CN218346237U - Combined bridge foundation structure - Google Patents
Combined bridge foundation structure Download PDFInfo
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- CN218346237U CN218346237U CN202222775641.7U CN202222775641U CN218346237U CN 218346237 U CN218346237 U CN 218346237U CN 202222775641 U CN202222775641 U CN 202222775641U CN 218346237 U CN218346237 U CN 218346237U
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Abstract
The utility model relates to a bridge field, concretely relates to modular bridge foundation structure, including open cut basis and pile foundation, the pile foundation includes pile cap and pile body, the pile foundation sets up in being close to abrupt slope one side, open cut basis sets up in keeping away from abrupt slope one side, open cut basis with the shaping is pour in the lump to the pile cap. The utility model discloses the original geological conditions of make full use of sets up the open cut basis in geology more benefit, and the relatively poor department of geology adopts the pile foundation, realizes the effective combination of open cut basis and pile foundation, and the advantage of the various foundations of performance has satisfied under the prerequisite that the structure atress required, has reduced excavation and destruction to existing topography, has protected ecological environment, has that the engineering investment is economized, takes up an area of less, topography adaptability is strong, destroy characteristics such as little to the environment.
Description
Technical Field
The utility model relates to a bridge engineering technical field, especially a modular bridge foundation structure.
Background
When a bridge abutment foundation is arranged on a steep slope with a thick surface covering layer and a good foundation bearing layer, the conventional open cut foundation is economical, but in order to meet the requirement that the foundation is arranged on a stratum with a good bearing layer, the excavation depth is large, the construction risk is high, and the influence on a natural side slope is large; when the traditional pile foundation is adopted, the investment is high. In addition, at the side slope near the river, even if the geological condition of the foundation bearing stratum is better, the influence of long-term scouring of water flow easily causes the bottom of the foundation to be scoured and hollowed to influence the stress and the safety of the structure when the open cut foundation is adopted, and when the traditional retaining wall and other measures are adopted for protection, extra protection investment needs to be added, and certain influence is caused on the environment. Therefore, an economic and reasonable bridge foundation form needs to be researched by combining the topographic and geological conditions.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the steep slope section in the prior art, when an open cut foundation is adopted, when the embedding depth is not enough, the stress of the side slope foundation can not meet the requirement; when the embedding depth is enough, the problems of large foundation excavation amount, large environmental damage influence and the like can be caused; if a pile foundation is adopted, the problems of high engineering investment and the like are caused, and a combined bridge foundation structure is provided.
In order to realize the purpose, the utility model discloses a technical scheme be:
the utility model provides a modular bridge foundation structure, includes open cut basis and pile foundation, the pile foundation includes pile cap and pile body, the pile foundation sets up in being close to abrupt slope one side, open cut basis sets up in keeping away from abrupt slope one side, open cut basis with the shaping is pour in the lump to the pile cap.
As the preferred scheme of the utility model, open cut the basis with adopt the oblique angle transition between the pile cap.
As the preferred scheme of the utility model, open cut basis with the transition face between the pile cap is 45 inclined planes.
As the preferred scheme of the utility model, open cut the basis with adopt right angle transition between the pile cap.
As the preferred scheme of the utility model, open cut the basis with pile cap uniform thickness sets up.
As the preferred scheme of the utility model, open cut basis includes a plurality of foundation layers, adjacent two contained angle between the foundation layer is less than or equal to 45.
As the preferred scheme of the utility model, it is first to open cut the basis layer is less than or equal to 35 with the contained angle of mound limit.
As the preferred scheme of the utility model, the contained angle of pile body outside and mound limit is less than or equal to 45.
As the preferable scheme of the utility model, the thickness of pile cap is more than or equal to 2 times the diameter of pile shaft.
As the preferred scheme of the utility model, the pile body is apart from the distance of pile cap is more than or equal to 0.3 times the diameter of pile body.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
the utility model discloses the original geological conditions of make full use of sets up the open cut basis in geology more benefit, and the relatively poor department of geology adopts the pile foundation, realizes the effective combination of open cut basis and pile foundation, and the advantage of the various foundations of performance has satisfied under the prerequisite that the structure atress required, has reduced excavation and destruction to existing topography, has protected ecological environment, has that the engineering investment is economized, takes up an area of less, topography adaptability is strong, destroy characteristics such as little to the environment.
