CN102418402A - Pre-tensioned prestressed reinforced concrete precast beam - Google Patents
Pre-tensioned prestressed reinforced concrete precast beam Download PDFInfo
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- CN102418402A CN102418402A CN2010102977018A CN201010297701A CN102418402A CN 102418402 A CN102418402 A CN 102418402A CN 2010102977018 A CN2010102977018 A CN 2010102977018A CN 201010297701 A CN201010297701 A CN 201010297701A CN 102418402 A CN102418402 A CN 102418402A
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Abstract
The invention relates to a pre-tensioned prestressed reinforced concrete precast beam which comprises a beam body and prestressed steel strands which are buried in the beam body and serve as main bars, wherein the beam body is provided with stirrups, the stirrup parts extend out of the upper surface of the beam body, at least one end part of the beam body is provided with section steel which is suitable for being connected with an external structure, the section steel part is buried in the beam body, the other parts are exposed at the end part of the beam body, and a plurality of support formwork holes are arranged on at least one side wall of the beam body along the longitudinal direction. The section steel is arranged at the end part of the precast beam, thereby being conductive to mounting of the precast beam; the section steel can also serve as a member for combining new concrete with old concrete or a mounting shelving member of a column or a beam; and simultaneously, the support formwork holes are arranged on the beam body, and the support formwork holes can enable the beam to be used as a load-bearing member during the construction stage for bearing the dead weight of the concrete, thereby omitting a landing load-bearing frame.
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 the connected node complex structure, and be non-superposed beam, the beam overall height is big.Manufacturing cost is high, and working procedure is many, and progress is slow, and the construction speed that is difficult to embody the batch production building is 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 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; And the part of said stirrup is stretched out the upper surface of said beam body, and at least one end of said beam body is provided with and is suitable for the shaped steel that is connected with external structure, and the part of said shaped steel is embedded in the said beam body; Remainder is placed on the end of said beam body, is vertically arranged with a plurality of nibs at least one sidewall of said beam body.
Also have following attached technical characterictic according to a kind of pretensioned prestressing steel bar concrete precast beam provided by the invention:
Said steel strand are embedded in the bottom of said beam body, and the top of said beam body also is embedded with prestressed high strength steel wire or the steel strand that adopt the pre-tensioning system construction.
The end of said steel strand has enlarged footing.
Being placed on the external said shaped steel of said beam is provided with bolt hole and/or is suitable for the perforation that the outside column stirrup is walked.
The end of said beam body is formed with breach in said steel strand extending area, and the degree of depth of said breach is 50mm-150mm, or the degree of depth of said breach is 200mm-400mm.
On the said beam body all nibs are positioned on the same horizon; Said nib is through hole or blind hole; The diameter of said nib is 2cm-8cm, and the spacing between adjacent said the nib is 80cm-200cm, the end face 8cm-20cm of the said beam body of the centre distance of said nib.
At least the said bottom of part steel strand are with sleeve pipe, and said sleeve pipe is embedded in the end of said beam body.
The end that is embedded in the shaped steel in the said beam body is a step.
Said bottom steel strand adopt the pre-tensioning system construction to be embedded in the said beam body, and the quantity of said bottom steel strand is the 3-18 root.
The root of said breach is embedded with pectination net sheet, and said net sheet bending is shaped, and inserts in the space between the said steel strand.
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; Secondly, the present invention is provided with shaped steel in the end of precast beam, is beneficial to the installation of precast beam; This shaped steel double as combines shear key for the old and new's concrete; Conduct is shelved member with the installation of post or beam again, simultaneously, also is provided with a nib at Liang Tishang; And nib can bear concrete deadweight and construction load as the floor mould bases supporting member of construction stage with beam, has saved to land bearing frame; Once more; Beam body end formed jagged, this breach are steel strand slot millings when crooked, because steel strand are very little from the gap of beam end of body and external member; Steel strand are difficult in the gap crooked; And breach is set, and make steel strand crooked in indentation, there, avoid directly contacting and can't make precast beam accurately in place with the post reinforcing bar; At last, 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.
Description of drawings
Fig. 1 is the front view of an embodiment 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 front view of the other a kind of embodiment of the present invention.
Fig. 9 is the internal construction sketch map of Fig. 8.
Figure 10 is the left view of Fig. 8.
Figure 11 is the end enlarged drawing of Fig. 8.
The specific embodiment
Referring to Fig. 1, Fig. 2 and 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; At least one end of said beam body 1 is provided with and is suitable for the shaped steel 3 that is connected with external structure; The part of said shaped steel 3 is embedded in the said beam body 1, and remainder is placed on the end of said beam body 1, is vertically arranged with a plurality of nibs 4 at least one sidewall of said beam body 1.
