CN110905113A - Construction method of large-span concrete dome structure - Google Patents
Construction method of large-span concrete dome structure Download PDFInfo
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- CN110905113A CN110905113A CN201911010601.XA CN201911010601A CN110905113A CN 110905113 A CN110905113 A CN 110905113A CN 201911010601 A CN201911010601 A CN 201911010601A CN 110905113 A CN110905113 A CN 110905113A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B7/00—Roofs; Roof construction with regard to insulation
- E04B7/08—Vaulted roofs
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
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Abstract
The invention relates to a construction method of a large-span concrete dome structure, which comprises the following steps: firstly, dividing the construction of a concrete dome structure into a first construction section, a second construction section, a third construction section, a fourth construction section, a fifth construction section and a sixth construction section; secondly, deformation observation: making four observation points on the outer mold of the dome in four directions, and arranging a special person to observe the plane displacement of the dome template and the frame body settlement during concrete pouring; thirdly, setting a construction joint: placing a wooden tenon at the construction joint to form an internal and external height difference at the construction joint; fourthly, maintenance: in order to reduce the water dispersion and plastic cracking of the concrete, after the concrete is initially set, wet linen is adopted for covering, and watering is carried out in time, so that the concrete can dissipate heat in time. The invention realizes the quick and efficient construction of the large-span dome.
Description
Technical Field
The invention belongs to the field of building construction, and particularly relates to a construction method of a large-span concrete dome structure.
Background
With the development of science and technology, the originality of the main structure body in the building field is gradually novel, individual and beautiful, and the space structure also breaks through the original limitation, thus achieving rapid development. In a large-span space structure, in order to express magnificent and extensive cultural source, a reinforced concrete thin-shell structure becomes the first of designers, and compared with a general reinforced concrete roof structure, a large-span dome has a greatly different construction method.
Disclosure of Invention
The invention aims to provide a construction method of a large-span concrete dome structure so as to realize the quick and efficient construction of a large-span dome.
In order to achieve the purpose, the invention specifically provides the following technical scheme: a construction method of a large-span concrete dome structure comprises the following steps: firstly, dividing the construction of a concrete dome structure into a first construction section, a second construction section, a third construction section, a fourth construction section, a fifth construction section and a sixth construction section; secondly, deformation observation: making four observation points on the outer mold of the dome in four directions, and arranging a special person to observe the plane displacement of the dome template and the frame body settlement during concrete pouring; thirdly, setting a construction joint: placing a wooden tenon at the construction joint to form an internal and external height difference at the construction joint; fourthly, maintenance: in order to reduce the water dispersion and plastic cracking of the concrete, after the concrete is initially set, wet linen is adopted for covering, and watering is carried out in time, so that the concrete can dissipate heat in time.
Further, the first step: the method is characterized in that the dome frame is uniformly stressed, two automobile pumps are symmetrically used for discharging concrete, the concrete is poured by a clockwise layered slope propelling method along the circumferential direction, the concrete pouring speeds of two pouring points are kept consistent, the concrete is poured in a sixth construction section, only a bottom formwork is used, the concrete slump is required to be 140-160 mm so as to prevent flowing, the concrete is poured from bottom to top in layers, a vibrating rod is vibrated at a proper point to ensure that the concrete is compact but can not flow in a large amount, when the concrete is about to be initially set, a cover formwork is used for covering an accurate radian, then light is collected for three times, and finally a plastic film is covered.
Further, the first step: the concrete is guaranteed to be fully dense, vibration is carried out on the outer side of the template in an auxiliary mode during pouring, concrete bubbles are completely discharged according to the vibration principle, the concrete surface does not sink, and vibration points are uniformly distributed.
Further, the maintenance age is not preferably less than 14 days. In addition, the mold stripping time is prolonged and should be more than 3 days.
Further, the construction joint treatment method comprises the construction joint treatment measures, when concrete is continuously poured at the construction joint, the compressive strength of the poured concrete must reach more than 1.2Mpa, when the construction joint is constructed, a cement film and loose stones are removed from the surface of the hardened concrete, construction joint battens are removed, simultaneously, roughening is carried out, water is used for washing and fully wetting, and accumulated water remained on the surface of the concrete is removed.
The invention has the beneficial effects that: the template system is designed by selecting conventional multilayer boards, square timbers, fasteners and steel pipes, materials can be recycled, and engineering cost is reduced.
And secondly, reasonably setting a hemisphere construction section, constructing in sections, assembling templates in sections, pouring concrete in sections, and ensuring the concrete forming quality.
