CN100526573C - Construction method of structure conversion layer concrete girder steel bracket formwork support - Google Patents

Construction method of structure conversion layer concrete girder steel bracket formwork support Download PDF

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Publication number
CN100526573C
CN100526573C CNB2008101204439A CN200810120443A CN100526573C CN 100526573 C CN100526573 C CN 100526573C CN B2008101204439 A CNB2008101204439 A CN B2008101204439A CN 200810120443 A CN200810120443 A CN 200810120443A CN 100526573 C CN100526573 C CN 100526573C
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conversion layer
steel
construction
joist
shaped steel
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CN101353912A (en
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胡正华
金瓯
郑笑芳
潘尚选
姜莉
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WENZHOU CONSTRUCTION GROUP CO Ltd
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WENZHOU CONSTRUCTION GROUP CO Ltd
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Abstract

The invention relates to a support construction method of a steel bracket template of a concrete crossbeam in a structure transition layer, which pertains to the technical filed of building construction methods. The method comprises the following steps: an embedded part of a joist supporting bracket is embedded; concrete of a column in the transition layer is poured; after the strength of the concrete of the column in the transition layer reaches more than C20, a column die in the transition layer is disassembled; a steel corbel, a shaped steel joist, a diagonal bracing shaped steel and a connecting shaped steel are arranged; a beam bottom formwork of the transition layer is laid; a preloading test is carried out to a steel joist of the beam of the transition layer; steel bars of the beam of the transition layer are bonded, and the erection of a template of a side beam form of the transition layer and a floor formwork is carried out; and concrete is poured onto the beam of the transition layer and a floor. A shaped steel-combined steel frame is adopted in the method, and the reinforced concrete column after pouring is used for supporting and bearing to form a combined bearing frame of the steel frame and the concrete column, thereby solving the construction difficulties of the formwork body with relatively high risk of the ultra high and overloaded crossbeam, ensuring the safe production of the construction process, solving the load bearing problem of the support frame by utilizing the frame column and guaranteeing construction quality. The method has the advantages of convenient construction and short construction period.

