CN112942144A - Reinforced concrete arch bridge reinforcing method based on thermal expansion principle - Google Patents
Reinforced concrete arch bridge reinforcing method based on thermal expansion principle Download PDFInfo
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- CN112942144A CN112942144A CN202110108536.5A CN202110108536A CN112942144A CN 112942144 A CN112942144 A CN 112942144A CN 202110108536 A CN202110108536 A CN 202110108536A CN 112942144 A CN112942144 A CN 112942144A
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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
Abstract
The invention discloses a reinforced concrete arch bridge reinforcing method based on a thermal expansion principle, belongs to the technical field of arch bridge reinforcement, and belongs to the technical field of building construction. The reinforcing method aims at the hinge-arch-free statically indeterminate structure, and utilizes the thermal expansion principle to reversely lift the concrete arch ring by raising the temperature and expanding the steel structure, so that the steel structure and the concrete arch ring are mutually tightened and cooperatively stressed, the line shape of the arch ring can be effectively improved, the stress state of the concrete of the arch ring can be optimized, and the problem that a reinforcing joint surface is easy to fall off can be avoided. The steel structure is adopted for reinforcement, so that the section rigidity of the arch ring can be greatly improved, and the characteristic of high yield strength of steel can be fully utilized to greatly improve the ultimate bearing capacity of the arch ring. The reinforcing method is simple and convenient, construction quality is guaranteed, and the reinforcing efficiency is high and the effect is good.
Description
Technical Field
The invention belongs to the technical field of arch bridge reinforcement, and particularly relates to a reinforced concrete arch bridge reinforcement method based on a thermal expansion principle.
Background
At present, tens of thousands of reinforced concrete arch bridges exist in China, wherein the middle-small span reinforced concrete arch bridges account for the vast majority and are mostly distributed on low-grade roads such as national roads, provinces, counties and counties. Along with the rapid growth of domestic economy, the gradual promotion of traffic transportation volume and automobile design load grade, the existing large quantity of small and medium span reinforced concrete arch bridges cannot meet the long-term requirements of traffic development in times due to long service life. The existing traffic flow is inconsistent with the design and use conditions of the original bridge, the bridge becomes a key bottleneck restricting traffic development, the passing of vehicles passing through the road is seriously influenced, and more small and medium span reinforced concrete arch bridges are developed into old bridges along with the time. Therefore, the reinforcement of the reinforced concrete arch bridge with the medium and small span is one of the most effective measures for improving the vehicle traffic capacity of the low-grade highway. Aiming at reinforcing a reinforced concrete arch bridge, the most common methods at present comprise: (1) an arch ring section enlarging method, (2) a steel plate (carbon fiber cloth) pasting method, and (3) an external prestressing method.
(1) Method for enlarging cross section of arch ring
The advantages are that: the rigidity of the section of the arch ring and the ultimate bearing capacity of the whole arch bridge can be improved;
the disadvantages are as follows: firstly, construction processes such as chiseling, bar planting, formwork erecting, concrete pouring, maintenance and the like are required, the size of the enlarged section is small, the whole construction process is complex and high in difficulty, and the construction quality is difficult to guarantee; secondly, the shrinkage and creep of the new concrete and the old concrete are inconsistent, so that the joint surface is easy to fall off; and the limit bearing capacity of the newly added concrete on the whole arch bridge is improved to a limited extent due to lower yield strength and stress retardation of the material.
(2) Method for sticking steel plate (carbon fiber cloth)
The advantages are that: the development of concrete cracks of the arch ring can be effectively limited;
the disadvantages are as follows: firstly, the durability of the pasting material is easy to lose efficacy, which causes the steel plate (carbon fiber cloth) to be peeled off; secondly, the improvement of the rigidity of the section of the arch ring and the ultimate bearing capacity of the arch bridge is very limited, and the strengthening efficiency is low.
(3) External prestressing method
The advantages are that: the arch ring line shape and the concrete stress distribution can be effectively improved;
the disadvantages are as follows: firstly, the construction of the anchorage installation is complex and difficult, the prestress loss is difficult to control, and the maintenance difficulty is large; secondly, the stress condition of the arch ring can be only partially improved, the improvement of the rigidity of the section of the arch ring and the ultimate bearing capacity of the arch bridge is very limited, and the strengthening efficiency is low.
