CN215329113U - Pile-raft composite foundation based on existing concrete pavement - Google Patents
Pile-raft composite foundation based on existing concrete pavement Download PDFInfo
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- CN215329113U CN215329113U CN202120733100.0U CN202120733100U CN215329113U CN 215329113 U CN215329113 U CN 215329113U CN 202120733100 U CN202120733100 U CN 202120733100U CN 215329113 U CN215329113 U CN 215329113U
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- 239000004567 concrete Substances 0.000 title claims abstract description 77
- 239000002131 composite material Substances 0.000 title claims abstract description 31
- 238000010276 construction Methods 0.000 claims abstract description 17
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 17
- 239000002689 soil Substances 0.000 claims description 17
- 230000002457 bidirectional effect Effects 0.000 claims description 12
- 239000004575 stone Substances 0.000 claims description 8
- 230000008901 benefit Effects 0.000 abstract description 6
- 239000004576 sand Substances 0.000 abstract 2
- 239000007921 spray Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 239000002344 surface layer Substances 0.000 description 6
- 238000005507 spraying Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
本实用新型提供一种基于既有混凝土路面的桩筏复合地基，该地基包括现状混凝土路面和地基，现状混凝土路面位于地基上，且现状混凝土路面下竖直设置有若干旋喷桩，各个旋喷桩底部自由端竖直插入地基内，现状混凝土路面上表面设置有回填土，回填土内等距水平设置有双向土工格栅，旋喷桩的桩头处设置有细石混凝土，地基内位于旋喷桩一侧竖直设置有若干复合地基桩基，新建钢筋混凝土筏板与复合地基桩基顶部之间设置有砂石褥垫层，且砂石褥垫层内水平设置有双向土工格栅，新建钢筋混凝土筏板顶部设置有回填土。本实用新型不但避免了拆除既有混凝土路面和新做筏板带来的工程造价增加，而且显著的减小了施工难度，具有较好的经济效益和社会效益。
The utility model provides a pile-raft composite foundation based on an existing concrete road. The foundation includes an existing concrete road and a foundation, the existing concrete road is located on the foundation, and a plurality of rotary jet piles are vertically arranged under the existing concrete road, and each rotary jet The free end of the bottom of the pile is vertically inserted into the foundation, the upper surface of the existing concrete pavement is provided with backfill, and the backfill is provided with two-way geogrids equidistantly and horizontally. A number of composite foundation pile foundations are vertically arranged on one side of the spray pile, and a sand and gravel cushion is arranged between the newly built reinforced concrete raft and the top of the composite foundation pile foundation, and a two-way geogrid is horizontally arranged in the sand and gravel cushion. The top of the newly built reinforced concrete raft is provided with backfill. The utility model not only avoids the increase in engineering cost caused by dismantling the existing concrete pavement and the newly made raft, but also significantly reduces the construction difficulty and has good economic and social benefits.
Description
Technical Field
The utility model belongs to the technical field of foundation treatment, and particularly relates to a pile raft composite foundation based on an existing concrete pavement.
Background
The pile-raft composite foundation is a composite foundation system consisting of rigid piles, foundation soil, a cushion layer and a raft, and can coordinate the working characteristics of a pile body, the cushion layer, the raft and the foundation soil and bear upper load together. The existence of the raft plate can keep the foundation to be uniformly settled, the existence of the broken stone cushion layer can compensate the differential settlement of the pile soil, the bearing potential of the soil among the piles is fully adjusted, the load sharing of the pile soil is coordinated, and the non-uniform settlement is reduced.
The pile-raft composite foundation can solve the problem that the traditional composite foundation is difficult to solve, has wide application prospect in the field of foundation treatment, particularly in projects with strict settlement control, but has the disadvantage of relatively high manufacturing cost, and limits the application range to a certain extent.
Currently, China is in the fast promotion period of urban construction, as the land block development has time difference, the land block is used as a temporary field, a temporary road and the like before formal development in some soft foundation areas, only hardening treatment is usually carried out, deep foundation is not treated, and foundation treatment is carried out after subsequent development according to the requirement of overlying structures. If the existing concrete pavement or concrete terrace can be reasonably utilized as a raft plate of the pile raft composite foundation, the engineering waste and the construction period consumption caused by firstly breaking the concrete pavement or the concrete terrace and then carrying out foundation treatment can be avoided, the construction cost of foundation treatment can be undoubtedly reduced, the construction period can be shortened, and the remarkable economic benefit can be brought into play.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a pile-raft composite foundation based on the existing concrete pavement, which realizes the purpose of controlling the settlement of the foundation through the pile-raft composite foundation; and through the reasonable lap joint construction measure with the peripheral non-utilization area, the differential settlement which does not meet the requirements can be avoided.
