CN215857301U - External prestress reinforcing structure of assembled continuous T-shaped beam or I-shaped beam - Google Patents

Abstract

The utility model discloses an external prestress reinforcing structure of an assembled continuous T beam or an I-beam, which comprises anchoring blocks arranged at two ends of the integrated T beam or the I-beam, a plurality of positive bending moment zone steering blocks arranged at the bottom of a middle-span area beam of each span T beam or the I-beam, a negative bending moment zone steering block or a negative bending moment zone side beam outer side steering block arranged at the top of a pier, and an external beam sleeved in the anchoring blocks, the positive bending moment zone steering blocks, the negative bending moment zone steering blocks and the negative bending moment zone side beam outer side steering blocks, wherein the external beam penetrates through the anchoring blocks, the positive bending moment zone steering blocks and the negative bending moment zone steering blocks or the negative bending moment zone side beam outer side steering blocks, and is anchored on the anchoring blocks at two ends through an anchoring device. The utility model can effectively shorten the construction period of reinforcement, and can simultaneously weaken the influence on bridge deck traffic due to the shortened construction period, most importantly, the reinforcement structure can greatly improve the reinforcement effect, and has good popularization value.

Description

External prestress reinforcing structure of assembled continuous T-shaped beam or I-shaped beam

Technical Field

The utility model relates to a reinforcing structure, in particular to an external prestress reinforcing structure of an assembled continuous T-shaped beam or an I-shaped beam, and belongs to the technical field of bridge reinforcement.

Background

Generally, according to the relevant regulations of highway bridges, a fully prestressed or partially prestressed concrete structure does not allow vertical or oblique cracks to appear, and if the cracks appear, effective measures must be taken for reinforcing the bridge. At present, for the condition that the beam body pressure stress reserve is insufficient to cause cracking, the most suitable and common reinforced structure is an external prestress reinforced structure, but the external beam reinforced structure of the assembly type continuous T beam or I-beam which is seen at present is generally the following three conditions:

1. when the transverse bridge is reinforced, which girder is cracked only reinforces the girder, and the girder which is not cracked is not reinforced;

2. all T-shaped beams of the whole span in the transverse bridge direction are reinforced, but when the longitudinal bridge direction is reinforced, the span is only reinforced when the span is cracked, and the span without cracking is not reinforced;

3. if all T-shaped beams need to be reinforced, the design is that each span is separately reinforced, namely, the next span is reinforced after the reinforcement of one span is finished, and the external beam of each span is disconnected and arranged without connection.

The common reinforcing structures in the prior stage have defects in different degrees:

1. to the cross bridge when consolidating, which piece roof beam fracture only strengthens the fracture roof beam, does not have the condition that the fracture roof beam does not carry out the reinforcement, and the defect of existence is: because the assembled beam bridge cross bridge in the operation stage is connected into a whole to a cast-in-place continuous section which passes through a wing plate wet joint, a cross partition plate and a pier top, if only a cracked beam is reinforced, after the external beam of the cracked beam is tensioned, the external beam tensioning force of other beams on the cracked beam is greatly shared, the boundary beam reaches 30% -40%, and even the middle beam reaches more than 50%. If the reinforcing beam is a middle beam, after the outer beam of the cracked middle beam is tensioned, the compressive deformation of the reinforcing middle beam is generated, the deformation can be transmitted to the unreinforced beam through the transverse connection, the transverse connection is longitudinally sheared, particularly, the diaphragm is easy to crack, and the diaphragm which is closer to the reinforcing middle beam cracks more obviously.

2. All T roof beams of whole stride are all consolidated to "horizontal bridge, but when longitudinal bridge is consolidated to the reinforcement, where strides the fracture and only consolidates this stride, does not have the fracture to stride and does not consolidate" the condition, the defect that exists is: because the longitudinal bridge of the assembled beam bridge in the operation stage is connected into a whole through the pier top cast-in-place continuous section, if only the cracked span is reinforced, after the external beam of the cracked span is tensioned, the un-cracked span causes the bridge to freely contract in the longitudinal bridge direction due to the support friction and the like, and the actual un-reinforced span is tensioned due to the external beam tensioning of the reinforced span. Meanwhile, because the longitudinal bridge direction is connected into a whole, when the cracked span is tensioned, a linkage effect is generated on other span deformations, for example, a 3-span continuous structure is taken as an example, when an edge span is tensioned, the edge span supplies power, but the mid-span generates downwarping, the bottom of the mid-span T-shaped beam is tensioned instead, and cracking or cracks of the mid-span T-shaped beam are possibly aggravated. The effect is more pronounced at bridge spans that are closer to the tension span.

