CN107558733A - The construction method that post-concreted expansion strip lower mold holder system is synchronously removed with periphery support for shuttering - Google Patents
The construction method that post-concreted expansion strip lower mold holder system is synchronously removed with periphery support for shuttering Download PDFInfo
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- CN107558733A CN107558733A CN201710884404.5A CN201710884404A CN107558733A CN 107558733 A CN107558733 A CN 107558733A CN 201710884404 A CN201710884404 A CN 201710884404A CN 107558733 A CN107558733 A CN 107558733A
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- post
- shuttering
- lower mold
- cast strip
- mold holder
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Abstract
The invention discloses the construction method that a kind of post-concreted expansion strip lower mold holder system and periphery support for shuttering are synchronously removed, comprise the following steps：According to specification arch camber during the beam-ends model sheetinstallat of post-cast strip both sides；Reinforcing bar colligation forms reinforced frame in beam, plate；The pre-buried high-strength bolt in post-cast strip end of reinforcing bar, the upper end of high-strength bolt stretch out in the upside of reinforced frame in beam；Casting concrete, back is flattened before concrete initial set；After concrete curing is qualified, steel construction load-carrying member is connected by beam-ends top surface of the pre-buried high-strength bolt in post-cast strip both sides；Remove post-cast strip lower mold holder system and periphery support for shuttering.I.e. during the beam and floor slab construction of post-concreted expansion strip both sides, steel construction load-carrying member is installed by pre-embedded bolt between the beam-ends top surface of post-cast strip both sides, shearing and the moment of flexure that original structure beam is received at post-cast strip are substituted by steel construction load-carrying member, so when post-cast strip periphery support for shuttering is removed, post-cast strip lower mold holder system can remove simultaneously.
Description
Technical field
The invention belongs to the realm of building construction, specifically a kind of post-concreted expansion strip lower mold holder system is synchronous with periphery support for shuttering
The construction method of dismounting.
Background technology
According to the requirement of existing related specifications, when floorslab concrete intensity reaches strength of mould stripping, the lower support for shuttering of floor is
It is dismountable, and post-cast strip should complete 60 days after agent structure and could be closed after settlement stability.Therefore, the lower mold holder body of post-cast strip
System must retain, it is impossible to removed with together with the lower support for shuttering of periphery floor, also must not first tear open and push up afterwards, to avoid differential settlement
Influence structure safety.
And post-cast strip lower mold holder system removes time irreversibility with periphery underfloor support for shuttering, following unfavorable shadow will be brought
Ring：
(1) circulation materials such as template, frame pipe, fastener are overstock for a long time, occupied fund, increase hiring cost；
(2) because template typically uses bakelite template, and the weatherability of bakelite template is poor, using should not shelve after once,
Otherwise the easy aging of bonded adhesives comes off, make template can the number of turnover greatly reduce；
(3) lower mold holder system in post-cast strip is removed not in time, space-consuming, has a strong impact on the horizontal transport of same layer material,
Influence construction safety and civilized construction image.
The content of the invention
The present invention is directed to the drawbacks described above of prior art, there is provided a kind of post-concreted expansion strip lower mold holder system and periphery support for shuttering
The construction method synchronously removed.
The construction method that this post-concreted expansion strip lower mold holder system provided by the invention is synchronously removed with periphery support for shuttering, bag
Include following steps：
(1) every across post-cast strip beam top is respectively provided with a steel construction load-carrying member；
(2) steel construction load-carrying member and pre-embedded bolt Deepen Design, the bolt design comprising steel construction load-carrying member；
(3) according to specification arch camber during post-cast strip both sides beam-ends model sheetinstallat；
(4) beam, reinforcing bar colligation forms reinforced frame in plate；
(5) in beam reinforcing bar the pre-buried high-strength bolt in post-cast strip end, the upper end of high-strength bolt stretches out in reinforced frame
Upside；
(6) casting concrete, back is flattened before concrete initial set；
(7) after concrete curing is qualified, connected by beam-ends top surface of the pre-buried high-strength bolt in post-cast strip both sides
Steel construction load-carrying member；
(8) post-cast strip lower mold holder system and periphery support for shuttering are removed.
The arch camber amount of template is the 0.2~0.4% of beam-ends cantilever span in step (1).
The diameter of high-strength bolt is not less than 16mm in step (3), is shaped as L-type, and the length of its galianconism is not less than in beam
15 times of bar diameter, long-armed upper end section be thread segment.
