CN107035067A - Variable cross-section structure of stiffened beam and construction method thereof - Google Patents
Variable cross-section structure of stiffened beam and construction method thereof Download PDFInfo
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- CN107035067A CN107035067A CN201710437481.6A CN201710437481A CN107035067A CN 107035067 A CN107035067 A CN 107035067A CN 201710437481 A CN201710437481 A CN 201710437481A CN 107035067 A CN107035067 A CN 107035067A
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- 238000010276 construction Methods 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 196
- 239000010959 steel Substances 0.000 claims abstract description 196
- 230000002787 reinforcement Effects 0.000 claims abstract description 33
- 239000004567 concrete Substances 0.000 claims abstract description 13
- 125000006850 spacer group Chemical group 0.000 claims description 38
- 210000003205 muscle Anatomy 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 10
- 239000003351 stiffener Substances 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 31
- 210000002435 tendon Anatomy 0.000 description 6
- 239000011241 protective layer Substances 0.000 description 4
- 210000000988 bone and bone Anatomy 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 108010068370 Glutens Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 235000021312 gluten Nutrition 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
- E04C3/293—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
A variable cross-section structure of a stiffened beam and a construction method thereof are provided, wherein the variable cross-section structure of the stiffened beam comprises a profile steel keel, a steel reinforcement framework arranged around the profile steel keel and beam concrete poured outside the profile steel keel and the steel reinforcement framework; the steel keel is of a variable cross-section structure, and the boundary of the steel keel self-variable cross section is divided into a first section of steel keel and a second section of steel keel; the steel bar framework comprises a beam top main bar and a beam bottom main bar; the beam top main rib is disconnected at the boundary of the variable cross section and is divided into a first section of beam top main rib and a second section of beam top main rib; one end of the first section of beam top main rib is connected with the corresponding stiff column on one side, and the other end of the first section of beam top main rib is connected with the vertical connecting plate; one end of the second section of beam top main rib is connected with the stiff column on the corresponding side, and the other end of the second section of beam top main rib is bent downwards at the dividing position of the variable cross section and is correspondingly connected with one group of vertical connecting plates. The invention solves the technical problem that a plurality of rows of major-diameter main ribs in the traditional variable cross-section stiff beam are difficult to connect at the position of the abrupt change cross section.
Description
Technical field
The invention belongs to building engineering field, the variable section structure and its construction method of particularly a kind of stiff beam.
Background technology
At present, stiffness structure extensive utilization in super high rise structure, stiffness structure be by reinforcing bar reinforced concrete enveloped and
A kind of new composite structure formed, this new structure has higher bearing capacity, higher ductility, preferable durability and resistance to
The advantages of fire, but stiffness structure, because of its construction features, often node is more complicated, and the arrangement of reinforcing bar and connection are relatively difficult,
Actual difficulty is big in constructing at the scene, one of key factor often as restriction duration and construction quality, particularly many to having
The variable cross-section stiff beam of major diameter cage bar is arranged, its span is big, section is big, the abrupt change of cross-section is obvious, cage bar diameter is big, the number of plies is more,
More rare in practice of construction, its construction method is different from conventional stiff beam, and the arrangement and connection processing requirement to beam main tendon are very
It is high, it is necessary to strengthen to the connection design and construction control of variable cross-section stiffness beam main tendon.
The content of the invention
It is an object of the invention to provide a kind of variable section structure of stiff beam and its construction method, to solve traditional change and cut
Multiple rows of major diameter cage bar connects difficult technical problem in abrupt-change cross section position in the stiff beam of face.
To achieve these goals, the present invention is adopted the following technical scheme that.
A kind of variable section structure of stiff beam, its two ends are connected with stiffened column respectively, include shaped steel keel, be arranged in type
The framework of steel reinforcement of steel joist surrounding and the beam concrete being cast on the outside of shaped steel keel and framework of steel reinforcement；The shaped steel keel are
Variable section structure, the shaped steel keel are divided into first paragraph shaped steel keel and second segment shaped steel keel from the boundary of variable cross-section；It is described
The bottom surface of first paragraph shaped steel keel is concordant with the bottom surface of second segment shaped steel keel, and the height of first paragraph shaped steel keel is less than second
The height of segment type steel joist；Erected at the top surface of the first paragraph shaped steel keel, close second segment shaped steel keel position provided with one group
To connecting plate；The cross section of the vertical connecting plate and shaped steel keel be arranged in parallel, and one group of vertical connecting plate is along shaped steel keel
Long axis direction parallel interval arrangement；The top surface of first paragraph shaped steel keel and second segment the shaped steel keel, along shaped steel keel
Long axis direction be equipped with Steel bar rack；The framework of steel reinforcement includes back cage bar and beam bottom cage bar；The back cage bar
At least 2 layers, and disconnected in the boundary of variable cross-section, it is divided into first paragraph back cage bar and second segment back cage bar；Described first
One end of section back cage bar is connected by connector with the stiffened column of corresponding side, and the other end of first paragraph back cage bar is by connecing
Device is refuted to be connected with outermost vertical connecting plate；One end of the second segment back cage bar passes through strength of the connector with corresponding side
Property post connection, the other end of second segment back cage bar bends downwards connect corresponding with one group of vertical connecting plate in the boundary of variable cross-section
Connect；Wherein undermost second segment back cage bar is supported on Steel bar rack；At least 2 layers of beam bottom cage bar, and elongated cloth
Put below shaped steel keel；The two ends of beam bottom cage bar are connected by connector with the stiffened column of corresponding side respectively.