3. Aiming at the situation that all T-shaped beams need to be reinforced, the T-shaped beams are designed to be separately reinforced, namely, after one span is reinforced, the next span is reinforced, and the external beam of each span is disconnected and arranged without connection. "there are drawbacks: firstly, each span is separately reinforced, and both ends of each span need to be provided with anchoring blocks, no matter the steel structure anchoring block or the concrete structure anchoring block, the beam end needs to be drilled with steel bars or implanted with anchor bolts for construction or fixing the anchoring block, and the T-beam structure is greatly damaged due to the arrangement of the anchoring blocks, and the construction period is long; secondly, each span is separately constructed, because the longitudinal bridge direction of the bridge structure is connected into a whole through the pier top cast-in-place continuous section, after the construction span is tensioned, the span can be arched upwards, adjacent spans can be downwarped, the tensile stress of the bottom of the adjacent-span T-shaped beam is increased, and if the adjacent spans are not tensioned, the adjacent-span T-shaped beam can be cracked or cracked.

Therefore, the key point for solving the technical problems is to develop a safe and reliable assembled T-beam or I-beam reinforcing structure with good reinforcing effect.

Disclosure of Invention

Aiming at various defects and shortcomings in the background technology, the utility model is improved and innovated, and aims to provide a fabricated T-beam or I-beam reinforcing structure which is good in reinforcing effect, safe and reliable, and capable of accelerating the working progress, weakening the influence on bridge deck traffic and shortening the reinforcing construction period.

The utility model also aims to simultaneously stretch the external bundles of the reinforced structure, so as to avoid the adverse effect on the temporary span beam body caused by single-span independent construction.

In order to solve the above problems and achieve the above objects, the external prestressed reinforcement structure of an assembled continuous T-beam or i-beam according to the present invention is implemented by using the following design structure and the following technical solutions:

an external prestress reinforcing structure of an assembled continuous T beam or an I-beam comprises anchoring blocks (2) arranged at two ends of the integral T beam or the I-beam (1), a plurality of positive bending moment zone steering blocks (3) arranged at the bottom of a middle-span area beam of each span T beam or the I-beam (1), a negative bending moment zone steering block (4) or a negative bending moment zone side beam outer side steering block (5) arranged at the top of a pier (8), and an external beam (6) sleeved in the anchoring blocks (2), the positive bending moment zone steering blocks (3), the negative bending moment zone steering block (4) and the negative bending moment zone side beam outer side steering block (5), wherein the external beam (6) passes through the anchoring block (2), the positive bending moment zone steering block (3), the negative bending moment zone steering block (4) or the negative bending moment zone side beam outer side steering block (5), and the external beam (6) is anchored on the anchoring blocks (2) at the two ends through an anchoring device (7).

As another preferable technical scheme of the utility model, the anchoring blocks (2) are arranged at the simply-supported end of the side span, the connecting ends of the mid-span T beam or I-beam (1) and the side-span T beam or I-beam (1) are not arranged, wherein the anchoring blocks (2) are symmetrically and fixedly connected to two sides of the T beam or I-beam (1) at the end part.

As the preferable technical scheme of the utility model, the anchoring blocks (2) are symmetrically arranged at two ends of the integrated T-shaped beam or I-shaped beam (1), and the anchoring blocks (2) are not arranged at the connecting ends of the mid-span T-shaped beam or I-shaped beam (1) and the side-span T-shaped beam or I-shaped beam (1).

As the preferable technical scheme of the utility model, at least two positive bending moment area steering blocks (3) are arranged at the bottom of the span middle area beam of each span T beam or I-shaped beam (1).

As a further preferable technical scheme of the utility model, the positive bending moment zone steering blocks (3) are arranged at the bottom of the span-middle area beam of the T-shaped beam or the I-shaped beam (1) at equal intervals or unequal intervals.

As a further preferable technical solution of the present invention, the bending moment region turning block (3) is entirely U-shaped or Contraband-shaped, and a turning pipe is provided inside both sides of the bending moment region turning block (3).

