CN111622133A - Bridge external pre-tightening force reinforcing system and mounting method thereof - Google Patents
Bridge external pre-tightening force reinforcing system and mounting method thereof Download PDFInfo
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- CN111622133A CN111622133A CN202010428716.7A CN202010428716A CN111622133A CN 111622133 A CN111622133 A CN 111622133A CN 202010428716 A CN202010428716 A CN 202010428716A CN 111622133 A CN111622133 A CN 111622133A
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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
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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Abstract
The invention provides a bridge external pre-tightening force reinforcing system which comprises an external rib (1), an anchoring device group (2) and a vibration damping device group (3), wherein the external rib (1) is arranged at the bottom end of a T beam (01) along the longitudinal direction of a bridge body, the anchoring device group (2) is arranged on the lower bottom surface of the beam end of the T beam (01), the vibration damping device is arranged on the lower bottom surface of the middle part of the T beam (01), the anchoring device group (2) anchors two ends of the external rib (1), and the working area of the vibration damping device acts on the radial direction of the external rib (1). The shock absorber is arranged in the external reinforcing system to reduce the vibration of the external cable when a train passes through; the linear distribution mode is adopted, the number of stranded wires can be effectively optimized while various static force and fatigue stress requirements are met, the structural and stress requirements of arranging the linear prestressed tendons at the bottom of the T-beam flange can be met, and the linear distribution mode has the advantages of being neat in outside, good in durability and high in stability.
Description
Technical Field
The invention relates to the field of beam body reinforcement, in particular to an external pretightening force reinforcing system.
Background
External prestress reinforcement is a better reinforcement method adopted at present. The principle of external prestress reinforcement is that an additional external cable is used for tensioning so as to improve the prestress level of an original structure, change the internal force distribution of the original structure, offset partial constant load stress, play a role in unloading and greatly improve the bearing capacity of the bridge. The existing reinforcing structure for reinforcing the box girder bottom plate by adopting the external prestressed tendons usually comprises structures such as an anchoring block, a steering block and the like.
However, in the external prestressed reinforcement structure, the external cables are arranged outside the main span body of the bearing structure, the prestressed reinforcement bundles only act with the beam body at the anchoring blocks and the steering blocks, the deformation between the external cables and the concrete on the section of the beam body is not coordinated, the local stress concentration phenomenon is easy to generate, and the prestressed reinforcement needs to steer, so that the prestressed loss can be generated. On the other hand, in the external prestressed reinforcement construction, the failure of any one of the anchoring block and the steering block will cause the failure of the whole reinforcement work: when the steering block and the anchoring block are of concrete structures, the steering block is easy to crack and damage under the action of force generated by the prestressed reinforcement bundles; when steel steering block and anchor block are adopted, the reasonable and effective connection between the steel block piece and the concrete is also a key problem, the connection is inconvenient, the connection effect is not easy to guarantee, and the final reinforcing effect is directly determined by the connection effect. In addition, the prestressed reinforcement bundles anchored by the existing external prestressed reinforcement anchoring structure are usually arranged on two sides of the beam body, and when the beam body is large in width, sufficient prestress is difficult to provide; if the prestressed reinforcement bundles are arranged at a position close to the middle of the box girder, a large transverse tension is generated.
The problem can be solved by an external pre-tightening force reinforcing system of the bridge.
Disclosure of Invention
The invention aims to solve the problems that the connection is inconvenient and the connection effect is not easy to guarantee when a steering block and an anchoring block are adopted in the prior art; the steering block is easy to crack and damage under the action of force generated by the prestressed reinforcement bundles, and the like, and the system for reinforcing the external pre-tightening force of the bridge and the installation method thereof are provided.
The invention provides a bridge external pre-tightening force reinforcing system which comprises an external rib, an anchoring device group and a vibration damping device group, wherein the external rib is arranged at the bottom end of a T-shaped beam along the longitudinal direction of a bridge body, the anchoring device group is arranged at the lower bottom surface of the end of the T-shaped beam, the vibration damping device group is arranged at the lower bottom surface of the middle part of the T-shaped beam, the anchoring device group anchors two ends of the external rib, and the working area of the vibration damping device group acts on the radial direction of the external rib.
