CN105178624A - Prestress wall removing technology implemented by aid of non-binding steel strands - Google Patents
Prestress wall removing technology implemented by aid of non-binding steel strands Download PDFInfo
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- CN105178624A CN105178624A CN201510367461.7A CN201510367461A CN105178624A CN 105178624 A CN105178624 A CN 105178624A CN 201510367461 A CN201510367461 A CN 201510367461A CN 105178624 A CN105178624 A CN 105178624A
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Abstract
The invention discloses a prestress wall removing technology implemented by the aid of non-binding steel strands. The prestress wall removing technology includes an external prestress wall removing technology implemented by the aid of the non-binding steel strands and an internal prestress wall removing technology implemented by the aid of the non-binding steel strands. The external prestress wall removing technology implemented by the aid of the non-binding steel strands is implemented when bearing walls to be removed are short in span or low in borne load and ring beams are arranged on the tops of the walls; the internal prestress wall removing technology implemented by the aid of the non-binding steel strands is implemented when the bearing walls to be removed are large in span or high in borne load, more than six steel strands are required by each bearing wall, end anchoring is difficult to handle or the ring beams are unavailable on the tops of the walls. The prestress wall removing technology has the advantages that the prestress wall removing technology is safe and simple in construction, short in construction period and low in cost, detachment or additional temporary bracing can be omitted, good effects can be realized, and the service lives are synchronized with those of original structures.
Description
Technical field
The present invention relates to construction work transformation field, specifically non-bending steel cable prestressing force is demolished walls technology.
Background technology
In brick masonry structure building, load bearing wall is most important supporting member, and it had both been used for bearing the weight of superstructure, played a part compartment wall again.The technology of existing dismounting load bearing wall is also relatively backward, and it is smaller to remove span, and bearing load is not very large load bearing wall.When span is little, displacement beam made by the general girder steel that adopts; When span is larger, adopts and establish reinforced concrete beam as displacement beam in load bearing wall both sides.Remove rear substitution beam due to load bearing wall and will produce distortion, easily cause superstructure to ftracture, and long in time limit, costly.
Summary of the invention
The object of the present invention is to provide and a kind ofly can remove that span is comparatively large, load also larger and superstructure can not be made to ftracture non-bending steel cable prestressing force is demolished walls technology, make up the blank of this respect; Simultaneously or load bearing wall that load little little for span, present invention provides a kind of method simple, the duration is short, effective, expense is low of constructing, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the invention provides following technical scheme:
Non-bending steel cable prestressing force is demolished walls technology, comprises demolish walls technology and non-bending steel cable prestressing with bond of non-bending steel cable external prestressing and to demolish walls technology;
Described non-bending steel cable external prestressing is demolished walls technology, two or four bearing plates are set in collar tie beam bottom surface, according to the quantity of the calculation of Bending Moment determination non-bending steel cable that proof load suffered on collar tie beam produces, the non-bending steel cable of multipair one-tenth tri linear shape is set by number of computations in collar tie beam both sides, hold the bearing plate be located at bottom collar tie beam, the two ends ground tackle of non-bending steel cable is anchored on the collar tie beam vertical with load bearing wall of two ends or on newly-increased pillar, or anchor is on the steel pin rod being located at this collar tie beam end;
Described non-bending steel cable prestressing with bond is demolished walls technology, a non-bending steel cable displacement beam is established in floor bottom or apart from floor bottom certain distance, the wide wall hole of a 250mm is offered at a certain distance in the wall body of displacement beam scope, bracing members is set, prop up superstructure weight, then the body of wall between bracing members is all cut, then arrange nonprestressed reinforcement and prestress wire; If there is collar tie beam, collar tie beam can be wrapped in the inside, form entirety by connecting lacing wire, non-bending steel cable is shape parabolically, and two ends ground tackle is anchored on the end face of beam.
As the further scheme of the present invention: described non-bending steel cable external prestressing is demolished walls technology, and the non-bending steel cable of use is ultimate strength is 1860N/mm
2u Φ
j15.2 underrelaxation non-bending steel cables, its end anchorage adopts round buss three intermediate plate or two clip type single hole anchors, be anchored on the column precipitator at the collar tie beam vertical with load bearing wall or two ends, or anchor is on the steel pin rod being located at this collar tie beam end; Bearing plate adopts 10 thick steel plates and Φ 50 thick walled steel tube to be welded; No. 45 steels that steel pin rod is not less than Φ 60 by diameter are done.