Drawings
Fig. 1 is a schematic structural view of a combined bridge foundation structure according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a combined bridge foundation structure according to embodiment 2 of the present invention.
Fig. 3 is a schematic structural view of a combined bridge foundation structure according to embodiment 3 of the present invention.
Fig. 4 is a schematic structural diagram of the combined bridge foundation structure according to embodiment 4 of the present invention.
Icon: 0-pier, 1-open cut foundation, 11-foundation layer, 2-pile foundation, 21-pile cap, 22-pile body, 3-steep slope edge and 4-open cut foundation edge.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1
As shown in fig. 1, a combined bridge foundation structure comprises an open cut foundation 1 and a pile foundation 2, wherein the pile foundation 2 comprises a pile cap 21 and a pile body 22, the pile foundation 2 is arranged on one side close to a steep slope, the open cut foundation 1 is arranged on one side far away from the steep slope, and the open cut foundation 1 and the pile cap 21 are cast and molded together.
When the bridge span is small (below 24 m), the pier height is short (below 10 m) and the foundation bearing capacity is high (the basic bearing capacity is more than 0.5 MPa), at the moment, in order to meet the stress requirement of the bridge foundation, the plane size of the open cut foundation 1 is arranged according to the structure, the number of the open cut foundation 1 layers is small (1-2 layers are generally adopted), but according to the topographic and geological conditions, the edge 4 of the open cut foundation is closer to the edge 3 of the steep slope, the instability of the steep slope under the natural condition is considered, and after local or integral fragmentation falls off or collapses, the stress area at the bottom of the open cut foundation 1 is influenced, so that the stress and the structure safety of the foundation are influenced, therefore, the pile foundation 2 is arranged at the side close to the steep slope, and the open cut foundation 1 and the pile foundation 2 are combined.
In order to meet the force transmission requirement of the pile foundation 2, the thickness hz of the adopted pile cap 21 needs to be slightly larger than the thickness hm of the open cut foundation 1, and C = hz-hm, S is defined 1 Is the distance between the outer pile edge and the outer pile cap edge, S 2 The distance between the inner pile edge and the edge of the inner pile cap. The pier is short and high in foundation bearing capacity, so that the pier body size and the foundation size of 0 pier are small, and the distance L between the pier edge and the pile edge is longer (S) 1 + C), adopting an oblique chamfer v for transition from the open cut foundation 1 to the pile cap 21 at the pier edge position close to the pile side, preferably, adopting a 45-degree oblique angle for transition from the pile cap 21 to the open cut foundation 1 (as shown in fig. 1). The structure is suitable for the structure with high foundation bearing capacity, small bridge span and high pier, and in the area with low earthquake intensity, the frictional resistance between the bottom of the open cut foundation and the soil layer can resist horizontal load, the pile foundation 2 mainly prevents the influence of local block falling of the slope under natural conditions on the open cut foundation, and the foundation stress is mainly borne by the open cut foundation 1.
When the open cut foundation 1 is 1 layer, the included angle a between the open cut foundation 1 and the pier edge is not more than 35 degrees, according to the stress requirement, if the number of layers of the open cut foundation 1 is more than 1 layer, namely the open cut foundation 1 comprises a plurality of foundation layers 11, the included angle b between two adjacent foundation layers 11 is not more than 45 degrees, and the included angle a between the first foundation layer 11 of the open cut foundation 1 and the pier edge is not more than 35 degrees. When the open cut foundation 1 is arranged in layers, the thickness of each layer is generally not less than 1m and generally not more than 3 layers.
As a preferred embodiment, S 1 ≥0.3d，S 2 Not less than 0.3d, and the included angle c between the outer side of the pile body 22 and the pier edge is not more than 45 degrees. The thickness hz of the pile cap 21 is more than or equal to 2d, and d is the diameter of the pile body 22.
During construction, firstly, the terrain of a bridge foundation is leveled according to the terrain and geological conditions, the pile foundation 2 is firstly constructed, after the concrete strength of the pile body 22 meets the requirement, the part (including the pile cap 21) of the open cut foundation 1 is excavated, and the open cut foundation 2 and the pile cap 21 are poured together.
