CN101307595A - Large-sized aqueduct prestressing force construction method - Google Patents
Large-sized aqueduct prestressing force construction method Download PDFInfo
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- CN101307595A CN101307595A CNA2008100483849A CN200810048384A CN101307595A CN 101307595 A CN101307595 A CN 101307595A CN A2008100483849 A CNA2008100483849 A CN A2008100483849A CN 200810048384 A CN200810048384 A CN 200810048384A CN 101307595 A CN101307595 A CN 101307595A
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Abstract
The invention relates to a prestress construction method for a large-scale aqueduct, belonging to the aqueduct construction technical field. The method mainly completes the prestress construction of the aqueduct by the following steps of colligation of a steel disc, assembly of a corrugated pipe, assembly of a stretching end anchor pallet, assembly of a fixed end p-type anchor device, clustering of steel strands, primary concrete placement and secondary concrete placement, and techniques such as stretching, channel grouting and so on. The method adopts the construction techniques such as three-dimensional arrangement of prestressing tendons, pretightening of a single tendon, staged stretching, anchor seal through a protective cover, vacuum auxiliary grouting and so on, shortens the construction period and reduces the production cost.
Description
Technical field
The present invention relates to a kind of aqueduct prestressing force construction method.
Background technology
Aqueduct is a kind of device of transporting water, in artificial water delivery process, if water must be provided with aqueduct through low-lying land.Aqueduct in the past mostly is single groove, and single groove can't satisfy the requirement of a large amount of water deliverys, so the conveying of adopting multiple-grooved to finish big water gaging more.The groove body is because the cross section is big, and apart from the ground height, the single span groove is from great, and it is big to carry out difficulty of construction with existing method, and the duration is longer, the cost height.
Summary of the invention
The objective of the invention is to provide a kind of short construction period, the aqueduct prestressing force construction method that cost is low.
The object of the present invention is achieved like this: a kind of large-sized aqueduct prestressing force construction method,
Steel disk colligation: spacer screen reinforcing bar and lateral reinforcement colligation are carried out colligation;
Bellows is installed: bellows is installed when treating that spacer screen reinforcing bar and lateral reinforcement colligation are installed after good, with handling reinforcement bellows is fixed on the stirrup, and controls position, the left and right sides handling reinforcement and the stirrup of bellows well and weld;
Stretch-draw end anchor plate is installed: behind the bellows installation in position, the neck of anchor plate is enclosed within on the bellows, lap-joint's outer rim tightly wraps with adhesive plaster, and with the stone dead wire colligation on the mooring anchor backing plate, before installation, spiral bar should be inserted in, after ground tackle is installed, spiral bar is close to anchor plate and is fixed on the reinforcing bar, and the duct port of export of anchor plate must be vertical with the bellows core line, and the inclination angle of its end face must adhere to specification, after the end face template is stood well, anchor plate is fixed on the template with screw rod;
Fixed end p type ground tackle is installed: select for use the extruding anchor to add bearing plate and fix, steel strand are penetrated in the bellows, be inserted in the length of confinement ring, spiral bar, anchor slab, front end reservation 1.5m successively from an end, after being anchored on the steel strand with extruder extruded sleeve again, with extruded sleeve and anchor slab jam-packed, load onto bearing plate and tighten with screw, whole bundle is put into the position during location, accurately locatees by the coordinate requirement;
Steel strand lashing: after steel strand are finished bunchy, front end is wrapped up adhesive plaster, behind the bundle circle that the bellows front end is loaded onto, carry out lashing;
Stack is installed: install readyly when reserving also the bellows in road, in the appropriate location of bellows stack is set as required;
Carrying out one deck concrete respectively builds with two layers of concrete and builds:
Stretch-draw: when brick structure intensity reach design strength 80% the time can stretch-draw;
Duct grouting: stretch-draw finishes the duct, back and in time is in the milk.
Adopt single pretension during stretch-draw, the method for grading tension is carried out.
Adopt vacuum aid grouting to construct during duct grouting.
