CN102852276A - Large-tonnage prestressed superposed crane beam and construction method - Google Patents
Large-tonnage prestressed superposed crane beam and construction method Download PDFInfo
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- CN102852276A CN102852276A CN201210289249XA CN201210289249A CN102852276A CN 102852276 A CN102852276 A CN 102852276A CN 201210289249X A CN201210289249X A CN 201210289249XA CN 201210289249 A CN201210289249 A CN 201210289249A CN 102852276 A CN102852276 A CN 102852276A
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Abstract
The invention discloses a large-tonnage prestressed superposed crane beam, which comprises an inverted T-shaped precast beam part and a T-shaped cast-in concrete part, wherein the two parts are combined to form an I-shaped crane beam; and the large-tonnage prestressed superposed crane beam is characterized in that the inverted T-shaped precast beam part comprises a web plate, wherein the web plate and the bottom flange are uniform sections along the longitudinal direction; a pre-tensioning method prestressed steel strand is longitudinally buried in the beam body; a stirrup is buried in the web plate of the beam body; the stirrup is exposed out of the upper surface of the web plate for a certain length and is buried in the cast-in concrete part; a shear-resistant piece is connected to the joint surface of a precast part and the cast-in-situ part. The inverted T-shaped uniform-section prestressed precast part is manufactured by a long line method in a factory, the die is a standard universal template, the template is low in distribution expense and convenient to manufacture, and because a bottom die is not required on the cast-in-situ part on a construction site, the die is particularly convenient to erect.
Description
Technical field
The present invention relates to a kind of crane girder of factory building, relate in particular to a kind of Reinforced Concrete Crane Beam that the factory building of large tonnage crane is arranged.
Background technology
At present the large tonnage crane beam adopts steel crane beam usually, and its steel using amount is large, cost is high, fire prevention, antirust, antiseptic property is poor.And the common employing of prestressed reinforced concrete crane girder is post-stressed, and the trammel lattice are many, and are highly large, and it is complicated that it makes used structure of transvers plate, and versatility is poor, and distributing bar that beam is joined is many, steel using amount is large, complicated construction technique, and speed of application is slow, and cost is higher.Also have when the crane brake weight is larger, also need establish the moving beam of horizontal steel, increase cost.The superimposed crane girder of the pretensioned prestressing that a kind of cost is low has no report.
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 cost province, fire prevention, antirust, antiseptic property good and the superimposed car beam of the large-tonnage prestressing force of easy construction and job practices.
According to the superimposed crane girder of a large-tonnage prestressing force provided by the invention and job practices, comprise invertible T-shaped precast beam part and T shape rear pouring concrete part, two parts are combined to form I font crane girder.Described invertible T-shaped precast beam comprises that web and bottom flange are uniform section longitudinally, vertically are embedded with the pretensioned prestressing steel strand in the beam body.Be embedded with stirrup in the beam body web, stirrup exposes web upper surface certain-length and imbeds in the rear pouring concrete part, and prefabricated and cast-in-place part bonding surface is associated with shearing-resistant member.
Also have following attached technical characterictic according to the superimposed crane girder of a large-tonnage prestressing force provided by the invention and job practices:
Described shearing-resistant member is the steel plate of longitudinally elongated setting, and the steel plate bottom is imbedded in the inverted T-shaped pre-erection web concrete, and upper part is embedded in the T shape rear pouring concrete web.
Described shearing-resistant member is for being embedded in across a certain distance mutually bar dowel or the angle steel in the inverted T-shaped Prefabricated Concrete, and shearing-resistant member waters the T shaped part and divides in the concrete perpendicular to the pre-erection upper surface after shearing-resistant member is imbedded.
Be embedded with some in the described beam body and fall parabolic total length cover the un-bonded prestressed steel strand of sleeve pipe is arranged, superimposed crane girder end face is exposed in the steel strand upper end, and at least one end steel strand end connection has ground tackle.
The 30-60cm length range web thickening of described end, thickness and lower flange of girder edge are with thick.
Described steel plate longitudinally is the broken line waveform, and steel plate is provided with some through holes.
The U-shaped reinforcing bar that certain-length is arranged is vertically exposed in the outside, described beam-ends top flange, and the U-shaped reinforcing bar vertically arranges, and openend is imbedded the beam-ends certain-length.
One side of described top flange is exposed every a determining deviation reinforcing bar, and reinforcing bar is partly imbedded in the beam body.
Described precast beam end web is horizontally embedded to have rectangle reinforcing bar, rectangle reinforcing bar to anchor in the rear pouring concrete of beam-ends thickening web.
The job practices of the superimposed crane girder of prestressing force is characterized in that, according to the following steps operation:
At least two buttresses are built on A, factory building columns limit by laying bricks or stones.
B, prefabricate prestressing force inverted T-shaped pre-erection is held on the buttress.
