CN114908686A - Lifting and reinforcing method for bearing capacity of inclined leg rigid frame bridge - Google Patents
Lifting and reinforcing method for bearing capacity of inclined leg rigid frame bridge Download PDFInfo
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- CN114908686A CN114908686A CN202210521626.1A CN202210521626A CN114908686A CN 114908686 A CN114908686 A CN 114908686A CN 202210521626 A CN202210521626 A CN 202210521626A CN 114908686 A CN114908686 A CN 114908686A
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 103
- 239000010959 steel Substances 0.000 claims abstract description 103
- 239000004567 concrete Substances 0.000 claims abstract description 21
- 238000010276 construction Methods 0.000 claims abstract description 12
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 11
- 239000010410 layer Substances 0.000 claims description 75
- 230000002787 reinforcement Effects 0.000 claims description 22
- 239000011150 reinforced concrete Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000011376 self-consolidating concrete Substances 0.000 claims description 4
- 239000011241 protective layer Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 description 3
- 238000012946 outsourcing Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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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
- E01D19/00—Structural or constructional details of 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
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a method for lifting and reinforcing the bearing capacity of an inclined leg rigid frame bridge, which comprises the following steps: firstly, chiseling an original bridge deck pavement and an original filling and leveling layer; secondly, temporarily supporting the span of the main beam by using a steel pipe upright post; thirdly, reinforcing the main beam; fourthly, pouring a filling and leveling layer; fifthly, paving a construction concrete bridge deck; sixthly, reinforcing the girder span middle and outer steel plates; and seventhly, dismantling the steel pipe upright post. According to the invention, the girder is externally coated with the reinforcing layer, and the embedded steel bars and the hoop steel bars are added to extend the hoop steel bars in the externally coated reinforcing layer into the bridge deck reinforcing steel bar net rack, so that the girder and the bridge deck are paved into a whole, namely, the thin rectangular section girder of the original bridge is transformed into a T-shaped section, and the bearing capacity of the inclined leg rigid frame bridge is improved; in addition, temporary supports are added in the construction stage, most of newly added load is borne by the transformed T-shaped cross section through the construction mode of unloading, midspan supporting, loading and support dismantling, the stress increment of the main beam of the original structure is effectively reduced, and the stress safety of the inclined leg rigid frame bridge is guaranteed.
Description
Technical Field
The invention belongs to the technical field of blasting construction of tunnel engineering, and particularly relates to a method for improving and reinforcing bearing capacity of an inclined leg rigid frame bridge.
Background
Compared with a beam bridge, the rigid frame arch bridge has the characteristics of light structure, strong spanning capability and convenient construction, and a large number of bridges are in the bridge type of the rigid frame arch bridge in the construction process of mountainous areas in China in the last 80 th century; in recent years, with the increase of traffic volume, particularly with the sharp increase of national provincial traffic volume and heavy vehicle mixing proportion, the defects of low standard of bridge design load, complex stress and poor transverse connection are exposed, and typical diseases such as micro-bent plate damage, arch sheet cracking, midspan downwarping and the like occur.
The inclined leg rigid frame bridge is a bridge with a bridge span structure (main beam) and a support (inclined leg) which are integrally connected in an inclined mode. Common reinforcing methods for the slant-leg rigid frame bridge include increasing the cross section, adding a cross beam, adhering a steel plate and the like. However, the above method of increasing the cross section and the method of adding the beam can greatly increase the dead load of the structure, greatly damage the original structure in the reinforcing process, and increase the burden of the original structure; the effect of improving the overall bearing capacity of the structure is not obvious except for local reinforcement by the pasting steel plate. Therefore, aiming at the rigid frame arch bridge, a reinforcing method which can lighten the burden of the original structure, has small damage to the original structure and can obviously improve the integrity and the bearing capacity is lacked.
Disclosure of Invention
The invention aims to solve the technical problem that the prior art is not enough, and provides a method for improving and reinforcing the bearing capacity of an inclined leg rigid frame bridge, which comprises the steps of chiseling an original bridge deck pavement and an original filling and leveling layer, arranging a main beam outer-coating reinforcing layer on the lower edge of a main beam, and increasing embedded bars and stirrups to extend stirrups in the outer-coating reinforcing layer into a bridge deck reinforcing steel bar net rack so that the main beam and the bridge deck pavement are integrated, namely, the single-thin rectangular section main beam of the original bridge is changed into a T-shaped section, and the bearing capacity of the inclined leg rigid frame bridge is improved; in addition, temporary supports are added in the construction stage, most of newly added load is borne by the transformed T-shaped cross section through the construction mode of unloading, midspan supporting, loading and support dismantling, the stress increment of the main beam of the original structure is effectively reduced, and the stress safety of the inclined leg rigid frame bridge is guaranteed.