The straight-line beam distribution is adopted, so that great convenience is brought to concrete pouring and prestressed steel beam tensioning; and simultaneously, the exerting effect of the prestress is improved.
According to the external pre-tightening force reinforcing system for the bridge, as a preferred mode, the anchoring device group comprises a first anchoring device and a second anchoring device, the first anchoring device is arranged at the front end part of the T-shaped beam, and the second anchoring device is arranged at the rear end part of the T-shaped beam.
The invention relates to a bridge external pre-tightening force reinforcing system, which is characterized in that a first anchoring device comprises a first anchoring steel plate and a plurality of first anchor bolts, the first anchoring steel plate is provided with through holes with the same number as the first anchor bolts, the first anchor bolts are perpendicular to the first anchoring steel plate, and the first anchoring steel plate is arranged at the bottom end of a T-shaped beam through the through holes; the first anchoring steel plate comprises a first anchoring steel plate body and a plurality of first anchoring supporting units, one side of the first anchoring steel plate body is tightly attached to the bottom surface of the T-shaped beam, the first anchoring supporting units are arranged on the other side of the first anchoring steel plate body, and the adjacent first anchoring supporting units are arranged in the same direction and in a staggered mode.
The invention relates to a bridge external pre-tightening force reinforcement system, which is characterized in that a first anchoring support unit comprises a first anchoring support rib plate, a second anchoring support rib plate, a first anchoring support panel, a first anchoring base plate and a first anchoring plate, wherein the first anchoring support rib plate and the second anchoring support rib plate are parallel to each other, the first anchoring support rib plate and the second anchoring support rib plate are arranged perpendicular to the surface of a first anchoring steel plate body, the first anchoring support panel is arranged perpendicular to the first anchoring support rib plate and the second anchoring support rib plate and perpendicular to the first anchoring steel plate body, a through hole is formed in the centroid position of the first anchoring support panel, the first anchoring base plate is arranged on the free surface of the first anchoring support panel, the first anchoring plate is arranged on the free surface of the first anchoring base plate, and the first anchoring base plate, the first anchoring plate and the through hole of the first anchoring support panel are coaxially arranged.
According to the system for reinforcing the external pre-tightening force of the bridge, as a preferred mode, the second anchoring device comprises a second anchoring steel plate and a plurality of second anchor bolts, the second anchoring steel plate is provided with through holes with the same number as the second anchor bolts, the second anchor bolts are perpendicular to the second anchoring steel plate, and the second anchoring steel plate is arranged at the bottom end of the T-shaped beam through the through holes; the second anchoring steel plate comprises a second anchoring steel plate body and a plurality of second anchoring supporting units, one side of the second anchoring steel plate body is tightly attached to the bottom surface of the T-shaped beam, the second anchoring supporting units are arranged on the other side of the second anchoring steel plate body, and the adjacent second anchoring supporting units are arranged in the same direction and in a staggered mode.
The invention relates to a bridge external pre-tightening force reinforcing system, which is characterized in that a second anchoring support unit comprises a third anchoring support rib plate, a fourth anchoring support rib plate, a second anchoring support panel, a second anchoring base plate and a second anchoring plate, wherein the third anchoring support rib plate and the fourth anchoring support rib plate are parallel to each other, the third anchoring support rib plate and the fourth anchoring support rib plate are arranged vertical to the plate surface of a second anchoring steel plate body, the second anchoring support panel is arranged vertical to the third anchoring support rib plate and the fourth anchoring support rib plate and vertical to the second anchoring steel plate body, a through hole is formed in the centroid position of the second anchoring support panel, the second anchoring base plate is arranged on the free surface of the second anchoring support panel, the second anchoring plate is arranged on the free surface of the second anchoring base plate, and the through holes of the second anchoring base plate, the second anchoring plate and the second anchoring support panel are coaxially arranged.