Example 2
As shown in fig. 2, a combined bridge foundation structure comprises an open cut foundation 1 and a pile foundation 2, wherein the pile foundation 2 comprises a pile cap 21 and a pile body 22, the pile foundation 2 is arranged on one side close to a steep slope, the open cut foundation 1 is arranged on one side far away from the steep slope, and the open cut foundation 1 and the pile cap 21 are cast and molded together.
When the bridge span is large (bridge span is 24m, 32m and above), the pier height is high (pier height is 10 m-20 m), and the foundation bearing capacity is high (basic bearing capacity is more than 0.5 MPa), at the moment, in order to meet the stress requirement of the foundation, the plane size of the open cut foundation 1 is arranged according to the structure, the number of the open cut foundation 1 layers is small (1-2 layers are generally adopted), but according to the topographic and geological conditions, the edge 4 of the open cut foundation is closer to the edge 3 of the steep slope, the instability of the steep slope under the natural conditions is considered, the stress area at the bottom of the open cut foundation 1 is influenced after local or integral fragmentation falling or collapse, further the stress and the structural safety of the foundation are influenced, meanwhile, because the seismic intensity of the bridge site is high, in order to meet the anti-slip requirement of the foundation, the frictional resistance between the bottom of the open cut foundation 1 and the stratum cannot resist the horizontal force, therefore, the pile foundation 2 is arranged near the side, and the open cut foundation 1 and the pile 2 are combined.
Because the pile foundation 2 with a larger pile diameter is adopted because the pile foundation needs to bear larger horizontal load, and a thicker pile cap size needs to be adopted to meet the force transmission requirement of the pile foundation 2, the thickness hz of the pile cap 21 is larger than the thickness hm of the open cut foundation 1, C = hz-hm is defined, and S1 is the distance between the edge of the pile body and the edge of the pile cap. Because of the high height of the pier, the large size of the pier bottom structure, the high bearing capacity of the foundation and the size of the foundation which is only configured according to the structure, the distance L < (S) between the pier edge and the pile edge is caused 1 + C), transition from the open cut foundation 1 to the pile cap 21 at the pier edge position close to the pile side, and then transition from the open cut foundation 1 to the pile cap 21 at a right angle after reserving S1 width on the inner side of the pile. The structure adopts a combined foundation according to the topographic requirements, makes full use of geological conditions, gives full play to the stress characteristics of the pile foundation 2 and the open cut foundation 1, and meets the stress requirements of the foundation. Preferably, because the foundation thickness has sudden change, in order to satisfy the atress requirement, need the arrangement of reinforcing bar at the both sides of sudden change point.
When the open cut foundation 1 is 1 layer, the included angle a between the open cut foundation 1 and the pier edge is not more than 35 degrees, according to the stress requirement, if the number of layers of the open cut foundation 1 is more than 1 layer, namely the open cut foundation 1 comprises a plurality of foundation layers 11, the included angle b between two adjacent foundation layers 11 is not more than 45 degrees, and the included angle a between the first foundation layer 11 of the open cut foundation 1 and the pier edge is not more than 35 degrees. When the open cut foundation 1 is arranged in layers, the thickness of each layer is generally not less than 1m, and generally not more than 3 layers.
As a preferred embodiment, S 1 Not less than 0.3d, and the included angle c between the outer side of the pile body 22 and the pier edge is not more than 45 degrees. The thickness hz of the pile cap 21 is more than or equal to 2d, and d is the diameter of the pile body 22.
During construction, firstly, the terrain of a bridge foundation is leveled according to the terrain and geological conditions, the pile foundation 2 is firstly constructed, after the concrete strength of the pile body 22 meets the requirement, the part (including the pile cap 21) of the open cut foundation 1 is excavated, and the open cut foundation 2 and the pile cap 21 are poured together.
Example 3
As shown in fig. 3, a combined bridge foundation structure comprises an open cut foundation 1 and a pile foundation 2, wherein the pile foundation 2 comprises a pile cap 21 and a pile body 22, the pile foundation 2 is arranged on one side close to a steep slope, the open cut foundation 1 is arranged on one side far away from the steep slope, and the open cut foundation 1 and the pile cap 21 are cast and molded together.
