CN108708498A - A kind of external prestressing strengthening concrete frame beam structure and its construction method - Google Patents
A kind of external prestressing strengthening concrete frame beam structure and its construction method Download PDFInfo
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- CN108708498A CN108708498A CN201810744717.5A CN201810744717A CN108708498A CN 108708498 A CN108708498 A CN 108708498A CN 201810744717 A CN201810744717 A CN 201810744717A CN 108708498 A CN108708498 A CN 108708498A
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- 238000005728 strengthening Methods 0.000 title claims abstract description 54
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 127
- 239000010959 steel Substances 0.000 claims abstract description 127
- 238000012546 transfer Methods 0.000 claims abstract description 42
- 238000009434 installation Methods 0.000 claims abstract description 12
- 238000000338 in vitro Methods 0.000 claims abstract description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 13
- 210000003205 muscle Anatomy 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 7
- 239000004570 mortar (masonry) Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 229920006334 epoxy coating Polymers 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims description 3
- 230000010412 perfusion Effects 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 210000002435 tendon Anatomy 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 22
- 238000009408 flooring Methods 0.000 abstract description 6
- 238000003032 molecular docking Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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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
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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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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Abstract
External prestressing strengthening concrete frame beam structure provided by the invention and its construction method, belong to construction engineering technical field, which includes at least two groups external prestressing steels, tensioning end structure, fixed end structure and transfer.Stretching end structure is located at often below the middle part beam bottom of Vierendeel girder, and every group of external prestressing steels are arranged in after being turned to by respective transfer in the tensioning end structure of span centre, and tensioning end structure carries out overlap joint and tensioning using annular two groups of external prestressing steels of anchorage pair；And often across Vierendeel girder, only a tensioning end structure is arranged in beam bottom lower section in the middle, to effectively reduce the quantity of tensioning end structure.In addition, will not only occupy the use space above flooring or roofing, but also when external prestressing installation, need not punch to floorboard or roof boarding stretching end structure setting in often across the bottom part down of Vierendeel girder；And presstressed reinforcing steel can be carried out to mend tensioning or replacement when presstressed reinforcing steel relaxes during use in vitro.
Description
Technical field
The present invention relates to construction engineering technical field more particularly to a kind of external prestressing strengthening concrete frame beam structures
And its construction method.
Background technology
Presstressed reinforcing steel is arranged in inside beams of concrete i.e. conventional prestressing force, is arranged in other than beams of concrete and answers in advance in vitro
Power.External prestressing strengthening is the method integrally reinforced to structural elements or structure using additional external prestressing steels,
Feature is to be distributed and reduce original structure stress level by applying prestressing force means change original structure internal force, eliminates general reinforcing knot
Specific stress, response lag phenomenon in structure, after enabling plus part are more preferably worked together with original structure, the overall carrying of structure
Ability is remarkably improved.
However, external prestressing strengthening technology is applied not too much more in construction projects at present, main cause has：
1) prestressing force pull end need to be arranged more than floorboard or roof boarding, and the normal use work(of building is influenced after reinforcing
Energy；
2) external prestressing steels are fold-line-shaped, and loss of prestress is larger, and external prestressing steels single span arrangement also needs both ends
It draws, stretch-draw node is more；When multispan is continuously arranged, external prestressing steels need to carry out overlap joint tensioning, and stretch-draw node construction is complicated；
3) when external prestressing steels installation positioning, floorboard or roof boarding need to punch, and influence floor where building reinforcement
Normal usage function can also destroy the water-proof system of roofing when for roof boarding；
4) when external prestressing steels relax during use, benefit tensioning can not be carried out.
Invention content
For the technological deficiency of existing external prestressing strengthening, the present invention provides a kind of external prestressing strengthening concrete frame
Often a prestressed stretch-draw end structure need to be only arranged across Vierendeel girder in structure of setting a roof beam in place and its construction method, and tensioning end structure is arranged
In Vierendeel girder bottom, not only simplifies stretching end structure node construction, reduces stretching end number of structures, and be not take up flooring
The construction area of plate, roof boarding does not influence building and uses function, when external prestressing installation, floorboard or roof boarding
It is not required to punch；Also, external prestressing steels can also multispan continuously arrange, reinforce it is efficient；In addition, when Relaxation of prestressing, also
It can carry out mending tensioning or replacing external prestressing steels etc., consolidation effect is good.