After high-strength bolt fixes in step (3), protection processing is carried out to the thread segment of its long-armed upper end.
In step (4), ensure that the flatness error of back is less than 2mm.
In step (5), steel construction load-carrying member uses section steel beam.
The steel construction load-carrying member includes I-steel main body, and bolt installation is symmetrical arranged at the both ends of I-steel main body
Hole, stiffener is set between the wing plate at I-steel main body both ends, stiffener is arranged at around bolt mounting holes.
Length of the both ends of the I-steel main body respectively with beam-ends overlap joint is not less than 350mm.
For the present invention during the beam and floor slab construction of post-concreted expansion strip both sides, the beam-ends in post-cast strip both sides is pre-buried high-strength
Bolt is spent, two beam-ends top surfaces are connected as a single entity by high-strength bolt and steel construction load-carrying member.After steel construction load-carrying member is crossed over
Band is poured, the beam-ends top surface of post-cast strip both sides is connected as a single entity by high-strength bolt, due to high-strength bolt and the master of structural beams
Muscle is connected as a single entity, further through concrete embedded, so after steel construction load-carrying member and high strength exploitation, steel construction load structure
For part as flexural member, alternative original structure beam bears shearing and moment of flexure at post-cast strip.That is steel construction load-carrying member
The stress of the post-cast strip bottom formwork system of prior art is changed into back portion stress, lower mold holder system is freed.Institute
So that when post-cast strip periphery support for shuttering is removed, post-cast strip lower mold holder system can remove simultaneously.Under customer service prior art post-cast strip
The defects of formwork system can not be removed simultaneously with periphery support for shuttering, the overstocking of materials of lower mold holder system is reduced, reduces hiring cost,
The service life of bakelite template can also be extended, convenient and security is provided for the horizontal transport of same layer material.Constructed at post-cast strip
When, formwork can use steel construction load-carrying member as hang mould support, saved again manually with frame pipe, fastener rental charge.Steel knot
Structure load-carrying member wide adaptability, reusable edible are green.
Brief description of the drawings
Fig. 1 is the schematic top plan view of one embodiment of the invention.
Fig. 2 is the A-A schematic cross-sectional views in Fig. 1.
Fig. 3 is the B-B schematic cross-sectional views in Fig. 1.
Sequence number in figure：1st, I-steel main body；2nd, high-strength bolt；3rd, stiffener
Embodiment
The construction method that this post-concreted expansion strip lower mold holder system disclosed by the invention is synchronously removed with periphery support for shuttering, bag
Include following steps：
(1) every across post-cast strip beam top is respectively provided with a steel construction load-carrying member；
(2) steel construction load-carrying member and pre-embedded bolt Deepen Design, the bolt design comprising steel construction load-carrying member；
The steel construction load-carrying member of the present invention is in design, because post-cast strip is usually placed at the 1/3 of girder span, steel knot herein
The moment of flexure and shearing that structure load-carrying member is born can be not provided with internal force value during post-cast strip by original structure beam.Steel construction load structure
Part presses flexural member with reference to GB50017-2003《Code for design of steel structures》Carry out section check, the pre-embedded bolt of post-cast strip both sides
Respectively refer to JGJ145-2013《Concrete post anchoring technical regulation》Checked by stretch bending built-in fitting.Crab-bolt model and spacing can be according to
Determined according to original structure beam actual loading situation by calculating.
(3) according to specification arch camber during post-cast strip both sides beam-ends model sheetinstallat；
(4) beam, reinforcing bar colligation forms reinforced frame in plate；
(5) in beam reinforcing bar the pre-buried high-strength bolt in post-cast strip end, the upper end of high-strength bolt stretches out in reinforced frame
Upside；
(6) casting concrete, back is flattened before concrete initial set；
(7) after concrete curing is qualified, connected by beam-ends top surface of the pre-buried high-strength bolt in post-cast strip both sides
Steel construction load-carrying member；
(8) post-cast strip lower mold holder system and periphery support for shuttering are removed.
In a kind of embodiment, the arch camber amount of template is the 0.2~0.4% of beam-ends cantilever span in step (1).
In a kind of embodiment, the diameter of high-strength bolt is not less than 16mm in step (3), is shaped as L-type, its
The length of galianconism not less than 15 times of bar diameter in beam, long-armed upper end section be thread segment.
