CN102418400B - Pretensioning prestressed reinforced concrete precast beam - Google Patents

Pretensioning prestressed reinforced concrete precast beam Download PDF

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Publication number
CN102418400B
CN102418400B CN201010297694.1A CN201010297694A CN102418400B CN 102418400 B CN102418400 B CN 102418400B CN 201010297694 A CN201010297694 A CN 201010297694A CN 102418400 B CN102418400 B CN 102418400B
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beam body
steel strand
reinforced concrete
concrete precast
precast beam
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CN102418400A (en
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杨峰
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Huahui Engineering Design Group Co., Ltd.
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HUAHUI ENGINEERING DESIGN GROUP Co Ltd
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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

A kind of pretensioned prestressing reinforced concrete precast beam
Technical field
The present invention relates to a kind of precast beam, relate in particular to a kind of reinforced concrete precast beam of the employing pretensioned prestressing for building.
Background technology
Prefabricated combined 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 tooth slot structure that adopts end of existing precast beam connects and nonprestressed reinforcement, and the binding ability of the old and new's concrete is poor, and normal section shear strength is low.Aspect installation, in this precast beam, reinforcing bar is difficult to bending, cannot install in many occasions.And anchoring property is poor, popularization and the utilization of integral precast system are limited.In addition, the connected node globality between precast beam, between precast beam and post is poor, and anti-seismic performance is also poor, and in earthquake-prone region, restriction is used.So batch production so far building is failed large-area applications, this also causes precast beam to fail to be adopted in a large number in reality is built.In order to solve design and the construction problem of precast beam in building course, in prior art, occur that some are intended to solve the scheme of local problem.For example Chinese Patent Application No. is CN200810030491.9, open day is on July 9th, 2008, a kind of compound beam is disclosed, formed by reinforced concrete prefabricated beam, shaped steel joint, on described reinforced concrete prefabricated beam two end bars, be connected with shaped steel, shaped steel joint one end is embedded in wall column concrete, and is connected with the reinforcing bar in wall column, the other end is stayed outside wall column concrete, and precast beam two ends shaped steel and shaped steel joint are connected to form combination precast beam.But main muscle adopts plain bars in this scheme, welding job amount, connecting joint structure complexity, and be non-superposed beam, depth of beam is large, and manufacturing cost is high, and working procedure is many, and progress is slow, is difficult to embody the construction speed that batch production builds fast, 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 and facilitate precast beam install, is beneficial to the pretensioned prestressing reinforced concrete precast beam that later stage floor is built construction and cost is low, be beneficial to large-scale production.
According to a kind of pretensioned prestressing reinforced concrete precast beam provided by the invention, comprise that Liang Tihe is embedded in the prestress wire as main muscle in described beam body, on described beam body, be provided with stirrup, the part of described stirrup is stretched out the upper surface of described beam body, on the sidewall of described beam body, be vertically arranged with multiple nibs, the end of described beam body is formed with breach in described steel strand extending area.
Also there is following attached technical characterictic according to a kind of pretensioned prestressing reinforced concrete precast beam provided by the invention:
Described breach is wedge shape, and its degree of depth is 200mm-400mm.
The top of described beam end of body is provided with shelves shaped steel, described in shelve the end that the part of shaped steel is stretched out described beam body.
The end of described beam body is dentalation.
In described beam body, be provided with fixed connecting piece, described fixed connecting piece with described in shelve shaped steel and be connected.
The end of described beam body is embedded with pectination net sheet at described bottom steel strand extension, and described net sheet bending is shaped, and inserts in the space between described steel strand.
The end of described steel strand has enlarged footing.
All nibs on described beam body are positioned on same level line, and described nib is through hole or blind hole.
Described steel strand adopt pre-tensioning system construction to be embedded in described beam body, and the quantity of described steel strand is 3-18 root, and described steel strand are embedded in the bottom of described beam body, and the top of described beam body is also embedded with the compressor wire or the steel strand that adopt pre-tensioning system construction.
In described nib, be provided with hollow pipe fitting.
