CN106522561B - Stretch-draw construction method in large-span concrete Vierendeel girder bonded prestress post-cast strip - Google Patents

Stretch-draw construction method in large-span concrete Vierendeel girder bonded prestress post-cast strip Download PDF

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Publication number
CN106522561B
CN106522561B CN201610944762.6A CN201610944762A CN106522561B CN 106522561 B CN106522561 B CN 106522561B CN 201610944762 A CN201610944762 A CN 201610944762A CN 106522561 B CN106522561 B CN 106522561B
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tensioning
con
bellows
concrete
reinforcing steel
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CN201610944762.6A
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Chinese (zh)
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CN106522561A (en
Inventor
熊新光
卫千峰
李昌强
于相平
全有维
程建军
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中建八局第三建设有限公司
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12Mounting of reinforcing inserts; Prestressing

Abstract

The invention discloses stretch-draw construction methods in large-span concrete Vierendeel girder bonded prestress post-cast strip, including the installation of branch beam bottom board and nonprestressed reinforcement binding, welding presstressed reinforcing steel bracket, bellows installation, presstressed reinforcing steel are worn, acceptance of concealed work, casting concrete, tension of prestressed tendon, duct grouting, stretching end sealing off and covering anchorage;It includes: that both ends or one end bellows wears → binds bellows supporting point → install spiral bar and P anchor plate → alter-pouring strips mould plate in stretching end and blocks that presstressed reinforcing steel, which is worn,.The present invention reduces structure hole to be provided, it is ensured that structural integrity using bonded prestressed beam construction method in post-cast strip;Using setting bonded prestress girder tensioning end in post-cast strip, it is ensured that design stress reduces the loss of stress, to ensure that the safety of structure.

