CN201794215U - Pretensioning method prestress reinforced concrete prefabricated beam - Google Patents
Pretensioning method prestress reinforced concrete prefabricated beam Download PDFInfo
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- CN201794215U CN201794215U CN 201020553624 CN201020553624U CN201794215U CN 201794215 U CN201794215 U CN 201794215U CN 201020553624 CN201020553624 CN 201020553624 CN 201020553624 U CN201020553624 U CN 201020553624U CN 201794215 U CN201794215 U CN 201794215U
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Abstract
The utility model relates to a pretensioning method prestress reinforced concrete prefabricated beam, which is characterized in that the prefabricated beam comprises a beam body and a prestress steel strand, wherein the prestress steel stand is buried in the beam body to be used as a main bar, the beam body is provided with a hoop bar, a part of the hoop bar extends out of the upper surface of the beam body, at least one end part of the beam body is provided with sectional steel suitable for being connected with an external structure, a part of the sectional steel is buried in the beam body, and the rest part is exposed out of the end part of the beam body. The utility model belongs to the prefabricated beam adopting the pretensioning method prestress steel strand as the main bar. Through the adoption of the prestress steel strand, the utility model ensures that under the condition of the same intensity, the steel consumption of the main bar can be reduced, the steel strand can freely realize elastic bending, and the installation of the beam can be much more convenient. The sectional steel is arranged at the end part of the prefabricated beam, the utility model is favorable for the installation of the prefabricated beam, the sectional steel is used as a new and old concrete combining anti-shearing key, and is also used as an installation placing component of the post or the beam.
Description
Technical field
The utility model relates to a kind of precast beam, relates 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 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, occurred some in the prior art and be intended to solve the scheme of local problem.For example Chinese patent application number is CN200810030491.9, open mouthful is on July 9th, 2008, a kind of compound beam is disclosed, 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, the manufacturing cost height, 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.
The utility model content
Technical problem to be solved in the utility model 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.
A kind of pretensioned prestressing steel bar concrete precast beam that provides according to the utility model, comprise that Liang Tihe is embedded in the described beam body prestress wire as main muscle, described beam body is provided with stirrup, the part of described stirrup is stretched out the upper surface of described beam body, at least one end of described beam body is provided with and is suitable for the shaped steel that is connected with external structure, the part of described shaped steel is embedded in the described beam body, and remainder is placed on the end of described beam body.
A kind of pretensioned prestressing steel bar concrete precast beam that provides according to the utility model also has following attached technical characterictic:
Described shaped steel is channel-section steel, steel plate, angle steel or i iron.
The part that described shaped steel is placed on described beam body accounts for the 1/3-1/2 that puts in order length.
Be vertically arranged with a plurality of nibs on the sidewall of described beam body, all nibs are positioned on the same horizon.
The end of described steel strand has enlarged footing.
Being placed on the external described shaped steel of described beam is provided with bolt hole and/or is suitable for the perforation that the outside column stirrup is walked.
The end of described beam body is formed with breach in described steel strand extending area, and the degree of depth of described breach is 50mm-150mm.
Described steel strand are embedded in the bottom of described beam body, and the top of described beam body also is embedded with prestressed high strength steel wire or the steel strand that adopt the pre-tensioning system construction.
Be with sleeve pipe to the described bottom of small part steel strand, described sleeve pipe is embedded in the end of described beam body.
The end of described beam body is embedded with pectination net sheet at described bottom steel strand extension, and the bending of described net sheet is shaped, and inserts in the space between the described steel strand.
A kind of pretensioned prestressing steel bar concrete precast beam that provides according to the utility model compared with prior art has following advantage: at first, the utility model is a kind of precast beam that adopts the pretensioned prestressing steel strand as main muscle, adopt prestress wire can guarantee to have under the situation of same intensity, reduce the steel using amount of main muscle, steel strand are elastic buckling more freely, make things convenient for the installation of beam greatly, 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 utility model is provided with shaped steel in the end of precast beam, is beneficial to the installation of precast beam, and this shaped steel double as is that the old and new's concrete is in conjunction with shear key, again as shelving member with the installation of post or beam; Once more, beam body end formed jagged, slot milling when this breach is the steel strand bending, 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 in the indentation, there bending, 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 a front view of the present utility model.
Fig. 2 is a stereogram of the present utility model.
Fig. 3 is an internal construction schematic diagram of the present utility model.
Fig. 4 is that sectional view is looked on a left side, end of the present utility model, the structure of the net of pectination shown in figure sheet.
Fig. 5 is an end of the present utility model enlarged drawing.