As the further scheme of the present invention: described non-bending steel cable external prestressing is demolished walls technology, the reverse bending moment that the upward force that the non-bending steel cable of use produces on bearing plate produces on collar tie beam equals the moment of flexure that proof load produces; When live load is larger, the antiarch value that collar tie beam produces is controlled, antiarch value is controlled in less than 1/400 of span, and the stretching force of every root non-bending steel cable is not more than 180KN.
As the further scheme of the present invention: to demolish walls technology for non-bending steel cable external prestressing, if there is constructional column at the two ends of the load bearing wall that will remove, and when the supporting capacity of constructional column is not enough, reply constructional column carries out consolidation process; If there is no constructional column, and column precipitator should be increased when original masonry supporting capacity is not enough again newly bear the load that the back rest of demolishing walls transmits; Base for post also will meet requirement for bearing capacity, and soft foundation will arrange anchor jacked pile.
As the further scheme of the present invention: to demolish walls technology for non-bending steel cable external prestressing, after prestressed stretch-draw, span centre ironware and non-bending steel cable fine-stone concrete are wrapped up, inside join anticracking fine steel rib in length and breadth, end anchorage is also with fine-stone concrete parcel, synchronous with original structure with the application life of structure after guaranteeing to demolish walls.
As the further scheme of the present invention: to demolish walls technology for non-bending steel cable prestressing with bond, non-bending steel cable adopts ultimate strength to be 1860N/mm
2u Φ
j15.2 underrelaxation non-bending steel cables, two ends ground tackle adopts garden sleeve three intermediate plate or two clip type single hole anchors, and non-prestressed positive muscle and negative muscle adopt III level steel, and stirrup and connecting lacing wire adopt II level steel.
As the further scheme of the present invention: to demolish walls technology for non-bending steel cable prestressing with bond; the moment of flexure that non-bending steel cable produces for bearing standard dead load; the moment of flexure that non-prestressed positive muscle and negative muscle produce for bearing live load design load; stirrup and connecting lacing wire are distributing bar, and the stretch-draw value of every root non-bending steel cable is not more than 180KN.
As the further scheme of the present invention: to demolish walls technology for non-bending steel cable prestressing with bond, when replace back floor arrange time, concrete or grouting material pour into from the fill orifice being located at plate top; Displacement beam can be left 200mm at the bottom of plate when clear height meets the demands to arrange, concrete and grouting material pour into from plate bottom girder end face.
As the further scheme of the present invention: to demolish walls technology for non-bending steel cable prestressing with bond, establish column precipitator at load bearing wall two ends, in order to bear the axial force that rear substitution beam of demolishing walls transmits and the capital moment of flexure produced by live load; Column precipitator is original post enlarging section or newly-increased post.
As the present invention's further scheme: to demolish walls technology for non-bending steel cable prestressing with bond, the supporting capacity that displacement beam, column precipitator and base for post must meet superstructure requires and settlement request, in soft foundation, adopt anchor rod static-pressing pile foundation.
Compared with prior art, the invention has the beneficial effects as follows:
1, the non-bending steel cable external prestressing technology of demolishing walls has construction simply, and do not need unloading, do not need separately to establish temporary support, the duration is short, effective, and application life is synchronous with original structure, the advantage that expense is low; Be applicable to remove span less, load is less, and wall top is provided with collar tie beam, no more than 6 of required steel strand quantity, or more than 6 but the manageable situation of end anchorage;
2, to change China's span large for the non-bending steel cable prestressing with bond technology of demolishing walls, the present situation that the load bearing wall that load is large cannot be removed, it is simple that it has construction safety, do not need unloading, do not need separately to establish temporary support, the construction period is short, effective, the advantages such as expense is low, does not affect superstructure, and application life is synchronous with original structure; Be applicable to remove span comparatively large, load is comparatively large, and required steel strand quantity is more than the situation of 6 and the bad process of end anchorage, or wall top does not have the situation of collar tie beam.
Accompanying drawing explanation
Fig. 1 is that non-bending steel cable external prestressing technology of demolishing walls reinforces 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 technology of demolishing walls reinforces schematic diagram;
Fig. 5 is the C-C sectional view of Fig. 4;
Fig. 6 is the D-D sectional view of Fig. 4.