Description

Stretch-draw construction method in large-span concrete Vierendeel girder bonded prestress post-cast strip
Technical field
The present invention relates to construction techniques, and in particular in large-span concrete Vierendeel girder bonded prestress post-cast strip Stretch-draw construction method.
Background technique
The setting construction of bonded prestressed beam stretching end generally uses haunch tensioning, goes out stretching end using haunched slab, it is ensured that Tension operation space, then using after stretching end reserve tensioning after pour hole carry out tensioning operation.
Reserved opening reinforcing bar is cut off first, carries out tension operation, after the completion of prestressed stretch-draw, grouting, sealing off and covering anchorage operation, Tensioning hole is poured after reserving again and carries out the rejecting of the slag inclusions such as template, the lumps of wood completely, and progress frame body is set up and formwork erection, bar list Face is cleaned out with brush cleaning, then is connect using joint welding is carried out with model reinforcing bar, with than former concrete after the completion of reinforcement installation The concrete of a high strength grade is poured, and carries out concrete curing work after the completion of pouring, reach after design strength again into The dismounting of row frame body template.
Do haunched slab tensioning, due to haunch be self-possessed it is larger, reserved after pour hole complex procedures, construction it is inconvenient and dangerous, Haunch tensioning angle is easy to produce the adverse effect such as stress loss.
Summary of the invention
Goal of the invention: in order to reduce the risks such as angle-changing extension bring stress loss, ultra stretching fracture of wire and it is reserved after pour hole The problems such as bring complex procedures, dangerous, leak, not whole appearance, the present invention, which provides a kind of large-span concrete Vierendeel girder, to be had Stretch-draw construction method in binding prestress post-cast strip, it is ensured that the construction quality of bonded prestressed beam tensioning.
Technical solution: stretching construction side in large-span concrete Vierendeel girder bonded prestress post-cast strip of the present invention Method, including the installation of branch beam bottom board and nonprestressed reinforcement binding, welding presstressed reinforcing steel bracket, bellows installation, presstressed reinforcing steel are worn If, acceptance of concealed work, casting concrete, tension of prestressed tendon, duct grouting, stretching end sealing off and covering anchorage;
Presstressed reinforcing steel wear include: both ends or one end bellows wear → bind bellows supporting point → stretching end install Spiral bar and P anchor plate → alter-pouring strips mould plate block, and wherein post-cast strip first uses foam concrete heat-preserving plate to be blocked, then adopts It is blocked with template item;
Tension of prestressed tendon:
(1) tension sequence: general sequence is sectional tensioning, to every section of prestressed frame beam in Vierendeel girder using sequence The mode of drawing carries out symmetrical tensioning from both sides to centre or from centre to both sides, and the mode of secondary beam, pretensioning are same after first girder The prestressing tendon in a direction;
(2) stretching process: tensioned at one end carries out tensioning in component one end using a jack, and both ends tensioning uses 2 Jack arrives the other end again after the completion of component both ends carry out tensioning or first tensioning at one end simultaneously and mends drawing, and component is to pour coagulation The concrete structure member that native step is formed;
(3) stressing sequence:
(31) presstressed reinforcing steel is straight line laying in beam: 0 → 10% ó of ó con → 100% con anchoring;
(32) presstressed reinforcing steel is that curve is laid and hole count is less than or equal to 9 holes in beam: 0 → 10% ó of ó con → 60% con → 100% ó con anchoring;
(33) presstressed reinforcing steel is curve laying and big 9 hole of hole count: 0 → 10% ó of ó con → 30% ó of con → 60% con in beam → 100% ó con anchoring.
Further, the both ends bellows presstressed reinforcing steel wears process: bunchy is from any one after steel wire bundle is opened End penetrates bellows, and guarantee penetrates the exposed steel strand wires equal length in rear both ends, it is ensured that stretching end working length is greater than 1m;One end Bellows presstressed reinforcing steel wears process: penetrating after being first arranged P anchor plate, spiral bar and constraint from fixing end bellows, fixing end Extruding anchor will be adjacent to P anchor plate.
Further, should check whether the position of bellows and P anchor plate is correct, and joint is before the casting concrete It is no secured;It when concrete enters mould, should avoid bellows by excessive impact as far as possible, shift and shrivel to prevent bellows;Coagulation Soil, which should be layered, to vibrate, and pays attention to vibration compacting;Concrete vibrator absolutely cannot direct vibration bellows;Production concrete examination in time Block, and the concrete test block for setting cured under same condition is stayed by job specfication requirement, to determine the tensioning time;Answered after concreting and When conserve, check and clear up duct, P anchor plate and grout hole.
Further improve above-mentioned technical proposal, the tension of prestressed tendon proof stress σcon=0.75fptk, i.e., 1395Mpa;When being stretched to whole pulling force, lotus 2min is held;The stretching force of every beam presstressed reinforcing steel is N=1.0 σconAs, As are tension The area of section of area longitudinal direction regular reinforcement;Elongation value of stretching should be from 0.1 σconWith 1.0 σcon, measure calculate in two times, and make scene Record;Oil pressure should slowly, steadily rise when tensioning;Actual elongation value and calculated extension value deviation should within+6%~-6%, Otherwise it should suspend tensioning, ascertain the reason and can continue tensioning after taking measures.
The utility model has the advantages that compared with prior art, advantages of the present invention: (1) using post-cast strip in bonded prestressed beam being applied Work method reduces structure hole to be provided, it is ensured that structural integrity;(2) using setting bonded prestressed beam in post-cast strip Pull end, it is ensured that design stress reduces the loss of stress, to ensure that the safety of structure;(3) due to using in post-cast strip Bonded prestress girder tensioning end is set, reduces covering anchorage operation, more effectively protects anchorage;Reduce the closure of reserved opening Process, so as to the construction of subsequent handling.
Detailed description of the invention
Fig. 1 is flow chart of the method for the present invention;
Fig. 2 is the structural schematic diagram of stretching end;
Fig. 3 is tensioning direction schematic diagram;
Fig. 4 is stretching process schematic diagram;
Fig. 5 is tension sequence schematic diagram.
Specific embodiment
Technical solution of the present invention is described in detail below by attached drawing.