According to a kind of pretensioned prestressing reinforced concrete precast beam provided by the invention compared with prior art tool have the following advantages: first, the present invention is a kind of precast beam of pretensioned prestressing steel strand as main muscle that adopt, this precast beam can be served as the pre-erection of superposed beam, adopt prestress wire can guarantee to have in the situation of same intensity, reduce the steel using amount of main muscle, steel strand are elastic buckling more freely, greatly facilitate the installation of beam, precast beam is manufactured in factory by pretensioned prestressing technology, can produce in factory mass, thereby reduce cost with scale effect, also be provided with nib at Liang Tishang, and a nib can bear concrete deadweight and construction load by the floor mould bases supporting member using beam as the construction stage, save and landed bearing frame, secondly, beam body end formed jagged, slot milling when this breach is steel strand bending, make steel strand in indentation, there bending, steel strand can pierce in the hole in external structure freely, make the precast beam can be accurately in place, meanwhile, also make to be anchored in external member body after the easy bending of steel strand, again, the present invention arranges and shelves shaped steel in the end of beam body, when mounted, shelve shaped steel as interim hold item, be shelved on external member, facilitate the in place of beam body, together with precast beam is cast in external member time, this shelves shaped steel again as the shear key of the old and new's concrete bonding surface, has greatly improved the shear strength in this cross section, place.
Accompanying drawing explanation
Fig. 1 is front view of the present invention.
Fig. 2 is the stereogram of Fig. 1.
Fig. 3 is the internal construction schematic diagram 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 in Fig. 1.
Fig. 7 is the inner end portion partial structurtes enlarged drawing in 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 reinforced concrete precast beam providing in the present invention, comprise beam body 1 and be embedded in the prestress wire 2 as main muscle in described beam body 1, on described beam body 1, be provided with stirrup 11, and the part of described stirrup 11 is stretched out the upper surface of described beam body 1, on the sidewall of described beam body 1, be vertically arranged with multiple nibs 4, the end of described beam body 1 is formed with breach 12 in described 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 of 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, is retained in the stirrup 11 of beam body upper surface for the construction of the main muscle in colligation beam top and cast-in-situ floor, thereby makes beam body and floor form overall structure.This kind is divided into the also superimposed beam of beam of twice construction.
Referring to Fig. 2 and Fig. 4, in the above-described embodiment providing in the present invention, described steel strand 2 adopt pre-tensioning system construction to be embedded in described beam body 1, and the quantity of described steel strand 2 is 3-18 root.Specifically can be chosen as 4,6,8,12,16.The present embodiment is 4.Adopt pre-tensioning system can economize the techniques such as the accessory such as Decanning, ground tackle and grouting construction, greatly saved cost, construct convenient, be suitable for large-scale production.Adopt pre-tensioning system steel strand 2 consumptions that are embedded in beam body 1 of constructing obviously to reduce than traditional reinforcing bar steel using amount.Prestress wire precast beam is in the time putting, and beam is known from experience and produced antiarch, thereby can effectively reduce the amount of deflection of superposed beam, reduces deck-molding, not work with cracking of prestressing force superposed beam, and beam rigidity is large, good endurance.
Referring to Fig. 1 to Fig. 3 and Fig. 7, in the above-described embodiment providing in the present invention, the end of described steel strand 2 has enlarged footing 23, and described enlarged footing 23 is anchored in the concrete of connected node, can greatly improve the anchoring property of steel strand, thereby improve the overall performance of structure.
Referring to Fig. 1 to Fig. 5, in the above-described embodiment providing in the present invention, 4 described steel strand 2 are embedded in the bottom of described beam body 1, and the top of described beam body 1 is also embedded with 2 prestress wires 21 that adopt pre-tensioning system construction.4 of bottoms steel strand are used for making precast beam to produce prestressing force in the present invention, and 2, top steel strand 21 are for the recurvation square of putting a generation of balance bottom steel strand 2, make beam body 1 upper surface avoid producing crack in the time that bottom steel strand 2 are put.For reduce upper steel twisted wire 21 in the time putting to concrete local failure, the position that can stretch out beam body 1 end at upper steel twisted wire 21 arranges spiral hoop 22.Described spiral hoop 22 strengthens the local strength of its position, thereby can eliminate the destruction of upper steel twisted wire 21 to concrete part.Certainly, described upper steel twisted wire 21 can be also high-tensile steel wires.
