirement.
Be generally group anchor whole bundle angle-changing extension construction technology for eggshell shape digester binding prestress stretch-draw design, this construction technology difficulty is large, and process costs is higher.
In order to reduce difficulty of construction, through testing and verification before construction, work out and group's anchor entire beam tension is changed to single tendon stretch, this is conducive to greatly improving stretch-draw effect, adopt " single circulation twice ultra stretching " construction technology, the problem of groove intrinsic deflection stretch-draw difficulty can be solved.
Summary of the invention
Technical problem to be solved by this invention is the deficiency for above-mentioned existence, there is provided a kind of easy to operate, with low cost, solve the problem of groove intrinsic deflection stretch-draw difficulty, stretch-draw groove is after prestressing force of having constructed, pass through sealing off and covering anchorage, make stretch-draw groove be connected smooth-going with surface, pond, do not have irregular eggshell shape prestressing without bondn angle-changing extension construction method.
The technical solution adopted for the present invention to solve the technical problems is:
Eggshell shape prestressing without bondn angle-changing extension construction method, is characterized in that, include following construction sequence:
Two-way unbonded prestressing tendon is all arranged in digester level and vertical direction;
Former ring orientation prestress rib Steel bar rack is designed to S shape presstressed reinforcing steel support, one end points is welded on the vertical reinforcement of outside, and the groove of the other end is for holding up prestressed reinforcement;
Tensioning process: the technique adopting " single circulation twice ultra stretching ", ring orientation prestress rib every layer is provided with four stretching ends, and four ends adopt jack to coordinate stretching oil pump synchronous tension, and first time is stretched to 70% of proof stress, second time is stretched to the control stress for prestressing of 1.03 times, then anchoring; Vertical prestressing bar adopts orthogonal four direction synchronous tension techniques in plane, also equally adopts twice circulation ultra stretching with hoop.
Prestressing force angle-changing extension construction technology technology: adopt the angled wedge alloy steel cushion block of band, the steel wire bundle be recessed in shell wall is carried out smooth shear conversion, transfer to the outer stretch-draw of shell wall, prestressed Path of Force Transfer is made not have component, namely by angulator, limiting plate, retainer plate, the conversion of anchor slab angle, realize at housing external by specification Shi Hanzhang.
Tension sequence: first time stretch-draw hoop odd number layer (as the HJ1 → HJ3 →...→ HJ103) from the bottom up → first time stretch-draw hoop even numbers layer → first time stretch-draw vertical prestressing bar → second time stretch-draw vertical prestressing bar from the bottom up → hoop of the second time stretch-draw from top to bottom odd number layer → hoop of second time stretch-draw from top to bottom even numbers layer.
In hoop stretching process, stretching end should use Walkie talkie to keep in touch, when one end starts stretch-draw, the other end someone should observe the situation of change of Partner anchor clipper, as found intermediate plate slippage, whole stretch-draw should be suspended, after waiting the other end to adjust the tensioning equipment such as angulator, stretch-draw jack, then start four end synchronous tensions together.Every root presstressed reinforcing steel is numbered sequentially, and records stretch value by number.
Adopt stress control method, check the stretch value of unbonded prestressing tendon simultaneously, when being greater than or less than 6% of calculated extension value as actual elongation value, should stretch-draw being stopped, ascertaining the reason, after taking measures to be adjusted, can stretch-draw be continued.
In such scheme, described unbonded prestressing tendon arranges two bundle ring orientation prestress ribs along structure outward flange hoop in the horizontal direction, and four anchored end of ring orientation prestress rib intermesh overlap joint, and lap length is 1300 ~ 1600mm; The presstressed reinforcing steel of vertical direction is C30, more than 6.800m concrete label along the digester border following concrete label of layout digester absolute altitude 6.800m is C45, and concrete seepage-resistant grade is P10.
In such scheme, described ring orientation prestress rib is by manually penetrating in pool wall cage of reinforcement; Overlap a plastic flexible pipe outward again at ring orientation prestress rib sheath before wearing muscle, after ring orientation prestress rib laying is in place, plastic pipe is released, then with Plastic Bandage, ring orientation prestress rib is fixed on Steel bar rack; After vertical prestressing bar installs, overlap a plastic flexible pipe outward again, along with the rising of construction section, constantly moved up by plastic flexible pipe at vertical prestressing bar, protection vertical prestressing bar outer protective sleeve is not damaged; The prestress wire of vertical direction is arranged along digester border, and bottom is P type anchored end, and top is stretching end.