Large-sized aqueduct prestressing force construction method provided by the invention adopts the three dimensions presstressed reinforcing steel to arrange, single pretension, and grading tension, the protective cover sealing off and covering anchorage, construction technologies such as vacuum-assisted grouting have shortened construction period, have reduced cost of production.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a longitudinal prestressing strands schematic diagram of the present invention.
Fig. 2 is a longeron prestressing tendon schematic diagram among the present invention.
Fig. 3 is that the present invention analyses end rib prestressing tendon intention the horizontal end.
Fig. 4 is the present invention's two side bar vertical prestressing bundle schematic diagrames.
Stain is represented the ground tackle position among the figure, and the duct title represented in the letter in the square frame.
The specific embodiment
Implementation process of the present invention is as follows:
1, materials arrival: steel hinge line march into the arena check, unwrapping wire, roll off the production line, number; The making of fixed end ground tackle, bunchy, classification; Ground tackle check, warehouse-in, classification are placed; Bellows check, stacking.
2, bellows is installed: bellows is installed when treating that spacer screen reinforcing bar and lateral reinforcement colligation are installed after good, control coordinate dimension by section and rise that each duct coordinate on the drawing marks on template, measure allowable error ± 5mm, with handling reinforcement bellows is fixed on the stirrup, and control position, the left and right sides handling reinforcement of bellows and stirrup welding well, prevent skew of bellows position or come-up.The bellows spreading adopts special-purpose corrugated pipe connector in the installation, tightly wraps with the sealing adhesive plaster in lap-joint's outer rim.
3, stretch-draw end anchor plate is installed: behind the bellows installation in position, the neck of anchor plate is enclosed within on the bellows, the lap length of bellows and anchor plate must not be less than 30mm.Lap-joint's outer rim tightly wraps with adhesive plaster, and with the stone dead wire colligation on the mooring anchor backing plate, before installation, spiral bar should be inserted in.After ground tackle was installed, spiral bar was close to anchor plate and is fixed on the reinforcing bar, and the duct port of export of anchor plate must be vertical with the bellows core line, and the inclination angle of its end face must adhere to specification.Should under the works top layer, press design drawing for following horizontal stretch-draw end and reserve conical socket.After the end face template is stood well, anchor plate is fixed on the template with screw rod.
4, fixed end p type ground tackle is installed: the back is selected for use the extruding anchor to add bearing plate and is fixed according to on-site actual situations.Way is that steel strand are penetrated in the bellows, is inserted in the length that confinement ring, spiral bar, anchor slab, front end are reserved 1.5m successively from an end, be anchored at steel strand on extruder extruded sleeve again after, with extruded sleeve and anchor slab jam-packed, load onto bearing plate and tighten with screw.Whole bundle is put into the position during location, accurately locatees by the coordinate requirement.
5, reserving hole channel protection: after the bellows colligation was in place, other operation should be very careful.Care should be used to operation in the reinforcing bar binding process.Protection is as reserving hole channel position shape and outward appearance meticulously.When electrogas welding is operated, forbid electric spark to touch bellows and adhesive tape, welding slag must not be piled and drop on bellows surface.
6, steel strand lashing: after steel strand are finished bunchy, front end is wrapped up adhesive plaster, destroy bellows when avoiding lashing, also be convenient to lashing simultaneously.Bundle circle in that the bellows front end is loaded onto manually carries out lashing with the strand pulling machine combination then, should prevent in the steel strand lashing that steel strand from reversing, and notes the sign up and down of steel bundle end.
7, stack is installed: install readyly when the bellows of reserving hole channel, in the appropriate location of bellows stack is set as required, its setting principle is: the reserving hole channel length of (1) wire harness should be provided with a stack in the centre during greater than 30m.(2) the reservation road of pencil of curves then must be provided with stack at the crest place if any last arch structure.(3) stack requires to pass to the prestressed concrete upper surface and expose more than the 300mm, compiles number in the outer end, cements with adhesive plaster, tightly wraps with the sealing adhesive plaster between stack and the ripple.
8, one deck silicon is built: review rise is installed before the envelope mould: before opening a position bellows is examined the distant and out of sight breakage that whether has, carry out hidden operation and check and accept.Strengthen in building the vibrating of anchor plate position guaranteed vibration compacting, and be strictly on guard against that spillage is in anchor plate.
