CN107419849B - A kind of space prestressed ring beam of the shape of a saddle - Google Patents
A kind of space prestressed ring beam of the shape of a saddle Download PDFInfo
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- CN107419849B CN107419849B CN201710254714.9A CN201710254714A CN107419849B CN 107419849 B CN107419849 B CN 107419849B CN 201710254714 A CN201710254714 A CN 201710254714A CN 107419849 B CN107419849 B CN 107419849B
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- ring beam
- inner ring
- prestressed
- shape
- saddle
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
- E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed
-
- 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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/121—Construction of stressing jacks
Abstract
The present invention relates to a kind of space prestressed ring beams of shape of a saddle, the space prestressed ring beam of the shape of a saddle is by inner ring beam, outer-ring beam and radial girders composition, inner ring beam is connect by radial girders with outer-ring beam, the inner ring beam is that multispan cross-section continuously becomes absolute altitude prestressed concrete beam, the outer-ring beam is that multispan cross-section continuously becomes absolute altitude reinforced beam, the diameter rib to beam be single span cross-section horizontal reinforcement beams of concrete, it is circumferential in the inner ring beam that curved prestressing tendon is set simultaneously, straight-line prestressed muscle and regular reinforcement, the arrangement of the inner ring beam presstressed reinforcing steel and regular reinforcement are as follows: after the completion of regular reinforcement arrangement, within the scope of the framework of steel reinforcement that regular reinforcement is formed, first straight-line prestressed muscle is evenly arranged along beam section periphery, curved prestressing tendon is arranged between the straight-line prestressed muscle of top layer again, the inner ring beam and outer-ring beam It is connected with lower part concrete structure by cast-in-situ steel reinforced concrete bean column node, the cable-membrane analysis is connected with space shape of a saddle ring beam by sliding hinged-support, and the sliding hinged-support radial level restraint release, circumferential horizontal restraint retains.
Description
Technical field
The invention belongs to Structural Engineering prestressing technique field, in particular to a kind of space prestressed ring beam of the shape of a saddle.
Background technique
With a large amount of constructions of large span spatial structure, the application of prestressed girder gradually increases.In civil engineering structure, answer in advance
Power annular girder is using more generally in round building, and prestressed ring beam is mostly on the same horizontal plane, such ring beam
After forming an entirety, itself there is a greater stiffness, to increase after prestressing force be not in larger internal force redistribution, will not be to ring
Beam and other structures generate parasitic moment.However to be that multispan cross-section continuously becomes absolute altitude prestressing force mixed for the space prestressed ring beam of the shape of a saddle
Solidifying Tu Liang, although good appearance, power transmission is clear, and shape of a saddle prestressed ring beam overall stiffness is insufficient, answers in advance in shape of a saddle space
After increasing prestressing force in power ring beam, it may appear that biggish Internal Force Redistribution generates parasitic moment to ring beam.It is right in structure design at present
There is more requirement in ring beam intensity and toughness, ensure that the hoop effect of ring beam to a certain extent, but since a shape of a saddle space is pre-
NOL ring beam stress state complex, Internal Force Redistribution are larger.How to guarantee that shape of a saddle space ring beam has suitable rigidity and resists
Fragility energy, while beam moment of flexure itself and the parasitic moment as caused by prestressing force can be resisted again, it is problem to be solved in engineering.
Summary of the invention
The circumferential direction that the cable-membrane analysis of sShape features and shape of a saddle spatial loop beam support for shape of a saddle space structure transmits
Horizontal force leads to shape of a saddle space ring beam insufficient rigidity and has the problem of larger pulling force and moment of flexure, and the invention proposes one kind
The space prestressed ring beam of the shape of a saddle.This invention ensures that shape of a saddle space ring beam has suitable rigidity, ring beam crack is controlled
Width, and the moment of flexure that beam itself can be resisted and the parasitic moment as caused by prestressing force.
The present invention relates to a kind of space prestressed ring beam of shape of a saddle, the space prestressed ring beam of the shape of a saddle by inner ring beam,
Outer-ring beam and radial girders composition, inner ring beam are connect by radial girders with outer-ring beam, and the inner ring beam is that multispan cross-section continuously becomes
Absolute altitude prestressed concrete beam, the outer-ring beam are that multispan cross-section continuously becomes absolute altitude reinforced beam, and the diameter rib is to beam
For single span cross-section horizontal reinforcement beams of concrete, the circumferential curved prestressing tendon, straight-line prestressed of being arranged simultaneously in the inner ring beam
Muscle and regular reinforcement, the arrangement of the inner ring beam presstressed reinforcing steel and regular reinforcement are as follows: after the completion of regular reinforcement arrangement, general
Within the scope of the framework of steel reinforcement that logical reinforcing bar is formed, first straight-line prestressed muscle is evenly arranged along beam section periphery, then curve is answered in advance
Power muscle is arranged between the straight-line prestressed muscle of top layer, and the inner ring beam and outer-ring beam and lower part concrete structure pass through cast in place reinforced bar
Concrete beam and column node is connected, and the cable-membrane analysis is connected with space shape of a saddle ring beam by sliding hinged-support, the sliding hinge
Support radial level restraint release, circumferential horizontal restraint retain.