In such scheme, the installation steps of described anchor slab are, make groove shapes be fixed on outboard template with wooden form, hole on wooden form by the prestressed position of working drawing regulation, adopt nail to be fixed on wooden form by anchor slab; To ensure during installation the tangent line of presstressed reinforcing steel end and anchor slab perpendicular, wooden form formed groove planted agent filled and process or other material, in case concrete or mortar enter, anchor slab end and presstressed reinforcing steel intersection adopt foaming agent to fill, and prevent concrete from entering in anchor slab.
In such scheme, described tensioning process adopts following control program: initial tensioning 0 → 20% δ
k(amount initial value) → 40% δ
k→ 70% δ
k(amount stretch value, anchoring) → mend stretch-draw 0 → 70% δ
k(amount initial value) → 100% δ
k→ 103% δ
k(holding lotus 2 minutes, amount stretch value, anchoring).
Technical advantage of the present invention is:
By former ring orientation prestress rib Steel bar rack optimal design shape in "S" shape, spot welding, on the vertical reinforcement of outside, is saved a large amount of support reinforcing bars, is reduced construction cost.Adopt plastic pipe to presstressed reinforcing steel outsourcing protection when wearing muscle, avoid presstressed reinforcing steel and damage, cause added cost.Adopt " single circulation twice ultra stretching " construction technology, solve the problem of groove intrinsic deflection stretch-draw difficulty.Namely improve tensioning speed, shorten the duration, again save equipment cost expense.
Accompanying drawing explanation
Fig. 1 is the structural profile schematic diagram of embodiment of the present invention digester
Fig. 2 is embodiment of the present invention ring orientation prestress Steel bar rack schematic diagram
Fig. 3 embodiment of the present invention hoop four end synchronously deflects stretch-draw signal
Fig. 4 embodiment of the present invention angle-changing extension schematic diagram
1-ring orientation prestress rib in figure, 2-eggshell structural walls, 3-stretch-draw jack, 4-S shape presstressed reinforcing steel support, 5-outside vertical reinforcement, 6-former ring orientation prestress rib support, 7-angulator, 8-limiting plate, 9-retainer plate, 10-stretching end instrument ground tackle and anchor slab, 11-stretching end work ground tackle and anchor slab, 12-fixed end work ground tackle and anchor slab, 13-lengthen cylinder
14-vertical prestressing bar.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further illustrated:
Eggshell shape prestressing without bondn angle-changing extension construction method as shown in Fig. 1 Fig. 2 Fig. 3 Fig. 4, includes following construction sequence:
Digester eggshell structural walls 2 level and vertical direction are furnished with two-way unbonded prestressing tendon.The following concrete label of digester absolute altitude 6.800m is C30, more than 6.800m concrete label is C45, and concrete seepage-resistant grade is P10.
Former ring orientation prestress rib Steel bar rack 6 optimal design become S shape presstressed reinforcing steel support 4, S shape presstressed reinforcing steel support 4 to make one end spot welding of S shape on outside vertical reinforcement 5 with Φ 10 garden steel, other end groove is for holding up ring orientation prestress rib 1.
Ring orientation prestress rib 1 is by manually penetrating in pool wall cage of reinforcement.Overlap a plastic flexible pipe outward again at ring orientation prestress rib 1 sheath before wearing muscle, ring orientation prestress rib 1 lay in place after, plastic pipe is released, then with Plastic Bandage, ring orientation prestress rib 1 is fixed on S shape presstressed reinforcing steel support 4; After vertical prestressing bar 14 installs, overlap the plastic flexible pipe of 4 meters long at vertical prestressing bar 14 outward again, along with the rising of construction section, constantly moved up by plastic flexible pipe, protection vertical prestressing bar 14 outer protective sleeve is not impaired.The presstressed reinforcing steel of vertical direction is arranged along digester border, and bottom is P type anchored end, and top is stretching end.
The installation of anchor slab: make groove shapes with wooden form and be fixed on outboard template, holes on wooden form by the prestressed position of working drawing regulation, adopts nail to be fixed on wooden form by anchor slab.To ensure during installation the tangent line of presstressed reinforcing steel end and anchor slab perpendicular, wooden form formed groove planted agent filled and process or other material, in case concrete or mortar enter, anchor slab end and presstressed reinforcing steel intersection adopt foaming agent to fill, and prevent concrete from entering in anchor slab.