9, two layers of brick are built: have or not breakage to make emphasis inspection apricot to the interface corrugated tube before building, can build after the acceptance(check).
10, stretch-draw: when brick structure intensity reach design strength 80% the time can stretch-draw.
1) apply prestressing force preceding reply jack and oil meter and carry out supporting verification, its manometric precision is in ± 2% scope.
2) during stretch-draw based on Stress Control, stretch value is as verification: (± 6%) must suspend stretch-draw when theoretical value and measured value surpass the design code scope, analyzes reason, can continue Ex post.
3) tension sequence: at the tension sequence of arrangement in principle synchronous, symmetrical, simultaneously, total order is vertically to arrive earlier laterally to arrive vertically again, advances to the centre from both sides again.
4) stretch-draw step: steel bundle stretching control force is δ con=0.7 * fPtkMpa, divides four step stretch-draw;
First step stress is by the single pretension stretch-draw of 0-15% δ con;
The second step stress can carry out the second step stretch-draw after holding lotus 5min by 15%-30% δ con;
The 3rd step stress is by 30%-60% δ con;
The 4th step stress keeps 103% δ con not put by 60%-103% δ con, locks after holding lotus 2min.
11, duct grouting: stretch-draw finishes the duct, back in time is in the milk, and this engineering design requires to adopt the vacuum aid grouting skill of constructing.
1) equipment is prepared and meter calibration: to mudjack, the pressure meter that vacuum pump uses is demarcated.
2) seal for pipe joints and pressure anchor: after stretch-draw is finished, in the designing requirement scope, can excise steel strand through the checking computations stretch value, the ground tackle end leaves 3 centimetres of left and right sides length, rolls into a ball sealing off and covering anchorage with moistening cement.
3) duct mediation: the ponding in the employing high-pressure blast will be managed before the dress anchor clamp dries up, and can carry out next step operation after impurity is cleaned out.
4) conduit connects: an end is installed vacuum-pumping tube, and an end is installed grout pipe, opens the vacuum pump mud jacking, and reaches-0.06 to-0.09MPa vacuum requirement.
5) the cement paste strictness is stirred pulping by proportioning: open inlet pipe valve and mud jacking, cement paste to be found is closed the outlet pipe ball valve after entering and exposing vacuum-pumping tube, is forced into 0.5-0.8MPa, to vertical duct mud jacking from bottom to top, pressurized control is at 0.3-0.4MPa, and all wants voltage stabilizing 2 minutes.
6) will open and close steam vent successively to the pipeline slurry process that a plurality of crests are arranged, grouting should slowly evenly be carried out, and must not interrupt.
Claims (3)
1, a kind of large-sized aqueduct prestressing force construction method is characterized in that:
Steel disk colligation: spacer screen reinforcing bar and lateral reinforcement colligation are carried out colligation;
Bellows is installed: bellows is installed when treating that spacer screen reinforcing bar and lateral reinforcement colligation are installed after good, with handling reinforcement bellows is fixed on the stirrup, and controls position, the left and right sides handling reinforcement and the stirrup of bellows well and weld;
Stretch-draw end anchor plate is installed: behind the bellows installation in position, the neck of anchor plate is enclosed within on the bellows, lap-joint's outer rim tightly wraps with adhesive plaster, and with the stone dead wire colligation on the mooring anchor backing plate, before installation, spiral bar should be inserted in, after ground tackle is installed, spiral bar is close to anchor plate and is fixed on the reinforcing bar, and the duct port of export of anchor plate must be vertical with the bellows core line, and the inclination angle of its end face must adhere to specification, after the end face template is stood well, anchor plate is fixed on the template with screw rod;
Fixed end p type ground tackle is installed: select for use the extruding anchor to add bearing plate and fix, steel strand are penetrated in the bellows, be inserted in the length of confinement ring, spiral bar, anchor slab, front end reservation 1.5m successively from an end, after being anchored on the steel strand with extruder extruded sleeve again, with extruded sleeve and anchor slab jam-packed, load onto bearing plate and tighten with screw, whole bundle is put into the position during location, accurately locatees by the coordinate requirement;
Steel strand lashing: after steel strand are finished bunchy, front end is wrapped up adhesive plaster, behind the bundle circle that the bellows front end is loaded onto, carry out lashing;
Stack is installed: install readyly when reserving also the bellows in road, in the appropriate location of bellows stack is set as required;
Carrying out one deck concrete respectively builds with two layers of concrete and builds:
Stretch-draw: when brick structure intensity reach design strength 80% the time can stretch-draw;
Duct grouting: stretch-draw finishes the duct, back and in time is in the milk.
