CN112458927A - Transformation and reinforcement method for overhanging structure of highway bridge - Google Patents
Transformation and reinforcement method for overhanging structure of highway bridge Download PDFInfo
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- CN112458927A CN112458927A CN202011137687.5A CN202011137687A CN112458927A CN 112458927 A CN112458927 A CN 112458927A CN 202011137687 A CN202011137687 A CN 202011137687A CN 112458927 A CN112458927 A CN 112458927A
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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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Abstract
The invention discloses a method for improving and reinforcing a highway bridge cantilever structure, which comprises the following steps: s1: milling and planing an asphalt layer on a top plate in the range above an old box girder cantilever arm, and planing off the top layer part of the top plate to expose a contact surface, wherein the contact surface is a concave-convex surface with the height difference not less than 6 mm; s2: after cleaning the contact surface, paving reinforcing mesh distributed transversely and longitudinally on the contact surface, and simultaneously pre-burying guardrail reinforcing steel bars required by a new guardrail; s3: pouring high-performance concrete on the contact surface to embed the reinforcing mesh in the high-performance concrete, and curing and forming to form a high-performance concrete layer; s4: and paving the pavement to finish the transformation and reinforcement. The construction position of the reconstruction and reinforcement method is mainly located on the box girder top and the bridge floor, the construction process is simple, large-scale construction equipment is not needed, the construction efficiency can be effectively accelerated, the bearing capacity after reinforcement is obviously improved, and the reconstruction and reinforcement method can meet the application requirements of development.
Description
Technical Field
The invention belongs to the technical field of road construction and transformation, and particularly relates to a transformation and reinforcement method for a cantilever structure of a highway bridge.
Background
The overhanging is an effect that the building component achieves by using a guy cable structure or other structures. The overhanging structure is one of the common structural forms in engineering structures, such as a rain fly, a cornice, an outer balcony, a porch and the like in building engineering, and the structure is that a beam or a plate is overhung from a main structure to form an overhanging structure, and the overhanging structure is still a beam-plate structure essentially.
The box girder cantilever is a typical cantilever structure, and its wide application is in the bridge construction field, and the box girder increases the section width through setting up big cantilever, practices thrift construction cost.
Along with the high-speed development of economic society of China, the urbanization speed is continuously accelerated, the land transportation demand is strong, and the highway not only meets the early main framework connection function, but also has the dual-function requirement of main framework connection and regional internal communication. The construction of the highway can not be separated from the construction of the bridge, so that the box girder cantilever structure can be seen almost everywhere.
The social, natural and humanistic environments determine that the future highway engineering construction scheme in China will mainly be reconstructed and expanded: the width of the current road is not enough to support the regional traffic development, and the original road needs to be widened. The construction target of reconstruction and extension projects is formed by safe, smooth, high-quality, durable, green, environment-friendly and intelligent creation, and how to reconstruct the old road to reach the standard after extension on the premise of economy, applicability and simplicity, traffic conversion difficulty reduction and safety guarantee becomes an urgent demand for current development.
Due to the limitation of the prior art, the existing cantilever structure of the old bridge box girder in the old road generally has the following problems:
(1) because the construction age is earlier, the load capacity is designed according to the current requirements, under the conditions of guardrail transformation and upgrading and automobile load grade improvement, the load capacity of the old box girder cantilever is insufficient or the crack width is over-limited according to the new specification;
(2) the existing old bridge box girder cantilever is generally longer in length, smaller in structural size and weaker in reinforcement, so that the overall strength is weaker;
(3) the old bridge guardrail has low anti-collision grade, insufficient guardrail height and weak reinforcement, and is difficult to ensure the driving safety on the highway.
Along with the overall blossoming of the road reconstruction and expansion project, the reconstruction and utilization of the existing cantilever of the box girder of the old bridge on the road becomes a key factor for restricting the progress and safety of the reconstruction and expansion project, so that the reconstruction project of the old road is urgent.
The method generally adopted for reconstructing the cantilever structure of the old box girder at present comprises the steps of firstly, integrally removing the cantilever part and then rebuilding; or secondly, a reinforced supporting structure is additionally arranged on the cantilever structure of the box girder.
For the first transformation mode, the overall dismantling and reconstruction require a large amount of work, long time consumption and high cost, and the construction requirement of the current high-speed transformation cannot be met.