And thirdly, the wall thickness of the dome is accurately controlled by adjusting the distance between the split bolt positioning pieces.
Fourthly, the tenon processing at the construction joint ensures the concrete pouring quality at the dome construction joint.
And fifthly, the steel ridges are arranged in the circumferential direction, so that the difficulty of positioning the circular arc is reduced, and the accurate positioning of the circumferential steel ridges is the guarantee of the construction precision of the hyperboloid.
Drawings
Fig. 1 is a schematic view of a concrete dome structure according to an exemplary embodiment of the present invention.
Detailed Description
As shown in fig. 1, a construction method of a large-span concrete dome structure includes the following steps:
1) pouring mode: the concrete pouring method comprises the steps of first, second, third, fourth, fifth and sixth construction sections (the four construction sections are constructed according to the wall plate), in order to ensure that the stress of the dome frame body is uniform, two automobile pumps are symmetrically (connecting lines pass through the circle center) used for blanking, and the concrete pouring is carried out according to a clockwise layered slope propelling method along the annular direction. The concrete pouring speeds of the two pouring points are kept consistent.
And (3) concrete pouring is carried out at a sixth construction section, only a bottom formwork is used, and the concrete slump is required to be 140-160 mm so as to prevent flowing. The concrete is poured from bottom to top in layers, the vibrating rod vibrates properly to ensure the compactness but not to make the concrete flow in large quantity, when the concrete is about to be initially set, the accurate radian is formed by a die set, and then the light is collected for three times. And finally covering a plastic film.
Vibrating: because the member has small section size, dense reinforcing steel bars and large concrete cohesiveness, in order to ensure that the concrete is fully dense, the vibration of the outer side of the template is assisted during pouring so as to avoid the defect caused by uneven concrete flow and facilitate the removal of air bubbles in the concrete. The principle of vibration is based on that concrete bubbles are completely discharged and the surface of concrete does not sink. The vibrating points are uniformly distributed, and the vibrating is strictly forbidden to be carried out for a long time at one point so as to avoid separating the concrete.
2) And (3) deformation observation: four observation points are made on the outer mold of the dome in four directions, a specially-assigned person is arranged to observe the plane displacement of the dome template and the frame body settlement when concrete pouring is carried out, if the position of the positioning line is found to move, pouring is stopped immediately, and a field responsible person is informed to take countermeasures. In the concrete pouring process, a specially-assigned person is required to attend to the template, the pouring is timely informed to stop when slurry leakage and support deformation are found, and pouring is carried out after rectification and modification.
3) Setting a construction joint: and placing a wood tenon at the construction joint to form an internal and external height difference at the construction joint.
4) And (5) maintenance: in order to reduce water dispersion and plastic cracking of the concrete, after the concrete is initially set, wet linen is adopted for covering, and watering is carried out in time, so that the concrete can dissipate heat in time, and the curing period is not shorter than 14 days. In addition, the mold stripping time is prolonged and should be more than 3 days, preferably 7 days later.
5) Construction joint treatment measures
(1) When concrete is continuously poured at the construction joint, the compressive strength of the poured concrete must reach more than 1.2 Mpa. During construction of construction joints, cement film and loose stones are removed from the surface of hardened concrete, construction joint battens are removed, simultaneously, roughening is carried out, the concrete is washed clean and sufficiently moistened by water, and accumulated water remained on the surface of the concrete is removed.
(2) The impurities such as oil stain, cement mortar and rust on the steel bars are also removed.
The process flow comprises the following steps: according to the structural characteristics, the wall thickness change and the template specification of the dome, the configuration of the dome internal mold template in the engineering construction is completed at one time and the dome internal mold template is installed to the top at one time by considering the factors of concrete pouring and the like. Binding the bottom layer steel bars at one time; the external mold template has the same arc lines at each section, but different chord dip angles, and the spherical crown part adopts a single-side formwork because the chord dip angle is smaller.
External mold erection, outside reinforcement and concrete pouring are divided into six construction sections: from bottom to top, the bottom ring beam is a first construction section, four construction sections are divided according to the template specification in the middle of the range of 73-37.1 degrees of lower inclination angles, and the top spherical crown part is a sixth construction section.
