CN105155868A - Method for pulling pillar through prestress using non-binding steel strands - Google Patents
Method for pulling pillar through prestress using non-binding steel strands Download PDFInfo
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- CN105155868A CN105155868A CN201510585307.7A CN201510585307A CN105155868A CN 105155868 A CN105155868 A CN 105155868A CN 201510585307 A CN201510585307 A CN 201510585307A CN 105155868 A CN105155868 A CN 105155868A
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Abstract
The invention discloses a method for pulling a pillar through prestress using non-binding steel strands. The method comprises a method of pulling the pillar through external prestress and a method of pulling the pillar through internal prestress, wherein the method of pulling the pillar through external prestress comprises the following steps: the bottom parts of the non-binding steel strands which are separately of a two-fold line shape or a three-fold line shape are inserted into the pillar, or the bottom parts of the non-binding steel strands support a bearing plate at the bottom of a girder on the two sides of the pillar; after the prestress is applied, an opposite force is generated at the pillar to balance the axial force of the pillar; and then the bearing pillar is pulled out. The method of pulling the pillar through internal prestress comprises the following steps: a non-binding steel strand internal prestress girder is arranged on the outer side of the original reinforced concrete girder on the two sides of the pillar, and the two sides and the bottom surface of the original reinforced concrete girder are wrapped inside; non-binding steel strands which are separately of a three-fold line shape or a parabola shape are arranged in the girder, and linear non-prestressed rebars are arranged; after the prestress is applied, an opposite bending moment is generated by the girder, so that a bending moment generated by load is balanced; and then the pillar is pulled out. The method disclosed by the invention fills the gap in pillar pulling rebuilding technology in China, and has the advantages that the construction is simple; unloading is not needed; temporary support does not need to be additionally arranged; the construction period is short; the cost is low; a structure above is not affected; the service life is consistent with that of an original structure; and the like.
Description
Technical field
The present invention relates to construction work renovation technique field, specifically a kind of non-bending steel cable prestressing force method for pulling out pillars.
Background technology
Load-bearing pillar is the most important primary structure member in house, whole building, is the basis ensureing that house, whole building is stable.But along with the development of production and the change of using function, sometimes need original pillar to pull out.But load-bearing pillar can be pulled out by technology also not relevant at present, therefore current in this technical field technology is also a blank.
Summary of the invention
The object of the present invention is to provide a kind of non-bending steel cable prestressing force method for pulling out pillars, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the invention provides following technical scheme: a kind of non-bending steel cable prestressing force method for pulling out pillars, comprise external prestressing and pull out post and prestressing with bond pulls out post, concrete operation method is as follows:
(1) non-bending steel cable external prestressing pulls out post
When pillar load is little, no more than 6 of the quantity of required steel strand, or more than 6 but end anchorage can process time adopt non-bending steel cable external prestressing to pull out post.Pillar is passed with in two fold-line-shapeds or bottom the non-bending steel cable of tri linear shape, or the bearing plate be located at bottom the crossbeam of pillar both sides is held in bottom, produce counter-force upwards at pillar place or bearing plate place after prestressed stretch-draw, balance the load that pillar bears, then load-bearing pillar is pulled out.
(2) non-bending steel cable prestressing with bond pulls out post
When pillar load is comparatively large, required steel strand quantity more than 6, and will adopt non-bending steel cable prestressing with bond to pull out post during the bad process of end anchorage.At post side former steel bar concrete crossbeam arranged outside non-bending steel cable prestressing with bond crossbeam, the both sides of original steel bar concrete crossbeam and bottom surface are wrapped in the inside, arrange in beam in tri linear shape or parabola shaped non-bending steel cable, and arrange the nonprestressed reinforcement of some linearly shapes, in three sides of original steel bar concrete crossbeam, connecting lacing wire is set, and stirrup is formed entirety through former crossbeam, and
have two nonprestressed reinforcements at least through pillar; After concrete strength reaches designing requirement, start prestressed stretch-draw, the reverse bending moment that stretch-draw produces later balances the moment of flexure that superstructure produces on crossbeam, is then pulled out by pillar.
As the further scheme of the present invention: described non-bending steel cable adopts ultimate strength to be 1860N/mm
2u Φ
j15.2 underrelaxation non-bending steel cables, ground tackle adopts round buss three clip type or two clip type single hole anchors.