For the second transformation mode, chinese patent CN 207597282U discloses a reinforced steel support structure for a flange plate of a cantilever of a bridge, which is supported at the outer sides of the lower edge and the web plate of the cantilever of the bridge, and the base of the reinforced steel support structure is fixed at the outer sides of the lower edge and the web plate of the cantilever of the bridge through anchor bolts. Chinese patent CN 104328748B discloses a corbel end reinforcing structure of a cantilever bridge and a mounting method thereof, wherein a rigid beam of the reinforcing structure is arranged along the extending direction of the bridge to support a corbel end adjacent to a bridge pier, and load of the corbel end is shared and transmitted to the bridge pier through the rigid beam, so as to achieve the purpose of improving stress of the corbel end.
Although the reinforcing effect of the two reinforcing structures is good, the construction process and the operation are located on the lower edge of the cantilever in the whole process, so that the construction can be completed by means of certain large-scale construction equipment in the construction process, the construction efficiency can be limited to a certain extent, and the requirement for rapid transformation cannot be met.
Disclosure of Invention
The invention aims to provide a reconstruction and reinforcement method for a highway bridge overhanging structure, the construction position of the reconstruction and reinforcement method is mainly positioned on a box girder top and a bridge floor, the construction process is simple, large-scale construction equipment is not required, the construction efficiency can be effectively accelerated, the bearing capacity after reinforcement is obviously improved, and the reconstruction and reinforcement method can meet the application requirements of development.
The purpose of the invention is realized by the following technical scheme:
a method for improving and reinforcing a cantilever structure of a highway bridge comprises the following steps:
s1: milling and planing an asphalt layer on a top plate in the range above an old box girder cantilever arm, milling and planing the top layer part of the top plate to expose a contact surface, wherein the contact surface is a concave-convex surface with the height difference not less than 6 mm;
s2: after cleaning the contact surface, paving reinforcing mesh distributed transversely and longitudinally on the contact surface, and simultaneously pre-burying guardrail reinforcing steel bars required by a new guardrail;
s3: pouring high-performance concrete on the contact surface to embed the reinforcing mesh in the high-performance concrete, and curing and forming to form a high-performance concrete layer;
s4: and paving the pavement to finish the transformation and reinforcement.
The method for improving and reinforcing the old box girder cantilever arm and the top plate above the old box girder cantilever arm has the advantages that a metal supporting structure is added below the old box girder cantilever arm to improve the reinforcing method for bearing and bearing capacity, a high-performance concrete layer is poured on the top plate of the old box girder cantilever arm, and the old box girder cantilever arm and the top plate above the old box girder cantilever arm are dragged from the top through high mechanical properties brought by high-performance concrete and reinforcing mesh, so that the reinforcing and improving are realized.
According to the reinforcing and reforming method, the old box girder cantilever arm does not need to be dismantled and rebuilt, the construction is mainly carried out on the bridge floor, and the construction under the old box girder cantilever arm is not needed, so that a large-scale construction instrument is not needed, and the construction efficiency of reinforcing and reforming can be effectively improved.
The high-performance concrete used in the invention is preferably cubic with the compression strength of more than or equal to 100MPa, the breaking strength of more than or equal to 18MPa and the elastic modulus of 4.25 multiplied by 104High-performance concrete of MPa.
The high-performance concrete comprises the components of cement, silica fume, quartz sand, blast furnace slag, steel fiber, pure cellulose fiber, high-strength coarse aggregate and the like. The grain size of the high-strength coarse aggregate is less than or equal to 4 mm.
As one embodiment of the present invention, after the high-performance concrete layer is poured in S3, the height of the high-performance concrete layer is higher than the original top surface height of the top plate. This embodiment can make the high performance concrete layer have enough thickness to guarantee it has sufficient mechanical strength, but this embodiment will relatively increase the construction volume when road surface is spread.
As a second embodiment of the present invention, in the milling process of S1, the original steel bar milled to the top plate is exposed from the contact surface; and after the high-performance concrete layer is poured in the S3, the height of the high-performance concrete layer is equal to the original top surface height of the top plate. This way can not only guarantee the thickness of the high-performance concrete layer, but also reduce the construction amount when paving, but also correspondingly increase the construction amount of milling and planing.
In both the first embodiment and the second embodiment, after the reinforcement and modification, the bearing capacity can meet the actual use requirement.