Embodiment 1: tension construction technology in large-span concrete Vierendeel girder bonded prestress post-cast strip as shown in Figure 1 Process: presstressed reinforcing steel bracket is welded in the installation of branch beam bottom board and nonprestressed reinforcement binding, and bellows installation is reserved gas vent, filled Starch hole, installation fitting, presstressed reinforcing steel is worn in beam, binds nonprestressed reinforcement in plate, and hidden project inspection is checked and accepted, pour concrete and Maintenance, intensity reach 100%, and establishment tension sequence, tensioning equipment calibration, tension of prestressed tendon, duct grouting are cut off exposed pre- Stress rib simultaneously does protective treatment.
Concrete construction method is as follows:
(1) presstressed reinforcing steel lashing
After bellows is in place, tractor is installed according to drawing requirement, is penetrated by beam.Bunchy is from one after steel wire bundle is opened End penetrates bellows and is pierced by from the other end, and bellows is not stabbed when wearing muscle, the prestressing force of prestressed girder should be checked after lashing Arrangement of reinforcement must not be misdrawed;Both ends tensioned prestressing bar can penetrate bellows from any end, and guarantee to penetrate the exposed steel in rear both ends Twisted wire equal length, it is ensured that stretching end working length is greater than 1m;One-end tension presstressed reinforcing steel first package P anchor plate, spiral bar and It is penetrated again from fixing end bellows after constraint circle, fixing end extruding anchor will be adjacent to P anchor plate;It has worn bellows after presstressed reinforcing steel With iron wire binding and fixing at each supporting-point, and spiral bar and P anchor plate are installed in tensioning end position;P anchor plate must be consolidated It is fixed then to carry out the closure of alter-pouring strips mould plate to ensure that tensioning end position no longer moves, for the closure of alter-pouring strips mould plate carry out compared with High requirement, is blocked using foam concrete heat-preserving plate, then is blocked using template item, has both guaranteed that spillage does not make coagulation Soil is closely knit, and can guarantee that tensioning end surfaces are smooth in post-cast strip, and Fig. 2 is the operating space of stretching end.
(2) concrete is poured
After the completion of whole reinforcing bar layings, hidden inspection is carried out with designing unit by quality control division, supervisory board and is received, confirmation is closed It, can casting concrete after lattice;Reinforce vibrating when concreting and guarantee closely knit, does not occur honeycomb or hole;In concrete So that the position of presstressed reinforcing steel, bellows, spacer bar and backing plate is changed in process of vibrating, does not allow to be directly directed at ripple Pipe vibrates with P anchor plate;
1. should check whether the position of bellows and P anchor plate is correct, and whether joint is secured before casting concrete, find Problem should be handled in time.
It 2. concrete enters mould, should avoid bellows by excessive impact as far as possible, shift and shrivel to prevent bellows.
It vibrates 3. concrete should be layered, pays attention to vibration compacting, especially intensively locate more double to infuse in the end of beam and reinforcing bar Meaning.Concrete gravel partial size can suitably be reduced when necessary or other reasonable measures is taken to solve.
4. concrete vibrator absolutely cannot direct vibration bellows, cause bellows spillage so that vibrationproof is flat, influence tensioning And duct grouting.
5. production concrete test block in time, and the concrete test block for setting cured under same condition is stayed by job specfication requirement, with true Determine the tensioning time.
6. should conserve in time after concreting, duct, P anchor plate and grout hole are checked and cleared up.
(3) tension of prestressed tendon anchors
1. the tensioning time: concrete strength should be up to the tensioning for carrying out presstressed reinforcing steel after 100% and after management confirms, specifically The tensioning time is carried out by civil construction schedule requirement;There is concrete cube intensity written pressure testing report when tensioning, it is pre- with beam Stress rib uses corresponding tonnage jack entire beam tension, is such as limited to by execute-in-place space or other factors, is agreed to through designing institute, Also small-size jack can be used by root tensioning.
2. tension sequence: tension of prestressed tendon general sequence is sectional tensioned prestressing bar;To in Vierendeel girder when tensioning Every section of prestressed frame beam carries out symmetrical tensioning, the former head from both sides to centre by the way of sequence tensioning or from centre to both sides The mode of secondary beam after beam, the prestressing tendon in the same direction of pretensioning;
3. stretching process: only with the form of construction work of one or both ends tensioning, with a jack in structure when tensioned at one end Part one end carries out tensioning, and both ends tensioning is with 2 jack after the completion of component both ends carry out tensioning or first tensioning at one end simultaneously The other end is arrived again mends drawing;Such as limited to by execute-in-place space or other factors, agrees to through designing institute, small-size jack also can be used By root tensioning, control stress for prestressing σ is designedcon=0.75fptk, that is, 1395Mpa;
The stressing sequence of presstressed reinforcing steel are as follows:
1) presstressed reinforcing steel is that straight line lays 0 → 10% ó of ó con → 100% con anchoring in beam;
2) presstressed reinforcing steel is that curve is laid and hole count is less than or equal to 9 hole, 0 → 10% ó con → 100% of ó con → 60% in beam ó con anchoring;
3) in beam presstressed reinforcing steel be curve lay and big 9 hole, 0 → 10% ó of ó con → 30% ó of con → 60% con of hole count → 100% ó con anchoring;
4) when tension of prestressed tendon to whole pulling force, lotus 2min is preferably held;
5) one end pretensioning is used when the tensioning of both ends, another end mends tensioning;
6) dismountable big beam side before tensioning, to reduce influence of the template to crossbeam elastic compression.Beam bottom board and support are tight It is removed before prohibiting tensioning;
1. the stretching force of every beam presstressed reinforcing steel is N=1.0 σcon·As;
2. elongation value of stretching should be from 0.1 σconWith 1.0 σcon, measure calculate in two times, and make on-the-spot record;
3. oil pressure should slowly, steadily rise when tensioning;
4. bonded prestressed tendon: being stretched to another side from one side in order.Symmetrical tensioning is answered when tensioning, avoids structure not Equilibrium deformation, is detailed in Fig. 3, Fig. 4, Fig. 5;
5. otherwise actual elongation value and calculated extension value deviation should should suspend tensioning, find out original within+6%~-6% Cause simultaneously can continue tensioning after taking measures;
If tensioning should be suspended, found out 6. there is fracture of wire, stripped thread (steel strand wires fracture, steel strand wires slip, anchor clamp loosens) It can continue tensioning after reason and processing.
As described above, must not be explained although the present invention has been indicated and described referring to specific preferred embodiment For the limitation to invention itself.It without prejudice to the spirit and scope of the invention as defined in the appended claims, can be right Various changes can be made in the form and details for it.