It is preferred that, the shaped steel keel are I-steel or H profile steel.
It is preferred that, the height of vertical connecting plate is incremented by successively from outside to inside described in one group；The quantity of the vertical connecting plate
No less than the number of plies of second segment back cage bar, wherein being connected to layer second segment back cage bar on the vertical connecting plate of same, no
With the connection corresponding with one group of vertical connecting plate of layer second segment back cage bar, and it is non-intersect vertical.
It is preferred that, between the vertical connecting plate and vertical connecting plate, the second segment type of vertical connecting plate and corresponding side
Horizontal power transmission strength plate is respectively connected between steel joist end face.
It is preferred that, it is equipped with one group at the first paragraph shaped steel keel web both sides, the position of the vertical connecting plate of correspondence and erects
To stiffener；The vertical stiffener is corresponded with vertical connecting plate and arranged；
The second segment shaped steel keel web both sides are equipped with one group of sash plate；One group of sash plate vertically, it is parallel
Arranged for interval is in the corresponding position of vertical connecting plate.
It is preferred that, the framework of steel reinforcement also includes spacer bar, stirrup and vertically parallel interval is arranged on shaped steel dragon
The web reinforcement of bone web both sides；
The spacer bar is set parallel to the short-axis direction of shaped steel keel, and the major axis with layer spacer bar along shaped steel keel
Direction parallel interval arrangement；The spacer bar includes back spacer bar and beam bottom spacer bar；The back positions steel
Muscle is arranged between adjacent two layers first paragraph back cage bar and between adjacent two layers second segment back cage bar；The beam bottom positioning
Steel-bar arrangement is between the cage bar of adjacent two layers beam bottom；
The stirrup hoop is located between the both sides of shaped steel keel, back cage bar and beam bottom cage bar；And stirrup is in spacer bar position
Place is welded to connect with spacer bar；
The web reinforcement includes web longitudinal reinforcement and web dowel；The web longitudinal reinforcement at least two, and
Arranged along the short-axis direction parallel interval of shaped steel keel；The web dowel be connected to adjacent two web longitudinal reinforcements it
Between.
It is preferred that, the first paragraph back cage bar is by two sections of first paragraph back cage bar units by connecting the first bush whorl
It is formed by connecting；The second segment back cage bar is formed by connecting by two sections of second segment back cage bar units by connecting second sleeve；
Beam bottom cage bar is formed by connecting by two sections of beam bottom cage bar units by 3rd sleeve；First sleeve, second sleeve and
Internal thread is equipped with three sleeves.
A kind of construction method of the variable section structure of stiff beam, including step are as follows.
Step one, vertical connecting plate is connected to the top of first paragraph shaped steel keel, close to second segment shaped steel keel position
Place, the quantity of vertical connecting plate is no less than the number of plies of back cage bar；Simultaneously in first paragraph shaped steel keel and second segment shaped steel keel
Top surface, along the long axis direction of shaped steel keel, Steel bar rack is set respectively.
Step 2, the shaped steel keel in step one are connected between adjacent two stiffened column.
Step 3, back cage bar, the back cage bar are successively arranged at the top of shaped steel keel according to order from bottom to top
Disconnected in the boundary of variable cross-section, be divided into first paragraph back cage bar and second segment back cage bar；Wherein, the first paragraph beam of the bottom
Top cage bar and the second segment back cage bar of the bottom are arranged on Steel bar rack；By one end of first paragraph back cage bar by connecing
Refute device to connect with the stiffened column of corresponding side, the other end is connected by connector with outermost vertical connecting plate；By second segment
One end of back cage bar is connected by connector with the stiffened column of corresponding side, and the other end is bent downwards in the boundary of variable cross-section
It is corresponding with one group of vertical connecting plate to connect.
Step 4, beam bottom cage bar is successively arranged in shaped steel keel bottoms according to top-down order；By beam bottom cage bar
Two ends are connected by connector with the stiffened column of corresponding side respectively.
Step 5, colligation stirrup；Stirrup hoop is located between the both sides of shaped steel keel, back cage bar and beam bottom cage bar.
Step 6, casting beams concrete；The concrete on the outside of first paragraph shaped steel keel and second segment shaped steel dragon are poured respectively
Beam concrete on the outside of bone.
It is preferred that, the top of first paragraph shaped steel keel and the top of second segment shaped steel keel are spaced and are connected with step one
Peg；It is welded to connect between the Steel bar rack and peg.