Process flow
Measurement of line release →
Set up full hall frame and outer scaffold →
Formwork support, steel bar binding, concrete pouring, maintenance and formwork removal in first construction section →
Dome internal mold erecting → inner side two-way reinforcing steel bar binding →
Second construction section bind outside reinforcing bar, prop up external mold, pour concrete, maintenance, tear external mold open →
Binding outside steel bars, supporting external mold, pouring concrete, curing and removing external mold → in the third construction section
Binding outside steel bars, supporting and external mold, pouring concrete, curing and removing mold in the fourth construction section →
Binding outside steel bars, supporting external mold, pouring concrete, curing and removing external mold → in the fifth construction section
Sixth construction segment binding steel bar, pouring concrete → maintenance
5.3 measurement of pay-off
And (4) discharging the center point of the circular arc of the plane of the dome, making a cross perpendicular line through the center of the circular arc, and snapping a line on the concrete floor. And guiding a dome elevation control line.
5.4 formwork support
5.4.1 Stent set-up parameter determination
The dome template support adopts a fastener type full scaffold, the vertical rods are distributed in a radial mode, the maximum distance is 1000mm multiplied by 1000mm, and the step distance of the support body is 1600 mm. A small cross bar and a small vertical rod are additionally arranged at a position close to a dome so as to reinforce the corrugated steel, and the small cross bar is connected with at least two main vertical rods.
5.4.2 the bottom end of the upright stanchion is provided with a 150X150X10 steel backing plate, and the upper part is fully paved with a scaffold board.
5.4.3 construction requirements
In order to ensure the stability and rigidity of the full-hall frame body of the dome, each step of the full-hall frame body of the dome is connected with a main structure column, meanwhile, scissor braces are additionally arranged in X, Y, Z three directions of the full-hall frame, a layer of horizontal scissor braces are arranged every two steps of the frame along the vertical direction, and a single inclined rod of each horizontal scissor brace penetrates through 6 horizontal rods and forms an included angle of 45-60 degrees with the horizontal rods; vertical bridging is respectively arranged 4 vertically and horizontally, and a single diagonal bar of vertical bridging passes 6 pole settings, and 45 ~ 60 with ground contained angle.
5.5 template engineering
5.5.1 the template adopts a 15mm thick multilayer board with the specification of 2400X1200X15mm, the inner and outer ring main edges adopt bent round steel pipes, and the vertical edges adopt 50X 100mm square wood.
5.5.2 the outer mold and the inner mold are connected through split bolts, the split bolts have the diameter of 14mm, the space is 400x 400mm, and the two ends are provided with baffle plates with the diameter of 50x 8mm for fixing the outer wall template and controlling the thickness of the dome wall. The separation blade has the screw thread, can be according to concrete slabs thickness adjustment interval.
5.5.3 when each section of concrete is poured, 50 multiplied by 100 battens are placed, step type construction joints are left, and the construction joints follow the principle of high inside and low outside.
The 5.5.4 annular inner and outer steel ridges are made of steel pipes with the diameter of 48 multiplied by 3.5mm, are subjected to on-site sample enlargement, are processed into circular arcs with the radius corresponding to the elevation, and are arranged at the vertical interval of 60cm along the arc wall.
5.5.5 the sixth construction section has gentle slope, and is designed according to the top plate template, and only a bottom die is erected.
5.6 protective layer of reinforcing bar
The dome reinforcing steel bar protection layer is designed according to a plate, a concrete cushion block with the thickness of 15mm is adopted, the cushion block is firmly bound with the longitudinal reinforcing steel bars, and the distance between the cushion block and the longitudinal reinforcing steel bars is 50 multiplied by 50 cm.
5.7 concrete engineering
5.7.1 concrete mixing ratio requirement
The strength grade of the dome concrete is C30 commercial concrete, the cement is 42.5 common Portland cement, the medium sand is adopted, the gravel is broken stone, and the concrete slump is as follows: 160-190 mm;
5.7.2 concrete mixing ratio
| Material | Cement | Sand | Stone | Water (W) | Water reducing agent | Fly ash | Expanding agent |
| Per cubic meter (kg) | 366 | 908 | 742 | 178 | 12．94 | 124 | 49 |
Claims (5)
1. A construction method of a large-span concrete dome structure is characterized by comprising the following steps: firstly, dividing the construction of a concrete dome structure into a first construction section, a second construction section, a third construction section, a fourth construction section, a fifth construction section and a sixth construction section; secondly, deformation observation: making four observation points on the outer mold of the dome in four directions, and arranging a special person to observe the plane displacement of the dome template and the frame body settlement during concrete pouring; thirdly, setting a construction joint: placing a wooden tenon at the construction joint to form an internal and external height difference at the construction joint; fourthly, maintenance: in order to reduce the water dispersion and plastic cracking of the concrete, after the concrete is initially set, wet linen is adopted for covering, and watering is carried out in time, so that the concrete can dissipate heat in time.