Claims (4)

1. stretch-draw construction method in large-span concrete Vierendeel girder bonded prestress post-cast strip, it is characterised in that: including strutbeam Bed die installation and nonprestressed reinforcement binding, welding presstressed reinforcing steel bracket, bellows is installed, presstressed reinforcing steel is worn, concealed work Examination, casting concrete, tension of prestressed tendon, duct grouting, stretching end sealing off and covering anchorage;
Presstressed reinforcing steel wear include: both ends or one end bellows wear → bind bellows supporting point → stretching end install spiral Muscle and P anchor plate → alter-pouring strips mould plate block, and wherein post-cast strip first uses foam concrete heat-preserving plate to be blocked, then use mould Lath is blocked;
Tension of prestressed tendon:
(1) tension sequence: general sequence is sectional tensioning, to every section of prestressed frame beam in Vierendeel girder using sequence tensioning Mode carries out symmetrical tensioning from both sides to centre or from centre to both sides, the mode of secondary beam, the same side of pretensioning after first girder To prestressing tendon;
(2) stretching process: tensioned at one end carries out tensioning in component one end using a jack, and both ends tensioning is very heavy using 2 It withstands on component both ends while carrying out arriving other end benefit drawing again after the completion of tensioning or first tensioning at one end, component is casting concrete step Suddenly the concrete structure member formed;
(3) stressing sequence:
(31) presstressed reinforcing steel is straight line laying in beam: 0 → 10% ó of ó con → 100% con anchoring;
(32) presstressed reinforcing steel is that curve is laid and hole count is less than or equal to 9 holes: 0 → 10% ó of ó con → 60% ó of con → 100% con in beam Anchoring;
(33) presstressed reinforcing steel is curve laying and big 9 hole of hole count: 0 → 10% ó of ó con → 30% ó con → 100% of con → 60% in beam ó con anchoring.
2. stretch-draw construction method in large-span concrete Vierendeel girder bonded prestress post-cast strip according to claim 1, It is characterized by: the both ends bellows presstressed reinforcing steel wears process: bunchy is penetrated from any end after steel wire bundle is opened Bellows, guarantee penetrate the exposed steel strand wires equal length in rear both ends, it is ensured that stretching end working length is greater than 1m;One end bellows Presstressed reinforcing steel wears process: penetrating after being first arranged P anchor plate, spiral bar and constraint from fixing end bellows, fixing end extruding anchor It is adjacent to P anchor plate.
3. stretch-draw construction method in large-span concrete Vierendeel girder bonded prestress post-cast strip according to claim 1, It is characterized by: should check whether the position of bellows and P anchor plate is correct, and whether joint is firm before the casting concrete Gu;It when concrete enters mould, should avoid bellows by excessive impact as far as possible, shift and shrivel to prevent bellows;Concrete is answered Layering is vibrated, and pays attention to vibration compacting;Concrete test block is made, and stays the concrete examination for setting cured under same condition by job specfication requirement Block, to determine the tensioning time;It should be conserved in time after concreting, check and clear up duct, P anchor plate and grout hole.
4. stretch-draw construction method in large-span concrete Vierendeel girder bonded prestress post-cast strip according to claim 1, It is characterized by: the tension of prestressed tendon proof stress σcon=0.75fptk, i.e. 1395Mpa;When being stretched to whole pulling force, lotus is held 2min;The stretching force of every beam presstressed reinforcing steel is N=1.0 σconAs, As are the area of section of tensile region longitudinal direction regular reinforcement;Tensioning Stretch value should be from 0.1 σconWith 1.0 σcon, measure calculate in two times, and make on-the-spot record;Oil pressure is answered on slow, steady when tensioning It rises;Otherwise actual elongation value and calculated extension value deviation should should suspend tensioning within+6% ~ -6%, ascertain the reason and take It can continue tensioning after measure.
CN201610944762.6A 2016-11-02 2016-11-02 Stretch-draw construction method in large-span concrete Vierendeel girder bonded prestress post-cast strip CN106522561B (en)

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