2, large-sized aqueduct prestressing force construction method according to claim 1 is characterized in that: adopt single pretension during stretch-draw, the method for grading tension is carried out.
3, large-sized aqueduct prestressing force construction method according to claim 1 is characterized in that: adopt vacuum aid grouting to construct during duct grouting.
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| CNA2008100483849A CN101307595A (en) | 2008-07-09 | 2008-07-09 | Large-sized aqueduct prestressing force construction method |
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| CNA2008100483849A CN101307595A (en) | 2008-07-09 | 2008-07-09 | Large-sized aqueduct prestressing force construction method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101797728A (en) * | 2009-12-14 | 2010-08-11 | 大连船舶重工集团有限公司 | Anchor plate positioning template device for liquefied natural gas (LNG) ship liquid tank containment system |
| CN101596744B (en) * | 2009-07-06 | 2011-05-11 | 中冶建工有限公司 | Method for binding and mounting continuous stirrups of post-tensioned prestressed reinforced concrete box girder |
| CN102086701A (en) * | 2010-12-23 | 2011-06-08 | 葛洲坝集团第一工程有限公司 | Prestressed tensioning construction method |
| CN103898876A (en) * | 2014-04-09 | 2014-07-02 | 安徽水安建设集团股份有限公司 | Reinforced concrete U-shaped aqueduct casting template without counter bolts |
| CN104195988A (en) * | 2014-09-16 | 2014-12-10 | 葛洲坝集团第一工程有限公司 | Concrete vibrating method for large-span U-shaped thin-wall aqueduct |
| CN104195958A (en) * | 2014-09-16 | 2014-12-10 | 葛洲坝集团第一工程有限公司 | Aqueduct making machine via hole protecting device and method for aqueduct side wall top plate |
| CN104846788A (en) * | 2015-04-27 | 2015-08-19 | 吉林省翔宇建筑工程有限公司长春分公司 | Method for modifying small-span concrete aqueduct into large-span cable-stayed structure |
| CN104878729A (en) * | 2015-04-27 | 2015-09-02 | 吉林省银河水利水电新技术设计有限公司 | Method for adopting opposite-direction bilayer prestressed steel structure bracket to modify aqueduct body structure |
| CN105648987A (en) * | 2016-03-23 | 2016-06-08 | 河南省水利勘测设计研究有限公司 | Bidirectional pre-stress U-shaped aqueduct corrugated pipe positioning mesh structure |
| CN105780735A (en) * | 2016-03-23 | 2016-07-20 | 河南省水利勘测设计研究有限公司 | Positioning method of two-way prestressed U-shaped aqueduct bellows hole channel |
| CN109371914A (en) * | 2018-12-25 | 2019-02-22 | 中国电建集团成都勘测设计研究院有限公司 | A kind of discharge channel structure convenient for later period reconstruction |
| CN110485260A (en) * | 2019-09-12 | 2019-11-22 | 蓝海建设集团有限公司 | A kind of construction method of aqueduct |
| CN111535193A (en) * | 2020-05-12 | 2020-08-14 | 温州宏源水电建设有限公司 | Aqueduct prestressing force arc stretch-draw structure |
| CN112629782A (en) * | 2020-12-30 | 2021-04-09 | 中国工程物理研究院激光聚变研究中心 | Self-sealing type vacuum detection system and vacuumizing leak detection method |
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2008
- 2008-07-09 CN CNA2008100483849A patent/CN101307595A/en active Pending
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101596744B (en) * | 2009-07-06 | 2011-05-11 | 中冶建工有限公司 | Method for binding and mounting continuous stirrups of post-tensioned prestressed reinforced concrete box girder |