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, said stirrup 11 and steel strand 2 colligations together, 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 formation overall structure.This kind is divided into the beam of twice construction also by superposed beam, and beam is divided into girder and secondary beam, and its middle girder mainly is installed on the post, and secondary beam then is installed on the girder.Structure shown in Fig. 1 to Fig. 7 among the present invention is a secondary beam, and Fig. 8 is a girder to structure shown in Figure 11, and as can be seen from the figure girder can be slightly different on end construction with secondary beam, but its main formation is identical.Name for girder and secondary beam mainly is to decide with the residing when mounted position of precast beam.Below embodiment girder and secondary beam when setting forth all refer to the pre-erection of girder and secondary beam, when relating to the different structure of girder and secondary beam during elaboration below, explain respectively.
Referring to Fig. 3 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, 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 improves the overall performance of structure.
Referring to Fig. 3, Fig. 4 and Fig. 7, 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, has improved safety.Certainly, said upper steel twisted wire 21 also can be high-tensile steel wires.
Referring to Fig. 1 to Fig. 4, Fig. 8 to Figure 11; In the foregoing description that the present invention provides; The present invention is provided with shaped steel 3 in two ends of the beam body 1 of the precast beam of girder and secondary beam; Connector when this shaped steel 3 is installed as beam body 1 makes can place when beam body 1 is installed in the early stage with outside to be connected, and installation rate is accelerated greatly.This locates so-called outside can be post or other the beam body and other members that are used to bear this precast beam.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 can be channel-section steel, steel plate, angle steel or i iron.
Referring to Fig. 1 to Fig. 4, in the foregoing description that the present invention provides, the shaped steel 3 on the precast beam of said secondary beam is arranged on the top of beam body 1 end; It is a steel rod elements; When mounted, this steel rod elements plays the effect of shelving, and can be shelved on the top of the precast beam of girder.Satisfy secondary beam and be shelved on the requirement on the girder, thereby make things convenient for the lifting of secondary beam.
Referring to Fig. 8 to Figure 11, the shaped steel 3 on the said in the present invention girder is that the end face from precast beam stretches out, and is placed on said beam body 1 outer said shaped steel 3 and is provided with bolt hole 31 and/or is suitable for the perforation 32 that the outside column stirrup is walked.Said bolt hole 31 can be used for being connected with outside connected node, 32 is used for the prick post stirrup and bore a hole, and is beneficial to laying of tie muscle.After accomplishing whole watering,, make shaped steel become the shear key of the old and new's concrete bonding surface because shaped steel is connected with external member.
Referring to Fig. 8 to Figure 11, in the foregoing description that the present invention provides, the part that said shaped steel 3 is placed on said beam body 1 accounts for the 1/3-1/2 of the whole length of shaped steel, and present embodiment is 1/3.This scope setting can guarantee the bonding strength of shaped steel 3 and beam body 1, guarantees the bonding strength with external member simultaneously.The said shaped steel 3 that is embedded in the beam body 1 is step, under the prerequisite that does not influence bonding strength, the consumption of shaped steel is reduced.The shaped steel 3 of this kind form mainly is the requirement that is used to satisfy girder, is beneficial to girder and is connected with post.
Referring to Fig. 1 to Fig. 4, in the foregoing description that the present invention provides, the present invention is provided with a nib 4 on two 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 carrying out synchronously and the construction equipment operation of other operations, improved the construction speed in house.
Referring to Fig. 1 and 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. 1 and Fig. 6, in the foregoing description that the present invention provides, the diameter a of said nib 4 is 2cm-8cm, can elect 2cm, 4cm, 5cm, 6cm, 8cm as.The setting of said nib 4 can not be too big, if too big then be unfavorable for the installation of template assembly.Spacing c between adjacent said the nib 4 is 80cm-200cm, can elect 80cm, 90cm, 100cm, 110cm, 120cm, 160cm, 180cm, 200cm as, and the selection of this spacing can guarantee the intensity that whole template supports.The distance b of the end face of the center of said nib 4 and said beam body 1 is 8cm-20cm.Can elect 8cm, 10cm, 13cm, 15cm, 17cm, 20cm as.Said nib 4 can not be too near from the end face of beam body 1, if too near then can influence the flexural strength of construction stage beam body 1.
Referring to Fig. 1 and Fig. 3, 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 outside reinforcing bar 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 member, and it can bending avoid external member.Referring to Figure 11, the degree of depth L1 of said breach 12 is 50mm-150mm.Present embodiment is 100mm.This breach is a small gap, and this small gap can satisfy the crooked needed space of steel strand trace.The stirrup in the beam body 1 can be effectively avoided in the setting of above-mentioned size, in order to avoid stirrup spacing impacts in 12 pairs of beam bodies of this breach 1.This small gap scheme mainly is arranged on the end of girder.Referring to Fig. 6, and concern that to the installation of secondary beam and girder the steel strand of secondary beam need a bigger curved space, could guarantee that the steel strand of secondary beam stretch in the girder, realize both effective connections.Therefore, during to secondary beam, the degree of depth L2 of said breach is 200mm-400mm, and present embodiment is 300mm, is called big breach again.