In order to solve the technical problems, the invention adopts the technical scheme that: a lifting and reinforcing method for bearing capacity of an inclined leg rigid frame bridge is characterized by comprising the following steps:
the method comprises the following steps of firstly, chiseling an original bridge deck pavement and an original filling and leveling layer: chiseling an original bridge deck pavement and a guardrail of the rigid frame bridge, chiseling an original filling flat layer at the bottom of the original bridge deck pavement, and reserving an original micro-bent plate and a cantilever plate as templates;
step two, adopting the steel pipe upright post to temporarily support the girder span: supporting a vertical steel pipe upright post in the span of each main beam, installing a jack at the upper end of each steel pipe upright post, jacking up the main beam through the jack, and further temporarily supporting the main beam;
step three, reinforcing a main beam: wrapping reinforced concrete on two sides and the bottom of the main beam to form a main beam outer wrapping reinforcing layer, and forming a new main beam by the main beam and the main beam outer wrapping reinforcing layer;
the stirrups of the girder outer wrapping reinforcing layer extend upwards to a new bridge deck pavement design position;
step four, pouring a filling and leveling layer: arranging a plurality of reinforcing ribs for connecting with stirrups of a reinforcing layer coated outside the main beam above the main beam, and pouring a new filling and leveling layer on the original micro-bent plate and the cantilever plate by adopting early-strength self-compacting concrete;
step five, paving a concrete bridge deck: binding a bridge deck reinforcing steel bar net rack on the filling and leveling layer and pouring concrete to form new bridge deck pavement, and constructing guardrails on two sides of the bridge deck pavement;
the bridge deck steel bar net rack is bound and fixed with stirrups of the reinforcing layer coated outside the main beam, and a T-shaped combined cross section is formed between the new main beam and the bridge deck pavement;
step six, reinforcing the girder span middle and outside steel plates: steel plates are pasted at the bottom and two sides of the girder outer reinforcing layer in the new girder span for reinforcing;
step seven, dismantling the steel pipe upright post: and (4) dismantling the steel pipe upright posts and jacks in the main girder span to finish the lifting and reinforcing of the bearing capacity of the inclined leg rigid frame bridge.
The method for improving and reinforcing the bearing capacity of the inclined leg rigid frame bridge is characterized by comprising the following steps: in the first step, when the bridge deck pavement above the cantilever plate is chiseled, chiseling is carried out from the fixed end of the cantilever plate to the direction of the cantilever end, and the bridge deck pavement within a set width range above the fixed end of the cantilever plate is cut and chiseled firstly; then reinforcing the cantilever plate by arranging a steel bar pull rod on the cantilever end of the cantilever plate and the top of the main beam by adopting a bar planting process; and finally, chiseling the bridge deck pavement of the rest part above the cantilever plate.
The method for improving and reinforcing the bearing capacity of the inclined leg rigid frame bridge is characterized by comprising the following steps of: and in the second step, the jacking height of the main beam is not more than 5 mm.
The method for improving and reinforcing the bearing capacity of the inclined leg rigid frame bridge is characterized by comprising the following steps of: and in the second step, two steel pipe stand columns are sequentially distributed in the longitudinal bridge direction in a supporting mode in the midspan of each main beam, and the plurality of steel pipe stand columns are connected through horizontal supports and inclined supports to form a lattice structure.
The method for improving and reinforcing the bearing capacity of the inclined leg rigid frame bridge is characterized by comprising the following steps of: and in the third step, before the reinforced concrete is wrapped on the lower edge of the girder, chiseling the concrete protective layer at the top of the girder, lengthening the vertical steel bars and the stirrups of the girder and extending the vertical steel bars and the stirrups to a new designed position for bridge deck pavement, and binding and fixing the sections of the girder, which are lengthened by the vertical steel bars and the stirrups, by adding the reinforcing bars.
The method for improving and reinforcing the bearing capacity of the inclined leg rigid frame bridge is characterized by comprising the following steps of: and in the third step, wrapping reinforced concrete outside the oblique legs to form an external reinforced layer of the oblique legs while wrapping reinforced concrete outside the two sides and the bottom of the main beam.
