CN210315186U - Light arch bridge foundation structure - Google Patents
Light arch bridge foundation structure Download PDFInfo
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- CN210315186U CN210315186U CN201920748879.6U CN201920748879U CN210315186U CN 210315186 U CN210315186 U CN 210315186U CN 201920748879 U CN201920748879 U CN 201920748879U CN 210315186 U CN210315186 U CN 210315186U
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Abstract
The utility model discloses a light arch bridge foundation structure, which comprises an arch seat, an oblique foundation and a vertical foundation; the arch support is provided with an upper inclined plane, a lower inclined plane and a bottom plane; the upper inclined plane of the arch base is connected with the arch springing of the main arch; the lower inclined plane of the arch support is fixedly connected with the oblique foundation, and the bottom plane of the arch support is fixedly connected with the vertical foundation; the inclined foundation penetrates into the rock-soil layer along the extension line direction of the arch springing axis; the vertical foundation extends into the rock-soil layer along the vertical direction. The utility model relates to a light-duty arched bridge basis has that the structure is light and handy, and the excavation volume is little, and the concrete volume is little, and performance is reliable, and the construction degree of difficulty is little, and the advantage that engineering cost is low, the thick regional arched bridge basis of specially adapted overburden is built.
Description
Technical Field
The utility model particularly relates to a light-duty arched bridge foundation structure belongs to bridge engineering technical field.
Background
The arch bridge is one of four basic forms of bridge beams, and has an arch structure, under the action of vertical load, two ends of the arch structure generate horizontal thrust, the horizontal thrust can obviously offset the action of bending moment in an arch ring (or arch rib) caused by load, but if no self-balancing tie bar is arranged, the foundation is required to provide strong horizontal thrust, and therefore, the requirements on the foundation and geological conditions are high during the design of the arch bridge.
When the geological conditions are poor, the foundation of the arch bridge with the thrust force is difficult to construct, and a large-scale enlarged foundation or a large-scale pile group foundation is generally adopted. The large-scale enlarged foundation is characterized in that the foundation is enlarged, the contact surface is increased, and the buried depth is enlarged by enlarging excavation, so that the structure size is large, the concrete amount is large, and the excavation amount is large. When the slope is difficult to open and dig, special measures such as open caisson or underground continuous wall need to be taken, and the construction cost is high. The large pile group foundation is formed by connecting a plurality of pile groups with a pile top bearing platform and is divided into a large vertical pile foundation and a large inclined pile foundation. The large vertical pile foundation is suitable for bridge type without horizontal thrust, when the large vertical pile foundation is used as a thrust arch bridge foundation, the horizontal thrust is provided by bending and shearing the pile foundation, the force transmission efficiency of the stress form is low, the supporting rigidity is small, the required pile foundations are very large in quantity, and the size of a bearing platform is also very large. The large-scale inclined pile foundation is similar to the large-scale vertical pile foundation, only the vertical grouped piles are changed into the inclined grouped piles along the arch springing direction, so that the inclined piles can bear vertical force and horizontal force at the same time, and the large-scale inclined pile foundation has the defects of high construction difficulty and poor construction safety, and is hardly adopted by actual engineering.
In recent years, engineers have made attempts to improve arch bridge foundations, and have invented arch bases and well-digging foundations or ultra-large inclined single-pile foundations. The Chinese patent with the granted publication number of CN103215889B 'an arch bridge foundation for poor geological conditions and a construction method thereof', invents an arch support and a well digging foundation, and the arch support is constructed by sinking a well first, then the well digging foundation is excavated and poured by concrete. Compared with a large vertical pile foundation, the horizontal rigidity of the foundation is greatly increased, so that the vertical pile foundation can bear vertical force and horizontal force. The advantage of this patent is that the concrete dosage reduces, has increased the security and the economic nature of hunch seat structure, and its shortcoming is that open caisson hunch seat construction difficulty is great, and excavation well foundation also has certain degree of difficulty and engineering volume.