Further, the inner ring beam uses hierarchical segmented tensioning, anchoring, and each section of presstressed reinforcing steel of the inner ring beam is adjacent
Tensioning is staggeredly overlapped between two stretching ends, inner ring beam tension of prestressed tendon end is set to reinforced concrete beam column node
/ 5th positions of two sides inner ring beam span, the stretching end pass through to reinforced concrete beam column node two sides inner ring beam span
1/5th ranges in carry out Horizontal hunche and formed.
Further, the strength grade of concrete of the inner ring beam, outer-ring beam and radial girders is C40.
Further, the prestressed ring beam uses post stretching bonded prestress technology, and presstressed reinforcing steel selects underrelaxation
Prestress wire, ultimate strength standard value are 1860MPa.
Further, tension of prestressed tendon proof stress is 1302Mpa, ultra stretching 3 percent when construction.
Beneficial effect
(1) curved prestressing tendon, straight-line prestressed muscle is arranged simultaneously in circumferential direction in the inner ring beam, wherein curved prestressing tendon
Solves the problems, such as inner ring beam bending resistance, straight-line prestressed muscle solves the problems, such as tension.
(2) presstressed reinforcing steel participates in bearing capacity in regular reinforcement jointly and calculates in the inner ring beam, and presstressed reinforcing steel both played
The effect of active force balance, improves the rigidity and cracking resistance of shape of a saddle prestressed ring beam.
(3) outer-ring beam and radial girders provide effective lateral support for inner ring beam and act on, outer-ring beam and radial girders
An entirety is formed with inner ring beam, common stress increases the transmitting road strength of power, postponed inner ring beam and lower part concrete structure
Connecting node is destroyed.
(4) inner ring beam ensure that entire inner ring beam using tensioning is staggeredly overlapped between two neighboring stretching end
Stress is continuous, tensioning is continuous.
(5) stretching end is formed by inner ring beam Horizontal hunche, is improved the rigidity of tensioning end position inner ring beam, is avoided
The too early buckling failure of tensioning end position inner ring beam.Allow tension of prestressed tendon anchoring more convenient simultaneously, more guarantee tensioning quality
And safety.
Detailed description of the invention
Fig. 1 is the space prestressed ring beam three-dimensional figure of the shape of a saddle；
Fig. 2 is the overall structure sectional view of the space prestressed ring beam of the shape of a saddle；
Fig. 3 is beam side haunch floor plan at inner ring girder tensioning；
Fig. 4 is that presstressed reinforcing steel staggeredly overlaps figure；
Fig. 5 is inner ring beam difference presstressed reinforcing steel arrangement form layout drawing；
Fig. 6 is inner ring beam A presstressed reinforcing steel layout drawing；
Fig. 7 is inner ring beam B presstressed reinforcing steel layout drawing；
Fig. 8 is inner ring beam C presstressed reinforcing steel layout drawing；
Fig. 9 is inner ring beam D presstressed reinforcing steel layout drawing；
Figure 10 is inner ring beam E presstressed reinforcing steel layout drawing；
Figure 11 is inner ring beam curved prestressing tendon curve graph；
Figure 12 is inner ring girder tensioning process；
Figure 13 is inner ring beam grading tension flow chart.
In each attached drawing: 1 inner ring beam；2 outer-ring beams；3 radial girt strips；The space prestressed ring beam of 4 shapes of a saddle；5 inner ring right cylinders；6
Outer ring batter post；7 sliding hinged-supports；8 cable-membrane analysis；9 lower part concrete structures；10 straight-line prestressed muscle；11 curved prestressing forces
Muscle；12 regular reinforcements；13 stretching ends.
Specific embodiment
By taking certain stadium project as an example, to illustrate the space prestressed ring beam of the shape of a saddle of the present invention.
