CN100489256C - Construction method and construction technique for wide cross section beam formwork supporting system - Google Patents
Construction method and construction technique for wide cross section beam formwork supporting system Download PDFInfo
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- CN100489256C CN100489256C CNB2008100706387A CN200810070638A CN100489256C CN 100489256 C CN100489256 C CN 100489256C CN B2008100706387 A CNB2008100706387 A CN B2008100706387A CN 200810070638 A CN200810070638 A CN 200810070638A CN 100489256 C CN100489256 C CN 100489256C
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Abstract
The present invention discloses a construction method for wide section beam formwork support systems. The method adopts a V-shaped formwork for support, and the dead weight of a frame-supported beam and construction load are transmitted to a structure of a lower layer and independently undertaken by a lower layer framework beam at a corresponding position. When the lower framework beam is insufficient in bearing capacity, the insufficient part is complemented through the measures of enlarging the section of the framework beam in advance and increasing reinforcing bars. Due to the V-shaped oblique support transmission force, the dead weight of a frame-supported beam and construction load are undertaken only by one layer of framework beam without putting up multilayer supports. Therefore, the methods gives full play to the bearing potential of the framework beam, does not need to occupy a large number of circulating materials, is small in the quantity of increased formworks, reinforcing steel bars, concrete and other auxiliary materials, relatively reduces cost, has obvious economic benefit, and simultaneously creates conditions for the construction of other processes, so as to shorten construction period as a whole.
Description
Technical field
The present invention relates to a kind of construction techniques, refer to a kind of wide cross section beam formwork supporting system and job practices especially.
Background technology
In highrise building, usually one deck conversion layer can be set, be used for carrying the load that the top increases.The frame strutbeam of this conversion layer often will have relatively large sectional dimension and deadweight owing to will bear upper load, so design and construction that its template supports are one of emphasis of whole frame strutbeam construction.
Unit in charge of construction is generally the frame strutbeam shutterings-supported construction method of different cross section width at present:
Which floor 1, as shown in Figure 1, when frame strutbeam 1 cross section height but during width little (approaching), generally meet the demands by floor 4 and the common load of beam by vertical support (some vertical rods 3) with following one deck framework 2 beams.
2, as shown in Figure 2, when frame strutbeam 1 ' cross section height and width when big (referring generally to width is more than the twice of lower floor's Vierendeel girder 2), also be to adopt vertical support bar actuating system, vertical vertical rod 3 reaches power on the relatively low structural slab of bearing capacity, needs multilayer to support and could satisfy force request.
3, as shown in Figure 3, during the frame strutbeam of other unit in charge of construction big deadweight of large scale in solving the high building structure conversion layer at present, still the method that adopts above-mentioned vertical support shuttering to construct, just and when the sectional dimension of frame strutbeam 1 ＂ is the several times of lower floor's Vierendeel girder 2, which floor vertical rod 3 will increase support density under the vertical rod 3 of frame strutbeam 1 ＂ below reached, and supported requirement to satisfy.
Take a broad view of above-mentioned job practices, described frame strutbeam 1,1 ', 1 ＂ is when construction, regardless of its width, template all is to support by vertical vertical rod 3, because the load that the frame strutbeam will bear is bigger, its width all can be wideer than the Vierendeel girder 2 of lower floor, therefore always have 3 of part even most of vertical rods on floor 4, but because floor 4 bearing capacities are generally much smaller than the load that will bear, adopt and successively share off-load to the method for lower support by multiple layer and could satisfy force request, can not remove even beam slab (fine strain of millet and floor) intensity reaches requirement, described needs take more circulation material, and holding time is longer, deficiency in economic performance.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of wide cross section beam formwork supporting system and job practices, and it needs individual layer can carry the template that broad cuts section bar, thereby significantly reduces auxiliary turnover materials, reduction expense, reduction of erection time.
For reaching above-mentioned technical problem, technical solution of the present invention is:
A kind of wide cross section beam formwork supporting system: the template that adopts " V " shape to support, by oblique vertical rod described frame strutbeam deadweight and working load are in an organized way reached down one deck structure, independently bear by lower floor's Vierendeel girder of correspondence position.
And cut power when not enough when holding of lower floor's Vierendeel girder, the cross section of insufficient section by strengthening Vierendeel girder in advance is or/and increase the arrangement of reinforcement measure and supply.
