CN102909786B - Construction technology for prefabricating concrete crane beam - Google Patents
Construction technology for prefabricating concrete crane beam Download PDFInfo
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- CN102909786B CN102909786B CN201210476209.6A CN201210476209A CN102909786B CN 102909786 B CN102909786 B CN 102909786B CN 201210476209 A CN201210476209 A CN 201210476209A CN 102909786 B CN102909786 B CN 102909786B
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- pedestal
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Abstract
The invention relates to a construction technology for prefabricating a concrete crane beam. The construction technology comprises reinforced bar manufacturing and installing, embedded part installing, molding board installing, concrete casting and concrete curing. A bottom die for prefabricating the concrete crane beam is a concrete pedestal, and machined crane beam reinforced bars are arranged on the pedestal. Embedded parts on the bottom side of the crane beam are placed and fixed on the concrete pedestal before the reinforced bars are installed; the embedded parts on the side faces of the crane beam are firstly fixed at the corresponding positions of a side die by using screws and then are installed in place together with the side die; the side die is a bamboo plywood board; and the side die is fixed by using a screw rod jack and a steel pipe support rack. The concrete is fed in a bin by using a concrete pump truck and is vibrated by a small-diameter plug-type vibrator. After the demolding of the crane beam, the concrete is cured through watering. The construction technology is convenient to construct and operate, the springing of the crane beam can be accurately controlled, the embedded parts are embedded accurately in position, and the prefabricated concrete crane beam is attractive in appearance.
Description
Technical field
The invention belongs to industrial building field, be specifically related to a kind of concrete crane beam prefabricating and constructing.
Background technology
At present, the most of precast concrete crane girder that adopts of crane girder of thermal power plant and other industrial premises, the conventional prefabricated employing combined steel formwork of concrete crane beam, steel pipe frame supports the method with Screw arbor with nut at both-ends fixed Combination steel form, the concrete crane beam outward appearance precasting is like this not attractive in appearance, built-in fitting out-of-flatness on concrete crane beam, or can not find built-in fitting after the concrete crane beam demoulding.
Summary of the invention
The object of the invention is to overcome the deficiency of current conventional precast concrete crane girder technique, provide that a kind of construction cost is low, template is easy for installation, the concrete crane beam prefabricating and constructing of built-in fitting fixation, reliable construction quality.
Technical scheme of the present invention is: comprise the following steps: reinforcing bar peace processed, installation of embedded parts, template installation, concreting, concrete curing;
1) reinforcing bar system peace: concrete crane beam framework of steel reinforcement is colligation on concrete pedestal directly;
2) installation of embedded parts: first place at the bottom of concrete crane beam beam built-in fitting in the relevant position of pedestal end face, built-in fitting dowel is welded on crane girder framework of steel reinforcement, the built-in fitting of crane girder side is screwed relevant position inside side template, along with side template together installation in position, U-bolt is installed before side form is installed, the suspension ring of concrete crane beam adopt without cold drawn I level hot-rolled reinforced bar and make, and each root crane girder arranges two suspension ring, is reserved in respectively crane girder 1/4 place;
3) template is installed: concrete crane beam bed die adopts concrete pedestal, and pedestal end face raises into arch face, and with high strength blind bamboo plywood coated with film, as side template, side template adopts steel pipe screw mandrel jacking level fixing to supportting;
4) adopt concrete automobile pump that concrete distributing is put in storage, use poker vibrator vibrated concrete;
5) with the maintenance crane girder concrete of directly sprinkling water, remain that concrete surface is moistening, curing time is no less than 14 days.
The present invention has the following advantages compared with the prior art: constructing operation is convenient, can accurately control the arch camber of crane girder, and built-in fitting position is buried underground precisely, the concrete crane beam good looking appearance precasting.Improve efficiency of construction, reduced construction cost.
accompanying drawing explanation
Fig. 1 is that the prefabricated master of concrete crane beam of the present invention looks schematic diagram.
Fig. 2 is the prefabricated schematic side view of concrete crane beam of the present invention.
Fig. 3 is the prefabricated horizontal layout schematic diagram of concrete crane beam of the present invention.