It is preferred that, when arranging first paragraph back cage bar and second segment back cage bar in step 3, each layer first paragraph back master
Arrange that back spacer bar is positioned between muscle and between each layer second segment back cage bar；First paragraph described in step 3
Back cage bar includes two sections of first paragraph back cage bar units, first will wherein one section first when connecting first paragraph back cage bar
Section back cage bar unit is connected by the stiffened column of connector and corresponding side, another section by connector and it is outermost vertically
Connecting plate is connected, then will be attached between two sections of first paragraph back cage bar units using the first sleeve；The second segment beam
Top cage bar includes two sections of second segment back cage bar units, first will wherein one section second segment when connecting second segment back cage bar
Back cage bar unit is connected by connector with the stiffened column of corresponding side, and another section of second segment back cage bar unit is in variable cross-section
Boundary bending downwards connected with one group of vertical connecting plate by the way that connector is corresponding, then by two sections of second segment back cage bar units
Between using second sleeve connection.
It is preferred that, when arranging beam bottom cage bar in step 4, the bottom of beam bottom cage bar is first held using interim steel pipe support,
Arrange that beam bottom spacer bar is positioned between each layer beam bottom cage bar；In step 4, beam bottom cage bar includes two sections of beam bottoms
Cage bar unit, at tie-beam bottom during cage bar, first passes through strength of the connector with corresponding side by the end of two sections of beam bottom cage bar units
Property post connection, then will be connected between two sections of beam bottom cage bar units by 3rd sleeve.
Compared with prior art the invention has the characteristics that and beneficial effect.
1st, present invention mainly solves the multiple rows of major diameter cage bar of variable cross-section stiff beam in abrupt-change cross section position connectivity problem,
On the premise of ensureing stiffness structure stress performance, optimization stiffness beam main tendon arrangement and connection, simplified Joint Re-bar Construction overcome existing
There is Reinforcement binding technique problem.
2nd, the beam in the present invention is variable cross-section stiff beam, and variable cross-section position back cage bar is separately connected, vertical by setting
Connecting plate, vertical stiffener, improve variable cross-section back cage bar connected mode, solve the multiple rows of major diameter master of variable cross-section stiff beam
The problem of muscle node processing is difficult so that variable cross-section stiffness beam stress clearly, convenient construction, ensure that safety and quality, accelerate
Construction speed.
3rd, the back cage bar and the two ends of beam bottom cage bar and stiffened column in the present invention are attached using connector, connector
It has been welded on stiffened column, when back cage bar and beam bottom cage bar are in the middle part of beam, has been carried out using long filament sleeve when stiffened column dispatches from the factory
Connection, solves stiff beam multilayer major diameter cage bar because overlap joint or the next bar spacing of welded bands do not meet the difficulty of code requirement
Topic, saved construction cost, accelerate construction speed, it is quality controllable.
4th, the stiff beam in the present invention, back cage bar and beam bottom cage bar set Steel bar rack by the peg on shaped steel keel
Ensure protective layer thickness, beam bottom cage bar ensures protective layer thickness by stirrup lifting effect, solves cover to reinforcement and spacing
The problem of being difficult to control to, has the advantages that convenient construction, quality controllable, cost-effective.
Brief description of the drawings
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Fig. 1 is the variable section structure side schematic view of the stiff beam of the present invention.
Fig. 2 is the structural representation that central sill bottom of the present invention spacer bar is connected by 3rd sleeve.
Fig. 3 is the cross-sectional view of the framework of steel reinforcement structure around medium-sized steel joist of the invention.
Reference：1- beams concrete, 2- shaped steel keel, 2.1- first paragraph shaped steel keel, 2.2- second segment shaped steel keel,
3- stiffened columns, 4- connectors, the sleeves of 5- first, 6- beams bottom cage bar, 7- backs cage bar, the first backs of 7.1- cage bar, 7.2- second
Back cage bar, 8- webs dowel, 9- second sleeves, 10- 3rd sleeves, the vertical connecting plates of 11-, the horizontal power transmission strength plates of 12-,
13- vertical stiffeners, 14- sash plate, 15- Steel bar racks, 16- pegs, 17- backs spacer bar, 18- stirrups, 19- beams
Bottom spacer bar, 20- web longitudinal reinforcements.
