CN110804959B - Beam-arch cooperative stone arch bridge reinforcing and load shedding method - Google Patents
Beam-arch cooperative stone arch bridge reinforcing and load shedding method Download PDFInfo
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- CN110804959B CN110804959B CN201911175741.2A CN201911175741A CN110804959B CN 110804959 B CN110804959 B CN 110804959B CN 201911175741 A CN201911175741 A CN 201911175741A CN 110804959 B CN110804959 B CN 110804959B
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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 relates to a stone arch bridge reinforcing and load shedding technology, in particular to a stone arch bridge reinforcing and load shedding method with cooperation of a beam and an arch. The invention solves the problem that the traditional stone arch bridge reinforcing and load reducing method is not beneficial to load diffusion at the arch top and causes the change of the stress mode of the main arch ring. A method for reinforcing and relieving load of a stone arch bridge with cooperation of a beam and an arch comprises the following steps: the method comprises the following steps: digging a plurality of grooves with the bottoms in the shape of the bending line of the simply supported beam on the top surface of the arch filler, and ensuring that the direction of each groove is consistent with that of the stone arch bridge; step two: prefabricating the multi-ribbed short T-shaped beam by adopting a pre-tensioning method, and ensuring that the number of the ribbed beams of the multi-ribbed short T-shaped beam is consistent with that of the grooves; step three: and (3) respectively fixing two ends of the multi-ribbed low T-shaped beam with the two abutment butt straps in a cast-in-place manner, and ensuring that the trend of each rib beam of the multi-ribbed low T-shaped beam is consistent with the trend of the stone arch bridge. The invention is suitable for reinforcing and load shedding of the stone arch bridge.
Description
Technical Field
The invention relates to a stone arch bridge reinforcing and load shedding technology, in particular to a stone arch bridge reinforcing and load shedding method with cooperation of a beam and an arch.
Background
In the using process of the stone arch bridge, the phenomenon of insufficient bearing capacity gradually occurs due to the weathering of materials and the influence of natural environment, so that the stone arch bridge needs to be reinforced and deloaded. However, the traditional stone arch bridge reinforcing and load shedding method has the following problems due to the limitation of the principle of the traditional stone arch bridge reinforcing and load shedding method: firstly, the traditional method for reinforcing and reducing the load of the stone arch bridge needs to reduce the thickness of the filler on the arch and replace and fill light materials or completely remove and fill the filler on the arch, so that the load diffusion at the arch top is not facilitated, the single-point stress is easily formed at the arch top, and the structure of the stone arch bridge is easily damaged. Secondly, the traditional stone arch bridge reinforcing and load shedding method needs to change the form of the arch building, so that the stress mode of the main arch ring is changed, the stone arch bridge is easy to generate structural risks, and the stone arch bridge is easy to collapse. Based on the above, a method for reinforcing and reducing the load of the stone arch bridge with the cooperation of the beam and the arch is needed to be invented, so that the problems that the traditional method for reinforcing and reducing the load of the stone arch bridge is not beneficial to load diffusion at the arch top and causes the change of the stress mode of the main arch ring are solved.
Disclosure of Invention
The invention provides a method for reinforcing and reducing load of a stone arch bridge with cooperation of a beam and an arch, aiming at solving the problems that the traditional method for reinforcing and reducing load of the stone arch bridge is not beneficial to load diffusion at the arch top and causes the change of the stress mode of a main arch ring.
The invention is realized by adopting the following technical scheme:
a method for reinforcing and relieving load of a stone arch bridge with cooperation of a beam and an arch comprises the following steps:
the method comprises the following steps: digging a plurality of grooves with the bottoms in the shape of the bending line of the simply supported beam on the top surface of the arch filler, ensuring that the direction of each groove is consistent with that of the stone arch bridge, and simultaneously ensuring that the grooves are arranged in parallel at equal intervals;
step two: prefabricating the multi-ribbed short T-shaped beam by adopting a pre-tensioning method, ensuring that the number of the ribbed beams of the multi-ribbed short T-shaped beam is consistent with that of the grooves, and simultaneously ensuring that all the ribbed beams of the multi-ribbed short T-shaped beam are arranged in parallel at equal intervals; then, supporting two ends of the multi-ribbed short T-shaped beam on two abutment caps to form a simply supported beam system;
step three: and (2) respectively fixing two ends of the multi-ribbed low T-shaped beam with two abutment butt straps in a cast-in-place manner, ensuring that the trend of each rib beam of the multi-ribbed low T-shaped beam is consistent with the trend of the stone arch bridge, and simultaneously ensuring that each rib beam of the multi-ribbed low T-shaped beam is positioned right above each groove in a one-to-one correspondence manner.