Disclosure of Invention
In view of the above, the present invention provides a reinforced concrete arch bridge reinforcing method based on a thermal expansion principle, which utilizes the thermal expansion principle to raise the temperature of a steel structure to expand and reversely lift a concrete arch ring, so that the steel structure and the concrete arch ring are mutually hooped and cooperatively stressed, thereby effectively improving the line shape of the arch ring and optimizing the stress state of the concrete arch ring, and avoiding the problem that a reinforcing joint surface is easy to fall off. The steel structure is adopted for reinforcement, so that the section rigidity of the arch ring can be greatly improved, and the characteristic of high yield strength of steel can be fully utilized to greatly improve the ultimate bearing capacity of the arch ring.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention relates to a reinforced concrete arch bridge reinforcing method based on a thermal expansion principle, which comprises the following steps of:
(1) reinforcement design: determining through reinforcement design according to the detection result and the reinforcement target of the arch bridge to be reinforced: firstly, an arch ring concrete repairing scheme is adopted; secondly, an arch foot foundation reinforcing scheme; the structural form and the section size of the steel structure; fourthly, the temperature load T required to be applied by the steel structureTemperature differenceSelecting a suitable TAtmospheric temperatureAnd according to the formula TTemperature difference＝TAtmospheric temperature-TControlling temperatureTo obtain TControlling temperature(ii) a Manufacturing a steel structure and assembling and welding;
(2) strengthening construction of arch foot foundation;
(3) building a construction platform, and performing concrete repair construction on the arch ring;
(4) sealing the space and cooling;
(5) constructing a steel structure;
(6) applying a temperature load;
(7) performing anticorrosive treatment on the steel structure;
(8) and (5) removing the bracket.
Further, in the step (1), the steel structure comprises steel box girders, steel trusses, square steel ribs and other structural forms, and is provided with transverse connection members and transverse bridge baffles. The transverse connection member is used for enhancing the transverse integral stress performance of the steel structure, and the transverse bridge direction baffle plates are arranged on two sides of the steel structure and used for limiting transverse bridge direction sliding between the concrete arch ring and the steel structure.
Further, in the step (2), the arch foot foundation is reinforced and expanded according to the arch foot foundation reinforcing scheme, and a steel member matched with the reinforcing steel structure is buried in a preset position.
Further, in the step (3), the building construction platform is a building under-arch construction operation platform, the arch ring concrete repair construction repairs the defects and cracks of the original arch ring concrete according to an arch ring concrete repair scheme, and heat insulation materials are uniformly coated on the contact surfaces of the lower surface, the side surfaces and the like of the arch ring concrete and the steel structure.
Further, in the step (4), the step of cooling the closed space refers to cooling the closed space by using refrigeration equipment to achieve T, wherein the step of cooling the closed space is to reinforce the operating space under the closed archControlling temperatureAnd then held constant.
Further, in the step (5), the steel structure construction is to convey the manufactured steel structure component into a reinforcing operation space, and a temporary support is built on a construction platform to support the steel structure, so that the upper component of the steel structure is ensured to be tightly attached to the lower surface of the arch ring concrete; waiting for temperature and T of steel structureControlling temperatureWelding can be carried out after the welding is consistent; welding and assembling along the direction from the arch foot to the arch crown, and finally closing the arch crown; the upper components are welded and assembled, then the abdomen components are welded and assembled, and finally the lower components are welded and assembled.
Further, in the step (6), after the steel structures are completely welded and assembled, selecting proper time according to the atmospheric temperature to open the closed space for under-arch reinforcement operation so that the steel box girder is exposed in the atmosphere and the temperature of the steel box girder finally reaches TAtmospheric temperature。
Further, after step (4) is completed, the arch building is dismantled according to the reinforcement design scheme.
And (3) further, after the step (6) is finished, performing arch building construction according to a reinforcement design scheme.
The invention has the beneficial effects that:
(1) avoid reinforcing the composition surface and produce and drop:
the reinforcing method aims at the hinge-arch-free statically indeterminate structure, and utilizes the thermal expansion principle to reversely lift the concrete arch ring by raising the temperature and expanding the steel structure, so that the steel structure and the concrete arch ring are mutually hooped and cooperatively stressed without being bonded. The steel material of the reinforcing material has no shrinkage problem, and the creep amount can be ignored in a low stress state. Therefore, the problem of joint face falling caused by the inconsistent shrinkage and creep of new and old concrete in the common section enlarging method is avoided.
(2) Effectively improving the stress state of the concrete arch ring:
the most common diseases of the concrete arch ring are that the arch ring is linear and downwarped, the concrete at the lower edge is cracked, the concrete arch ring is reversely jacked by the temperature rise expansion of a steel structure (which is equivalent to an external prestress reinforcing method), and the arch ring is linear and the concrete stress distribution can be effectively improved. The arch building is constructed by dismantling the arch building, reinforcing the concrete arch ring and constructing the arch building, so that the stress state of the concrete arch ring can be further optimized, the ratio of the load effect to the structural resistance is reduced, and the safety reserve of the whole bridge is improved.
