CN108894123A - A kind of quick Shear Strengthening box-beam structure of Prestressed U type muscle and method - Google Patents
A kind of quick Shear Strengthening box-beam structure of Prestressed U type muscle and method Download PDFInfo
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- CN108894123A CN108894123A CN201811048002.2A CN201811048002A CN108894123A CN 108894123 A CN108894123 A CN 108894123A CN 201811048002 A CN201811048002 A CN 201811048002A CN 108894123 A CN108894123 A CN 108894123A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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Abstract
A kind of quick Shear Strengthening box-beam structure of Prestressed U type muscle, by angle-style anchor (1), anchor ring (2), U-shaped muscle (3), grid muscle (4), concrete box girder (5), crack resist at mortar layer (6) collectively constitutes, U-shaped muscle (3) is in U-shape arranged for interval perpendicular to concrete box girder (5) axial direction along the side and bottom surface of concrete box girder (5), U-shaped muscle (3) both ends pass through angle-style anchor (1), anchor ring (2) is fixed on two side surface upper parts of concrete box girder (5), grid muscle (4) is hung on the outer surface of concrete box girder (5) side and bottom surface, crack resist at mortar layer (6) passes through injection, the mode smeared or poured covers U-shaped muscle (3) and grid muscle (4), and it is combined into one with concrete box girder (5).It in structure of the invention, is constructed by U-shaped muscle, reduces loss of prestress, reduce the size of anchorage, reduced anchoring space, make concrete box girder consolidation effect continuous and effective.
Description
Technical field
The present invention relates to a kind of reinforcement bridge structure, especially a kind of quick Shear Strengthening box-beam structure of Prestressed U type muscle
And method, belong to field of civil engineering.
Background technique
In Bridges in Our Country construction, prestressed concrete box-beam bridge is built in Daxing.Since box section torsional rigidity is big, surely
It is qualitative good, the requirement of Modern Construction method is adapted to, so being widely used.But since design section is excessively thin, applies
Work mass defect, bridge overload the reason of serious etc., cause existing concrete box beam to generate a large amount of diseases, lead to bridge
The decline of load bearing beam power, influences the security performance of bridge.Therefore how conveniently and efficiently to reinforce existing box girder bridge also just becomes one
A urgent problem to be solved.
For the Shear Strengthening technology of existing box girder bridge, mainly there is increasing section method for strengthening, steel bonding steel plate reinforcement method, pastes
Fibrous composite method for strengthening etc..Increasing section method for strengthening mainly increases concrete size in component surface, increases stress steel
Muscle makes it form entirety with original structure, to increase component effective height and steel bar stress area, improves element bearing capacity,
It improves bearing capacity and rigidity is largely effective, but lack initiative, existing crack, the development impact in inhibition crack is not good enough to reducing.
Affixing steel plate reinforcement method be mainly use epoxy resin series binder by steel sticking reinforced concrete structure tight side
Edge or weak part are allowed to form whole common stress with original structure, and speed of application is fast, but for the high temperature item more than 60 DEG C
Under part, bonding gum softening easily occurs and loses bearing capacity, and equally lack initiative, to the existing crack of reduction, inhibits crack
Development impact is not good enough.Paste fibrous composite method for strengthening mainly and will paste fibrous composite be pasted into adhesive glue it is to be added
Gu the surface of concrete structure makes fibrous composite, resin glue, armored concrete organically be combined into a complete structure,
Its construction is very convenient, but its stripping damage that early stage easily occurs, due to the lesser bending resistance the moment of inertia in its reinforcement material section, just
It is poor to spend improvement effect, also lacks initiative, existing crack, the development impact in inhibition crack is not equally good enough to reducing.
Still lack effective prestressed consolidation technology for the Shear Strengthening of existing box girder bridge, usually it is combined anti-bend reinforced
External prestressing technique, by the presstressed reinforcing steel of Vertical Curve shape or fold-line-shaped arrange, portion is reached while anti-bend reinforced
Divide the purpose of Shear Strengthening, however there is the deficiency to the specific aim difference of shearing resistance demand in it, conventional simply reinforce in beam side is applied
Add vertical prestressing, presstressed reinforcing steel length is small, loss of prestress is big, and anchoring space is big, complicated for operation.And the present invention proposes one
The quick Shear Strengthening box-beam structure of kind Prestressed U type muscle and method, are constructed by U-shaped muscle, increase presstressed reinforcing steel length, are reduced pre-
Stress loss, and propose convenient stretch-draw anchor measure.
