CN215715383U - Cushion cap foundation backfill structure - Google Patents
Cushion cap foundation backfill structure Download PDFInfo
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- CN215715383U CN215715383U CN202121288688.XU CN202121288688U CN215715383U CN 215715383 U CN215715383 U CN 215715383U CN 202121288688 U CN202121288688 U CN 202121288688U CN 215715383 U CN215715383 U CN 215715383U
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Abstract
The utility model particularly discloses a bearing platform foundation backfill structure which comprises an upper backfill layer and a lower backfill layer, wherein the lower backfill layer is filled in a fertilizer groove formed between a bearing platform side and a pipe gallery side, a steel bar mesh is arranged between the bottom of the bearing platform and the bottom of a foundation pit, a lower injection concrete layer is arranged along the outer side of the steel bar mesh, the lower backfill layer is filled in the fertilizer groove formed between the lower injection concrete layer, the bearing platform side, the pipe gallery side and the bottom of the foundation pit, and the upper backfill layer is positioned above the lower backfill layer, completely wraps the pipe gallery and the bearing platform and is filled to the top of the foundation pit. According to the utility model, plain concrete/graded gravel and plain soil backfill are combined, a reinforcing mesh is arranged between the bearing platform side and the pipe gallery side, a concrete layer is sprayed for connection, then plain concrete/graded gravel is filled in gaps between the bearing platform side and the pipe gallery side, and the upper layer is backfilled by the plain soil, so that the problem that the width of a fertilizer tank on the bearing platform side is small and the backfilling is difficult is well solved, and the structural stability of rail transit is ensured.
Description
Technical Field
The utility model belongs to the field of constructional engineering, and particularly relates to a bearing platform foundation backfill structure.
Background
According to the requirements of technical Specification of building pile foundations JGJ 94-2008: plain concrete or stirring fluid cement soil is poured into the gap between the bearing platform and the side wall of the foundation pit, or the bearing platform and the side wall of the foundation pit are tamped layer by adopting lime soil, graded sandstone and plain soil with better compactibility, and the compaction coefficient is not less than 0.94.
The existing bearing platform foundation construction backfill technology mainly comprises two technologies, namely a plain concrete backfill technology; and the other is an earthwork layered tamping technology. Because the mark section piping lane is located new airport line and highway common structure section below, the piping lane closes on common structure cushion cap side department and backfills the construction working face narrowly, because of cushion cap side fertile groove width is little, for guaranteeing track traffic structural stability. Therefore, a need exists for a method that combines the advantages of the two methods to find a better balance point between the construction period and the cost.
Disclosure of Invention
Aiming at the technical problems, the utility model provides a bearing platform foundation backfill structure.
The technical scheme adopted by the utility model is as follows:
the utility model provides a cushion cap foundation backfill structure, includes backfill layer and lower backfill layer, backfill layer fills in the fertile inslot that forms between by cushion cap side and pipe gallery side down to set up the reinforcing bar net between cushion cap bottom and the foundation ditch bottom, be provided with down along the reinforcing bar net outside and spray the concrete layer, backfill layer fills in the fertile inslot that forms between by spraying concrete layer, cushion cap side, pipe gallery side and foundation ditch bottom down, it then lies in backfill layer top and wraps up pipe gallery and cushion cap completely down to go up the backfill layer to fill to the foundation ditch top.
Preferably, the lower backfill layer is formed by pouring C15 concrete, and the height of the lower backfill layer is the elevation of the top plate of the pipe gallery.
Preferably, the lower backfill layer is composed of a plurality of layers of pouring structures, a step-shaped connecting stub part is arranged at the joint of each layer of pouring structure and the upper layer of pouring structure, the width of each layer of step surface is 1000mm, and the height of each layer of step surface is 500 mm.
Preferably, the upper backfill layer is formed by ramming plain soil in layers, and the height of the upper backfill layer is the distance from the top of the pipe gallery to the top of the foundation pit.
Preferably, the lower backfill layer is formed by layering and paving natural graded gravel, and the height of the lower backfill layer is 200mm above the bottom of the bearing platform.
Preferably, the upper backfill layer is formed by ramming plain soil in layers, and the height of the upper backfill layer is the distance from the top of the lower backfill layer to the top of the foundation pit.
