CN102418400A - Pretensioning prestressed reinforced concrete precast beam - Google Patents
Pretensioning prestressed reinforced concrete precast beam Download PDFInfo
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- CN102418400A CN102418400A CN2010102976941A CN201010297694A CN102418400A CN 102418400 A CN102418400 A CN 102418400A CN 2010102976941 A CN2010102976941 A CN 2010102976941A CN 201010297694 A CN201010297694 A CN 201010297694A CN 102418400 A CN102418400 A CN 102418400A
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Abstract
The invention discloses a pretensioning prestressed reinforced concrete precast beam, comprising a beam body and a prestressed steel strand buried the beam body as a main rib, wherein, the beam body is provided with a stirrup, the partial part of the stirrup extends out of the upper surface of the beam body, the side wall of the beam body is provided with a plurality of formwork orifices along with the lengthwise direction, and the end portion of the beam body has a gap on the extension part of the steel strand. According to the invention, the pretensioning prestressed steel strand is used as the main rib of the precast beam, the use of the pretensioning prestressed steel strand can reduce the steel consumption of the main rib with guaranteeing the same strength, and the steel strand can freely elastically bend and is convenient for the installation of the beam; the end portion of the beam body form a gap, the gap saves space for the steel strand when bending and allows the steel strand to bend at the gap position, thus the steel strand can freely go through the orifice in the external structure to make the precast beam accuratedly reach the position, simultaneously the steel strand is easy for being anchored in the external structure after bending.
Description
Technical field
The present invention relates to a kind of precast beam, relate in particular to a kind of steel bar concrete precast beam that is used for the employing pretensioned prestressing of building.
Background technology
Prefabricated compound beam of the prior art mainly includes steel-concrete compound beam and steel bar concrete superposed beam, and precast beam can be produced on a large scale, can effectively reduce cost, improves efficiency of construction.But the most of teeth groove structure of end that adopts of existing precast beam connects and nonprestressed reinforcement, and the binding ability of the old and new's concrete is relatively poor, and the normal section shear strength is low.Aspect installation, reinforcing bar is difficult to bending in this precast beam, can't install in many occasions.And anchoring property is poor, has limited the popularization and the utilization of integral precast system.In addition, the connected node globality between the precast beam, between precast beam and the post is poor, and anti-seismic performance is also poor, uses in the earthquake-prone region restriction.So batch production so far building is failed large-area applications, this also causes precast beam to fail in reality is built, to be adopted by a large amount of.In order to solve design and the construction problem of precast beam in building course, occurred some in the prior art and be intended to solve the scheme of local problem.For example one Chinese patent application number is CN200810030491.9, and open day is on July 9th, 2008, discloses a kind of compound beam; Form by reinforced concrete prefabricated beam, shaped steel joint; Be connected with shaped steel on described reinforced concrete prefabricated beam two end bars, shaped steel joint one end is embedded in the wall column concrete, and is connected with reinforcing bar in the wall column; The other end is stayed outside the wall column concrete, and precast beam two ends shaped steel and shaped steel joint are connected to form the combination precast beam.But main muscle adopts plain bars in this scheme, the welding job amount, and connected node complex structure, and be non-superposed beam, depth of beam is big, and manufacturing cost is high, and working procedure is many, and progress is slow, and it is fast to be difficult to embody the construction speed that batch production builds, the advantage that cost is low.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiency of above-mentioned prior art, provides a kind of precast beam that makes things convenient for to install, be beneficial to the pretensioned prestressing steel bar concrete precast beam that the later stage floor is built construction and cost is low, be beneficial to large-scale production.
According to a kind of pretensioned prestressing steel bar concrete precast beam provided by the invention; Comprise that Liang Tihe is embedded in the said beam body prestress wire as main muscle; Said beam body is provided with stirrup; The part of said stirrup is stretched out the upper surface of said beam body, is vertically arranged with a plurality of nibs on the sidewall of said beam body, and the end of said beam body is formed with breach in said steel strand extending area.
Also have following attached technical characterictic according to a kind of pretensioned prestressing steel bar concrete precast beam provided by the invention:
Said breach is a wedge shape, and its degree of depth is 200mm-400mm.
The top of said beam end of body is provided with shelves shaped steel, and said part of shelving shaped steel is stretched out the end of said beam body.
The end of said beam body is a dentalation.
Be provided with fixed connecting piece in the said beam body, said fixed connecting piece is connected with the said shaped steel of shelving.
The steel strand extension is embedded with pectination net sheet in said bottom in the end of said beam body, and said net sheet bending is shaped, and inserts in the space between the said steel strand.
The end of said steel strand has enlarged footing.
On the said beam body all nibs are positioned on the same horizon, and said nib is through hole or blind hole.