Referring to Fig. 3 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. 3 and Fig. 7, the present invention buries sleeve pipe 5 underground in the end of said beam body 1, makes part bottom steel strand 2 pass sleeve pipe 5.Sleeve pipe 5 is set, and when the production phase, can to effectively reduce the local prestressing force of beam end of body excessive, eliminates and should produce the crack in the place, owing to can reduce the recurvation square of beam end of body, makes the pre-tensile stress of end upper surface of beam body reduce, thereby prevent to produce the crack.And,, can prevent that beam end of body bottom concrete is destroyed less than the compressive strength of concrete after the compressive stress stack that negative moment of backing plate feasible and beam produces because the compressive pre-stress that the bottom, end of beam body produces is discharged by sleeve portion in operational phase.
Two ends at beam body 1 in the present embodiment all are provided with sleeve pipe 5, thereby eliminate 2 pairs of destructions that concrete caused of bottom steel strand of two ends of beam body.Make precast beam of the present invention to use, enlarged the scope of application in the earthquake zone.
Referring to Fig. 3 and Fig. 7, in the foregoing description that the present invention provides, said sleeve pipe 5 is a plastic bushing, the sleeve structure that perhaps is wrapped to form by outsourcing material.The quantity that is with the bottom steel strand 2 of said sleeve pipe 5 is less than sum, and promptly not all bottom steel strand 2 all are with sleeve pipe.In order to satisfy requirement of the present invention, the quantity of sleeve pipe 5 can be the 1/3-2/3 of steel strand quantity, and present embodiment then 2 two ends in four bottom steel strand 2 is provided with sleeve pipe 5.
Referring to Fig. 4, in the foregoing description that the present invention provides, the said bottom steel strand 2 that are with sleeve pipe 5 on the width of said beam body 1 with the center line symmetric arrangement.Above-mentioned setting can guarantee the left and right sides stress balance of beam body 1, can not produce beam body 1 unbalance stress.
Referring to Fig. 3 and Fig. 7, in the foregoing description that the present invention provides, the total length of said sleeve pipe 5 is the 5%-15% of the total length of said beam body 1.The length of said sleeve pipe 5 is excessive; Then can influence the prestressing force that beam body 1 is had; Too shortly then can not eliminate the destruction of end steel strand 2 for concrete preferably, therefore, the 5%-15% that sleeve pipe 5 total lengths at two ends is limited to the total length of beam body 1 can be good at addressing the above problem.Present embodiment is 7%.
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; And the part of said stirrup is stretched out the upper surface of said beam body, it is characterized in that: at least one end of said beam body is provided with and is suitable for the shaped steel that is connected with external structure, and the part of said shaped steel is embedded in the said beam body; Remainder is placed on the end of said beam body, is vertically arranged with a plurality of nibs at least one sidewall of said beam body.
2. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1, it is characterized in that: said steel strand are embedded in the bottom of said beam body, and the top of said beam body also is embedded with prestressed high strength steel wire or the steel strand that adopt the pre-tensioning system construction.
3. 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.
4. 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.
5. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1 is characterized in that: be placed on the external said shaped steel of said beam and be provided with bolt hole and/or be suitable for the perforation that the outside column stirrup is walked.
6. 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 formed with breach in said steel strand extending area; The degree of depth of said breach is 50mm-150mm, or the degree of depth of said breach is 200mm-400mm.
7. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1; It is characterized in that: the nib of all on the said beam body is positioned on the same horizon; Said nib is through hole or blind hole; The diameter of said nib is 2cm-8cm, and the spacing between adjacent said the nib is 80cm-200cm, the end face 8cm-20cm of the said beam body of the centre distance of said nib.
8. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 2, it is characterized in that: the said bottom of part steel strand are with sleeve pipe at least, and said sleeve pipe is embedded in the end of said beam body.
9. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1 is characterized in that: the end that is embedded in the shaped steel in the said beam body is a step.
10. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1 is characterized in that: said bottom steel strand adopt the pre-tensioning system construction to be embedded in the said beam body, and the quantity of said bottom steel strand is the 3-18 root.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010297701.8A CN102418402B (en) | 2010-09-28 | 2010-09-28 | Pre-tensioned prestressed reinforced concrete precast beam |
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| CN201010297701.8A CN102418402B (en) | 2010-09-28 | 2010-09-28 | Pre-tensioned prestressed reinforced concrete precast beam |
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| CN102418402A true CN102418402A (en) | 2012-04-18 |
| CN102418402B CN102418402B (en) | 2014-04-09 |
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| CN103233537A (en) * | 2013-04-27 | 2013-08-07 | 杨众 | Heavy-load superimposed overhead terrace and construction method |
| CN108532835A (en) * | 2018-03-21 | 2018-09-14 | 河海大学 | A kind of pre-tension prestressed concrete beam longitudinal cracking restraining device and its construction method |
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| CN108532835B (en) * | 2018-03-21 | 2021-04-27 | 河海大学 | Longitudinal cracking restraining device for pre-tensioned prestressed concrete beam and construction method thereof |
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| CN102418402B (en) | 2014-04-09 |
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