Embodiment
As Figure 1-3, the variable section structure of this stiff beam, its two ends are connected with stiffened column 3 respectively, include shaped steel
Keel 2, the framework of steel reinforcement for being arranged in the surrounding of shaped steel keel 2 and the beam coagulation being cast on the outside of shaped steel keel 2 and framework of steel reinforcement
Soil 1；The shaped steel keel 2 are variable section structure, and the shaped steel keel 2 are divided into first paragraph shaped steel keel from the boundary of variable cross-section
2.1 and second segment shaped steel keel 2.2；Stiff beam gluten is that back cage bar 7 is separately connected at the joist steel bone abrupt change of cross-section；Described
The bottom surface of one segment type steel joist 2.1 is concordant with the bottom surface of second segment shaped steel keel 2.2, and the height of first paragraph shaped steel keel 2.1
Less than the height of second segment shaped steel keel 2.2；The top surface of the first paragraph shaped steel keel 2.1, close second segment shaped steel keel 2.2
Provided with one group of vertical connecting plate 11 at position；The cross section of the vertical connecting plate 11 and shaped steel keel 2 be arranged in parallel, and one group
Long axis direction parallel interval arrangement of the vertical connecting plate 11 along shaped steel keel 2；The first paragraph shaped steel keel 2.1 and second segment
The top surface of shaped steel keel 2.2, along the long axis direction of shaped steel keel 2 it is equipped with Steel bar rack 15；The framework of steel reinforcement includes
Back cage bar 7 and beam bottom cage bar 6；At least 2 layers of the back cage bar 7, the diameter of back cage bar 7 is not less than 25mm, and is becoming
The boundary in section disconnects, and is divided into first paragraph back cage bar 7.1 and second segment back cage bar 7.2；The first paragraph back cage bar
7.1 one end is connected by connector 4 with the stiffened column of corresponding side, and the other end of first paragraph back cage bar 7.1 is by plugging into
Device 4 is connected with outermost vertical connecting plate 11；One end of the second segment back cage bar 7.2 passes through connector 4 and corresponding one
The stiffened column connection of side, the other end of second segment back cage bar 7.2 is bent downwards in the boundary of variable cross-section vertically to be connected with one group
The correspondence of fishplate bar 11 carries out welding by both sides connection（Weld length meets design requirement）；Wherein undermost second segment back cage bar 7.2
It is supported on Steel bar rack 15；At least 2 layers of beam bottom cage bar 6, the diameter of beam bottom cage bar 6 is not less than 25mm, and elongated cloth
Put below shaped steel keel 2；The two ends of beam bottom cage bar 6 are connected by connector 4 with the stiffened column of corresponding side respectively.
In the present embodiment, the two ends of the shaped steel keel 2 are connected with stiffened column 3, beam bottom cage bar 6 and back cage bar 7
Two ends are attached by connector 4 with stiffened column 3 respectively, and beam bottom cage bar 6 and back cage bar 7 are entered at middle part using long filament sleeve
Row connection；The connector 4 has been welded on when stiffened column 3 dispatches from the factory on stiffened column 3；Cage bar one end sleeve processing length in the middle part of i.e.
Just be equal to long filament length sleeve, long filament sleeve be all first screwed in beam bottom cage bar 6 or the middle part of back cage bar 7, treat with
Connection another Half Beam bottom cage bar 6 or back cage bar 7 in place afterwards by long filament sleeve backwards, be screwed into another Half Beam bottom cage bar 6
Or back cage bar 7.
In the present embodiment, the shaped steel keel 2 are I-steel or H profile steel；The size of variable cross-section stiff beam is by 1000 mm
× 3500mm (size of its Shaped Steel keel 2 is the mm of 2800mm × 600 × 50 mm × 60mm) sport 1000mm ×
2000mm (wherein, shaped steel keel 2 sport the mm of 1300mm × 600 × 50 mm × 60mm), back cage bar 7 is set to five layers
50C32 reinforcing bar, beam bottom cage bar 6 is set to three layers of 25C32 reinforcing bar；The two ends of back cage bar 7 and beam bottom cage bar 6 are by plugging into
Device 4 is connected on stiffened column 3, and back cage bar 7 and beam bottom cage bar 6 are attached at middle part using long filament sleeve；Second segment shaped steel
Three on keel 2.2 ranked second section back cage bar 7.2 is bent downwardly along variable cross-section side, the second segment back cage bar 7.2 stooped
With the progress overlap welding of vertical connecting plate 11 being welded on the top surface of first paragraph shaped steel keel 2.1, fusion length is 200mm, is erected
It is low inside and high outside to connecting plate 11；During back 7 colligation of cage bar, welded reinforcement support 15 ensures to protect on shaped steel keel 2 and peg 16
Covering thickness, according to the successively colligation of top-down order, shelves C25 backs spacer bar 17 layer by layer and protects between back cage bar 7
Demonstrate,prove bar spacing；During 6 colligation of cage bar of beam bottom, according to the successively colligation of top-down order, first held using interim steel pipe support
C25 beams bottom spacer bar 19 is placed between lower rebar, each layer beam bottom cage bar 6 ensures each layer bar spacing, final to utilize C14 hoops
Muscle 18 is positioned.
In the present embodiment, the shaped steel keel 2 are I-steel or H profile steel；Wherein, the height of first paragraph shaped steel keel 2.1
Spend for 1/2 or so of the height of second segment shaped steel keel 2.2.
In the present embodiment, the height of vertical connecting plate 11 is incremented by successively from outside to inside described in one group；The vertical connecting plate
11 quantity is identical with the reclinate number of plies of second segment back cage bar 7.2, wherein being connected to layer second segment back cage bar 7.2
On the vertical connecting plate 11 of same, different layers second segment back cage bar 7.2 is corresponding with one group of vertical connecting plate 11 to be connected, and perpendicular
It is non-intersect upwards.
In the present embodiment, between the vertical connecting plate 11 and vertical connecting plate 11, vertical connecting plate 11 and corresponding side
The end face of second segment shaped steel keel 2.2 between be respectively connected with horizontal power transmission strength plate 12.
In the present embodiment, it is all provided with the web both sides of first paragraph shaped steel keel 2.1, the position of the vertical connecting plate 11 of correspondence
There is one group of vertical stiffener 13；The vertical stiffener 13 is corresponded with vertical connecting plate 11 and arranged；The vertical stiffener
The web both sides of second segment shaped steel keel 2.2 of 13 sides are equipped with one group of sash plate 14；One group of sash plate 14 is along perpendicular
The corresponding position of vertical connecting plate 11 is arranged in, parallel interval.
