CN212316575U - Be used for highway to expand ground processing structure - Google Patents
Be used for highway to expand ground processing structure Download PDFInfo
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- CN212316575U CN212316575U CN202020629343.5U CN202020629343U CN212316575U CN 212316575 U CN212316575 U CN 212316575U CN 202020629343 U CN202020629343 U CN 202020629343U CN 212316575 U CN212316575 U CN 212316575U
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Abstract
The utility model provides a be used for highway to expand ground processing structure relates to road expansion field, including the pile body, the cooperation of pile body top has the pile cap, the graded rubble has been laid at pile cap top, the geogrid has been laid to the inside level of graded rubble, and one side parcel that former road bed was kept away from to the graded rubble has the geotechnological cloth, forms the bearing structure of expanding the road bed jointly, squeezes into the pile body and forms composite foundation in the natural foundation to the pile body can cooperate the pile cap to carry out the support of certain degree to the graded rubble bed course of top, and graded rubble bed course can effectively completely cut off groundwater and capillary water to the influence of newly piecing together wide ground, improves the overall stability of road bed.
Description
Technical Field
The utility model relates to a road enlargement field, in particular to be used for highway to expand ground and handle structure.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
When the expressway is expanded, the problem of differential settlement of the new spliced part and the old road part exists. When the highway is widened, old road parts generally go on the bus for many years, old road part foundation is under old road bed load and the long-term effect of driving load, old road part's foundation subsides have been accomplished basically, the foundation of newly-widening part can produce great settlement under the effect of road bed load and driving load, after highway is widened and is led on the bus, new and old road foundation produces great difference and subsides, the difference of foundation subsides can reflect bituminous paving part gradually, cause new and old concatenation position road surface to produce great crack, influence driving safety when serious.
The inventor finds that the treatment measures aiming at the part of the foundation of the new road in the highway extension process mainly comprise two measures, namely, the treatment measures adopt shallow reinforcement of the foundation: on the basis of vibrating and compacting the newly-spliced wide foundation, the newly-spliced wide foundation is reinforced and compacted by adopting an impact rolling or high-speed hydraulic mode. The disadvantage of this treatment is that the reinforcement depth for the newly-spliced and widened foundation is shallow, generally within 2 m. When the height of the roadbed is higher and the load of the roadbed is larger, the problem of settlement of the foundation under the roadbed load cannot be effectively solved; the other is to adopt composite foundation, according to the geological condition of foundation, adopt aggregate pile, reinforcement soil pile, cement fly ash gravel pile to carry out ground treatment to the wide part of newly piecing together. The method has the defects that the granular pile, the reinforced soil pile and the cement fly ash gravel pile need to be formed on the construction site, the construction period is long, the time cost is high, the highway traffic guarantee requirement is high, the construction period requirement is tight, and the requirement on the highway extension period is difficult to adapt to.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the defects that prior art exists, provide a be used for highway to expand ground and handle structure, squeeze into the pile body in the natural ground, pile body, pile cap, graded broken stone bed course, geogrid and the cooperation effect jointly between the stake constitute compound ground to graded broken stone bed course can effectively completely cut off groundwater and capillary water to the influence of newly piecing together wide road bed, improves the overall stability of road bed.
In order to realize the purpose, the following technical scheme is adopted:
the utility model provides a be used for highway to expand foundation treatment structure, includes the pile body, the cooperation of pile body top has the pile cap, graded rubble has been laid at pile cap top, the geogrid has been laid to the inside level of graded rubble, and one side parcel that former road bed was kept away from to graded rubble has geotechnological cloth, forms the bearing structure of expansion road bed jointly.
Furthermore, a plurality of pile bodies are arranged at intervals along the width direction of the roadbed and at intervals along the extending direction of the road surface; the top of each pile body is respectively matched with a corresponding pile cap.
Furthermore, the sectional area of the pile cap is larger than that of the pile body, a counter bore corresponding to the end part of the pile body is arranged on one end face of the pile cap, and the end part of the pile body is installed in a matching mode with the counter bore.
Furthermore, the other end face, far away from the counter bore, of the pile cap is attached to graded broken stone, the pile body penetrates into the soil body, and the graded broken stone is supported through the pile cap above the pile body.
Furthermore, the graded broken stones are laid horizontally, one side of each graded broken stone is butted with the original roadbed, and the other side of each graded broken stone extends to the edge of the expanded roadbed in the width direction; in the extending direction of the road surface, the graded broken stones extend to two ends of the expanded roadbed.