Adopt the anchor steel sheet to weld the anchor support element of good external prestressing force in advance for it is stronger to consolidate the system ease for simultaneously anchor support element and anchor steel sheet between common atress, the anchor steel sheet is pre-buried through the fluting, has better wholeness. The concentrated force generated by the external prestressed tendons of the tensioning body is uniformly distributed on the T-shaped beam through the anchoring steel plates and the anchoring units, so that the stress concentration phenomenon can be effectively reduced.
The invention relates to a bridge external pre-tightening force reinforcement system, which is characterized in that a vibration damping device group comprises at least one vibration damping device, the vibration damping device is arranged at the bottom end of a T-shaped beam, the vibration damping device comprises a vibration damping limiting steel plate, a plurality of vibration damping buckles and a plurality of vibration damping anchor bolts, the vibration damping limiting steel plate is in a long plate shape, the vibration damping limiting steel plate is transversely arranged at the bottom end of the T-shaped beam and does not contact with a beam body, the vibration damping limiting steel plate is parallel to the bottom surface of the T-shaped beam, the vibration damping buckles are in a U-shaped structure, two free ends of the vibration damping buckles are respectively arranged on the upper plate surface of the vibration damping limiting steel plate, the vibration damping buckles are arranged parallel to the longest edge of the vibration damping limiting steel plate, one end.
A shock absorber is arranged at a certain distance in the outer beam to reduce the vibration of the outer cable when the train passes through.
The invention relates to a method for installing a bridge external pre-tightening force reinforcing system, which comprises the following steps as an optimal mode:
s1, beam bottom drilling and grooving: grooving the anchoring areas at the two ends of the beam bottom, and drilling holes in the anchoring areas of the beam bottom and the middle part of the beam bottom;
s2, designing and installing an anchoring steel plate: respectively installing a first anchoring steel plate body and a second anchoring steel plate body at the grooving positions of the anchoring areas at the two ends of the beam bottom;
s3, anchoring and supporting units: fixing the first anchoring steel plate body to the bottom of the beam by using a first anchor bolt through drilling in the step S1, and fixing the second anchoring steel plate body to the bottom of the beam by using a second anchor bolt;
s4, stretching an external steel strand, and respectively anchoring two ends of an external rib to the first anchoring support unit and the second anchoring support unit;
s5, mounting a vibration damper: the method comprises the steps of installing a vibration damping device at the middle of an external beam, drilling a chemical anchor bolt at the bottom of a beam, installing a vibration damping limiting steel plate, fixing an external steel strand on the vibration damping limiting steel plate through a vibration damping buckle and a chloroprene rubber pad, and painting light gray polyurethane waterproof paint on the surface of a vibration damper after the installation is finished.
S6, anchor sealing treatment: before the anchor is sealed, the anchorage device, the anchor backing plate and the outer steel strand are coated with polyurethane waterproof paint, then steel templates are installed according to the spacing steel bar meshes, self-leveling type fine aggregate concrete is poured, and after maintenance is completed, the light gray polyurethane waterproof paint is coated on the surface of the sealed anchor concrete.
The invention has the following beneficial effects:
(1) a shock absorber is arranged to reduce the vibration of the external cable when the train passes through;
(2) by adopting a linear beam distribution mode, the number of stranded wires can be effectively optimized while various static force and fatigue stress requirements are met, and the requirements on the structure and stress of arranging a linear prestressed beam at the bottom of a T-shaped beam flange can be met;
(3) the system has simple structure, lower investment cost and simple and convenient construction;
(4) reinforce effectual and practical value height, can lay according to concrete needs, the fashioned reinforced structure of construction has outside neat, the durability is good, stability is high.