In the present embodiment, the size of the vertical stiffener 13, the size of horizontal power transmission strength plate 12 and quantity, sash
The size of plate 14 all should be calculated according to power transmission with quantity, the size of vertical connecting plate 11 and quantity and determined, the present embodiment is according to change
Section stiffness beam main tendon row is more, the close feature of spacing, by setting vertical stiffener 13, horizontal power transmission strength plate 12, sash
Plate 14, power transmission is clear and definite, convenient construction；Secondly, beam tendon protective layer and spacing are met with long filament sleeve and Steel bar rack 15
It is required that.
In the present embodiment, the framework of steel reinforcement also includes spacer bar, stirrup 18 and vertically parallel interval is arranged on
The web reinforcement of the web both sides of shaped steel keel 2；The spacer bar is set parallel to the short-axis direction of shaped steel keel 2, and same layer
Long axis direction parallel interval arrangement of the spacer bar along shaped steel keel 2；The spacer bar includes back spacer bar 17
With beam bottom spacer bar 19；The back spacer bar 17 is arranged between adjacent two layers first paragraph back cage bar 7.1 and phase
Between adjacent two layers of second segment back cage bar 7.2；Beam bottom spacer bar 19 is arranged between adjacent two layers beam bottom cage bar 6；Institute
The hoop of stirrup 18 is stated to be located between the both sides of shaped steel keel 2, back cage bar 7 and beam bottom cage bar 6；And stirrup 18 is in spacer bar position
Place is welded to connect with spacer bar；The web reinforcement includes web longitudinal reinforcement 20 and web dowel 8；The web is indulged
Arranged to reinforcing bar 20 at least two, and along the short-axis direction parallel interval of shaped steel keel 2；The web dowel 8 is connected to
Between adjacent two web longitudinal reinforcements 20.
In the present embodiment, the first paragraph back cage bar 7.1 passes through connection first by two sections of first paragraph back cage bar units
The threaded connection of sleeve 5 is formed；The second segment back cage bar 7.2 is by two sections of second segment back cage bar units by connecting second set
Cylinder 9 is formed by connecting；Beam bottom cage bar 6 is formed by connecting by two sections of beam bottom cage bar units by 3rd sleeve 10；The first set
Internal thread is equipped with cylinder 5, second sleeve 9 and 3rd sleeve 10.
The construction method of the variable section structure of this stiff beam, including step are as follows.
Step one, vertical connecting plate 11 is connected to the top of first paragraph shaped steel keel 2.1, close to second segment shaped steel keel
At 2.2 positions, the quantity of vertical connecting plate 11 is no less than the number of plies of back cage bar 7；Simultaneously in first paragraph shaped steel keel 2.1 and the
The top surface of two segment type steel joists 2.2, along the long axis direction of shaped steel keel 2 Steel bar rack 15 is set respectively.
Step 2, the shaped steel keel 2 in step one are connected between adjacent two stiffened column 3.
Step 3, back cage bar 7, the back master are successively arranged at the top of shaped steel keel 2 according to order from bottom to top
Muscle 7 disconnects in the boundary of variable cross-section, is divided into first paragraph back cage bar 7.1 and second segment back cage bar 7.2；Wherein, the bottom
First paragraph back cage bar 7.1 and the second segment back cage bar 7.2 of the bottom be arranged on Steel bar rack 15, and pass through reinforcing bar
Support 15 is controlled, and Steel bar rack 15 is welded to connect on the peg 16 at the top of shaped steel keel 2, each layer second segment back cage bar
Back spacer bar 17 is placed between 7.2 ensures each layer bar spacing；One end of first paragraph back cage bar 7.1 is passed through into connector
4 are connected with the stiffened column of corresponding side, and the other end is connected by connector 4 with outermost vertical connecting plate 11；By second segment
One end of back cage bar 7.2 is connected by connector 4 with the stiffened column of corresponding side, and the other end is downward in the boundary of variable cross-section
Bending is corresponding with one group of vertical connecting plate 11 to be connected.
Step 4, beam bottom cage bar 6 is successively arranged in the bottom of shaped steel keel 2 according to top-down order；By beam bottom cage bar 6
Two ends pass through the stiffened column of connector 4 and corresponding side respectively and connect；When arranging beam bottom cage bar 6, first using interim steel pipe branch
Frame holds the bottom of beam bottom cage bar 6, arranges that beam bottom spacer bar 19 is positioned between each layer beam bottom cage bar 6, it is ensured that each layer
Bar spacing.
Step 5, colligation stirrup 18；Stirrup 18 is bound round to both sides, back cage bar 7 and the beam bottom cage bar 6 for being located at shaped steel keel 2
Between.
Step 6, casting beams concrete 1；The concrete and the second segment type in the outside of first paragraph shaped steel keel 2.1 are poured respectively
The beam concrete 1 in the outside of steel joist 2.2.
In the present embodiment, the top of first paragraph shaped steel keel 2.1 and the top of second segment shaped steel keel 2.2 are equal in step one
Interval is connected with peg 16；It is welded to connect between the Steel bar rack 15 and peg 16.