In order to solve the above technical problems, the present invention provides the following technical solutions：
A kind of external prestressing strengthening concrete frame beam structure, including at least two groups external prestressing steels, stretching end knot
Structure, fixed end structure and transfer, the stretching end structure are located at often below the middle part beam bottom of Vierendeel girder, the stretching end
Structure carries out overlap joint and tensioning using annular two groups of external prestressing steels of anchorage pair, one end of two groups of external prestressing steels respectively from
Opposite direction is arranged in tensioning end structure, the other end of two groups of external prestressing steels be anchored in respectively on fixed end structure or
It is arranged at the adjacent frame column between Vierendeel girder of person's drawing-in and after the beam vertical with Vierendeel girder positioned at neighbour across in Vierendeel girder
In tensioning end structure below portion's beam bottom, every group of external prestressing steels are turned to by respective transfer, the steering
Device is set to the Vierendeel girder bottom between tensioning end structure and fixed end structure or is set to tensioning end structure and frame column
Turn to through-hole between Vierendeel girder bottom.
Preferably, in above-mentioned external prestressing strengthening concrete frame beam structure, the external prestressing steels use
Non-bending steel cable or epoxy coating strand.
Preferably, in above-mentioned external prestressing strengthening concrete frame beam structure, the tensioning of external prestressing steels is adopted
Angle-changing extension mode, the side of the tensioning end structure is taken to be equipped with angle steering gear and stretch-draw jack successively.
Preferably, in above-mentioned external prestressing strengthening concrete frame beam structure, the annular anchorage includes one piece
It is provided with the anchor slab and the mating intermediate plate being set in taper hole that number is identical but taper hole direction is opposite, can realize two groups of phase negative sides
To external prestressing steels reeve and tensioning.
Preferably, in above-mentioned external prestressing strengthening concrete frame beam structure, in two groups of external prestressing steels
One group of external prestressing steels is arranged in the middle part of anchor slab and as the presstressed reinforcing steel of leading tensioning, and another group of external prestressing steels are worn
Set on the perimeter of anchor slab.
Preferably, in above-mentioned external prestressing strengthening concrete frame beam structure, fixing end structure is located at Vierendeel girder
Cross section the above position of natural axis.
Preferably, in above-mentioned external prestressing strengthening concrete frame beam structure, every group of external prestressing steels are divided into
Two beam presstressed reinforcing steels, two beam presstressed reinforcing steels are set to the both sides of Vierendeel girder, and one end of two beam presstressed reinforcing steels is after transfer
Converge and be arranged in tensioning end structure, the other end of two beam presstressed reinforcing steels is anchored in frame respectively after transfer turns to
The adjacent frame between Vierendeel girder of drawing-in is distinguished on the corresponding fixed end structure of beam both sides or after transfer turns to
Neighbour is arranged at column and after the beam vertical with Vierendeel girder across in the tensioning end structure of Vierendeel girder.
Preferably, in above-mentioned external prestressing strengthening concrete frame beam structure, include per beam external prestressing steels
Two external prestressing steels, four external prestressing steels for being arranged in same group in the middle part of anchor slab are distributed in the vertex of a square
On, four external prestressing steels for being arranged in another group of the perimeter of anchor slab are distributed on a rectangular vertex, and institute
It is parallel with the rectangular center coincidence and sideline to state square, square is located at rectangular inside.
Preferably, described adjacent between Vierendeel girder in above-mentioned external prestressing strengthening concrete frame beam structure
Frame column at and the beam vertical with Vierendeel girder on open up cross through hole, and casing is set in through-hole, the both ends of described sleeve pipe
Face and the two sides of the beam vertical with Vierendeel girder flush, and steering block, the steering block is respectively set in the both ends of described sleeve pipe
It is individually fixed on the adjacent frame column between Vierendeel girder, there are one the sleeve through hole penetrated through, the steerings for described sleeve pipe tool
Block has the steering block through-hole of a perforation, the bottom of the steering block through-hole gradual by being laterally away from casing side direction close to casing
It reduces, described sleeve pipe through-hole combines to form steering through-hole with two steering block through-holes.