The Chinese patent with the granted publication number of CN104389317B discloses an ultra-large inclined single-pile foundation structure of a large-span arch bridge, which is characterized in that an ultra-large inclined single-pile foundation is invented, and is formed by tunnel-type inclined excavation and reinforced concrete backfill so as to resist the vertical force and the horizontal force of the arch bridge. The structural form is similar to that of a large-scale inclined pile foundation, and the inclined pile foundation has certain engineering feasibility by excavating in a tunnel method. The advantage of this patent has reduced basic excavation volume, reduces influence and the engineering cost to the environment, and its shortcoming is that the slant excavation section is big, and the country rock is strutted the degree of difficulty and is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a concrete volume is little to exist not enough among the prior art, and the light-duty arch bridge foundation structure of structure light and handy, firm.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a light arch bridge foundation structure comprises an arch support, an oblique foundation and a vertical foundation; the arch support is provided with an upper inclined plane, a lower inclined plane and a bottom plane; the upper inclined plane of the arch base is connected with the arch springing of the main arch; the lower inclined plane of the arch support is fixedly connected with the oblique foundation, and the bottom plane of the arch support is fixedly connected with the vertical foundation; the inclined foundation penetrates into the rock-soil layer along the direction of the extension line of the axis of the arch springing; the vertical foundation extends into the rock-soil layer along the vertical direction.
Furthermore, the included angle between the axis of the oblique foundation and the horizontal plane is equal to the included angle between the axis of the arch springing and the horizontal plane, so that the stress of the main arch ring (arch rib) is favorably transmitted to the foundation along a straight line, the bending moment of the angle is eliminated, meanwhile, the foundation surface is reached by a shorter path, and the excavation length of the oblique foundation is reduced.
Furthermore, the inclined foundation and the vertical foundation are all constant-section solid foundations provided with reinforcement cages and rigid frameworks.
Further, the cross section of the oblique foundation can be arched or circular, and the cross section of the vertical foundation can be circular.
Furthermore, the diameter of the cross section of the oblique foundation is 1.5 to 3 times of that of the cross section of the vertical foundation, because the oblique foundation is a main stress structure and bears all horizontal forces and most vertical forces of the arch bridge, the cross section of the oblique foundation is larger than that of the vertical foundation; meanwhile, in a triangular structure formed by the oblique foundation, the bottom bedrock and the vertical foundation, the vertical foundation bears the dead weight of the arch support in the construction process, the size of the cross section of the vertical foundation cannot be too small, the requirement of bridge construction can be met when the diameter of the cross section of the oblique foundation is 1.5-3 times that of the cross section of the vertical foundation, and the consumption of concrete in the engineering can be reasonably saved.
Compared with the prior art, the technical scheme has the following beneficial effects:
1. the utility model discloses close traditional hunch seat and cushion cap as an organic whole, form a new not huge hunch seat structure, main hunch circle (main arch rib) and basis are connected simultaneously to the hunch seat, do not need the cushion cap to carry out the internal force conversion, reduce the engineering volume.
2. The utility model discloses in, an hunch seat only needs a vertical basis, can adopt mechanical pore-forming, construction convenience, the risk is little, the cost is low, vertical pile group of conventional use is compared to vertical basis, can increase the horizontal anti rigidity of pushing away of basis, reduce hunch seat bottom surface area simultaneously, and then reduce hunch seat concrete use amount, vertical basis can form stable triangle-shaped structure with bottom bedrock and slant basis better moreover, thereby form whole atress structure, when having solved and using vertical pile group, outside stake contribution is little, and the not enough problem of inboard stake rigidity.
3. The utility model discloses in, an hunch seat also only needs a slant basis, and it adopts the tunnel construction of little stride, and slant tunnel excavation stride is little, and it is low to strut the degree of difficulty, and the construction risk is little.