Fig. 6 is an inner end portion structure enlarged drawing of the present utility model.
Fig. 7 is the front view of another embodiment of the present utility model.
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 at the utility model, comprise beam body 1 and be embedded in the described beam body 1 prestress wire 2 as main muscle, described beam body 1 is provided with stirrup 11, the part of described stirrup 11 is stretched out the upper surface of described beam body 1, at least one end of described beam body 1 is provided with and is suitable for the shaped steel 3 that is connected with external structure, the part of described shaped steel 3 is embedded in the described beam body 1, and remainder is placed on the end of described beam body 1.
The so-called steel strand 2 of the utility model adopt many braided steel wires to form, this kind steel strand 2 intensity height, and good toughness, after adopting pre-tensioning system to stretch, the concrete of beam body can produce higher prestressing force.Beam body 1 of the present utility model 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 also superimposed beam of beam of twice construction.
Referring to Fig. 1 to Fig. 4, in the foregoing description that the utility model provides, described steel strand 2 adopt the pre-tensioning system construction to be embedded in the described beam body 1, and the quantity of described 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, saved 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.
Referring to Fig. 1 and Fig. 5, in the foregoing description that the utility model provides, 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 improve the anchoring property of steel strand greatly, thereby improve the overall performance of structure.
Referring to Fig. 1 to Fig. 3, and Fig. 6, in the foregoing description that the utility model provides, 4 described steel strand 2 are embedded in the bottom of described beam body 1, and the top of described beam body 1 also is embedded with 2 prestress wires 21 that adopt the pre-tensioning system construction.4 steel strand are used to make precast beam to produce prestressing force in the utility model middle and lower part, 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 producing the crack when bottom steel strand 2 are put.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.Described spiral hoop 22 strengthens the local strength of its position, thereby can eliminate the destruction of 21 pairs of concrete parts of upper steel twisted wire.Certainly, described upper steel twisted wire 21 also can be high-tensile steel wires.
Referring to Fig. 1 to Fig. 3, and Fig. 5, in the foregoing description that the utility model provides, the utility model is provided with shaped steel 3 in two ends of beam body 1, connector when this shaped steel 3 is installed as beam body 1, make to be placed on the external member when beam body 1 is installed in the early stage, installation rate is accelerated greatly.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 utility model can be channel-section steel, steel plate, angle steel or i iron.
Referring to Fig. 5 and Fig. 6, in the foregoing description that the utility model provides, be placed on described beam body 1 outer described shaped steel 3 and be provided with bolt hole 31 and/or be suitable for the perforation 32 that the outside column stirrup is walked.Described 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 finishing 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. 6, in the foregoing description that the utility model provides, the part that described shaped steel 3 is placed on described 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 described 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.
Referring to Fig. 1 and Fig. 5, in the foregoing description that the utility model provides, 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 utility model are positioned at the bottom of described 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 utility model is provided with breach 12 in steel strand 2 extending areas, and steel strand 2 trace in breach 12 is crooked, thereby makes steel strand when colliding with outside reinforcing bar, and it can bending avoid outside reinforcing bar.The degree of depth L1 of described breach 12 is 50mm-150mm.Specifically can elect 50mm, 75mm, 100mm as.This breach can satisfy the crooked needed space of steel strand trace.
Referring to Fig. 3, Fig. 4 and Fig. 6, in the foregoing description that the utility model provides, the root of described breach 12 is embedded with pectination net sheet 13, and described net sheet is converted into shape by the single steel bar Curved Continuous, and inserts in the space between the described steel strand 2.In the foregoing description that the utility model provides, because bottom steel strand 2 produce local failure to beam body concrete when putting, described 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.The net sheet is bent into pectination, and in the space between the insertion 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, Fig. 4 and Fig. 6, the utility model is buried sleeve pipe 5 underground in the end of described beam body 1, makes part bottom steel strand 2 pass sleeve pipe 5.Sleeve pipe 5 is set, and can to effectively reduce the local prestressing force of beam end of body when the production phase excessive, eliminates this place and produce the crack, 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.Described sleeve pipe 5 is a plastic bushing, perhaps the sleeve structure that is wrapped to form by outsourcing material.The quantity that is with the bottom steel strand 2 of described 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 utility model, 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. 7, in another embodiment that the utility model provides, primary structure is same as the previously described embodiments, the main distinction is, be provided with a nib 4 in the both sides of beam body 1, described 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 by 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 the flooring spaciousness, be beneficial to other operations carry out synchronously move with construction equipment.