In figure: 1-prestress wire; The original collar tie beam of 2-; 3-bearing plate; 4-ground tackle; 5-billet; 6-anticracking fine steel rib mesh sheet in length and breadth; Cut after 7-prestressed stretch-draw; 8-Outsourcing Concrete; The non-prestressed negative reinforcing bar of 9-; 10-bracing members; The non-prestressed handling reinforcement of 11-; The non-prestressed positive reinforcement of 12-; 13-stirrup; 14-replaces beam; The vertical muscle of 15-structure; The back wall of 16-steel strand tension cuts; 17-connecting lacing wire; 18-column precipitator; 19-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.
Refer to Fig. 1 ~ 6, in the embodiment of the present invention, non-bending steel cable prestressing force is demolished walls technology, comprises demolish walls technology and non-bending steel cable prestressing with bond of non-bending steel cable external prestressing and to demolish walls technology.
Non-bending steel cable external prestressing is demolished walls technology, two or four bearing plates are set in collar tie beam bottom surface, according to the quantity of the calculation of Bending Moment determination non-bending steel cable that proof load suffered on collar tie beam produces, the non-bending steel cable of multipair one-tenth tri linear shape is set by number of computations in collar tie beam both sides, hold the bearing plate be located at bottom collar tie beam, the two ends ground tackle of non-bending steel cable be anchored at two ends vertical with load bearing wall collar tie beam on or on newly-increased pillar, or anchor is on the steel pin rod being located at this collar tie beam end; After prestressed stretch-draw, bearing plate can produce counter-force upwards, collar tie beam can produce reverse moment of flexure, the moment of flexure produced on collar tie beam in order to balance external load, thus the load bearing wall under it is removed.
(1) the demolish walls soap-free emulsion polymeization steel steel strand that use in technology of non-bending steel cable external prestressing are ultimate strengths are 1860N/mm
2u Φ
j15.2 underrelaxation non-bending steel cables, its end anchorage adopts round buss three intermediate plate or two clip type single hole anchors, be anchored on the column precipitator at the collar tie beam two ends vertical with load bearing wall, or anchor is on the steel pin rod being located at this collar tie beam end; Bearing plate adopts 10 thick steel plates and Φ 50 thick walled steel tube to be welded; No. 45 steels that steel pin rod is not less than Φ 60 by diameter are done.
(2) non-bending steel cable external prestressing is demolished walls technology, and the reverse bending moment that the upward force that the non-bending steel cable of use produces on bearing plate produces on collar tie beam equals the moment of flexure that proof load produces; When live load is larger, the antiarch value that collar tie beam produces is controlled, antiarch value is controlled in less than 1/400 of span, and the stretching force of every root non-bending steel cable is not more than 180KN.
(3) non-bending steel cable external prestressing is demolished walls technology, if there is constructional column at the two ends of the load bearing wall that will remove, and when the supporting capacity of constructional column is not enough, reply constructional column carries out consolidation process; If there is no constructional column, and column precipitator should be increased when original masonry supporting capacity is not enough again newly bear the load that the back rest of demolishing walls transmits; Base for post also will meet requirement for bearing capacity, and soft foundation will arrange anchor jacked pile.
(4) non-bending steel cable external prestressing is demolished walls technology, after prestressed stretch-draw, span centre ironware and non-bending steel cable fine-stone concrete are wrapped up, inside join anticracking fine steel rib in length and breadth, end anchorage also wraps up with fine-stone concrete, synchronous with original structure with the application life of structure after guaranteeing to demolish walls, and make outward appearance more attractive in appearance.
Non-bending steel cable prestressing with bond is demolished walls technology, a non-bending steel cable prestressing force displacement beam is established in floor bottom or apart from floor bottom certain distance, the wide wall hole of a 250mm is offered at a certain distance in the wall body of displacement beam scope, bracing members is set, prop up superstructure weight, then the body of wall between bracing members is all cut, then arrange nonprestressed reinforcement and prestress wire; If there is collar tie beam, collar tie beam can be wrapped in the inside, entirety is formed by connecting lacing wire, non-bending steel cable is shape parabolically, two ends ground tackle is anchored on the end face of beam, prestressed stretch-draw can produce reverse bending moment to balance the moment of flexure that on beam, load produces later on beam, thus the load bearing wall under it is removed.
