CN102251667B - Construction method for reinforced concrete arched roof of grain store - Google Patents

Construction method for reinforced concrete arched roof of grain store Download PDF

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Publication number
CN102251667B
CN102251667B CN 201110121233 CN201110121233A CN102251667B CN 102251667 B CN102251667 B CN 102251667B CN 201110121233 CN201110121233 CN 201110121233 CN 201110121233 A CN201110121233 A CN 201110121233A CN 102251667 B CN102251667 B CN 102251667B
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CN
China
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arch
edge
construction
pedestal
plate
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CN 201110121233
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Chinese (zh)
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CN102251667A (en
Inventor
杨广辉
陈崇彬
胥超
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中冶建工集团有限公司
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Publication of CN102251667B publication Critical patent/CN102251667B/en

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Abstract

The invention discloses a construction method for a reinforced concrete arched roof of a grain store. The method comprises the following steps of: erecting a scaffold at the middle longitudinal part of a ring beam, and making a pedestal; paving lower chord prestressed steel bars, and performing prestressed tensioning; erecting a lower chord bottom die and a side die, installing a partition plate, and installing an upper chord arched bottom die and an upper chord arched side die at the top of the partition plate; paving upper chord steel bars; pouring concrete; stretching the prestressed steel bars when the strength of the concrete reaches over 85 percent, welding diagonal braces, and obtaining an arched plate after the diagonal braces are welded; and translating the arched plate, and welding and fixing the arched plate with an embedded steel plate. Because the construction mode of overhead prefabrication and integral translation is adopted, a large machine for hoisting is avoided, the construction progress is quickened, the safety risk is reduced, the cost is saved, the temporary site is reduced, and the construction efficiency is improved.

Description

Construction method for reinforced concrete arched roof of grain store

Technical field

The present invention relates to a kind of reinforced concrete construction method, relate in particular to a kind of construction method for reinforced concrete arched roof of grain store.

Background technology

The silo of existing deposit grain and oil mainly adopts concentrated many buildings of building to fall apart and closes a position, and each loose closing a position is brick mix structure, and roof system is steel concrete arch roof system, winds up to be the second-degree parabola equation.The prestressed reinforced concrete arch bar is collection load-bearing, waterproof, the multi-functional roof system such as heat insulation, and it is comprised of upper and lower string shell-slab, girt strip, dividing plate and brace.Upper lower edge connects into integral body with dividing plate, and under every arch bar 4 built-in fittings is arranged, and welds together with collar tie beam.Arch bar, partition plate coagulation soil strength grade are C35, and the lower edge prestressed reinforcement adopts the CRB800 level, winds up and adopts the CRB550 level with the dividing plate reinforcing bar.

Existing construction method for reinforced concrete arched roof of grain store mainly contains two kinds: one, the prefabricated rear construction method for hanging in ground; Two, monolithic casting construction method.

Mainly there is following deficiency in the prefabricated rear construction method for hanging in ground: the prefabricated needs in (1), ground wait for that concrete strength just can lift when reaching 100%, and lifting needs the time interval with prefabricated, and the construction period is long; (2), when lifting need adopt the big machinery lifting, because of upper lower edge thinner thickness, lifts fragile upper lower edge, produces quality problems, be unfavorable for quality control, and the fund input in early stage is large, expense for using mechanical equipment is higher.

Mainly there is following deficiency in monolithic casting construction method: the construction of (1), arch bar has that engineering quantity is large, difficulty is large, it is high to require; (2) below whole pouring concrete zone, all need set up scaffold, take springboard, spread template.Therefore, whole construction not only takes up room greatly, and material and artificial input amount are large, and construction cost is high; And being prone to work holdup phenomenon, construction efficiency is low.

Summary of the invention

For weak point of the prior art, the invention provides a kind of big machinery lifting of both having avoided adopting, be conducive to again accelerating construction progress, reduce security risk, save cost, reduce the construction method for reinforced concrete arched roof of grain store of temporary site.