1. equal part arranges more inner ring right cylinders 5 and outer ring batter post 6 first, thing is high, and north and south is low, as shown in Figure 1, Figure 2, Fig. 6 institute
Show.Interior annulated column 5 and outer annulated column 6 are up to 38.5 meters, and minimum 22.7 meters, the maximum height difference of inner ring right cylinder 5 is 15.8 meters, outer ring
The maximum height difference of right cylinder 6 is 15.8 meters, and the spacing of each inner ring right cylinder 5 is 20 meters, and the spacing of each outer ring batter post 6 is 22 meters, interior
The minimum range that the top of ring right cylinder 5 and outer ring batter post 6 push up is 10 meters, and the minimum range at 6 bottom of 5 bottom of inner ring right cylinder and outer ring batter post is 16
Rice.
2. the space prestressed ring beam 4 of the shape of a saddle then is arranged at the top of 5 top of inner ring right cylinder and outer ring batter post 6, inner ring is straight
5 top mark height of column and 6 top mark height of outer ring batter post are attached thereto the back absolute altitude at place with the space prestressed ring beam of the shape of a saddle, inner ring beam,
Outer-ring beam, radial rib beam section are rectangular beam, and the span of inner ring beam is 20m, and section is 1.5 meters high, 2 meters wide；Outer-ring beam across
Degree is 22 meters, and section is 1.2 meters high, 2 meters wide.The span of radial girt strip is 10 meters, and section is 1.5 meters high.
3. the space prestressed ring beam 4 of the shape of a saddle is made of inner ring beam 1, outer-ring beam 2, radial girt strip 3, as shown in Figure 1.Inner ring
1 tension of prestressed tendon end of beam is set to each 4 meters of the position in reinforced concrete beam column node two sides, and stretching end passes through to reinforced concrete
Horizontal hunche is carried out within the scope of 4 meters of native bean column node two sides and is formed, and haunching width is 0.5 meter, as shown in Figure 3.Inner ring beam 1
Factually border stress condition, use inner ring beam A, inner ring beam B, inner ring beam C, five kinds of inner ring beam D, inner ring beam E form of reinforcement, five kinds
The distribution map of form of reinforcement beam is as shown in Figure 5.Five kinds of arrangement of reinforcement layout drawings are as shown in Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10.First, in accordance with
General sequence of construction completion outer-ring beam is poured with radial girt strip, is then constructed to inner ring beam.
4. the sequence of construction of inner ring beam 1 are as follows: after the skeleton forming of regular reinforcement 12, to the position of straight-line prestressed muscle 10
It is marked with the position of 11 curvilinear coordinate of curved prestressing tendon, welding positioning bar, the auditory localization cues of curved prestressing tendon 11 are such as
Shown in Figure 11.Next bellows and prestress wire are penetrated, then position by bellows and prestress wire solid
It is fixed, then in the installation of tensioning end position, fixed stretching end anchor slab, propped up tensioning Side Template, place stretch-draw jack, to
The concealed works such as straight-line prestressed muscle 10, curved prestressing tendon 11 and the regular reinforcement 12 fixed are installed and carry out passed examination
Afterwards, casting concrete and curing concrete are removed the side form of inner ring beam 1, after checking that concrete quality is qualified to inner ring beam 1
Carry out hierarchical segmented tensioning.The installation procedure of inner ring beam 1 is as shown in figure 12.
5. hierarchical segmented stretching process is, divide five stages by the 20% of control stress for prestressing, 40%, 60%, 80%, 100%,
As shown in figure 13；Tensioning direction be counterclockwise, by due east across, due south across, due west across and due north across four across, every time
Simultaneous tension four is across 40 bridges are divided into 10 batches, and successively pressurization carries out tensioning step by step, and it is entire pre- to be always divided into 50 stages completions
The load of stress.Inner ring beam is respectively staggeredly overlapped tensioning between two neighboring stretching end across presstressed reinforcing steel, as shown in Figure 4.
6. installation sliding hinged-support 7 and top cable-membrane analysis 8 after inner ring girder tensioning, so that prestressed ring beam is in work
Make state.
Claims (8)
1. a kind of space prestressed ring beam of the shape of a saddle, is made of, it is characterised in that: inner ring beam inner ring beam, outer-ring beam and radial girders
It is connect by radial girders with outer-ring beam, the inner ring beam is that multispan cross-section continuously becomes absolute altitude prestressed concrete beam, described outer
Ring beam is that multispan cross-section continuously becomes absolute altitude reinforced beam, and the radial girders are single span cross-section horizontal reinforcement concrete
Beam, circumferential in the inner ring beam that curved prestressing tendon, straight-line prestressed muscle and regular reinforcement is arranged simultaneously, the inner ring beam is answered in advance
The arrangement of power muscle and regular reinforcement are as follows: after the completion of regular reinforcement arrangement, within the scope of the framework of steel reinforcement that regular reinforcement is formed,
First straight-line prestressed muscle is evenly arranged along beam section periphery, then by curved prestressing tendon be arranged in the straight-line prestressed muscle of top layer it
Between, the inner ring beam and outer-ring beam are connected with lower part concrete structure by cast-in-situ steel reinforced concrete bean column node, top rope film
Structure is connected with the space prestressed ring beam of the shape of a saddle by sliding hinged-support, the sliding hinged-support radial level restraint release,
Circumferential horizontal restraint retains.