C, after water the T shaped part and divide and prick the muscle formwork
Support top adjustable seats under D, the pre-erection bottom flange
E, water and smash the T shaped part and divide concrete, reach stripping behind the some strength
F, concrete are removed adjustable seats after reaching an intensity
G, stretch-draw unbonded prestressing tendon and anchoring
Compared with prior art have following advantage according to the superimposed crane girder of a large-tonnage prestressing force provided by the invention and job practices: 1, the prismatic prestressing force pre-erection of inverted T-shaped of the present invention adopts long collimation method manufacturing in factory, mould adopts the standard universal template, the template amortization charge is low, easily manufactured, the cast-in-place part in building site is because need not bed die, and formwork is convenient especially.2, crane beam main tendon of the present invention all adopts presstressed reinforcing steel, and anti-fatigue performance is good, and steel using amount declines to a great extent, and cost reduces.3, Design of Crane Beam of the present invention is pressed not work with cracking of beam, and is the I-shaped cross-section, so the beam bending rigidity is large, deck-molding is little.4, little because of crane girder pre-erection of the present invention cross section, from heavy and light, so cost of transportation reduces.5, the old and new's concrete bonding surface is embedded with the horizontal shear strength that shear reinforcement or steel plate improve bonding surface greatly, and steel plate can also use as beam anti-shear spare, solve the problem of concrete thin web plate shear strength deficiency.6, bend up muscle because joining prestressing without bondn in the crane girder of the present invention, and pass through the old and new's concrete bonding surface, both solved the Inclined Cracking problem of crane girder, strengthened again the globality of beam.7, because of the cast-in-place time thickening web of crane beam end portion of the present invention, can solve the not enough problem of anti-pressure ability of the beam-ends on the bracket.8, walkway board adopts Cast-in-place concrete, and formwork is convenient, increases simultaneously side direction bending rigidity and the intensity of crane girder, has saved the level braking truss.
Description of drawings
Fig. 1 is front view of the present invention
Fig. 2 is the stereogram that the present invention adopts bar dowel shearing-resistant member precast beam
Fig. 3 is the stereogram that the present invention adopts steel plate shearing-resistant member precast beam
Fig. 4 is the stereogram of steel plate shearing-resistant member of the present invention
Fig. 5 is section and the arrangement of reinforcement of superposed beam of the present invention
Fig. 6 is section and the arrangement of reinforcement of pre-erection beam of the present invention
Fig. 7 is another section and the arrangement of reinforcement of pre-erection beam of the present invention
Fig. 8 is formwork sectional drawing of the present invention
Fig. 9 is pre-erection arrangement of reinforcement elevation of the present invention
Figure 10 is the arrangement of reinforcement elevation of superposed beam of the present invention
The specific embodiment
Referring to Fig. 1, Fig. 5 to Fig. 8, in the embodiment of the superimposed crane girder 1 of a kind of large-tonnage prestressing force that the present invention provides, comprise invertible T-shaped precast beam part 11 and T shape rear pouring concrete part 12, two parts are combined to form I font crane girder 1.Invertible T-shaped precast beam 11 comprises that web and bottom flange are uniform section longitudinally, vertically are embedded with pretensioned prestressing steel strand 2 in the beam body.Be embedded with stirrup 3 in the beam body web, stirrup 3 exposes web upper surface certain-length and imbeds in the rear pouring concrete part 12, and prefabricated and cast-in-place part bonding surface is associated with shearing-resistant member 41 or 42.Adopt superposed beam for making things convenient for inverted T-shaped prestressed member part prefabricated in batches in factory, have ready conditions the pretensioned prestressing technology that adopts, the Saving steel amount is eliminated fatigue problem to the stressed impact of crane girder.Prismatic inverted T-shaped pre-erection 11, can adopt easily the long collimation method production of universal mold, not only template amortization cost descends, and work efficiency significantly improves, be embedded in the stirrup that pours on the invertible T-shaped precast beam in the rear pouring concrete not only as the shearing-resistant member of the old and new's concrete bonding surface, satisfy simultaneously beam anti-shear requirement of strength, but not enough in order to remedy the old and new's concrete bonding surface shear strength, bonding surface is established shearing- resistant member 41 or 42 in addition.
Referring to Fig. 2 to Fig. 7, in above-described embodiment that the present invention provides, described shearing-resistant member 41 is the steel plate of longitudinally elongated setting, and the steel plate bottom is imbedded in the inverted T-shaped pre-erection 11 web concretes, and upper part is watered to smash and is embedded in T shape rear pouring concrete 12 webs.Described shearing-resistant member 42 is for being embedded in across a certain distance mutually bar dowel or the angle steel in the inverted T-shaped Prefabricated Concrete, and reinforcing bar waters the T shaped part and divides in the concrete perpendicular to the pre-erection upper surface after reinforcing bar is imbedded.Steel plate is both as the shearing-resistant member of the old and new's concrete bonding surface, strengthen the globality of superposed beam, simultaneously bear most of shearing as the anti-shear spare of superposed beam operational phase, make the web can attenuate, thereby alleviate the beam deadweight, and the old and new's concrete in conjunction with and embedded reinforcement or angle steel as shearing-resistant member, only for improving shear strength and the globality of the combination of the old and new's concrete.