The invention also discloses a kind of construction method of external prestressing strengthening concrete frame beam structure as described above,
Include the following steps：
Step 1 carries out external prestressing strengthening design to Vierendeel girder, determines external prestressing according to known loading condition
The dosage of muscle；
Step 2, external prestressing steels blanking and fixed end structure and transfer processing and fabricating；
The location and installation of step 3, fixing end component and transfer：It will be first used between fixed end structure and Vierendeel girder
Surface between the surface and transfer and Vierendeel girder of docking for docking is polished and is removed totally, and structure gluing is then used
It ties and fixed end structure and transfer is individually fixed on Vierendeel girder with anchor bolt, between fixing end steel member and Vierendeel girder
Gap epoxy resin mortar or non-shrink mortar perfusion are closely knit；
Step 4, external prestressing steels lashing and installation；
Step 5, stretching end annular anchorage installation and tension of prestressed tendon, external prestressing steels use angle-changing extension technique
Tensioning, tensioning using based on stretching force control, the method that stretch value is checked, the deviation for surveying stretch value and calculated extension value do not answer
More than ± 6%, only one group of external prestressing steels of tensioning when construction, as stretching force and external prestressing steels extend in stretching process
Amount continues to increase, and annular anchorage is gradually to the reverse movement of stretching force, in a disguised form drive of another group of external prestressing steels
It draws, when the stretching force of the different directions of two groups of external prestressing steels all reaches design value, annular anchorage stress reaches balance not
It moves, is anchored again, tensioning terminates；
Step 6, after the completion of external prestressing steels tensioning, to external prestressing steels, tensioning end structure, fixed end structure and
Transfer carries out protective treatment.
By techniques disclosed above scheme it is found that compared with prior art, beneficial effects of the present invention are as follows：
External prestressing strengthening concrete frame beam structure provided by the invention and its construction method, on the one hand, often across frame
Setting a roof beam in place only, a tensioning end structure is arranged in beam bottom lower section in the middle, and the tensioning end structure is external using annular two groups of anchorage pair
Presstressed reinforcing steel carries out overlap joint and tensioning, to effectively reduce the quantity of tensioning end structure, and simplifies tensioning end structure
Construction.On the other hand, the present invention by stretching end structure setting in across the bottom part down of Vierendeel girder, will not often occupy floorboard or
Use space above roof boarding does not influence building and uses function, and need not be carried out to floorboard or roof boarding when construction
It punches, avoids impacting the water-proof system using function and flooring or roofing of building.In another aspect, the present invention will open
Pull end structure setting, across the bottom part down of Vierendeel girder, will not occupy floorboard or roof boarding space above, therefore body in often
External prestressed muscle can reserve the working length needed for tensioning, thus when presstressed reinforcing steel relaxes during use, it can be to answering in advance
Power muscle is carried out mending tensioning or be replaced.Also, external prestressing steels can also multispan continuously arrange, reinforce it is efficient.
Description of the drawings
Fig. 1 is one embodiment of the invention single span Vierendeel girder external prestressing strengthening floor plan.
Fig. 2 is one embodiment of the invention single span Vierendeel girder external prestressing strengthening elevation.
Fig. 3 is the 1-1 sectional views of Fig. 1.
Fig. 4 is the structural schematic diagram of the fixation end structure of one embodiment of the invention.
Fig. 5 is that one embodiment of the invention two bridgees across the above Vierendeel girder external prestressing strengthening floor plan.
Fig. 6 is that one embodiment of the invention two bridgees across the above Vierendeel girder external prestressing strengthening elevation.
In figure：1- external prestressing steels, 2- tensioning end structure, 21- anchor slabs, 3- fix end structure, 31- bearing plates, 32- and squeeze
Press anchor, 33- fixing ends steel member, 34- oblique support plates, 4- transfers, 5- Vierendeel girders, 6- frame columns, 7- casings, 71- casings
Beam through-hole, 8- steering blocks, 81- steering blocks through-hole, the steering gear of 9- angles, 10- stretch-draw jacks, 11- vertical with Vierendeel girder.
Specific implementation mode
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.According to following explanation and right
Claim, advantages and features of the invention will become apparent from.To this hair be described in detail by cited embodiment combination attached drawing below
Bright technology contents and feature.Need in addition it illustrate, attached drawing is all made of very simplified form and uses non-accurate ratio
Example, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.For sake of convenience, "upper" described below,
"lower" is consistent with the upper and lower direction of attached drawing, but this can't be the limitation of technical solution of the present invention.
It please refers to Fig.1 to Fig. 6, present embodiment discloses a kind of external prestressing strengthening concrete frame beam structures, including
At least two groups external prestressing steels 1, tensioning end structure 2, fixed end structure 3 and transfer 4, the tensioning end structure 2 are located at
Often below the middle part beam bottom of Vierendeel girder 5, the tensioning end structure 2 is carried out using annular two groups of external prestressing steels 1 of anchorage pair
Overlap joint and tensioning, one end of two groups of external prestressing steels 1 are arranged in from opposite direction in tensioning end structure 2 respectively, two groups of bodies
The other end of External prestressed muscle 1 be anchored in respectively on fixed end structure 3 or the adjacent frame column between Vierendeel girder 5 of drawing-in at
And it is arranged in after the beam 11 vertical with Vierendeel girder in the adjacent tensioning end structure 2 below the middle part beam bottom of Vierendeel girder 5, every group
External prestressing steels 1 are turned to by respective transfer 4, and the transfer 4 is set to tensioning end structure 2 and fixes
5 bottom of Vierendeel girder between end structure 3 or the Vierendeel girder 5 turned between through-hole for being set to tensioning end structure 2 and frame column 6
Bottom.