In order to solve the technical problems, the utility model adopts the technical scheme that:
a pile raft composite foundation based on an existing concrete pavement comprises the existing concrete pavement and a foundation, wherein the existing concrete pavement is positioned on the foundation, a plurality of jet grouting piles are vertically arranged under the existing concrete pavement and are inserted into the foundation vertically at the free ends of the bottoms of the jet grouting piles, backfill soil is arranged on the upper surface of the existing concrete pavement, bidirectional geogrids are horizontally arranged in the backfill soil at equal intervals, fine aggregate concrete is arranged at the pile heads of the jet grouting piles, a plurality of composite foundation pile foundations are vertically arranged on one side of the jet grouting piles in the foundation, a newly-built reinforced concrete raft is arranged above the composite foundation raft, a gravel cushion layer is arranged between the newly-built reinforced concrete raft and the top of the composite foundation pile foundations, and the bidirectional geogrids are horizontally arranged in the gravel cushion layer, and the backfill soil is arranged at the top of the newly-built reinforced concrete raft.
Further, the interval between the adjacent two-way geogrids is 0.5 m.
Furthermore, the width of the lap joint between the area formed by the newly-built reinforced concrete raft and the area formed by the existing concrete pavement is at least 1 m.
Further, the width of the service area of the bidirectional geogrid exceeds the width of the service area of the existing concrete pavement by at least 2 m.
Further, the fine-stone concrete is C40 fine-stone concrete.
In the using process, a drill hole penetrates through a current concrete pavement surface layer and a foundation, the thickness of the current concrete pavement surface layer and the thickness of the foundation are determined, the availability of the current concrete pavement are evaluated, pile arrangement design of a rotary spraying pile is carried out according to a settlement control standard, then a rotary spraying pile construction process and parameters are determined according to soil conditions and reinforcement requirements, a high-pressure rotary spraying pile construction is carried out by drilling on the current concrete pavement, and at the moment, a machine is in place, a spraying pipe is injected, grouting is sprayed, a pipe is pulled out, and washing is carried out, so that pile foundation construction within a foundation treatment range is completed.
When the strength of the pile body of the jet grouting pile reaches 70%, pile heads in the current concrete pavement surface layer and foundation range are cut off, and fine aggregate concrete is filled. Preferably, the newly-built reinforced concrete raft area and the current concrete pavement area are overlapped by at least 1m in the horizontal projection direction, a layer of bidirectional geogrid is arranged in the filling area above the current concrete pavement and in the thickness of every 0.5m, and the arrangement range of the bidirectional geogrid horizontally exceeds 2m of the current concrete pavement.
Compared with the prior art, the utility model has the advantages and positive effects that:
the utility model provides a structure and a method for using the existing concrete pavement as a composite foundation raft and a differential settlement control measure with a peripheral non-utilization area, which not only avoid the increase of the construction cost caused by dismantling the existing concrete pavement and newly manufacturing the raft, but also obviously shorten the construction period, reduce the construction difficulty and have better economic benefit and social benefit; the utility model has the advantages of simple structure, convenient maintenance, low processing cost and the like.
Drawings
FIG. 1 is a schematic top view of the present invention;
FIG. 2 is a schematic cross-sectional view A-A of FIG. 1 of the present invention;
FIG. 3 is a schematic cross-sectional view B-B of FIG. 1 in accordance with the present invention;
FIG. 4 is a flow chart of a method of the present invention;
the labels in the figure are as follows:
| 1. new-built reinforced |
2. |
3. |
| 4. |
5. Composite |
6. |
| 7. |
8. Foundation | 9. Fine stone concrete |
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples without making any creative effort, shall fall within the protection scope of the present invention.
Unless otherwise defined, technical or scientific terms used in the embodiments of the present application should have the ordinary meaning as understood by those having ordinary skill in the art. The use of "first," "second," and similar terms in the present embodiments does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. "Upper," "lower," "left," "right," "lateral," "vertical," and the like are used solely in relation to the orientation of the components in the figures, and these directional terms are relative terms that are used for descriptive and clarity purposes and that can vary accordingly depending on the orientation in which the components in the figures are placed.
As shown in fig. 1, 2 and 3, the pile raft composite foundation based on the existing concrete pavement of the embodiment includes a current concrete pavement 3 and a foundation 8, the current concrete pavement 3 is located on the foundation 8, a plurality of jet grouting piles 6 are vertically arranged below the current concrete pavement 3, free ends of bottoms of the jet grouting piles 6 are vertically inserted into the foundation 8, backfill soil 7 is arranged on the upper surface of the current concrete pavement 3, bidirectional geogrids 2 are horizontally arranged in the backfill soil 7 at equal intervals, fine aggregate concrete 9 is arranged at pile heads of the jet grouting piles 6, a plurality of composite foundation piles 5 are vertically arranged on one side of the jet grouting piles 6 in the foundation 8, a newly built reinforced concrete raft 1 is arranged above the composite foundation piles 5, a gravel cushion layer 4 is arranged between the newly built reinforced concrete raft 1 and the top of the composite foundation piles 5, and the bidirectional geogrids 2 is horizontally arranged in the gravel cushion layer 4, and backfill soil 7 is arranged at the top of the newly-built reinforced concrete raft 1. The interval between adjacent two-way geogrids 2 is 0.5 m. The width of the lap joint between the area formed by the newly-built reinforced concrete raft 1 and the area formed by the existing concrete pavement 3 is at least 1 m. The width of the using area of the bidirectional geogrid 2 exceeds the width of the using area of the existing concrete pavement 3 by at least 2 m. The fine stone concrete 9 is C40 fine stone concrete.