4. The utility model discloses a design makes the bedrock of vertical basis, slant basis and basic bottom, has formed firm triangle-shaped overall structure jointly, and the structure is firm reliable, compares traditional large-scale expansion basis, very big reduction the engineering volume, compare other foundations of improved generation, then under the condition that has reduced certain engineering volume, provide bigger support rigidity, reduced basic deformation, improved basic reliability and practicality.
5. The utility model has the advantages of the structure is light and handy, and the excavation volume is little, and the concrete volume is little, and performance is reliable, and the construction degree of difficulty is little, and engineering cost is low, the thick area arch bridge basis of specially adapted overburden is built.
Drawings
Fig. 1 is a schematic structural diagram of a light arch bridge foundation structure according to the present invention.
Fig. 2 is a schematic cross-sectional view of the diagonal foundation described in example 1.
Fig. 3 is a structural view of an opening pipe shed support excavated by the diagonal foundation in example 1.
Fig. 4 is a structural diagram of an i-steel support in a hole dug by the diagonal foundation in example 1.
Reference numerals: 1-arch foot, 2-upper inclined plane, 3-lower inclined plane, 4-bottom plane, 5-arch support, 6-inclined foundation, 7-vertical foundation, 8-steel floral tube, 9-I-steel support, 10-portal pipe shed advance support and 11-steel arch frame.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, but the present invention is not limited to the examples. The specific experimental conditions and methods not indicated in the following examples are generally conventional means well known to those skilled in the art.
Example 1:
as shown in the attached figures 1-2, the light arch bridge foundation structure comprises an arch base 5, an oblique foundation 6 and a vertical foundation 7; the arch support is provided with an upper inclined plane 2, a lower inclined plane 3 and a bottom plane 4; the upper inclined plane 2 of the arch base 5 is connected with the arch springing 1 of the main arch; the lower inclined plane 3 of the arch support 5 is fixedly connected with an inclined foundation 6, and the bottom plane 4 of the arch support 5 is fixedly connected with a vertical foundation 7; the inclined foundation 6 penetrates into the rock-soil layer along the extension line direction of the axis of the arch springing 1; the vertical foundation 7 extends into the rock-soil layer along the vertical direction; the included angle between the axis of the oblique foundation 6 and the horizontal plane is equal to the included angle between the axis of the arch springing 1 and the horizontal plane; the oblique foundation 6 and the vertical foundation 7 are both constant-section solid foundations provided with reinforcement cages and rigid frameworks; the cross section of the oblique foundation 6 is arched, and the diameter of the oblique foundation is 6.0 m; the cross section of the vertical foundation 7 is circular, and the diameter of the vertical foundation is 2.8 m.
The concrete construction method of the light arch bridge foundation comprises the following steps:
the arch support 5 is constructed by adopting a conventional open cut method;
the vertical foundation 7 adopts a conventional mechanical excavation construction mode. If the construction conditions are not met, a conventional manual excavation construction mode can be adopted, but the protection work must be done;
the excavation of the oblique foundation 6 adopts a conventional tunnel excavation construction mode and adopts a double support mode of advanced support and primary support. As shown in fig. 3, the advance support adopts an opening pipe shed support 10, wherein a steel perforated pipe 8 is directly driven into a rock stratum for grouting to serve as a longitudinal support, and then a steel arch 11 is arranged to serve as a transverse annular support, so that a full-section advance support structure in an excavation range is formed. Due to the fact that the pipe shed is obliquely excavated, the upper section of the pipe shed is mainly used for surrounding rock supporting and preventing collapse, the lower section of the pipe shed is mainly used for preventing landslide, and after a closed supporting structure is finally formed, the supporting capacity of advance supporting is enhanced;
as shown in fig. 4, the primary support is made of i-steel supports 9, standard components of the i-steel supports 9 are prefabricated by i-steel according to the cross-sectional shape of the inclined foundation 6, the standard components are assembled in time after excavation, the interval is 0.5-0.6 m, and longitudinal connection of welding steel bars is arranged every 0.4m in the circumferential direction, so that a strong support structure is formed, and construction safety is ensured. After the construction is finished for the first-stage support, secondary lining is not required to be constructed, an inclined foundation structure is constructed in time, and the tunnel is backfilled and excavated.