Tensioning process: the technique adopting " single circulation twice ultra stretching ".Ring orientation prestress rib 1 every layer of four end adopt 270KN stretch-draw jack 3 to coordinate stretching oil pump synchronous tension, and first time is stretched to 70% of proof stress, and second time is stretched to the control stress for prestressing of 1.03 times, then anchoring.Vertical prestressing bar adopts orthogonal four direction synchronous tension techniques in plane, also equally adopts twice circulation ultra stretching with hoop.
Prestressing force angle-changing extension construction technology technology: angle-changing extension technology is according to prestressing force loading characteristic, because of by the space constraint of structure appearance and modeling, when stretch-draw mouth can not be arranged on the external direct stretch-draw of structure, the space transforming technology taked.Adopt the angled wedge alloy steel cushion block of band, the steel wire bundle be recessed in shell wall is carried out smooth shear conversion, transfer to the outer stretch-draw of shell wall, prestressed Path of Force Transfer is made not have component, namely carrying out angle conversion by lengthening cylinder 13, angulator 7, limiting plate 8, retainer plate 9, stretching end instrument ground tackle and anchor slab 10, stretching end work ground tackle and anchor slab 11, fixed end work ground tackle and anchor slab 12, realizing at housing external by specification Shi Hanzhang.
Tension sequence: first time stretch-draw hoop odd number layer (as the HJ1 → HJ3 →...→ HJ103) from the bottom up → first time stretch-draw hoop even numbers layer → first time stretch-draw vertical prestressing bar → second time stretch-draw vertical prestressing bar from the bottom up → hoop of the second time stretch-draw from top to bottom odd number layer → hoop of second time stretch-draw from top to bottom even numbers layer.
Cable tensios control program: initial tensioning 0 → 20% δ
k(amount initial value) → 40% δ
k→ 70% δ
k→ (amount stretch value, anchoring), mends stretch-draw 0 → 70% δ
k(amount initial value) → 100% δ
k→ 103% δ
k(holding lotus 2 minutes, amount stretch value, anchoring).
In hoop stretching process, stretching end should use Walkie talkie to keep in touch, when one end starts stretch-draw, the other end someone should observe the situation of change of Partner anchor clipper, as found intermediate plate slippage, whole stretch-draw should be suspended, after waiting the other end to adjust the tensioning equipment such as angulator 7, stretch-draw jack 3, then start four end synchronous tensions together.Every root presstressed reinforcing steel is numbered sequentially, and records stretch value by number.
Adopt stress control method, check the stretch value of unbonded prestressing tendon simultaneously, when being greater than or less than 6% of calculated extension value as actual elongation value, should stretch-draw being stopped, ascertaining the reason, after taking measures to be adjusted, can stretch-draw be continued.
More than illustrate and be only Application Example of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalence change that the present patent application the scope of the claims is done, still belong to protection scope of the present invention.
Claims (4)
1. eggshell shape prestressing without bondn angle-changing extension construction method, is characterized in that, includes following construction sequence:
Two-way unbonded prestressing tendon is all arranged in digester level and vertical direction;
Former ring orientation prestress rib Steel bar rack is designed to S shape presstressed reinforcing steel support, one end points is welded on the vertical reinforcement of outside, and the groove of the other end is for holding up prestressed reinforcement;
Tensioning process: the technique adopting " single circulation twice ultra stretching ", ring orientation prestress rib every layer is provided with four stretching ends, and four ends adopt jack to coordinate stretching oil pump synchronous tension, and first time is stretched to 70% of proof stress, second time is stretched to the control stress for prestressing of 1.03 times, then anchoring; Vertical prestressing bar adopts orthogonal four direction synchronous tension techniques in plane, also equally adopts twice circulation ultra stretching with hoop;
Prestressing force angle-changing extension construction technology technology: adopt the angled wedge alloy steel cushion block of band, the steel wire bundle be recessed in shell wall is carried out smooth shear conversion, transfer to the outer stretch-draw of shell wall, prestressed Path of Force Transfer is made not have component, namely by angulator, limiting plate, retainer plate, the conversion of anchor slab angle, realize at housing external by specification Shi Hanzhang;
Tension sequence: the first time stretch-draw hoop odd number layer from the bottom up → first time stretch-draw hoop even numbers layer → first time stretch-draw vertical prestressing bar → second time stretch-draw vertical prestressing bar from the bottom up → hoop of the second time stretch-draw from top to bottom odd number layer → hoop of second time stretch-draw from top to bottom even numbers layer;
In hoop stretching process, stretching end should use Walkie talkie to keep in touch, when one end starts stretch-draw, the other end someone should observe the situation of change of Partner anchor clipper, as found intermediate plate slippage, whole stretch-draw should be suspended, after waiting the other end to adjust the tensioning equipment such as angulator, stretch-draw jack, then start four end synchronous tensions together;
Every root presstressed reinforcing steel is numbered sequentially, and records stretch value by number;
Adopt stress control method, check the stretch value of unbonded prestressing tendon simultaneously, when being greater than or less than 6% of calculated extension value as actual elongation value, should stretch-draw being stopped, ascertaining the reason, after taking measures to be adjusted, can stretch-draw be continued.