Said steel strand adopt the pre-tensioning system construction to be embedded in the said beam body, and the quantity of said steel strand is the 3-18 root, and said steel strand are embedded in the bottom of said beam body, and the top of said beam body also is embedded with compressor wire or the steel strand that adopt the pre-tensioning system construction.
Be provided with hollow pipe fitting in said the nib.
Compared with prior art has following advantage according to a kind of pretensioned prestressing steel bar concrete precast beam provided by the invention: at first; The present invention is a kind of precast beam that adopts the pretensioned prestressing steel strand as main muscle, and this precast beam can adopt prestress wire can guarantee to have under the situation of same intensity as the pre-erection of superposed beam; Reduce the steel using amount of main muscle; Steel strand are elastic buckling more freely, makes things convenient for the installation of beam greatly, and precast beam is made in factory with the pretensioned prestressing technology; Can be in factory mass production, thus cost reduced with scale effect; Also be provided with nib, and a nib can bear concrete deadweight and construction load as the floor mould bases supporting member of construction stage with beam, save and landed bearing frame at Liang Tishang; Secondly; Beam body end formed jagged, this breach are steel strand slot millings when crooked, make steel strand crooked in indentation, there; Steel strand can pierce in the hole in the external structure freely; Make the precast beam can be accurately in place, simultaneously, be anchored in the external member body after also making the easy bending of steel strand; Once more, the present invention is provided with in the end of beam body and shelves shaped steel, when mounted; Shelve shaped steel as interim hold item; Be shelved on the external member, make things convenient for the in place of beam body, when precast beam and external member are cast in a time-out; This shelves shaped steel again as the shear key of the old and new's concrete bonding surface, has improved the shear strength in this cross section, place greatly.
Description of drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is the stereogram of Fig. 1.
Fig. 3 is the internal construction sketch map of Fig. 1.
Fig. 4 is the left view of Fig. 1.
Fig. 5 is the inner end portion structural representation of Fig. 1, the structure of the net of pectination shown in figure sheet.
Fig. 6 is the end partial enlarged drawing among Fig. 1.
Fig. 7 is the inner end portion partial structurtes enlarged drawing among Fig. 1.
Fig. 8 is the end enlarged drawing of the another kind of embodiment of the present invention.
The specific embodiment
Referring to Fig. 1 to Fig. 3; The embodiment of a kind of pretensioned prestressing steel bar concrete precast beam that provides in the present invention; Comprise beam body 1 and be embedded in the said beam body 1 that said beam body 1 is provided with stirrup 11, and the part of said stirrup 11 is stretched out the upper surface of said beam body 1 as the prestress wire 2 of main muscle; Be vertically arranged with a plurality of nibs 4 on the sidewall of said beam body 1, the end of said beam body 1 is formed with breach 12 in said steel strand 2 extending areas.
The so-called steel strand 2 of the present invention adopt many braided steel wires to form, and this kind steel strand 2 intensity are high, good toughness, and after adopting pre-tensioning system to stretch, the concrete of beam body can produce higher prestressing force.Beam body 1 of the present invention is provided with stirrup 11, and the stirrup 11 that is retained in beam body upper surface is used for the construction of colligation beam top master's muscle and cast-in-situ floor, thereby makes beam body and floor constitute overall structure.This kind is divided into the beam of twice construction also by superposed beam.
Referring to Fig. 2 and Fig. 4, in the foregoing description that the present invention provides, said steel strand 2 adopt the pre-tensioning system construction to be embedded in the said beam body 1, and the quantity of said steel strand 2 is the 3-18 root.Specifically can be chosen as 4,6,8,12,16.Present embodiment is 4.Adopt pre-tensioning system can economize technologies such as accessory such as Decanning, ground tackle and grouting construction, practiced thrift cost greatly, it is convenient to construct, and is suitable for large-scale production.Steel strand 2 consumptions that adopt the pre-tensioning system construction to be embedded in the beam body 1 obviously reduce than traditional reinforcing bar steel using amount.The prestress wire precast beam is when putting, and beam is known from experience and produced antiarch, thereby can effectively reduce the amount of deflection of superposed beam, reduces deck-molding, and the prestressing force superposed beam is not with crack work, and beam rigidity is big, good endurance.
Referring to Fig. 1 to Fig. 3, and Fig. 7; In the foregoing description that the present invention provides, the end of said steel strand 2 has enlarged footing 23, and said enlarged footing 23 is anchored in the concrete of connected node; Can improve the anchoring property of steel strand greatly, thereby improve the overall performance of structure.