On the one hand, middle presstressed reinforcing steel single span arrangement also needs both ends tensioning, stretch-draw node more compared with prior art；Multispan connects
When continuous arrangement, presstressed reinforcing steel needs to carry out overlap joint tensioning, and stretch-draw node construction is complicated；The external prestressing strengthening of the present embodiment is mixed
Solidifying soil frame beam structure, often across Vierendeel girder 5, only a tensioning end structure 2, the tensioning end structure 2 is arranged in beam bottom lower section in the middle
Overlap joint and tensioning are carried out using two groups of external prestressing steels 1 of annular anchorage pair, to effectively reduce the number of tensioning end structure 2
Amount, and simplify the construction of tensioning end structure 2.
On the other hand, middle external prestressing stretching end need to be arranged more than floorboard or roof boarding compared with prior art, and
When presstressed reinforcing steel installs positioning, floorboard or roof boarding need to punch, and floor building uses function where influencing reinforcement, and works as and be
When roof boarding, the water-proof system of roofing can be also destroyed；The external prestressing strengthening concrete frame beam structure of the present embodiment will be opened
Pull end structure 2 is set to often across the bottom part down of Vierendeel girder 5, will not occupy floorboard or roof boarding space above, not shadow
Ring building and use function, and need not punch to floor or roof boarding, avoid use function to building and flooring or
The water-proof system of person's roofing impacts.
In another aspect, since prestressed stretch-draw needs reserved certain tension operation length, conventional method tensioning end structure 2
It is prominent not allow to reserve more than flooring, otherwise occupy more floor space, therefore presstressed reinforcing steel is during use in the prior art
When relaxation, benefit tensioning can not be carried out；The external prestressing strengthening concrete frame beam structure of the present embodiment, by tensioning end structure 2
It is set to often across the bottom part down of Vierendeel girder 5, floorboard or roof boarding space above will not be occupied, therefore presstressed reinforcing steel can
To reserve the working length needed for tensioning, opened to when presstressed reinforcing steel relaxes during use, carry out mending to presstressed reinforcing steel
It draws or is replaced.
It for single span Vierendeel girder external prestressing strengthening, please refers to Fig.1 to Fig. 2, the tensioning end structure 2 is using annular anchor
Tool carries out overlap joint to two groups of external prestressing steels 1 and tensioning, one end of two groups of external prestressing steels 1 are worn from opposite direction respectively
In tensioning end structure 2, the other end of two groups of external prestressing steels 1 is anchored in respectively on fixed end structure 3, and every group pre- in vitro
Stress rib 1 is turned to by respective transfer 4, and the transfer 4 is set to tensioning end structure 2 and fixed end structure
Between 3.
The above Vierendeel girder external prestressing strengthening is bridgeed across for two, please refers to Fig. 5 to Fig. 6, the tensioning end structure 2 uses
Two groups of external prestressing steels 1 of annular anchorage pair carry out overlap joint and tensioning, and one end of two groups of external prestressing steels 1 is respectively from opposite
Direction is arranged in tensioning end structure 2, the other end of two groups of external prestressing steels 1 be anchored in respectively on fixed end structure 3 or
It is arranged in positioned at adjacent across Vierendeel girder 5 at the adjacent frame column between Vierendeel girder 5 of drawing-in and after the beam 11 vertical with Vierendeel girder
Middle part beam bottom below tensioning end structure 2 in, every group of external prestressing steels 1 are turned to by respective transfer 4, institute
State 5 bottom of Vierendeel girder or be set to stretching end knot that transfer 4 is set between tensioning end structure 2 and fixed end structure 3
5 bottom of Vierendeel girder of structure 2 and frame column 6 turned between through-hole.
Preferably, in above-mentioned external prestressing strengthening concrete frame beam structure, the transfer 4 is to be fixed on
The semicylinder of 5 bottom of Vierendeel girder.By the way that the transfer 4 of structure as above is arranged, ensure smooth turn here of body presstressed reinforcing steel 1
To, make external prestressing steels 1 formed it is advantageous to structure linear.