In each oblique vertical rod of described frame strutbeam supported underneath, middle one be vertical setting, and is that center line is symmetrical arranged with this vertical posts.
A kind of wide cross section beam formwork supporting system job practices, its flow process is: the stressed checking computations of substructure → template supported design and checking computations → following one deck Vierendeel girder construction → frame strutbeam " V " shape is supported and template construction → frame strutbeam reinforcement construction → concrete construction, monitoring → maintenance → template and supporting removal.
During one deck Vierendeel girder is constructed this step under described, before this Vierendeel girder concrete is built, be embedded with anti-skidding bar dowel by the spacing that supports oblique vertical rod, this anti-skidding bar dowel should be consistent with the angle of inclination of oblique vertical rod when pre-buried; Relative, frame strutbeam " V " shape support and this step of template construction in, when setting up oblique vertical rod, its bottom should be inserted in the pre-buried anti-skidding bar dowel.
After adopting such scheme, because the template that the present invention adopts " V " shape to support, utilize oblique support power transmission, the deadweight and the working load of frame strutbeam are only born by one deck Vierendeel girder, do not do the multilayer support and need not take, give full play to the potential bearing capacity of Vierendeel girder, only need in case of necessity the Vierendeel girder of frame strutbeam below is suitably strengthened satisfying force request, need not take a large amount of circulation materials, the template that is increased, reinforcing bar, concrete and other auxiliary material consumption are few, will set up multilayer with respect to tradition supports, materials significantly reduce, so expense reduces relatively, and economic benefit is more remarkable, create condition for other operation construction simultaneously, shortened the duration in general.
Description of drawings
Fig. 1 is that traditional frame props up the beam section height but width when little, the form of construction work schematic diagram;
Fig. 2 is that traditional frame props up beam section height and width when big, the form of construction work schematic diagram;
Fig. 3 is traditional frame strutbeam sectional dimension when being lower floor's Vierendeel girder several times, the form of construction work schematic diagram;
Fig. 4 is the horizontal schematic diagram of support system of the present invention;
Fig. 5 is vertical schematic diagram of support system of the present invention;
Fig. 6 is a job practices flow chart of the present invention;
Fig. 7 is the present invention " V " shape support system drawing;
Fig. 8 is the oblique vertical rod bottom schematic view of Fig. 7;
Fig. 9 is the vertical drawing of the present invention " V " shape support system.
The specific embodiment
Involved in the present invention is in a kind of reinforced concrete structure, deadweight is big, with the ratio of lower floor Vierendeel girder breadth of section more than twice, and the frame corresponding with lower floor Vierendeel girder position props up beam formwork supporting system and is:
1. the template that adopts " V " shape to support in an organized way reaches down one deck structure by oblique vertical rod with described frame strutbeam deadweight and working load, is independently born by lower floor's Vierendeel girder of correspondence position, cuts potentiality to give full play to holding of Vierendeel girder.
2. cut power when not enough when holding of lower floor's Vierendeel girder, a force request is cut to satisfy to hold or/and increase measure such as arrangement of reinforcement and supply in the cross section that insufficient section can be by strengthening Vierendeel girder in advance.
Specifically shown in Fig. 4,5, in the conversion layer A of highrise building, need to be provided with the frame strutbeam 1 of large scale, big deadweight, according to designing requirement, this frame strutbeam 1 can run through described conversion layer A and be through among the substructure layer B, also can all be arranged in conversion layer A, and the Vierendeel girder 2 of this frame strutbeam 1 below in the substructure layer B.When carrying out the shutterings-supported construction of conversion layer A, with 3 of the vertical rods of plurality of vertical between the floor 4 of described conversion layer A and its substructure layer B, in order to the floor of support conversion layer A, and, then be provided with fastener 6 between vertical rod 3 and the cross bar 5 with some horizontal cross bar 5 supplemental support; The below of described frame strutbeam 1 is then radial be supported with some oblique vertical rods 3 ', thereby forming " V " shape supports, and each oblique vertical rod 3 ' the top prop up in the below of this frame strutbeam 1, its the bottom then prop up in the top of lower floor's Vierendeel girder 2, each oblique vertical rod 3 ' and horizontal cross bar 5 between also be provided with fastener 6.It is pointed out that except that the substructure layer B of the described conversion layer A of next-door neighbour which floor deck B all no longer needs any support down again.