Referring to Fig. 2, Fig. 3, Fig. 9, Figure 10, in above-described embodiment that the present invention provides, being embedded with some in the described beam body falls parabolic total length cover the un-bonded prestressed steel strand 5 of sleeve pipe is arranged, superimposed crane girder end face is exposed in the steel strand upper end, at least one end steel strand end connection has ground tackle 51, adopt un-bonded prestressed steel strand to be convenient to after rear pouring concrete reaches some strength, carry out prestressed stretch-draw, the steel strand of falling parabola can improve the anti-shear intensity of superimposed crane girder greatly, the control diagonal crack widths can improve the globality of the old and new's concrete combination simultaneously.
Referring to Fig. 1, in above-described embodiment that the present invention provides, the 30-60cm length range web thickening of described end, thickness and lower flange of girder edge are with thick, the web of superposed beam is thickeied when the beam-ends rear pouring concrete, be for precast beam part 11 is uniform section, make things convenient for the versatility of formwork and template, and the web of thickening be to satisfy the compressive strength requirement of beam-ends under the effect of crane wheel.
Referring to Fig. 1, in above-described embodiment that the present invention provides, the U-shaped reinforcing bar 7 that certain-length is arranged is vertically exposed in the outside, the described beam-ends edge of a wing, and U-shaped reinforcing bar 7 vertically arranges, and openend is imbedded the beam-ends certain-length.The U-shaped reinforcing bar also can make side direction become continuous beam except being linked to be the integral body after cast-in-place in order to strengthen adjacent beams intermediate node concrete, improves the lateral resistant ability of crane girder.
Referring to Fig. 1, in above-described embodiment that the present invention provides, a side of described top flange is exposed reinforcing bar 91, and reinforcing bar 91 parts are imbedded in the beam body.One side of top flange is reserved stirrup for after installing at crane girder, the edge of a wing is widened again, or is striden the crane girder In-situ cast concrete board that links to each other with the neighbour, and this plate has saved anti-side brake truss not only as walkway board but also can greatly improve the anti-side rigidity of crane girder.
Referring to Fig. 8, in the embodiment that the present invention provides, superposed beam is with the fixture of inverted T-shaped pre-erection as bed die and upper mould 10, in order to water inverted T-shaped concrete 12 behind the top, and divide into temporary supporting 9 at precast beam, make the construction stage precast beam substantially not produce moment of flexure, can reduce like this prestressing force of construction stage beam and decay to reduce deck-molding.
Claims (10)
1. superimposed crane girder of large-tonnage prestressing force, comprise invertible T-shaped precast beam part and T shape rear pouring concrete part, two parts are combined to form I font crane girder, it is characterized in that invertible T-shaped precast beam comprises that web and bottom flange are uniform section longitudinally, vertically are embedded with the pretensioned prestressing steel strand in the beam body.Be embedded with stirrup in the beam body web, stirrup exposes web upper surface certain-length and imbeds in the rear pouring concrete part, and prefabricated and cast-in-place part bonding surface is associated with shearing-resistant member.
2. superimposed crane girder is characterized in that described shearing-resistant member is the steel plate of longitudinally elongated setting as claimed in claim 1, and the steel plate bottom is imbedded in the inverted T-shaped pre-erection web concrete, and upper part is embedded in the T shape rear pouring concrete web.
3. superimposed crane girder is characterized in that described shearing-resistant member for being embedded in across a certain distance mutually bar dowel or the angle steel in the inverted T-shaped Prefabricated Concrete as claimed in claim 1, and shearing-resistant member waters the T shaped part and divides in the concrete perpendicular to the pre-erection upper surface after shearing-resistant member is imbedded.
4. superimposed crane girder as claimed in claim 1 is characterized in that being embedded with in the described beam body some and falls parabolic total length cover the un-bonded prestressed steel strand of sleeve pipe is arranged, superimposed crane girder end face is exposed in the steel strand upper end, and at least one end steel strand end connection has ground tackle.
5. superimposed crane girder as claimed in claim 1 is characterized in that the 30-60cm length range web thickening of described end, and thickness and lower flange of girder edge are with thick.
6. superimposed crane girder as claimed in claim 2 is characterized in that described steel plate longitudinally is the broken line waveform, and steel plate is provided with some through holes.