Influence is blocked by another group of presstressed reinforcing steel due to carrying out tensioning to one group of presstressed reinforcing steel, tensioning thousand can not be installed
Jin jacking row tensioning, therefore, in the present embodiment, angle-changing extension mode, the stretching end are taken in the tensioning of external prestressing steels 1
The side of structure 2 is equipped with angle steering gear 9 and stretch-draw jack 10 successively, will be answered in advance in vitro by the way that angle steering gear 9 is arranged
Power muscle 1 carries out tensioning after drawing.
Preferably, in above-mentioned external prestressing strengthening concrete frame beam structure, the annular anchorage includes one piece
Be provided with the anchor slab 21 and the mating intermediate plate being set in taper hole that number is identical but taper hole direction is opposite, can realize two groups it is opposite
The external prestressing steels 1 in direction reeve and tensioning.One group of external prestressing steels only in tensioning end structure 2 described in tensioning when construction
1, continuing to increase with stretching force and this group of 1 elongation of external prestressing steels in stretching process, annular anchorage is gradually to tensioning
The reverse movement of power, in a disguised form drive the tensioning of another group of external prestressing steels 1 to be carried out to another group of external prestressing steels 1
Tensioning, when stretching force reaches design value and acts on that two groups of 1 pulling force of opposite direction presstressed reinforcing steel are equal on annular anchorage, annular
Anchorage stress reaches balance and no longer moves, and is anchored, tensioning terminates.
In order to enable external prestressing stepless action is on Vierendeel girder 5, it is preferred that mixed in above-mentioned external prestressing strengthening
In solidifying soil frame beam structure, every group of external prestressing steels 1 are divided into two beam presstressed reinforcing steels, and two beam presstressed reinforcing steels are set to Vierendeel girder 5
Both sides, fixed end structure 3 is symmetrically disposed on the two sides of Vierendeel girder 5, and the steering through-hole on frame column 6 is symmetrically disposed on frame
Set a roof beam in place 5 both sides, one end of two beam presstressed reinforcing steels converges after transfer 4 and is arranged in tensioning end structure 2, and two beams are pre-
The other end of stress rib be anchored in respectively after the steering of transfer 4 on the corresponding fixed end structure 3 of 5 both sides of Vierendeel girder or
Distinguish at the adjacent frame column between Vierendeel girder 5 of drawing-in and after the beam 11 vertical with Vierendeel girder after the steering of transfer 4
Neighbour is arranged in across in the tensioning end structure 2 of Vierendeel girder 5.
Preferably, in above-mentioned external prestressing strengthening concrete frame beam structure, in two groups of external prestressing steels 1
One group of external prestressing steels 1 is arranged in the middle part of anchor slab 21 and as the presstressed reinforcing steel of leading tensioning, another group of external prestressing
Muscle 1 is arranged in the perimeter of anchor slab 21.The external prestressing steels 2 of leading tensioning are set to the middle part of anchor slab 21, can be incited somebody to action
The external prestressing steels 1 of tensioning are put together as far as possible, so that the structure of angle steering gear 9 and stretch-draw jack 10 is more
Step up to gather.Specifically, in the external prestressing strengthening concrete frame beam structure of embodiment, wrapped per beam external prestressing steels 1
Two external prestressing steels 1 are included, same group of four external prestressing steels 1 for being arranged in 21 middle part of anchor slab are distributed in a square
Vertex on, four external prestressing steels 1 for being arranged in another group of the perimeter of anchor slab 21 are distributed in a rectangular top
On point, and the square is overlapped with the rectangular center and sideline is parallel, and square is located at rectangular inside.
Preferably, in above-mentioned external prestressing strengthening concrete frame beam structure, fixed end structure 3 is located at Vierendeel girder
The above position of natural axis of 5 cross section, to improve the stressed effect of external prestressing steels 1.
Preferably, in above-mentioned external prestressing strengthening concrete frame beam structure, the fixed end structure includes holding
Pressing plate 31, extruding anchor 32 and oblique support plate 34, the bearing plate 31 is fixed by fixing end steel member 33 and Vierendeel girder 5 to be connected
It connects, lower end and the fixing end steel member 33 of the oblique support plate 34 weld, and upper end is welded with bearing plate 31, the external prestressing
Muscle 1 is anchored in extruding anchor 32 after drawing-in oblique support plate 34 and bearing plate 31 successively, and extruding anchor 32 is by being sheathed on prestressing force
The sleeve of muscle end is squeezed by dedicated extruded equipment so that presstressed reinforcing steel of holding with a firm grip after sleeve generation is plastically deformed is squeezed, it is described
The through-hole in same level height passed through for external prestressing steels 1 is opened up respectively on oblique support plate 34 and the bearing plate.