Preferably, an upper spraying concrete layer is respectively arranged between the two sides of the top of the foundation pit and the tops of the bearing platforms at the two sides, and the thickness of the upper spraying concrete layer is 80 mm.
Preferably, the bottom of the foundation pit is provided with a drainage ditch and is positioned on two sides of the pipe gallery.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model designs a bearing platform foundation backfill structure, which combines plain concrete/graded gravel and plain soil backfill, wherein a reinforcing mesh is arranged between a bearing platform side and a pipe gallery side and is connected by spraying a concrete layer, then plain concrete/graded gravel is filled in gaps between the plain concrete/graded gravel, and when the plain concrete is filled, layered pouring is adopted, a stepped connecting stub part is arranged at the joint of each layer of pouring structure and an upper layer of pouring structure, the width of each layer of stepped surface is 1000mm, and the height of each layer of stepped surface is 500mm, so that the segregation phenomenon generated in the concrete pouring process is prevented, the problem that a fertilizer groove on the bearing platform side is small in width and difficult to backfill is well solved, and the structural stability of rail transit is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic view of a foundation backfill structure of a bearing platform according to an embodiment;
FIG. 2 is a schematic view of the junction of each layer of casting structure with an upper layer of casting structure;
fig. 3 is a schematic view of a foundation backfill structure of a cushion cap provided in embodiment 2.
Wherein, 1, a bearing platform; 2. a pipe gallery; 3. a lower backfill layer; 4. an upper backfill layer; 5. spraying a concrete layer on the surface; 6. a lower sprayed concrete layer; 7. a drainage ditch; 8. a reinforcing mesh; 9. a step-shaped stubble connecting part.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The utility model specifically discloses a bearing platform foundation backfill structure which comprises an upper backfill layer 4 and a lower backfill layer 3, wherein the lower backfill layer 3 is filled in a fertilizer groove formed between the side of a bearing platform 1 and the side of a pipe gallery 2, a steel bar mesh 8 is erected between the bottom of the bearing platform 1 and the bottom of a foundation pit, a lower injection concrete layer 6 is arranged along the outer side of the steel bar mesh 8, the lower backfill layer 3 is filled in the fertilizer groove formed among the lower injection concrete layer 6, the side of the bearing platform 1, the side of the pipe gallery 2 and the bottom of the foundation pit, and the upper backfill layer 4 is positioned above the lower backfill layer 3, completely wraps the pipe gallery 2 and the bearing platform 1 and is filled to the top of the foundation pit.
Wherein, lower backfill layer 3 is formed by C15 concrete placement, and its height is 2 roof elevation of pipe gallery, for protection cushion cap 1 and cushion cap 1 pile foundation simultaneously, the backfill concrete scope is that cushion cap 1 expands 2.5m from both sides respectively.
The lower backfill layer 3 is composed of a plurality of layers of pouring structures, a step-shaped stubble connecting part 9 is arranged at the joint of each layer of pouring structure and the upper layer of pouring structure, the width of each layer of step surface is 1000mm, and the height is 500 mm. Go up the backfill layer and tamp the formation by plain soil layering, its height is the distance of 2 tops of pipe gallery to foundation ditch tops.
In this embodiment, upper sprayed concrete layers 5 with a thickness of 80mm are respectively arranged between two sides of the top of the foundation pit and the tops of the bearing platforms 1 at two sides. The thickness of the lower sprayed concrete layer 6 is also 80 mm. And a drainage ditch 7 is arranged at the bottom of the foundation pit and positioned at two sides of the pipe gallery 2. The foundation pit drainage backflow is facilitated.
And a backfill structure construction step:
1. building a steel bar mesh, and spraying an upper spraying concrete layer and a lower spraying concrete layer;
2. excavating a drainage ditch;
3. backfilling the lower layer C15 concrete;
backfilled concrete is subjected to layered continuous casting, and the layered casting height is not more than 500 mm; when layered pouring is carried out, the upper layer of concrete is finished before the initial setting of the next layer of concrete, the backfilling at two sides is carried out synchronously and symmetrically, and the height difference is not more than 300 mm; the free falling height of the concrete must not exceed 2m, otherwise, the concrete is poured by a method of a cylinder string or a chute, and the segregation phenomenon in the concrete pouring process is prevented.
4. Backfilling upper plain soil;
side of bearing platform 1: and backfilling plain concrete to a designed elevation and after the strength is reached, backfilling plain soil. The non-bearing platform side is backfilled by plain soil, and the compaction coefficient is not less than 90%.