Summary of the invention
The object of the present invention is to provide a kind of quick Shear Strengthening box-beam structure of Prestressed U type muscle and methods, solve coagulation
Initiative in the presence of native box beam reinforcing process is poor, and presstressed reinforcing steel length is small, loss of prestress is big, complicated for operation, and tensioning is difficult
The technical problems such as degree is big, and anchoring space is big.The present invention, which has, constructs simple and effective, flexible design, easy to process, anchorage reliability
Well, the advantages that initiative is strong.
The technical scheme is that：A kind of quick Shear Strengthening box-beam structure of Prestressed U type muscle is anchored by angle-style and is filled
Set, anchor ring, U-shaped muscle, grid muscle, concrete box girder, crack resist at mortar layer collectively constitute, U-shaped muscle perpendicular to concrete box girder axial direction
Direction is in U-shape arranged for interval along the side and bottom surface of concrete box girder, arranges 0.3~1.5m of spacing, U-shaped muscle both ends pass through angle
Type anchor, anchor ring are fixed on two side surface upper parts of concrete box girder, lead between angle-style anchor and concrete box girder
It crosses anchor bolt and structure glue is fixed on concrete box beam sides, U-shaped muscle passes through the reserved slot of angle-style anchor, and U-shaped muscle passes through
The outside of the reserved slot of angle-style anchor is fixed at anchor ring application prestressing force and both ends, passes through spiral shell between anchor ring and U-shaped muscle
Line is fixedly connected, and grid muscle is hung on the outer surface of concrete box beam sides and bottom surface, and the bundle item and U-shaped muscle for passing through dispersed placement
Binding connection, crack resist at mortar layer injection, smear or cover by way of pouring U-shaped muscle and grid muscle, and and concrete box girder
It is combined into one.
The grid muscle be one of steel wire, web, wire rope net, diameter≤8mm, grid spacing≤
300mm。
The side of the concrete box girder and bottom surface intersection corner angle carry out radiused processing, radiused radius >=25mm.
The U-shaped muscle is continuous U-shaped metal ribs, and both ends are provided with external screw thread matched with anchor ring.
The U-shaped muscle applies prestressing force and is realized by tightening anchor ring, and anchor ring is tightened circle number and determined by prestressed size.
The one kind of the crack resist at mortar layer mixed with steel fibre, polypropylene fibre, glass fibre, carbon fiber and plant fiber
Or it is several.
A kind of quick Shear Strengthening box-beam structure method of Prestressed U type muscle, it is U-shaped by fixed angle type anchor, installation
Muscle applies prestressing force, and repetition installs U-shaped muscle and applies prestressing force, installs grid muscle and crack resist at mortar layer is arranged, realize to box beam
The quick Shear Strengthening of structure：
A. it is surface-treated：Concrete box girder concrete surface is handled, its surface concrete dabbing is sufficiently removed
The spots such as weak floor, cement laitance coating and the grease of original concrete surface, until exposing solid surface, to the side of concrete box girder
Face and bottom surface intersection corner angle carry out radiused processing；
B. fixed angle type anchor：Angle-style anchor is fixed on concrete box girder side by anchor bolt and structure glue
Face；
C., U-shaped muscle is installed：The both ends of each single u-shaped muscle are successively passed through to the reserved slot of angle-style anchor.
D. apply prestressing force：After the installation in place of U-shaped muscle, it is screwed to certain circle number by anchor ring, carrys out the U-shaped muscle of tensioning；
E. it repeats that U-shaped muscle is installed and applies prestressing force：Repeat step C~D.
F., grid muscle is installed：The laying of grid muscle is carried out by the size of design requirement, at least one layer of grid muscle is coated on mixed
The surface of solidifying soil box beam, grid muscle are connected by the bundle item of dispersed placement and the binding of U-shaped muscle.
G., crack resist at mortar layer is set：Crack resist at mortar layer injection, smear or cover by way of pouring U-shaped muscle and grid
Muscle, and be combined into one with concrete box girder.
H. maintenance protection：Wet curing is carried out to crack resist at mortar layer, the end and anchor ring of U-shaped muscle are protected.
In structure of the invention, U-shaped muscle is continuous U-shaped metal ribs, is constructed by U-shaped muscle, and presstressed reinforcing steel is in circumferential direction
Three directions are continuous, increase presstressed reinforcing steel length, reduce loss of prestress；U-shaped muscle directly provides the function of shearing resistance for box beam；
U-shaped muscle applies prestressing force by anchor ring, reduces the size of anchorage to the greatest extent；It is symmetrically set in the angle of concrete box girder two sides
Type anchor provides the counterforce device of tension of prestressed tendon, reduces anchoring space；Anchor ring tightens circle number by prestressed
Size determines, to determine that prestressed size provides maximum convenience；Grid muscle and crack resist at mortar layer collective effect provide
Crack resistance and stability, and then make concrete box girder consolidation effect continuous and effective.