Furthermore, one end of the geotextile is attached to the top surface of the graded broken stone, and the other end of the geotextile is attached to the bottom surface of the graded broken stone after clinging to and bypassing the end part of the graded broken stone.
Further, the geogrids are horizontally arranged inside the graded broken stones and are laid along with the graded broken stones according to the laying of the graded broken stones.
Further, the geogrid is fixed through U-shaped nails.
Further, the U-shaped nails are uniformly arranged on the geogrid.
Further, the geotextile is a reverse filter geotextile.
Compared with the prior art, the utility model has the advantages and positive effects that:
(1) the reinforced concrete precast pile is driven into the natural foundation to form a composite foundation, and the driven pile is a finished pile prefabricated in advance by a prefabrication factory, so that the construction is fast on a construction site, and the construction period can be greatly saved;
(2) on one hand, the graded broken stone cushion layer is matched with a geogrid arranged inside to jointly form a reinforced broken stone cushion layer under the action of the graded broken stone cushion layer, the reinforced broken stone cushion layer enables soil between piles and piles to jointly bear loads of an upper roadbed and an automobile, meanwhile, the loads of the upper roadbed and the automobile are properly concentrated on the piles, and the upper load acting on the soil foundation between the piles is smaller than the bearing capacity of the soil foundation between the piles; on the other hand, the graded broken stones can effectively block the influence of underground water and capillary water on the newly-spliced broad roadbed, and water permeating into the roadbed above the roadbed can be timely discharged through the graded broken stone cushion layer, so that the stability of the roadbed is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is an overall schematic view of an extension foundation treatment structure in embodiment 1 of the present disclosure;
FIG. 2 is an enlarged view of a portion of FIG. 1 at B;
fig. 3 is a schematic structural diagram of a pile cap in embodiment 1 of the present disclosure;
FIG. 4 is an enlarged view of a portion of FIG. 1 at A;
fig. 5 is a schematic diagram of the arrangement position of each pile body in embodiment 1 of the present disclosure.
In the figure, 1-precast pile, 2-pile cap, 3-geotextile, 4-graded broken stone cushion layer, 5-geogrid and 6-cylindrical pit slot.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this disclosure, if any, merely indicate that the directions of movement are consistent with those of the figures themselves, and are not limiting in structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present disclosure.
As introduced in the background art, when the foundation of the newly-spliced wide part is arranged in the prior art, the problem of subgrade load settlement cannot be effectively solved, or the construction period is long, and the requirement of the expressway for short construction period is difficult to meet.
Example 1
In an exemplary embodiment of the present disclosure, as shown in fig. 1 to 5, a foundation treatment structure for highway extension is provided.
Mainly comprises a pile body, a pile cap 2 and graded broken stones; the graded broken stones are laid horizontally, one side of the graded broken stones, which is far away from the original roadbed, is provided with a geotextile 3, and a geogrid 5 is laid inside the geotextile;
specifically, the pile body is a reinforced concrete precast pile 1, the pile cap is a reinforced concrete pile cap, the geogrid is a steel-plastic geogrid, the geotextile is a reverse filtering geotextile, and the graded broken stones are tiled to form a graded broken stone cushion layer 4;
the reinforced concrete precast pile is arranged in a foundation, the reinforced concrete pile cap is provided with a reserved cylindrical pit groove, the reinforced concrete pile cap is arranged on the reinforced concrete precast pile through the pit groove, the graded broken stone cushion layer is arranged on the reinforced concrete pile cap, the steel-plastic geogrid is arranged in the middle of the graded broken stone cushion layer, and the anti-filtering geotextile is wrapped at the end part of the broken stone cushion layer.
In actual construction, a composite foundation is formed by driving the reinforced concrete precast pile into a natural foundation, and the driven pile is a finished pile prefabricated in advance through a precast yard, so that construction is fast on a construction site, and the construction period can be greatly shortened.
The expanded roadbed is arranged in sections, one side of the expanded roadbed is butted with the original roadbed, and the other side of the expanded roadbed extends outwards to a preset expanded edge in the width direction of the road; in the extending direction of the road length, two ends respectively extend to a preset length;
when the pile bodies are arranged, a plurality of pile bodies are uniformly arranged at intervals along the width direction of the roadbed and are uniformly arranged at intervals along the extending direction of the pavement; the top of each pile body is respectively matched with a corresponding pile cap;
the sectional area of the pile cap is larger than that of the pile body, a counter bore corresponding to the end part of the pile body is arranged on one end face of the pile cap, and the end part of the pile body is installed in a matching way with the counter bore; in this embodiment, the counter bore is a cylindrical pit 6.