Drawings
FIG. 1 is a schematic diagram of a bridge in-vitro pre-tightening force reinforcing system;
FIG. 2 is a schematic view of an anchoring device set of a bridge in-vitro pre-tightening force reinforcing system;
FIG. 3 is a schematic view of a first anchoring device of a bridge external pre-tightening force reinforcing system;
FIG. 4 is a schematic view of a first anchoring steel plate of a bridge external pre-tightening force reinforcing system;
FIG. 5 is a schematic view of a first anchoring support unit of a bridge external pre-tightening force reinforcing system;
FIG. 6 is a schematic view of a second anchoring device of a bridge external pre-tightening force reinforcing system;
FIG. 7 is a schematic view of a second anchoring steel plate of a bridge external pre-tightening force reinforcing system;
FIG. 8 is a schematic view of a second anchoring support unit of a bridge external pre-tightening force reinforcement system;
FIG. 9 is a schematic view of a damping device set of a bridge in-vitro pre-tightening force reinforcing system;
FIG. 10 is a schematic view of a vibration damping device of a bridge external pre-tightening force reinforcing system;
FIG. 11 is a flowchart of a method for installing a bridge external pre-tightening force reinforcing system.
Reference numerals:
1. an external tendon; 2. an anchor device group; 21. a first anchoring device; 211. a first anchor steel plate; 2111. a first anchoring steel plate body; 2112. a first anchor support unit; 21121. a first anchor support rib; 21122. a second anchor support rib; 21123. a first anchor support panel; 21124. a first anchor backing plate; 21125. a first anchor plate; 212. a first anchor bolt; 22. a second anchoring device; 221. a second anchor steel plate; 2211. a second anchoring steel plate body; 2212. a second anchor support unit; 22121. a third anchor support rib; 22122. a fourth anchor support rib; 22123. a second anchor support panel; 22124. a second anchor backing plate; 22125. a second anchor plate; 222. a second anchor bolt; 3. a vibration damping device group; 31. a damping device; 311. a damping limiting steel plate; 312. a shock absorption buckle; 313. a shock-absorbing anchor bolt; 01. and a T-beam.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
As shown in fig. 1, an external pre-tightening force reinforcing system for a bridge comprises an external rib 1, an anchoring device group 2 and a vibration damping device group 3, wherein the external rib 1 is arranged at the bottom end of a T beam 01 along the longitudinal direction of the bridge, the anchoring device group 2 is arranged at the bottom surface of the bottom end of the T beam 01, the vibration damping device group 3 is arranged at the bottom surface of the middle part of the T beam 01, the anchoring device group 2 anchors two ends of the external rib 1, and a working area of the vibration damping device group 3 acts on the radial direction of the external rib 1.
As shown in fig. 2, the anchor device group 2 includes a first anchor device 21 and a second anchor device 22, the first anchor device 21 is disposed at the front end portion of the T-beam 01, and the second anchor device 22 is disposed at the rear end portion of the T-beam 01.
As shown in fig. 3, the first anchoring device 21 includes a first anchoring steel plate 211 and a plurality of first anchor bolts 212, the first anchoring steel plate 211 is provided with the same number of through holes as the first anchor bolts 212, the first anchor bolts 212 are arranged perpendicular to the first anchoring steel plate 211, and the first anchoring steel plate 211 is mounted at the bottom end of the T-beam 01 through the through holes.
As shown in fig. 4, the first anchoring steel plate 211 includes a first anchoring steel plate body 2111 and a plurality of first anchoring support units 2112, one side of the first anchoring steel plate body 2111 is tightly attached to the bottom surface of the T-beam 01, the first anchoring support units 2112 are disposed on the other side of the first anchoring steel plate body 2111, and the adjacent first anchoring support units 2112 are disposed in the same direction and in a staggered manner.