Construction method for reinforced concrete arched roof of grain store provided by the invention, the method comprises the following steps:

1) pre-embedded steel slab on the collar tie beam of arch cover to be installed; Make simultaneously dividing plate;

2) set up scaffold at the longitudinal middle part of collar tie beam, make the pedestal of aerial precast prestressed arch bar, and at the two ends of pedestal the preformed hole that jack is installed is set;

3) lay the lower edge prestressed reinforcement, and the lower edge prestressed reinforcement is carried out prestressed stretch-draw;

4) after the stretch-draw of lower edge prestressed reinforcement, carry out immediately the colligation of lower edge distribution reinforcement;

5) install lower edge bed die and Bian Mo, dividing plate is installed, with bottom and the colligation of lower edge prestressed reinforcement of dividing plate; Then at the top of dividing plate the arch-shaped bottom mould that winds up is installed, and is adjusted height with timber wedge; At last with the rebar clips arch side form that fixedly winds up;

6) lay wind up reinforcing bar and the reinforcing bar binding that winds up;

7) concreting: concrete adopts Site, carries out pouring concrete with the tower crane feed, and concrete adopts first span centre, rear two ends, first lower edge, after wind up build sequentially;

8) treat that concrete strength reaches 85% when above, can put prestressed reinforcement that an in time welding brace after putting after the brace welding is finished, namely makes arch bar;

9) arch bar that makes is carried out translation: in the preformed hole of pedestal, place jack, utilize jack with arch bar jack-up, again scooter is placed on collar tie beam corresponding to arch bar below; Then arch bar is descended and drop on the scooter, utilize scooter along the collar tie beam straight-line rolling arch bar to be moved to the end of collar tie beam, and be welded and fixed with pre-embedded steel slab;

10) repeat above-mentioned steps 3) to step 9), the arch bar that makes is installed to the centre gradually by vertical two ends of collar tie beam, clog flax silk in the slit between adjacent two arch bars, in the 2cm suitable for reading of slit, use pitch ointment filleting.

Further, make n pedestal at the longitudinal middle part of collar tie beam, n is the odd number more than or equal to 3; For the first time 1,3 ..., aerial Prefabricated arch plate on the n odd number pedestal, for the second time 2,4 ..., aerial Prefabricated arch plate on the n-1 even number pedestal; To aerial prefabricated during for plate on the second time even number pedestal, the lower edge limit mould on the even number and the arch side form that winds up utilize the lower edge limit mould on the odd number of the adjacent both sides of this even number and the arch side form that winds up.

Further, when the lower edge prestressed reinforcement was carried out stretch-draw, prestressed reinforcement of tensioning adopted from the centre to both sides, and order is from top to bottom carried out.

Further again, when reinforcing bar binding, the used steel wire afterbody of colligation will be pressed to the inboard of beam or plate.

Compared with prior art, construction method for reinforced concrete arched roof of grain store of the present invention adopts the form of construction work of prefabricated, integral translation in the air, has following advantage:

1, compares with the prefabricated rear construction method for hanging in ground: the aerial prefabricated very large prefabricated place that do not need, do not need to make in advance a large amount of precast pedestals and Tai Dun, reduce the fund input in early stage, on other operations without direct impact, can arrange preferably sequence of construction, and save disposable input, can reduce temporary site, to the place without specific (special) requirements.

2, compare with the prefabricated rear construction method for hanging in ground: aerial prefabricated as long as concrete strength reaches 85%, just can carry out prestressing force and put and open, translation can significantly be saved the duration.

3, compare with the prefabricated rear construction method for hanging in ground: the aerial prefabricated big machinery lifting that reduced, the quality problems of having avoided lifting to produce are conducive to quality control, have reduced expense for using mechanical equipment usefulness.

4, compare with monolithic casting construction method: the present invention arranges precast pedestal at the longitudinal middle part of collar tie beam, take full advantage of space plane, each operation is overlapping in time, effectively expanded operation side, more rationally arrange compactly working procedure, on-the-spot material supply is timely, avoids work holdup phenomenon, has improved construction efficiency.

Description of drawings

Fig. 1 is the front view of arch bar steel work;

Fig. 2 is the top view of arch bar steel work.

The specific embodiment

Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.

Construction method for reinforced concrete arched roof of grain store, the method comprises the following steps:

1) pre-embedded steel slab on the collar tie beam of arch cover to be installed; Make simultaneously dividing plate.