Example 2:
as shown in the attached figure 1, the light arch bridge foundation structure comprises an arch base 5, an oblique foundation 6 and a vertical foundation 7; the arch support is provided with an upper inclined plane 2, a lower inclined plane 3 and a bottom plane 4; the upper inclined plane 2 of the arch base 5 is connected with the arch springing 1 of the main arch; the lower inclined plane 3 of the arch support 5 is fixedly connected with an inclined foundation 6, and the bottom plane 4 of the arch support 5 is fixedly connected with a vertical foundation 7; the inclined foundation 6 penetrates into the rock-soil layer along the extension line direction of the axis of the arch springing 1; the vertical foundation 7 extends into the rock-soil layer along the vertical direction; the included angle between the axis of the oblique foundation 6 and the horizontal plane is equal to the included angle between the axis of the arch springing 1 and the horizontal plane; the oblique foundation 6 and the vertical foundation 7 are both constant-section solid foundations provided with reinforcement cages and rigid frameworks; the cross section of the oblique foundation 6 is arched, and the diameter of the oblique foundation is 6.0 m; the cross section of the vertical foundation 7 is circular, and the diameter of the vertical foundation is 2.0 m.
The specific construction method of the light arch bridge foundation is the same as that described in embodiment 1.
Example 3:
as shown in the attached figure 1, the light arch bridge foundation structure comprises an arch base 5, an oblique foundation 6 and a vertical foundation 7; the arch support is provided with an upper inclined plane 2, a lower inclined plane 3 and a bottom plane 4; the upper inclined plane 2 of the arch base 5 is connected with the arch springing 1 of the main arch; the lower inclined plane 3 of the arch support 5 is fixedly connected with an inclined foundation 6, and the bottom plane 4 of the arch support 5 is fixedly connected with a vertical foundation 7; the inclined foundation 6 penetrates into the rock-soil layer along the extension line direction of the axis of the arch springing 1; the vertical foundation 7 extends into the rock-soil layer along the vertical direction; the included angle between the axis of the oblique foundation 6 and the horizontal plane is equal to the included angle between the axis of the arch springing 1 and the horizontal plane; the oblique foundation 6 and the vertical foundation 7 are both constant-section solid foundations provided with reinforcement cages and rigid frameworks; the cross section of the oblique foundation 6 is circular, and the diameter of the oblique foundation is 5.25 m; the cross section of the vertical foundation 7 is circular, and the diameter of the vertical foundation is 3.5 m.
The specific construction method of the light arch bridge foundation is the same as that described in embodiment 1.
Comparative example 1:
an arch bridge foundation structure, which uses 6 vertical piles with the section diameter of 1.5m to form vertical piles instead of a single vertical foundation, is the same as the light arch bridge foundation structure described in the embodiment 1, and is constructed according to the specific construction method of the light arch bridge foundation described in the embodiment 1, and the depth of the vertical piles is the same as that of the vertical foundation described in the embodiment 1.
Taking a concrete filled steel tube arch bridge with a main span of 210m as an example, the arch bridge foundations described in the above examples 1 to 3 and comparative example 1 are applied, and midas civil finite element software is adopted to calculate the concrete consumption of each arch bridge arch seat and foundation and the unit area horizontal rigidity of the vertical foundation and the vertical pile group, and the results are shown in table 1.
TABLE 1 concrete consumption of arch bridge arch support and foundation and horizontal stiffness per unit area of vertical foundation and vertical pile group
From the above data, use in embodiment 1 ~ 3 light-duty arch bridge foundation structure can effectual reduction arch bridge hunch seat and the concrete volume of basis, and with in comparative example 1 the vertical pile group that arch bridge foundation structure used compares in addition, the horizontal rigidity of unit area of the vertical basis that uses in embodiment 1 ~ 3 has improved 1 ~ 5 times, and this description is used the utility model discloses not only can provide bigger support rigidity, reduce the basis and warp, improve the reliability and the practicality of basis, can also reduce the concrete volume of engineering, reduce engineering cost.