2. The method for constructing a large-span concrete dome structure according to claim 1, wherein the first step is: the method is characterized in that the dome frame is uniformly stressed, two automobile pumps are symmetrically used for discharging concrete, the concrete is poured by a clockwise layered slope propelling method along the circumferential direction, the concrete pouring speeds of two pouring points are kept consistent, the concrete is poured in a sixth construction section, only a bottom formwork is used, the concrete slump is required to be 140-160 mm so as to prevent flowing, the concrete is poured from bottom to top in layers, a vibrating rod is vibrated at a proper point to ensure that the concrete is compact but can not flow in a large amount, when the concrete is about to be initially set, a cover formwork is used for covering an accurate radian, then light is collected for three times, and finally a plastic film is covered.
3. The method for constructing a large-span concrete dome structure according to claim 1, wherein the first step is: the concrete is guaranteed to be fully dense, vibration is carried out on the outer side of the template in an auxiliary mode during pouring, concrete bubbles are completely discharged according to the vibration principle, the concrete surface does not sink, and vibration points are uniformly distributed.
4. The method of claim 1, wherein the curing period is not shorter than 14 days, and the demold time is extended to be longer than 3 days.
5. The method of claim 1, further comprising a construction joint treatment step, wherein the compressive strength of the poured concrete is required to be more than 1.2Mpa when the concrete is continuously poured at the construction joint, the cement film and loose stones are removed from the surface of the hardened concrete during the construction of the construction joint, the strips of the construction joint are removed, and simultaneously, the strips are roughened, washed clean with water and sufficiently wetted, and the accumulated water remaining on the surface of the concrete is removed.
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| CN201911010601.XA CN110905113A (en) | 2019-10-23 | 2019-10-23 | Construction method of large-span concrete dome structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111441525A (en) * | 2020-04-30 | 2020-07-24 | 山西四建集团有限公司 | Large-span dome support keel formwork connecting system and construction method |
| CN113585761A (en) * | 2021-09-09 | 2021-11-02 | 中建八局南方建设有限公司 | Construction platform structure of ultrahigh dome structure and construction method thereof |
| CN113653241A (en) * | 2021-08-04 | 2021-11-16 | 中国建筑第八工程局有限公司 | Construction method of large-span special-shaped curved surface concrete dome structure |
| CN114892874A (en) * | 2022-04-26 | 2022-08-12 | 中国核电工程有限公司 | Large-span dome of containment and construction method thereof |
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| CN101457551A (en) * | 2009-01-05 | 2009-06-17 | 中国人民解放军广州军区空军工程建设局 | Wide span arched house concrete construction process |
| CN110080517A (en) * | 2019-04-04 | 2019-08-02 | 上海建工二建集团有限公司 | The form frame system and its construction method of concrete shell dome structure |
| CN110306670A (en) * | 2018-05-29 | 2019-10-08 | 中国建筑第二工程局有限公司 | A kind of construction method of overlength primary and secondary truss and annulus truss dome steel structure |
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Patent Citations (4)
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| CN201232257Y (en) * | 2008-06-23 | 2009-05-06 | 华丰建设股份有限公司 | Special operation platform for cast-place construction of concrete floor type arch |
| CN101457551A (en) * | 2009-01-05 | 2009-06-17 | 中国人民解放军广州军区空军工程建设局 | Wide span arched house concrete construction process |
| CN110306670A (en) * | 2018-05-29 | 2019-10-08 | 中国建筑第二工程局有限公司 | A kind of construction method of overlength primary and secondary truss and annulus truss dome steel structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111441525A (en) * | 2020-04-30 | 2020-07-24 | 山西四建集团有限公司 | Large-span dome support keel formwork connecting system and construction method |
| CN113653241A (en) * | 2021-08-04 | 2021-11-16 | 中国建筑第八工程局有限公司 | Construction method of large-span special-shaped curved surface concrete dome structure |
| CN113653241B (en) * | 2021-08-04 | 2023-01-24 | 中国建筑第八工程局有限公司 | Construction method of large-span special-shaped curved surface concrete dome structure |
| CN113585761A (en) * | 2021-09-09 | 2021-11-02 | 中建八局南方建设有限公司 | Construction platform structure of ultrahigh dome structure and construction method thereof |
| CN114892874A (en) * | 2022-04-26 | 2022-08-12 | 中国核电工程有限公司 | Large-span dome of containment and construction method thereof |
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Application publication date: 20200324 |