As the further scheme of the present invention: pull out post for non-bending steel cable external prestressing, described non-bending steel cable overcoat
the white flame-proof PVC pipe of antisitic defect, can improve outward appearance, bearing plate and end anchorage C25 fine-stone concrete wrap up simultaneously; When there being requirements at the higher level, steel strand and bearing plate concrete being wrapped up, inside joins anticracking steel mesh reinforcement.
As the further scheme of the present invention: pull out post for non-bending steel cable prestressing with bond, described non-bending steel cable prestressing with bond crossbeam arranges one in a direction of pillar, or respectively establishes one in the direction in length and breadth of pillar.
As the further scheme of the present invention: pull out post for non-bending steel cable prestressing with bond, non-bending steel cable prestressing with bond crossbeam two sides are determined from the distance of former crossbeam according to the layout of non-bending steel cable, when the non-bending steel cable of every side arranges row, its distance is at least 100mm; When the non-bending steel cable of every side arranges that often increase by arranges, it is apart from corresponding increase at least 50mm.
As the further scheme of the present invention: pull out post for non-bending steel cable prestressing with bond, non-bending steel cable prestressing with bond crossbeam generally withstands floor and arranges, and injected hole is established by floor, concrete or grouting material is poured into from injected hole; Or non-bending steel cable prestressing with bond crossbeam is located at locates from about 200mm at the bottom of plate, concrete or grouting material are poured into from plate bottom girder end face.
As the further scheme of the present invention: when determining the quantity of non-bending steel cable, post is pulled out for non-bending steel cable external prestressing, the opposite force that prestressing force produces only balances the pillar axle power that whole proof load produces, and supporting capacity insufficient section is born by the negative reinforcing bar of the former crossbeam in post side; Pull out post for non-bending steel cable prestressing with bond, the moment of flexure that the reverse bending moment tension metrics dead load that prestressing force produces produces, supporting capacity insufficient section is born by the negative reinforcing bar of the former crossbeam of nonprestressed reinforcement and post side.
As the further scheme of the present invention: if the supporting capacity of adjacent pillars is not enough after pulling out post, then first reinforce adjacent pillars before pulling out post.
As the present invention's further scheme: if the basic supporting capacity deficiency of adjacent pillars maybe will produce larger sedimentation after pulling out post, then first reinforce base for post before pulling out post, or benefit is adopted to establish the mode of anchor jacked pile to reduce sedimentation.
Compared with prior art, the invention has the beneficial effects as follows: the inventive method has been filled up current China and there is no the blank of pulling out post transformation, there is construction simple, do not need unloading, do not need separately to establish temporary support, the construction period is short, and expense is low, the advantages such as superstructure is unaffected, and application life is synchronous with original structure.
Accompanying drawing explanation
Fig. 1 is that non-bending steel cable external prestressing pulls out post reinforcing schematic diagram;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the B-B sectional view of Fig. 1;
Fig. 4 is that non-bending steel cable prestressing with bond pulls out post reinforcing schematic diagram;
Fig. 5 is the C-C sectional view of Fig. 4;
Fig. 6 is the D-D sectional view of Fig. 4;
Fig. 7 is the E-E sectional view of Fig. 4.
In figure: 1-non-bending steel cable; The original steel bar concrete crossbeam of 2-; 3-bearing plate; 4-ground tackle; 5-billet; 6-adjacent pillars; 7-pillar to be pulled out; The non-prestressed positive reinforcement of 8-; The non-prestressed negative reinforcing bar of 9-; The non-prestressed bearing rod of 10-; 11-stirrup; The non-prestressed distributing bar of 12-; 13-connecting lacing wire; 14-injected hole.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
A kind of non-bending steel cable prestressing force method for pulling out pillars, comprise external prestressing and pull out post and prestressing with bond pulls out post, concrete operation step is as follows:
(1) non-bending steel cable external prestressing pulls out post, and exemplary plot is as Fig. 1-3
Pillar is passed with in two fold-line-shapeds or bottom the non-bending steel cable of tri linear shape, the bearing plate be located at bottom the crossbeam of pillar both sides is held in bottom, produce counter-force upwards after prestressed stretch-draw at pillar place or bearing plate place, balance the load that pillar bears, then load-bearing pillar is pulled out; After load-bearing pillar is pulled out, bearing plate and end anchorage fine-stone concrete wrap up, or by steel strand and bearing plate concrete parcel and in set up defences and split with steel mesh reinforcement;
Non-bending steel cable adopts ultimate strength to be 1860N/mm
2u Φ
j15.2 underrelaxation non-bending steel cable, ground tackle adopts round buss three clip type or two clip type single hole anchors, be anchored on reinforced concrete beam on adjacent pillar or vertical with adjacent pillars, or anchor is on steel pin rod.Bearing plate adopts 10 thick steel plates and Φ 50 thick walled steel tube to be welded, and No. 45 steels that steel pin rod is not less than Φ 60 by diameter are done.