As shown in fig. 5, the first anchor supporting unit 2112 includes a first anchor supporting rib 21121, a second anchor supporting rib 21122, a first anchor supporting panel 21123, a first anchor backing plate 21124, and a first anchor plate 21125, the first anchor supporting rib 21121 and the second anchor supporting rib 21122 are parallel to each other, the first anchor supporting rib 21121 and the second anchor supporting rib 21122 are provided perpendicular to the first anchor steel plate body 2111, the first anchor supporting panel 21123 is provided perpendicular to the first anchor supporting rib 21121 and the second anchor supporting rib 21122 and provided perpendicular to the first anchor steel plate body 2111, a through hole is provided at a centroid position of the first anchor supporting panel 21123, the first anchor backing plate 21124 is provided on a free surface of the first anchor supporting panel 21123, the first anchor plate 21125 is provided on a free surface of the first anchor backing plate 21124, and the through hole of the first anchor backing plate 21124, the first anchor plate 21125, and the first anchor supporting panel 21123 are coaxially provided.
As shown in fig. 6, the second anchoring device 22 includes a second anchoring steel plate 221 and a plurality of second anchor bolts 222, the second anchoring steel plate 221 is provided with through holes having the same number as the second anchor bolts 222, the second anchor bolts 222 are arranged perpendicular to the second anchoring steel plate 221, and the second anchoring steel plate 221 is mounted at the bottom end of the T-beam 01 through the through holes.
As shown in fig. 7, the second anchor steel plate 221 includes a second anchor steel plate body 2211 and a plurality of second anchor support units 2212, one side of the second anchor steel plate body 2211 is closely attached to the bottom surface of the T-beam 01, the second anchor support units 2212 are disposed on the other side of the second anchor steel plate body 2211, and the adjacent second anchor support units 2212 are disposed in the same direction and in a staggered manner.
As shown in fig. 8, the second anchor support unit 2212 includes a third anchor support rib 22121, a fourth anchor support rib 22122, a second anchor support panel 22123, a second anchor plate 22124 and a second anchor plate 22125, the third anchor support rib 22121 and the fourth anchor support rib 22122 are parallel to each other, the third anchor support rib 22121 and the fourth anchor support rib 22122 are disposed perpendicular to the second anchor steel plate 2211, the second anchor support panel 22123 is disposed perpendicular to the third anchor support rib 22121 and the fourth anchor support rib 22122 and perpendicular to the second anchor steel plate 2211, a through hole is disposed at the centroid position of the second anchor support panel 22123, the second anchor plate 22124 is disposed on the free surface of the second anchor support panel 22123, the second anchor plate 22125 is disposed on the free surface of the second anchor plate 22124, and the second anchor plate 22125 and the through hole 22123 are coaxially disposed.
As shown in fig. 9, the damping device group 3 includes at least one damping device 31, and the damping device 31 is disposed at the bottom end of the T-beam 01.
As shown in fig. 10, damping device 31 includes shock-absorbing limiting steel plate 311, a plurality of shock-absorbing buckles 312 and a plurality of shock-absorbing anchor bolts 313, shock-absorbing limiting steel plate 311 is long plate-shaped, shock-absorbing limiting steel plate 311 transversely sets up in 01 bottom of T roof beam and contactless roof beam body, the parallel T roof beam 01 bottom surface of shock-absorbing limiting steel plate 311, shock-absorbing buckle 312 is the U-shaped structure, two free ends of shock-absorbing buckle 312 all set up face on shock-absorbing limiting steel plate 311, the longest limit of shock-absorbing buckle 312 parallel shock-absorbing limiting steel plate 311 sets up, shock-absorbing anchor bolt 313 one end sets up face on shock-absorbing limiting steel plate 311 perpendicularly, the other end sets up in the 01 bottom of T roof beam, external muscle 1 passes shock-absorbing.
As shown in fig. 11, a method for installing a bridge external pre-tightening force reinforcing system includes the following steps:
s1, beam bottom drilling and grooving: grooving the anchoring areas at the two ends of the beam bottom, and drilling holes in the anchoring areas of the beam bottom and the middle part of the beam bottom;
and (4) grooving the beam bottom anchoring area, wherein the grooving depth is 26-28 mm, the longitudinal length of the grooving is 1120mm, and the transverse width of the grooving is 780mm (equal to the width of the beam bottom). The hole is drilled in advance for implanting the M27 anchor bolt, the drilling depth is 235 +/-2 mm (counted from the bottom surface of the beam), and the diameter is
The M27 anchor bolt adopts a screw rod with a through long thread, the strength of the screw rod and the nut is 8.8 grade, and the surface is galvanized.