(3) Greatly improving the ultimate bearing capacity of the arch ring:
the steel structure is adopted for reinforcement (equivalent to a method for reinforcing the section by increasing the section), so that the section rigidity of the arch ring can be greatly improved. The yield strength of steel is far greater than that of concrete, so that the adverse effect of stress hysteresis on the ultimate bearing capacity can be greatly weakened, and the ultimate bearing capacity of the arch ring is greatly improved.
(4) The reinforcement construction process is simple:
the reinforcement method only needs to set up a closed space on the construction platform, and adopts cooling measures to the closed space, and the steel structure adopts prefabrication and field welding assembly. The whole construction process is simple and convenient, and the construction quality is guaranteed.
Additional advantages, objects, and features of the invention will be set forth in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a first flow chart of the arch bridge reinforcing method of the present invention;
FIG. 2 is a second flow chart of the arch bridge reinforcing method of the present invention;
FIG. 3 is a third flow chart of the arch bridge reinforcing method of the present invention;
FIG. 4 is a fourth flow of the arch bridge reinforcement method of the present invention;
FIG. 5 is a fifth flow chart of the arch bridge reinforcing method of the present invention;
FIG. 6 is a schematic view of the reinforced concrete plate arch steel box girder structure of the present invention;
FIG. 7 is a schematic structural view of a reinforced concrete double-arch steel box girder according to the present invention;
fig. 8 shows the principle of the arch bridge reinforcing method of the invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the description of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1 to 8, the reinforced concrete arch bridge reinforcing method based on the thermal expansion principle of the invention comprises the following steps:
(1) reinforcement design: determining through reinforcement design according to the detection result and the reinforcement target of the arch bridge to be reinforced: firstly, an arch ring concrete repairing scheme is adopted; secondly, an arch foot foundation reinforcing scheme; the structural form and the section size of the steel structure; fourthly, the temperature load T required to be applied by the steel structureTemperature differenceSelecting a suitable TAtmospheric temperatureAnd according to the formula TTemperature difference＝TAtmospheric temperature-TControlling temperatureTo obtain TControlling temperature(ii) a Manufacturing a steel structure and assembling and welding.
(2) And (3) arch foot foundation reinforcement construction: and reinforcing and expanding the arch springing foundation according to the arch springing foundation reinforcing scheme, and burying a steel member matched with the reinforcing steel structure at a preset position.
(3) Building a construction platform, and performing concrete repair construction on the arch ring: and (3) building an under-arch construction operation platform, repairing the defects and cracks of the concrete of the original arch ring according to the arch ring concrete repairing scheme, and uniformly coating heat insulation materials on the contact surfaces of the lower surface, the side surfaces and the like of the concrete of the arch ring and the steel structure.
(4) And (3) closing the space, and implementing cooling: reinforcing the working space under the closed arch, and utilizing refrigeration equipment to implement cooling on the closed space to obtain TControlling temperatureAnd then held constant.
(5) Removing the arch building: as necessary according to the reinforcement design.
(6) Construction of a steel structure: transporting the manufactured steel structure component into a reinforcing operation space, and building a temporary support on a construction platform to support a steel structure, so as to ensure that the upper component of the steel structure is tightly attached to the lower surface of the arch ring concrete; waiting for temperature and T of steel structureControlling temperatureWelding can be carried out after the welding is consistent; welding and assembling along the direction from the arch foot to the arch crown, and finally closing the arch crown; the upper components are welded and assembled, then the abdomen components are welded and assembled, and finally the lower components are welded and assembled.
(7) Applying a temperature load: after the steel structures are completely welded and assembled, selecting proper time according to the atmospheric temperature, opening the closed space for reinforcing operation under the arch, and exposing the steel box girder in the atmosphere to finally reach the temperature TAtmospheric temperature。
(8) And (3) building construction on the arch: as necessary according to the reinforcement design.
(9) Performing anticorrosive treatment on the steel structure;
(10) and (5) removing the bracket.