As shown in fig. 4, the construction method of the present embodiment is performed as follows:
in the using process, a drill hole penetrates through the surface layer and the foundation 8 of the concrete pavement 3, the thickness of the surface layer and the foundation 8 of the concrete pavement 3 is determined, the availability of the concrete pavement 3 is evaluated, if the concrete pavement can be directly utilized, the next step is carried out, and if the concrete pavement cannot be directly utilized, the next step is carried out after local reinforcement is carried out.
In the embodiment, the concrete pavement is intact without slab breaking and cracking, and can be directly utilized; the concrete pavement slab breaking rate is less than 15% at present, and the number of hundred-square-meter cracks is less than 15, so that the concrete pavement slab can be utilized after being repaired; at present, the slab breaking rate of the concrete pavement is more than 15 percent, the number of hundreds of square meter cracks is more than 15, and the concrete pavement is not recommended to be utilized.
The pile arrangement design of the jet grouting pile 6 is carried out according to the settlement control standard, then the construction process and parameters of the jet grouting pile 6 are determined according to the soil condition and the reinforcement requirement, the high-pressure jet grouting pile 6 construction is carried out by drilling on the concrete pavement 3 at the present situation, at the moment, the machine is in place, the jet pipe is penetrated, the jet grouting, the pipe drawing and the flushing are carried out, and then the pile foundation construction within the foundation treatment range is completed.
When the strength of the body of the jet grouting pile 6 reaches 70%, pile heads in the range of the surface layer 3 of the concrete pavement and the foundation 8 are cut off, and fine aggregate concrete 9 is filled. Preferably, the newly-built reinforced concrete raft 1 area and the present concrete pavement 3 area overlap by at least 1m in the horizontal projection direction, a layer of bidirectional geogrid 2 is arranged in the filling area above the present concrete pavement 3 at the thickness of 0.5m, and the arrangement range of the bidirectional geogrid 2 horizontally exceeds the present concrete pavement 3 by more than 2 m.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the utility model. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (5)
1. The utility model provides a stake raft composite foundation based on existing concrete pavement which characterized in that: including current situation concrete pavement (3) and ground (8), current situation concrete pavement (3) are located on ground (8), just under current situation concrete pavement (3) vertically be provided with a plurality of jet grouting piles (6), each jet grouting pile (6) bottom free end is vertical to be inserted in ground (8), current situation concrete pavement (3) upper surface is provided with backfill soil (7), just equidistance level is provided with two-way geogrid (2) in backfill soil (7), each the pile head department of jet grouting pile (6) is provided with pea gravel concrete (9), lie in ground (8) jet grouting pile (6) one side is vertical to be provided with a plurality of composite foundation (5), be provided with new construction reinforced concrete raft (1) above composite foundation pile (5), newly build reinforced concrete raft (1) with be provided with grit bed course (4) between composite foundation (5) top, and the two-way geogrid (2) is horizontally arranged in the gravel cushion layer (4), and the backfill soil (7) is arranged at the top of the newly-built reinforced concrete raft (1).
2. The pile raft composite foundation based on an existing concrete pavement of claim 1, wherein: the interval between the adjacent two-way geogrids (2) is 0.5 m.
3. The pile raft composite foundation based on an existing concrete pavement of claim 1, wherein: the width of lap joint between the area formed by the newly-built reinforced concrete raft (1) and the area formed by the current concrete pavement (3) is at least 1 m.
4. The pile raft composite foundation based on an existing concrete pavement of claim 1, wherein: the width of the using area of the bidirectional geogrid (2) exceeds the width of the using area of the existing concrete pavement (3) by at least 2 m.
5. The pile raft composite foundation based on an existing concrete pavement of claim 1, wherein: the fine stone concrete (9) is C40 fine stone concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120733100.0U CN215329113U (en) | 2021-04-10 | 2021-04-10 | Pile-raft composite foundation based on existing concrete pavement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120733100.0U CN215329113U (en) | 2021-04-10 | 2021-04-10 | Pile-raft composite foundation based on existing concrete pavement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215329113U true CN215329113U (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120733100.0U Withdrawn - After Issue CN215329113U (en) | 2021-04-10 | 2021-04-10 | Pile-raft composite foundation based on existing concrete pavement |
Country Status (1)
| Country | Link |
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| CN (1) | CN215329113U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112962375A (en) * | 2021-04-10 | 2021-06-15 | 云南省设计院集团有限公司 | Pile-raft composite foundation based on existing concrete pavement and its construction method |
-
2021
- 2021-04-10 CN CN202120733100.0U patent/CN215329113U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112962375A (en) * | 2021-04-10 | 2021-06-15 | 云南省设计院集团有限公司 | Pile-raft composite foundation based on existing concrete pavement and its construction method |
| CN112962375B (en) * | 2021-04-10 | 2024-11-05 | 云南省设计院集团有限公司 | Pile-raft composite foundation based on existing concrete pavement and its construction method |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20211228 Effective date of abandoning: 20241105 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20211228 Effective date of abandoning: 20241105 |