Referring to Fig. 1 to Fig. 5, in the foregoing description that the present invention provides, 4 said steel strand 2 are embedded in the bottom of said beam body 1, and the top of said beam body 1 also is embedded with 2 prestress wires 21 that adopt the pre-tensioning system construction.4 steel strand in bottom are used to make precast beam to produce prestressing force in the present invention, and 2 steel strand 21 in top are used for the recurvation square of putting a generation of balance bottom steel strand 2, make beam body 1 upper surface avoid in the bottom producing when steel strand 2 are put the crack.For reduce upper steel twisted wire 21 when putting to the concrete local failure, can spiral hoop 22 be set in the position that upper steel twisted wire 21 stretches out beam body 1 end.Said spiral hoop 22 strengthens the local strength of its position, thereby can eliminate the local destruction of 21 pairs of concretes of upper steel twisted wire.Certainly, said upper steel twisted wire 21 also can be high-tensile steel wires.
Referring to Fig. 1 to Fig. 3, and Fig. 6, in the foregoing description that the present invention provides, the end of said beam body 1 is formed with breach 12 in said steel strand 2 extending areas.Steel strand 2 of the present invention are positioned at the bottom of said beam body 1, thereby make the beam body have prestressing force.Because the end of beam body and the gap of external member are very little, can't make precast beam accurately in place after steel strand and girder body are collided.For this reason, the present invention is provided with breach 12 in steel strand 2 extending areas, and steel strand 2 are crooked in breach 12, thereby make steel strand when colliding with external structure, and it can avoid in bending.Said breach 12 is a wedge shape, and its degree of depth L2 is 200mm-400mm.Can elect 200mm, 250mm, 300mm or 400mm as.Said steel strand can be done than macrobending and stretch in the external structure.
Referring to Fig. 1 to Fig. 3, in the foregoing description that the present invention provides, the present invention is provided with at the top of 1 two ends of beam body and shelves shaped steel 3, shelves bar when this shaped steel 3 is installed as beam body 1, makes can be placed on the external member when beam body 1 is installed in the early stage.When precast beam and external member are cast in a time-out, this shaped steel has improved the shear strength in this cross section, place greatly again as the shear key of the old and new's concrete bonding surface.Shaped steel 3 of the present invention is steel rod elements, thereby makes things convenient for precast beam in place.
Referring to Fig. 3 and Fig. 7, in the foregoing description that the present invention provides, be provided with fixed connecting piece 30 in the said beam body, said fixed connecting piece 30 is used for connecting shelves shaped steel 3, thereby improves the intensity of shelving shaped steel 3, makes it can bear the deadweight of beam.
Referring to Fig. 3, Fig. 5 and Fig. 7, in the foregoing description that the present invention provides, the root of said breach 12 is embedded with pectination net sheet 13, and said net sheet is converted into shape by the single steel bar Curved Continuous, and inserts in the space between the said steel strand 2.In the foregoing description that the present invention provides, because bottom steel strand 2 produce local failure to beam body concrete when putting, said net sheet 13 can prevent that this position concrete from producing the crack.This net sheet is at least two, satisfies requirement of strength with this.To net sheet and be bent into pectination, and insert in the space between the steel strand 2.This structure can make steel strand 2 need not to pass this net sheet, is making Liang Tishi, can be earlier with steel strand tension, and then lay net sheet, convenient construction.
Referring to Fig. 1 to Fig. 3; In the foregoing description that the present invention provides; The present invention is provided with a nib 4 in the both sides of beam body 1; Said nib 4 is used to install the supporting member of slab form, and slab form and bracing frame are installed on the supporting member, makes the cast-in-situ floor template need not to be provided with to land bearing frame.In addition, because of the deadweight of upper strata floor and working load can not be delivered to lower floor through landing bearing frame, therefore, lower floor's slab form can be removed after concrete reaches certain intensity in advance.Thereby improve all transfer efficients of template greatly, reduce form cost and use.Owing to need not to be provided with the intensive bearing frame such as scaffold that lands, make flooring spacious, be beneficial to other operations carry out synchronously move with construction equipment.
Referring to Fig. 1 to Fig. 3, in the foregoing description that the present invention provides, the nib 4 of all on the said beam body 1 is positioned on the same horizon, and said nib 4 is through hole, thereby makes the both sides of beam body 1 all have a nib.All nibs 4 are arranged on the same horizon, can guarantee that the template that is installed in nib 4 place is in same plane, thereby guarantee the planarization of whole floor.Said nib 4 is through hole, and the support member of template can directly pass, and shelves bar in the setting of the both sides of beam body, shelves bar and is used for mounting template or formwork-support.Certainly this nib 4 also can be arranged to blind hole, and is provided with respectively in the both sides of beam body, and this blind hole also can be used for mounting template.But being set, through hole is optimum scheme, easy to process, use also simpler.