The reinforced concrete arch bridge reinforcing method based on the thermal expansion principle is particularly suitable for reinforcing medium and small span reinforced concrete arch bridges and is also suitable for reinforcing stone arch bridges and masonry arch bridges. Method for reinforcement construction TTemperature differencePreferably controlled within 20-30 ℃, so that T is within the summerAtmospheric temperatureConstruction is more suitable at higher time, so TControlling temperatureThe height of the steel plate can not be too low, so that the steel plate saves energy and is convenient to construct. For reinforcing the large-span reinforced concrete arch bridge, the reinforcing method is also applicable, is only limited by temporary construction measures such as construction platform building, cooling and heat preservation and the like, and is poor in economical efficiency.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (9)
1. A reinforced concrete arch bridge reinforcing method based on a thermal expansion principle is characterized by comprising the following steps: the method comprises the following steps:
(1) reinforcement design: determining through reinforcement design according to the detection result and the reinforcement target of the arch bridge to be reinforced: firstly, an arch ring concrete repairing scheme is adopted; secondly, an arch foot foundation reinforcing scheme; the structural form and the section size of the steel structure; fourthly, the temperature load T required to be applied by the steel structureTemperature differenceSelecting a suitable TAtmospheric temperatureAnd according to the formula TTemperature difference＝TAtmospheric temperature-TControlling temperatureTo obtain TControlling temperature(ii) a Manufacturing a steel structure and assembling and welding;
(2) strengthening construction of arch foot foundation;
(3) building a construction platform, and performing concrete repair construction on the arch ring;
(4) sealing the space and cooling;
(5) constructing a steel structure;
(6) applying a temperature load;
(7) performing anticorrosive treatment on the steel structure;
(8) and (5) removing the bracket.
2. A reinforced concrete arch bridge reinforcing method based on the thermal expansion principle according to claim 1, wherein: in the step (1), the steel structure comprises steel box girders, steel trusses, square steel ribs and other structural forms, and is provided with transverse connection members and transverse bridge direction baffles, the transverse connection members are used for reinforcing the transverse overall stress performance of the steel structure, and the transverse bridge direction baffles are arranged on two sides of the steel structure and used for limiting transverse bridge direction slippage between the concrete arch ring and the steel structure.
3. A reinforced concrete arch bridge reinforcing method based on the thermal expansion principle according to claim 2, wherein: and (2) reinforcing and expanding the arch springing foundation according to the arch springing foundation reinforcing scheme in the arch springing foundation reinforcing construction, and burying a steel member matched with the reinforcing steel structure at a preset position.
4. A reinforced concrete arch bridge reinforcing method based on the thermal expansion principle according to claim 3, wherein: in the step (3), the construction platform is a construction operation platform under an arch, the arch ring concrete repair construction repairs the defects and cracks of the original arch ring concrete according to the arch ring concrete repair scheme, and heat insulation materials are uniformly coated on the contact surfaces of the lower surface, the side surfaces and the like of the arch ring concrete and the steel structure.
5. The reinforced concrete arch bridge reinforcing method based on the thermal expansion principle according to claim 4, wherein: in the step (4), the step of cooling the closed space refers to reinforcing the operation space under the closed arch, and the closed space is cooled by utilizing refrigeration equipment to reach TControlling temperatureAnd then held constant.
6. The reinforced concrete arch bridge reinforcing method based on the thermal expansion principle according to claim 5, wherein: in the step (5), the steel structure construction is to convey the manufactured steel structure component into a reinforcement operation space, and a temporary support is built on a construction platform to support a steel structure, so that the upper component of the steel structure is ensured to be tightly attached to the lower surface of the arch ring concrete; waiting for temperature and T of steel structureControlling temperatureWelding can be carried out after the welding is consistent; welding and assembling along the direction from the arch foot to the arch crown, and finally closing the arch crown; the upper components are welded and assembled, then the abdomen components are welded and assembled, and finally the lower components are welded and assembled.
7. The reinforced concrete arch bridge reinforcing method based on the thermal expansion principle according to claim 6, wherein: in the step (6), after the steel structure is completely welded and assembled, selecting a proper time according to the atmospheric temperature to open the closed space for reinforcing operation under the arch, and exposing the steel box girder in the atmosphere to enable the temperature of the steel box girder to finally reach TAtmospheric temperature。
8. A reinforced concrete arch bridge reinforcing method based on the thermal expansion principle according to any one of claims 1 to 7, wherein: and (5) after the step (4) is completed, removing the arch building according to the reinforcement design scheme.
9. A reinforced concrete arch bridge reinforcing method based on the thermal expansion principle according to claim 8, wherein: and (5) after the step (6), performing arch building construction according to a reinforcement design scheme.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113668409A (en) * | 2021-08-24 | 2021-11-19 | 福建九鼎建设集团有限公司 | External prestressed tendon fire-proof heat-insulation device |
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