2. the space prestressed ring beam of a kind of shape of a saddle according to claim 1, it is characterised in that: the inner ring beam, which uses, to be divided
Grade subsection tension, anchoring, each section of presstressed reinforcing steel of the inner ring beam is staggeredly overlapped tensioning between two neighboring stretching end, described
Inner ring beam tension of prestressed tendon end is set to 1/5th positions of reinforced concrete beam column node two sides inner ring beam span, described
Stretching end shape and the interior progress Horizontal hunche of 1/5th ranges to reinforced concrete beam column node two sides inner ring beam span
At.
3. the space prestressed ring beam of a kind of shape of a saddle according to claim 1, it is characterised in that: the inner ring beam, outer ring
Beam and the strength grade of concrete of radial girders are C40.
4. the space prestressed ring beam of a kind of shape of a saddle according to claim 1, it is characterised in that: the prestressed ring beam is adopted
With post stretching bonded prestress technology, presstressed reinforcing steel selects low relaxed prestress steel strand, and ultimate strength standard value is
1860MPa。
5. the space prestressed ring beam of a kind of shape of a saddle according to claim 1, it is characterised in that: tension of prestressed tendon control
Stress is 1302Mpa, ultra stretching 3 percent when construction.
6. the space prestressed ring beam of a kind of shape of a saddle according to claim 5, it is characterised in that: first, in accordance with general construction
Sequence completes pouring for outer-ring beam and radial girders, then constructs to inner ring beam.
7. the space prestressed ring beam of a kind of shape of a saddle according to claim 1, it is characterised in that: the construction of inner ring beam (1)
Sequentially are as follows: position and curved prestressing tendon (11) after the skeleton forming of regular reinforcement (12), to straight-line prestressed muscle (10)
The position of curvilinear coordinate, welding positioning bar are marked, and bellows and prestress wire are next penetrated, then by bellows
Be fixed on the positioning with prestress wire, then in the installation of tensioning end position, fixed stretching end anchor slab, propped up stretching end mould
Plate places stretch-draw jack, to having installed the straight-line prestressed muscle (10) fixed, curved prestressing tendon (11) and common
After reinforcing bar (12) carries out passed examination, casting concrete and curing concrete, after checking that concrete quality is qualified, by inner ring beam
(1) side form is removed, and carries out hierarchical segmented tensioning to inner ring beam (1).
8. the space prestressed ring beam of a kind of shape of a saddle according to claim 7, it is characterised in that: hierarchical segmented stretching process
To divide five stages by the 20% of control stress for prestressing, 40%, 60%, 80%, 100%；Tensioning direction is counter clockwise direction,
By due east across, due south across, due west across and due north across four across, each simultaneous tension four across, 40 bridges are divided into 10 batches,
Successively pressurization carries out tensioning step by step, is always divided into 50 entire prestressed loads of stages completion；Inner ring beam respectively exists across presstressed reinforcing steel
Tensioning is staggeredly overlapped between two neighboring stretching end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710254714.9A CN107419849B (en) | 2017-04-18 | 2017-04-18 | A kind of space prestressed ring beam of the shape of a saddle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710254714.9A CN107419849B (en) | 2017-04-18 | 2017-04-18 | A kind of space prestressed ring beam of the shape of a saddle |
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| CN107419849B true CN107419849B (en) | 2019-06-14 |
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| CN109113181B (en) * | 2018-08-27 | 2021-01-01 | 上海交通大学 | Large-span upper-layer-connected square inner ring saddle-shaped double-layer cable rod tensioning structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1978803A (en) * | 2005-12-06 | 2007-06-13 | 杨中源 | Super-length saddle prestressed ring beam seamless construction method |
| CN104975670A (en) * | 2015-06-25 | 2015-10-14 | 天津大学建筑设计研究院 | Combined-type cable dome structure for elliptic plane with unequal-height boundary |
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| AU8488975A (en) * | 1974-10-14 | 1976-03-18 | Durack M J | Swimming pool |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1978803A (en) * | 2005-12-06 | 2007-06-13 | 杨中源 | Super-length saddle prestressed ring beam seamless construction method |
| CN104975670A (en) * | 2015-06-25 | 2015-10-14 | 天津大学建筑设计研究院 | Combined-type cable dome structure for elliptic plane with unequal-height boundary |
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