Referring to Fig. 6, in the foregoing description that the present invention provides, be provided with hollow pipe fitting 41 in said the nib 4, said pipe fitting 41 is beneficial to the shaping of said nib 4.When making precast beam, hollow pipe fitting 41 is pre-set, the two ends shutoff of pipe fitting 41.After building completion, form said nib 4.Said pipe fitting 41 together bury underground with beam body 1 in.Said pipe fitting 41 not only is beneficial to the shaping of a nib 4, reduces the pore-forming cost of a nib 4.And played protective effect when using to beam body 1 in the later stage, prevent of the wearing and tearing of support shuttering spare for beam body 1 concrete.
Referring to Fig. 8, in the another kind of embodiment that the present invention provides, the end of said beam body 1 is not provided with shaped steel, but the end 14 of said beam body 1 is a dentalation.Dentalation is arranged in the end 14 of beam body 1, can guarantees that the end of beam body 1 and external member water when building up integral body, the old and new's concrete binding ability improves.Other structures of present embodiment are same as the previously described embodiments.
Claims (10)
1. pretensioned prestressing steel bar concrete precast beam; Comprise that Liang Tihe is embedded in the said beam body prestress wire as main muscle; Said beam body is provided with stirrup; The part of said stirrup is stretched out the upper surface of said beam body, it is characterized in that: be vertically arranged with a plurality of nibs on the sidewall of said beam body, the end of said beam body is formed with breach in said steel strand extending area.
2. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1, it is characterized in that: said breach is a wedge shape, its degree of depth is 200mm-400mm.
3. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1 is characterized in that: the top of said beam end of body is provided with shelves shaped steel, and said part of shelving shaped steel is stretched out the end of said beam body.
4. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1, it is characterized in that: the end of said beam body is a dentalation.
5. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 3 is characterized in that: be provided with fixed connecting piece in the said beam body, said fixed connecting piece is connected with the said shaped steel of shelving.
6. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1 is characterized in that: the steel strand extension is embedded with pectination net sheet in said bottom in the end of said beam body, and said net sheet bending is shaped, and inserts in the space between the said steel strand.
7. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1, it is characterized in that: the end of said steel strand has enlarged footing.
8. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1 is characterized in that: the nib of all on the said beam body is positioned on the same horizon, and said nib is through hole or blind hole.
9. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1; It is characterized in that: said steel strand adopt the pre-tensioning system construction to be embedded in the said beam body; And the quantity of said steel strand is the 3-18 root; Said steel strand are embedded in the bottom of said beam body, and the top of said beam body also is embedded with compressor wire or the steel strand that adopt the pre-tensioning system construction.
10. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1 is characterized in that: be provided with hollow pipe fitting in said the nib.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010297694.1A CN102418400B (en) | 2010-09-28 | 2010-09-28 | Pretensioning prestressed reinforced concrete precast beam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010297694.1A CN102418400B (en) | 2010-09-28 | 2010-09-28 | Pretensioning prestressed reinforced concrete precast beam |
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| CN102418400A true CN102418400A (en) | 2012-04-18 |
| CN102418400B CN102418400B (en) | 2014-07-09 |
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| CN201010297694.1A Active CN102418400B (en) | 2010-09-28 | 2010-09-28 | Pretensioning prestressed reinforced concrete precast beam |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102852281A (en) * | 2012-08-16 | 2013-01-02 | 杨众 | Prestressed precast main beam with laying gaps |
| CN102852280A (en) * | 2012-08-16 | 2013-01-02 | 杨众 | Precast pre-stressed beam with shelving corbel outs |
| CN103195172A (en) * | 2013-04-16 | 2013-07-10 | 东南大学 | Beam-column joint structure of prefabricated concrete frame |
| CN109868936A (en) * | 2017-12-05 | 2019-06-11 | 上海同吉建筑工程设计有限公司 | The prestressed concrete superposed beam and its design of post-tensioning slow cohesion, construction method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102852281A (en) * | 2012-08-16 | 2013-01-02 | 杨众 | Prestressed precast main beam with laying gaps |
| CN102852280A (en) * | 2012-08-16 | 2013-01-02 | 杨众 | Precast pre-stressed beam with shelving corbel outs |
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| CN109868936A (en) * | 2017-12-05 | 2019-06-11 | 上海同吉建筑工程设计有限公司 | The prestressed concrete superposed beam and its design of post-tensioning slow cohesion, construction method |
| CN109868936B (en) * | 2017-12-05 | 2021-11-05 | 上海同吉建筑工程设计有限公司 | Post-tensioning slowly-bonded prestressed concrete composite beam and design and construction method thereof |
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| CN102418400B (en) | 2014-07-09 |
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