7. superimposed crane girder as claimed in claim 1 is characterized in that vertically exposing the U-shaped reinforcing bar that certain-length is arranged outside the described beam-ends top flange, and the U-shaped reinforcing bar vertically arranges, and openend is imbedded the beam-ends certain-length.
8. superimposed crane girder as claimed in claim 1 is characterized in that a side of described top flange exposes every a determining deviation reinforcing bar is arranged, and reinforcing bar is partly imbedded in the beam body.
9. superimposed crane girder is characterized in that described precast beam end web is horizontally embedded the rectangle reinforcing bar is arranged as claimed in claim 1, and the rectangle reinforcing bar anchors in the rear pouring concrete of beam-ends thickening web.
10. the job practices of the superimposed crane girder of prestressing force is characterized in that, according to the following steps operation:
At least two buttresses are built on A, factory building columns limit by laying bricks or stones.
B, prefabricate prestressing force inverted T-shaped pre-erection is held on the buttress.
C, after water the T shaped part and divide and prick the muscle formwork
Support top adjustable seats under D, the pre-erection bottom flange
E, water and smash the T shaped part and divide concrete, reach stripping behind the some strength
F, concrete are removed adjustable seats after reaching an intensity
G, stretch-draw unbonded prestressing tendon and anchoring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210289249.XA CN102852276B (en) | 2012-08-15 | 2012-08-15 | A kind of large-tonnage prestressing force overlapping crane girder and construction method |
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| CN201210289249.XA CN102852276B (en) | 2012-08-15 | 2012-08-15 | A kind of large-tonnage prestressing force overlapping crane girder and construction method |
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| CN102852276A true CN102852276A (en) | 2013-01-02 |
| CN102852276B CN102852276B (en) | 2016-08-24 |
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Cited By (7)
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| CN104458069A (en) * | 2014-12-23 | 2015-03-25 | 内蒙古包钢钢联股份有限公司 | Crane box type support bar stress test method |
| CN109868937A (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 soap-free emulsion polymeization, construction method |
| 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 |
| CN109868935A (en) * | 2017-12-05 | 2019-06-11 | 上海同吉建筑工程设计有限公司 | Post-tensioning has the prestressed concrete superposed beam and its design, construction method of bonding |
| CN109868938A (en) * | 2017-12-05 | 2019-06-11 | 上海同吉建筑工程设计有限公司 | The total tension prestress concrete composite beam and its design, construction method of post-tensioning soap-free emulsion polymeization |
| CN109868940A (en) * | 2017-12-05 | 2019-06-11 | 上海同吉建筑工程设计有限公司 | Post-tensioning has the total tension prestress concrete composite beam and its design, construction method of bonding |
| CN115370068A (en) * | 2022-09-27 | 2022-11-22 | 三峡大学 | Pre-tensioning-method-adopted prestressed BFRP rib T-shaped superposed beam and design method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104458069A (en) * | 2014-12-23 | 2015-03-25 | 内蒙古包钢钢联股份有限公司 | Crane box type support bar stress test method |
| CN109868937A (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 soap-free emulsion polymeization, construction method |
| 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 |
| CN109868935A (en) * | 2017-12-05 | 2019-06-11 | 上海同吉建筑工程设计有限公司 | Post-tensioning has the prestressed concrete superposed beam and its design, construction method of bonding |
| CN109868938A (en) * | 2017-12-05 | 2019-06-11 | 上海同吉建筑工程设计有限公司 | The total tension prestress concrete composite beam and its design, construction method of post-tensioning soap-free emulsion polymeization |
| CN109868940A (en) * | 2017-12-05 | 2019-06-11 | 上海同吉建筑工程设计有限公司 | Post-tensioning has the total tension prestress concrete composite beam and its design, construction method of bonding |
| CN109868937B (en) * | 2017-12-05 | 2021-11-05 | 上海同吉建筑工程设计有限公司 | Post-tensioned unbonded prestressed concrete composite beam and design and construction method thereof |
| CN109868935B (en) * | 2017-12-05 | 2022-01-07 | 上海同吉建筑工程设计有限公司 | Post-tensioned bonded prestressed concrete composite beam and design and construction method thereof |
| CN109868940B (en) * | 2017-12-05 | 2022-01-14 | 上海同吉建筑工程设计有限公司 | Post-tensioned bonded co-tensioned prestressed concrete composite beam and design and construction method thereof |
| CN109868938B (en) * | 2017-12-05 | 2022-02-01 | 上海同吉建筑工程设计有限公司 | Post-tensioned unbonded co-tensioned prestressed concrete composite beam and design and construction method thereof |
| CN115370068A (en) * | 2022-09-27 | 2022-11-22 | 三峡大学 | Pre-tensioning-method-adopted prestressed BFRP rib T-shaped superposed beam and design method thereof |
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| CN102852276B (en) | 2016-08-24 |
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