As a still further preferable technical solution of the present invention, the hogging moment region turning block (4) is fixedly connected to the outer side of the large and small piles of the cast-in-place continuous section of the T beam or the i-beam above the bridge pier (8), wherein a turning pipe is arranged on the hogging moment region turning block (4), and the turning pipe is located inside the hogging moment region turning block (4).

As a still further preferable technical scheme of the utility model, the hogging moment area side beam outer side steering block (5) is fixedly connected above the bridge pier (8) and is positioned at the continuous section outside the integrated T beam or I-beam (1), a steering pipe is arranged on the hogging moment area side beam outer side steering block (5), and the steering pipe is positioned inside the hogging moment area side beam outer side steering block (5).

As a still further preferable technical scheme of the utility model, an injection molding layer, an anti-rust layer, a waterproof layer and a warning layer are sequentially arranged on the outer surfaces of the T-shaped beam or the I-shaped beam (1), the anchoring block (2), the positive bending moment area steering block (3), the negative bending moment area steering block (4), the negative bending moment area side beam outer side steering block (5), the outer beam (6), the anchoring device (7) and the bridge pier (8) from inside to outside, and fluorescent powder is coated on the warning layer.

As a still further preferable technical solution of the present invention, a polymer wear-resistant material is injection-molded on the injection-molded layer; the anti-rust layer comprises epoxy zinc-rich primer, chlorinated rubber finish paint and epoxy mica iron intermediate paint positioned between the epoxy zinc-rich primer and the chlorinated rubber finish paint; the waterproof layer is polyurethane waterproof paint; the warning layer is a reflective warning tape or a reflective color film or reflective paint with single color or multiple colors mixed with each other.

The working principle is as follows: when the device works, firstly, workers handle common and common diseases of the original beam, such as crack sealing, damage repairing and the like. After repairing common diseases, performing external prestress reinforcement on the structure, and integrally reinforcing the integral bridge with an external beam (6) only by arranging an anchoring block (2) at the simply supported end of the T-shaped beam or the I-shaped beam (1), arranging a positive bending moment area steering block (3) at the bottom of the span-middle area of each T-shaped beam or the I-shaped beam (1), arranging a negative bending moment area steering block (4) at the cast-in-place continuous section at the large and small pile number sides of the T-shaped beam or the I-shaped beam (1) above a bridge pier (8), arranging a negative bending moment area side beam external steering block (5) at the cast-in-place continuous section at the outer side of the T-shaped beam or the I-shaped beam (1) above the bridge pier (8), sequentially penetrating the external beam (6) in the longitudinal direction for tensioning after the components are arranged, and anchoring the external beam (6) on the anchoring block (2) at the simply supported end of the T-shaped beam or the I-shaped beam (1) through an anchoring device (7), the external beam is arranged in a through length, thereby realizing the purpose of reinforcing the integrated T-shaped beam or the I-shaped beam (1).

In the whole implementation operation process, an anchoring block (2) is arranged at a simply supported end of a side span, 2 positive bending moment area steering blocks (3) are arranged at proper positions of the middle area of each T-shaped beam or each I-shaped beam span, a negative bending moment area steering block (4) and a negative bending moment area side beam outer side steering block (5) are arranged at a cast-in-place continuous section of the top of a pier (8), an external beam (6) penetrates through the anchoring block (2), the positive bending moment area steering block (3), the negative bending moment area steering block (4) or the negative bending moment area side beam outer side steering block (5), the external beam (6) is anchored on the anchoring blocks (2) at two ends through an anchoring device (7), and finally, synchronous tensioning is required when all the external beams (6) on the T-shaped beam or the I-shaped beam are tensioned.

Compared with the prior art, the utility model has the following beneficial effects:

1. the utility model can effectively shorten the construction period of reinforcement, and can simultaneously weaken the influence on bridge deck traffic due to the shortened construction period;

2. the number of the anchoring blocks is greatly reduced, so that a large number of holes are prevented from being drilled and bar-planted or anchor bolts are prevented from being planted at the beam end, and the damage to the prestressed steel stranded wires in the beam end body is greatly reduced;

3. according to the utility model, the external bundles of the whole body are simultaneously tensioned, so that the adverse influence on the temporary span beam body caused by single-span independent construction is avoided;