S2, designing and installing an anchoring steel plate: the first anchoring steel plate body 2111 and the second anchoring steel plate body 2211 are respectively arranged at the anchoring area slots at the two ends of the beam bottom;
the anchoring steel plate bodies of the first anchoring steel plate 211 and the second anchoring steel plate 221 are respectively located at the large mileage part and the small mileage part of the T-shaped beam to be reinforced, and the anchoring steel plate bodies are divided into two tensioning ends designed to meet the space requirements of single-end tensioning and staggered anchoring of the external steel strand. The thickness of the anchoring steel plate is 25mm, the longitudinal bridge direction is 1100mm, the transverse bridge direction is 780mm, Q345 steel is adopted, and the surface is plated withZinc treatment, setting of the position of the embedded bar
Holes are reserved.
S3, anchoring and supporting units: drilling a hole through step S1 to fix the first anchor steel plate body 2111 to the bottom of the beam with the first anchor bolt 212, and fixing the second anchor steel plate body 2211 to the bottom of the beam with the second anchor bolt 222;
and Q345 steel is adopted to indicate galvanization, and groove welding is performed among the anchoring support panel, the rib plate and the anchoring steel plate. Each anchoring steel plate is provided with 6 anchoring support units which respectively anchor 6 external steel strand bundles.
S4, stretching the external steel strand, and respectively anchoring two ends of an external bar to the first anchoring support unit 2112 and the second anchoring support unit 2212;
s5, mounting a vibration damper: and (3) installing vibration reduction devices (one for each large mileage and small mileage) at 4m of the span of the external bundle, ensuring that the free length of the external bundle stranded wire is not more than 8m, and installing the vibration reduction devices after the external bundle is tensioned. Drilling holes at the bottom of the beam
Implanting M16 chemical anchor bolt (the anchor bolt adopts a screw rod with a through long thread, the strength of the screw rod and a nut is 6.8 grade, the surface is galvanized), installing a vibration reduction limiting steel plate (the longitudinal direction is 100mm, the transverse direction is 780mm, the thickness is 16mm, Q235 steel, the surface is galvanized), and then passing through
The U-shaped button (stainless steel type) and the chloroprene rubber pad fix the external steel strand on the vibration reduction limiting steel plate. And after the installation is finished, brushing a light gray polyurethane waterproof coating on the surface of the shock absorber.
S6, anchor sealing treatment: before the anchor is sealed, the anchorage device, the anchor backing plate and the outer leakage steel strand are coated with polyurethane waterproof paint, and then the polyurethane waterproof paint is arranged according to the distance
Reinforcing mesh, installing steel form and pouring self-leveling fine-stone concrete (strength grade)C60, the particle size of the pebbles is 5-10 mm), the longitudinal length of the pouring area is 1150mm, the transverse direction is 780mm, and the thickness is 120mm from the bottom of the beam. And after the maintenance is finished, coating a light gray polyurethane waterproof coating on the surface of the anchor sealing concrete.
This embodiment adopts sharp cloth bundle form, adopts 2300MPa level ultrahigh strength prestressing force steel strand wires and supporting anchor system, when satisfying each item static and fatigue atress requirement, can effectively optimize stranded conductor quantity, can satisfy arranges sharp prestressing force bundle in the structure and the atress requirement of T beam flange bottom. The centers of the external beam anchoring areas of the two bridge bodies are positioned at the beam bottom 4.3m away from the beam end.