(1) non-bending steel cable prestressing with bond is demolished walls technology, and non-bending steel cable adopts ultimate strength to be 1860N/mm
2u Φ
j15.2 underrelaxation non-bending steel cables, two ends ground tackle adopts garden sleeve three intermediate plate or two clip type single hole anchors, and non-prestressed positive muscle and negative muscle adopt III level steel, and stirrup and connecting lacing wire can adopt II level steel.
(2) non-bending steel cable prestressing with bond is demolished walls technology; the moment of flexure that non-bending steel cable produces for bearing standard dead load; the moment of flexure that non-prestressed positive muscle and negative muscle produce for bearing live load design load; stirrup and connecting lacing wire are distributing bar, and the stretch-draw value of every root non-bending steel cable is not more than 180KN.
(3) non-bending steel cable prestressing with bond is demolished walls technology, when replace back floor arrange time, concrete or grouting material pour into from the fill orifice being located at plate top; Displacement beam can be left 200mm at the bottom of plate when clear height meets the demands to arrange, concrete and grouting material pour into from plate bottom girder end face.
(4) non-bending steel cable prestressing with bond is demolished walls technology, establish column precipitator at load bearing wall two ends, in order to bear the axial force that rear substitution beam of demolishing walls transmits and the capital moment of flexure produced by live load; Column precipitator is original post enlarging section or newly-increased post; When original pillar, original pillar enlarging section is reinforced, the dead load balanced by prestressing force due to can not at beam-ends production cross section corner, so moment of flexure can not be produced at capital.
(5) non-bending steel cable prestressing with bond is demolished walls technology, except the supporting capacity requirement that displacement beam and column precipitator must meet superstructure, base for post also must meet supporting capacity requirement, also must meet settlement request simultaneously, and superstructure can not be made to occur excessive deformation and cause cracking; Anchor rod static-pressing pile foundation is adopted in soft foundation.
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. non-bending steel cable prestressing force is demolished walls technology, it is characterized in that, comprises demolish walls technology and non-bending steel cable prestressing with bond of non-bending steel cable external prestressing and to demolish walls technology;
Described non-bending steel cable external prestressing is demolished walls technology, two or four bearing plates are set in collar tie beam bottom surface, according to the quantity of the calculation of Bending Moment determination non-bending steel cable that proof load suffered on collar tie beam produces, the non-bending steel cable of multipair one-tenth tri linear shape is set by number of computations in collar tie beam both sides, hold the bearing plate be located at bottom collar tie beam, the two ends ground tackle of non-bending steel cable is anchored on the collar tie beam vertical with load bearing wall of two ends or on newly-increased pillar, or anchor is on the steel pin rod being located at this collar tie beam end;
Described non-bending steel cable prestressing with bond is demolished walls technology, a non-bending steel cable prestressing force displacement beam is established in floor bottom or apart from floor bottom certain distance, the wide wall hole of a 250mm is offered at a certain distance in the wall body of displacement beam scope, bracing members is set, prop up superstructure weight, then the body of wall between bracing members is all cut, then arrange nonprestressed reinforcement and prestress wire; If there is collar tie beam, collar tie beam can be wrapped in the inside, form entirety by connecting lacing wire, non-bending steel cable is shape parabolically, and two ends ground tackle is anchored on the end face of beam.
2. non-bending steel cable prestressing force according to claim 1 is demolished walls technology, it is characterized in that, described non-bending steel cable external prestressing is demolished walls technology, and the non-bending steel cable of use is ultimate strength is 1860N/mm
2u Φ
j15.2 underrelaxation non-bending steel cables, its end anchorage adopts round buss three intermediate plate or two clip type single hole anchors, be anchored on the column precipitator at the collar tie beam vertical with load bearing wall or two ends, or anchor is on the steel pin rod being located at this collar tie beam end; Bearing plate adopts 10 thick steel plates and Φ 50 thick walled steel tube to be welded; No. 45 steels that steel pin rod is not less than Φ 60 by diameter are done.
3. non-bending steel cable prestressing force according to claim 1 is demolished walls technology, it is characterized in that, described non-bending steel cable external prestressing is demolished walls technology, and the reverse bending moment that the upward force that the non-bending steel cable of use produces on bearing plate produces on collar tie beam equals the moment of flexure that proof load produces; When live load is larger, the antiarch value that collar tie beam produces is controlled, antiarch value is controlled in less than 1/400 of span, and the stretching force of every root non-bending steel cable is not more than 180KN.