As shown in Figure 6, wide cross section beam formwork supporting system job practices flow process of the present invention is:
The stressed checking computations of substructure → template supported design and checking computations → following one deck Vierendeel girder construction → frame strutbeam " V " shape is supported and template construction → frame strutbeam reinforcement construction → concrete construction, monitoring → maintenance → template and supporting removal.
Detailed process is as follows:
One, the stressed checking computations of substructure are mainly down the checking of bearing capacity of one deck Vierendeel girder 2
1, the characteristics of analysis block strutbeam reach one deck Vierendeel girder plated construction characteristics down, calculation block strutbeam load, and frame strutbeam load is calculated as follows:
q＝γ
1q
1+γ
2q
2
Q-design load in the formula;
q
1-construction dead load standard value comprises template, reinforcing bar, concrete deadweight etc.;
q
2-construction live load standard value comprises constructor and equipment load;
γ
1-dead load partial safety factor;
γ
2-mobile load partial safety factor.
2, checking computations Vierendeel girder bearing capacity
Working load and its condition of conducting oneself with dignity and independently bearing according to the frame strutbeam by following one deck Vierendeel girder, the normal section that calculation block is set a roof beam in place, sloping section and anti-impact are cut supporting capacity, and be calculated as satisfy the load requirement and breadth of section that needs increase and arrangement of reinforcement (annotate: Vierendeel girder after changing still will be brought into play original design function, to keep with structure, for not influencing the architectural space height, do not increase depth of beam during the change cross section as far as possible), Vierendeel girder after changing need carry out the checking computations of Crack Control and amount of deflection.
Two, formwork bracing system design and checking computations
1, support system design
1) prop up the beam forms line load according to frame,, roughly calculate every vertical rod supporting capacity in conjunction with supporting frame scaffolding height and horizontal cross bar quantity, thus tentatively determine every row's vertical rod quantity, post apart from, and " V " shape support vertical array pitch.
2) in " V " shape support system, vertical posts is established in middle and both sides, and the both sides vertical posts should be located at beyond the beam bottom board, directly transmits downwards by the vertical posts of both sides to avoid frame strutbeam load.
3) bottom of all oblique vertical rods of " V " shape should all stand on lower floor's Vierendeel girder, and be that center line is symmetrical arranged with the vertical rod of beam intermediate vertical, every oblique vertical rod bottom spacing should be able to satisfy the space requirement of binding fastener, when being not enough to arrange brace as the width of Vierendeel girder, should be by the suitable widening beam of design alteration cross section to meet the demands.
2, support system checking computations
1) stability of vertical rod checking computations
" V " shape is supported the oblique vertical rod of outermost inclination angle maximum, is subjected to axial pressure and additional bending moment effect, is the least favorable rod member, its Calculation on stability:
The axial pressure design load of N-vertical rod in the formula;
The radius of gyration of i-calculating vertical rod;
A-vertical rod net cross-sectional area;
W-vertical rod net section resistance moment;
M
w-act on the moment of flexure in the oblique vertical rod;
σ-vertical rod compressive strength calculated value (N/mm
2);
[f]-vertical rod compressive strength design load.
2) oblique vertical rod and the antiskid of horizontal cross bar node fastener move checking computations:
R≤Rc
Rc in the formula-fastener antiskid Design of Bearing Capacity value;
R-horizontal cross bar pulling force.
Three, one deck Vierendeel girder construction down
1, need to strengthen the Vierendeel girder cross section, should carry out formwork, need to increase arrangement of reinforcement, the colligation construction together of Ying Yuyuan design reinforcing bar, and strict the examination by the sectional dimension after strengthening.
2, before the Vierendeel girder concrete is built, by support oblique vertical rod 3 ' the pre-buried anti-skidding bar dowel 7 of spacing, shown in Fig. 7,8, this anti-skidding bar dowel 7 when pre-buried should with oblique vertical rod 3 ' the angle of inclination consistent.
3, the intensity of Vierendeel girder reaches 100% o'clock of design strength, supports and template at the bottom of the dismountable beam, makes it meet the Force Calculation model, and all the other template dies and must not support are removed, and when remaining to the concrete dismounting intensity that reaches regulation by the related specifications regulation.
Four, frame strutbeam " V " shape is supported and template construction, and " V " shape is supported and set up (as Fig. 7)
1, sets up drawing according to support system, set up both sides and middle vertical posts 3 successively, the horizontal horizontal cross bar 5 and the bar of sweeping the floor (i.e. the cross bar on close ground).