In a kind of embodiment, after high-strength bolt fixes in step (3), to the thread segment of its long-armed upper end
Carry out protection processing.
In a kind of embodiment, in step (4), ensure that the flatness error of back is less than 2mm.
In a kind of embodiment, in step (5), steel construction load-carrying member uses section steel beam.
In one embodiment, steel construction load-carrying member includes I-steel main body, symmetrical at the both ends of I-steel main body
Bolt mounting holes are set, stiffener are set between the wing plate at I-steel main body both ends, stiffener is arranged at the week of bolt mounting holes
Enclose.
In one embodiment, length of the both ends of I-steel main body respectively with beam-ends overlap joint is not less than 350mm.
Below using the width of a top plate post-cast strip as 800mm, the sectional dimension of structure girder is exemplified by 200mm*800mm
To illustrate.
According to structural analysis and force analysis, the main body of the present embodiment steel construction load-carrying member use two web thickness for
Wing plate splicing is welding as one to be formed by 7mm No. 20 I-steel.
Beam-ends pre-embedded bolt uses 16# high-strength bolts, and from the bolt for being shaped as L-type, the long-armed upper end section of bolt is
Thread segment, long-armed length is not less than " high+two nut thickness of deck-molding+I-beam main body ", and the length of galianconism is not less than in beam
15 times of bar diameter.
Because the both ends of steel construction load-carrying member are connected fastening with pre-embedded bolt, processed at the both ends of I-steel main body
Aperture is 18mm bolt mounting holes.During in order to ensure bolt fastening, I-steel main body has enough intensity, in I-steel main body
Stiffener is set around each bolt mounting holes in both ends, and the thickness of stiffener is identical with the thickness of I-steel, is 7mm thick.
As shown in Figure 1 to Figure 3, the I-steel main body 1 of the present embodiment steel construction load-carrying member use two root long degree for
Wing plate splicing is welding as one by 1500mm No. 20 I-steel, and the bolt mounting holes at I-steel main body both ends are arranged symmetrically, and are often held
The row of two row three totally six bolt mounting holes are processed respectively, between two web outsides of I-steel main body and two webs, each bolt
Weld stiffener 3 in the both sides of mounting hole.
Arch camber amount during the model sheetinstallat of both ends is the 0.2-0.4% of both ends cantilever span.
Pre-buried high-strength bolt during assembling reinforcement frame, the long arm section of high-strength bolt is arranged in a vertical direction, its upper end
The length stretched out outside reinforced frame ensures that bolt can also connect two locking nuts after passing through the wing plate of I-steel main body, by high intensity
Bolt welds with cage bar in beam.After high-strength bolt fixes, the thread segment brushing lubricating oil blend compounds band of its upper end is tightly wrapped
Protect silk mouth not contaminated or damaged.
After the completion of back concreting, initial set before, top surface of the beam is flattened, it is ensured that the flatness error of back 2mm with
It is interior.After concrete curing is qualified, steel construction load-carrying member is installed：Beam-ends pre-buried high-strength bolt in post-cast strip both sides is worn respectively
The bolt mounting holes at I-steel main body both ends are crossed, adds again after being tightened by nut and twists a locking nut.
It can be seen from the general principle of reinforced concrete structure, when applying a load vertically downward in top surface of the beam, beam
Section upper portion pressurized, lower tension, compression and tension are undertaken by concrete and reinforcing bar respectively.The master disconnected at post-cast strip
Beam, there are following characteristics：
(1) beam section top：Concrete does not pour, it is impossible to bears compression；
(2) beam section bottom：Although non-casting concrete, beam bottom cage bar, which is not cut off, can bear tension；
(3) reinforcing bar does not form entirety with concrete, it is impossible to cooperation.
So when girder disconnects at post-cast strip, the beam does not possess the ability of bearing load, at present cutting herein
Power and moment of flexure undertake by lower mold holder system, so during unclosed in post-cast strip, lower mold holder system can not remove.
But the present invention is in the work progress of the curb girder of post-cast strip two and floor, respectively in the pre-buried high-strength bolt of two beam-ends,
The top surface of two beam-ends is connected as a single entity by the steel construction load-carrying member across post-cast strip and high-strength bolt come bear shearing and
Moment of flexure, so the effect of lower mold holder system just eliminates, so lower mold holder system can synchronously be removed around during support for shuttering dismounting.