In the present embodiment, when arranging first paragraph back cage bar 7.1 and second segment back cage bar 7.2 in step 3, each layer the
Arrange that back spacer bar 17 is positioned between one section of back cage bar 7.1 and between each layer second segment back cage bar 7.2；
In step 3, the first paragraph back cage bar 7.1 includes two sections of first paragraph back cage bar units, in connection first paragraph back master
During muscle 7.1, first wherein one section first paragraph back cage bar unit is connected by connector 4 with the stiffened column of corresponding side, it is another
Section is connected by connector 4 with outermost vertical connecting plate 11, then will be used between two sections of first paragraph back cage bar units
First sleeve 5 is attached；The second segment back cage bar 7.2 includes two sections of second segment back cage bar units, in connection the
During two sections of back cage bars 7.2, wherein one section second segment back cage bar unit is first passed through into stiffened column of the connector 4 with corresponding side
Connection, another section of second segment back cage bar unit is bent with one group of vertical connecting plate 11 by connecing downwards in the boundary of variable cross-section
The correspondence connection of device 4 is refuted, then will be connected between two sections of second segment back cage bar units using second sleeve 9；Step in the present embodiment
In four, beam bottom cage bar 6 includes two sections of beam bottom cage bar units, at tie-beam bottom during cage bar 6, first by two sections of beam bottom cage bar lists
The end of member is connected by connector 4 with the stiffened column of corresponding side, then will pass through the 3rd set between two sections of beam bottom cage bar units
Cylinder 10 is connected.
In the present embodiment, the connector 4 has been welded on when stiffened column 3 dispatches from the factory on stiffened column 3.
According to variable cross-section stiff beam design idea and loading characteristic, stiffness beam section is mutated in the height direction, stiff beam
Cage bar is separately connected in variable cross-section position, according to variable cross-section stiffness beam main tendon row is more, the close feature of spacing, by set strength plate,
Power transmission strength plate, reinforcement strength plate, power transmission is clear and definite, convenient construction；Secondly, beam muscle is met with long filament sleeve and Steel bar rack 15
Protective layer and pitch requirements.
Claims (10)
1. a kind of variable section structure of stiff beam, its two ends respectively with stiffened column（3）It is connected, includes shaped steel keel（2）, arrangement
In shaped steel keel（2）The framework of steel reinforcement of surrounding and it is cast in shaped steel keel（2）With the beam concrete on the outside of framework of steel reinforcement（1）；
It is characterized in that：The shaped steel keel（2）For variable section structure, the shaped steel keel（2）It is divided into first from the boundary of variable cross-section
Segment type steel joist（2.1）With second segment shaped steel keel（2.2）；The first paragraph shaped steel keel（2.1）Bottom surface and the second segment type
Steel joist（2.2）Bottom surface it is concordant, and first paragraph shaped steel keel（2.1）Height be less than second segment shaped steel keel（2.2）Height
Degree；The first paragraph shaped steel keel（2.1）Top surface, close to second segment shaped steel keel（2.2）Vertically connect provided with one group at position
Fishplate bar（11）；The vertical connecting plate（11）With shaped steel keel（2）Cross section be arranged in parallel, and one group of vertical connecting plate（11）
Along shaped steel keel（2）Long axis direction parallel interval arrangement；The first paragraph shaped steel keel（2.1）With second segment shaped steel keel
（2.2）Top surface, along shaped steel keel（2）Long axis direction be equipped with Steel bar rack（15）；The framework of steel reinforcement includes beam
Push up cage bar（7）With beam bottom cage bar（6）；The back cage bar（7）At least 2 layers, and disconnected in the boundary of variable cross-section, it is divided into the
One section of back cage bar（7.1）With second segment back cage bar（7.2）；The first paragraph back cage bar（7.1）One end by plugging into
Device（4）Connected with the stiffened column of corresponding side, first paragraph back cage bar（7.1）The other end pass through connector（4）With outermost
Vertical connecting plate（11）Connection；The second segment back cage bar（7.2）One end pass through connector（4）With the strength of corresponding side
Property post connection, second segment back cage bar（7.2）The other end bent and one group of vertical connecting plate downwards in the boundary of variable cross-section
（11）Correspondence connection；Wherein undermost second segment back cage bar（7.2）It is supported on Steel bar rack（15）On；Beam bottom cage bar
（6）At least 2 layers, and elongated it is arranged in shaped steel keel（2）Lower section；Beam bottom cage bar（6）Two ends pass through connector respectively
（4）Connected with the stiffened column of corresponding side.
2. a kind of variable section structure of stiff beam according to claim 1, it is characterised in that：The shaped steel keel（2）For
I-steel or H profile steel.
3. a kind of variable section structure of stiff beam according to claim 2, it is characterised in that：Vertical connecting plate described in one group
（11）Height it is incremented by successively from outside to inside；The vertical connecting plate（11）Quantity be no less than second segment back cage bar（7.2）
The number of plies, wherein with layer second segment back cage bar（7.2）It is connected to the vertical connecting plate of same（11）On, different layers second segment beam
Push up cage bar（7.2）With one group of vertical connecting plate（11）Correspondence connection, and it is non-intersect vertical.