The method for improving and reinforcing the bearing capacity of the inclined leg rigid frame bridge is characterized by comprising the following steps of: the outer wrapping reinforcement layer of the oblique leg is annularly arranged, when the outer wrapping reinforcement layer of the oblique leg is constructed, firstly, steel bars are planted on the outer side of the oblique leg to serve as a steel bar framework, then, oblique steel bars and oblique stirrups are bound, and finally, templates are erected on the outer side of the oblique leg to pour concrete;
the outer reinforcing layer of the main beam is in a horseshoe shape, when the outer reinforcing layer of the main beam is constructed, firstly, ribs are respectively planted at the bottom and two sides of the main beam to serve as steel reinforcement frameworks, then longitudinal steel reinforcements and transverse stirrups are bound, and finally, a template is erected outside the main beam to pour concrete.
The method for improving and reinforcing the bearing capacity of the inclined leg rigid frame bridge is characterized by comprising the following steps of: and step six, forming a whole between the girder outer wrapping reinforcing layer and the steel plate by adopting a wet pasting method.
The method for improving and reinforcing the bearing capacity of the inclined leg rigid frame bridge is characterized by comprising the following steps of: and seventhly, when the steel pipe stand columns and the jacks are dismantled, sequentially relieving the pressure of the jacks supported below the plurality of main beams to enable piston rods of the jacks to retract and be separated from the main beams, and then synchronously dismantling the plurality of steel pipe stand columns.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the outer-wrapped reinforcement layer of the main beam is arranged on the lower edge of the main beam, so that the original main beam can be effectively reinforced, the structural strength and the bearing capacity of the reinforced main beam are obviously improved, and the bearing capacity of the whole inclined leg rigid frame bridge can be effectively improved.
2. According to the invention, the original bridge deck pavement and the original filling and leveling layer are chiseled off, the stirrups of the reinforcing layer outside the main beam extend upwards into the bridge deck reinforcing steel bar net rack and are bound and fixed with the bridge deck reinforcing steel bar net rack, and the new filling and leveling layer and the bridge deck pavement are constructed, so that the main beam and the bridge deck pavement form a whole, and a T-shaped combined section is formed to jointly bear the load on the bridge, the stress increment of the main beam can be effectively reduced, and the stress safety of the whole rigid frame bridge is ensured.
3. According to the invention, the temporary support is carried out on the girder span by adopting the steel pipe upright post after the original bridge deck pavement and the original filling leveling layer are chiseled off, so that the phenomenon that the newly increased load is directly applied to the original girder in the reinforcement process of the inclined leg rigid frame bridge and the original girder is damaged can be effectively avoided.
4. According to the invention, the span of the main beam is externally adhered with the steel plate for reinforcement, so that the bending resistance and the shearing resistance of the span of the main beam can be effectively improved, the bearing capacity of the main beam can be further improved, and the service life of the main beam can be further prolonged.
In conclusion, the original bridge deck pavement and the original filling and leveling layer are chiseled, then the girder outer-wrapping reinforcing layer is arranged on the lower edge of the girder, and the embedded steel bars and the hoop steel bars are added to extend the hoop steel bars in the outer-wrapping reinforcing layer into the bridge deck steel bar net rack, so that the girder and the bridge deck pavement are integrated, namely, the single-thin rectangular section girder of the original bridge is reformed into a T-shaped section, and the bearing capacity of the inclined leg rigid frame bridge is improved; in addition, temporary supports are added in the construction stage, most of newly added load is borne by the modified T-shaped cross section through the construction mode of unloading, midspan supporting, loading and support dismantling, the stress increment of the main beam of the original structure is effectively reduced, and the stress safety of the inclined leg rigid frame bridge is guaranteed.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a block diagram of the process flow of the present invention.
FIG. 2 is a cross-sectional view of the reinforcement of the slant-leg rigid frame bridge of the present invention.
Fig. 3 is a sectional view taken along line a-a of fig. 2.
Fig. 4 is a schematic view of the reinforcing bar binding structure of fig. 3.
Fig. 5 is an enlarged view of fig. 4 at C.
Fig. 6 is a sectional view taken along line B-B of fig. 2.
Fig. 7 is a schematic view of the reinforcing bar banding structure of fig. 6.