In figure: 1-concrete pedestal, 2-side template, the vertical back cord of 3-, the horizontal back cord of 4-, 5-screw mandrel jacking, 6-horizontal support steel pipe, the vertical vertical rod in 7-steel pipe frame middle part, the vertical vertical rod of 8-steel pipe frame surrounding, 9-steel pipe frame horizontal cross bar, 10-U type bolt, 11-concrete crane beam.
The specific embodiment
Select a smooth area to be not less than 600m
2place (and place has a good transport service to the plant building that concrete crane beam is installed).The pouring concrete sclerosis of the prefabricated place of concrete crane beam, concreting thickness is 20cm.Some concrete pedestals 1 are built in place in sclerosis, concrete pedestal (namely concrete crane beam bed die) is arranged and is seen Fig. 3, between pedestal and pedestal, centre-to-centre spacing is 4m, pedestal length and width are identical with the length and width of concrete crane beam bottom surface, pedestal lowest part height is not less than 30cm, and pedestal end face is constructed into arch face (sagitta be pedestal length 3 ‰) along its length.At prefabricated place maturing and pedestal concrete, reach after the 28 day length of time; with slate pencil, on pedestal, mark crane girder bottom steel bar stress and stirrup position; the placement cushion block of concrete bar protective layer that keeps at a certain distance away on pedestal is installed manufactured crane girder reinforcing bar on pedestal.At the bottom of concrete crane beam beam, built-in fitting is first placed on the relevant position of pedestal end face, built-in fitting dowel is welded on crane girder framework of steel reinforcement, the built-in fitting of crane girder side is first fixed on side template 2 relevant positions, inner side, along with side template together installation in position, the U-bolt 10 of crane girder is installed (with ∠ 30 * 4 angle bar frames, being welded and fixed U-bolt) before side form is installed, the suspension ring of concrete crane beam adopt without cold drawn I level hot-rolled reinforced bar and make, and each root crane girder arranges two suspension ring, be reserved in respectively crane girder 1/4 place.After crane girder tie with reinforcing bar, start side form and install.Side form adopts high strength blind bamboo plywood coated with film (thick 18mm), the vertical back cord 3 of side template arranged outside, vertical back cord (5 * 8cm wood a tree, used in making timber for boats) spacing is 50cm, with long iron nail, vertical back cord is fixed on side form, be close to vertical back cord lateral surface and arrange horizontal back cord 4, laterally back cord spacing is 60cm.Side form adopts steel pipe frame (outer diameter of steel pipes is 48mm, wall thickness 3.5mm), screw mandrel jacking 5 levels fixing to supportting.Steel pipe frame comprises horizontal support steel pipe 6, the vertical vertical rod 7 in steel pipe frame middle part, the vertical vertical rod 8 of steel pipe frame surrounding, steel pipe frame horizontal cross bar 9.After side form installs, check installation location (center line, the top mark high) precision of U-bolt, after positioning precision meets design requirement, the support welding of U-bolt on crane girder framework of steel reinforcement, and check the perpendicularity of side form, adjust screw mandrel jacking and reinforce after firm side template, start to build crane girder concrete.Concrete adopts concrete mixer cloth to put in storage, minor diameter (φ 30) poker vibrator vibrated concrete.Crane girder concreting starts form removal after complete 7 days, and after crane girder form removal, side adopts plastic sheeting to hide.The concrete maintenance of crane girder adopts directly watering maintenance, and maintenance work is undertaken by special messenger, remains that concrete surface is moistening, and curing time is no less than 14 days.
Claims (5)
1. a concrete crane beam prefabricating and constructing, is characterized in that comprising the following steps: reinforcing bar peace processed, installation of embedded parts, template installation, concreting, concrete curing;
1) reinforcing bar system peace: concrete crane beam framework of steel reinforcement is colligation on concrete pedestal directly;
2) installation of embedded parts: first place at the bottom of concrete crane beam beam built-in fitting in the relevant position of pedestal end face, built-in fitting dowel is welded on crane girder framework of steel reinforcement, the built-in fitting of crane girder side is screwed relevant position inside side template, along with side template together installation in position, U-bolt is installed before side form is installed, and the suspension ring of concrete crane beam adopt without cold drawn I level hot-rolled reinforced bar and make;
3) template is installed: concrete crane beam bed die adopts concrete pedestal, and pedestal end face raises into arch face, and with high strength blind bamboo plywood coated with film, as side template, side form adopts steel pipe frame, screw mandrel jacking level fixing to supportting;
4) adopt concrete automobile pump that concrete distributing is put in storage, use poker vibrator vibrated concrete;
5) with the maintenance crane girder concrete of directly sprinkling water, remain that concrete surface is moistening, curing time is no less than 14 days.