The stability of bearing plate can be not only improved by the way that oblique support plate 34 is arranged, and external prestressing steels 1 can be made to anchor into
It is in horizontality before extruding anchor, improves anchoring effect.
Preferably, in above-mentioned external prestressing strengthening concrete frame beam structure, external prestressing steels 1 are using without viscous
Tie steel strand wires or epoxy coating strand.
Preferably, described adjacent between Vierendeel girder 5 in above-mentioned external prestressing strengthening concrete frame beam structure
Frame column 6 at and the beam 11 vertical with Vierendeel girder on open up cross through hole, and sleeve 7 is set in cross through hole, it is described
The two sides of the both ends of the surface of casing 7 and the beam 11 vertical with Vierendeel girder flush, and steering is respectively set in the both ends of described sleeve pipe 7
Block 8, the steering block 8 are individually fixed on the adjacent frame column 6 between Vierendeel girder 5, and there are one perforations for the tool of described sleeve pipe 7
Sleeve through hole 71, the steering block 8 have the steering block through-hole 81 of a perforation, and the bottom of the steering block through-hole 81 is by close to set
Pipe 7 is laterally away from 7 side direction of casing and continuously decreases, and described sleeve pipe through-hole 71 combines to form the steering with two steering block through-holes 81
Through-hole.
Please continue to refer to Fig. 1 to Fig. 6, the invention also discloses a kind of external prestressing strengthening concrete frames as described above
The construction method for structure of setting a roof beam in place, includes the following steps：
Step 1 carries out external prestressing strengthening design, determination is answered in advance in vitro according to known loading condition to Vierendeel girder 5
The dosage of power muscle 1；
Step 2,1 blanking of external prestressing steels and fixed end structure 3 and 4 processing and fabricating of transfer；
The location and installation of step 3, fixed end structure 3 and transfer 4：It first will be between fixed end structure 3 and Vierendeel girder 5
It polishes and is removed totally for the surface for docking between the surface and transfer 4 and Vierendeel girder 5 of docking, then with knot
Fixed end structure 3 and transfer 4 are simultaneously individually fixed on Vierendeel girder 5 with anchor bolt by structure gluing knot, fixing end steel member 33 with
Gap epoxy resin mortar or non-shrink mortar perfusion between Vierendeel girder 5 is closely knit；
Step 4,1 lashing of external prestressing steels are divided into two beam presstressed reinforcing steels, two beams with installation, every group of external prestressing steels 1
Presstressed reinforcing steel is set to the both sides of Vierendeel girder 5, and one end of two beam presstressed reinforcing steels is converged and is arranged in after the steering of transfer 4
In tensioning end structure 2, the other end of two beam presstressed reinforcing steels is anchored in 5 both sides of Vierendeel girder respectively after the steering of transfer 4
On corresponding fixed end structure 3 or after the steering of transfer 4 respectively at the adjacent frame column between Vierendeel girder 5 of drawing-in and
Neighbour is arranged in after the beam 11 vertical with Vierendeel girder across in the tensioning end structure 2 of Vierendeel girder 5；
Step 5, stretching end annular anchorage installation and tension of prestressed tendon, external prestressing steels 1 use angle-changing extension technique
Tensioning, tensioning using based on stretching force control, the method that stretch value is checked, the deviation for surveying stretch value and calculated extension value do not answer
More than ± 6%, only one group of external prestressing steels 1 of tensioning when construction, as stretching force and external prestressing steels 1 are stretched in stretching process
Long amount continues to increase, and annular anchorage is gradually to the reverse movement of stretching force, in a disguised form drive another group of external prestressing steels 1
Tensioning, when the stretching force of the different directions of two groups of external prestressing steels 1 all reaches design value, annular anchorage stress reaches balance
It no longer moves, is anchored, tensioning terminates；
Step 6, after the completion of 1 tensioning of external prestressing steels, to external prestressing steels 1, tensioning end structure 2, fixed end structure
3 and transfer 4 carry out protective treatment, it is ensured that the normal use performance and durability of external prestressing strengthening system.