2) set up scaffold at the longitudinal middle part of collar tie beam, make the pedestal of aerial precast prestressed arch bar, and at the two ends of pedestal the preformed hole that jack is installed is set.The general preformed hole that two installation jack are set respectively at the two ends of pedestal.

3) lay the lower edge prestressed reinforcement, and the lower edge prestressed reinforcement is carried out prestressed stretch-draw.When the lower edge prestressed reinforcement was carried out stretch-draw, prestressed reinforcement of tensioning adopted from the centre to both sides, and order is from top to bottom carried out.

4) after the stretch-draw of lower edge prestressed reinforcement, carry out immediately the colligation of lower edge distribution reinforcement.During operation, pull reinforcement location with chalk first, and then carry out cloth muscle, colligation, guarantee that colligation is neat, require smooth vertical and horizontally, position and spacing are correct.During reinforcing bar binding, the used steel wire afterbody of colligation will all be pressed to the inside of beam or plate, prevents from tying up silk and exposes.

5) install lower edge bed die and Bian Mo, dividing plate is installed, with bottom and the colligation of lower edge prestressed reinforcement of dividing plate; Then at the top of dividing plate the arch-shaped bottom mould that winds up is installed, and is adjusted height with timber wedge; At last with the rebar clips arch side form that fixedly winds up.

6) lay wind up reinforcing bar and the reinforcing bar binding that winds up.

7) concreting: concrete adopts Site, carries out pouring concrete with the tower crane feed, and concrete adopts first span centre, rear two ends, first lower edge, after wind up build sequentially.Build finish after, the maintenance of sprinkling water, and add a cover plastic sheeting, curing time is no less than 7 days.

8) treat that concrete strength reaches 85% when above, can put prestressed reinforcement, an in time welding brace after putting, after the brace welding was finished, (as shown in Figure 1, 2, among the figure: 1 was the lower edge prestressed reinforcement namely to make arch bar, 2 is dividing plate, and 3 are the reinforcing bar that winds up, and 4 are brace).In putting a process, should put first a girt strip reinforcing bar, put again a plate face reinforcing bar, presstressed reinforcing steel should be opened from both sides by staggered the putting of root, puts Zhang Gong and does and should slowly carry out.

9) arch bar that makes is carried out translation: in the preformed hole of pedestal, place jack, utilize jack with arch bar jack-up, again scooter is placed on collar tie beam corresponding to arch bar below; Then arch bar is descended and drop on the scooter, utilize scooter along the collar tie beam straight-line rolling arch bar to be moved to the end of collar tie beam, and be welded and fixed with pre-embedded steel slab.When utilizing scooter translation arch bar, need the collar tie beam under scooter to lay steel plate, in the arch bar moving process, scooter is rolled, with the power of reducing friction at steel plate.The hauling block car can adopt bottle gouard moved by hands to draw.

10) repeat above-mentioned steps 3) to step 9), the arch bar that makes is installed to the centre gradually by vertical two ends of collar tie beam, clog flax silk in the slit between adjacent two arch bars, stay 2cm suitable for reading not fill out, use at last pitch ointment filleting.

Longitudinal middle part at collar tie beam is made n pedestal (can determine according to actual place, duration the quantity of pedestal), and n is the odd number more than or equal to 3; For the first time 1,3 ..., aerial Prefabricated arch plate on the n odd number pedestal, for the second time 2,4 ..., aerial Prefabricated arch plate on the n-1 even number pedestal.To aerial prefabricated during for plate on the second time even number pedestal, lower edge limit mould on the even number and the arch side form that winds up utilize the lower edge limit mould on the odd number of the adjacent both sides of this even number and the arch side form that winds up, the lower edge limit mould that need not again on the dual numbers installs separately template with the arch side form that winds up, both saved the template consumption, reduce again labour intensity, improved efficiency of construction.

Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (3)

1. a construction method for reinforced concrete arched roof of grain store is characterized in that the method comprises the following steps:
1) pre-embedded steel slab on the collar tie beam of arch cover to be installed; Make simultaneously dividing plate;
2) set up scaffold at the longitudinal middle part of collar tie beam, make the pedestal of aerial precast prestressed arch bar, and at the two ends of pedestal the preformed hole that jack is installed is set;
3) lay the lower edge prestressed reinforcement, and the lower edge prestressed reinforcement is carried out prestressed stretch-draw;
4) after the stretch-draw of lower edge prestressed reinforcement, carry out immediately the colligation of lower edge distribution reinforcement;
5) install lower edge bed die and Bian Mo, dividing plate is installed, with bottom and the colligation of lower edge prestressed reinforcement of dividing plate; Then at the top of dividing plate the arch-shaped bottom mould that winds up is installed, and is adjusted height with timber wedge; At last with the rebar clips arch side form that fixedly winds up;
6) lay wind up reinforcing bar and the reinforcing bar binding that winds up;
7) concreting: concrete adopts Site, carries out pouring concrete with the tower crane feed, and concrete adopts first span centre, rear two ends, first lower edge, after wind up build sequentially;
8) treat that concrete strength reaches 85% when above, can put prestressed reinforcement that an in time welding brace after putting after the brace welding is finished, namely makes arch bar;
9) arch bar that makes is carried out translation: in the preformed hole of pedestal, place jack, utilize jack with arch bar jack-up, again scooter is placed on collar tie beam corresponding to arch bar below; Then arch bar is descended and drop on the scooter, utilize scooter along the collar tie beam straight-line rolling arch bar to be moved to the end of collar tie beam, and be welded and fixed with pre-embedded steel slab;
10) repeat above-mentioned steps 3) to step 9), the arch bar that makes is installed to the centre gradually by vertical two ends of collar tie beam, clog flax silk in the slit between adjacent two arch bars, in the 2cm suitable for reading of slit, use pitch ointment filleting;
Wherein, step 2) in, making n pedestal at the longitudinal middle part of collar tie beam, n is the odd number more than or equal to 3; For the first time 1,3 ..., aerial Prefabricated arch plate on the n odd number pedestal, for the second time 2,4 ..., aerial Prefabricated arch plate on the n-1 even number pedestal; To aerial prefabricated during for plate on the second time even number pedestal, the lower edge limit mould on the even number and the arch side form that winds up utilize the lower edge limit mould on the odd number of the adjacent both sides of this even number and the arch side form that winds up.
2. construction method for reinforced concrete arched roof of grain store according to claim 1, it is characterized in that: when the lower edge prestressed reinforcement was carried out stretch-draw, prestressed reinforcement of tensioning adopted from the centre to both sides, and order is from top to bottom carried out.
3. construction method for reinforced concrete arched roof of grain store according to claim 2, it is characterized in that: when reinforcing bar binding, the used steel wire afterbody of colligation will be pressed to the inboard of beam or plate.
CN 201110121233 2011-05-11 2011-05-11 Construction method for reinforced concrete arched roof of grain store CN102251667B (en)

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Application Number Priority Date Filing Date Title
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CN102251667B true CN102251667B (en) 2013-04-17

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103225403B (en) * 2013-05-10 2015-07-15 史东生 Method for installing elastic supporting and lifting devices by adopting prestressing technique
CN104895260A (en) * 2015-04-01 2015-09-09 陈伟冬 Prestressed arched plate high-altitude casting and translation process
CN105220808B (en) * 2015-09-11 2018-01-16 杭州江润科技有限公司 Large-span prestressed arch bar in-situ precast construction method of installation
CN108301547A (en) * 2018-02-24 2018-07-20 佛山市知而行信息科技有限公司 Preparation method without beam arched roof panel
CN109162461A (en) * 2018-10-31 2019-01-08 李文华 A kind of lower boom plate placing installation of arch bar concrete pouring construction
CN109351892B (en) * 2018-10-31 2020-04-14 马鞍山华亿工程技术有限公司 Prestressed reinforcement releasing and stretching equipment for arch bar concrete pouring construction
CN109707093A (en) * 2018-12-29 2019-05-03 中铁建设集团南方工程有限公司 Arch bar hovel face arch bar construction

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1046659C (en) * 1996-09-09 1999-11-24 四川省粮食勘察设计所 Aerial prefabricating and constructing tech. for prestressed concrete arch-bar roof truss

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