Referring to Fig. 1 to Fig. 3 and Fig. 6, in the above-described embodiment providing in the present invention, the end of described beam body 1 is formed with breach 12 in described steel strand 2 extending areas.Steel strand 2 of the present invention are positioned at the bottom of described beam body 1, thereby make beam body have prestressing force.Due to the end of beam body and the gap of external member very little, steel strand and girder body cannot make precast beam accurately in place after colliding.For this reason, the present invention is provided with breach 12 in steel strand 2 extending areas, and steel strand 2 are in the interior bending of breach 12, thereby makes steel strand in the time colliding with external structure, and it can avoid in bending.Described breach 12 is wedge shape, and its degree of depth L2 is 200mm-400mm.Can elect 200mm, 250mm, 300mm or 400mm as.Described steel strand can do compared with macrobending and stretch in external structure.
Referring to Fig. 1 to Fig. 3, in the above-described embodiment providing in the present invention, the present invention is provided with and shelves shaped steel 3 at the top of 1 two ends of beam body, when this shaped steel 3 is installed as beam body 1, shelves bar, when beam body 1 is installed in the early stage, can be placed on external member.Together with precast beam is cast in external member time, this 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.Shaped steel 3 of the present invention is steel rod elements, thereby facilitates precast beam in place.
Referring to Fig. 3 and Fig. 7, in the above-described embodiment providing in the present invention, in described beam body, be provided with fixed connecting piece 30, described fixed connecting piece 30 is shelved shaped steel 3 for connecting, thereby improves the intensity of shelving shaped steel 3, the deadweight that can bear beam.
Referring to Fig. 3, Fig. 5 and Fig. 7, in the above-described embodiment providing in the present invention, the root of described breach 12 is embedded with pectination net sheet 13, and described net sheet is converted into shape by single steel bar Curved Continuous, and inserts in the space between described steel strand 2.In above-described embodiment that the present invention provides, because bottom steel strand 2 produce local failure to beam body concrete in the time putting, described net sheet 13 can prevent that this position concrete from producing crack.This net sheet is at least two, meets requirement of strength with this.Net sheet is bent into pectination, and inserts in the space between steel strand 2.This structure can make steel strand 2 without through this net sheet, is manufacturing Liang Tishi, can be first by steel strand tension, and then lay net sheet, convenient construction.
Referring to Fig. 1 to Fig. 3, in the above-described embodiment providing in the present invention, the present invention is provided with a nib 4 in the both sides of beam body 1, described nib 4 is for installing the supporting member of slab form, slab form and bracing frame are arranged on supporting member, make cast-in-situ floor template land bearing frame without setting.In addition, because the deadweight of upper strata floor and working load can not be delivered to lower floor by landing bearing frame, therefore, lower floor's slab form can be removed in advance after concrete reaches some strength.Thereby greatly improve all transfer efficients of template, reduce formwork cost.Due to without the intensive bearing frames such as scaffold that land are set, make flooring spaciousness, be beneficial to other operations synchronously carry out move with construction equipment.
Referring to Fig. 1 to Fig. 3, in the above-described embodiment providing in the present invention, all nibs 4 on described beam body 1 are positioned on same level line, and described nib 4 is through hole, thereby make the both sides of beam body 1 all have a nib.All nibs 4 are arranged in the same horizontal line, can guarantee that the template that is arranged on nib 4 place is in same plane, thereby guarantee the planarization of whole floor.Described nib 4 is through hole, and the support member of template can directly pass, and arranges and shelve bar in the both sides of beam body, shelves bar for installation form or formwork-support.Certainly this nib 4 also can be arranged to blind hole, and arranges respectively in the both sides of beam body, and this blind hole also can be for installation form.But being set, through hole is optimum scheme, easy to process, use also simpler.
Referring to Fig. 6, in the above-described embodiment providing in the present invention, in described nib 4, be provided with hollow pipe fitting 41, described pipe fitting 41 is beneficial to the shaping of a described nib 4.In the time manufacturing precast beam, hollow pipe fitting 41 is pre-set, by the two ends shutoff of pipe fitting 41.After having built, form a described nib 4.Described pipe fitting 41 together bury underground with beam body 1 in.Described pipe fitting 41 is not only beneficial to the shaping of a nib 4, reduces the pore-forming cost of a nib 4.And in the time that the later stage is used, played the protective effect to beam body 1, prevent the wearing and tearing of supporting die plate for beam body 1 concrete.
Referring to Fig. 8, in the another kind of embodiment providing in the present invention, the end of described beam body 1 does not arrange shaped steel, but the end 14 of described beam body 1 is dentalation.Dentalation is arranged to in the end of beam body 1 14, can guarantees that the end of beam body 1 and external member water while building up entirety, the old and new's concrete binding ability improves.Other structures of the present embodiment are same as the previously described embodiments.