The length of the box girder cantilever arm is 2.7-3 m generally, and the transverse stress is obviously higher than that of the longitudinal direction, so that the reinforcing steel bars distributed transversely in the reinforcing steel bar mesh are recommended to be selected from reinforcing steel bars with higher strength. Preferably, the reinforcing steel bars in the reinforcing mesh are HRB400-16mm in transverse direction, and the reinforcing steel bars in longitudinal direction are HRB400-10mm in longitudinal direction.
In order to ensure firm contact and common stress between the high-performance concrete layer and the top plate, when milling and planning are carried out in S1, the width of the contact surface is set to be the distance of 1-1.2 meters from the edge of the top plate to the root of the cantilever of the old box girder to extend into the box girder.
Compared with the prior art, the invention has the following beneficial effects:
1. the transformation and reinforcement method provided by the invention adopts a mode of pouring the high-performance concrete layer on the top plate of the old box girder cantilever arm, and the old box girder cantilever arm and the top plate above the old box girder cantilever arm are acted by common stress from the top to realize the reinforcement and the transformation without depending on large-scale construction equipment, so that the construction difficulty and the construction amount are greatly reduced, the construction efficiency is improved, and the development requirement of rapid transformation construction is met.
2. The invention selects the high-performance concrete layer, has ultrahigh tensile strength and pressure intensity, has good construction performance, does not need integral maintenance and is convenient to construct.
3. After the improved reinforcing method is used for reinforcing, the bearing capacity of the pavement at the cantilever arm of the box girder is obviously improved.
Drawings
The invention is further illustrated by the following figures.
FIG. 1 is a schematic diagram of the effect of embodiment 1 after reconstruction and reinforcement.
Fig. 2 is a partial cross-sectional view of fig. 1.
Fig. 3 is a schematic diagram of the effect of embodiment 2 after reconstruction and reinforcement.
Fig. 4 is a partial cross-sectional view of fig. 3.
Reference numerals: 1-box girder cantilever arm; 2-high performance concrete layer; 3-a top plate; 4-guard bar; 5-contact surface; 6-longitudinal steel bars; 7-transverse steel bars; 8-guardrail steel bars.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1
The old box girder cantilever arm of the highway is reformed and reinforced by the following method:
s1: milling and milling an asphalt layer on a top plate 3 in the range above an old box girder cantilever arm 1 to expose the top plate 3, and milling the top layer part of the top plate 3 for 2cm to expose a contact surface 5;
s2: after the contact surface 5 is processed, a reinforcing mesh which is distributed transversely and longitudinally is laid on the contact surface 5, and meanwhile, guardrail reinforcing steel bars 8 required by a new guardrail are pre-buried;
s3: pouring high-performance concrete on the contact surface 5 to enable the reinforcing mesh to be embedded in the high-performance concrete, and forming a high-performance concrete layer 2 through curing and forming, wherein the thickness of the high-performance concrete layer 2 is 8cm and is 6cm higher than the original top surface of the top plate 3;
s4: paving an asphalt surface layer to complete the reconstruction and reinforcement.
The effect after the reinforcement and modification by the method is shown in figure 1, the high-performance concrete layer 2 covers the contact surface 5 of the top plate 3 above the cantilever arm 1 of the box girder, the height of the contact surface is higher than the top surface of the top plate 3, and the edge of the contact surface is provided with a guardrail 4.
As shown in fig. 2, the reinforcing mesh embedded in the high-performance concrete layer 2 comprises longitudinal steel bars 6 and transverse steel bars 7, wherein the longitudinal steel bars 6 are HRB400-10mm steel bars, and the transverse steel bars 7 are HRB400-16mm steel bars, so as to better meet the stress requirement.
Example 2
The old box girder cantilever arm of the highway is reformed and reinforced by the following method:
s1: milling and milling an asphalt layer on a top plate 3 in the range above an old box girder cantilever arm 1 to expose the top plate 3, milling and milling the top layer part of the top plate 3 for 8cm to expose the original steel bars and a contact surface 5 of the top plate 3;
s2: after the contact surface 5 is processed, a reinforcing mesh which is distributed transversely and longitudinally is laid on the contact surface 5, and meanwhile, guardrail reinforcing steel bars 8 required by a new guardrail are pre-buried;
s3: pouring high-performance concrete on the contact surface 5 to enable the reinforcing mesh to be embedded in the high-performance concrete, and forming a high-performance concrete layer 2 through curing and forming, wherein the thickness of the high-performance concrete layer 2 is 8cm and is equal to the height of the original top surface of the top plate 3;
s4: paving an asphalt surface layer to complete the reconstruction and reinforcement.