Relative to existing concrete box beam reinforcement technique, the invention has the advantages that：
(1) it is constructed by U-shaped muscle, increases presstressed reinforcing steel length, reduce prestressing force caused by tension of prestressed tendon anchors
Loss, U-shaped muscle directly provide the function of shearing resistance for box beam.
(2) angle-style anchor provides the counterforce device of tension of prestressed tendon, and the combination of anchor ring, farthest
Reduce anchoring space.
(3) grid muscle and crack resist at mortar layer collective effect effectively improve the problem of reinforcing layer cracks, and ensure that reinforcing knot
The long-term behaviour of structure.
(4) U-shaped muscle machine-shaping speed is fast, while meeting the reinforcing demand of box beam two sides, and two sides shearing resistance muscle is continuous
Change, improve the globality of shearing resistance muscle, improve its anchoring effect, various sizes of box beam can be met and reinforce demand.
(5) U-shaped muscle is applied with prestressing force, is a kind of active reinforcement technique, can effectively reduce the existing crack of structure, inhibition
The development in crack.
(6) relative to traditional passive type reinforcement technique, construction cost increases seldom, influences small, appearance after reinforcing to structure
Change small.
A kind of quick Shear Strengthening box-beam structure of Prestressed U type muscle proposed by the present invention and method, have that initiative is strong, applies
The feature that work speed is fast, effect is good, at low cost can be widely applied to the Shear Strengthening of concrete box girder.
Detailed description of the invention
The following drawings are only intended to schematically illustrate and explain the present invention, not delimit the scope of the invention.
Fig. 1 is a kind of quick Shear Strengthening box-beam structure stereoscopic schematic diagram of Prestressed U type muscle.
Fig. 2 is a kind of quick Shear Strengthening box-beam structure sectional view of Prestressed U type muscle.
Fig. 3 is a kind of quick Shear Strengthening box-beam structure side view of Prestressed U type muscle.
Fig. 4 is the structural schematic diagram of angle-style anchor and anchor ring.
Fig. 5 is the structural schematic diagram of U-shaped muscle and anchor ring.
Fig. 6 is a kind of implementation flow chart of quick Shear Strengthening box-beam structure method of Prestressed U type muscle.
Fig. 7 is the radiused processing stereoscopic schematic diagram of concrete box girder construction.
Fig. 8 is the radiused processing sectional view of concrete box girder construction.
Fig. 9 is concrete box girder construction fixed angle type anchor stereoscopic schematic diagram.
Figure 10 is concrete box girder construction fixed angle type anchor sectional view.
Figure 11 is concrete box girder construction fixed angle type anchor side view.
Figure 12 is that concrete box girder construction installs U-shaped muscle and applies prestressing force process stereoscopic schematic diagram.
Figure 13 is that concrete box girder construction installs U-shaped muscle and applies prestressing force process sectional view.
Figure 14 is that concrete box girder construction installs U-shaped muscle and applies prestressing force process side view.
Figure 15 is concrete box girder construction installation grid muscle stereoscopic schematic diagram.
Figure 16 is concrete box girder construction installation grid muscle sectional view.
Figure 17 is concrete box girder construction installation grid muscle side view.
Figure 18 is concrete box girder structure setting crack resist at mortar layer stereoscopic schematic diagram.
Figure 19 is concrete box girder structure setting crack resist at mortar layer cross section figure.
Figure 20 is concrete box girder structure setting crack resist at mortar layer side view.
In the accompanying drawings, 1 is angle-style anchor, and 2 be anchor ring, and 3 be U-shaped muscle, and 4 be grid muscle, and 5 be concrete box girder, and 6 are
Crack resist at mortar layer, 11 be reserved slot, and 12 be anchor bolt, and 41 be to prick item.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
As shown in the picture, the quick Shear Strengthening box-beam structure of a kind of Prestressed U type muscle, by angle-style anchor 1, anchor ring 2,
U-shaped muscle 3, grid muscle 4, concrete box girder 5, crack resist at mortar layer 6 collectively constitute, and U-shaped muscle 3 is perpendicular to 5 axial direction side of concrete box girder
It is in U-shape arranged for interval to the side and bottom surface along concrete box girder 5, arranges 0.3~1.5m of spacing, U-shaped 3 both ends of muscle pass through angle
Type anchor 1, anchor ring 2 are fixed on two side surface upper parts of concrete box girder 5, angle-style anchor 1 and concrete box girder 5 it
Between 5 side of concrete box girder is fixed on by anchor bolt 12 and structure glue, U-shaped muscle 3 passes through the reserved slot of angle-style anchor 1
11, U-shaped muscle 3 is by the application prestressing force of anchor ring 2 and the outside of the reserved slot 11 of angle-style anchor 1, anchor ring 2 are fixed in both ends
It is threadably secured and connect between U-shaped muscle 3, grid muscle 4 is hung on the outer surface of concrete box girder 5 side and bottom surface, and passes through
The bundle item 41 of dispersed placement and U-shaped muscle 3 binding connect, crack resist at mortar layer 6 injection, smear or covered by way of pouring U-shaped
Muscle 3 and grid muscle 4, and be combined into one with concrete box girder 5.