Claims (10)

1. a pretensioned prestressing reinforced concrete precast beam, comprise that Liang Tihe is embedded in the prestress wire as main muscle in described beam body, described beam body is provided with stirrup, the part of described stirrup is stretched out the upper surface of described beam body, it is characterized in that: on the sidewall of described beam body, be vertically arranged with multiple nibs, the end of described beam body is formed with breach in described steel strand extending area.
2. a kind of pretensioned prestressing reinforced concrete precast beam as claimed in claim 1, is characterized in that: described breach is wedge shape, its degree of depth is 200mm-400mm.
3. a kind of pretensioned prestressing reinforced concrete precast beam as claimed in claim 1, is characterized in that: the top of described beam end of body is provided with shelves shaped steel, described in shelve the end that the part of shaped steel is stretched out described beam body.
4. a kind of pretensioned prestressing reinforced concrete precast beam as claimed in claim 1, is characterized in that: the end of described beam body is dentalation.
5. a kind of pretensioned prestressing reinforced concrete precast beam as claimed in claim 3, is characterized in that: in described beam body, be provided with fixed connecting piece, described fixed connecting piece with described in shelve shaped steel and be connected.
6. a kind of pretensioned prestressing reinforced concrete precast beam as claimed in claim 1, it is characterized in that: the end of described beam body is embedded with pectination net sheet at the described prestress wire extension of bottom, described net sheet bending is shaped, and inserts in the space between described steel strand.
7. a kind of pretensioned prestressing reinforced concrete precast beam as claimed in claim 1, is characterized in that: the end of described steel strand has enlarged footing.
8. a kind of pretensioned prestressing reinforced concrete precast beam as claimed in claim 1, is characterized in that: all nibs on described beam body are positioned on same level line, and described nib is through hole or blind hole.
9. a kind of pretensioned prestressing reinforced concrete precast beam as claimed in claim 1, it is characterized in that: described steel strand adopt pre-tensioning system construction to be embedded in described beam body, and the quantity of described steel strand is 3-18 root, described steel strand are embedded in the bottom of described beam body, and the top of described beam body is also embedded with the compressor wire or the steel strand that adopt pre-tensioning system construction.
10. a kind of pretensioned prestressing reinforced concrete precast beam as claimed in claim 1, is characterized in that: in described nib, be provided with hollow pipe fitting.
CN201010297694.1A 2010-09-28 2010-09-28 Pretensioning prestressed reinforced concrete precast beam Active CN102418400B (en)

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CN102418400B true CN102418400B (en) 2014-07-09

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102852280B (en) * 2012-08-16 2016-07-13 杨众 The prestressing force precast beam of head shelved by a kind of band
CN102852281B (en) * 2012-08-16 2015-12-30 杨众 A kind of have the prestressing force precast main beam of shelving breach
CN103195172B (en) * 2013-04-16 2015-09-09 东南大学 A kind of prefabrication and assembly construction concrete frame beam-column connection structure
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

Citations (6)

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Publication number Priority date Publication date Assignee Title
GB1411980A (en) * 1972-09-19 1975-10-29 Taylor R Reinforced and prestressed concrete structures
CN2633992Y (en) * 2003-09-09 2004-08-18 吴方伯 Steel bar concrete prefabricated member for compound girder
JP2005212435A (en) * 2004-02-02 2005-08-11 Shimizu Corp Manufacturing process of prestressed-precast concrete beam, and joining method of the beam and pole
CN101215855A (en) * 2008-01-16 2008-07-09 吴方伯 Combination beam
CN101228321A (en) * 2005-04-13 2008-07-23 英特康斯泰克株式会社 Segments for building spliced prestressed concrete girder and method of manufacturing the segments
CN201794216U (en) * 2010-09-28 2011-04-13 杨峰 Reinforced concrete prefabricated beam pre-stressed by pre-tensioning method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1411980A (en) * 1972-09-19 1975-10-29 Taylor R Reinforced and prestressed concrete structures
CN2633992Y (en) * 2003-09-09 2004-08-18 吴方伯 Steel bar concrete prefabricated member for compound girder
JP2005212435A (en) * 2004-02-02 2005-08-11 Shimizu Corp Manufacturing process of prestressed-precast concrete beam, and joining method of the beam and pole
CN101228321A (en) * 2005-04-13 2008-07-23 英特康斯泰克株式会社 Segments for building spliced prestressed concrete girder and method of manufacturing the segments
CN101215855A (en) * 2008-01-16 2008-07-09 吴方伯 Combination beam
CN201794216U (en) * 2010-09-28 2011-04-13 杨峰 Reinforced concrete prefabricated beam pre-stressed by pre-tensioning method

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