4. non-bending steel cable prestressing force according to claim 1 is demolished walls technology, it is characterized in that, non-bending steel cable external prestressing is demolished walls technology, if there is constructional column at the two ends of the load bearing wall that will remove, and the supporting capacity of constructional column not enough time, reply constructional column carries out consolidation process; If there is no constructional column, and column precipitator should be increased when original masonry supporting capacity is not enough again newly bear the load that the back rest of demolishing walls transmits; Base for post also will meet requirement for bearing capacity, and soft foundation will arrange anchor jacked pile.
5. non-bending steel cable prestressing force according to claim 1 is demolished walls technology, it is characterized in that, non-bending steel cable external prestressing is demolished walls technology, after prestressed stretch-draw, span centre ironware and non-bending steel cable fine-stone concrete are wrapped up, inside join anticracking fine steel rib in length and breadth, end anchorage is also with fine-stone concrete parcel, synchronous with original structure with the application life of structure after guaranteeing to demolish walls.
6. non-bending steel cable prestressing force according to claim 1 is demolished walls technology, it is characterized in that, to demolish walls technology for non-bending steel cable prestressing with bond, non-bending steel cable adopts ultimate strength to be 1860N/mm
2u Φ
j15.2 underrelaxation non-bending steel cables, two ends ground tackle adopts garden sleeve three intermediate plate or two clip type single hole anchors, and non-prestressed positive muscle and negative muscle adopt III level steel, and stirrup and connecting lacing wire adopt II level steel.
7. non-bending steel cable prestressing force according to claim 1 is demolished walls technology, it is characterized in that, non-bending steel cable prestressing with bond is demolished walls technology, the reverse bending moment that the moment of flexure that superstructure standard dead load produces is produced by non-bending steel cable balances, the moment of flexure that live load design load produces is born by non-prestressed positive muscle and negative muscle, stirrup and connecting lacing wire are distributing bar, and the stretch-draw value of every root non-bending steel cable is not more than 180KN.
8. non-bending steel cable prestressing force according to claim 1 is demolished walls technology, it is characterized in that, to demolish walls technology for non-bending steel cable prestressing with bond, when replace back floor arrange time, concrete or grouting material pour into from the fill orifice being located at plate top; Displacement beam can be left 200mm at the bottom of plate when clear height meets the demands to arrange, concrete and grouting material pour into from plate bottom girder end face.
9. non-bending steel cable prestressing force according to claim 1 is demolished walls technology, it is characterized in that, non-bending steel cable prestressing with bond is demolished walls technology, establishes column precipitator at load bearing wall two ends, in order to bear the axial force that rear substitution beam of demolishing walls transmits and the capital moment of flexure produced by live load; Column precipitator is original post enlarging section or newly-increased post.
10. non-bending steel cable prestressing force according to claim 9 is demolished walls technology, it is characterized in that, non-bending steel cable prestressing with bond is demolished walls technology, the supporting capacity that displacement beam, column precipitator and base for post must meet superstructure requires and settlement request, in soft foundation, adopt anchor rod static-pressing pile foundation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510367461.7A CN105178624A (en) | 2015-06-30 | 2015-06-30 | Prestress wall removing technology implemented by aid of non-binding steel strands |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510367461.7A CN105178624A (en) | 2015-06-30 | 2015-06-30 | Prestress wall removing technology implemented by aid of non-binding steel strands |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107815977A (en) * | 2017-10-13 | 2018-03-20 | 中建三局第三建设工程有限责任公司 | Pre-stressed steel plate and presstressed reinforcing steel composite reinforcement large-span concrete beam construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH03233076A (en) * | 1990-02-08 | 1991-10-17 | Ohbayashi Corp | Dismantlement method of gas tank |
| CN101832034A (en) * | 2010-04-22 | 2010-09-15 | 上海市第一建筑有限公司 | Construction method of whole reverse replacement of structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107815977A (en) * | 2017-10-13 | 2018-03-20 | 中建三局第三建设工程有限责任公司 | Pre-stressed steel plate and presstressed reinforcing steel composite reinforcement large-span concrete beam construction method |
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