In conclusion external prestressing strengthening concrete frame beam structure provided by the invention and its construction method, often across
Only a tensioning end structure 2 is arranged in its middle part beam bottom lower section to Vierendeel girder 5, and the tensioning end structure 2 is using annular two groups of anchorage pair
External prestressing steels 1 carry out overlap joint and tensioning, to effectively reduce the quantity of tensioning end structure 2, and simplify stretching end
The construction of structure 2.In addition, tensioning end structure 2 is set to often across the bottom part down of Vierendeel girder 5 by the present invention, flooring will not be occupied
Plate or roof boarding space above do not influence building and use function, and need not punch to floorboard or roof boarding,
It avoids impacting the water-proof system using function and floorboard or roofing of building.Furthermore the present invention is by stretching end knot
Structure 2 is set to often across the bottom part down of Vierendeel girder 5, will not occupy floorboard or roof boarding space above, therefore external pre-
Stress rib can reserve the working length needed for tensioning, thus when presstressed reinforcing steel relaxes during use, it can be to presstressed reinforcing steel
It carries out mending tensioning or be replaced.In addition, external prestressing steels can also multispan continuously arrange, reinforce it is efficient.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (10)
1. a kind of external prestressing strengthening concrete frame beam structure, which is characterized in that including at least two groups external prestressing steels,
Tensioning end structure, fixed end structure and transfer, the stretching end structure are located at often below the middle part beam bottom of Vierendeel girder, institute
It states tensioning end structure and carries out overlap joint and tensioning using annular two groups of external prestressing steels of anchorage pair, the one of two groups of external prestressing steels
End is arranged in from opposite direction in tensioning end structure respectively, and the other end of two groups of external prestressing steels is anchored in fixing end respectively
It is arranged in structure or at the adjacent frame column between Vierendeel girder of drawing-in and after the beam vertical with Vierendeel girder positioned at neighbour across frame
In the tensioning end structure below the beam bottom of middle part set a roof beam in place, every group of external prestressing steels are turned to by respective transfer,
The transfer is set to the Vierendeel girder bottom between tensioning end structure and fixed end structure or is set to tensioning end structure
With the Vierendeel girder bottom of frame column turned between through-hole.
2. external prestressing strengthening concrete frame beam structure as described in claim 1, which is characterized in that described to answer in advance in vitro
Power muscle uses non-bending steel cable or epoxy coating strand.
3. external prestressing strengthening concrete frame beam structure as described in claim 1, which is characterized in that external prestressing steels
Tensioning take angle-changing extension mode, the side of the tensioning end structure is equipped with angle steering gear and stretch-draw jack successively.
4. external prestressing strengthening concrete frame beam structure as described in claim 1, which is characterized in that the annular anchorage
It is provided with the anchor slab and the mating intermediate plate being set in taper hole that number is identical but taper hole direction is opposite including one piece, can realize two
Group opposite direction external prestressing steels reeve and tensioning.
5. external prestressing strengthening concrete frame beam structure as described in claim 1, which is characterized in that two groups are answered in advance in vitro
One group of external prestressing steels in power muscle are arranged in the middle part of anchor slab and as the presstressed reinforcing steels of leading tensioning, and another group pre- in vitro
Stress rib is arranged in the perimeter of anchor slab.
6. external prestressing strengthening concrete frame beam structure as described in claim 1, which is characterized in that fixing end structure bit
The above position of natural axis in the cross section of Vierendeel girder.
7. external prestressing strengthening concrete frame beam structure as described in claim 1, which is characterized in that every group is answered in advance in vitro
Power muscle is divided into two beam presstressed reinforcing steels, and two beam presstressed reinforcing steels are set to the both sides of Vierendeel girder, and one end of two beam presstressed reinforcing steels is by turning
Converge after to device and be arranged in tensioning end structure, the other end of two beam presstressed reinforcing steels distinguishes anchor after transfer turns to
Be fixed on the corresponding fixed end structure of Vierendeel girder both sides or distinguish after transfer turns to drawing-in it is adjacent across Vierendeel girder it
Between frame column at and the beam vertical with Vierendeel girder after be arranged in neighbour across in the tensioning end structure of Vierendeel girder.
8. external prestressing strengthening concrete frame beam structure as claimed in claim 7, which is characterized in that answered in advance in vitro per beam
Power muscle includes two external prestressing steels, and four external prestressing steels for being arranged in same group in the middle part of anchor slab are distributed in a pros
On the vertex of shape, four external prestressing steels for being arranged in another group of the perimeter of anchor slab are distributed in a rectangular vertex
On, and the square is overlapped with the rectangular center and sideline is parallel, square is located at rectangular inside.
9. external prestressing strengthening concrete frame beam structure as described in claim 1, which is characterized in that described adjacent across frame
Cross through hole is opened up at frame column between setting a roof beam in place and on the beam vertical with Vierendeel girder, and casing is set in through-hole, the set
The two sides of the both ends of the surface of pipe and the beam vertical with Vierendeel girder flush, and steering block is respectively set in the both ends of described sleeve pipe, institute
It states steering block to be individually fixed on the adjacent frame column between Vierendeel girder, the sleeve through hole that there are one described sleeve pipe tools penetrates through,
The steering block has the steering block through-hole of a perforation, and the bottom of the steering block through-hole close to casing by being laterally away from casing side
Direction continuously decreases, and described sleeve pipe through-hole combines to form steering through-hole with two steering block through-holes.