In order to meet the anti-corrosion requirement, a single ultra-high-strength epoxy coating steel strand (15.2mm specification, 2300MPa level filling type epoxy coating prestress steel strand + PE sleeve) with a PE sleeve is adopted for the external bundle, and meanwhile, a single-hole anchoring device with a sealing and protecting device is adopted for the anchoring end. Possesses good atress and corrosion resisting property, simultaneously can convenient construction, convenient later stage change.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The utility model provides a bridge external prestressing force system of consolidating which characterized in that: including external muscle (1), anchor group (2) and damping device group (3), external muscle (1) is set up in T roof beam (01) bottom along the pontic longitudinal direction, anchor group (2) set up in bottom surface under T roof beam (01) beam-ends, damping device group (3) set up in bottom surface under T roof beam (01) middle part, anchor group (2) anchor external muscle (1) both ends, damping device group (3) work area acts on external muscle (1) radial direction.
2. The system of claim 1, wherein: the anchoring device group (2) comprises a first anchoring device (21) and a second anchoring device (22), the first anchoring device (21) is arranged at the front end part of the T-shaped beam (01), and the second anchoring device (22) is arranged at the rear end part of the T-shaped beam (01).
3. The bridge in-vitro pre-tightening force reinforcing system according to claim 2, characterized in that: the first anchoring device (21) comprises a first anchoring steel plate (211) and a plurality of first anchor bolts (212), the number of through holes in the first anchoring steel plate (211) is the same as that of the first anchor bolts (212), the first anchor bolts (212) are perpendicular to the first anchoring steel plate (211), and the first anchoring steel plate (211) is mounted at the bottom end of the T-shaped beam (01) through the through holes; the first anchoring steel plate (211) comprises a first anchoring steel plate body (2111) and a plurality of first anchoring support units (2112), wherein one side of the first anchoring steel plate body (2111) is tightly attached to the bottom surface of the T beam (01), the first anchoring support units (2112) are arranged on the other side of the first anchoring steel plate body (2111), and the first anchoring support units (2112) are arranged in the same direction and in a staggered mode.
4. The bridge in-vitro pre-tightening force reinforcing system according to claim 3, characterized in that: the first anchor supporting unit (2112) includes a first anchor supporting rib (21121), a second anchor supporting rib (21122), a first anchor supporting panel (21123), a first anchor backing plate (21124), and a first anchor plate (21125), the first anchor supporting rib (21121) and the second anchor supporting rib (21122) are parallel to each other, the first anchor supporting rib (21121) and the second anchor supporting rib (21122) are provided perpendicularly to the first anchor steel plate body (2111) plate surface, the first anchor supporting panel (21123) is provided perpendicularly to the first anchor supporting rib (21121) and the second anchor supporting rib (21122) and perpendicularly to the first anchor steel plate body (2111), a through hole is provided at a centroid position of the first anchor supporting panel (21123), the first anchor backing plate (21124) is provided to a free surface of the first anchor supporting panel (21123), the first anchor plate (21125) is arranged on a free surface of the first anchor backing plate (21124), and the through holes of the first anchor backing plate (21124), the first anchor plate (21125) and the first anchor supporting panel (21123) are coaxially arranged.
5. The bridge in-vitro pre-tightening force reinforcing system according to claim 2, characterized in that: the second anchoring device (22) comprises a second anchoring steel plate (221) and a plurality of second anchor bolts (222), the number of through holes in the second anchoring steel plate (221) is the same as that of the second anchor bolts (222), the second anchor bolts (222) are perpendicular to the second anchoring steel plate (221), and the second anchoring steel plate (221) is mounted at the bottom end of the T-shaped beam (01) through the through holes; the second anchoring steel plate (221) comprises a second anchoring steel plate body (2211) and a plurality of second anchoring support units (2212), one side of the second anchoring steel plate body (2211) is tightly attached to the bottom surface of the T beam (01), the second anchoring support units (2212) are arranged on the other side of the second anchoring steel plate body (2211), and the second anchoring support units (2212) are arranged in the same direction and in a staggered mode.