Description

Construction method of structure conversion layer concrete girder steel bracket formwork support
Technical field
The invention belongs to the technical field of construction techniques, be specifically related to a kind of construction method of structure conversion layer concrete girder steel bracket formwork support.
Background technology
Along with the continuous development of urban construction, increasing highrise building has adopted conversion layer to satisfy the demand of different building functions.Conversion layer structure has the advantages that conversion crossbeam sectional dimension is big, the conversion layer structure working load is heavy.The big beam forms of most of conversion layer belongs to the high and big die plate engineering, and country is defined as dangerous than large-engineering to the requirement of high and big die plate.When the cast-in-situ steel reinforced concrete beam of structural transition layer is constructed, adopt the steel tube fastener scaffold can't guarantee support body safety on the one hand as technology way routinely, its lower floor's floor design bearing capacity can't bear the load that support body transmits far away on the other hand.
Summary of the invention
At problems of the prior art, the object of the present invention is to provide a kind of technical scheme of construction method of structure conversion layer concrete girder steel bracket formwork support, adopt shaped steel combination steelframe, it is stressed to utilize the reinforced concrete post of having built to support, and guarantees the safety in production of construction overall process.
Described construction method of structure conversion layer concrete girder steel bracket formwork support is characterized in that comprising following processing step:
1) the conversion layer post build and bury underground built-in fitting: after conversion layer post reinforcing bar binding is finished, built-in fitting and following built-in fitting are being set respectively on the conversion layer post reinforcing bar, carry out the concreting of conversion layer post then, concrete casting is to nearly conversion layer beam bottom position, concrete curing is removed conversion layer post formwork after more than the intensity C20;
2) upward the built-in fitting outside is welded respectively steel corbel is set, the connection of two steel corbels top is provided with the shaped steel joist, be connected respectively between the shaped steel joist left and right sides and the following built-in fitting diagonal brace shaped steel is set, be connected between diagonal brace shaped steel medium position and the steel corbel connection shaped steel is set, wholely thus constitute conversion layer joist steel carriage;
3) lumps of wood and template are laid in shaped steel joist top;
4) conversion layer joist steel carriage is carried out the prefabricating load test;
5) reinforcing bar of colligation conversion layer beam and floor is set up conversion layer side template and slab form;
6) carry out building of conversion layer beam and floorslab concrete.
Described construction method of structure conversion layer concrete girder steel bracket formwork support is characterized in that built-in fitting is embedded in 380~400mm place under the conversion layer beam, and following built-in fitting is embedded in conversion layer post leftover bits and pieces 300~500mm and highly locates.
Described construction method of structure conversion layer concrete girder steel bracket formwork support is characterized in that describedly carrying out the concreting of conversion layer post and watering 3~7cm place to the conversion layer beam.
Described construction method of structure conversion layer concrete girder steel bracket formwork support is characterized in that described upward built-in fitting and steel corbel adopt double welding to weld.
Described construction method of structure conversion layer concrete girder steel bracket formwork support, it is characterized in that adopting welding or bolt to be connected between shaped steel joist that described steel corbel and top be equipped with, adopt welding or bolt to be connected between diagonal brace shaped steel and shaped steel joist, connect between shaped steel and diagonal brace shaped steel, steel corbel that employing is welded or bolt is connected.
Described construction method of structure conversion layer concrete girder steel bracket formwork support is characterized in that described laying conversion layer beam bottom board plate, if the span of conversion layer beam is greater than 4m, template is answered arch camber, and springing height is 2/1000 of a conversion layer beam span.
Described construction method of structure conversion layer concrete girder steel bracket formwork support is characterized in that the spacing of the lumps of wood that described shaped steel joist top is equipped with is 250mm.
Described construction method of structure conversion layer concrete girder steel bracket formwork support, it is characterized in that described conversion layer joist steel carriage being carried out prefabricating load test, prefabricating load loads by 110% of design load value, adopting at a slow speed gradually, loading method loads, load divides 4-6 level, and the time interval that loads every grade of load is half an hour, and the steel joist under every grade of load supports sedimentation and reaches and add the next stage load again after relatively stable, load end condition up to satisfying, be offloaded to zero then gradually.
Described construction method of structure conversion layer concrete girder steel bracket formwork support is characterized in that the steel joist supports settling amount and adopts dial gage to measure, and dial gage is arranged under the shaped steel joist, lays respectively at conversion layer beam middle part and conversion layer Liang1/6Chu.
Described construction method of structure conversion layer concrete girder steel bracket formwork support is characterized in that described loading end condition for supporting trial load when reaching the channel-section steel joist, and its distortion is stable, and its maximum deformation value is not more than L/400, can stop loading.
The present invention adopts shaped steel combination steelframe, reinforced concrete post after utilization is built supports stressed, form a steelframe, concrete column combination heavy frame, solved the construction difficult problem of the big formwork support body of danger of superelevation, overweight crossbeam, guaranteed the safety in production of construction overall process, utilize frame column to solve the stressed of bracing frame, power transmission is clear and definite, and is stressed reasonable, guaranteed the quality of engineering, easy construction, the duration is short.After finishing concrete pouring construction, shaped steel can be removed the back recycling, reduce the cost cost conversion layer beam and floor.