(2) non-bending steel cable prestressing with bond pulls out post, and exemplary plot is as Fig. 4-7
At post side former steel bar concrete crossbeam arranged outside non-bending steel cable prestressing with bond crossbeam, arrange in being tri linear shape or parabola shaped non-bending steel cable in beam, and arrange the nonprestressed reinforcement of some linearly shapes, non-bending steel cable prestressing with bond crossbeam arranges one in a direction of pillar, or respectively establishes one in the direction in length and breadth of pillar.
The both sides of original steel bar concrete crossbeam and bottom surface are wrapped in the inside by non-bending steel cable prestressing with bond crossbeam, in three sides of original steel bar concrete crossbeam, connecting lacing wire is set, and stirrup is formed entirety through former crossbeam, and there are at least two nonprestressed reinforcements through pillar; Non-bending steel cable prestressing with bond crossbeam two sides are determined from the distance of former crossbeam according to the layout of non-bending steel cable, and when the non-bending steel cable of every side arranges row, its distance is at least 100mm; When the non-bending steel cable of every side arranges that often increase by arranges, it is apart from corresponding increase at least 50mm.
After concrete strength reaches designing requirement, start prestressed stretch-draw, the reverse bending moment that stretch-draw produces later balances the moment of flexure that superstructure produces on crossbeam, is then pulled out by pillar.
Non-bending steel cable adopts ultimate strength to be 1860N/mm
2u Φ
j15.2 underrelaxation non-bending steel cables, ground tackle adopts round buss three clip type or two clip type single hole anchors, and anchor is in the end of beam.
Non-bending steel cable prestressing with bond crossbeam generally heads on floor and arranges, and injected hole is established by floor, concrete or grouting material is poured into from injected hole, also crossbeam can be located at and locate from about 200mm at the bottom of plate, be poured into by concrete grouting material from plate bottom girder end face.
The reinforcement of adjacent pillars and base for post first completed before pulling out post.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.Any Reference numeral in claim should be considered as the claim involved by limiting.
Claims (10)
1. a non-bending steel cable prestressing force method for pulling out pillars, is characterized in that, comprise external prestressing and pull out post and prestressing with bond pulls out post, specific practice is as follows:
(1) non-bending steel cable external prestressing pulls out post
Pillar is passed with in two fold-line-shapeds or bottom the non-bending steel cable of tri linear shape, or the bearing plate be located at bottom the crossbeam of pillar both sides is held in bottom, produce counter-force upwards at pillar place or bearing plate place after prestressed stretch-draw, balance the load that pillar bears, then load-bearing pillar is pulled out.
(2) non-bending steel cable prestressing with bond pulls out post
At pillar both sides former steel bar concrete crossbeam arranged outside non-bending steel cable prestressing with bond crossbeam, the both sides of original steel bar concrete crossbeam and bottom surface are wrapped in the inside, arrange in beam in tri linear shape or parabola shaped non-bending steel cable, and arrange the nonprestressed reinforcement of some linearly shapes, in three sides of original steel bar concrete crossbeam, connecting lacing wire is set, and stirrup is formed entirety through former crossbeam, and there are at least two nonprestressed reinforcements through pillar; After concrete strength reaches designing requirement, start prestressed stretch-draw, the reverse bending moment that stretch-draw produces later balances the moment of flexure that superstructure produces on crossbeam, is then pulled out by pillar.
2. non-bending steel cable prestressing force method for pulling out pillars according to claim 1, is characterized in that, pull out post for non-bending steel cable external prestressing, no more than 6 of the quantity of non-bending steel cable, or more than 6 but end anchorage can process time; Post is pulled out for non-bending steel cable prestressing with bond, the quantity of non-bending steel cable more than 6, and during the bad process of end anchorage.
3. non-bending steel cable prestressing force method for pulling out pillars according to claim 1, it is characterized in that, pull out post for non-bending steel cable external prestressing, described non-bending steel cable overcoat has the white flame-proof PVC pipe of antisitic defect, and bearing plate and end anchorage C25 fine-stone concrete wrap up; When there being requirements at the higher level, steel strand and bearing plate concrete being wrapped up, inside setting up defences against splitting and using steel mesh reinforcement.