Claims (8)
1. the construction method that a kind of post-concreted expansion strip lower mold holder system is synchronously removed with periphery support for shuttering, comprises the following steps：
(1) every across post-cast strip beam top is respectively provided with a steel construction load-carrying member；
(2) steel construction load-carrying member and pre-embedded bolt Deepen Design, the bolt design comprising steel construction load-carrying member；
(3) according to specification arch camber during post-cast strip both sides beam-ends model sheetinstallat；
(4) beam, reinforcing bar colligation forms reinforced frame in plate；
(5) in beam reinforcing bar the pre-buried high-strength bolt in post-cast strip end, the upper end of high-strength bolt stretches out in the upper of reinforced frame
Side；
(6) casting concrete, back is flattened before concrete initial set；
(7) after concrete curing is qualified, steel knot is connected by beam-ends top surface of the pre-buried high-strength bolt in post-cast strip both sides
Structure load-carrying member；
(8) post-cast strip lower mold holder system and periphery support for shuttering are removed.
2. the construction method that post-concreted expansion strip lower mold holder system as claimed in claim 1 is synchronously removed with periphery support for shuttering, its
It is characterised by：The arch camber amount of template is the 0.2~0.4% of beam-ends cantilever span in step (1).
3. the construction method that post-concreted expansion strip lower mold holder system as claimed in claim 1 is synchronously removed with periphery support for shuttering, its
It is characterised by：The diameter of high-strength bolt is not less than 16mm in step (3), is shaped as L-type, and the length of its galianconism is not less than in beam
15 times of bar diameter, long-armed upper end section be thread segment.
4. the construction method that post-concreted expansion strip lower mold holder system as claimed in claim 3 is synchronously removed with periphery support for shuttering, its
It is characterised by：After high-strength bolt fixes in step (3), protection processing is carried out to the thread segment of its long-armed upper end.
5. the construction method that post-concreted expansion strip lower mold holder system as claimed in claim 1 is synchronously removed with periphery support for shuttering, its
It is characterised by：In step (4), ensure that the flatness error of back is less than 2mm.
6. the construction method that mould holder is synchronously removed with periphery support for shuttering under post-concreted expansion strip as claimed in claim 1, it is special
Sign is：In step (5), steel construction load-carrying member uses section steel beam.
7. the construction method that post-concreted expansion strip lower mold holder system as claimed in claim 6 is synchronously removed with periphery support for shuttering, its
It is characterised by：The steel construction load-carrying member includes I-steel main body, and bolt installation is symmetrical arranged at the both ends of I-steel main body
Hole, stiffener is set between the wing plate at I-steel main body both ends, stiffener is arranged at around bolt mounting holes.
8. the construction method that post-concreted expansion strip lower mold holder system as claimed in claim 5 is synchronously removed with periphery support for shuttering, its
It is characterised by：Length of the both ends of the I-steel main body respectively with beam-ends overlap joint is not less than 350mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710884404.5A CN107558733B (en) | 2017-09-26 | 2017-09-26 | The construction method of post-concreted expansion strip lower die frame system dismounting synchronous with periphery support for shuttering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710884404.5A CN107558733B (en) | 2017-09-26 | 2017-09-26 | The construction method of post-concreted expansion strip lower die frame system dismounting synchronous with periphery support for shuttering |
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| CN107558733A true CN107558733A (en) | 2018-01-09 |
| CN107558733B CN107558733B (en) | 2018-10-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110939158A (en) * | 2020-01-07 | 2020-03-31 | 中国建筑第四工程局有限公司 | Force transmission device for settling post-cast strip part |
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|---|---|---|---|---|
| US5676874A (en) * | 1995-08-08 | 1997-10-14 | Lee; Wen-Yuan | Floor form assembly and apparatus used therewith |
| KR100749695B1 (en) * | 2006-11-02 | 2007-08-17 | 장성호 | Separable construction structure of post pouring concrete and the construction and dismantle method |
| CN101775903A (en) * | 2010-01-22 | 2010-07-14 | 北京首钢建设集团有限公司 | Construction method for pouring after settlement of reinforced concrete continuous beam with cohesive pre-stress |
| CN101832026A (en) * | 2010-04-07 | 2010-09-15 | 南通建工集团股份有限公司 | Construction method of sole plate post-poured strip form bracing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110939158A (en) * | 2020-01-07 | 2020-03-31 | 中国建筑第四工程局有限公司 | Force transmission device for settling post-cast strip part |
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| CN107558733B (en) | 2018-10-09 |
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