Description of reference numerals:
1, paving a bridge deck; 1-bridge deck steel bar net rack; 2-leveling layer;
3-slightly bending the plate; 4-cantilever plate; 5, a main beam;
6-oblique legs; 7, wrapping a reinforcing layer outside the inclined leg; 7-1-oblique reinforcing steel bars;
7-2-oblique stirrups; 8, wrapping a reinforcing layer outside the main beam; 8-1-longitudinal steel bar;
8-2-transverse stirrups; 9-steel tube column; 10-a jack;
11-steel plate; 12-reinforcing ribs.
Detailed Description
Fig. 1 to 7 show a method for lifting and reinforcing the bearing capacity of a slant-leg rigid frame bridge, which comprises the following steps:
the method comprises the following steps of firstly, chiseling an original bridge deck pavement and an original filling and leveling layer: chiseling an original bridge deck pavement and a guardrail of the rigid frame bridge, chiseling an original filling flat layer at the bottom of the original bridge deck pavement, and keeping an original micro-bent plate 3 and a cantilever plate 4 as templates;
when the guardrail is actually used, the guardrail is firstly dismantled, and then bridge deck pavement and chiseling removal of the filling and leveling layer are carried out after the guardrail is dismantled.
Step two, adopting the steel pipe upright post to temporarily support the girder span: a vertical steel pipe upright post 9 is supported in the span of each main beam 5, a jack 10 is arranged at the upper end of each steel pipe upright post 9, and the main beam 5 is jacked up through the jack 10 so as to temporarily support the main beam 5;
during the in-service use, jack 10 is vertical the laying, and the external diameter of steel pipe stand 9 is 400mm, and the pipe thickness of steel pipe stand 9 is 10mm, and the jacking power of steel pipe stand 9 is 5t, when adopting steel pipe stand 9 to support the girder, jack 10 through steel pipe stand 9 top is with girder jack-up take the altitude.
It should be noted that, after the procedures such as bridge deck pavement of the original structure are chiseled out, the unloading work of the original structure before reinforcement is completed, at this time, the original girder 5 is supported temporarily in the midspan, the newly increased load in the reinforcement process of the inclined leg rigid frame bridge cannot be directly applied to the original girder 5, but the newly increased load is jointly borne by the new structure after the original girder 5 is transformed into the T-shaped section, so that the stress increment of the original structure can be obviously reduced, and the structural stress is improved.
Step three, reinforcing a main beam: wrapping reinforced concrete on two sides of the main beam 5 and the bottom of the main beam to form a main beam outer wrapping reinforcing layer 8, and forming a new main beam by the main beam 5 and the main beam outer wrapping reinforcing layer 8;
as shown in fig. 4 and 5, the stirrups of the girder outer wrapping reinforcing layer 8 extend upwards to a new design position of the bridge deck pavement;
during the in-service use, through set up girder outsourcing back up coat 8 at 5 lower edges of girder, can effectively consolidate original girder 5, and then make the structural strength and the bearing capacity of new girder after the reinforcement show the improvement, and then can effectively improve whole oblique leg rigid frame bridge bearing capacity.
It should be noted that, the stirrups wrapping the reinforcing layer 8 outside the main beam extend upwards to the new bridge deck pavement design position, so that the new main beam and the new bridge deck pavement form a whole, and a T-shaped combined cross section is formed to jointly bear the load on the bridge, thereby effectively reducing the stress increment of the main beam and ensuring the stress safety of the whole rigid frame bridge.
Step four, pouring a filling and leveling layer: arranging a plurality of reinforcing ribs 12 for connecting with stirrups of a reinforcing layer 8 coated outside the main beam above the main beam 5, and pouring a new filling and leveling layer 2 on the original micro-bent plate 3 and the cantilever plate 4 by adopting early-strength self-compacting concrete;
during actual use, the reinforcing ribs 12 are horizontally arranged and longitudinally arranged along a bridge, the reinforcing ribs 12 are positioned on the inner sides of stirrups of the girder outer wrapping reinforcing layers 8, and the arrangement of the reinforcing ribs 12 can enable the girder, the filling and leveling layers 2 and the bridge deck reinforcing steel bar net rack 1-1 to be connected into a whole, so that the bearing capacity of the bridge is improved.