The grid muscle 4 be one of steel wire, web, wire rope net, diameter≤8mm, grid spacing≤
300mm。
The side of the concrete box girder 5 and bottom surface intersection corner angle carry out radiused processing, radiused radius >=25mm.
The U-shaped muscle 3 is continuous U-shaped metal ribs, and both ends are provided with external screw thread matched with anchor ring 2.By U-shaped
The construction of muscle 3, presstressed reinforcing steel is continuous in three circumferential directions, increases presstressed reinforcing steel length, reduces loss of prestress；U-shaped muscle 3
Directly the function of shearing resistance is provided for box beam；U-shaped muscle 3 applies prestressing force by anchor ring, reduces the ruler of anchorage to the greatest extent
It is very little.
The U-shaped muscle 3 applies prestressing force and is realized by tightening anchor ring 2, and it is true by prestressed size that anchor ring 2 tightens circle number
It is fixed, to determine that prestressed size provides maximum convenience.
The crack resist at mortar layer 6 is mixed with the one of steel fibre, polypropylene fibre, glass fibre, carbon fiber and plant fiber
Kind is several.Grid muscle 4 and 6 collective effect of crack resist at mortar layer provide crack resistance and stability, and then add concrete box girder
Gu lasts are effective.
A kind of quick Shear Strengthening box-beam structure method of Prestressed U type muscle, it is U-shaped by fixed angle type anchor, installation
Muscle applies prestressing force, and repetition installs U-shaped muscle and applies prestressing force, installs grid muscle and crack resist at mortar layer is arranged, realize to box beam
The quick Shear Strengthening of structure：
A. it is surface-treated：5 concrete surface of concrete box girder is handled, it is sufficiently clear by its surface concrete dabbing
Except spots such as the weak floor of original concrete surface, cement laitance coating and greases, until exposing solid surface, to concrete box girder 5
Side and bottom surface intersection corner angle carry out radiused processing；
B. fixed angle type anchor：Angle-style anchor 1 is fixed on concrete box girder 5 by anchor bolt 12 and structure glue
Side；
C., U-shaped muscle is installed：The both ends of each single u-shaped muscle 3 are successively passed through to the reserved slot 11 of angle-style anchor 1.
D. apply prestressing force：After U-shaped muscle 3 is installed in place, it is screwed to certain circle number by anchor ring 2, carrys out the U-shaped muscle 3 of tensioning；
E. it repeats that U-shaped muscle is installed and applies prestressing force：Repeat step C~D.
F., grid muscle is installed：Grid muscle 4 is carried out by the size of design requirement to lay, and at least one layer of grid muscle 4 is coated on
The surface of concrete box girder 5, grid muscle 4 are connected by the bundle item 41 of dispersed placement and the binding of U-shaped muscle 3.
G., crack resist at mortar layer is set：Crack resist at mortar layer 6 injection, smear or cover by way of pouring U-shaped muscle 3 and grid
Muscle 4, and be combined into one with concrete box girder 5.
H. maintenance protection：Wet curing is carried out to crack resist at mortar layer 6, the end and anchor ring 2 of U-shaped muscle 3 are protected.
Claims (7)
1. a kind of quick Shear Strengthening box-beam structure of Prestressed U type muscle, by angle-style anchor (1), anchor ring (2), U-shaped muscle (3),
Grid muscle (4), concrete box girder (5), crack resist at mortar layer (6) collectively constitute, and U-shaped muscle (3) is axial perpendicular to concrete box girder (5)
Direction is in U-shape arranged for interval along the side and bottom surface of concrete box girder (5), arranges 0.3~1.5m of spacing, U-shaped muscle (3) both ends
Two side surface upper parts of concrete box girder (5), angle-style anchor (1) are fixed on by angle-style anchor (1), anchor ring (2)
Concrete box girder (5) side is fixed on by anchor bolt (12) and structure glue between concrete box girder (5), U-shaped muscle (3) passes through angle
The reserved slot (11) of type anchor (1), U-shaped muscle (3) applies prestressing force by anchor ring (2) and both ends are fixed on angle-style and are anchored
The outside of the reserved slot (11) of device (1), is threadably secured between anchor ring (2) and U-shaped muscle (3) and connect, and grid muscle (4) is hung
It is connected in the outer surface of concrete box girder (5) side and bottom surface, and by the bundle item (41) of dispersed placement and U-shaped muscle (3) binding,
Crack resist at mortar layer (6) injection, smear or cover by way of pouring U-shaped muscle (3) and grid muscle (4), and and concrete box girder
(5) it is combined into one.