Compared with the traditional stone arch bridge reinforcing and load shedding method, the stone arch bridge reinforcing and load shedding method based on beam-arch coordination realizes the reinforcing and load shedding of the stone arch bridge (the concrete reinforcing and load shedding process is as follows, the automobile load acts on the beam structure firstly, the beam structure with the supporting point arranged on two bridge abutments bears a part of the automobile load through bending deformation, the beam structure deforms according to the bending line and then clings to the filler on the arch, the gap between the beam structure and the filler on the arch is zero, the residual automobile load is transmitted to the main arch ring of the stone arch bridge through the filler on the arch, and the main arch ring bears the self weight of the filler on the whole arch and the automobile load and reduces the self weight of the filler on the part of the arch and the part of the automobile load), thereby having the following advantages: firstly, the invention does not need to reduce or completely eliminate the filler on the arch, but only needs to dig the groove on the top surface of the filler on the arch and arrange the dense rib type short T-shaped beam to realize reinforcement and load reduction, thereby being beneficial to the load diffusion at the arch top, preventing the arch top from forming single-point stress and further protecting the structure of the stone arch bridge. Secondly, the invention does not need to change the form of the arch building, thereby preventing the stress mode of the main arch ring from changing, preventing the stone arch bridge from generating structural risk and further preventing the stone arch bridge from collapsing.
The method effectively solves the problems that the traditional method for reinforcing and reducing the load of the stone arch bridge is not beneficial to load diffusion at the arch top and causes the change of the stress mode of the main arch ring, and is suitable for reinforcing and reducing the load of the stone arch bridge.
Drawings
FIG. 1 is a schematic diagram of a first step of the present invention.
FIG. 2 is a schematic diagram of step three of the present invention.
Fig. 3 is a sectional view a-a of fig. 2.
In the figure: 1-arch filler, 2-groove, 3-dense rib type short T beam and 4-abutment butt strap.
Detailed Description
A method for reinforcing and relieving load of a stone arch bridge with cooperation of a beam and an arch comprises the following steps:
the method comprises the following steps: digging a plurality of grooves 2 with the bottoms in the shape of a simply supported beam deflection line on the top surface of the arch filler 1, ensuring that the direction of each groove 2 is consistent with that of the stone arch bridge, and simultaneously ensuring that each groove 2 is arranged in parallel at equal intervals;
step two: prefabricating the multi-ribbed short T-shaped beam 3 by adopting a pre-tensioning method, ensuring that the number of the ribbed beams of the multi-ribbed short T-shaped beam 3 is consistent with that of the grooves 2, and simultaneously ensuring that all the ribbed beams of the multi-ribbed short T-shaped beam 3 are arranged in parallel at equal intervals; then, supporting two ends of the multi-ribbed short T-shaped beam 3 on two abutment caps to form a simply supported beam system;
step three: and (2) respectively fixing two ends of the multi-ribbed short T-shaped beam 3 with two abutment butt straps 4 in a cast-in-place manner, ensuring that the trend of each rib beam of the multi-ribbed short T-shaped beam 3 is consistent with the trend of the stone arch bridge, and simultaneously ensuring that each rib beam of the multi-ribbed short T-shaped beam 3 is positioned right above each groove 2 in a one-to-one correspondence manner.
The span of the dense rib type short T-shaped beam 3 is larger than the net span of the stone arch bridge, and the difference between the two is 2-3 m.
The dense rib type short T-shaped beam 3 is prefabricated by adopting ultra-high performance concrete.
A batten soaked with asphalt is arranged between the rib beam of the multi-rib type short T beam 3 and the bottom of the groove 2; asphalt horseshoe grease and felt are filled between the rib beam of the multi-ribbed short T-shaped beam 3 and the groove wall of the groove 2.