6. The bridge in-vitro pre-tightening force reinforcing system according to claim 5, wherein: the second anchor supporting unit (2212) includes a third anchor supporting rib plate (22121), a fourth anchor supporting rib plate (22122), a second anchor supporting panel (22123), a second anchor plate (22124) and a second anchor plate (22125), the third anchor supporting rib plate (22121) and the fourth anchor supporting rib plate (22122) are parallel to each other, the third anchor supporting rib plate (22121) and the fourth anchor supporting rib plate (22122) are disposed perpendicular to the second anchor steel plate body (2211) plate surface, the second anchor supporting panel (22123) is disposed perpendicular to the third anchor supporting rib plate (22121) and the fourth anchor supporting rib plate (22122) and perpendicular to the second anchor steel plate body (2211), a centroid position of the second anchor supporting panel (22123) is provided with a through hole, the second anchor plate (22124) is disposed on the second anchor supporting panel (22123) free supporting surface, the second anchor plate (22125) is arranged on the free surface of the second anchor plate (22124), and the through holes of the second anchor plate (22124), the second anchor plate (22125) and the second anchor support panel (22123) are coaxially arranged.
7. The bridge in-vitro pre-tightening force reinforcing system according to claim 1, characterized in that: the damping device group (3) comprises at least one damping device (31), the damping device (31) is arranged at the bottom end of the T beam (01), the damping device (31) comprises a damping limiting steel plate (311), a plurality of damping buckles (312) and a plurality of damping anchor bolts (313), the damping limiting steel plate (311) is in a long plate shape, the damping limiting steel plate (311) is transversely arranged at the bottom end of the T beam (01) and does not contact with the beam body, the damping limiting steel plate (311) is parallel to the bottom surface of the T beam (01), the damping buckles (312) are in a U-shaped structure, two free ends of the damping buckles (312) are arranged on the upper plate surface of the damping limiting steel plate (311), the damping buckles (312) are parallel to the longest edge of the damping limiting steel plate (311), one end of the damping anchor bolts (313) is perpendicularly arranged on the damping limiting steel plate (311), the other end of the shock absorption buckle is arranged at the bottom end of the T-shaped beam (01), and the external rib (1) penetrates through the shock absorption buckle (312), the upper surface of the shock absorption buckle (312) is in contact with the inner surface of the U-shaped bent part of the shock absorption buckle (312).
8. The method for installing the bridge external pre-tightening force reinforcing system according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:
s1, beam bottom drilling and grooving: grooving the anchoring areas at the two ends of the beam bottom, and drilling holes in the anchoring areas of the beam bottom and the middle part of the beam bottom;
s2, designing and installing an anchoring steel plate: respectively installing the first anchoring steel plate body (2111) and the second anchoring steel plate body (2211) at the anchoring area slots at two ends of a beam bottom;
s3, anchoring and supporting units: fixing the first anchor steel plate body (2111) to the bottom of the girder by the first anchor bolt (212) and fixing the second anchor steel plate body (2211) to the bottom of the girder by the second anchor bolt (222) by drilling at step S1;
s4, tensioning the external steel strand, and respectively anchoring two ends of the external bar (1) to the first anchoring support unit (2112) and the second anchoring support unit (2212);
s5, mounting a vibration damper: installing a vibration damping device at the middle of the external beam, drilling a chemical anchor bolt at the bottom of the beam, installing a vibration damping limiting steel plate, fixing an external steel strand on the vibration damping limiting steel plate through a vibration damping buckle (312) and a chloroprene rubber pad, and brushing a light gray polyurethane waterproof coating on the surface of the vibration damper after the installation is finished;
s6, anchor sealing treatment: before the anchor is sealed, the anchorage device, the anchor backing plate and the outer steel strand are coated with polyurethane waterproof paint, then steel templates are installed according to the spacing steel bar meshes, self-leveling type fine aggregate concrete is poured, and after maintenance is completed, the light gray polyurethane waterproof paint is coated on the surface of the sealed anchor concrete.
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