4. through modeling calculation, compared with single-span separate reinforcement, the integral reinforcement structure proposed by the utility model is relatively reinforced in a single-span separate manner in the same external beam arrangement form under the same tensile force (359.4KN), and the reinforcement calculation effect realizes that the bottom compressive stress reserve of the side-span beam is increased by 12.1% and the bottom compressive stress reserve of the mid-span beam is increased by 83.3%; on the other hand, the increase of the beam top pressure stress reserve of the hogging moment area of the bridge pier top by 81.8 percent is realized;

5. the anti-rust layer and the waterproof layer are coated on the outer part of the device, so that the service life of the whole device is prolonged while rust is prevented, the environment is protected, resources are saved, meanwhile, the self-luminous fluorescent material is coated on the outer part of the device, the position of the device can be clearly marked in a night or dark room and underground construction environment, the effect of safety prompt can be effectively achieved, the conspicuity is improved, people can easily distinguish the device, and the safety in construction and life is improved.

Drawings

Embodiments of the utility model are described in further detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic view of a reinforcement structure of the present invention;

FIG. 2 is a schematic illustration of a center sill elevation of the present invention;

FIG. 3 is a schematic elevational view of the edge beam of the present invention;

FIG. 4 is a top view of the present invention;

FIG. 5 is a partially enlarged view of the plane A-A of FIG. 4;

FIG. 6 is a partially enlarged view of the plane B-B of FIG. 5;

FIG. 7 is a schematic view of a portion of the surface C-C of FIG. 4;

FIG. 8 is a partially enlarged schematic view of the surface D-D of FIG. 7;

FIG. 9 is a state diagram of the use of the present invention;

wherein, the reference numbers in the figures: the method comprises the following steps of 1-T beam or I-beam, 2-anchoring block, 3-positive bending moment zone steering block, 4-negative bending moment zone steering block, 5-negative bending moment zone boundary beam outer side steering block, 6-external beam, 7-anchoring device and 8-bridge pier.

Detailed Description

In order to make the technical means, the inventive features, the achievement purposes and the effects of the present invention easy to understand, the technical solutions of the present invention are further described in detail with reference to the drawings and the detailed description below, and it is to be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The external prestress reinforcing structure of the assembled continuous T beam or the I-beam shown in the attached drawings comprises anchoring blocks 2 arranged at two ends of an integral T beam or the I-beam 1, a plurality of positive bending moment zone steering blocks 3 arranged at the bottom of a span middle area beam of each span T beam or the I-beam 1, a negative bending moment zone steering block 4 or a negative bending moment zone side beam external steering block 5 arranged at the top of a pier 8, and an external beam 6 penetrating and sleeved in the anchoring blocks 2, the positive bending moment zone steering blocks 3, the negative bending moment zone steering blocks 4 and the negative bending moment zone side beam external steering block 5, wherein the external beam 6 penetrates through the anchoring blocks 2, the positive bending moment zone steering blocks 3, the negative bending moment zone steering blocks 4 or the negative bending moment zone side beam external steering blocks 5, and is anchored on the anchoring blocks 2 at two ends through an anchoring device 7.

Further, the anchoring blocks 2 are arranged at the simply supported end of the side span, the connecting ends of the mid-span T-shaped beam or I-shaped beam 1 and the side-span T-shaped beam or I-shaped beam 1 are not arranged, and the anchoring blocks 2 are symmetrically and fixedly connected to two sides of the T-shaped beam or I-shaped beam 1 at the end parts.

Further, the anchoring blocks 2 are symmetrically arranged at two ends of the integrated T-shaped beam or I-shaped beam 1, and the anchoring blocks 2 are not arranged at the connecting ends of the mid-span T-shaped beam or I-shaped beam 1 and the side-span T-shaped beam or I-shaped beam 1.

Furthermore, at least two positive bending moment zone steering blocks 3 are arranged at the bottom of the span middle area of each span T beam or I-shaped beam 1.

Specifically, the steering blocks 3 in the positive bending moment area are arranged at the bottom of the span middle area beam of the T-shaped beam or the I-shaped beam 1 at equal intervals or unequal intervals.

More specifically, the steering block 3 in the positive bending moment region is integrally in a "U" shape or "Contraband" shape, and steering pipes are arranged inside two sides of the steering block 3 in the positive bending moment region.

Furthermore, a hogging moment area steering block 4 is fixedly connected to the outer side of a large pile and a small pile of a T-shaped beam or an I-shaped beam cast-in-place continuous section above the bridge pier 8, wherein a steering pipe is arranged on the hogging moment area steering block 4 and is positioned inside the hogging moment area steering block 4.