2. the quick Shear Strengthening box-beam structure of a kind of Prestressed U type muscle according to claim 1, which is characterized in that described
Grid muscle (4) be one of steel wire, web, wire rope net, diameter≤8mm, grid spacing≤300mm.
3. the quick Shear Strengthening box-beam structure of a kind of Prestressed U type muscle according to claim 1, which is characterized in that described
Concrete box girder (5) side and bottom surface intersection corner angle carry out radiused processing, radiused radius >=25mm.
4. the quick Shear Strengthening box-beam structure of a kind of Prestressed U type muscle according to claim 1, which is characterized in that described
U-shaped muscle (3) be continuous U-shaped metal ribs, both ends be provided with anchor ring (2) matched external screw thread.
5. the quick Shear Strengthening box-beam structure of a kind of Prestressed U type muscle according to claim 1, which is characterized in that described
U-shaped muscle (3) apply prestressing force by tighten anchor ring (2) realize, anchor ring (2) tighten circle number determined by prestressed size.
6. the quick Shear Strengthening box-beam structure of a kind of Prestressed U type muscle according to claim 1, which is characterized in that described
Crack resist at mortar layer (6) mixed with steel fibre, polypropylene fibre, glass fibre, carbon fiber and plant fiber one or more.
7. a kind of quick Shear Strengthening box-beam structure method of Prestressed U type muscle, it is characterised in that by fixed angle type anchor,
U-shaped muscle is installed, applies prestressing force, repetition installs U-shaped muscle and applies prestressing force, installs grid muscle and crack resist at mortar layer is arranged, real
Now to the quick Shear Strengthening of box-beam structure：
A. it is surface-treated：Concrete box girder (5) concrete surface is handled, its surface concrete dabbing is sufficiently removed
The spots such as weak floor, cement laitance coating and the grease of original concrete surface, until exposing solid surface, to concrete box girder (5)
Side and bottom surface intersection corner angle carry out radiused processing；
B. fixed angle type anchor：Angle-style anchor (1) is fixed on concrete box girder by anchor bolt (12) and structure glue
(5) side；
C., U-shaped muscle is installed：The both ends of each single u-shaped muscle (3) are successively passed through to the reserved slot (11) of angle-style anchor (1).
D. apply prestressing force：After U-shaped muscle (3) installation in place, it is screwed to certain circle number by anchor ring (2), carrys out the U-shaped muscle of tensioning
(3)；
E. it repeats that U-shaped muscle is installed and applies prestressing force：Repeat step C~D.
F., grid muscle is installed：Grid muscle (4) are carried out by the size of design requirement to lay, and at least one layer of grid muscle (4) is coated on
The surface of concrete box girder (5), grid muscle (4) are connected by the bundle item (41) of dispersed placement and U-shaped muscle (3) binding.
G., crack resist at mortar layer is set：Crack resist at mortar layer (6) injection, smear or cover by way of pouring U-shaped muscle (3) and grid
Muscle (4), and be combined into one with concrete box girder (5).
H. maintenance protection：Wet curing is carried out to crack resist at mortar layer (6), end and anchor ring (2) to U-shaped muscle (3) are protected.
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| CN109610349A (en) * | 2018-12-29 | 2019-04-12 | 北京工业大学 | A kind of the PC box girder web ruggedized construction and method of built-in tiltedly netting piece |
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| Л.B.扎哈洛夫: "装配式钢筋混凝土连续桥跨结构", vol. 1, 中国铁道出版社, pages: 176 - 192 * |
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| CN113802474A (en) * | 2021-08-31 | 2021-12-17 | 中国建筑土木建设有限公司 | Half-width bridge beam-slab stabilizing device and construction method for keeping bridge open in half width |
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| CN115217347A (en) * | 2022-07-27 | 2022-10-21 | 广东东荣建筑工程有限公司 | Supporting beam carbon fiber reinforcing structure for energy-saving building |
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