Description of drawings
Fig. 1 is a structural representation of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described in further details.
At first carrying out joist Support bracket built-in fitting buries underground, after conversion layer post 1 reinforcing bar binding is finished, bury joist Support bracket built-in fitting in the conversion layer post 1 under conversion layer beam 2 underground, comprise built-in fitting 6 and following built-in fitting 9, last built-in fitting 6 in the present embodiment is welded by 2 Φ 18U type I grade reinforcing steels and-200 * 200 * 16 steel plates, is embedded in 2 times 380~400mm places of conversion layer beam; Following built-in fitting 9 is welded by 2 Φ 18U type I grade reinforcing steels and-350 * 200 * 16 steel plates, is embedded in conversion layer post 1 leftover bits and pieces 300~500mm and highly locates, and double welding is adopted in the welding on last built-in fitting 6, the following built-in fitting 9, weld bead height 10mm, and welding rod adopts the E43 type.After having buried underground, build conversion layer post 1 concrete, conversion layer post 1 concrete casting is preferably 5cm to 2 times 3~7cm places of conversion layer beam.Because the bearing of channel-section steel bearing frame is embedded in the post, stressed by pillar, need 5~7 days approximately apart from the next procedure pouring concrete, this moment, the post concrete strength reached more than the C20, and its anchoring bearing capacity has reached the force request of channel-section steel joist bearing frame.After conversion layer post concrete strength reaches more than the C20, remove conversion layer post mould, should be during form removal according to form removal test block report, concrete strength can guarantee its surface and corner angle not because of stripping impaired after, can remove.
When conversion layer post 1 build finish concrete strength and reach the requirement form removal after, welding is provided with steel corbel 11 in last built-in fitting 6 outsides, steel corbel 11 side plates adopt two-170 * 135 * 16 steel plates and one-200 * 80 * 16 steel plate, cover plate adopts-200 * 200 * 16 steel plates, four block plates and last built-in fitting 6 adopt double welding to weld, weld bead height 10mm, welding rod adopts the E43 type.Steel corbel 11 tops are equipped with shaped steel joist 7 along conversion layer beam axis direction, adopt between shaped steel joist 7 and the steel corbel 11 to weld or bolt is connected.Shaped steel joist 7 left and right sides spans 1/3 place is provided with diagonal brace shaped steel 10 respectively and is connected with following built-in fitting 9, and employing is welded or bolt is connected between diagonal brace shaped steel 10 and the shaped steel joist 7, and shaped steel joist 7, diagonal brace shaped steel 10 all use 2 [16a channel-section steels.Be equipped with between diagonal brace shaped steel 10 and the steel corbel 11 and be connected shaped steel 8, connect between shaped steel 8 and diagonal brace shaped steel 10, the steel corbel 11 and adopt welding or bolt to be connected, connection shaped steel 8 employing ∠ 100 * 8 models.Constitute conversion layer joist steel carriage by above-mentioned integral body.
Lay conversion layer beam bottom board plate after steelframe is set up and finished, shaped steel joist 7 tops are equipped with a prescription wood 5, are equipped with template 4 on the lumps of wood 5, and the lumps of wood 5 adopts the lumps of wood of 50mm * 100mm, and the spacing of the lumps of wood 5 is 250mm, and template 4 adopts the thick nine layers of wooden splint of 18mm.If the span of conversion layer beam 2 greater than 4m, then needs template 4 is carried out arch camber, springing height is 2/1000 of conversion layer beam 2 spans.
Layer joist steel carriage soffit formwork to be converted adopts the precompressed measure that the load performance of steel carriage is tested after setting up and finishing, and prefabricating load loads by 110% of design load value.Adopting at a slow speed gradually, loading method loads, load divides 4-6 level, and the time interval that loads every grade of load is half an hour, and the steel joist under every grade of load supports sedimentation and reaches and add the next stage load again after relatively stable, load end condition up to satisfying, be offloaded to zero then gradually.The steel joist supports settling amount and adopts dial gage to measure, and dial gage is arranged under the shaped steel joist, lays respectively at conversion layer beam middle part and conversion layer Liang1/6Chu.Steel joist supporting settling amount blanking time is read in survey, surveys after every grade of loading and reads once, and 10min surveys and reads once at interval later on, treats that add next stage after stable half an hour.The termination loading environment is, when reaching channel-section steel joist supporting trial load, its distortion is stable, and its maximum deformation value is not more than L/400, can stop loading.The opposite program of unloading for loading, read residual settlement one time every the 15min survey after every grade of unloading, after reading 2 times, read again once every 30min, can unload the next stage load, all after the off-load, read again once every 3-4h, and carry out detail record, work out big beam support deflection deformation amount, summary sheet under the prefabricating loads at different levels.
After tested steel joist supporting capacity reached requirement, colligation conversion layer beam 2 reinforcing bars and floor 3 reinforcing bars because conversion layer beam muscle is many and staggered complicated, therefore need be set up the reinforcing bar binding falsework.Set up conversion layer side template and slab form then, the side form crosspiece adopts 50mm * 100mm lumps of wood, spacing 300mm; Vertically establish the beam side fixation kit, spacing 400 adopts Φ 14~16 Screw arbor with nut at both-ends to fix, Screw arbor with nut at both-ends horizontal spacing 400mm, and vertical spacing 400mm, or definite according to designing and calculating.
Can carry out concreting to conversion layer beam 2 and floor 3 at last.In the process of concreting, strict concrete preloading thickness of control and order, surperficial concrete preloading height<200mm.Use pure channel-section steel joist that limitation is arranged when higher or load is big when depth of beam, can consider to adopt the superposed beam construction, the actual loading of channel-section steel joist is reduced, increase the construction safety coefficient.After the concrete strength of conversion layer beam reached requirement, the recycling of promptly dismountable steel carriage had reduced the cost cost.