When graded broken stone is arranged, the sectional area of the pile cap is larger than that of the pile body, a counter bore corresponding to the end part of the pile body is arranged on one end face of the pile cap, and the end part of the pile body is installed in a matching way with the counter bore;
one end of the geotextile is attached to the top surface of the graded broken stone, and the other end of the geotextile is attached to the bottom surface of the graded broken stone after clinging to and bypassing the end part of the graded broken stone.
For the structure of the pile cap, as shown in fig. 3, the whole pile cap is a cuboid structure, and the cross sectional area of the pile cap is larger than that of the pile body, so that the counter bore formed by the pile cap can meet the requirement of matching the end part of the pile body;
the other end face of the pile cap, which is far away from the counter bore, is attached to graded broken stone, the pile body is inserted into the soil body, and the graded broken stone is supported by the pile cap above the pile body;
it can be understood that the top of the pile cap is used as an auxiliary support for supporting the graded broken stones, the bottom surfaces of the graded broken stone cushion layers are in contact with the ground, the influence of underground water and capillary water on the newly-spliced roadbed can be isolated, water permeating into the roadbed above the roadbed can be timely discharged through the graded broken stone cushion layers, and the stability of the roadbed is guaranteed.
In the embodiment, for the selection of graded broken stones, the paving thickness is 40cm, and the grading meets the following requirements:
it is to be noted in particular that: by configuring the graded broken stone cushion layer, the load on the upper part of the roadbed can be coordinated; the graded broken stone cushion layer is matched with the geogrid arranged inside to form a reinforced broken stone cushion layer under the combined action, the reinforced broken stone cushion layer enables the inter-pile soil and the piles to jointly bear the loads of the upper roadbed and the automobiles, meanwhile, the loads of the upper roadbed and the automobiles are properly concentrated on the piles, and the upper load acting on the inter-pile soil foundation is smaller than the bearing capacity of the inter-pile soil foundation.
For the geogrid, the geogrid is horizontally arranged in the graded broken stones and is laid along with the graded broken stones according to the laying of the graded broken stones; the geogrid is fixed through U-shaped nails; a plurality of U-shaped nails are uniformly arranged on the geogrid;
in this embodiment, the geogrid should meet the following index requirements:
longitudinal and transverse ultimate tensile strength is more than or equal to 100kN/m, elongation under the longitudinal and transverse ultimate tensile strength is less than 3%, ultimate separation force of connecting points is more than or equal to 500N, lap joint width is not less than 20cm when laying, in order to prevent the grid from moving in a staggered manner when compacting, U-shaped nails are adopted for fixing, the distance is 100cm, and other requirements of the steel-plastic geogrid are in accordance with the 1 st part of the highway engineering geosynthetic geogrid: steel-plastic grating (JT/T925.1-2014) and other relevant specifications.
Of course, it is understood that in the present embodiment, specification selection is also performed on other structural components, such as: the outer diameter of the reinforced concrete precast pile pipe is 40 cm; the reinforced concrete pile cap is 140cm long, 140cm wide and 30cm thick; the depth of the cylindrical pit groove is 15cm, and the diameter of the cylindrical pit groove is 41 cm;
the geogrid is arranged at a position 20cm away from the bottom of the graded broken stone cushion layer, and the steel-plastic geogrid is fixed by the U-shaped nails.
It should be noted that the specification selection is not unique, but a set of examples given in this embodiment, when selecting the specification, the specification selection needs to be calculated according to the engineering requirements and construction regulations of the extension foundation; the selection of the specification is not the key point in the embodiment, and is not described herein again.
Example 2
In another embodiment of the present disclosure, a construction method for expanding a foundation of a highway is provided, using the foundation treatment structure provided in embodiment 1.