In the utility model, the steering block 4 in the hogging moment area is drilled in a cast-in-place continuous section of the main beam above a bridge pier 8 and then is implanted with a steering pipe, and then concrete is implanted on two sides of the cast-in-place section according to the designed length of the steering block in the hogging moment area and is formed by pouring concrete on two side edge beams of the integrated T beam or I-beam.

Furthermore, a hogging moment area side beam outer side steering block 5 is fixedly connected above the bridge pier 8 and located at the continuous section outside the integral T-shaped beam or the I-shaped beam 1, a steering pipe is arranged on the hogging moment area side beam outer side steering block 5, and the steering pipe is located inside the hogging moment area side beam outer side steering block 5.

In the utility model, the anchoring block 2, the steering block 3 in the positive bending moment area and the steering block 5 outside the side beam in the negative bending moment area can be designed into a concrete structure or a steel structure, and the steering block 4 in the negative bending moment area needs to drill holes in a cast-in-place continuous section to install steering pipes, so that the new and old structures are connected tightly, the same material, namely the concrete structure, is suggested to be designed.

Further, an injection molding layer, an anti-rust layer, a waterproof layer and a warning layer are sequentially arranged on the outer surfaces of the T-shaped beam or I-shaped beam 1, the anchoring block 2, the positive bending moment area steering block 3, the negative bending moment area steering block 4, the negative bending moment area side beam outer side steering block 5, the outer beam 6, the anchoring device 7 and the bridge pier 8 from inside to outside, and fluorescent powder is coated on the warning layer.

Specifically, a high-molecular wear-resistant material is injected on the injection molding layer; the anti-rust layer comprises epoxy zinc-rich primer, chlorinated rubber finish paint and epoxy mica iron intermediate paint positioned between the epoxy zinc-rich primer and the chlorinated rubber finish paint; the waterproof layer is polyurethane waterproof paint; the warning layer is a reflective warning tape or a reflective color film or reflective paint with single color or multiple colors mixed with each other.

To sum up, the more specific embodiments of the present invention are:

when the device works, firstly, workers handle common and common diseases of the original beam, such as crack sealing, damage repairing and the like. After the repair of common diseases is finished, the structure is reinforced by external prestress, and because the utility model integrally reinforces the external beam 6 of the integral bridge, the anchoring block 2 is only needed to be arranged at the simply-supported end part of the T-shaped beam or the I-shaped beam 1, a positive bending moment zone steering block 3 is arranged at the bottom of the midspan area of each T beam or I-beam 1, a negative bending moment zone steering block 4 is arranged at the cast-in-place continuous section at the large and small pile sides of the T beam or I-beam 1 above the bridge pier 8, a hogging moment area side beam outer side steering block 5 is arranged at the cast-in-place continuous section at the outer side of the T beam or the I-beam 1 above the bridge pier 8, after the components are arranged, the external beam 6 penetrates into the longitudinal bridge direction in sequence to be tensioned, the external beam 6 is anchored on the anchoring block 2 at the simply supported end of the T-shaped beam or the I-shaped beam 1 through the anchoring device 7, and the external beam is arranged in a whole through length mode, so that the aim of reinforcing the integrated T-shaped beam or the I-shaped beam 1 is fulfilled.

In the whole implementation operation process, an anchoring block 2 is arranged at the simply supported end of the side span, 2 positive bending moment area steering blocks 3 are arranged at proper positions of the middle area of each T-shaped beam or the work beam span, a negative bending moment area steering block 4 and a negative bending moment area side beam outer side steering block 5 are arranged at the cast-in-place continuous section of the top of a pier 8, an external beam 6 penetrates through the anchoring block 2, the positive bending moment area steering block 3, the negative bending moment area steering block 4 or the negative bending moment area side beam outer side steering block 5, the external beam 6 is anchored on the anchoring blocks 2 at two ends through an anchoring device 7, and finally synchronous tensioning is required when each external beam 6 on the integral T-shaped beam or the work beam is tensioned.

Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in other forms, and any person skilled in the art may change or modify the technical content disclosed above into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims (10)

1. The utility model provides an external prestressing force reinforced structure of continuous T roof beam of assembled or I-beam which characterized in that: the reinforcing structure comprises anchoring blocks (2) arranged at two ends of an integrated T beam or an I-beam (1), a plurality of positive bending moment area steering blocks (3) arranged at the bottom of a middle area beam of each span of the T beam or the I-beam (1), negative bending moment area steering blocks (4) or negative bending moment area side beam outer side steering blocks (5) arranged at the top of a pier (8), and external bundles (6) sleeved in the anchoring blocks (2), the positive bending moment area steering blocks (3), the negative bending moment area steering blocks (4) and the negative bending moment area side beam outer side steering blocks (5), wherein the external bundles (6) penetrate through the anchoring blocks (2), the positive bending moment area steering blocks (3), the negative bending moment area steering blocks (4) or the negative bending moment area side beam outer side steering blocks (5), and are anchored on the anchoring blocks (2) at two ends through an anchoring device (7).

2. An external prestressed reinforcement structure of assembled continuous T-beam or I-beam according to claim 1, characterized in that: the anchoring blocks (2) are arranged at the simply supported end of the side span, the connecting ends of the mid-span T-shaped beam or the I-shaped beam (1) and the side-span T-shaped beam or the I-shaped beam (1) are not arranged, and the anchoring blocks (2) are symmetrically and fixedly connected to two sides of the T-shaped beam or the I-shaped beam (1) at the end parts.

3. An external prestressed reinforcement structure of assembled continuous T-beam or I-beam according to claim 1, characterized in that: the anchoring blocks (2) are symmetrically arranged at two ends of the integrated T-shaped beam or I-shaped beam (1), and the anchoring blocks (2) are not arranged at the connecting ends of the mid-span T-shaped beam or I-shaped beam (1) and the side-span T-shaped beam or I-shaped beam (1).

4. An external prestressed reinforcement structure of assembled continuous T-beam or I-beam according to claim 1, characterized in that: at least two positive bending moment area steering blocks (3) are arranged at the bottom of the span middle area of each span T beam or I-shaped beam (1).

5. An external prestressed reinforcement structure of assembled continuous T-beam or I-beam according to claim 3, characterized in that: the positive bending moment area steering blocks (3) are arranged at the bottom of the span middle area beam of the T-shaped beam or the I-shaped beam (1) at equal intervals or unequal intervals.

6. The external prestress reinforcing structure of the assembled continuous T-shaped beam or the I-shaped beam according to claim 4, wherein: the positive bending moment area steering block (3) is U-shaped or Contraband-shaped as a whole, and steering pipes are arranged inside two sides of the positive bending moment area steering block (3).

7. An external prestressed reinforcement structure of assembled continuous T-beam or I-beam according to claim 1, characterized in that: the hogging moment area steering block (4) is fixedly connected to the outer side of a large pile and a small pile of a T-shaped beam or an I-shaped beam cast-in-place continuous section above the bridge pier (8), wherein a steering pipe is arranged on the hogging moment area steering block (4), and the steering pipe is positioned inside the hogging moment area steering block (4).

8. An external prestressed reinforcement structure of assembled continuous T-beam or I-beam according to claim 1, characterized in that: the hogging moment area side beam outer side steering block (5) is fixedly connected above the bridge pier (8) and located at the continuous section outside the integral T beam or the I-shaped beam (1), a steering pipe is arranged on the hogging moment area side beam outer side steering block (5), and the steering pipe is located inside the hogging moment area side beam outer side steering block (5).

9. An external prestressed reinforcement structure of assembled continuous T-beam or I-beam according to claim 1, characterized in that: an injection molding layer, an anti-rust layer, a waterproof layer and a warning layer are sequentially arranged on the outer surfaces of the T-shaped beam or the I-shaped beam (1), the anchoring block (2), the positive bending moment area steering block (3), the negative bending moment area steering block (4), the negative bending moment area side beam outer side steering block (5), the outer beam (6), the anchoring device (7) and the bridge pier (8) from inside to outside, and fluorescent powder is coated on the warning layer.

10. An external prestressed reinforcement structure of assembled continuous T-beam or I-beam according to claim 8, characterized in that: the injection layer is injected with a high polymer wear-resistant material; the anti-rust layer comprises epoxy zinc-rich primer, chlorinated rubber finish paint and epoxy mica iron intermediate paint positioned between the epoxy zinc-rich primer and the chlorinated rubber finish paint; the waterproof layer is polyurethane waterproof paint; the warning layer is a reflective warning tape or a reflective color film or reflective paint with single color or multiple colors mixed with each other.

Images