Step five, paving a concrete bridge deck: binding a bridge deck reinforcing steel bar net rack 1-1 on the filling layer 2, pouring concrete to form a new bridge deck pavement 1, and constructing guardrails on two sides of the bridge deck pavement 1;
as shown in fig. 4 and 5, the bridge deck steel bar net rack 1-1 and the stirrups of the girder outer-wrapped reinforcing layer 8 are bound and fixed, and a T-shaped combined cross section is formed between a new girder and the bridge deck pavement 1;
when the novel bridge deck pavement 1 is actually used, after the concrete strength of the bridge deck pavement 1 meets the requirement, the construction of the guardrail is carried out, the thickness of the novel bridge deck pavement 1 is 16 cm-20 cm, and the bridge deck pavement 1 is cast by C40 concrete.
It should be noted that the bridge deck pavement 1 and the leveling layer 2 are both cast with concrete, which can effectively improve the integrity of the bridge deck pavement 1 and the leveling layer 2.
Step six, reinforcing the girder span middle and outside steel plates: as shown in fig. 2 and 3, steel plates 11 are adhered to the bottom and two sides of the girder outer reinforcing layer 8 in the new girder span for reinforcement;
in practical use, the steel plate 11 at the bottom of the main beam outer-wrapping reinforcing layer 8 and the steel plates 11 at two sides are welded and fixed together to form a U-shaped steel plate, the steel plate 11 is processed by adopting a Q355NHC weather-resistant steel plate with the thickness of 6mm, and the U-shaped steel plate 11 is wrapped outside the lower edge of the new main beam span, so that the bending resistance and the shearing resistance of the new main beam can be effectively improved.
Step seven, dismantling the steel pipe upright post: and (3) dismantling the steel pipe upright posts 9 and the jacks 10 in the main girder span to finish the lifting and reinforcing of the bearing capacity of the inclined leg rigid frame bridge.
When the bridge deck is actually used, after the concrete strength of the newly poured bridge deck pavement 1 and the newly poured filling and leveling layer 2 reaches the design strength, the steel pipe upright posts 9 and the jacks 10 in the main beam span are removed; at the moment, the bridge deck pavement 1 and the reinforced main beam form a T-shaped combined structure to bear the dead weight and live load of the guardrail together.
In the first step, when the bridge deck pavement above the cantilever plate 4 is chiseled, the fixed end of the cantilever plate 4 chisels in the direction of the cantilever end, and the bridge deck pavement within the set width range above the fixed end of the cantilever plate 4 is cut and chiseled firstly; then reinforcing the cantilever plate 4 by arranging a steel bar pull rod on the cantilever end of the cantilever plate 4 and the top of the main beam 5 by adopting a bar planting process; and finally, chiseling the rest part of the bridge deck pavement above the cantilever plate 4.
In practice, the bridge deck pavement within the width range of 20cm above the fixed end of the cantilever plate 4 is cut and chiseled, and preferably, the steel bar pull rods are vertically arranged and the diameter of the steel bar pull rods is preferably 16 mm.
It should be noted that, the one end of reinforcing bar pull rod is connected in cantilever end bottom of cantilever board 4, and the other end of reinforcing bar pull rod is connected at 5 tops of girder, and the setting of reinforcing bar pull rod can effectively guarantee cantilever board 4's stability, can effectively avoid cantilever board 4 to take place the slope simultaneously, and then guarantees the bridge deck pavement quality.
In the specific implementation, in the second step, the jacking height of the main beam 5 is not more than 5 mm.
During the in-service use, the jack-up height of girder 5 is 5mm generally, can effectively support girder 5, can not cause the damage to girder 5 simultaneously.
In the second step, two steel pipe columns 9 are sequentially arranged in the span of each main beam 5 along the longitudinal bridge direction, and the steel pipe columns 9 are connected through horizontal struts and inclined struts to form a lattice structure.
During the in-service use, girder 5 span two interval between the steel pipe stand 9 is 2m, and the bottom of steel pipe stand 9 is provided with the C25 concrete foundation of length 7.8m, width 3.2m, thickness 1.5m, connects a plurality of steel pipe stands 9 through horizontal brace and bracing and forms lattice structure, can effectively improve steel pipe stand 9's support stability, avoids single steel pipe stand 9 unstability.
In the third step, before the reinforced concrete is coated on the lower edge of the main beam 5, the concrete protective layer on the top of the main beam 5 is chiseled, the vertical steel bars and the stirrups of the main beam 5 are lengthened and extended to the new designed position of the bridge deck pavement, and the reinforcing ribs 12 are additionally arranged to bind and fix the sections of the main beam 5, which are lengthened by the vertical steel bars and the stirrups, as shown in fig. 4 and 5.