| CN101797728B (en) * | 2009-12-14 | 2012-12-12 | 大连船舶重工集团有限公司 | Anchor plate positioning template device for liquefied natural gas (LNG) ship liquid tank containment system |
| CN101797728A (en) * | 2009-12-14 | 2010-08-11 | 大连船舶重工集团有限公司 | Anchor plate positioning template device for liquefied natural gas (LNG) ship liquid tank containment system |
| CN102086701A (en) * | 2010-12-23 | 2011-06-08 | 葛洲坝集团第一工程有限公司 | Prestressed tensioning construction method |
| CN103898876B (en) * | 2014-04-09 | 2015-02-18 | 安徽水安建设集团股份有限公司 | Method for manufacturing reinforced concrete U-shaped aqueduct casting template without counter bolts |
| CN103898876A (en) * | 2014-04-09 | 2014-07-02 | 安徽水安建设集团股份有限公司 | Reinforced concrete U-shaped aqueduct casting template without counter bolts |
| CN104195958B (en) * | 2014-09-16 | 2016-05-04 | 葛洲坝集团第一工程有限公司 | The guard method of aqueduct side wall top board Channel Maker via hole |
| CN104195988A (en) * | 2014-09-16 | 2014-12-10 | 葛洲坝集团第一工程有限公司 | Concrete vibrating method for large-span U-shaped thin-wall aqueduct |
| CN104195988B (en) * | 2014-09-16 | 2016-10-19 | 中国葛洲坝集团第一工程有限公司 | A kind of large span U-shaped thin wall slot concrete vibrating method |
| CN104195958A (en) * | 2014-09-16 | 2014-12-10 | 葛洲坝集团第一工程有限公司 | Aqueduct making machine via hole protecting device and method for aqueduct side wall top plate |
| CN104846788B (en) * | 2015-04-27 | 2016-09-07 | 吉林省翔宇建筑工程有限公司长春分公司 | A kind of method that little span concrete flume is modified as large span slant-pull structure |
| CN104878729A (en) * | 2015-04-27 | 2015-09-02 | 吉林省银河水利水电新技术设计有限公司 | Method for adopting opposite-direction bilayer prestressed steel structure bracket to modify aqueduct body structure |
| CN104878729B (en) * | 2015-04-27 | 2016-09-14 | 吉林省银河水利水电新技术设计有限公司 | Use the method that incorgruous double-layer prestressed steel construction bracket carries out groove body structure transformation |
| CN104846788A (en) * | 2015-04-27 | 2015-08-19 | 吉林省翔宇建筑工程有限公司长春分公司 | Method for modifying small-span concrete aqueduct into large-span cable-stayed structure |
| CN105648987A (en) * | 2016-03-23 | 2016-06-08 | 河南省水利勘测设计研究有限公司 | Bidirectional pre-stress U-shaped aqueduct corrugated pipe positioning mesh structure |
| CN105780735A (en) * | 2016-03-23 | 2016-07-20 | 河南省水利勘测设计研究有限公司 | Positioning method of two-way prestressed U-shaped aqueduct bellows hole channel |
| CN109371914A (en) * | 2018-12-25 | 2019-02-22 | 中国电建集团成都勘测设计研究院有限公司 | A kind of discharge channel structure convenient for later period reconstruction |
| CN109371914B (en) * | 2018-12-25 | 2023-09-26 | 中国电建集团成都勘测设计研究院有限公司 | Drain channel structure convenient to later stage rebuild |
| CN110485260A (en) * | 2019-09-12 | 2019-11-22 | 蓝海建设集团有限公司 | A kind of construction method of aqueduct |
| CN110485260B (en) * | 2019-09-12 | 2020-11-24 | 蓝海建设集团有限公司 | Construction method of aqueduct |
| CN111535193A (en) * | 2020-05-12 | 2020-08-14 | 温州宏源水电建设有限公司 | Aqueduct prestressing force arc stretch-draw structure |
| CN112629782A (en) * | 2020-12-30 | 2021-04-09 | 中国工程物理研究院激光聚变研究中心 | Self-sealing type vacuum detection system and vacuumizing leak detection method |
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Open date: 20081119 |