4. non-bending steel cable prestressing force method for pulling out pillars according to claim 1, is characterized in that, described non-bending steel cable adopts ultimate strength to be 1860N/mm
2u Φ
j15.2 underrelaxation non-bending steel cables, ground tackle adopts round buss three clip type or two clip type single hole anchors.
5. non-bending steel cable prestressing force method for pulling out pillars according to claim 1, it is characterized in that, pull out post for non-bending steel cable prestressing with bond, described non-bending steel cable prestressing with bond crossbeam arranges one in a direction of pillar, or respectively establishes one in the direction in length and breadth of pillar.
6. non-bending steel cable prestressing force method for pulling out pillars according to claim 1, it is characterized in that, post is pulled out for non-bending steel cable prestressing with bond, non-bending steel cable prestressing with bond crossbeam two sides are determined from the distance of former crossbeam according to the layout of non-bending steel cable, when the non-bending steel cable of every side arranges row, its distance is at least 100mm; When the non-bending steel cable of every side arranges that often increase by arranges, it is apart from corresponding increase at least 50mm.
7. non-bending steel cable prestressing force method for pulling out pillars according to claim 1, it is characterized in that, post is pulled out for non-bending steel cable prestressing with bond, non-bending steel cable prestressing with bond crossbeam generally withstands floor and arranges, injected hole established by floor, concrete or grouting material are poured into from injected hole; Also non-bending steel cable prestressing with bond crossbeam can be located at when clear height meets the demands and locate from about 200mm at the bottom of plate, concrete or grouting material are poured into from plate bottom girder end face.
8. non-bending steel cable prestressing force method for pulling out pillars according to claim 1, it is characterized in that, when determining the quantity of non-bending steel cable, post is pulled out for non-bending steel cable external prestressing, the opposite force that prestressing force produces only balances the pillar axle power that whole proof load produces, and supporting capacity insufficient section is born by the negative reinforcing bar of the former crossbeam in post side; Pull out post for non-bending steel cable prestressing with bond, the moment of flexure that the reverse bending moment tension metrics dead load that prestressing force produces produces, supporting capacity insufficient section is born by the negative reinforcing bar of the former crossbeam of nonprestressed reinforcement and post side.
9. non-bending steel cable according to claim 1 pulls out column technology, it is characterized in that, if the supporting capacity of adjacent pillars is not enough after pulling out post, then first reinforces adjacent pillars before pulling out post.
10. non-bending steel cable method for pulling out pillars according to claim 1, it is characterized in that, if the basic supporting capacity deficiency of adjacent pillars maybe will produce larger sedimentation after pulling out post, then first base for post is reinforced before pulling out post, or adopt benefit to establish the mode of anchor jacked pile to reduce sedimentation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510585307.7A CN105155868A (en) | 2015-09-16 | 2015-09-16 | Method for pulling pillar through prestress using non-binding steel strands |
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| CN201510585307.7A CN105155868A (en) | 2015-09-16 | 2015-09-16 | Method for pulling pillar through prestress using non-binding steel strands |
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Cited By (5)
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| CN105133781A (en) * | 2015-09-20 | 2015-12-09 | 成都育芽科技有限公司 | Novel building load-bearing floor |
| CN105569265A (en) * | 2015-12-25 | 2016-05-11 | 项剑锋 | Technology for reduction of beam section height by use of unbonded steel strand prestress |
| CN109537929A (en) * | 2018-11-30 | 2019-03-29 | 北京市建筑工程研究院有限责任公司 | Demolishing columns bracing means and reinforcement means |
| CN110331868A (en) * | 2019-07-16 | 2019-10-15 | 南通市规划设计院有限公司 | One kind going support cylinder External prestressed ruggedized construction and construction method |
| CN114319928A (en) * | 2022-02-15 | 2022-04-12 | 上海市建筑科学研究院有限公司 | Existing concrete structure column pulling method based on external prestress reinforcement technology |
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| CN110331868A (en) * | 2019-07-16 | 2019-10-15 | 南通市规划设计院有限公司 | One kind going support cylinder External prestressed ruggedized construction and construction method |
| CN110331868B (en) * | 2019-07-16 | 2021-03-19 | 南通市规划设计院有限公司 | External prestress reinforcing method for support pillar removing |
| CN114319928A (en) * | 2022-02-15 | 2022-04-12 | 上海市建筑科学研究院有限公司 | Existing concrete structure column pulling method based on external prestress reinforcement technology |
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