The method comprises the following steps:
firstly, removing surface soil of a spliced wide part and surface soil of an old road side slope according to the splicing width of a roadbed, wherein the removing depth is 20 cm;
step excavation is carried out on the old road side slope, and the step width is 200 cm;
thirdly, compacting the ground surface of the spliced wide part and the excavated step by using a vibratory roller, wherein the compaction degree (heavy type) reaches 91%;
fourthly, backfilling plain soil in the pit groove formed by cleaning the surfaces of the spliced wide part and the excavated step part, and compacting the backfilled plain soil by adopting a vibratory roller to enable the compacted elevation to be level with the elevation of the natural ground;
fifthly, driving the reinforced concrete precast pile into the foundation by adopting a static pressure method or a hammering method, and enabling the pile head elevation of the reinforced concrete precast pile to be lower than the natural ground by 15cm after the pile head elevation is driven into the foundation;
sixthly, taking the center of the circle of the reinforced concrete precast pile as a square diagonal intersection point, and taking the elevation of the natural ground as a reference, and downwards excavating a foundation pit with the side length of 140cm and the depth of 30 cm;
seventhly, placing the reinforced concrete prefabricated pile cap into the foundation pit excavated in the sixth step, and enabling the cylindrical pit groove reserved in the reinforced concrete pile cap to be clamped on the pile head of the reinforced concrete prefabricated pile;
eighthly, paving a graded broken stone cushion layer with the thickness of 20cm, leveling and compacting, wherein the compaction reaches 91%;
laying steel-plastic geogrids, and fixing the steel-plastic geogrids by using U-shaped nails;
and step ten, continuously paving a graded broken stone cushion layer with the thickness of 20cm, leveling and compacting, wherein the compaction degree reaches 91%.
And finishing the treatment of the foundation.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. The utility model provides a be used for highway to expand ground and handle structure, its characterized in that, includes the pile body, the cooperation of pile body top has the pile cap, graded broken stone has been laid at pile cap top, the geogrid has been laid to the inside level of graded broken stone, and one side parcel that original road bed was kept away from to graded broken stone has geotechnological cloth, forms the bearing structure of expansion road bed jointly.
2. The foundation treatment structure for highway extension according to claim 1, wherein said pile bodies are plural, and are arranged at regular intervals in the width direction of the roadbed and at regular intervals in the extension direction of the road surface; the top of each pile body is respectively matched with a corresponding pile cap.
3. The structure for treating the expressway extension foundation of claim 1, wherein the cross-sectional area of the pile cap is larger than that of the pile body, a counter bore corresponding to the end of the pile body is formed in one end face of the pile cap, and the end of the pile body is installed in cooperation with the counter bore.
4. The structure of claim 3, wherein the other end face of the pile cap away from the counter bore is attached to graded broken stone, the pile body is inserted into the soil body, and the graded broken stone is supported by the pile cap above.
5. An extension foundation treatment structure for a highway according to claim 1 wherein said graded broken stones are laid flat, one side of which is butted against the original foundation and the other side of which is extended to the edge of the extended foundation in the width direction; in the extending direction of the road surface, the graded broken stones extend to two ends of the expanded roadbed.
6. The structure of claim 5, wherein the geotextile has one end attached to the top surface of the graded broken stones and the other end attached to the bottom surface of the graded broken stones after being closely attached to and bypassing the end portions of the graded broken stones.
7. The structure for expressway extension foundation treatment of claim 1, wherein the geogrid is horizontally laid inside the graded crushed stones, with the laying of the graded crushed stones.
8. The structure for a highway extension foundation of claim 7 wherein said geogrid is fixed by staples.
9. The structure for an extension of a highway base as recited in claim 8, wherein said staples are provided in plurality and uniformly arranged on the geogrid.
10. The structure for an extension foundation of a highway according to claim 1, wherein said geotextile is a reverse filter geotextile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020629343.5U CN212316575U (en) | 2020-04-23 | 2020-04-23 | Be used for highway to expand ground processing structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020629343.5U CN212316575U (en) | 2020-04-23 | 2020-04-23 | Be used for highway to expand ground processing structure |
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| CN212316575U true CN212316575U (en) | 2021-01-08 |
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| CN202020629343.5U Active CN212316575U (en) | 2020-04-23 | 2020-04-23 | Be used for highway to expand ground processing structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113279387A (en) * | 2021-04-02 | 2021-08-20 | 杨燕伟 | Composite foundation treatment method and application |
| WO2023029779A1 (en) * | 2021-09-03 | 2023-03-09 | 中铁上海设计院集团有限公司 | Channel revetment prefabricated capping beam |
-
2020
- 2020-04-23 CN CN202020629343.5U patent/CN212316575U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113279387A (en) * | 2021-04-02 | 2021-08-20 | 杨燕伟 | Composite foundation treatment method and application |
| WO2023029779A1 (en) * | 2021-09-03 | 2023-03-09 | 中铁上海设计院集团有限公司 | Channel revetment prefabricated capping beam |
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Address after: 250031 No. 576 Wushanxi Road, Tianqiao District, Jinan City, Shandong Province Patentee after: Shandong transportation planning and Design Institute Group Co.,Ltd. Address before: 250031 No. 576 Wushanxi Road, Tianqiao District, Jinan City, Shandong Province Patentee before: Shandong transportation planning and Design Institute Co.,Ltd. |