2. concrete crane beam prefabricating and constructing according to claim 1, is characterized in that each root crane girder arranges two suspension ring, is reserved in respectively crane girder 1/4 place.
3. concrete crane beam prefabricating and constructing according to claim 1, is characterized in that the placement cushion block of concrete bar protective layer that keeps at a certain distance away on pedestal.
4. concrete crane beam prefabricating and constructing according to claim 1, it is characterized in that side form adopts the high strength blind bamboo plywood coated with film of thick 18mm, the vertical back cord of side template arranged outside, vertical back cord spacing is 50cm, be close to vertical back cord lateral surface and arrange horizontal back cord, laterally back cord spacing is 60cm.
5. concrete crane beam prefabricating and constructing according to claim 4, is characterized in that steel pipe frame comprises horizontal support steel pipe, the vertical vertical rod in steel pipe frame middle part, the vertical vertical rod of steel pipe frame surrounding, steel pipe frame horizontal cross bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210476209.6A CN102909786B (en) | 2012-11-22 | 2012-11-22 | Construction technology for prefabricating concrete crane beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210476209.6A CN102909786B (en) | 2012-11-22 | 2012-11-22 | Construction technology for prefabricating concrete crane beam |
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| Publication Number | Publication Date |
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| CN102909786A CN102909786A (en) | 2013-02-06 |
| CN102909786B true CN102909786B (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210476209.6A Active CN102909786B (en) | 2012-11-22 | 2012-11-22 | Construction technology for prefabricating concrete crane beam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115434372B (en) * | 2022-08-09 | 2024-06-04 | 深圳市建工集团股份有限公司 | Be used for basement outer wall post-cast strip assembled template to exempt from to chisel hair to block and establish device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2554888A1 (en) * | 1975-12-05 | 1977-06-08 | Esli James Forrest | Multi stage reinforced concrete beam casting - includes base layer partially set before adding tensioning members followed by upper layers |
| US4629408A (en) * | 1985-09-06 | 1986-12-16 | Arctic Equipment Rental, Inc. | Portable concrete beam harping system |
| JP2002250093A (en) * | 2001-02-23 | 2002-09-06 | Sanwa Kensetsu:Kk | Construction method of t-type beam slab |
| CN101125441A (en) * | 2007-08-31 | 2008-02-20 | 中铁二局股份有限公司 | Post-tensioned method prestressed concrete box beam whole opening prefabricated construction method |
| CN101748681A (en) * | 2009-12-22 | 2010-06-23 | 浙江省大成建设集团有限公司 | Pretensioning method construction technology of 50m broken line reinforced concrete T-shaped beam |
| CN101905485A (en) * | 2010-07-15 | 2010-12-08 | 孙允禄 | Application method of stress template molding die in continuous production of cement components |
-
2012
- 2012-11-22 CN CN201210476209.6A patent/CN102909786B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2554888A1 (en) * | 1975-12-05 | 1977-06-08 | Esli James Forrest | Multi stage reinforced concrete beam casting - includes base layer partially set before adding tensioning members followed by upper layers |
| US4629408A (en) * | 1985-09-06 | 1986-12-16 | Arctic Equipment Rental, Inc. | Portable concrete beam harping system |
| JP2002250093A (en) * | 2001-02-23 | 2002-09-06 | Sanwa Kensetsu:Kk | Construction method of t-type beam slab |
| CN101125441A (en) * | 2007-08-31 | 2008-02-20 | 中铁二局股份有限公司 | Post-tensioned method prestressed concrete box beam whole opening prefabricated construction method |
| CN101748681A (en) * | 2009-12-22 | 2010-06-23 | 浙江省大成建设集团有限公司 | Pretensioning method construction technology of 50m broken line reinforced concrete T-shaped beam |
| CN101905485A (en) * | 2010-07-15 | 2010-12-08 | 孙允禄 | Application method of stress template molding die in continuous production of cement components |
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| CN102909786A (en) | 2013-02-06 |
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