2, set up the horizontal cross bar 5 and the bar of sweeping the floor longitudinally.
3, set up oblique vertical rod 3 ', this oblique vertical rod 3 ' the inclination angle should with set up figure in require consistently, its bottom should be inserted in the pre-buried anti-skidding bar dowel 7, and shell tool 8, oblique vertical rod 3 ' with cross bar 5 one by one usefulness cross rotary buckle 6 lock.
4, supporting both sides, bridging 9 (as shown in Figure 9) is set continuously longitudinally, this bridging 9 becomes 60 degree angles, no more than 5 of the vertical rod number that jumps with ground.
5, after support system was set up and finished, flitch 10 was laid perpendicular to the direction of the cross bar 5 of the top in the edge, spreads beam bottom board 11 then, and beam bottom board 11 can adopt two-ply.
Five, frame strutbeam reinforcement construction, concrete construction, monitoring, maintenance
During the concreting of frame strutbeam, should in the middle of the beam cross section, build, make the support producing balanced forces, avoid the support body unstability to bilateral symmetry.Should there be the special messenger to be responsible for the monitoring and the tour of support body simultaneously, should stops during unusual circumstance building, and take urgent measure, wait to investigate thoroughly after reason is removed hidden danger and can continue construction.
Six, template and supporting removal
After frame strutbeam concrete strength reaches 100% design strength, stripping support system after supervisor's approval.After form removable finishes, cut off pre-buried anti-skidding bar dowel 7.
Claims (5)
1, a kind of wide cross section beam formwork supporting system is characterized in that: the template that adopts " V " shape to support, by oblique vertical rod described frame strutbeam deadweight and working load are in an organized way reached down one deck structure, and independently bear by lower floor's Vierendeel girder of correspondence position.
2, wide cross section beam formwork supporting system as claimed in claim 1 is characterized in that: and cut power when not enough when holding of lower floor's Vierendeel girder, the cross section of insufficient section by strengthening Vierendeel girder in advance is or/and increase the arrangement of reinforcement measure and supply.
3, wide cross section beam formwork supporting system as claimed in claim 1 or 2 is characterized in that: in each oblique vertical rod of described frame strutbeam supported underneath, middle one be vertical setting, and is that center line is symmetrical arranged with this vertical posts.
4, a kind of wide cross section beam formwork supporting system job practices is characterized in that this job practices flow process is: the stressed checking computations of substructure
Template supported design and checking computations
Following one deck Vierendeel girder construction
Frame strutbeam " V " shape is supported and template construction
Frame strutbeam reinforcement construction
Concrete construction, monitoring
Maintenance
Template and supporting removal.
5, wide cross section beam formwork supporting system job practices as claimed in claim 4, it is characterized in that: described one deck Vierendeel girder is down constructed in this step, before this Vierendeel girder concrete is built, be embedded with anti-skidding bar dowel by the spacing that supports oblique vertical rod, this anti-skidding bar dowel should be consistent with the angle of inclination of oblique vertical rod when pre-buried; Relative, frame strutbeam " V " shape support and this step of template construction in, when setting up oblique vertical rod, its bottom should be inserted in the pre-buried anti-skidding bar dowel.
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| CNB2008100706387A CN100489256C (en) | 2008-02-13 | 2008-02-13 | Construction method and construction technique for wide cross section beam formwork supporting system |
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| CNB2008100706387A CN100489256C (en) | 2008-02-13 | 2008-02-13 | Construction method and construction technique for wide cross section beam formwork supporting system |
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| CN100489256C true CN100489256C (en) | 2009-05-20 |
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| CN102251657B (en) * | 2011-04-08 | 2013-04-17 | 重庆建工集团股份有限公司 | Arching formwork erecting method for assembled framework beam plate |
| CN103321406B (en) * | 2013-07-03 | 2015-10-28 | 河北省第二建筑工程有限公司 | A kind of support system of tall and big floor template |
| CN110287637B (en) * | 2019-07-03 | 2020-03-10 | 西南交通大学 | Calculation method for elastic-plastic buckling bearing capacity |
| CN112031400B (en) * | 2020-09-03 | 2021-06-11 | 北京市第三建筑工程有限公司 | Construction method of concrete dome structure template |
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