The present invention is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (5)
1. A light arch bridge foundation structure is characterized in that: comprises an arch support (5), an oblique foundation (6) and a vertical foundation (7); the arch seat (5) is provided with an upper inclined plane (2), a lower inclined plane (3) and a bottom plane (4); the upper inclined plane (2) of the arch base (5) is connected with an arch springing (1) of the main arch; the lower inclined plane (3) of the arch support (5) is fixedly connected with the oblique foundation (6), and the bottom plane (4) of the arch support (5) is fixedly connected with the vertical foundation (7); the inclined foundation (6) penetrates into the rock-soil layer along the extension line direction of the axis of the arch foot (1); the vertical foundation (7) extends into the rock-soil layer along the vertical direction.
2. The lightweight arch bridge infrastructure of claim 1, wherein: the included angle between the axis of the oblique foundation (6) and the horizontal plane is equal to the included angle between the axis of the arch foot (1) and the horizontal plane.
3. The lightweight arch bridge infrastructure of claim 1, wherein: the oblique foundation (6) and the vertical foundation (7) are all constant-section solid foundations provided with reinforcement cages and rigid frameworks.
4. The lightweight arch bridge infrastructure of claim 1, wherein: the cross section of the oblique foundation (6) is arched or circular, and the cross section of the vertical foundation (7) is circular.
5. A light arch bridge infrastructure according to any one of claims 1 to 4, wherein: the section diameter of the oblique foundation (6) is 1.5-3 times of that of the vertical foundation (7).
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| CN201920748879.6U CN210315186U (en) | 2019-05-23 | 2019-05-23 | Light arch bridge foundation structure |
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| CN201920748879.6U CN210315186U (en) | 2019-05-23 | 2019-05-23 | Light arch bridge foundation structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112482228A (en) * | 2020-11-20 | 2021-03-12 | 浙江省交通规划设计研究院有限公司 | Arch bridge arch foot foundation structure and construction method thereof and arch bridge |
| CN112482225A (en) * | 2020-11-16 | 2021-03-12 | 贵州路桥集团有限公司 | Arch bridge arch center excavation construction method |
| CN113235388A (en) * | 2021-05-20 | 2021-08-10 | 中交第二公路勘察设计研究院有限公司 | Flexible tied arch bridge structure with adjustable arch support rigidity |
| CN113389129A (en) * | 2021-07-28 | 2021-09-14 | 中铁二院工程集团有限责任公司 | Arch foundation structure and arch foundation construction method |
-
2019
- 2019-05-23 CN CN201920748879.6U patent/CN210315186U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112482225A (en) * | 2020-11-16 | 2021-03-12 | 贵州路桥集团有限公司 | Arch bridge arch center excavation construction method |
| CN112482225B (en) * | 2020-11-16 | 2022-08-26 | 贵州路桥集团有限公司 | Arch bridge arch center excavation construction method |
| CN112482228A (en) * | 2020-11-20 | 2021-03-12 | 浙江省交通规划设计研究院有限公司 | Arch bridge arch foot foundation structure and construction method thereof and arch bridge |
| CN113235388A (en) * | 2021-05-20 | 2021-08-10 | 中交第二公路勘察设计研究院有限公司 | Flexible tied arch bridge structure with adjustable arch support rigidity |
| CN113235388B (en) * | 2021-05-20 | 2024-02-09 | 中交第二公路勘察设计研究院有限公司 | Flexible tied arch bridge structure with adjustable arch seat rigidity |
| CN113389129A (en) * | 2021-07-28 | 2021-09-14 | 中铁二院工程集团有限责任公司 | Arch foundation structure and arch foundation construction method |
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