When the bridge span is large (bridge span is 24m, 32m or more), the pier height is small (pier height is about 10 m), and the foundation bearing capacity is relatively small (basic bearing capacity is about 0.4 MPa), at the moment, because the upper load is large and the foundation bearing capacity is small, and the plane size of the open cut foundation 1 is arranged according to the structure, in order to meet the stress requirement of the foundation, the number of open cut foundation layers is large (generally 3 layers), but according to the topographic and geological conditions, the open cut foundation edge 4 is closer to the abrupt slope edge 3, and the instability of the abrupt slope under natural conditions is considered, the stress area of the bottom of the open cut foundation is influenced after local or integral fragmentation falls or collapses, so that the foundation stress and the safety of the structure are influenced, therefore, the pile foundation 2 is arranged on the side close to the abrupt slope, and the open cut foundation 1 is combined with the pile foundation 2.
The pile foundation 2 is mainly used for preventing the influence of local block falling of a side slope on the open cut foundation 1 under natural conditions, the foundation stress is mainly born by the open cut foundation 1, therefore, the pile diameter of the pile foundation 2 is arranged according to the minimum pile diameter required by the construction process, the thickness hz of a pile cap 21 for meeting the force transmission requirement is smaller than the thickness hm of the open cut foundation 1, the pier height is short, the size of the pier bottom is relatively small, and the side distance L between the inner side of the pile and the pier is more than or equal to S 1 ，S 1 The distance between the edge of the pile body and the edge of the pile bearing platform. In order to reduce the engineering quantity of the foundation and the foundation excavation quantity, the open cut foundation and the pile foundation bearing platform are in right-angle transition, and the open cut foundation steel bar configuration of the transition section needs to be strengthened at the moment.
The open cut foundation 1 comprises a plurality of foundation layers 11, an included angle b between every two adjacent foundation layers 11 is not more than 45 degrees, and an included angle a between the first foundation layer 11 of the open cut foundation 1 and a pier edge is not more than 35 degrees. When the open cut foundation 1 is arranged in layers, the thickness of each layer is generally not less than 1m and generally not more than 3 layers.
As a preferred embodiment, S 1 Not less than 0.3d, and the included angle c between the outer side of the pile body 22 and the pier edge is not more than 45 degrees. The thickness hz of the pile cap 21 is more than or equal to 2d, and d is the diameter of the pile body 22.
During construction, firstly, the terrain of a bridge foundation is leveled according to the terrain and geological conditions, the pile foundation 2 is firstly constructed, after the concrete strength of the pile body 22 meets the requirement, the part (including the pile cap 21) of the open cut foundation 1 is excavated, and the open cut foundation 2 and the pile cap 21 are poured together.
Example 4
As shown in fig. 4, a combined bridge foundation structure comprises an open cut foundation 1 and a pile foundation 2, wherein the pile foundation 2 comprises a pile cap 21 and a pile body 22, the pile foundation 2 is arranged on one side close to a steep slope, the open cut foundation 1 is arranged on one side far away from the steep slope, and the open cut foundation 1 and the pile cap 21 are cast and molded together.
When the bridge span is large (bridge span is 24m, 32m and above), the pier height is high (pier height is 20m and above), and the foundation bearing capacity is relatively small (basic bearing capacity is about 0.4 MPa), at this time, because the upper load is large, the foundation bearing capacity is small, and the plane size of the open cut foundation 1 is arranged according to the structure, in order to meet the stress requirement of the foundation, the number of the layers of the open cut foundation 1 is large (generally 3 layers), but according to the topographic condition, the edge 4 of the open cut foundation is close to the edge 3 of the steep slope, and considering the instability of the steep slope under the natural condition, after local or integral fragmentation falls or collapses, the stress area at the bottom of the open cut foundation 1 is influenced, so that the stress of the foundation and the safety of the structure are influenced, and simultaneously, because the earthquake intensity of the bridge site is high, in order to meet the anti-slip requirement of the foundation, the frictional resistance between the bottom of the open cut foundation 1 and the stratum can not resist the horizontal force, so that the foundation 2 is arranged at the side close to the steep slope, and the open cut foundation 1 and the pile foundation 2 are combined.