Example 2
The embodiment provides a bearing platform foundation backfill structure, which is different from the embodiment 1 in that in the embodiment, a lower backfill layer 3 is formed by layering and paving natural graded gravel, the height of the lower backfill layer is 200mm above the bottom of a bearing platform, and simultaneously, in order to protect the bearing platform 1 and a pile foundation of the bearing platform 1, the backfill graded gravel range is that the bearing platform is respectively expanded by 2.5m from two sides. The upper backfill layer 4 is formed by ramming plain soil in layers, and the height of the upper backfill layer is the distance from the top of the lower backfill layer 3 to the top of the foundation pit.
And a backfill structure construction step:
1. building a steel bar mesh, and spraying an upper spraying concrete layer and a lower spraying concrete layer;
2. excavating a drainage ditch;
3. backfilling the lower-layer graded gravel;
the backfill graded sandstone is paved in layers, the thickness of the soil paved on each layer is about 200mm, and the gravel is leveled after being paved on each layer. After each layer of backfill graded sandstone is filled, sampling according to the specification, measuring the dry density, and refilling the next layer after the dry density meets the requirement.
4. Backfilling upper plain soil;
side of bearing platform 1: and backfilling plain concrete to a designed elevation and after the strength is reached, backfilling plain soil. The non-bearing platform side is backfilled by plain soil, and the compaction coefficient is not less than 90%.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modifications, alterations and equivalent changes made to the above embodiments according to the technical essence of the present invention are still within the scope of the technical solution of the present invention.
Claims (8)
1. The utility model provides a cushion cap basis backfill structure, its characterized in that includes backfill layer and lower backfill layer, backfill layer fills in the fertile inslot that forms between by cushion cap side and pipe gallery side down to set up the reinforcing bar net between cushion cap bottom and the foundation ditch bottom, be provided with along the reinforcing bar net outside and spray the concrete layer down, backfill layer fills in the fertile inslot that forms between by spraying concrete layer, cushion cap side, pipe gallery side and the foundation ditch bottom down, it then lies in backfill layer top and wraps up pipe gallery and cushion cap completely down to go up the backfill layer to fill to the foundation ditch top.
2. The cap foundation backfill structure according to claim 1, wherein the lower backfill layer is formed by C15 concrete pouring and has a height equal to the elevation of the top plate of the pipe gallery.
3. The backfill structure for the foundation of the bearing platform according to claim 2, wherein the lower backfill layer is composed of a plurality of layers of pouring structures, each layer of pouring structure is provided with a step-shaped connecting stub part at the joint with the upper layer of pouring structure, and the width and the height of each step surface are respectively 1000mm and 500 mm.
4. The cap foundation backfill structure according to the claim 2, wherein the upper backfill layer is formed by ramming plain soil in layers, and the height of the upper backfill layer is the distance from the top of the pipe gallery to the top of the foundation pit.
5. The cushion cap foundation backfill structure according to claim 1, wherein the lower backfill layer is formed by layering natural graded gravel, and the height of the lower backfill layer is 200mm above the cushion cap bottom.
6. The cap foundation backfill structure according to claim 5, wherein the upper backfill layer is formed by ramming plain soil in layers, and the height of the upper backfill layer is the distance from the top of the lower backfill layer to the top of the foundation pit.
7. The backfill structure for the foundation of the bearing platform according to claim 1, wherein upper sprayed concrete layers with the thickness of 80mm are respectively arranged between the two sides of the top of the foundation pit and the top of the bearing platform at the two sides.
8. The cushion cap foundation backfill structure according to claim 1, wherein a drainage ditch is arranged at the bottom of the foundation pit and is positioned on two sides of the pipe gallery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121288688.XU CN215715383U (en) | 2021-06-09 | 2021-06-09 | Cushion cap foundation backfill structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121288688.XU CN215715383U (en) | 2021-06-09 | 2021-06-09 | Cushion cap foundation backfill structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215715383U true CN215715383U (en) | 2022-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121288688.XU Active CN215715383U (en) | 2021-06-09 | 2021-06-09 | Cushion cap foundation backfill structure |
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| Country | Link |
|---|---|
| CN (1) | CN215715383U (en) |
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2021
- 2021-06-09 CN CN202121288688.XU patent/CN215715383U/en active Active
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