During the in-service use, all be higher than the bottom of bridge deck pavement 1 after the vertical reinforcement and the stirrup of girder 5 connect to be laid and be less than the top of bridge deck pavement 1 and lay, through connect the vertical reinforcement and the stirrup of girder 5 and extend to the bridge pavement in, can make original girder 5 and the bridge deck pavement of newly pouring form whole and undertake the on-bridge load jointly, can further reduce the stress increment of new girder, guarantee the atress safety of whole rigid frame bridge.
It should be noted that, a reinforcing bar 12 is arranged at the intersection of the vertical steel bar extension section and the stirrup extension section of the main beam 5.
In the third step, reinforced concrete is coated outside the two sides and the bottom of the main beam 5, and simultaneously, reinforced concrete is coated outside the inclined leg 6 to form an inclined leg outer coating reinforcing layer 7, as shown in fig. 6 and 7.
During the in-service use, through set up oblique leg outsourcing back up coat 7 in the 6 outsides of oblique leg, can further consolidate the girder, improve the bearing capacity and the life of girder.
In specific implementation, the outer wrapping reinforcement layer 7 of the oblique leg is annularly arranged, when the outer wrapping reinforcement layer 7 of the oblique leg is constructed, firstly, steel bars are planted on the outer side of the oblique leg 6 to serve as a steel bar framework, then, the oblique steel bars 7-1 and the oblique stirrups 7-2 are bound, and finally, a template is erected on the outer side of the oblique leg 6 to pour concrete;
the girder outer-coated reinforcing layer 8 is in a horseshoe shape, when the girder outer-coated reinforcing layer 8 is constructed, firstly, ribs are respectively planted at the bottom and two sides of the girder 5 to serve as steel reinforcement frameworks, then, longitudinal steel reinforcements 8-1 and transverse stirrups 8-2 are bound, and finally, a template is erected outside the girder 5 to pour concrete.
In the sixth step, in a specific implementation, the girder outer wrapping reinforcing layer 8 and the steel plate 11 are integrated by a wet bonding method.
In actual use, when the steel plate 11 is constructed, firstly, the steel plate 11 needs to be fixed by planting anchor bolts on the girder outer-wrapped reinforcing layer 8, and then self-compacting concrete is poured into a gap between the girder outer-wrapped reinforcing layer 8 and the steel plate 11 to form a whole.
During specific implementation, in the seventh step, when the steel pipe columns 9 and the jacks 10 are removed, the jacks 10 supported below the plurality of main beams are sequentially decompressed, so that piston rods of the jacks 10 retract to be separated from the main beams, and then the plurality of steel pipe columns 9 are removed synchronously.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. A lifting and reinforcing method for bearing capacity of an inclined leg rigid frame bridge is characterized by comprising the following steps:
the method comprises the following steps of chiseling an original bridge deck pavement and an original filling and leveling layer: chiseling an original bridge deck pavement and a guardrail of the rigid frame bridge, chiseling an original filling flat layer at the bottom of the original bridge deck pavement, and reserving an original micro-bent plate (3) and a cantilever plate (4) as templates;
step two, adopting the steel pipe upright post to temporarily support the girder span: a vertical steel pipe upright post (9) is supported in the span of each main beam (5), a jack (10) is installed at the upper end of each steel pipe upright post (9), and the main beam (5) is jacked up through the jack (10) so as to temporarily support the main beam (5);
step three, reinforcing a main beam: wrapping reinforced concrete on two sides of the main beam (5) and the bottom of the main beam to form a main beam wrapping reinforcing layer (8), and forming a new main beam by the main beam (5) and the main beam wrapping reinforcing layer (8);
wherein, the stirrups of the girder outer wrapping reinforcing layer (8) extend upwards to a new bridge deck pavement design position;
step four, pouring a filling and leveling layer: arranging a plurality of reinforcing ribs (12) which are used for being connected with stirrups of an outer reinforcing layer (8) of the main beam above the main beam (5), and pouring a new filling layer (2) on the original micro-bent plate (3) and the cantilever plate (4) by adopting early-strength self-compacting concrete;
step five, paving a concrete bridge deck: binding a bridge deck reinforcing steel bar net rack (1-1) on the filling layer (2), pouring concrete to form a new bridge deck pavement (1), and constructing guardrails on two sides of the bridge deck pavement (1);
wherein the bridge deck reinforcing steel bar net rack (1-1) is bound and fixed with stirrups of the girder outer wrapping reinforcing layer (8), and a T-shaped combined section is formed between a new girder and the bridge deck pavement (1);
step six, reinforcing the girder span middle and outside steel plates: steel plates (11) are adhered to the bottom and two sides of a main beam outer wrapping reinforcing layer (8) in a new main beam span for reinforcing;
step seven, dismantling the steel pipe upright post: and (3) dismantling the steel pipe upright post (9) and the jack (10) in the girder span to finish the lifting and reinforcing of the bearing capacity of the inclined leg rigid frame bridge.