The effect after the reinforcement and modification by the method is shown in fig. 3, the high-performance concrete layer 2 covers the contact surface 5 of the top plate 3 above the cantilever arm 1 of the box girder, the height of the high-performance concrete layer is equal to the top surface of the top plate 3, and the edge of the high-performance concrete layer is provided with the guardrail 4.
As shown in fig. 4, the reinforcing mesh embedded in the high-performance concrete layer 2 comprises longitudinal steel bars 6 and transverse steel bars 7, wherein the longitudinal steel bars 6 are HRB400-10mm steel bars, and the transverse steel bars 7 are HRB400-16mm steel bars, so as to better meet the stress requirement.
It should be noted that the above-mentioned embodiments are only illustrative and not restrictive, and any adjustment or change within the meaning and scope equivalent to the technical solution of the present invention or applied to the reinforcement of other cantilever structures by those skilled in the art should be considered to be included in the protection scope of the present invention.
Claims (8)
1. The method for improving and reinforcing the overhanging structure of the highway bridge is characterized by comprising the following steps of:
s1: milling and planing an asphalt layer on a top plate in the range above an old box girder cantilever arm, milling and planing the top layer part of the top plate to expose a contact surface, wherein the contact surface is a concave-convex surface with the height difference not less than 6 mm;
s2: after cleaning the contact surface, paving reinforcing mesh distributed transversely and longitudinally on the contact surface, and simultaneously pre-burying guardrail reinforcing steel bars required by a new guardrail;
s3: pouring high-performance concrete on the contact surface to embed the reinforcing mesh in the high-performance concrete, and curing and forming to form a high-performance concrete layer;
s4: and paving the pavement to finish the transformation and reinforcement.
2. The method for improving and reinforcing the overhanging structure of the highway bridge according to claim 1, wherein the high-performance concrete has cubic compressive strength of not less than 100MPa, flexural strength of not less than 18MPa and elastic modulus of 4.25 x 104High-performance concrete of MPa.
3. The method for improving and reinforcing the overhanging structure of the road bridge according to claim 2, wherein the high-performance concrete comprises cement, silica fume, quartz sand, blast furnace slag, steel fiber, pure cellulose fiber and high-strength coarse aggregate.
4. The method for improving and reinforcing the overhanging structure of the highway bridge according to claim 3, wherein the grain diameter of the high-strength coarse aggregate is less than or equal to 4 mm.
5. The method for improving and reinforcing the overhanging structure of the road bridge according to claim 1, wherein after the high-performance concrete layer is poured in the step S3, the height of the high-performance concrete layer is higher than the original top surface height of the top plate.
6. The method for rebuilding and reinforcing an overhanging structure of a road bridge according to claim 1, wherein the original steel bars milled to the top plate are exposed from the contact surface when the milling process is performed in S1; and after the high-performance concrete layer is poured in the S3, the height of the high-performance concrete layer is equal to the original top surface height of the top plate.
7. The method for reconstructing and reinforcing a cantilever structure of a highway bridge according to claim 1, wherein the reinforcing steel bars in the reinforcing mesh are HRB400-16mm in the transverse direction, and the reinforcing steel bars in the longitudinal direction are HRB400-10mm in the longitudinal direction.
8. The method for reconstructing and reinforcing an overhanging structure of a road bridge according to claim 1, wherein the width of the contact surface is set to a distance from the edge of the roof to the root of the cantilever of the old box girder to extend 1 to 1.2 m into the box girder when milling is performed at S1.
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| CN202011137687.5A CN112458927A (en) | 2020-10-22 | 2020-10-22 | Transformation and reinforcement method for overhanging structure of highway bridge |
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Address after: No.146, huangbian North Road, Baiyun District, Guangzhou, Guangdong 510440 Applicant after: Guangdong transportation planning and Design Institute Group Co.,Ltd. Address before: No.22 Xinghua Road, Tianhe District, Guangzhou City, Guangdong Province Applicant before: GUANGDONG PROVINCE COMMUNICATIONS PLANNING & DESIGN INSTITUTE Co.,Ltd. |
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