In the first step, the equation of the simple supported beam deflection line is as follows:
in the formula: EI is beam stiffness; l is the span; and q is the uniform load concentration, and can be calculated according to a formula of 5.2.2-5.2.3 normal section bending-resistant bearing capacity in the design specification of highway reinforced concrete and prestressed concrete bridges and culverts under the condition that the section size and the reinforcing bars of the dense-rib type short T-shaped beam are known.
In the second step, the simply supported beam system bears a part of the automobile load and the dead weight of the filler on the original arch (the groove digging part).
In the third step, the length of the two abutment butt straps 4 is 0.55-0.65 times of the length of the multi-ribbed short T-shaped beam 3; the end parts of the two abutment butt straps 4 are provided with sleeper beam supports to form a 3-span continuous beam of a simply supported and continuous system, so that the dense rib type short T beam 3 bears the larger part of automobile load.
Claims (5)
1. A method for reinforcing and relieving load of a stone arch bridge with cooperative beam arch is characterized by comprising the following steps: the method is realized by adopting the following steps:
the method comprises the following steps: digging a plurality of grooves (2) with the bottoms in the shape of a simply supported beam deflection line on the top surface of the arch filler (1), ensuring that the direction of each groove (2) is consistent with that of the stone arch bridge, and simultaneously ensuring that the grooves (2) are arranged in parallel at equal intervals;
step two: prefabricating the multi-ribbed short T-shaped beam (3) by adopting a pre-tensioning method, ensuring that the number of the ribbed beams of the multi-ribbed short T-shaped beam (3) is consistent with that of the grooves (2), and simultaneously ensuring that all the ribbed beams of the multi-ribbed short T-shaped beam (3) are arranged in parallel at equal intervals; then, supporting two ends of the multi-ribbed short T-shaped beam (3) on two abutment caps to form a simply supported beam system;
step three: and two ends of the multi-ribbed short T-shaped beam (3) are respectively fixed with the two abutment butt straps (4) in a cast-in-place manner, the trend of each rib beam of the multi-ribbed short T-shaped beam (3) is consistent with the trend of the stone arch bridge, and the rib beams of the multi-ribbed short T-shaped beam (3) are correspondingly positioned right above the grooves (2) one by one.
2. A method for reinforcing and relieving load of a stone arch bridge with cooperation of a beam arch and a bridge arch, as claimed in claim 1, wherein: the span of the dense rib type short T-shaped beam (3) is larger than the net span of the stone arch bridge, and the difference between the two is 2-3 m.
3. A method for reinforcing and relieving load of a stone arch bridge with cooperation of a beam arch and a bridge arch, as claimed in claim 1, wherein: the multi-ribbed short T-shaped beam (3) is prefabricated by ultra-high performance concrete.
4. A method for reinforcing and relieving load of a stone arch bridge with cooperation of a beam arch and a bridge arch, as claimed in claim 1, wherein: a batten soaked with asphalt is arranged between the rib beam of the multi-rib type short T beam (3) and the bottom of the groove (2); asphalt horseshoe grease and felt are filled between the rib beam of the multi-ribbed short T-shaped beam (3) and the groove wall of the groove (2).
5. A method for reinforcing and relieving load of a stone arch bridge with cooperation of a beam arch and a bridge arch, as claimed in claim 1, wherein: in the third step, the length of the two abutment butt straps (4) is 0.55-0.65 times of the length of the multi-ribbed short T-shaped beam (3); the end parts of the two abutment butt straps (4) are provided with sleeper beam supports to form a 3-span continuous beam which is simply supported and then is of a continuous system, so that the dense rib type short T beam (3) bears the larger part of automobile load.
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| CN112064523B (en) * | 2020-09-29 | 2021-04-20 | 保利长大工程有限公司 | Reinforcing method for additionally arranging beam slab structure on old stone arch bridge |
| CN114086484A (en) * | 2021-11-16 | 2022-02-25 | 武汉理工大学 | Reinforcing method for additionally arranging prefabricated UHPC (ultra high performance polycarbonate) plate on back of arch leg of rigid frame arch bridge |
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