Referring to Fig. 7, in the foregoing description that the utility model provides, the nib 4 of all on the described beam body 1 is positioned on the same horizon, and described 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.Described 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.
Claims (10)
1. pretensioned prestressing steel bar concrete precast beam, it is characterized in that: comprise that Liang Tihe is embedded in the described beam body prestress wire as main muscle, described beam body is provided with stirrup, the part of described stirrup is stretched out the upper surface of described beam body, at least one end of described beam body is provided with and is suitable for the shaped steel that is connected with external structure, the part of described shaped steel is embedded in the described beam body, and remainder is placed on the end of described beam body.
2. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1, it is characterized in that: described shaped steel is channel-section steel, steel plate, angle steel or i iron.
3. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1 is characterized in that: the part that described shaped steel is placed on described beam body accounts for the 1/3-1/2 that puts in order length.
4. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1 is characterized in that: be vertically arranged with a plurality of nibs on the sidewall of described beam body, all nibs are positioned on the same horizon.
5. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1, it is characterized in that: the end of described steel strand has enlarged footing.
6. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1 is characterized in that: be placed on the external described shaped steel of described beam and be provided with bolt hole and/or be suitable for the perforation that the outside column stirrup is walked.
7. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1, it is characterized in that: the end of described beam body is formed with breach in described steel strand extending area, and the degree of depth of described breach is 50mm-150mm.
8. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 1, it is characterized in that: described steel strand are embedded in the bottom of described beam body, and the top of described beam body also is embedded with prestressed high strength steel wire or the steel strand that adopt the pre-tensioning system construction.
9. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 8 is characterized in that: be with sleeve pipe to the described bottom of small part steel strand, described sleeve pipe is embedded in the end of described beam body.
10. a kind of pretensioned prestressing steel bar concrete precast beam as claimed in claim 8 is characterized in that: the end of described beam body is embedded with pectination net sheet at described bottom steel strand extension, and the bending of described net sheet is shaped, and inserts in the space between the described steel strand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020553624 CN201794215U (en) | 2010-09-28 | 2010-09-28 | Pretensioning method prestress reinforced concrete prefabricated beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020553624 CN201794215U (en) | 2010-09-28 | 2010-09-28 | Pretensioning method prestress reinforced concrete prefabricated beam |
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| Publication Number | Publication Date |
|---|---|
| CN201794215U true CN201794215U (en) | 2011-04-13 |
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| CN 201020553624 Expired - Lifetime CN201794215U (en) | 2010-09-28 | 2010-09-28 | Pretensioning method prestress reinforced concrete prefabricated beam |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103498531A (en) * | 2013-10-22 | 2014-01-08 | 湖北弘毅建设有限公司 | Long-span pre-stressing I-shaped steel reinforced concrete superposed beam |
| CN108755929A (en) * | 2018-06-22 | 2018-11-06 | 重庆大学 | A kind of assembled pre-tensioned prestressed concrete frame and its construction technology |
| CN109680874A (en) * | 2019-02-15 | 2019-04-26 | 姚攀峰 | A kind of precast concrete shear connector, self-bearing type prefabricated components and preparation method thereof |
-
2010
- 2010-09-28 CN CN 201020553624 patent/CN201794215U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103498531A (en) * | 2013-10-22 | 2014-01-08 | 湖北弘毅建设有限公司 | Long-span pre-stressing I-shaped steel reinforced concrete superposed beam |
| CN108755929A (en) * | 2018-06-22 | 2018-11-06 | 重庆大学 | A kind of assembled pre-tensioned prestressed concrete frame and its construction technology |
| CN109680874A (en) * | 2019-02-15 | 2019-04-26 | 姚攀峰 | A kind of precast concrete shear connector, self-bearing type prefabricated components and preparation method thereof |
| CN109680874B (en) * | 2019-02-15 | 2023-05-12 | 姚攀峰 | Precast concrete shear connector, self-supporting precast element and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Free format text: FORMER OWNER: HUAHUI ENGINEERING DESIGN GROUP CO., LTD. Effective date: 20120801 Owner name: HUAHUI ENGINEERING DESIGN GROUP SHARES CO., LTD. Free format text: FORMER OWNER: YANG FENG Effective date: 20120801 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120801 Address after: 312000 Zhejiang Province, Shaoxing Zhongxing Road No. 339 building Huahui Changan Patentee after: Huahui Engineering Design Group Co., Ltd. Address before: 312000 Zhejiang Province, Shaoxing Zhongxing Road No. 339 building Huahui Changan Co-patentee before: Huahui Engineering Design Group Co., Ltd. Patentee before: Yang Feng |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110413 |