2. The method for lifting and reinforcing the bearing capacity of the inclined leg rigid frame bridge according to claim 1, which is characterized in that: in the first step, when the bridge deck pavement above the cantilever plate (4) is chiseled, the fixed end of the cantilever plate (4) chisels in the direction of the cantilever end, and the bridge deck pavement above the fixed end of the cantilever plate (4) within a set width range is cut and chiseled firstly; then reinforcing steel bar pull rods are arranged at the cantilever end of the cantilever plate (4) and the top of the main beam (5) by adopting a bar planting process to reinforce the cantilever plate (4); and finally, chiseling the bridge deck pavement of the rest part above the cantilever plate (4).
3. The method for lifting and reinforcing the bearing capacity of the inclined leg rigid frame bridge according to claim 1, which is characterized in that: in the second step, the jacking height of the main beam (5) is not more than 5 mm.
4. The method for lifting and reinforcing the bearing capacity of the inclined-leg rigid frame bridge according to claim 1, which is characterized in that: in the second step, two steel pipe upright columns (9) are sequentially distributed in the longitudinal bridge direction in a span-in supporting mode of each main beam (5), and the steel pipe upright columns (9) are connected through horizontal supports and inclined supports to form a lattice structure.
5. The method for lifting and reinforcing the bearing capacity of the inclined leg rigid frame bridge according to claim 1, which is characterized in that: in the third step, before the reinforced concrete is wrapped outside the lower edge of the main beam (5), firstly, the concrete protective layer at the top of the main beam (5) is chiseled, then the vertical steel bars and the stirrups of the main beam (5) are lengthened and extended to the new designed position of the bridge deck pavement, and the reinforcing bars (12) are additionally arranged to bind and fix the vertical steel bars and the sections of the main beam (5) after the stirrups are lengthened.
6. The method for lifting and reinforcing the bearing capacity of the inclined leg rigid frame bridge according to claim 1, which is characterized in that: and in the third step, reinforced concrete is coated outside the two sides and the bottom of the main beam (5) and simultaneously the reinforced concrete is coated outside the inclined legs (6) to form an inclined leg outer coating reinforcing layer (7).
7. The method for lifting and reinforcing the bearing capacity of the inclined leg rigid frame bridge according to claim 6, which is characterized in that: the outer wrapping reinforcement layer (7) of the oblique leg is annularly arranged, when the outer wrapping reinforcement layer (7) of the oblique leg is constructed, firstly, steel bars are planted on the outer side of the oblique leg (6) to serve as a steel bar framework, then, the oblique steel bars (7-1) and the oblique stirrups (7-2) are bound, and finally, a template is erected on the outer side of the oblique leg (6) to pour concrete;
the outer wrapping reinforcing layer (8) of the main beam is in a horseshoe shape; when the construction of the girder outer wrapping reinforcing layer (8) is carried out, firstly, the bottom and two sides of the girder (5) are respectively planted with bars as a steel reinforcement framework, then longitudinal steel bars (8-1) and transverse stirrups (8-2) are bound, and finally, a template is erected outside the girder (5) to pour concrete.
8. The method for lifting and reinforcing the bearing capacity of the inclined leg rigid frame bridge according to claim 1, which is characterized in that: and step six, the girder is externally wrapped with the reinforcing layer (8) and the steel plate (11) to form a whole by a wet pasting method.
9. The method for lifting and reinforcing the bearing capacity of the inclined leg rigid frame bridge according to claim 1, which is characterized in that: and seventhly, when the steel pipe columns (9) and the jacks (10) are dismantled, sequentially relieving the pressure of the jacks (10) supported below the main beams to enable piston rods of the jacks (10) to retract and be separated from the main beams, and then synchronously dismantling the steel pipe columns (9).
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