Because the pile foundation 2 needs to bear larger horizontal load, the pile foundation 2 with larger pile diameter is adopted, the pile cap 21 with thicker size needs to be adopted to meet the force transmission requirement of the pile foundation 2, and simultaneously, because the pier height is higher, the size of the pier bottom is larger, the side distance L between the inner side of the pile and the pier is less than S 1 ，S 1 The distance between the edge of the pile body and the edge of the pile bearing platform. The pile cap 21 and the open cut foundation 1 are arranged in the same thickness, and hz = hm. The scheme has the advantages that the base is straight, the construction control is convenient, meanwhile, the pile cap 21 and the open cut foundation 1 are as thick, the sudden change phenomenon does not exist in load transmission, and the stress performance is good.
The open cut foundation 1 comprises a plurality of foundation layers 11, an included angle b between every two adjacent foundation layers 11 is not more than 45 degrees, and an included angle a between the first foundation layer 11 of the open cut foundation 1 and a pier edge is not more than 35 degrees. When the open cut foundation 1 is arranged in layers, the thickness of each layer is generally not less than 1m and generally not more than 3 layers.
As a preferred embodiment, S 1 Not less than 0.3d, and the included angle c between the outer side of the pile body 22 and the pier edge is not more than 45 degrees. The thickness hz of the pile cap 21 is more than or equal to 2d, and d is the diameter of the pile body 22.
During construction, firstly, the terrain of a bridge foundation is leveled according to the terrain and geological conditions, the pile foundation 2 is constructed, after the concrete strength of a pile body 22 meets the requirement, the part (including a pile cap 21) of the open cut foundation 1 is excavated, and the open cut foundation 2 and the pile cap 21 are poured together.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a modular bridge foundation structure, its characterized in that, includes open cut basis (1) and pile foundation (2), pile foundation (2) are including pile cap (21) and pile body (22), pile foundation (2) set up in being close to abrupt slope one side, open cut basis (1) set up in keeping away from abrupt slope one side, open cut basis (1) with pile cap (21) pour the shaping in the lump.
2. A modular bridge foundation structure according to claim 1, characterised in that an oblique angle transition is used between the open cut foundation (1) and the pile cap (21).
3. A modular bridge foundation structure according to claim 2, wherein the transition surface between the open-cut foundation (1) and the pile cap (21) is a 45 ° slope.
4. A modular bridge foundation structure according to claim 1, characterised in that a right angle transition is used between the open cut foundation (1) and the pile cap (21).
5. A modular bridge foundation structure according to claim 1, characterised in that the open cut foundation (1) and the pile cap (21) are of equal thickness.
6. A modular bridge foundation structure according to claim 1, wherein said open-cut foundation (1) comprises a plurality of foundation layers (11), and the included angle between two adjacent foundation layers (11) is less than or equal to 45 °.
7. A modular bridge foundation structure according to claim 6, wherein the angle between the first foundation layer (11) of the open cut foundation (1) and the pier edge is less than or equal to 35 °.
8. A modular bridge foundation structure according to claim 1, wherein the angle between the outside of the pile body (22) and the pier edge is less than or equal to 45 °.
9. A modular bridge foundation structure according to any one of claims 1-8, wherein the thickness of the pile cap (21) is greater than or equal to 2 times the diameter of the pile shaft (22).
10. A modular bridge foundation structure according to any one of claims 1-8, wherein the distance of the pile shaft (22) from the pile cap (21) is greater than or equal to 0.3 times the diameter of the pile shaft (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222775641.7U CN218346237U (en) | 2022-10-20 | 2022-10-20 | Combined bridge foundation structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222775641.7U CN218346237U (en) | 2022-10-20 | 2022-10-20 | Combined bridge foundation structure |
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| Publication Number | Publication Date |
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| CN218346237U true CN218346237U (en) | 2023-01-20 |
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| CN202222775641.7U Active CN218346237U (en) | 2022-10-20 | 2022-10-20 | Combined bridge foundation structure |
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| CN (1) | CN218346237U (en) |
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2022
- 2022-10-20 CN CN202222775641.7U patent/CN218346237U/en active Active
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