10. a kind of construction of external prestressing strengthening concrete frame beam structure as described in any one of claim 1-9
Method, which is characterized in that include the following steps：
Step 1 carries out external prestressing strengthening design to Vierendeel girder, determines external prestressing steels according to known loading condition
Dosage；
Step 2, external prestressing steels blanking and fixed end structure and transfer processing and fabricating；
The location and installation of step 3, fixing end component and transfer：First it will be used to dock between fixed end structure and Vierendeel girder
Surface and transfer and Vierendeel girder between polish and is removed totally for surface dock, then simultaneously with structure gluing knot
Fixed end structure and transfer are individually fixed on Vierendeel girder with anchor bolt, the gap between fixing end steel member and Vierendeel girder
It is closely knit with epoxy resin mortar or non-shrink mortar perfusion；
Step 4, external prestressing steels lashing and installation；
Step 5, stretching end annular anchorage installation and tension of prestressed tendon, external prestressing steels use angle-changing extension technique tensioning,
Tensioning using based on stretching force control, the method that stretch value is checked, the deviation for surveying stretch value and calculated extension value is not to be exceeded
± 6%, only one group of external prestressing steels of tensioning when construction, in stretching process not with stretching force and external prestressing steels elongation
Disconnected to increase, annular anchorage is gradually to the reverse movement of stretching force, in a disguised form drive the tensioning of another group of external prestressing steels, when
When the stretching force of the different directions of two groups of external prestressing steels all reaches design value, annular anchorage stress reaches balance and no longer moves
It is dynamic, it is anchored, tensioning terminates；
Step 6, after the completion of external prestressing steels tensioning, to external prestressing steels, tensioning end structure, fixed end structure and steering
Device carries out protective treatment.
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|---|---|---|---|---|
| CN109537929A (en) * | 2018-11-30 | 2019-03-29 | 北京市建筑工程研究院有限责任公司 | Demolishing columns bracing means and reinforcement means |
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| CN110331868A (en) * | 2019-07-16 | 2019-10-15 | 南通市规划设计院有限公司 | One kind going support cylinder External prestressed ruggedized construction and construction method |
| CN110512890A (en) * | 2019-08-07 | 2019-11-29 | 湖南工程学院 | A kind of method that side elevation external prestressing promotes reinforced concrete load bearing beam power |
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| CN114562070A (en) * | 2022-03-19 | 2022-05-31 | 池州建投鼎晟预制构件有限公司 | Anti bearing capacity structure of prestressed concrete roof beam |
| WO2023159811A1 (en) * | 2022-02-28 | 2023-08-31 | 长沙理工大学 | Device for applying external prestress on basis of on-site release, and bridge reinforcement method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775903A (en) * | 2010-01-22 | 2010-07-14 | 北京首钢建设集团有限公司 | Construction method for pouring after settlement of reinforced concrete continuous beam with cohesive pre-stress |
| CN208586817U (en) * | 2018-07-09 | 2019-03-08 | 上海建工集团股份有限公司 | A kind of external prestressing strengthening concrete frame beam structure |
-
2018
- 2018-07-09 CN CN201810744717.5A patent/CN108708498B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775903A (en) * | 2010-01-22 | 2010-07-14 | 北京首钢建设集团有限公司 | Construction method for pouring after settlement of reinforced concrete continuous beam with cohesive pre-stress |
| CN208586817U (en) * | 2018-07-09 | 2019-03-08 | 上海建工集团股份有限公司 | A kind of external prestressing strengthening concrete frame beam structure |
Non-Patent Citations (3)
| Title |
|---|
| 熊学玉等: "体外预应力结构设计研究", 工业建筑 * |
| 邓宁等: "体外预应力加固实例分析", 《建筑技术》 * |
| 郝伟;: "体外预应力技术在结构加固工程中的应用", 工程质量 * |
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| CN110512890A (en) * | 2019-08-07 | 2019-11-29 | 湖南工程学院 | A kind of method that side elevation external prestressing promotes reinforced concrete load bearing beam power |
| CN111424524A (en) * | 2019-09-05 | 2020-07-17 | 湖南工业大学 | Modular ultrahigh-performance concrete prefabricated assembled beam suitable for different spans |
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