2. eggshell shape prestressing without bondn angle-changing extension construction method as claimed in claim 1, it is characterized in that, described unbonded prestressing tendon arranges two bundle ring orientation prestress ribs along structure outward flange hoop in the horizontal direction, four anchored end of ring orientation prestress rib intermesh overlap joint, and lap length is 1300 ~ 1600mm; The presstressed reinforcing steel of vertical direction is C30, more than 6.800m concrete label along the digester border following concrete label of layout digester absolute altitude 6.800m is C45, and concrete seepage-resistant grade is P10.
3. eggshell shape prestressing without bondn angle-changing extension construction method as claimed in claim 1, it is characterized in that, described ring orientation prestress rib is by manually penetrating in pool wall cage of reinforcement; Overlap a plastic flexible pipe outward again at ring orientation prestress rib sheath before wearing muscle, after ring orientation prestress rib laying is in place, plastic pipe is released, then with Plastic Bandage, ring orientation prestress rib is fixed on Steel bar rack; After vertical prestressing bar installs, overlap a plastic flexible pipe outward again, along with the rising of construction section, constantly moved up by plastic flexible pipe at vertical prestressing bar, protection vertical prestressing bar outer protective sleeve is not damaged; The prestress wire of vertical direction is arranged along digester border, and bottom is P type anchored end, and top is stretching end.
4. eggshell shape prestressing without bondn angle-changing extension construction method as claimed in claim 1, it is characterized in that, the installation steps of described anchor slab are, making groove shapes with wooden form is fixed on outboard template, hole on wooden form by the prestressed position of working drawing regulation, adopt nail to be fixed on wooden form by anchor slab; To ensure during installation the tangent line of presstressed reinforcing steel end and anchor slab perpendicular, wooden form formed groove planted agent filled and process or other material, in case concrete or mortar enter, anchor slab end and presstressed reinforcing steel intersection adopt foaming agent to fill, and prevent concrete from entering in anchor slab.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410303606.2A CN105275213A (en) | 2014-06-30 | 2014-06-30 | An eggshell-shaped unbounded prestress angle-changing tensioning construction method |
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| CN201410303606.2A CN105275213A (en) | 2014-06-30 | 2014-06-30 | An eggshell-shaped unbounded prestress angle-changing tensioning construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107419833A (en) * | 2016-06-24 | 2017-12-01 | 中建六局建设发展有限公司 | A kind of annular two-way double helix prestressing without bondn cored slab track construction method |
| CN112663774A (en) * | 2021-01-18 | 2021-04-16 | 中铁八局集团有限公司 | Construction method of unbonded prestressed large-diameter reinforced concrete thin-wall circular water tank |
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| JP2001200652A (en) * | 2000-01-17 | 2001-07-27 | Ps Corp | Prestressing method for egg-shaped concrete vessel structure |
| CN1480595A (en) * | 2003-07-21 | 2004-03-10 | 上海市政工程设计研究院 | Egg-shaped digestion tank and its construction method |
| US20100284749A1 (en) * | 2007-11-13 | 2010-11-11 | Capron Mark E | Systems and methods for off-shore energy production and carbon dioxide sequestration |
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2014
- 2014-06-30 CN CN201410303606.2A patent/CN105275213A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001200652A (en) * | 2000-01-17 | 2001-07-27 | Ps Corp | Prestressing method for egg-shaped concrete vessel structure |
| CN1480595A (en) * | 2003-07-21 | 2004-03-10 | 上海市政工程设计研究院 | Egg-shaped digestion tank and its construction method |
| US20100284749A1 (en) * | 2007-11-13 | 2010-11-11 | Capron Mark E | Systems and methods for off-shore energy production and carbon dioxide sequestration |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107419833A (en) * | 2016-06-24 | 2017-12-01 | 中建六局建设发展有限公司 | A kind of annular two-way double helix prestressing without bondn cored slab track construction method |
| CN112663774A (en) * | 2021-01-18 | 2021-04-16 | 中铁八局集团有限公司 | Construction method of unbonded prestressed large-diameter reinforced concrete thin-wall circular water tank |
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Application publication date: 20160127 |