4. a kind of variable section structure of stiff beam according to claim 3, it is characterised in that：The vertical connecting plate（11）
With vertical connecting plate（11）Between, vertical connecting plate（11）With the second segment shaped steel keel of corresponding side（2.2）Between end face
It is connected with horizontal power transmission strength plate（12）.
5. a kind of variable section structure of stiff beam according to claim 4, it is characterised in that：The first paragraph shaped steel keel
（2.1）Web both sides, the vertical connecting plate of correspondence（11）Position at be equipped with one group of vertical stiffener（13）；It is described vertically to put more energy into
Plate（13）With vertical connecting plate（11）Correspond arrangement；
The second segment shaped steel keel（2.2）Web both sides are equipped with one group of sash plate（14）；One group of sash plate
（14）Vertically, parallel interval is arranged in vertical connecting plate（11）Corresponding position.
6. a kind of variable section structure of stiff beam according to claim 2, it is characterised in that：The framework of steel reinforcement also includes
There are spacer bar, stirrup（18）Vertically parallel interval is arranged on shaped steel keel（2）The web reinforcement of web both sides；It is described fixed
Position parallel reinforced steel bar is in shaped steel keel（2）Short-axis direction set, and with layer spacer bar along shaped steel keel（2）Long axis direction
Parallel interval is arranged；The spacer bar includes back spacer bar（17）With beam bottom spacer bar（19）；The back is determined
Position reinforcing bar（17）It is arranged on adjacent two layers first paragraph back cage bar（7.1）Between and adjacent two layers second segment back cage bar
（7.2）Between；Beam bottom spacer bar（19）It is arranged on adjacent two layers beam bottom cage bar（6）Between；The stirrup（18）Hoop is set
In shaped steel keel（2）Both sides, back cage bar（7）With beam bottom cage bar（6）Between；And stirrup（18）At spacer bar position with
Spacer bar is welded to connect；The web reinforcement includes web longitudinal reinforcement（20）With web dowel（8）；The web is indulged
To reinforcing bar（20）At least two, and along shaped steel keel（2）Short-axis direction parallel interval arrangement；The web dowel（8）
It is connected to adjacent two web longitudinal reinforcements（20）Between.
7. a kind of variable section structure of stiff beam according to claim 2, it is characterised in that：The first paragraph back cage bar
（7.1）By two sections of first paragraph back cage bar units by connecting the first sleeve（5）Threaded connection is formed；The second segment back master
Muscle（7.2）By two sections of second segment back cage bar units by connecting second sleeve（9）It is formed by connecting；Beam bottom cage bar（6）By
Two sections of beam bottom cage bar units pass through 3rd sleeve（10）It is formed by connecting；First sleeve（5）, second sleeve（9）With the 3rd set
Cylinder（10）On be equipped with internal thread.
8. a kind of construction method of the variable section structure of the stiff beam in claim 1-7 described in any one, it is characterised in that
It is as follows including step：
Step one, by vertical connecting plate（11）It is connected to first paragraph shaped steel keel（2.1）Top, close to second segment shaped steel keel
（2.2）At position, vertical connecting plate（11）Quantity be no less than back cage bar（7）The number of plies；Simultaneously in first paragraph shaped steel keel
（2.1）With second segment shaped steel keel（2.2）Top surface, along shaped steel keel（2）Long axis direction Steel bar rack is set respectively
（15）；
Step 2, by the shaped steel keel in step one（2）It is connected to adjacent two stiffened column（3）Between；
Step 3, in shaped steel keel（2）Back cage bar is successively arranged in top according to order from bottom to top（7）, the back master
Muscle（7）Disconnected in the boundary of variable cross-section, be divided into first paragraph back cage bar（7.1）With second segment back cage bar（7.2）；Wherein,
The first paragraph back cage bar of the bottom（7.1）With the second segment back cage bar of the bottom（7.2）It is arranged in Steel bar rack（15）
On；By first paragraph back cage bar（7.1）One end pass through connector（4）Connected with the stiffened column of corresponding side, the other end passes through
Connector（4）With outermost vertical connecting plate（11）Connection；By second segment back cage bar（7.2）One end pass through connector
（4）Connected with the stiffened column of corresponding side, the other end is bent downwards and one group of vertical connecting plate in the boundary of variable cross-section（11）
Correspondence connection；
Step 4, in shaped steel keel（2）Beam bottom cage bar is successively arranged in bottom according to top-down order（6）；By beam bottom cage bar
（6）Two ends pass through connector respectively（4）Connected with the stiffened column of corresponding side；
Step 5, colligation stirrup（18）；By stirrup（18）Hoop is located at shaped steel keel（2）Both sides, back cage bar（7）With beam bottom master
Muscle（6）Between；
Step 6, casting beams concrete（1）；First paragraph shaped steel keel are poured respectively（2.1）The concrete in outside and the second segment type
Steel joist（2.2）The beam concrete in outside（1）.