Claims (9)

1. construction method of structure conversion layer concrete girder steel bracket formwork support is characterized in that comprising following processing step:
1) conversion layer post (1) build and bury underground built-in fitting: after conversion layer post (1) reinforcing bar binding is finished, built-in fitting (6) and following built-in fitting (9) are set respectively on conversion layer post (1) reinforcing bar, carry out conversion layer post (1) concreting then, concrete casting is to nearly conversion layer beam (2) bottom position, concrete curing is removed conversion layer post (1) formwork after more than the intensity C20;
2) upward built-in fitting (6) outside is welded respectively steel corbel (11) is set, the connection of two steel corbels (11) top is provided with shaped steel joist (7), be connected respectively between shaped steel joist (7) left and right sides and the following built-in fitting (9) diagonal brace shaped steel (10) is set, be connected between diagonal brace shaped steel (10) medium position and the steel corbel (11) to be provided with and connect shaped steel (8), wholely thus constitute conversion layer joist steel carriage;
3) lumps of wood (5) and template (4) are laid in shaped steel joist (7) top;
4) conversion layer joist steel carriage is carried out the prefabricating load test;
5) reinforcing bar of colligation conversion layer beam (2) and floor (3) is set up conversion layer side template and slab form;
6) carry out conversion layer beam (2) and concrete the building of floor (3).
2. construction method of structure conversion layer concrete girder steel bracket formwork support as claimed in claim 1, it is characterized in that built-in fitting (6) is embedded in 380~400mm place under the conversion layer beam (2), following built-in fitting is embedded in conversion layer post (1) leftover bits and pieces 300~500mm and highly locates.
3. construction method of structure conversion layer concrete girder steel bracket formwork support as claimed in claim 1 is characterized in that describedly carrying out conversion layer post (1) concreting and watering to the following 3~7cm place of conversion layer beam (2).
4. construction method of structure conversion layer concrete girder steel bracket formwork support as claimed in claim 1 is characterized in that the described built-in fitting (6) of going up adopts double welding to weld with steel corbel (11).
5. construction method of structure conversion layer concrete girder steel bracket formwork support as claimed in claim 1, it is characterized in that adopting welding or bolt to be connected between shaped steel joist (7) that described steel corbel (11) and top be equipped with, adopt welding or bolt to be connected between diagonal brace shaped steel (10) and shaped steel joist (7), connect between shaped steel (8) and diagonal brace shaped steel (10), steel corbel (11) that employing is welded or bolt is connected.
6. construction method of structure conversion layer concrete girder steel bracket formwork support as claimed in claim 1 is characterized in that the spacing of the lumps of wood (5) that described shaped steel joist (7) top is equipped with is 250mm.
7. construction method of structure conversion layer concrete girder steel bracket formwork support as claimed in claim 1, it is characterized in that described conversion layer joist steel carriage being carried out prefabricating load test, prefabricating load loads by 110% of design load value, adopting at a slow speed gradually, loading method loads, load divides 4-6 level, the time interval that loads every grade of load is half an hour, steel joist under every grade of load supports sedimentation and reaches and add the next stage load again after relatively stable, load end condition up to satisfying, be offloaded to zero then gradually.
8. construction method of structure conversion layer concrete girder steel bracket formwork support as claimed in claim 7, it is characterized in that the steel joist supports settling amount and adopts dial gage to measure, dial gage is arranged under the shaped steel joist, lays respectively at conversion layer beam middle part and conversion layer Liang1/6Chu.
9. construction method of structure conversion layer concrete girder steel bracket formwork support as claimed in claim 7, it is characterized in that described loading end condition is for supporting trial load when reaching the channel-section steel joist, its distortion is stable, and its maximum deformation value is not more than L/400, can stop loading.
CNB2008101204439A 2008-08-28 2008-08-28 Construction method of structure conversion layer concrete girder steel bracket formwork support Active CN100526573C (en)

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CN101818570B (en) * 2010-03-23 2011-06-15 南通宏华建筑安装有限公司 Method for constructing girder structure conversion layer of high-rise building
CN101914990B (en) * 2010-07-28 2012-07-25 重庆建工第二建设有限公司 Beam-type transition layer cast-in-situ crossbeam construction formwork supporting system
CN103628675A (en) * 2013-10-30 2014-03-12 中建三局建设工程股份有限公司 Bailey beam type formwork supporting system and construction method thereof for super high-rise transfer story crossbeam
CN103628408B (en) * 2013-11-01 2016-03-02 中铁十七局集团第二工程有限公司 The construction method of bridge cast in place concrete form Eight characters bracing frame
CN105648911B (en) * 2014-11-25 2017-11-24 中铁二十一局集团有限公司 Bridge construction Cast-in-situ Beam, bent cap, binder concrete adhesion type prestressed girder support
CN105178490A (en) * 2015-08-07 2015-12-23 北京城建北方建设有限责任公司 Double-layer step-by-step laminated construction method of ultrahigh and ultrathick prestressed concrete floor
CN106013434B (en) * 2016-07-18 2019-01-08 江苏工程职业技术学院 Bean column node fixed structure and installation method among a kind of prefabricated construction
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CN106284094A (en) * 2016-09-18 2017-01-04 中铁二十局集团有限公司 A kind of bridge construction concrete adhesion type prestressed girder support
CN106522551A (en) * 2016-11-18 2017-03-22 重庆建工住宅建设有限公司 Steel fiber self-compacting concrete construction method for conversion layer
CN108729673A (en) * 2018-04-12 2018-11-02 五冶集团上海有限公司 A kind of tool-typed formwork hoisting die construction method at plate face difference of height
CN108643341B (en) * 2018-05-22 2020-02-07 中冶建工集团有限公司 Construction method of box type structure conversion layer of super high-rise building
CN111910765A (en) * 2020-08-10 2020-11-10 中交一公局集团有限公司 Construction method of high-altitude steel reinforced concrete pouring support system

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CN1078524A (en) * 1992-05-04 1993-11-17 范家声 Brick-and-concrete buildings constructional column, collar tie beam cast-in-situ construction method and device

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