9. the construction method of the variable section structure of stiff beam according to claim 8, it is characterised in that：In step one, the
One segment type steel joist（2.1）Top and second segment shaped steel keel（2.2）Top be spaced and be connected with peg（16）；The steel
Muscle support（15）With peg（16）Between be welded to connect.
10. the construction method of the variable section structure of stiff beam according to claim 8, it is characterised in that：
First paragraph back cage bar is arranged in step 3（7.1）With second segment back cage bar（7.2）When, each layer first paragraph back cage bar
（7.1）Between and each layer second segment back cage bar（7.2）Between arrange back spacer bar（17）Positioned；
In step 3, the first paragraph back cage bar（7.1）Include two sections of first paragraph back cage bar units, in connection first paragraph
Back cage bar（7.1）When, wherein one section first paragraph back cage bar unit is first passed through into connector（4）With the stiffened column of corresponding side
Connection, another section passes through connector（4）With outermost vertical connecting plate（11）Connection, then by two sections of first paragraph back cage bar lists
The first sleeve is used between member（5）It is attached；The second segment back cage bar（7.2）Include two sections of second segment back masters
Muscle unit, in connection second segment back cage bar（7.2）When, wherein one section second segment back cage bar unit is first passed through into connector
（4）Connected with the stiffened column of corresponding side, another section of second segment back cage bar unit the boundary of variable cross-section bend downwards with
One group of vertical connecting plate（11）Pass through connector（4）Correspondence connection, then the will be utilized between two sections of second segment back cage bar units
Two sleeves（9）Connection；
Beam bottom cage bar is arranged in step 4（6）When, beam bottom cage bar is first held using interim steel pipe support（6）Bottom, in each layer
Beam bottom cage bar（6）Between arrangement beam bottom spacer bar（19）Positioned；
In step 4, beam bottom cage bar（6）Include two sections of beam bottom cage bar units, in tie-beam bottom cage bar（6）When, first by two
The end of Duan Liang bottoms cage bar unit passes through connector（4）Connected with the stiffened column of corresponding side, then by two sections of beam bottom cage bar units
Between pass through 3rd sleeve（10）Connection.
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| CN201710437481.6A CN107035067B (en) | 2017-06-12 | 2017-06-12 | Variable cross-section structure of stiffened beam and construction method thereof |
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| CN201710437481.6A CN107035067B (en) | 2017-06-12 | 2017-06-12 | Variable cross-section structure of stiffened beam and construction method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107620486A (en) * | 2017-11-03 | 2018-01-23 | 华东建筑设计研究院有限公司 | The bar planting attachment structure of steel bar stress in a kind of beams of concrete |
| CN114016740A (en) * | 2021-12-14 | 2022-02-08 | 北京国际建设集团有限公司 | Construction method for seismic mitigation and isolation conversion layer of subway upper cover structure |
| CN114482403A (en) * | 2022-03-01 | 2022-05-13 | 中国建筑第八工程局有限公司 | Construction method of large-section stiff support column conversion beam in narrow space |
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| CN103866867A (en) * | 2014-03-21 | 2014-06-18 | 中建八局大连建设工程有限公司 | Split-level sealing and anchoring structure for multi-row main reinforcements of steel reinforced concrete combination giant pillar and construction process of split-level sealing and anchoring structure |
| CN105756287A (en) * | 2016-03-24 | 2016-07-13 | 中国建筑第八工程局有限公司 | Reverse-hanging steel bar arrangement construction method for stiff steel reinforced beams and prop steel bars |
| CN206903061U (en) * | 2017-06-12 | 2018-01-19 | 中建一局集团第一建筑有限公司 | Variable cross-section structure of stiff beam |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866867A (en) * | 2014-03-21 | 2014-06-18 | 中建八局大连建设工程有限公司 | Split-level sealing and anchoring structure for multi-row main reinforcements of steel reinforced concrete combination giant pillar and construction process of split-level sealing and anchoring structure |
| CN105756287A (en) * | 2016-03-24 | 2016-07-13 | 中国建筑第八工程局有限公司 | Reverse-hanging steel bar arrangement construction method for stiff steel reinforced beams and prop steel bars |
| CN206903061U (en) * | 2017-06-12 | 2018-01-19 | 中建一局集团第一建筑有限公司 | Variable cross-section structure of stiff beam |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107620486A (en) * | 2017-11-03 | 2018-01-23 | 华东建筑设计研究院有限公司 | The bar planting attachment structure of steel bar stress in a kind of beams of concrete |
| CN114016740A (en) * | 2021-12-14 | 2022-02-08 | 北京国际建设集团有限公司 | Construction method for seismic mitigation and isolation conversion layer of subway upper cover structure |
| CN114016740B (en) * | 2021-12-14 | 2022-11-18 | 北京国际建设集团有限公司 | Construction method for seismic mitigation and isolation conversion layer of subway upper cover structure |
| CN114482403A (en) * | 2022-03-01 | 2022-05-13 | 中国建筑第八工程局有限公司 | Construction method of large-section stiff support column conversion beam in narrow space |
| CN114482403B (en) * | 2022-03-01 | 2023-09-01 | 中国建筑第八工程局有限公司 | Construction method of large-section stiff support column conversion beam in narrow space |
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|---|---|
| CN107035067B (en) | 2022-06-17 |
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